Features
n Superior circuit protection
n Overcurrent protection
n Blocks surges up to rated voltage limit
n High-speed performance
n Small SMT package
n RoHS compliant*
Applications
n RS-485 interfaces
n Exposed sense and data lines
n Factory automation
n Protection modules and dongles
n Process control equipment
n Test and measurement equipment
n General electronics
TBU-DF Series - TBU® High-Speed Protectors
*RoHS Directive 2015/863, Mar 31, 2015 and Annex.
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
General Information
The TBU-DF Series of Bourns® TBU® products are low capacitance dual bidirectional high-speed Electronic
Current Limiters (ECLs), constructed using MOSFET semiconductor technology, and designed to protect
against faults caused by short circuits, overvoltage transients and faults in battery cells, up to rated limits.
The TBU® high-speed protector placed in the system circuit will monitor the current with the MOSFET detec-
tion circuit triggering to provide an effective barrier behind which sensitive electronics will not be exposed to
large voltages or currents during transient events.
The TBU® device is provided in a surface mount DFN package and meets industry standard requirements
such as RoHS and Pb Free solder reow proles.
TBU
®
Device
Line 1 I/O Line 1 I/O
Line 2 I/O Line 2 I/O
3
4
1
6
Absolute Maximum Ratings (@ TA = 25 °C Unless Otherwise Noted)
Symbol Parameter Part Number Value Unit
Vimp Peak impulse voltage withstand with duration less than 10 ms TBU-DF055-xxx-WH
TBU-DF085-xxx-WH
550
850 V
Vrms Continuous A.C. RMS voltage TBU-DF055-xxx-WH
TBU-DF085-xxx-WH
250
425 V
Top Operating temperature range -55 to +125 °C
Tstg Storage temperature range -65 to +150 °C
Tamax Maximum Ambient Temperature +125 °C
*RoHS COMPLIANT
LEAD FREE
*RoHS COMPLIANT
VERSIONS
AVAILABLE
LEAD FREE
VERSIONS ARE
RoHS COMPLIANT*
Electrical Characteristics (@ TA = 25 °C Unless Otherwise Noted)
Symbol Parameter Part Number Min. Typ. Max. Unit
Itrigger Current required for the device to go from operating state to
protected state
TBU-DFxxx-050-WH
TBU-DFxxx-300-WH
TBU-DFxxx-500-WH
50
300
500
75
450
750
100
600
1000
mA
Rdevice Series resistance of
the TBU® device
Vimp = 550 V Itrigger (min.) = 50 mA
Vimp = 550 V Itrigger (min.) = 300 mA
Vimp = 550 V Itrigger (min.) = 500 mA
Vimp = 850 V Itrigger (min.) = 50 mA
Vimp = 850 V Itrigger (min.) = 300 mA
Vimp = 850 V Itrigger (min.) = 500 mA
TBU-DF055-050-WH
TBU-DF055-300-WH
TBU-DF055-500-WH
TBU-DF085-050-WH
TBU-DF085-300-WH
TBU-DF085-500-WH
12
6
5
23
15
12
26
14
13
38
26
25
Ω
Rmatch Package resistance matching of the TBU® device #1 - TBU® device #2 +0.5 Ω
tblock Time for the device to go from normal operating state to protected state 1 µs
IQCurrent through the triggered TBU® device with 50 Vdc circuit voltage 0.5 mA
Vreset Voltage below which the triggered TBU® device will transition to normal operating state 12 16 20 V
Rth(j-a) Junction to ambient - FR4 using JESD51-3 board 125 °C/W
Rth(j-a) Junction to ambient - FR4 using JESD51-7 board 50 °C/W
F5530
53802
Environmental Characteristics
Parameter Value
Moisture Sensitivity Level 1
ESD Classication (HBM) 1B
WARNING Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
TBU-DF Series - TBU® High-Speed Protectors
Reference Application
The TBU® devices are general use protectors used in a wide
variety of applications, including telecommunications, and
industrial communications. The maximum voltage rating of the
TBU® device should never be exceeded. Where necessary, an
OVP device should be employed to limit the maximum voltage. A
cost-effective protection solution combines Bourns® TBU®
protection devices with a pair of Bourns® TISP® Overvoltage
Protectors or MOVs. For band-width sensitive applications, a
Bourns® GDT may be substituted for the MOV.
The TBU® device, constructed using MOSFET semiconductor
technology, placed in the system circuit will monitor the
current with the MOSFET detection circuit triggering to provide
an effective barrier behind which sensitive electronics are not
exposed to large voltages or currents during transient events.
When operated, the TBU® device will limit the current to less
than the Itrigger value within the tblock duration. If voltage
above Vreset is continuously sustained, the TBU® device will
subsequently reduce the current to a quiescent current level
within a period of time that is dependent upon the applied
voltage.
After the surge, the TBU® device resets when the voltage
across the TBU® device falls to the Vreset level. The TBU®
device will automatically reset on lines which have no DC bias
or have DC bias below Vreset (such as unpowered signal lines).
Basic TBU Operation
TBU
®
Device
Load
Line
Side
3
4
1
6
OVP
OVP
3312 - 2 mm SMD Trimming Potentiometer
TBU-DF Series - TBU® High-Speed Protectors
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
Performance Graphs
Typical V-I Characteristics Normalized Itrigger vs. Temperature
Power Derating Curve
CURRENT
VOLTAGE
ITRIP
VRESET
3.0
2.5
2.0
1.5
1.0
0.5
0.0
25 45 65 85 105 125 145
Junction Temperature (°C)
-55 -35 -15 525456585 105 125
Temperature (°C)
Total Maximum Power (W)
2.5
2.0
1.5
1.0
0.5
0.0
Normalized Resistance
Multilayer JESD51-7 (2 TBU® HSPs)
Single Layer (2 TBU® HSPs)
Multilayer JESD51-7 (1 TBU® HSP)
Single Layer (1 TBU® HSP)
1.4
1.2
1.6
1.8
1.0
0.8
0.6
0.4
0.2
0.0
-55 -35 -15 525456585 105
125
Temperature (°C)
Normalized ITrigger
TYPICAL TRIGGER CURRENT
Normalized Resistance vs. Temperature
Product Dimensions
DIMENSIONS: MM
(INCHES)
CHAMFERED
CORNER
FOR PIN 1
IDENTIFICATION
0.25 ± 0.25
(.010 ± .010)
PIN 1 INDICATOR
TOP VIEW
SIDE VIEW 1
A
BDK
456
321
G
J
L
FI
H
XXXXX
YWWLL
E
C
SIDE VIEW 2
Dim. Min. Nom. Max.
A5.40
(.213)
5.50
(.217)
5.60
(.220)
B6.40
(.252)
6.50
(.256)
6.60
(.260)
C0.80
(.031)
0.90
(.035)
1.00
(.039)
D0.00
(.000) -- 0.05
(.002)
E0.20 REF.
(.008) .......F
F1.90
(.075)
2.00
(.079)
2.10
(.083)
G1.75
(.069)
1.85
(.073)
1.95
(.077)
H0.65
(.026)
0.70
(.028)
0.75
(.030)
I0.70
(.028)
0.80
(.031)
0.90
(.035)
J0.30
(.012)
0.35
(.014)
0.40
(.016)
K0.25
(.010)
0.30
(.012)
0.35
(.014)
L0.75
(.030)
0.80
(.031)
0.85
(.033)
Pad # Pin Out
1 Line 1 In/Out
2 NU (Not Used)
3 Line 1 In/Out
4L Line 2 In/Outt
5 NU (Not Used)
6 Line 2 In/Out
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
TBU-DF Series - TBU® High-Speed Protectors
NOTES:
1. Pin 1 Indicator is laser marked; radius and location within the
Pin 1 terminal.
Pin 1 dot size: 0.500 ± 0.125 mm / (.020 ± .005 in.).
2. Pin 2 and 5 are NU (Not Used) and must be left unconnected;
do not connect to In/Out lines, do not connect to system Ground.
3. Coplanarity on exposed pads shall not exceed 0.08 mm / (.003 in.).
4. Warpage shall not exceed 0.10 mm / (.004 in.) on all surfaces.
5. Exposed tie bars at package side are not plated.
TBU-DF Series - TBU® High-Speed Protectors
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
Recommended Pad Layout
Dark grey areas show added PCB copper area for better
thermal resistance.
TBU® High-Speed Protectors have a 100 % matte-tin termination
nish. For improved thermal dissipation, the recommended layout
uses PCB copper areas which extend beyond the exposed solder
pad. The exposed solder pads should be dened by a solder mask
which matches the pad layout of the TBU® device in size and spac-
ing. It is recommended that they should be the same dimension as
the TBU® pads but if smaller solder pads are used, they should be
centered on the TBU® package terminal pads and not more than
0.10-0.12 mm (0.004-0.005 in.) smaller in overall width or length.
Solder pad areas should not be larger than the TBU® pad sizes
to ensure adequate clearance is maintained. The recommended
stencil thickness is 0.10-0.12 mm (0.004-0.005 in.) with a stencil
opening size 0.025 mm (0.0010 in.) less than the solder pad size.
Extended copper areas beyond the solder pad signicantly improve
the junction to ambient thermal resistance, resulting in operation
at lower junction temperatures with a corresponding benet of reli-
ability. All pads should soldered to the PCB, including pads marked
as NC or NU but no electrical connection should be made to these
pads. Care should be taken to assure no resistive path exists
between the NC or NU pins to any other point to avoid
unexpected performance issues. For minimum parasitic
capacitance, it is recommended that signal, ground or power
signals are not routed beneath any pad. For minimum parasitic
capacitance, it is recommended that signal, ground or power
signals are not routed beneath any pad.
45
6
32
1
Reow Prole
321
3.55
(.140)
0.70
(.028)
1.15
(.045)
2.625
(.103)
PIN 1
TOP VIEW SIDE VIEW BOTTOM VIEW
A
D
BE
C
JJ
N
N
H
E
K
K
F
Prole Feature Pb-Free Assembly
Average Ramp-Up Rate (Tsmax to Tp) 3 °C/sec. max.
Preheat
- Temperature Min. (Tsmin)
- Temperature Max. (Tsmax)
- Time (tsmin to tsmax)
150 °C
200 °C
60-180 sec.
Time maintained above:
- Temperature (TL)
- Time (tL)
217 °C
60-150 sec.
Peak/Classication Temperature (Tp) 260 °C
Time within 5 °C of Actual Peak Temp. (tp) 20-40 sec.
Ramp-Down Rate 6 °C/sec. max.
Time 25 °C to Peak Temperature 8 min. max.
Typical Part MarkingHow to Order
TBU - DF xxx - yyy - WH
TBU® Product
Series
DF = Dual Bidirectional Series
Impulse Voltage Rating
055 = 550 V
085 = 850 V
Trigger Current
050 = 50 mA
300 = 300 mA
500 = 500 mA
Hold to Trip Ratio Sufx
W = Hold to Trip Ratio
Package Sufx
H = DFN Package
MANUFACTURER’S
TRADEMARK
5 DIGIT PRODUCT CODE:
• 1ST ALPHA CHARACTER INDICATES PRODUCT FAMILY:
F = TBU-DF SERIES
• 2ND & 3RD DIGITS INDICATE IMPULSE VOLTAGE.
• 4TH & 5TH DIGITS INDICATE TRIGGER CURRENT.
MANUFACTURING
DATE CODE:
• 1ST DIGIT INDICATES THE YEAR.
• 2ND & 3RD DIGITS INDICATE THE WEEK NUMBER.
• 4TH & 5TH DIGITS INDICATE LOT CODE.
PIN 1 INDICATOR
XXXXX
YWWLL
TBU-DF Series - TBU® High-Speed Protectors
REV. 09/19
“TBU” is a registered trademark of Bourns, Inc. in the United States and other countries, except Japan. All references to TBU® in this document for use in Japan shall be deemed to be
replaced with Bourns® TBU™.
Specifications are subject to change without notice.
Users should verify actual device performance in their specific applications.
The products described herein and this document are subject to specific legal disclaimers as set forth on the last page of this document, and at www.bourns.com/docs/legal/disclaimer.pdf.
Packaging Specications
B
A
DC
NF
G (MEASURED AT HUB)
USER DIRECTION OF FEED
K0
B0
P2
D1EMBOSSMENT
tD
P0
TOP
COVER
TAPE
E
W
P
A0
XXXXX
YWWLL
R
QUANTITY: 3000 PIECES PER REEL
DIMENSIONS: MM
(INCHES)
A B C D G N
Min. Max. Min. Max. Min. Max. Min. Max. Ref. Ref.
328.5
(12.93)
331
(13.05)
2.0
(0.079)
2.4
(0.094)
12.8
(0.504)
13.5
(.531)
17.0
(0.669)
17.4
(0.690)
16.5
(0.650)
100 ± 1.5
(3.94 ± 0.059)
A0 B0 D0 D1 E F
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. max.
5.75
(0.224)
5.95
(0.234)
6.75
(0.266)
6.95
(0.274)
1.5
(0.059)
1.6
(0.063)
1.5
(0.059) -1.65
(0.065)
1.85
(0.073)
7.4
(0.291)
7.6
(0.299)
K0P P0 P2 R t
Min. Max. Min. Max. Min. Max. Min. Max. Min. Max. Min. Max.
1.05
(0.041)
1.25
(0.049)
7.9
(0.311)
8.1
(0.319)
3.9
(0.159)
4.1
(0.161)
1.9
(0.075)
2.1
(0.083)
0
(0)
0.5
(.020)
0.25
(0.010)
0.35
(0.014)
W
Min. Max.
15.7
(0.618)
16.3
(0.642)
Legal Disclaimer Notice
This legal disclaimer applies to purchasers and users of Bourns® products manufactured by or on behalf of Bourns, Inc. and
its aliates (collectively, “Bourns”).
Unless otherwise expressly indicated in writing, Bourns® products and data sheets relating thereto are subject to change
without notice. Users should check for and obtain the latest relevant information and verify that such information is current
and complete before placing orders for Bourns® products.
The characteristics and parameters of a Bourns® product set forth in its data sheet are based on laboratory conditions, and
statements regarding the suitability of products for certain types of applications are based on Bourns’ knowledge of typical
requirements in generic applications. The characteristics and parameters of a Bourns® product in a user application may vary
from the data sheet characteristics and parameters due to (i) the combination of the Bourns® product with other components
in the user’s application, or (ii) the environment of the user application itself. The characteristics and parameters of a Bourns®
product also can and do vary in dierent applications and actual performance may vary over time. Users should always verify
the actual performance of the Bourns® product in their specic devices and applications, and make their own independent
judgments regarding the amount of additional test margin to design into their device or application to compensate for
dierences between laboratory and real world conditions.
Unless Bourns has explicitly designated an individual Bourns® product as meeting the requirements of a particular industry
standard (e.g., ISO/TS 16949) or a particular qualication (e.g., UL listed or recognized), Bourns is not responsible for any
failure of an individual Bourns® product to meet the requirements of such industry standard or particular qualication. Users
of Bourns® products are responsible for ensuring compliance with safety-related requirements and standards applicable to
their devices or applications.
Bourns® products are not recommended, authorized or intended for use in nuclear, lifesaving, life-critical or life-sustaining
applications, nor in any other applications where failure or malfunction may result in personal injury, death, or severe property
or environmental damage. Unless expressly and specically approved in writing by two authorized Bourns representatives
on a case-by-case basis, use of any Bourns® products in such unauthorized applications might not be safe and thus is at
the user’s sole risk. Life-critical applications include devices identied by the U.S. Food and Drug Administration as Class III
devices and generally equivalent classications outside of the United States.
Bourns expressly identies those Bourns® standard products that are suitable for use in automotive applications on such
products’ data sheets in the section entitled “Applications.” Unless expressly and specically approved in writing by two
authorized Bourns representatives on a case-by-case basis, use of any other Bourns® standard products in an automotive
application might not be safe and thus is not recommended, authorized or intended and is at the user’s sole risk. If Bourns
expressly identies a sub-category of automotive application in the data sheet for its standard products (such as infotainment
or lighting), such identication means that Bourns has reviewed its standard product and has determined that if such Bourns®
standard product is considered for potential use in automotive applications, it should only be used in such sub-category of
automotive applications. Any reference to Bourns® standard product in the data sheet as compliant with the AEC-Q standard
or “automotive grade” does not by itself mean that Bourns has approved such product for use in an automotive application.
Bourns® standard products are not tested to comply with United States Federal Aviation Administration standards generally
or any other generally equivalent governmental organization standard applicable to products designed or manufactured for
use in aircraft or space applications. Bourns expressly identies Bourns® standard products that are suitable for use in aircraft
or space applications on such products’ data sheets in the section entitled “Applications.” Unless expressly and specically
approved in writing by two authorized Bourns representatives on a case-by-case basis, use of any other Bourns® standard
product in an aircraft or space application might not be safe and thus is not recommended, authorized or intended and is at
the user’s sole risk.
The use and level of testing applicable to Bourns® custom products shall be negotiated on a case-by-case basis by Bourns
and the user for which such Bourns® custom products are specially designed. Absent a written agreement between Bourns
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also apply to such Bourns® custom products.
Users shall not sell, transfer, export or re-export any Bourns® products or technology for use in activities which involve the
design, development, production, use or stockpiling of nuclear, chemical or biological weapons or missiles, nor shall they use
Bourns® products or technology in any facility which engages in activities relating to such devices. The foregoing restrictions
apply to all uses and applications that violate national or international prohibitions, including embargos or international
regulations. Further, Bourns® products and Bourns technology and technical data may not under any circumstance be
exported or re-exported to countries subject to international sanctions or embargoes. Bourns® products may not, without
prior authorization from Bourns and/or the U.S. Government, be resold, transferred, or re-exported to any party not eligible
to receive U.S. commodities, software, and technical data.
To the maximum extent permitted by applicable law, Bourns disclaims (i) any and all liability for special, punitive, consequential,
incidental or indirect damages or lost revenues or lost prots, and (ii) any and all implied warranties, including implied warranties
of tness for particular purpose, non-infringement and merchantability.
For your convenience, copies of this Legal Disclaimer Notice with German, Spanish, Japanese, Traditional Chinese and Simplied Chinese
bilingual versions are available at:
Web Page: http://www.bourns.com/legal/disclaimers-terms-and-policies
PDF: http://www.bourns.com/docs/Legal/disclaimer.pdf
C1753 05/17/18R