© Semiconductor Components Industries, LLC, 2010
March, 2010 − Rev. 8
1Publication Order Number:
NUD4700/D
NUD4700
LED Shunt
The NUD4700 is an electronic shunt which provides a current bypass
in the case of a single LED going into open circuit. LEDs are by nature
quite fragile when subjected to transients and surge conditions. There
are also many cases where high reliability of the LED lighting must be
maintained such as headlights, lighthouses, bridges, aircraft, runways
and so forth. In these cases the low cost addition of the NUD4700 will
provide full assurance that an entire string of LEDs will not extinguish
should one LED fail. NUD4700 is also applicable to other loads where
circuit continuity is required. This device is designed to be used with
1 W LEDs (nominally 350 mA @ 3 V).
Features
•A Simple Two Terminal Device
•Automatically Resets Itself if the LED Heals Itself or is Replaced
•ON−State Voltage Typically 1 V
•OFF−State Current less than 250 mA
•This is a Pb−Free Device
Typical Applications
•LEDs where Preventive Maintenance is Non Practical
•LED Headlights
•LEDs with High Reliability Requirements
•Crowbar Protection for Open Circuit Conditions
•Overvoltage Protection for Sensitive Circuits
Device Package Shipping†
ORDERING INFORMATION
NUD4700SNT1G POWERMITE
(Pb−Free)
3000/Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
POWERMITE[
CASE 457
PLASTIC
Anode
Cathode
MARKING DIAGRAM
http://onsemi.com
M = Date Code
MNH = Device Code
G= Pb−Free Package
Control
Circuit
Anode
Cathode
Pin Description
PIN FUNCTION DESCRIPTION
Anode Positive Input Voltage to the Device
Cathode Negative Input Voltage to the Device
M
MNHG
Anode Cathode
NUD4700
http://onsemi.com
2
MAXIMUM RATINGS (Maximum ratings are those, that, if exceeded, may cause damage to the device. Electrical Characteristics are
not guaranteed over this range)
Rating Symbol Value Unit
Peak Repetitive Off State Voltage (Anode to Cathode) VDM −0.3 to 10 V
Average On−State Current, (TA = 25°C),
(Note 1)
(Note 2)
IT(AVG) 1.3
0.376
A
Thermal Resistance, Junction−to−Air
(Note 1)
(Note 2)
QJA
80
277
°C/W
Thermal Resistance, Junction−to−Lead QJL 35 °C/W
Power Dissipation (TA = 25°C)
(Note 1)
(Note 2)
PMAX 1.56
0.45
W
Operating Temperature Range TJ−40 to 150 °C
Non−Operating Temperature Range TJ150 °C
Lead Temperature, Soldering (10 Sec) TL260 °C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Mounted onto a 1“ x 1” square copper pad.
Normally this device would be mounted on the same copper heat sink and adjacent to the LED. If the LED were to go open, then the NUD4700
shunt would now dissipate the power using the same copper heat sink. Since the NUD4700 has a voltage that is nominally 30% of the LED,
then the power dissipation would be easily handled by the same heat sink as the LED.
2. Device mounted on minimum copper pad.
ELECTRICAL CHARACTERISTICS (Unless otherwise noted: TA = 25°C)
Characteristics Symbol Min Typ Max Unit
Off−State Current
(VAnode = 5 V)
ILEAK −100 250 mA
Breakdown Voltage
(IBR = 1 mA)
V(BR) 5.5 −7.5 V
Holding Current
(VAnode = 10 V, Iinitial = 100 mA)
IH−6.0 12 mA
Latching Current
(VAnode = 10 V)
IL−35 70 mA
On−State Voltage (IT = 0.350 A)
(IT = 0.750 A)
(IT = 1.0 A)
VT−
−
−
1.0
1.0
1.0
1.2
−
−
V
DYNAMIC CHARACTERISTICS
Critical Rate−of−Rise of Off State Voltage
(Vpk = Rated V(BR), TJ = 125°C, Exponential Method)
dV/dt 250 − − V/ms
NUD4700
http://onsemi.com
3
TYPICAL PERFORMANCE CURVES
(TA = 25°C unless otherwise noted)
0
5
10
15
20
25
30
35
40
−50 −25 0 25 50 75 100 125 150
TA, AMBIENT TEMPERATURE (°C)
IL, LATCHING CURRENT (mA)
Figure 1. Latching Current vs Temperature
0
1
2
3
4
5
6
−50 −25 0 25 50 75 100 125 150
TA, AMBIENT TEMPERATURE (°C)
IH, HOLDING CURRENT (mA)
Figure 2. Holding Current vs Temperature
0
50
100
150
200
250
300
350
400
450
−50 −25 0 25 50 75 100 125 150
TA, AMBIENT TEMPERATURE (°C)
IDSS, LEAKAGE CURRENT (mA)
50
60
70
80
90
100
012345
VOLTS (V)
Figure 3. Capacitance vs Voltage Figure 4. Leakage Current vs Temperature
Cd, CAPACITANCE (pF)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
−50 −25 0 25 50 75 100 125 150 175
TEMPERATURE (°C)
Figure 5. On−State Voltage vs. Temperature
VT
, ON−STATE VOLTAGE (V)
IT @ 350 mA
IT @ 1.0 mA
IT @ 750 mA
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
0.25 0.35 0.45 0.55 0.65 0.75 0.85 0.95 1.05
VT
, ON−STATE VOLTAGE (V)
IT
, ON−STATE CURRNT (A)
Figure 6. On−State Voltage vs. On−State
Current (IT) at 255C
NUD4700
http://onsemi.com
4
TYPICAL APPLICATION CIRCUIT
Figure 7. Typical Application Circuit
NUD4001
Current
Source
Control
Circuit
NUD4700
Control
Circuit
NUD4700
Control
Circuit
NUD4700
Control
Circuit
NUD4700
Control
Circuit
NUD4700
AC/DC
Converter
R1
Q1
NUD4700
http://onsemi.com
5
TYPICAL OPERATION WAVEFORMS
LED Current
NUD4700 voltage
Off state
NUD4700 voltage
ON−state
Switching event
LED being opened
NUD4700 switching
waveforms (Powermite)
Figure 8. NUD4700 Switching Waveforms
NUD4700 voltage
Off state
NUD4700 voltage
ON−state
LED Current
NUD4700 switching
waveforms (zoom in)
Switching event
LED being opened
Current overshoot
due to response time
of current source
Figure 9. Zoom in of Figure 8
NUD4700
http://onsemi.com
6
PACKAGE DIMENSIONS
POWERMITE
CASE 457−04
ISSUE E
DIM MIN MAX MIN MAX
INCHESMILLIMETERS
A1.75 2.05 0.069 0.081
B1.75 2.18 0.069 0.086
C0.85 1.15 0.033 0.045
D0.40 0.69 0.016 0.027
F0.70 1.00 0.028 0.039
H-0.05 +0.10 -0.002 +0.004
J0.10 0.25 0.004 0.010
K3.60 3.90 0.142 0.154
L0.50 0.80 0.020 0.031
R1.20 1.50 0.047 0.059
S
NOTES:
1. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A DOES NOT INCLUDE MOLD FLASH,
PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT
EXCEED 0.15 (0.006) PER SIDE.
S
B
M
0.08 (0.003) C S
T
−A−
−B−
S
J
K
−T−
H
L
J
C
D
S
B
M
0.08 (0.003) C S
T
F
PIN 1
PIN 2
R
0.50 REF 0.019 REF
2.54
0.100
0.635
0.025
1.27
0.050
2.67
0.105 0.762
0.030
ǒmm
inchesǓ
SCALE 10:1
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
SOLDERING FOOTPRINT*
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that SCILLC was negligent regarding the design or manufacture of the part. SCILLC is an Equal
Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5773−3850
NUD4700/D
LITERATURE FULFILLMENT:
Literature Distribution Center for ON Semiconductor
P.O. Box 5163, Denver, Colorado 80217 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: orderlit@onsemi.com
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
For additional information, please contact your local
Sales Representative
POWERMITE is a registered trademark of and used under a license from Microsemi Corporation.
The product described herein (NUD4700), may be covered by one or more U.S. patents. There may be other patents pending.
