March 2010 Doc ID 7472 Rev 7 1/12
12
BTA08, BTB08
T810, T835
Snubberless™, logic level and standard 8 A Triacs
Features
■On-state rms current, IT(RMS) 8 A
■Repetitive peak off-state voltage, VDRM/VRRM
600 to 800 V
■Triggering gate current, IGT (Q1) 5 to 50 mA
Description
Available either in through-hole or surface-mount
packages, the BTA08, BTB08 and T8 triac series
is suitable for general purpose AC switching. They
can be used as an ON/OFF function in
applications such as static relays, heating
regulation, induction motor starting circuits... or
for phase control operation in light dimmers,
motor speed controllers,...
The snubberless versions (BTA/BTB...W and T8
series) are specially recommended for use on
inductive loads, thanks to their high commutation
performances.
Logic level versions are designed to interface
directly with low power drivers such as
microcontrollers.
By using an internal ceramic pad, the BTA series
provides voltage insulated tab (rated at 2500
VRMS) complying with UL standards (file ref.:
E81734).
TO-220AB Insulated
(BTA08)
TO-220AB
(BTB08)
A2
A1
G
A2
A2
G
A1
A2
A2
A1
G
D2PAK
(T8-G) IPAK
(T8-H)
A2
A2
A1
G
G
A2
A1
G
A2
A2
A1
DPAK
(T8-B)
www.st.com
Characteristics BTA08, BTB08 and T8 Series
2/12 Doc ID 7472 Rev 7
1 Characteristics
Table 1. Absolute maximum ratings
Symbol Parameter Value Unit
IT(RMS) On-state rms current (full sine wave)
IPAK/D2PAK/DPAK/
TO-220AB Tc = 110 °C 8A
TO-220AB Ins. Tc = 100 °C
ITSM
Non repetitive surge peak on-state current
(full cycle, Tj initial = 25 °C)
F = 50 Hz t = 20 ms 80 A
F = 60 Hz t = 16.7 ms 84
I²tI
²t value for fusing tp = 10 ms 36 A²s
dI/dt
Critical rate of rise of on-state current IG = 2
x IGT ,
tr ≤ 100 ns
F = 120 Hz Tj = 125 °C 50 A/µs
IGM Peak gate current tp = 20 µs Tj = 125 °C 4 A
PG(AV) Average gate power dissipation Tj = 125 °C 1 W
Tstg
Tj
Storage junction temperature range
Operating junction temperature range
- 40 to + 150
- 40 to + 125 °C
Table 2. Electrical characteristics (Tj = 25 °C, unless otherwise specified)
Snubberless and logic level (3 quadrants)
Symbol Test conditions Quadrant
T8 BTA08 / BTB08
Unit
T810 T835 TW SW CW BW
IGT (1)
VD = 12 V RL = 30 Ω
I - II - III MAX. 10 35 5 10 35 50 mA
VGT I - II - III MAX. 1.3 V
VGD
VD = VDRM RL = 3.3 kΩ
Tj = 125 °C I - II - III MIN. 0.2 V
IH (2) IT = 100 mA MAX. 15 35 10 15 35 50 mA
ILIG = 1.2 IGT
I - III MAX. 25 50 10 25 50 70 mA
II 30 60 15 30 60 80
dV/dt (2) VD = 67 %VDRM gate open
Tj = 125 °C MIN. 40 400 20 40 400 1000 V/µs
(dI/dt)c
(2)
(dV/dt)c = 0.1 V/µs Tj = 125 °C
MIN.
5.4 - 3.5 5.4 - -
A/ms(dV/dt)c = 10 V/µs Tj = 125 °C 2.8 - 1.5 2.98 - -
Without snubber Tj = 125 °C - 4.5 - - 4.5 7
BTA08, BTB08 and T8 Series Characteristics
Doc ID 7472 Rev 7 3/12
S = Copper surface under tab.
Table 3. Standard (4 quadrants)
Symbol Test conditions Quadrant
BTA08 / BTB08
Unit
CB
IGT (1)
VD = 12 V, RL = 33 Ω
I - II - III
IV MAX. 25
50
50
100 mA
VGT ALL MAX. 1.3 V
VGD VD = VDRM, RL = 3.3 kΩ, Tj = 125 °C ALL MIN. 0.2 V
IH (2) IT = 500 mA MAX. 25 50 mA
ILIG = 1.2 IGT
I - III - IV MAX. 40 50 mA
II 80 100
dV/dt (2) VD = 67 %VDRM gate open Tj = 125 °C MIN. 200 400 V/µs
(dV/dt)c
(2) (dI/dt)c = 5.3 A/ms Tj = 125 °C MIN. 5 10 V/µs
Table 4. Static characteristics
Symbol Test conditions Value Unit
VTM (1) ITM = 11 A, tp = 380 µs Tj = 25 °C MAX. 1.55 V
Vt0 (2) Threshold voltage Tj = 125 °C MAX. 0.85 V
Rd (2) Dynamic resistance Tj = 125 °C MAX. 50 mΩ
IDRM
IRRM
VDRM = VRRM
Tj = 25 °C MAX. 5µA
Tj = 125 °C 1 mA
1. minimum IGT is guaranted at 5% of IGT max.
2. for both polarities of A2 referenced to A1.
Table 5. Thermal resistance
Symbol Parameter Value Unit
Rth(j-c) Junction to case (AC) IPAK / D2PAK / DPAK / TO-220AB 1.6 °C/W
TO-220AB Insulated 2.5
Rth(j-a) Junction to ambient
S = 1 cm²D2PA K 4 5
°C/W
S = 0.5 cm²DPAK 70
TO-220AB / TO-220AB Insulated 60
IPAK 100
Characteristics BTA08, BTB08 and T8 Series
4/12 Doc ID 7472 Rev 7
Figure 1. Maximum power dissipation versus
rms on-state current (full cycle)
Figure 2. On-state rms current versus case
temperature (full cycle)
P(W)
012345678
0
1
2
3
4
5
6
7
8
9
10
I (A)
T(RMS)
0 25 50 75 100 125
0
1
2
3
4
5
6
7
8
9
10
I (A)
T(RMS)
T (°C)
C
BTA
BTB / T8
Figure 3. On-state rms current versus
ambient temperature (full cycle)
Figure 4. Relative variation of thermal
impedance versus pulse
duration
0 25 50 75 100 125
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
I (A)
T(RMS)
T (°C)
C
DPAK
(S=1CM )
2
2
DPAK
(S=0.5CM )
2
printed circuit board FR4, copper thickness: 35 µm
1E-3 1E-2 1E-1 1E+0 1E+1 1E+2 5E+2
1E-3
1E-2
1E-1
1E+0
K=[Z /R
th th]
t (s)
p
Zth(j-c)
DPAK/IPAK
Zth(j-a)
TO-220AB/D PAK
2
Zth(j-a)
Figure 5. On-state characteristics
(maximum values)
Figure 6. Surge peak on-state current
versus number of cycles
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
1
10
100
I (A)
TM
V (V)
TM
T max.
V = 0.85V
R = 50 m
j
to
dΩ
T=
jT max.
j
T = 25°C
j.
1 10 100 1000
0
10
20
30
40
50
60
70
80
90
I (A)
TSM
Number of cycles
t=20ms
One cycle
Non repetitive
T initial=25°C
j
Repetitive
T =110°C
C
BTA08, BTB08 and T8 Series Characteristics
Doc ID 7472 Rev 7 5/12
Figure 7. Non-repetitive surge peak on-state
current for a sinusoidal
Figure 8. Relative variation of gate trigger
current
0.01 0.10 1.00 10.00
10
100
1000
I (A), I t (A s)
TSM 22
t (ms)
p
T initial=25°C
j
I
TSM
dI/dt limitation:
50A/µs
I t
2
pulse with width t < 10 ms and corresponding value of I t
p
2
360°
α
-40 -20 0 20 40 60 80 100 120 140
0.0
0.5
1.0
1.5
2.0
2.5
T (°C)
j
I,I,I[T] /
GTHL j
I ,I ,I [T =25°C]
GTHL j
I
GT
I
H
& I
L
holding current and latching current
versus junction temperature (typical values)
Figure 9. Relative variation of critical rate of
decrease of main current versus
(dV/dt)c (typical values)
Figure 10. Relative variation of critical rate of
decrease of main current versus
(dV/dt)c (typical values)
0.1 1.0 10.0 100.0
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
(dV/dt)c (V/µs)
(dI/dt)c [(dV/dt)c] / Specified (dI/dt)c
TW
T835/CW/BW
T810/SW
Snubberless and Logic level types
0.1 1.0 10.0 100.0
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
(dV/dt)c (V/µs)
(dI/dt)c [(dV/dt)c] / Specified (dI/dt)c
C
B
Standard types
Figure 11. Relative variation of critical rate of
decrease of main current versus
junction temperature
Figure 12. DPAK and D2PAK thermal resistance
junction to ambient versus copper
surface under tab
0 25 50 75 100 125
0
1
2
3
4
5
6
(dI/dt)c [T ] / pecified]
j
(dI/dt)c [T s
j
T (°C)
j
0 4 8 1216202428323640
0
10
20
30
40
50
60
70
80
90
100
S(cm²)
R (°C/W)
th(j-a)
DPAK
2
DPAK
printed circuit board FR4, copper thickness: 35 µm
Package information BTA08, BTB08 and T8 Series
6/12 Doc ID 7472 Rev 7
2 Package information
●Epoxy meets UL94, V0
●Lead-free packages
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 13. Footprint (dimensions in mm)
Table 6. D2PAK dimensions
Ref.
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 4.30 4.60 0.169 0.181
A1 2.49 2.69 0.098 0.106
A2 0.03 0.23 0.001 0.009
B 0.70 0.93 0.027 0.037
B2 1.25 1.40 0.048 0.055
C 0.45 0.60 0.017 0.024
C2 1.21 1.36 0.047 0.054
D 8.95 9.35 0.352 0.368
E 10.00 10.28 0.393 0.405
G 4.88 5.28 0.192 0.208
L 15.00 15.85 0.590 0.624
L2 1.27 1.40 0.050 0.055
L3 1.40 1.75 0.055 0.069
R 0.40 0.016
V2 0° 8° 0° 8°
G
L
L3
L2
B
B2
E
2mm min.
FLAT ZONE
A
C2
D
R
A2
V2
C
A1
16.90
10.30
8.90 3.70
5.08
1.30
BTA08, BTB08 and T8 Series Package information
Doc ID 7472 Rev 7 7/12
Figure 14. Footprint (dimensions in mm)
Table 7. DPAK dimensions
Ref.
Dimensions
Millimeters Inches
Min. Max. Min. Max.
A 2.20 2.40 0.086 0.094
A1 0.90 1.10 0.035 0.043
A2 0.03 0.23 0.001 0.009
B 0.64 0.90 0.025 0.035
B2 5.20 5.40 0.204 0.212
C 0.45 0.60 0.017 0.023
C2 0.48 0.60 0.018 0.023
D 6.00 6.20 0.236 0.244
E 6.40 6.60 0.251 0.259
G 4.40 4.60 0.173 0.181
H 9.35 10.10 0.368 0.397
L2 0.80 typ. 0.031 typ.
L4 0.60 1.00 0.023 0.039
V2 0° 8° 0° 8°
H
L4
G
B
L2
E
B2
D
A1
R
R
C
A
C2
0.60 MIN.
V2
A2
6.7
6.7 3 3 1.6
1.6
2.3
2.3
Package information BTA08, BTB08 and T8 Series
8/12 Doc ID 7472 Rev 7
Table 8. IPAK dimensions
Ref.
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 2.20 2.40 0.086 0.094
A1 0.90 1.10 0.035 0.043
A3 0.70 1.30 0.027 0.051
B 0.64 0.90 0.025 0.035
B2 5.20 5.40 0.204 0.212
B3 0.95 0.037
B5 0.30 0.035
C 0.45 0.60 0.017 0.023
C2 0.48 0.60 0.019 0.023
D 6 6.20 0.236 0.244
E 6.40 6.60 0.252 0.260
e2.28 0.090
G 4.40 4.60 0.173 0.181
H 16.10 0.634
L 9 9.40 0.354 0.370
L1 0.8 1.20 0.031 0.047
L2 0.80 1 0.031 0.039
V1 10° 10°
H
LL1
G
eB5
B
V1
D
C
A1
A3
A
C2
B3
L2
E
B2
BTA08, BTB08 and T8 Series Package information
Doc ID 7472 Rev 7 9/12
TO-220AB (NIns. and Ins. 20-up) dimensions
Ref.
Dimensions
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 15.20 15.90 0.598 0.625
a1 3.75 0.147
a2 13.00 14.00 0.511 0.551
B 10.00 10.40 0.393 0.409
b1 0.61 0.88 0.024 0.034
b2 1.23 1.32 0.048 0.051
C 4.40 4.60 0.173 0.181
c1 0.49 0.70 0.019 0.027
c2 2.40 2.72 0.094 0.107
e 2.40 2.70 0.094 0.106
F 6.20 6.60 0.244 0.259
ØI 3.75 3.85 0.147 0.151
I4 15.80 16.40 16.80 0.622 0.646 0.661
L 2.65 2.95 0.104 0.116
l2 1.14 1.70 0.044 0.066
l3 1.14 1.70 0.044 0.066
M2.60 0.102
C
b2
c2
F
Ø I
L
A
a1
a2
B
e
b1
I4
l3
l2
c1
M
Ordering information BTA08, BTB08 and T8 Series
10/12 Doc ID 7472 Rev 7
3 Ordering information
Figure 15. Ordering information scheme (BTA08 and BTB08 series)
Figure 16. Ordering information scheme (T8 series)
BTB: non insulated TO-220AB package
Table 9. Product Selector
Part Number
Voltage (xxx)
Sensitivity Type Package
600 V 800 V
BTA/BTB08-xxxB X X 50 mA Standard TO-220AB
BTA/BTB08-xxxBW X X 50 mA Snubberless TO-220AB
BTA/BTB08-xxxC X X 25 mA Standard TO-220AB
BTA/BTB08-xxxCW X X 35 mA Snubberless TO-220AB
BTA/BTB08-xxxSW X X 10 mA Logic level TO-220AB
BTA/BTB08-xxxTW X X 5 mA Logic Level TO-220AB
T810-xxxG X X 10 mA Logic Level D2PA K
T810-xxxH X X 10 mA Logic Level IPAK
T835-xxxB X X 35 mA Snubberless DPAK
T835-xxxG X X 35 mA Snubberless D2PA K
T835-xxxH X X 35 mA Snubberless IPAK
BT A 08 - 600 BW (RG)
Triac series
Insulation
Current
Voltage
Sensitivity and type
Packing mode
A = insulated
B = non insulated
08 = 8A
600 = 600V
800 = 800V
B = 50mA Standard BW = 50mA Snubberless
C = 25mA Standard CW = 35mA
RG = Tube
Snubberless
SW = 10mA Logic Level TW = 5mA Logic Level
T 8 10 - 600 B (-TR)
Triac series
Sensitivity
Voltage
Package
Packing mode
Current
8 = 8A
10 = 10 mA
35 = 35 mA
600 = 600 V
800 = 800 V
B = DPAK
G = D PAK
R = I PAK
Blanck = Tube
-TR = Tape and reel
2
2
H = IPAK
BTA08, BTB08 and T8 Series Ordering information
Doc ID 7472 Rev 7 11/12
4 Ordering information
xxx = voltage, yy = sensitivity, z = type
5 Revision history
Table 10. Ordering information
Order code Marking Package Weight Base qty Delivery mode
BTA/BTB08-xxxyzRG BTA/BTB08-xxxyz TO-220AB 2.3 g 50 Tube
T8yy-xxxG T8yyxx D2PAK 1.5 g 50 Tube
T8yy-xxxG-TR T8yyxx 1000 Tape and reel
T8yy-xxxB T8yyxx DPAK 0.3 g 75 Tube
T8yy-xxxB-TR T8yyxx 2500 Tape and reel
T8yy-xxxH T8yyxx IPAK 0.4 g 75 Tube
Table 11. Document revision history
Date Revision Changes
Apr-2002 5A Last update.
13-Feb-2006 6 TO-220AB delivery mode changed from bulk to tube.
ECOPACK statement added.
10-Mar-2010 7 Updated ECOPACK statement and Figure 16.
BTA08, BTB08 and T8 Series
12/12 Doc ID 7472 Rev 7
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