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Features
■ IT(RMS) = 20 A ■ VDRM, VRRM = 600 and 700 V ■ IGT (Q1) (max) = 35 and 50 mA
Description
The WTA20 Triacs use high performance glass passivated chip technology. The Snubberless concept offers suppression of the RC network and is suitable for applications such as phase control and static switching on inductive or resistive load. Thanks to their clip assembly technique, the WTA20 Triacs provide a superior performance in surge current handling capabilities. By using an internal ceramic pad, the WTA series provides voltage insulated tab (rated at 2500Vrms)
WTA20
20A Triacs
Datasheet production data
A2
G A1
A1 A2 G
TO-220AB Insulated
TM: Snubberless is a trademark of STMicroelectronics.
This is information on a product in full production.
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Characteristics
1 Characteristics
WTA20
Table 1. Symbol
Absolute maximum ratings Parameter
Value
Unit
IT(RMS)
ITSM I²t
dI/dt
VDSM, VRSM IGM VGM PG(AV) Tstg
Tj
On-state rms current (full sine wave)
Tc = 70 °C
20
A
Non repetitive surge peak on-state current (full cycle, Tj initial = 25°C)
F = 50 Hz F = 60 Hz
t = 10 ms t = 8.3 ms
210 200
A
I²t Value for fusing
tp = 10 ms
200 A²s
Repetitive Critical rate of rise of on-state current F = 50 Hz IG = 2 x IGT, tr 100 ns
Tj = 125 °C
50
A/µs
Non repetitive
100
Non repetitive peak off-state voltage tp = 10 ms
Tj = 25 °C
VDSM/VRSM + 100
V
Peak gate current Peak positive gate voltage Average gate power dissipation
tp = 20 µs tp = 20 µs
Storage junction temperature range
Operating junction temperature range
Tj = 125 °C
4 16
Tj = 125 °C
1
- 40 to + 150
- 40 to + 125
A V W
°C
Table 2. Symbol
Electrical characteristics (Tj = 25 °C, unless otherwise specified)
Test conditions
Quadrant
WTA20 BW CW
Unit
IGT (1)
VGT VGD IH (2)
VD = 12 V, RL = 33
VD = VDRM, RL = 3.3 kTj = 125 °C IT = 500 mA, gate open
IL IG = 1.2 IGT
dV/dt (2) VD = 67% VDRM, gate open (dV/dt)c (2) (dI/dt)c = 20 A/ms
ALL ALL ALL
I - III II
I - II - III Tj = 125 °C
Tj = 125 °C
Min. Max. Max. Min. Max.
Typ.
Max. Typ. Min. Typ. Min.
21 50 35
1.5 0.2 75 50 50 90 - 80 750 500 500 250 36 22 18 11
mA V V mA
mA
V/µs
V/µs
1. Minimum IGT is guaranteed at 5% of IGT max. 2. For both polarities of A2 referenced to A1.
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WTA20
Characteristics
Table 3. Static characteristics
Symbol
VTM (1) ITM = 28 A, tp = 380 µs
IDRM IRRM
VDRM = VRRM
1. For both polarities of A2 referenced to A1.
Table 4. Thermal resistances Symbol
Rth(j-c) Rth(j-c) Rth(j-a)
Junction to case for AC Junction to case for DC Junction to ambient
Parameter Tj = 125 °C Tj = 125 °C Tj = 125 °C
Parameter
Max. Max.
Value 1.70 10
3
Unit V µA mA
Value 2.1 2.8 60
Unit °C/W
Figure 1.
Maximum power dissipation versus Figure 2. on-state rms current (full cycle)
Correlation between maximum rms power dissipation and maximum allowable temperatures
P(W)
30
25
20
15
10 α = 60° α = 30°
5
0 05
α = 180°
α = 120° α = 90°
IT(RMS)(A)
10
180°
α α
15
P(W)
30
25
20
Rth = 0°C/W Rth = 0.5°C/W
Tcase(°C)
65 75
85
15 Rth = 1.5°C/W 10 Rth = 1°C/W
95 105
5 (Tamb and Tcase) for different thermal
resistances heatsink + contact
Tamb(°C)
0
20 0
20 40 60 80 100 120
115 125
Figure 3. On-state rms current versus case Figure 4. Relative variation of thermal
temperature (full cycle)
impedance versus pulse duration
IT(RMS)(A)
25
20
α = 180°
K=[Zth/Rth]
1
Zth(j-c)
15
10 0.1
5
TC(°C)
0 0 10 20 30 40 50 60 70 80 90 100 110 120 130 0.01 1.E-3
1.E-2
Zth(j-a)
1.E-1
tp(s)
1.E+0
1.E+1
1.E+2 5.E+2
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Characteristics
WTA20
Figure 5. On-state characteristics (maximum values)
ITM(A)
1000
Tj max. Vt0 = 1.04V Rd = 20 mΩ
100
Tj = Tj max.
10 Tj = 25°C.
VTM(V)
1 1 234
Figure 6. Non repetitive surge peak on-state current versus number of cycles
ITSM(A)
1000
Non repetitive Tj initial=25°C
t=20ms One cycle
100 51
Number of cycles
10 100
1000
Figure 7.
Non repetitive surge peak on-state Figure 8.
current for a sinusoidal pulse and corresponding value of I2t
Relative variation of gate trigger current and holding current versus junction temperature
ITSM(A), I2t (A2s)
1000
pulse width t ≤ 10 ms
100 0.01
ITSM
I2t
tp(ms)
0.10
1.00
Tj initial=25°C
IGT,IH,IL[Tj] / IGT,IH,IL[Tj=25°C]
2.5
2.0
1.5 IGT
1.0 IH & IL
10.00
0.5
Tj(°C)
0.0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
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WTA20
2 Ordering information scheme
Ordering information scheme
Figure 9. Ordering information scheme
WT A 20 - 600 BW RG
Triac series Insulation A = insulated Current 20 = 20A Voltage 600 = 600V 800 = 800V Sensitivity and type BW = 50mA (max.) CW = 35mA (max) Packing mode RG = Tube
Table 5. Product selector
Order code
Voltage
600 V
700 V
WTA20-600CWRG
X
WTA20-800BWRG
X
WTA20-800CWRG
X
Sensitivity
Type
Package
35 mA 50 mA 35 mA
3 quadrants TO-220AB Ins.
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Package information
WTA20
3 Package information
Table 6.
I4 l3 l2
TO-220AB dimensions
Dimensions
Ref. Millimeters
Inches
B ØI
L A
a1 a2
b1 e
Mi.