Teccor
®
brand Thyristors
Standard Bidirectional DIAC Trigger
HTxxx & HTMxxx & STxxx Series
Description
The HTM, HT, and ST series of bilateral trigger DIACs offer
a range of voltage characteristics from 27V to 70V. A DIAC
semiconductor is a full-wave or bidirectional Thyristor. It is
triggered from a blocking state to a conduction state for
either polarity of applied voltage whenever the amplitude of
applied voltage exceeds the breakover voltage of the DIAC.
Features & Benefits
compliant
ST Series:
(DO-214)
Schematic Symbol
junctions
bonded die attachment
selections
HTM/HT Series:
package
junction contamination
Applications
DIACs are used to trigger Triacs and SCRs in phase control
circuits for lamp dimming, universal motor speed control,
and heat control. They are used also for triggering
transistors in solid state ballast lighting controls.
Absolute Maximum Ratings
Symbol
I
TRM
T
S
T
J
P
D(AV)
Parameter
Pulse On-State Current
Storage Temperature Range
Operating Junction Temperature
Device Power Dissipation
T
A
= -40°C to +40°C
Test Conditions
Min
Max
2
1.5
(*)
Unit
A
°C
°C
mW
-40
-40
+125
+125
See Product
Selector Table
(*)Only Applies to HT-60
Notes:
1. Service Dissipation (at T
A
= -40°C to +40°C): 250mW for DO-35 and MINIMELF/SOD-80
and 300mW for DO214
2. Above +40°C, Derate: 3.6mW/°C for DO-35 and MINIMELF/SOD-80
and 3mW/°C for DO214
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
337
Revised: July 9, 2008
HTxxx & HTMxxx & STxxx Series
DIACs
120PPS, T
A
≤ 40°C
pulse width = 10 μS
Teccor
®
brand Thyristors
Standard Bidirectional DIAC Trigger
Electrical Characteristics
(T
J
= 25°C, unless otherwise specified)
Symbol
V
BO
ΔV
BO
V
BB
V
BB (DYN)
I
BO
Description
Breakover/Trigger Voltage
Breakover Voltage Symmetry
Δ Breakback Voltage
(Note 4)
Dynamic Δ Breakback Voltage
(Notes 2 & 3)
Breakover Current
Test Conditions
50/60Hz Sine Wave
+V
BO
to -V
BO
V
BO
to V
10mA
V
BO
to V
6mA(*)
120 PPS
50/60Hz Sine Wave
5
15
10
15
Min
See Product
Selector Table
Max
See Product
Selector Table
2
(Note 1)
Unit
V
V
V
V
V
μA
(*) Only Applies to HT-60
Electrical Characteristic Notes:
1. Breakover voltage symmetry as close as 1V is available from the factory for
these products.
2. See Figure 4 and Figure 5 for test circuit and waveforms.
3. Typical switching time is 900 nano-seconds measured at I
PK
(Figure 4) across a
20 Ω resistor (Figure 5). Switching time is defined as rise time of I
PK
between the
10% to 90% points
4. See V-I Characteristics
Static Characteristics - Not Applicable
Product Selector
Part Number
XX-32
XX-32A/ 5761
XX-32B/ 5761A
XX-34B
XX-35
XX-36A/ 5762
XX-36B
XX-40
XX-60
“XX” = HTM for MINIMELF
HT for DO-35
ST for DO-214
Package Availability
MINIMELF
—
—
HTM-32B
—
—
—
—
—
—
DO-35
HT-32
HT-32A
HT-32B
HT-34B
HT-35
HT-36A
HT-36B
HT-40
HT-60
DO-214
ST-32
—
ST-32B
ST-34B
ST-35
ST-36A
ST-36B
ST-40
—
MIN
27V
28V
30V
32V
30V
32V
34V
35V
56V
V
BO
MAX
37V
36V
34V
36V
40V
40V
38V
45V
70V
Thermal Resistances
Symbol
Description
Test Conditions
Maximum Lead Temperature: 85°C
R
(J-L)
Value
DO-35
DO-214
MINIMELF
DO-35
100
65*
75
278
Unit
°C/W
°C/W
°C/W
°C/W
Junction to Lead
Maximum Lead Temperature: 90°C
Maximum Lead Temperature: 87°C
R
(J-A)
Junction to Ambient
Free-Air
* Mounted on 1 cm
2
copper foil surface; two-ounce copper foil
HTxxx & HTMxxx & STxxx Series
338
Revised: July 9, 2008
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
Teccor
®
brand Thyristors
Standard Bidirectional DIAC Trigger
Figure 1: V-I Characteristics
Figure 2: Typical DIAC/Triac Full-wave Phase Control
Circuit
Resistive Load
3.3 k
Triac
200 k
120 V ac
60 Hz
G
MT2
MT1
0.1 μF
100 V
Diac
Figure 3: Repetitive Peak On-state Current vs. Pulse Duration
10
Repetitive Peak On-state Current (I
TRM
) – Amps
5.0
3.0
2.0
1.0
0.5
0.3
0.2
0.1
0.05
0.03
0.02
.01
.005
.003
.002
.001
1
PULSE REPETITION RATE = 120 pps
T
A
=
40
˚C
2
4
6 10
20
40 60 100
200
400
1000
2000
4000
10000
Safe Operating
Area
HT-60
HT-32x, -34x, -35, -36x, -40
HT-5761, -5761A, -5762
ST-32x, -34x, -35, -36x, -40
HTM-32B
Base Pulse Duration – μs
Figure 4: Normalized V
BO
Change
vs. Junction Temperature
6%
4%
2%
Figure 5: Test Circuit Waveforms
(Refer to Figure 5)
V
BO
Change -- %
0%
-2%
-4%
-6%
-8%
-40
-20
0
20
40
60
80
100
120
140
Junction Temperature (T
J
) -- °C
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
339
Revised: July 9, 2008
HTxxx & HTMxxx & STxxx Series
DIACs
Teccor
®
brand Thyristors
Standard Bidirectional DIAC Trigger
Figure 6: Circuit Used to Measure DIAC
Characteristics (Refer to Figure 4)
47 k
Figure 7: Peak Output Current vs. Triggering
Capacitance (Per Figure 5 with R
L
of 20
Ω)
300
*
D.U.T.
R
L
V
C
C
T
0.1 μF
I
L
20
1%
Peak Output Current (I
PK
) – mA
100 k
250
200
vi
De
ce)
150
ica
Typ
5
V
l (3
100
120 V rms
60 Hz
50
0
.01
.02
.03
.04
.05
.06
.07
.08
.09
.10
*
Adjust for one firing in each half cycle. D.U.T. = Diac
Triggering Capacitance (C
T
) – μF
Soldering Parameters
Reflow Condition
- Temperature Min (T
s(min)
)
Pre Heat
- Temperature Max (T
s(max)
)
- Time (min to max) (t
s
)
Average ramp up rate (Liquidus Temp
(T
L
) to peak
T
S(max)
to T
L
- Ramp-up Rate
Reflow
- Temperature (T
L
) (Liquidus)
- Time (min to max) (t
s
)
Pb – Free assembly
150°C
T
P
Temperature
Ramp-up
t
P
200°C
60 – 190 secs
5°C/second max
5°C/second max
217°C
60 – 150 seconds
260 °C
20 – 40 seconds
5°C/second max
8 minutes Max.
280°C
T
L
T
S(max)
Preheat
t
L
Ramp-do
Ramp-down
T
S(min)
t
S
25
time to peak temperature
Peak Temperature (T
P
)
Time within 5°C of actual peak
Temperature (t
p
)
Ramp-down Rate
Time 25°C to peak Temperature (T
P
)
Do not exceed
Time
HTxxx & HTMxxx & STxxx Series
340
Revised: July 9, 2008
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
Teccor
®
brand Thyristors
Standard Bidirectional DIAC Trigger
Physical Specifications
Terminal Finish
100% Matte-Tin Plated/ Pb-Free Solder
Dipped
DO-214: UL recognized epoxy meeting
flammabilty classification 94V-0.
DO-35/MINIMELF: Glass case body
DO-214: Copper Alloy
DO-35/MINIMELF: Copper Clad Iron
Reliability/Environmental Tests
Test
High Temperature
Voltage Blocking
Temperature Cycling
Specifications and Conditions
MIL-STD-750, M-1040, Cond A Applied
80% of Rated Min V
BO
(VAC-peak) @
125°C for 1008 hours
MIL-STD-750, M-1051,
100 cycles; -40°C to +150°C;
15-min dwell-time
EIA / JEDEC, JESD22-A101
1008 hours; 80% of Rated Min V
BO
(V
DC
):
85°C; 85%
rel humidity
MIL-STD-750, M-1031,1008 hours; 150°C
1008 hours; -40°C
MIL-STD-750, M-1056
10 cycles; 0°C to 100°C; 5-min dwell
time at each temperature; 10 sec (max)
transfer time between temperature
EIA / JEDEC, JESD22-A102 168 hours
(121°C at 2 ATMs) and 100% R/H
MIL-STD-750 Method 2031
ANSI/J-STD-002, category 3, Test A
MIL-STD-750, M-2036 Cond E
1 firing per 1/2 cycle, 168 hours
Body Material
Lead Material
Temperature/
Humidity
High Temp Storage
Low-Temp Storage
Thermal Shock
Design Considerations
Careful selection of the correct device for the application’s
operating parameters and environment will go a long
way toward extending the operating life of the Thyristor.
Overheating and surge currents are the main killers of
DIACs. Correct mounting, soldering, and forming of the
leads also help protect against component damage.
Autoclave
Resistance to
Solder Heat
Solderability
Lead Bend
Burn-in
Dimensions – MINIMELF / SOD-80 (MM Package)
A
C
C
Dimensions
B
Inches
Min
0.125
0.066
0.012
—
Typ
0.134
0.068
0.018
0.063
Max
0.142
0.070
0.020
—
Min
3.18
1.68
0.30
—
Millimeters
Typ
3.40
1.73
0.46
1.60
Max
3.61
1.78
0.51
—
A
B
C
E
D
.002 E-F
F
D
Dimensions – DO-35 (Y Package)
A
Dimension
A
B
B
Inches
Min
0.060
Max
0.090
0.015
0.135
0.018
1.000
0.165
0.022
Millimeters
Min
1.530
Max
2.280
0.381
3.430
0.458
25.400
4.190
0.558
(Note 1)
(Note 2)
(Note 1)
C
C
D
E
B
E
TYP.
D (TYP.)
Notes:
1. Package contour optional within dimensions A and C. Slugs, if any, shall be included
within this cylinger but shall not be subject to
the minimum limit of Dimention A.
2. Lead diameter is not controlled in this zone to allow for flash, lead finish build-up and
minor irregularities other than slugs.
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
341
Revised: July 9, 2008
HTxxx & HTMxxx & STxxx Series
DIACs
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