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SM6A27 TRANSIENT SUPPRESSOR
SURFACE MOUNT AUTOMOTIVE TRANSIENT VOLTAGE SUPPRESSOR
Zener Voltage - 27.0 Volts
* ED
DO-218
0.628(16.0) 0.592(15.0) 0.539(13.7) 0.524(13.3)
Peak Pulse Current - 90.0 Amps FEATURES
Ideally suited for load dump protection Plastic package has Underwriters Laboratory Flammability Classification 94V-0 High temperature stability due to unique oxide passivation Exclusive patented PAR oxide passivated chip construction Integrally molded heatsink provides a very low thermal resistance for maximum heat dissipation Low leakage current at TJ=175C Low forward voltage drop High temperature soldering guaranteed: 260C for 10 seconds at terminals
T PA
EN
T
0.116(3.0) 0.093(2.4)
0.413(10.5) 0.342(8.7) 0.374(9.5) 0.327(8.3)
0.366(9.3) 0.343(8.7) 0.406(10.3) 0.382(9.7)
LEAD 1 0.197(5.0) 0.185(4.7) 0.028(0.7) 0.020(0.5) 0.098(2.5) 0.059(1.5)
0.138(3.5) 0.098(2.5)
MECHANICAL DATA
LEAD 2/METAL HEATSINK
0.028(0.7) 0.012(0.3)
*Patent #Os, 4,980,315,
5,166,769, 5,278,095
Dimensions in inches and (millimeters)
Case: Molded plastic body, surface mount with heatsink integrally mounted in the encapsulation Terminals: Plated, solderable per MIL-STD-750, Method 2026 Polarity: Heatsink is anode Mounting Position: Any Weight: 0.091 ounce, 2.58 grams
MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS
Ratings at 25C ambient temperature unless otherwise specified. SYMBOLS SM6A27 UNITS
Steady state power dissipation Non-repetitive peak reverse surge current for 10ms/10ms exponentially decaying waveform Maximum working peak stand-off voltage Minimum reverse zener voltage at 10mA Maximum reverse zener voltage at 10mA Maximum zener voltage temperature coefficient at IZ=10mA Peak forward surge current, 8.3ms single half sine-wave Maximum clamping voltage for 10ms/10ms exponentially decaying waveform at IPP=65A Maximum instantaneous forward voltage at 6.0A (NOTE 1) Maximum reverse leakage current at rated VWM Maximum thermal resistance junction to case Operating junction and storage temperature range
NOTE: (1) Measured on a 300ms square pulse width NOTICE: Advanced product information is subject to change without notice
PD IRSM VWM VZ VZ VZTC IFSM VC VF IR RQJC TJ, TSTG
6.0 90.0 22.0 24.0 30.0 36.0 600.0 40.0 0.99 0.5 20.0 0.95 -55 to +175
Watts Amps Volts Volts Volts mV/C Amps Volts Volts mA C/W C
TJ=25C TJ=175C
2/23/99
RATINGS AND CHARACTERISTIC CURVES SM6A27
FIG. 1 - POWER DERATING CURVE
INSTANTANEOUS FORWARD CURRENT, AMPS
FIG. 2 - TYPICAL INSTANTANEOUS FORWARD CHARACTERISTICS
8.0
POWER DISSIPATION, WATTS
100
175C 25C
7.0 6.0 5.0 4.0 3.0 2.0 1.0 0 0 25 50 75 100 125 150 175 200
10
1
0.1
0.01 0.35
0.45
CASE TEMPERATURE, C
FIG. 3 - PULSE WAVEFORM
0.85 0.75 0.65 0.55 FORWARD VOLTAGE, VOLTS
FIG. 4 - REVERSE POWER CAPABILITY
0.95
150
INPUT PEAK PULSE CURRENT % REVERSE SURGE POWER, WATTS
TA=25C PULSE WIDTH (td) is DEFINED as the POINT WHERE the PEAK CURRENT DECAYS to 50% of IPP
10,000
tr=10ms
100
PEAK VALUE IPP
50
HALF VALUE - IPP 2 10/1000ms
0
td
0
5
10
15 20 25 t, TIME, ms
30
35
40
1,000
FIG. 5 - LOAD DUMP POWER CHARACTERISTICS (10ms EXPONENTIAL WAVEFORM)
100 10 PULSE WIDTH (ms) - 1/2 IPP EXPONENTIAL WAVEFORM
FIG. 6 - TYPICAL REVERSE CHARACTERISTICS
6,000
INSTANTANEOUS REVERS CURRENT, MICRO AMPERES
100 10 1 0.1 0.01 0.001
25C 175C
LOAD DUMP POWER, WATTS
5,000 4,000 3,000 2,000 1,000 0 25 50
0.0001 65 50 35 20 5 150 175 125 100 75 PERCENTAGE OF V(BR), % CASE TEMPERATURE, C FIG. 7 - TYPICAL TRANSIENT THERMAL IMPEDANCE
80
95
TRANSIENT THERMAL IMPEDANCE, C/W
100
RQJA
10
1
RQJC
0.1
0.01 0.01
0.1
1 PULSE WIDTH, sec.
10
100

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