BETASelected packageSMCSS34-E3
Surface-mount Schottky rectifier
SS34 Reference Tables
Search the SS34 pin reference and manufacturer-referenced specification tables.
Physical connections2 pinsPackage-specific numbering
Reference collection6 tables24 parameters & pin functions
Pin reference
Signal names, electrical functions and connection guidance
Physical pin numbers2 pins
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| Pin | Signal | Type | Function & connection |
|---|---|---|---|
| K | Cathode | The body band identifies the cathode end.Connection guidanceConnect to the load positive in the series polarity-protection example. Pad 1 = cathode is this page’s PCB convention; the manufacturer identifies the leads by polarity. | |
| A | Anode | Forward conventional current enters the anode and exits the cathode.Connection guidanceConnect to the isolated source positive in the example. Use external current limiting. Forward drop and reverse leakage both depend on temperature. |
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Device and polarity
Vishay commercial SS34-E3
Manufacturer-referenced values3 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Package / marking | SMC / S4 | DO-214AB; cathode band |
| Footprint convention | K1 / A2 | Cathode left; anode right |
| Surface finish | Matte tin | Silver plated contacts |
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Package and ratings refer to this specific manufacturer.
Absolute maximum ratings
SS34 column; check mounting and derating
Manufacturer-referenced values6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Reverse peak / DC | 40 V | VRRM / VDC |
| RMS reverse | 28 V | VRMS |
| Average current | 3 A | Lead-temperature derating curve |
| Surge current | 100 A | Single 8.3 ms half sine on rated load |
| Avalanche energy | 20 mJ | 25°C; 2 A; 10 mH; nonrepetitive |
| Junction / storage | −55 to +150°C | Absolute limits |
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Pulse ratings are not continuous operating ratings.
Electrical characteristics
Selected SS34 column
Manufacturer-referenced values4 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Forward drop | 0.5 V maximum | 3 A; 300 µs pulse, 1% duty |
| Leakage at 25°C | 0.5 mA maximum | Rated blocking voltage |
| Leakage at 100°C | 20 mA maximum | Rated blocking voltage |
| RθJA / RθJL | 55 / 17°C/W typical | 14 × 14 mm copper pad area |
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Thermal performance depends on the actual PCB.
Package and lands
SMC drawing and authored mounting
Manufacturer-referenced values5 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Body length / width | 6.60–7.11 / 5.59–6.22 mm | Molded outline |
| Height | 2.06–2.62 mm | Package drawing |
| Overall length | 7.75–8.13 mm | Including contacts |
| Authored lands | 1.72 × 3.20 mm | 6.41 mm centers |
| Inner gap | 4.69 mm | Cathode left; anode right |
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Confirm solder process and fabrication tolerances.
Polarity-protection example
Calculated, not measured
Manufacturer-referenced values6 parameters
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| Parameter | Value | Conditions / notes |
|---|---|---|
| Source / load | 5 V DC / 100 Ω | Isolated current-limited source |
| Assumed diode drop | 0.4 V | Teaching approximation |
| Output voltage | 4.6 V | 5 − 0.4 |
| Forward current | 46 mA | 4.6 / 100 |
| Load dissipation | 211.6 mW | Use 0.5 W or greater here |
| Diode dissipation | 18.4 mW | 0.4 × 0.046 |
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Measure actual forward voltage and check worst-case supply, load and temperature.
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