SS34Surface-mount Schottky rectifier
A compact forward path for low-voltage power.
SS34 is a surface-mount Schottky rectifier. This page follows the Vishay SS34-E3 in SMC (DO-214AB): its band marks the cathode, and S4 identifies the device. Other manufacturers may use a different package for the same short name; always match the full ordering reference. The metal–semiconductor barrier allows a low forward drop. Current capability still depends on cooling, while reverse leakage increases with heat. The package’s broad plated contacts carry current and conduct heat into the PCB. The illustrated 5 V, 100 Ω bench circuit demonstrates series polarity protection. Assuming a 0.4 V drop gives 4.6 V and 46 mA at the load. These are teaching calculations, not guaranteed measurements or a demonstration of the full current rating.
2Physical pins
SS34-E3SMC
Manufacturer-referencedVishay General Semiconductor
Pin diagram
Select a pin to explore its connection
Highlight
SS34-E3SMCTop view · cathode 1 at band · anode 2 opposite
Click a lead or use the arrow keys. Top view · cathode 1 at band · anode 2 opposite
PIN 1 · Cathode / band
CathodeK
Function
The body band identifies the cathode end.
How to connect
Connect to the load positive in the series polarity-protection example.
Electrical note
Pad 1 = cathode is this page’s PCB convention; the manufacturer identifies the leads by polarity.
PIN 2 · Anode
AnodeA
Function
Forward conventional current enters the anode and exits the cathode.
How to connect
Connect to the isolated source positive in the example.
Electrical note
Use external current limiting. Forward drop and reverse leakage both depend on temperature.
Key specifications
The Schottky junction provides low forward voltage without the stored minority charge of a conventional PN rectifier. Junction capacitance and reverse leakage remain important.
Reverse peak limit40 V · absolute maximum
Average current3 A · lead-temperature derating
Maximum drop0.5 V · 3 A pulse test
Junction maximum150 °C · absolute limit
Package details
SS34-E3 · SMC
| Property | Details |
|---|---|
| Manufacturer | Vishay General Semiconductor |
| Part number | SS34-E3 |
| Package | SMC |
| Connections | 2 pins |
| Mounting | Surface mount |
| Lead pitch | 6.41 mm · land centers |
| Package code | DO-214AB |
| Thermal reference | 150°C junction maximum; current derates with lead temperature |
Device and polarity
Vishay commercial SS34-E3
Manufacturer specifications 3 parameters
Scroll sideways to see all columns.
| 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 |
No specifications match. Try a parameter name or a unit.
Package and ratings refer to this specific manufacturer.
Absolute maximum ratings
SS34 column; check mounting and derating
Manufacturer specifications 6 parameters
Scroll sideways to see all columns.
| 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 |
No specifications match. Try a parameter name or a unit.
Pulse ratings are not continuous operating ratings.
Electrical characteristics
Selected SS34 column
Manufacturer specifications 4 parameters
Scroll sideways to see all columns.
| 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 |
No specifications match. Try a parameter name or a unit.
Thermal performance depends on the actual PCB.
Package and lands
SMC drawing and authored mounting
Manufacturer specifications 5 parameters
Scroll sideways to see all columns.
| 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 |
No specifications match. Try a parameter name or a unit.
Confirm solder process and fabrication tolerances.
Polarity-protection example
Calculated, not measured
Manufacturer specifications 6 parameters
Scroll sideways to see all columns.
| 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 |
No specifications match. Try a parameter name or a unit.
Measure actual forward voltage and check worst-case supply, load and temperature.
Connections by function
Select a pin for its function, connection guidance and electrical notes.
Cathode / band1 pin
Anode1 pin
SS34 at a glance
Follow the labeled connections and functional stages
How it works
3 stages · Explore one step at a time
Read the band
The cathode band faces the protected positive output.
Pass the intended polarity
With positive voltage at the anode, the diode conducts through the load.
Respect the limits
Reversed source polarity produces reverse bias. Stay below the reverse rating and account for leakage and heating.
Step 1 of 3
SS34 in a circuit
A physical diode in series with a current-limited load.
Connect it, step by step
Follow the component values and pin connections
Source to anode
Connect +5 V to A2.
Band to load
Connect K1 to the 100 Ω resistor.
Common return
Both ground symbols refer to the same source-negative connection.
Inside SS34
Metal–semiconductor barrier inside the SMC package.
Explore the circuit
Select a stage to see its role and connections
Barrier contact
The metal contact and semiconductor establish the rectifying barrier.
Forward bias
Conduction occurs at a voltage that varies with current and temperature.
Reverse bias
Leakage rises with temperature; stay within reverse-voltage and heat limits.
Selected packageSMCSS34-E3
Physical connections2 pinsPackage-specific numbering
Reference collection6 tables24 parameters & pin functions
Pin reference
Signal names, electrical functions and connection guidance
Physical pin numbers2 pins
Scroll within the table to see all columns and rows.
| 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. |
No pins match these filters. Try another signal name or reset the filters.
Device and polarity
Vishay commercial SS34-E3
Manufacturer-referenced values3 parameters
Scroll within the table to see all columns and rows.
| 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 |
No specifications match. Try a parameter name or a unit.
Package and ratings refer to this specific manufacturer.
Absolute maximum ratings
SS34 column; check mounting and derating
Manufacturer-referenced values6 parameters
Scroll within the table to see all columns and rows.
| 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 |
No specifications match. Try a parameter name or a unit.
Pulse ratings are not continuous operating ratings.
Electrical characteristics
Selected SS34 column
Manufacturer-referenced values4 parameters
Scroll within the table to see all columns and rows.
| 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 |
No specifications match. Try a parameter name or a unit.
Thermal performance depends on the actual PCB.
Package and lands
SMC drawing and authored mounting
Manufacturer-referenced values5 parameters
Scroll within the table to see all columns and rows.
| 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 |
No specifications match. Try a parameter name or a unit.
Confirm solder process and fabrication tolerances.
Polarity-protection example
Calculated, not measured
Manufacturer-referenced values6 parameters
Scroll within the table to see all columns and rows.
| 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 |
No specifications match. Try a parameter name or a unit.
Measure actual forward voltage and check worst-case supply, load and temperature.
No matching rowsTry a pin name, parameter, unit or test condition, or reset the filters.
Polarity protection
A series diode can block an accidentally reversed low-voltage source, with forward-voltage loss.
Manufacturer application guideFreewheel paths
Provide an inductive-current path within voltage, current and thermal limits.
Manufacturer application guideLow-voltage converters
Evaluate conduction loss, reverse leakage and capacitance in switching power circuits.
Manufacturer application guideTake it into ProTech
Find SS34 in the Components Library to place its schematic symbol and connect its pins.
Reference page · circuit simulation model not yet availableOpen ProTech