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SMBJ5.0AUnidirectional transient suppressor
Give a voltage spike a short path to ground.
SMBJ5.0A is a unidirectional transient-voltage suppressor. It connects across a protected DC rail, with its banded cathode at the positive node and its anode at ground. A short, low-inductance return helps divert surge current away from the load. The stand-off voltage, breakdown voltage and clamping voltage describe different conditions. A 5 V stand-off rating does not mean the rail will be held at exactly 5 V during a surge. The protected circuit must tolerate the actual clamp voltage, including wiring overshoot. This reference follows Vishay’s commercial SMB part. The diagram illustrates a protected 5 V input with a fuse and upstream source impedance. The fuse handles sustained faults; the TVS handles appropriately limited transients. Select both from the real source, load and pulse requirements.
2Physical pins
SMBJ5.0A-E3SMB
Manufacturer-referencedVishay General Semiconductor
Pin diagram
Select a pin to explore its connection
Highlight
SMBJ5.0ASMBTop 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 · Protected positive rail
CathodeK
Function
Banded terminal connected to the protected positive rail.
How to connect
Place close to the input after the coordinated fuse.
Electrical note
5 V stand-off is not the surge clamping voltage.
PIN 2 · Ground return
AnodeA
Function
Return for reverse avalanche current.
How to connect
Use a short path to the common ground.
Electrical note
Reverse supply polarity forward-biases this unidirectional device.
Key specifications
Stand-off, breakdown and clamping voltage must be checked separately.
Stand-off voltage5 V
Breakdown range6.40–7.07 V · at 10 mA
Maximum clamp9.2 V · at 65.2 A pulse
Peak pulse power600 W · specified 10/1000 µs pulse
Package details
SMBJ5.0A-E3 · SMB
| Property | Details |
|---|---|
| Manufacturer | Vishay General Semiconductor |
| Part number | SMBJ5.0A-E3 |
| Package | SMB |
| Connections | 2 pins |
| Mounting | Surface mount |
| Lead pitch | 3.8745 mm · land centers |
| Package code | DO-214AA |
| Thermal reference | Pulse capability depends on waveform, temperature and mounting |
Package and polarity
Vishay SMBJ5.0A-E3
Manufacturer specifications 3 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Configuration | Unidirectional | SMBJ5.0CA is a different device |
| Package / marking | SMB / KE | DO-214AA; band = cathode |
| Pad convention | K1 / A2 | Positive rail / return |
No specifications match. Try a parameter name or a unit.
This page does not substitute bidirectional specifications.
Voltage thresholds
25°C selected device row
Manufacturer specifications 5 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Stand-off voltage | 5 V | Reverse working voltage |
| Breakdown range | 6.40–7.07 V | 10 mA; pulse ≤50 ms |
| Maximum leakage | 800 µA | At stand-off |
| Maximum clamp | 9.2 V | 65.2 A specified pulse |
| Breakdown temperature coefficient | 0.057%/°C maximum | Manufacturer parameter |
No specifications match. Try a parameter name or a unit.
Clamping voltage is higher than both stand-off and breakdown.
Pulse and temperature limits
Waveform and mounting dependent
Manufacturer specifications 5 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Peak pulse power | 600 W | 10/1000 µs; derate above 25°C |
| Peak pulse current | 65.2 A | Specified waveform; not continuous |
| Junction / storage | −55 to +150°C | Absolute limits |
| Forward surge | 100 A | Single 8.3 ms half sine |
| Power dissipation | 5 W | Infinite heatsink at 50°C; not a small-board guarantee |
No specifications match. Try a parameter name or a unit.
The pulse test uses specified copper mounting.
SMB mounting
Manufacturer outline and authored lands
Manufacturer specifications 5 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Body | 4.06–4.57 × 3.30–3.94 mm | Molded outline |
| Height | 2.13–2.44 mm | Package drawing |
| Overall span | 5.21–5.59 mm | Including contacts |
| Authored copper | 1.7155 × 2.18 mm | 3.8745 mm centers |
| Inner gap | 2.159 mm | Verify assembly tolerances |
No specifications match. Try a parameter name or a unit.
Keep the surge loop short.
Protection design checks
Conceptual 5 V input
Manufacturer specifications 5 parameters
Scroll sideways to see all columns.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Fuse | Coordinate with fault current | No universal fuse rating is implied |
| Source impedance | Must limit available surge energy | Include cables and upstream protection |
| Load tolerance | Must exceed actual transient voltage | 9.2 V specified clamp plus overshoot |
| TVS return | Short and wide | Minimize parasitic inductance |
| Pulse power arithmetic | 9.2 × 65.2 ≈ 600 W | Specified test point, not continuous power |
No specifications match. Try a parameter name or a unit.
This circuit is explanatory, not a validated protection design.
Connections by function
Select a pin for its function, connection guidance and electrical notes.
Protected positive rail1 pin
Ground return1 pin
SMBJ5.0A at a glance
Follow the labeled connections and functional stages
How it works
3 stages · Explore one step at a time
Normal input
At the working voltage the TVS is reverse biased; leakage remains.
Transient arrives
As the junction enters breakdown, reverse current rises and limits the rail excursion.
Energy and fault protection
The surge must stay within the pulse envelope. A coordinated fuse or other upstream protection handles sustained faults.
Step 1 of 3
SMBJ5.0A in a circuit
TVS across the input, with coordinated upstream protection.
Connect it, step by step
Follow the component values and pin connections
Protected node
Connect the banded cathode to the protected positive rail.
Short return
Connect the anode directly to the local return.
Coordinate protection
The TVS does not replace a fuse for sustained faults.
Inside SMBJ5.0A
Compact conceptual junction cutaway.
Explore the circuit
Select a stage to see its role and connections
Normal input
At the working voltage the TVS is reverse biased; leakage remains.
Transient arrives
As the junction enters breakdown, reverse current rises and limits the rail excursion.
Energy and fault protection
The surge must stay within the pulse envelope. A coordinated fuse or other upstream protection handles sustained faults.
Selected packageSMBSMBJ5.0A-E3
Physical connections2 pinsPackage-specific numbering
Reference collection6 tables23 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 | Banded terminal connected to the protected positive rail.Connection guidancePlace close to the input after the coordinated fuse. 5 V stand-off is not the surge clamping voltage. | |
| A | Anode | Return for reverse avalanche current.Connection guidanceUse a short path to the common ground. Reverse supply polarity forward-biases this unidirectional device. |
No pins match these filters. Try another signal name or reset the filters.
Package and polarity
Vishay SMBJ5.0A-E3
Manufacturer-referenced values3 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Configuration | Unidirectional | SMBJ5.0CA is a different device |
| Package / marking | SMB / KE | DO-214AA; band = cathode |
| Pad convention | K1 / A2 | Positive rail / return |
No specifications match. Try a parameter name or a unit.
This page does not substitute bidirectional specifications.
Voltage thresholds
25°C selected device row
Manufacturer-referenced values5 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Stand-off voltage | 5 V | Reverse working voltage |
| Breakdown range | 6.40–7.07 V | 10 mA; pulse ≤50 ms |
| Maximum leakage | 800 µA | At stand-off |
| Maximum clamp | 9.2 V | 65.2 A specified pulse |
| Breakdown temperature coefficient | 0.057%/°C maximum | Manufacturer parameter |
No specifications match. Try a parameter name or a unit.
Clamping voltage is higher than both stand-off and breakdown.
Pulse and temperature limits
Waveform and mounting dependent
Manufacturer-referenced values5 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Peak pulse power | 600 W | 10/1000 µs; derate above 25°C |
| Peak pulse current | 65.2 A | Specified waveform; not continuous |
| Junction / storage | −55 to +150°C | Absolute limits |
| Forward surge | 100 A | Single 8.3 ms half sine |
| Power dissipation | 5 W | Infinite heatsink at 50°C; not a small-board guarantee |
No specifications match. Try a parameter name or a unit.
The pulse test uses specified copper mounting.
SMB mounting
Manufacturer outline and authored lands
Manufacturer-referenced values5 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Body | 4.06–4.57 × 3.30–3.94 mm | Molded outline |
| Height | 2.13–2.44 mm | Package drawing |
| Overall span | 5.21–5.59 mm | Including contacts |
| Authored copper | 1.7155 × 2.18 mm | 3.8745 mm centers |
| Inner gap | 2.159 mm | Verify assembly tolerances |
No specifications match. Try a parameter name or a unit.
Keep the surge loop short.
Protection design checks
Conceptual 5 V input
Manufacturer-referenced values5 parameters
Scroll within the table to see all columns and rows.
| Parameter | Value | Conditions / notes |
|---|---|---|
| Fuse | Coordinate with fault current | No universal fuse rating is implied |
| Source impedance | Must limit available surge energy | Include cables and upstream protection |
| Load tolerance | Must exceed actual transient voltage | 9.2 V specified clamp plus overshoot |
| TVS return | Short and wide | Minimize parasitic inductance |
| Pulse power arithmetic | 9.2 × 65.2 ≈ 600 W | Specified test point, not continuous power |
No specifications match. Try a parameter name or a unit.
This circuit is explanatory, not a validated protection design.
No matching rowsTry a pin name, parameter, unit or test condition, or reset the filters.
DC input protection
Protect appropriately rated downstream circuitry from limited transients.
Manufacturer application guideInductive transients
Choose a clamp from the actual pulse current, voltage and repetition rate.
Manufacturer application guidePeripheral interfaces
Check signal voltage, capacitance and surge requirements before selecting a TVS.
Manufacturer application guideTake it into ProTech
Find SMBJ5.0A in the Components Library to place its schematic symbol and connect its pins.
Reference page · circuit simulation model not yet availableOpen ProTech