BETASelected packageSMBSMBJ5.0A-E3
Unidirectional transient suppressor
SMBJ5.0A Reference Tables
Search the SMBJ5.0A pin reference and manufacturer-referenced specification tables.
Physical connections2 pinsPackage-specific numbering
Reference collection6 tables23 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 | 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. |
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Package and polarity
Vishay SMBJ5.0A-E3
Manufacturer-referenced values3 parameters
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| 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 |
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This page does not substitute bidirectional specifications.
Voltage thresholds
25°C selected device row
Manufacturer-referenced values5 parameters
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| 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 |
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Clamping voltage is higher than both stand-off and breakdown.
Pulse and temperature limits
Waveform and mounting dependent
Manufacturer-referenced values5 parameters
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| 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 |
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The pulse test uses specified copper mounting.
SMB mounting
Manufacturer outline and authored lands
Manufacturer-referenced values5 parameters
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| 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 |
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Keep the surge loop short.
Protection design checks
Conceptual 5 V input
Manufacturer-referenced values5 parameters
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| 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 |
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This circuit is explanatory, not a validated protection design.
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