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SMBJ40C-E3/5B Equivalent & Substitute Parts
Part Overview
The SMBJ40C-E3/5B is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 40V reverse standoff voltage and provides 71.4V clamping at peak pulse current. The device is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reverse Standoff Voltage (Typ) | 40V |
| Breakdown Voltage (Min) | 44.4V |
| Clamping Voltage (Max) @ Ipp | 71.4V |
| Peak Pulse Current (10/1000µs) | 8.4A |
| Peak Pulse Power | 600W |
| Operating Temperature Range | -55°C to 150°C (TJ) |
| Package / Case | DO-214AA, SMB |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the SMBJ40C-E3/5B is determined by the following critical parameters:
- Reverse Standoff Voltage: Must be 40V (±tolerance as specified by manufacturer)
- Package / Case: Must be DO-214AA or SMB equivalent
- Mounting Type: Surface mount only
- Bidirectional Channels: Single channel (1)
- Type: Zener diode TVS
- RoHS Compliance: ROHS3 Compliant
Substitute parts are grouped into two electrical categories based on clamping voltage performance:
Category A (71.4V Clamping): Direct electrical equivalents with identical clamping voltage specifications. These parts maintain the exact voltage protection profile of the original part.
Category B (64.5V Clamping): Alternative parts with lower clamping voltage but identical reverse standoff and breakdown voltages. These provide tighter voltage clamping and higher peak pulse current capability (9.3A vs 8.4A).
Category C (84V Clamping): Higher clamping voltage alternative with significantly higher peak pulse current (48A at 8/20µs). This part is suitable for applications requiring enhanced transient energy absorption.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current | Peak Pulse Power (W) | Operating Temp (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|
| SMBJ40C-E3/5B | Vishay | Obsolete | 40 | 44.4 | 71.4 | 8.4A (10/1000µs) | 600 | -55 to 150 | DO-214AA (SMBJ) |
| SMBJ40CE3/TR13 | Microchip Technology | Active | 40 | 44.4 | 71.4 | 8.4A (10/1000µs) | 600 | -65 to 150 | DO-214AA (SMBJ) |
| SMBJ40CA-E3/5B | Vishay | Active | 40 | 44.4 | 64.5 | 9.3A (10/1000µs) | 600 | -55 to 150 | DO-214AA (SMBJ) |
| SMBJ40CA-TP | Micro Commercial Co | Active | 40 | 44.4 | 64.5 | 9.3A (10/1000µs) | 600 | -55 to 175 | DO-214AA (SMB) |
| SMBJ40CA-13-F | Diodes Incorporated | Active | 40 | 44.4 | 64.5 | 9.3A (10/1000µs) | 600 | -55 to 150 | DO-214AA (SMB) |
| 1SMB40CA BK PBFREE | Central Semiconductor Corp | Active | 40 | 44.4 | 64.5 | 9.3A (10/1000µs) | 600 | -65 to 150 | DO-214AA (SMB) |
| SMBJ40CA | MDD | Active | 40 | 44.4 | 64.5 | 9.3A (10/1000µs) | 600 | -50 to 150 | DO-214AA (SMB) |
| SM6T47CAY | STMicroelectronics | Active | 40 | 44.4 | 84 | 48A (8/20µs) | 600 | -55 to 150 | DO-214AA (SMB) |
Engineering Selection Recommendations
Primary Recommendation - Category A (Direct Electrical Equivalent):
SMBJ40CE3/TR13 (Microchip Technology) is the preferred direct replacement for the obsolete SMBJ40C-E3/5B. This part maintains identical electrical specifications (71.4V clamping, 8.4A peak pulse current) and package configuration. Microchip Technology is an active manufacturer with established supply chain presence. The extended operating temperature range (-65°C to 150°C) provides additional thermal margin compared to the original part.
Secondary Recommendation - Category B (Lower Clamping Voltage):
SMBJ40CA-E3/5B (Vishay) or SMBJ40CA-TP (Micro Commercial Co) are suitable alternatives when tighter voltage clamping is acceptable. These parts reduce clamping voltage from 71.4V to 64.5V while increasing peak pulse current to 9.3A. Both maintain ROHS3 compliance and DO-214AA packaging. SMBJ40CA-TP offers extended operating temperature to 175°C. Selection between these options depends on supply chain availability and packaging requirements (tape & reel vs. bulk).
Alternative Recommendation - Category C (Enhanced Transient Protection):
SM6T47CAY (STMicroelectronics) provides significantly higher transient energy absorption capability with 48A peak pulse current (8/20µs measurement) and 84V clamping voltage. This part is suitable for applications requiring enhanced overvoltage protection margins. STMicroelectronics maintains AEC-Q101 automotive qualification. High inventory availability (855,300 pcs) ensures supply continuity.
All recommended substitutes maintain ROHS3 compliance, MSL 1 rating, and surface-mount DO-214AA packaging compatibility with the original design.
Frequently Asked Questions (FAQ)
Q: Can SMBJ40CA-E3/5B replace SMBJ40C-E3/5B directly in the circuit?
A: Yes, with circuit validation. Both parts share identical reverse standoff voltage (40V), breakdown voltage (44.4V), and package (DO-214AA). The SMBJ40CA variant reduces clamping voltage from 71.4V to 64.5V and increases peak pulse current from 8.4A to 9.3A. This provides tighter voltage protection. Verify that the lower clamping voltage does not exceed downstream component voltage ratings.
Q: What is the difference between the clamping voltage variants?
A: Clamping voltage determines the maximum voltage the TVS diode allows across its terminals during a transient event. The original SMBJ40C-E3/5B clamps at 71.4V, while SMBJ40CA variants clamp at 64.5V, and SM6T47CAY clamps at 84V. Lower clamping voltage provides tighter protection but requires verification that protected components tolerate this voltage. Higher clamping voltage allows higher transient voltages but may exceed component ratings.
Q: Are all substitute parts available in the same packaging?
A: All recommended substitutes use DO-214AA (SMB) surface-mount packaging, maintaining mechanical compatibility with the original design. Packaging options vary by manufacturer: some are supplied in tape & reel (TR), cut tape (CT), or bulk. Verify specific packaging availability with your supplier before design finalization.
Q: Does the operating temperature range affect substitution?
A: Operating temperature ranges vary among substitutes. The original part operates -55°C to 150°C. SMBJ40CE3/TR13 extends to -65°C, SMBJ40CA-TP extends to 175°C, and SMBJ40CA (MDD) operates -50°C to 150°C. Select based on your application's thermal requirements. Extended temperature ranges provide additional design margin but do not affect electrical substitution compatibility.
Q: Why is SM6T47CAY listed as a substitute if it has different clamping voltage?
A: SM6T47CAY maintains the critical 40V reverse standoff voltage and 44.4V breakdown voltage, ensuring it responds to the same trigger threshold as the original part. The higher clamping voltage (84V) and significantly higher peak pulse current (48A) make it suitable for applications requiring enhanced transient energy absorption. This part is not a direct replacement but an alternative for designs where additional protection margin is beneficial.
Q: Are all substitutes RoHS3 compliant?
A: Yes, all recommended substitute parts are ROHS3 compliant with MSL 1 (unlimited) moisture sensitivity rating, matching the original part's compliance profile.
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