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SMB8J40C-E3/5B Equivalent & Substitute Parts
Part Overview
The SMB8J40C-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 ongoing production and field replacement requirements.
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) | 11.2A |
| Peak Pulse Power | 800W |
| Operating Temperature Range | -55°C to 150°C (TJ) |
| Package Type | DO-214AA (SMB) |
| Mounting Type | Surface Mount |
| Bidirectional Channels | 1 |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitute parts for the SMB8J40C-E3/5B are grouped based on strict electrical and mechanical compatibility criteria. All substitute candidates must satisfy the following mandatory parameters:
- Reverse standoff voltage: 40V (Typ)
- Breakdown voltage minimum: 44.4V
- Package: DO-214AA (SMB) surface mount
- Bidirectional channels: 1
- Operating temperature range: minimum -55°C to 150°C
- RoHS3 compliance
Substitutes are classified into two categories based on clamping voltage and peak pulse current characteristics:
Category A (Higher Clamping Voltage): Parts with clamping voltage at or above 71.4V, suitable for direct replacement where the original 71.4V specification is required.
Category B (Lower Clamping Voltage): Parts with clamping voltage between 64.5V and 84V, acceptable where circuit design permits voltage variation within the specified range.
Parameter Comparison
| Part Number | Manufacturer | Clamping Voltage (Max) @ Ipp | Peak Pulse Current (10/1000µs) | Peak Pulse Power | Operating Temp Range | Product Status | Automotive Grade |
|---|---|---|---|---|---|---|---|
| SMB8J40C-E3/5B | Vishay | 71.4V | 11.2A | 800W | -55°C to 150°C | Obsolete | No |
| SMB8J40CA-E3/5B | Vishay | 64.5V | 12.4A | 800W | -55°C to 150°C | Active | No |
| ATV06B400JB-HF | Comchip Technology | 64.5V | 9.3A | 600W | -55°C to 150°C | Active | Yes (AEC-Q101) |
| SM6T47CAY | STMicroelectronics | 84V | 48A (8/20µs) | 600W | -55°C to 150°C | Active | Yes (AEC-Q101) |
| SMB10J40CA | Formosa Microsemi | 64.5V | 15.5A | 1000W | -55°C to 175°C | Active | No |
| SMB10J40CA-TP | Micro Commercial Co | 64.5V | 15.5A | 1000W | -55°C to 150°C | Active | No |
| SMB10J40CAH | Taiwan Semiconductor | 64.5V | 15.5A | 1000W | -55°C to 175°C | Active | Yes (AEC-Q101) |
| SMB10J40CAHR5G | Taiwan Semiconductor | 64.5V | 15.5A | 1000W | -55°C to 175°C | Discontinued at DiGi Electronics | Yes (AEC-Q101) |
| SMBJ40C | Taiwan Semiconductor | 71.4V | 8.8A | 600W | -55°C to 150°C | Active | No |
| SMBJ40CA | MDD | 64.5V | 9.3A | 600W | -50°C to 150°C | Active | No |
Engineering Selection Recommendations
Primary Recommendation for Direct Replacement:
SMBJ40C (Taiwan Semiconductor) is the preferred substitute. It maintains the original 71.4V clamping voltage specification, operates within the required temperature range (-55°C to 150°C), and holds active product status. This part provides electrical equivalence without circuit redesign.
Secondary Recommendations for Voltage-Tolerant Applications:
SMB8J40CA-E3/5B (Vishay) is suitable where 64.5V clamping voltage is acceptable. As a Vishay product from the same manufacturer family, it provides continuity with the original design intent and maintains 800W peak pulse power rating.
SMB10J40CAH (Taiwan Semiconductor) offers enhanced performance with 15.5A peak pulse current and 1000W power rating. This part includes AEC-Q101 automotive qualification and extended temperature range (-55°C to 175°C), making it suitable for demanding applications. The 64.5V clamping voltage requires circuit validation.
For Automotive Applications:
ATV06B400JB-HF (Comchip Technology) and SMB10J40CAH (Taiwan Semiconductor) both carry AEC-Q101 qualification. ATV06B400JB-HF maintains the 40V standoff specification with 64.5V clamping. SMB10J40CAH provides superior current handling (15.5A) and power dissipation (1000W).
Parts to Avoid:
SMB10J40CAHR5G is discontinued at DiGi Electronics and should not be selected for new designs or ongoing production.
Frequently Asked Questions (FAQ)
Q: Can SMB8J40CA-E3/5B replace SMB8J40C-E3/5B directly?
A: Yes, with circuit validation. Both parts share the same manufacturer (Vishay), reverse standoff voltage (40V), breakdown voltage (44.4V), and operating temperature range. The clamping voltage differs (64.5V vs. 71.4V), requiring confirmation that the lower clamping voltage does not exceed circuit protection thresholds.
Q: What is the difference between the SMB10J40 series and the original SMB8J40C?
A: The SMB10J40 series provides higher peak pulse current (15.5A vs. 11.2A) and peak pulse power (1000W vs. 800W). Both maintain the 40V standoff and 44.4V breakdown specifications. The SMB10J40 series is suitable for applications requiring greater transient energy absorption.
Q: Is the SM6T47CAY suitable as a substitute?
A: The SM6T47CAY meets all mandatory electrical parameters (40V standoff, 44.4V breakdown, DO-214AA package) and includes AEC-Q101 automotive qualification. However, its 84V clamping voltage is significantly higher than the original 71.4V specification. Use only if circuit design permits this voltage elevation.
Q: What does AEC-Q101 qualification mean for TVS diode selection?
A: AEC-Q101 is an automotive electronics qualification standard. Parts carrying this certification have undergone rigorous testing for reliability, temperature cycling, and performance consistency. These parts are suitable for automotive and high-reliability applications.
Q: Can I use SMBJ40CA (MDD) as a substitute?
A: SMBJ40CA meets the core electrical specifications (40V standoff, 44.4V breakdown, DO-214AA package) and is active. However, its operating temperature range is -50°C to 150°C, which does not extend to the original -55°C minimum. Use only if the application does not require operation below -50°C.
Q: Why do some substitutes have different peak pulse current ratings?
A: Peak pulse current rating reflects the device's ability to absorb transient energy. Higher ratings (15.5A vs. 11.2A) indicate greater transient suppression capability. Selection depends on the actual transient current magnitude in the circuit. Lower-rated devices are suitable for lower-energy transients.
Q: What is the significance of packaging format (Tape & Reel vs. Bulk)?
A: Packaging format affects supply chain logistics and handling. Tape & Reel (TR) is standard for automated assembly lines. Bulk packaging is used for manual assembly or lower-volume applications. Electrical performance is identical; selection is based on manufacturing process requirements.
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