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SMBJ12A-TP Equivalent & Substitute Parts
Part Overview
The SMBJ12A-TP is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co in DO-214AA (SMB) surface mount package. This component provides transient overvoltage protection for general-purpose applications with a 12V reverse standoff voltage and 19.9V maximum clamping voltage at peak pulse current of 30.2A. The part is active, RoHS3 compliant, and carries unlimited moisture sensitivity level (MSL 1). Equivalent and substitute parts are identified based on matching electrical performance parameters and compatible package specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 12 | V |
| Voltage - Breakdown (Min) | 13.3 | V |
| Voltage - Clamping (Max) @ Ipp | 19.9 | V |
| Current - Peak Pulse (10/1000µs) | 30.2 | A |
| Power - Peak Pulse | 600 | W |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| Package / Case | DO-214AA, SMB | — |
| Mounting Type | Surface Mount | — |
| Operating Temperature Range | -55°C ~ 175°C (TJ) | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for SMBJ12A-TP are classified into two categories based on electrical and mechanical compatibility:
Direct Equivalents maintain identical electrical specifications (12V standoff, 13.3V breakdown minimum, 19.9V clamping maximum, 30.2A peak pulse current, 600W peak pulse power) and compatible package configurations (DO-214AA SMB or equivalent surface mount packages). These parts are interchangeable without circuit redesign.
Similar Substitutes maintain the same voltage ratings and peak pulse current specifications but may have minor variations in peak pulse power (500W vs 600W) or package designation (SMA vs SMB). These parts are functionally equivalent for most general-purpose transient suppression applications.
Substitution eligibility is determined by:
- Voltage - Reverse Standoff: 12V (required)
- Voltage - Clamping (Max) @ Ipp: 19.9V (required)
- Current - Peak Pulse (10/1000µs): ≥30.2A (required)
- Package / Case: DO-214AA, SMB, or SMA surface mount (required)
- Type: Zener unidirectional (required)
- RoHS3 Compliance: Yes (required)
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Package / Case | Operating Temperature | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| SMBJ12A-TP | Micro Commercial Co | 12V | 19.9V | 30.2A | 600W | DO-214AA, SMB | -55°C ~ 175°C | ROHS3 Compliant |
| SMBJ12A | EVVO Semi | 12V | 19.9V | 30.2A | 600W | DO-214AC, SMA | -65°C ~ 150°C | ROHS3 Compliant |
| SMBJ12A-13-F | Diodes Incorporated | 12V | 19.9V | 30.2A | 600W | DO-214AA, SMB | -55°C ~ 150°C | ROHS3 Compliant |
| SMBJ12A-E3/52 | Vishay General Semiconductor - Diodes Division | 12V | 19.9V | 30.2A | 600W | DO-214AA, SMB | -55°C ~ 150°C | ROHS3 Compliant |
| SMBJ12A-E3/5B | Vishay General Semiconductor - Diodes Division | 12V | 19.9V | 30.2A | 600W | DO-214AA, SMB | -55°C ~ 150°C | ROHS3 Compliant |
| SMBJ12A-M3/5B | Vishay General Semiconductor - Diodes Division | 12V | 19.9V | 30.2A | 600W | DO-214AA, SMB | -55°C ~ 150°C | ROHS3 Compliant |
| P6SMBJ12A_R1_00001 | Panjit International Inc. | 12V | 19.9V | 30.2A | 600W | DO-214AA, SMB | -55°C ~ 150°C | ROHS3 Compliant |
| SACB12 | Littelfuse Inc. | 12V | 19V | 25A | 500W | DO-214AA, SMB | -55°C ~ 150°C | ROHS3 Compliant |
| SMBJ12A-TR | STMicroelectronics | 12V | 19.9V | 31A | 600W | DO-214AA, SMB | -55°C ~ 150°C | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalents (Preferred for Drop-In Replacement): SMBJ12A-13-F (Diodes Incorporated), SMBJ12A-E3/52 (Vishay), SMBJ12A-E3/5B (Vishay), SMBJ12A-M3/5B (Vishay), P6SMBJ12A_R1_00001 (Panjit), and SMBJ12A-TR (STMicroelectronics) all maintain identical electrical specifications with the SMBJ12A-TP. All are RoHS3 compliant, active products with unlimited MSL rating. These parts are suitable for direct substitution in existing designs without circuit modification.
Alternative Equivalent (Package Variant): SMBJ12A from EVVO Semi provides identical electrical performance but uses DO-214AC (SMA) package instead of DO-214AA (SMB). This part is suitable only if the PCB layout and footprint accommodate SMA package dimensions. Operating temperature range is -65°C to 150°C, which is narrower than the main part's -55°C to 175°C range.
Similar Substitute (Reduced Performance): SACB12 (Littelfuse) maintains 12V standoff and 19V clamping voltage but specifies 25A peak pulse current and 500W peak pulse power, compared to 30.2A and 600W for the main part. This part is suitable only for applications where the reduced current and power ratings are acceptable.
All substitute parts carry ROHS3 compliance and unlimited moisture sensitivity level, matching the regulatory and environmental requirements of the main part.
Frequently Asked Questions (FAQ)
Q: Can SMBJ12A-13-F replace SMBJ12A-TP directly on the PCB? A: Yes. SMBJ12A-13-F from Diodes Incorporated is a direct electrical and mechanical equivalent. Both use DO-214AA (SMB) package and maintain identical voltage and current specifications. No circuit redesign is required.
Q: What is the difference between DO-214AA (SMB) and DO-214AC (SMA) packages? A: DO-214AA and DO-214AC are different surface mount package outlines with different footprint dimensions. SMB (DO-214AA) and SMA (DO-214AC) are not mechanically interchangeable on the same PCB. Verify PCB footprint compatibility before selecting EVVO Semi's SMBJ12A variant.
Q: Is SACB12 from Littelfuse a suitable replacement? A: SACB12 maintains the same 12V standoff voltage and 19V clamping voltage but specifies 25A peak pulse current and 500W peak pulse power versus 30.2A and 600W for SMBJ12A-TP. Use SACB12 only if your application's transient current and power requirements do not exceed these reduced ratings.
Q: Why does SMBJ12A from EVVO Semi have a narrower operating temperature range? A: EVVO Semi's SMBJ12A specifies -65°C to 150°C junction temperature, while SMBJ12A-TP specifies -55°C to 175°C. If your application requires operation above 150°C or below -65°C, select an alternative substitute with matching temperature range.
Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts are RoHS3 compliant and carry unlimited moisture sensitivity level (MSL 1), matching the regulatory and environmental specifications of SMBJ12A-TP.
Q: What is the difference between SMBJ12A-E3/52 and SMBJ12A-E3/5B from Vishay? A: Both are Vishay TransZorb® series parts with identical electrical specifications and DO-214AA (SMB) package. The suffix designations indicate different packaging formats (E3/52 is Cut Tape & Digi-Reel®; E3/5B is Tape & Reel). Electrical performance is equivalent; select based on your procurement and assembly requirements.
Q: Can SMBJ12A-TR from STMicroelectronics replace SMBJ12A-TP? A: Yes. SMBJ12A-TR maintains identical voltage specifications and exceeds the peak pulse current requirement (31A vs 30.2A). Both use DO-214AA (SMB) package. This part is suitable for direct substitution.
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