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1SMB54AT3 Equivalent & Substitute Parts
Part Overview
The 1SMB54AT3 is a unidirectional transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 54V reverse standoff voltage with an 87.1V maximum clamping voltage and 6.9A peak pulse current capability in a DO-214AA (SMB) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 1SMB54AT3 |
| Manufacturer | onsemi |
| Category | Transient Voltage Suppressors (TVS) |
| Package / Case | DO-214AA, SMB |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 54V |
| Voltage - Breakdown (Min) | 60V |
| Voltage - Clamping (Max) @ Ipp | 87.1V |
| Current - Peak Pulse (10/1000µs) | 6.9A |
| Power - Peak Pulse | 600W |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution for the 1SMB54AT3 is determined by strict electrical and mechanical parameter matching:
Critical Matching Parameters:
- Voltage - Reverse Standoff (Typ): 54V
- Voltage - Clamping (Max) @ Ipp: 87.1V
- Current - Peak Pulse (10/1000µs): 6.9A
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA, SMB
- Unidirectional configuration (1 channel)
- Type: Zener
Substitution Categories:
Direct Substitutes maintain all critical electrical parameters and package specifications. These parts are functionally equivalent and can replace the 1SMB54AT3 without circuit modification.
Similar Substitutes maintain the core voltage and current ratings but may differ in package type, temperature range, or channel configuration. These require verification of mechanical fit and thermal requirements before implementation.
Parameter Comparison
| Parameter | 1SMB54AT3 (onsemi) | SMBJ54A (MDD) | PTVS54VP1UP,115 (NXP) | SMBJ54A-13-F (Diodes Inc.) | SMBJ54A-HR (Littelfuse) | SMBJ54A-HRA (Littelfuse) | SMBJ54A-TP (MCC) |
|---|---|---|---|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 54V | 54V | 54V | 54V | 54V | 54V | 54V |
| Voltage - Breakdown (Min) | 60V | 60V | 60V | 60V | 60V | 60V | 60V |
| Voltage - Clamping (Max) @ Ipp | 87.1V | 87.1V | 87.1V | 87.1V | 87.1V | 87.1V | 87.1V |
| Current - Peak Pulse (10/1000µs) | 6.9A | 6.9A | 6.9A | 6.9A | 6.9A | 6.9A | 6.9A |
| Power - Peak Pulse | 600W | 600W | 600W | 600W | 600W | 600W | 600W |
| Package / Case | DO-214AA, SMB | DO-214AA, SMB | SOD-128 | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB |
| Type | Zener | Zener | Zener | Zener | Zener | Zener | Zener |
| Unidirectional Channels | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Operating Temperature | -65°C ~ 150°C (TJ) | -50°C ~ 150°C (TJ) | -55°C ~ 150°C (TA) | -55°C ~ 150°C (TJ) | -65°C ~ 150°C (TJ) | -65°C ~ 150°C (TJ) | -55°C ~ 175°C (TJ) |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant | Not specified | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Recommendation: SMBJ54A (MDD)
The SMBJ54A from MDD is the direct electrical and mechanical equivalent to the 1SMB54AT3. It maintains identical voltage ratings (54V standoff, 87.1V clamping), current specifications (6.9A peak pulse), and package configuration (DO-214AA/SMB). The part is in active production status with ROHS3 compliance, addressing the obsolescence of the original component. Operating temperature range of -50°C to 150°C covers most general-purpose applications, with the exception of the extended low-temperature capability of the original (-65°C minimum).
Alternative Recommendations:
SMBJ54A-13-F (Diodes Incorporated) and SMBJ54A-HR (Littelfuse) are functionally equivalent alternatives with identical electrical specifications and SMB packaging. Both are actively produced and RoHS3 compliant. SMBJ54A-HR and SMBJ54A-HRA maintain the full -65°C to 150°C temperature range of the original part, making them suitable for applications requiring extended low-temperature operation.
SMBJ54A-TP (Micro Commercial Co) offers the widest operating temperature range (-55°C to 175°C), providing additional thermal margin for high-temperature environments.
Package Consideration:
PTVS54VP1UP,115 (NXP) maintains all electrical specifications but uses SOD-128 packaging instead of DO-214AA/SMB. This part is suitable only if PCB layout accommodates the different footprint. The part includes AEC-Q101 automotive qualification, making it appropriate for automotive-grade applications.
Compliance Note:
All recommended active substitutes are RoHS3 compliant, addressing regulatory requirements that the obsolete 1SMB54AT3 does not meet.
Frequently Asked Questions (FAQ)
Q: Can SMBJ54A directly replace 1SMB54AT3 without circuit modification?
A: Yes. The SMBJ54A maintains identical electrical specifications (54V standoff, 87.1V clamping, 6.9A peak pulse) and uses the same DO-214AA/SMB package. No circuit changes are required for electrical compatibility. Verify PCB layout accommodates the specific manufacturer's package dimensions if switching between suppliers.
Q: What is the difference between unidirectional and bidirectional TVS diodes?
A: The 1SMB54AT3 and all recommended substitutes are unidirectional (single channel), meaning they protect against overvoltage in one polarity direction only. Bidirectional TVS diodes protect against overvoltage in both directions and are not suitable replacements for this application.
Q: Why is the SMBJ54A-HR recommended for low-temperature applications?
A: The SMBJ54A-HR maintains the full -65°C to 150°C operating temperature range of the original 1SMB54AT3, whereas the standard SMBJ54A is rated to -50°C minimum. For applications requiring operation below -50°C, SMBJ54A-HR or SMBJ54A-HRA are appropriate selections.
Q: Is the PTVS54VP1UP,115 suitable as a substitute?
A: The PTVS54VP1UP,115 maintains all critical electrical parameters but uses SOD-128 packaging instead of DO-214AA/SMB. This part is suitable only if the PCB layout can accommodate the different footprint. The part's AEC-Q101 automotive qualification makes it appropriate for automotive applications where the original part is not.
Q: What does RoHS3 compliance mean for this substitution?
A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations, restricting lead and other hazardous materials. The original 1SMB54AT3 is RoHS non-compliant. All recommended active substitutes are RoHS3 compliant, meeting current environmental and regulatory requirements for new designs and production.
Q: Can I use SMBJ51CA as a substitute?
A: No. The SMBJ51CA has different electrical specifications (51V standoff, 82.4V clamping, 7.3A peak pulse) and is bidirectional, making it unsuitable for this application. It does not meet the critical parameter requirements for the 1SMB54AT3.
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