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1SMB58AT3 Equivalent & Substitute Parts
Part Overview
The 1SMB58AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface mount applications. This unidirectional Zener diode features a 58V reverse standoff voltage with a 93.6V maximum clamping voltage and 6.4A peak pulse current capability in the DO-214AA (SMB) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and production requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | 1SMB58AT3 | — |
| Manufacturer | onsemi | — |
| Category | Transient Voltage Suppressors (TVS) | — |
| Type | Zener | — |
| Package / Case | DO-214AA, SMB | — |
| Voltage - Reverse Standoff (Typ) | 58 | V |
| Voltage - Breakdown (Min) | 64.4 | V |
| Voltage - Clamping (Max) @ Ipp | 93.6 | V |
| Current - Peak Pulse (10/1000µs) | 6.4 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -65 to 150 | °C |
| Mounting Type | Surface Mount | — |
| Product Status | Obsolete | — |
| RoHS Status | RoHS non-compliant | — |
Substitute Part Grouping Explanation
Substitution of the 1SMB58AT3 is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): 58V
- Voltage - Clamping (Max) @ Ipp: 93.6V
- Current - Peak Pulse (10/1000µs): 6.4A (minimum acceptable)
- Package / Case: DO-214AA (SMB) for direct mechanical compatibility
- Mounting Type: Surface Mount
- Type: Zener, Unidirectional
Substitute parts are grouped into two categories:
Direct Substitutes (Identical Electrical & Package Specifications): Parts with matching 58V standoff voltage, 93.6V clamping voltage, DO-214AA package, and peak pulse current ≥6.4A. These parts are electrically and mechanically interchangeable.
Similar Substitutes (Comparable Electrical Performance, Different Package): Parts with matching voltage specifications but alternative surface mount packages (SOD-128). These require PCB layout modification but maintain electrical equivalence.
Related Substitutes (Adjacent Voltage Rating): Parts with nearby voltage ratings (54V standoff) that may be suitable for applications with relaxed voltage tolerance requirements.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Package / Case | Operating Temp (°C) | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| 1SMB58AT3 | onsemi | 58 | 93.6 | 6.4 | DO-214AA, SMB | -65 to 150 | Obsolete | Non-compliant |
| SMBJ58A | Meritek | 58 | 93.6 | 6.41 | DO-214AA (SMB) | -55 to 150 | Active | ROHS3 Compliant |
| SMBJ58A-TR | STMicroelectronics | 58 | 93.6 | 6.7 | DO-214AA, SMB | -55 to 150 | Active | ROHS3 Compliant |
| PTVS58VP1UP,115 | Nexperia USA Inc. | 58 | 93.6 | 6.4 | SOD-128 | -55 to 150 | Active | ROHS3 Compliant |
| SMBJ54CA-TP | Micro Commercial Co | 54 | 87.1 | 6.9 | DO-214AA, SMB | -55 to 175 | Active | ROHS3 Compliant |
| SMBJ58A-13-F | Diodes Incorporated | 58 | 93.6 | 6.4 | DO-214AA, SMB | -55 to 150 | Active | ROHS3 Compliant |
| SMBJ58A-HR | Littelfuse Inc. | 58 | 93.6 | 6.5 | DO-214AA, SMB | -65 to 150 | Active | ROHS3 Compliant |
| SMBJ58A-HRA | Littelfuse Inc. | 58 | 93.6 | 6.5 | DO-214AA, SMB | -65 to 150 | Active | ROHS3 Compliant |
| SMBJ58A-TP | Micro Commercial Co | 58 | 93.6 | 6.4 | DO-214AA, SMB | -55 to 175 | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Direct Replacement)
SMBJ58A-TR (STMicroelectronics), SMBJ58A-13-F (Diodes Incorporated), and SMBJ58A-TP (Micro Commercial Co) are the preferred direct substitutes. All three maintain identical voltage specifications (58V standoff, 93.6V clamping), DO-214AA package compatibility, and active product status. All are ROHS3 compliant, addressing the RoHS non-compliance of the obsolete 1SMB58AT3. STMicroelectronics SMBJ58A-TR offers the highest peak pulse current (6.7A) with extensive inventory availability (47,794 pcs).
Extended Temperature Range Alternative
SMBJ58A-HR and SMBJ58A-HRA (Littelfuse Inc.) match the original 1SMB58AT3 operating temperature range (-65°C to 150°C) while maintaining all electrical specifications. These are suitable for applications requiring the full temperature envelope of the original part.
Alternative Package Option
PTVS58VP1UP,115 (Nexperia USA Inc.) provides identical electrical performance in SOD-128 package with AEC-Q101 automotive qualification. This option requires PCB redesign but offers automotive-grade reliability for qualified applications.
Not Recommended
SMBJ54CA-TP (Micro Commercial Co) features a lower voltage rating (54V standoff, 87.1V clamping) and is suitable only for applications where the 4V voltage margin reduction is acceptable. This part should not be used as a direct substitute without circuit re-evaluation.
Frequently Asked Questions (FAQ)
Q: Can SMBJ58A-TR directly replace 1SMB58AT3 without PCB modification?
A: Yes. SMBJ58A-TR maintains identical voltage specifications and DO-214AA (SMB) package footprint. No PCB layout changes are required. The higher peak pulse current (6.7A vs. 6.4A) provides additional margin.
Q: What is the difference between SMBJ58A-HR and SMBJ58A-HRA?
A: Both parts are electrically identical with matching voltage ratings, peak pulse current (6.5A), and operating temperature range (-65°C to 150°C). The designation difference reflects Littelfuse product line variants. Either part is suitable for direct substitution.
Q: Why is PTVS58VP1UP,115 listed as a similar substitute rather than a direct substitute?
A: PTVS58VP1UP,115 uses SOD-128 package instead of DO-214AA (SMB). While electrical specifications are identical, the different package footprint requires PCB redesign. This part is suitable only when layout modification is feasible.
Q: Is SMBJ54CA-TP a valid substitute for 1SMB58AT3?
A: SMBJ54CA-TP is not recommended as a direct substitute. The 54V standoff voltage is 4V lower than the original 58V specification, reducing the protection margin. Use only if circuit analysis confirms the lower voltage rating is acceptable for the application.
Q: What compliance advantage do the active substitutes offer over the obsolete 1SMB58AT3?
A: All active substitute parts are ROHS3 compliant, whereas the original 1SMB58AT3 is RoHS non-compliant. This compliance status is critical for new designs and production in regulated markets. Active product status also ensures long-term availability and supply chain stability.
Q: Which substitute offers the best inventory availability?
A: SMBJ58A-TR (STMicroelectronics) has the highest inventory level at 47,794 pcs, followed by SMBJ58A (Meritek) at 17,400 pcs. Both provide reliable supply for production requirements.
Q: Can I use SMBJ58A-TP for applications requiring the full -65°C to 150°C temperature range?
A: SMBJ58A-TP operates from -55°C to 175°C. While the upper temperature limit exceeds the original specification, the lower limit (-55°C) is 10°C higher than the original (-65°C). For applications requiring operation below -55°C, use SMBJ58A-HR, SMBJ58A-HRA, or verify that the reduced lower temperature limit is acceptable.
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