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1SMA58AT3G Equivalent & Substitute Parts
Part Overview
The 1SMA58AT3G is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse, 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 at 4.3A peak pulse current. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 58V |
| Voltage - Breakdown (Min) | 64.4V |
| Voltage - Clamping (Max) @ Ipp | 93.6V |
| Current - Peak Pulse (10/1000µs) | 4.3A |
| Power - Peak Pulse | 400W |
| Package / Case | DO-214AC, SMA |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the 1SMA58AT3G is determined by the following critical electrical and mechanical parameters:
- Voltage - Reverse Standoff: 58V (exact match required)
- Voltage - Breakdown (Min): 64.4V (exact match required)
- Voltage - Clamping (Max) @ Ipp: 93.6V (exact match required)
- Current - Peak Pulse (10/1000µs): 4.3A (exact match required)
- Power - Peak Pulse: 400W (exact match required)
- Package / Case: DO-214AC, SMA (exact match required)
- Mounting Type: Surface Mount (exact match required)
Substitute parts are grouped into two categories:
Category 1: Direct Electrical & Mechanical Equivalents – Parts with identical electrical specifications and package configuration. These parts are fully interchangeable with the 1SMA58AT3G.
Category 2: Functional Equivalents with Parameter Variations – Parts that maintain the core 58V standoff voltage and DO-214AC/SMA package but feature different clamping voltages or peak pulse currents. These parts are suitable only when the application can tolerate the specified parameter deviations.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Package / Case | Product Status | Operating Temperature |
|---|---|---|---|---|---|---|---|---|---|
| 1SMA58AT3G | Littelfuse | 58V | 64.4V | 93.6V | 4.3A | 400W | DO-214AC, SMA | Obsolete | -65°C ~ 150°C (TJ) |
| SMAJ58A | MDD | 58V | 64.4V | 93.6V | 4.3A | 400W | DO-214AC, SMA | Active | -50°C ~ 150°C (TJ) |
| SMAJ58A-13-F | Diodes Incorporated | 58V | 64.4V | 93.6V | 4.3A | 400W | DO-214AC, SMA | Active | -55°C ~ 150°C (TJ) |
| SMAJ58A-E3/61 | Vishay General Semiconductor - Diodes Division | 58V | 64.4V | 93.6V | 4.3A | 400W | DO-214AC, SMA | Active | -55°C ~ 150°C (TJ) |
| SMAJ58A-M3/5A | Vishay General Semiconductor - Diodes Division | 58V | 64.4V | 93.6V | 4.3A | 400W | DO-214AC, SMA | Active | -55°C ~ 150°C (TJ) |
| SMAJ58A-M3/61 | Vishay General Semiconductor - Diodes Division | 58V | 64.4V | 93.6V | 4.3A | 400W | DO-214AC, SMA | Active | -55°C ~ 150°C (TJ) |
| SMAJ58A-TP | Micro Commercial Co | 58V | 64.4V | 93.6V | 4.3A | 400W | DO-214AC, SMA | Active | -55°C ~ 175°C (TA) |
| SMAJ58A-TR | STMicroelectronics | 58V | 64.4V | 93.6V | 4.3A | 400W | DO-214AC, SMA | Active | -55°C ~ 150°C (TJ) |
| SM4T68AY | STMicroelectronics | 58V | 64.4V | 121V | 19A (8/20µs) | 400W | DO-214AC, SMA | Active | -55°C ~ 150°C (TJ) |
| SMA6J58A-TR | STMicroelectronics | 58V | 64.4V | 100V | 33A (8/20µs) | 600W | DO-214AC, SMA | Active | -55°C ~ 175°C (TJ) |
Engineering Selection Recommendations
Direct Equivalents (Recommended for 1:1 Replacement)
SMAJ58A-13-F (Diodes Incorporated), SMAJ58A-E3/61 (Vishay), SMAJ58A-M3/5A (Vishay), SMAJ58A-M3/61 (Vishay), SMAJ58A-TP (Micro Commercial Co), and SMAJ58A-TR (STMicroelectronics) are direct electrical and mechanical equivalents. All maintain identical voltage specifications (58V standoff, 64.4V breakdown, 93.6V clamping) and 4.3A peak pulse current in the DO-214AC/SMA package. These parts are ROHS3 compliant with MSL 1 rating. Selection among these equivalents should be based on product availability, packaging format (tape & reel vs. cut tape), and supply chain requirements.
Functional Alternatives with Parameter Deviations
SMAJ58A (MDD) is electrically equivalent but operates over a narrower temperature range (-50°C to 150°C vs. -65°C to 150°C). This part is suitable only when the application does not require the extended low-temperature performance of the original design.
SM4T68AY (STMicroelectronics) maintains the 58V standoff voltage but features a higher clamping voltage (121V) and significantly higher peak pulse current (19A at 8/20µs). This part is suitable only for applications where higher transient energy absorption is acceptable and the elevated clamping voltage does not compromise circuit protection requirements.
SMA6J58A-TR (STMicroelectronics) maintains the 58V standoff voltage but features a higher clamping voltage (100V), substantially higher peak pulse current (33A at 8/20µs), and increased power dissipation (600W). This part is suitable only for high-energy transient environments where the original 4.3A specification is insufficient.
Frequently Asked Questions (FAQ)
Q: Can SMAJ58A-13-F be used as a direct replacement for 1SMA58AT3G?
A: Yes. SMAJ58A-13-F matches all critical electrical parameters (58V standoff, 64.4V breakdown, 93.6V clamping, 4.3A peak pulse) and package configuration (DO-214AC/SMA). Both are ROHS3 compliant with MSL 1 rating. The primary difference is product status: 1SMA58AT3G is obsolete while SMAJ58A-13-F is active.
Q: What is the difference between SMAJ58A-M3/61 and SMAJ58A-E3/61?
A: Both parts are manufactured by Vishay and share identical electrical specifications. The difference lies in packaging format: SMAJ58A-M3/61 is supplied in tape & reel (TR) format, while SMAJ58A-E3/61 is supplied in cut tape (CT) & Digi-Reel format. Electrical performance and compatibility are equivalent.
Q: Can SM4T68AY replace 1SMA58AT3G in all applications?
A: No. While SM4T68AY maintains the 58V standoff voltage and DO-214AC/SMA package, it features a significantly higher clamping voltage (121V vs. 93.6V) and peak pulse current (19A vs. 4.3A). This part is suitable only for applications where higher transient energy absorption is required and the elevated clamping voltage does not interfere with circuit operation.
Q: What does "obsolete" status mean for 1SMA58AT3G?
A: Obsolete status indicates that Littelfuse has discontinued manufacturing and support for this part. Direct equivalents with active status (such as SMAJ58A-13-F, SMAJ58A-E3/61, SMAJ58A-M3/61, and SMAJ58A-TR) are recommended for new designs and ongoing procurement.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity level), matching the compliance profile of the original 1SMA58AT3G.
Q: What is the significance of the temperature range difference between SMAJ58A (MDD) and other equivalents?
A: SMAJ58A (MDD) operates from -50°C to 150°C, while most other equivalents operate from -55°C to 150°C. The original 1SMA58AT3G operates from -65°C to 150°C. If the application requires operation below -50°C, SMAJ58A (MDD) is not suitable. Other listed equivalents support operation down to -55°C.
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