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1SMA5.0AT3G Equivalent & Substitute Parts
Part Overview
The 1SMA5.0AT3G is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component features a 5V reverse standoff voltage with a 9.2V maximum clamping voltage and 44.6A peak pulse current capability in the DO-214AC (SMA) package. The part is currently classified as obsolete, necessitating identification of active equivalent alternatives that maintain identical electrical and mechanical specifications for continued circuit protection functionality.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 1SMA5.0AT3G |
| Manufacturer | Littelfuse Inc. |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 5V |
| Voltage - Breakdown (Min) | 6.4V |
| Voltage - Clamping (Max) @ Ipp | 9.2V |
| Current - Peak Pulse (10/1000µs) | 44.6A |
| Power - Peak Pulse | 400W |
| Package / Case | DO-214AC, SMA |
| Mounting Type | Surface Mount |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitute parts for the 1SMA5.0AT3G are classified into two functional groups based on electrical parameter alignment:
Group 1: Direct Electrical Equivalents (5V Standoff, 9.2V Clamp, 44.6A Peak Pulse)
These parts maintain identical voltage ratings and peak pulse current specifications as the original 1SMA5.0AT3G:
- Voltage - Reverse Standoff (Typ): 5V
- Voltage - Breakdown (Min): 6.4V
- Voltage - Clamping (Max) @ Ipp: 9.2V
- Current - Peak Pulse (10/1000µs): 44.6A
- Power - Peak Pulse: 400W
- Package / Case: DO-214AC, SMA
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
Group 2: Higher Performance Alternatives (5V Standoff, 13.4V Clamp, Elevated Peak Pulse)
These parts share the same 5V reverse standoff voltage and DO-214AC package but provide enhanced transient suppression capability through higher clamping voltage and increased peak pulse current ratings. Selection from this group requires circuit validation to confirm compatibility with the higher clamping voltage threshold.
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 | Operating Temperature | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| 1SMA5.0AT3G | Littelfuse Inc. | 5V | 6.4V | 9.2V | 44.6A | 400W | -65°C ~ 150°C (TJ) | Obsolete | ROHS3 Compliant |
| SMAJ5.0A | MDD | 5V | 6.4V | 9.2V | 44.6A | 400W | -50°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMAJ5.0A-13-F | Diodes Incorporated | 5V | 6.4V | 9.2V | 44.6A | 400W | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMAJ5.0A-E3/5A | Vishay General Semiconductor - Diodes Division | 5V | 6.4V | 9.2V | 44.6A | 400W | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMAJ5.0A-E3/61 | Vishay General Semiconductor - Diodes Division | 5V | 6.4V | 9.2V | 44.6A | 400W | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMAJ5.0A-M3/5A | Vishay General Semiconductor - Diodes Division | 5V | 6.4V | 9.2V | 44.6A | 400W | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMAJ5.0A-M3/61 | Vishay General Semiconductor - Diodes Division | 5V | 6.4V | 9.2V | 44.6A | 400W | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMAJ5.0A-TP | Micro Commercial Co | 5V | 6.4V | 9.2V | 44.6A | 400W | -55°C ~ 175°C (TA) | Active | ROHS3 Compliant |
| SM4T6V7AY | STMicroelectronics | 5V | 6.4V | 13.4V | 174A (8/20µs) | 400W | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMA6J5.0A-E3/5A | Vishay General Semiconductor - Diodes Division | 5V | 6.4V | 13.4V | 298A (8/20µs) | 4000W (4kW) | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Replacement (Group 1 - Identical Electrical Performance)
For applications requiring exact electrical equivalence to the 1SMA5.0AT3G, select from active parts with matching 5V standoff, 9.2V clamping voltage, and 44.6A peak pulse specifications. All Group 1 alternatives are ROHS3 compliant and carry active product status, ensuring long-term supply availability and manufacturing consistency.
SMAJ5.0A-E3/61 (Vishay) and SMAJ5.0A-M3/61 (Vishay) offer the highest inventory levels (95,100 and 20,400 units respectively) among direct equivalents. SMAJ5.0A-13-F (Diodes Incorporated) provides an alternative source with 35,100 units in stock. SMAJ5.0A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, suitable for elevated ambient applications.
Higher Performance Alternative (Group 2 - Enhanced Transient Suppression)
SM4T6V7AY (STMicroelectronics) and SMA6J5.0A-E3/5A (Vishay) maintain the 5V standoff voltage while providing 13.4V clamping and significantly higher peak pulse current ratings. These parts are suitable only when circuit design permits the higher clamping voltage threshold. SM4T6V7AY carries AEC-Q101 automotive qualification. SMA6J5.0A-E3/5A delivers 4kW peak pulse power versus 400W in the original specification.
All recommended substitutes maintain DO-214AC (SMA) package compatibility, surface-mount configuration, and ROHS3 compliance with the original 1SMA5.0AT3G.
Frequently Asked Questions (FAQ)
Q: Can SMAJ5.0A-E3/61 directly replace 1SMA5.0AT3G in existing designs?
A: Yes. SMAJ5.0A-E3/61 maintains identical voltage ratings (5V standoff, 9.2V clamp), peak pulse current (44.6A), and DO-214AC package footprint. The operating temperature range (-55°C to 150°C) covers the original specification. No circuit modifications are required.
Q: What is the difference between SMAJ5.0A variants (E3/5A, E3/61, M3/5A, M3/61)?
A: These designations indicate packaging and tape configuration variants. E3 and M3 refer to different tape formats (Cut Tape & Digi-Reel vs. Tape & Reel). The /5A and /61 suffixes denote specific packaging specifications. All variants maintain identical electrical performance and are electrically interchangeable.
Q: Why do SM4T6V7AY and SMA6J5.0A-E3/5A have higher clamping voltages?
A: These parts are higher-performance alternatives with 13.4V clamping voltage versus 9.2V in the original. They provide enhanced transient suppression capability but require circuit validation to confirm the higher clamping threshold does not exceed downstream component voltage ratings.
Q: Is SMAJ5.0A-TP suitable for high-temperature applications?
A: SMAJ5.0A-TP extends the upper operating temperature to 175°C (ambient), compared to 150°C (junction) in other alternatives. This makes it suitable for applications in elevated thermal environments, provided other electrical specifications remain compatible.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the original 1SMA5.0AT3G specification.
Q: What inventory considerations apply to these substitutes?
A: SMAJ5.0A-E3/61 (Vishay) offers the largest active inventory at 95,100 units. SMAJ5.0A-13-F (Diodes) provides 35,100 units. Smaller inventory levels exist for specialized variants. Verify current availability with your supplier for production requirements.
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