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1SMA64AT3G Equivalent & Substitute Parts
Part Overview
The 1SMA64AT3G 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 64V reverse standoff voltage with 103V maximum clamping voltage and 400W peak pulse power rating in a DO-214AC (SMA) package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 1SMA64AT3G |
| Manufacturer | onsemi |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 64V |
| Voltage - Breakdown (Min) | 71.1V |
| Voltage - Clamping (Max) @ Ipp | 103V |
| Power - Peak Pulse | 400W |
| Package / Case | DO-214AC, SMA |
| Mounting Type | Surface Mount |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution eligibility for the 1SMA64AT3G is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): 64V ± tolerance
- Voltage - Clamping (Max) @ Ipp: 103V (primary criterion)
- Package / Case: DO-214AC (SMA) surface mount
- Unidirectional Channels: 1
- Type: Zener TVS diode
Substitute parts are grouped into two categories:
Direct Substitutes maintain identical electrical specifications across all critical parameters. These parts are pin-compatible and functionally equivalent with no circuit redesign required.
Similar Substitutes maintain the core voltage specifications (64V standoff, 103V clamping) and package compatibility but may vary in secondary parameters such as peak pulse current (Ipp), power dissipation, or operating temperature range. These parts are electrically compatible but require verification of application-specific requirements.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Package / Case | Operating Temperature | Product Status |
|---|---|---|---|---|---|---|---|---|
| 1SMA64AT3G | onsemi | 64V | 103V | — | 400W | DO-214AC, SMA | -65°C ~ 150°C (TJ) | Obsolete |
| SMAJ64A | Meritek | 64V | 103V | 3.88A | 400W | DO-214AC (SMA) | -55°C ~ 150°C | Active |
| P4SMA75A | Eaton - Electronics Division | 64.1V | 103V | 4A | 400W | DO-214AC, SMA | -55°C ~ 150°C (TJ) | Active |
| SMAJ58E3/TR13 | Microchip Technology | 58V | 103V | 4.9A | 500W | DO-214AC, SMA | -65°C ~ 150°C (TJ) | Active |
| SMAJ64A-M3/5A | Vishay General Semiconductor - Diodes Division | 64V | 103V | 3.9A | 400W | DO-214AC, SMA | -55°C ~ 150°C (TJ) | Active |
| SMAJ64A-M3/61 | Vishay General Semiconductor - Diodes Division | 64V | 103V | 3.9A | 400W | DO-214AC, SMA | -55°C ~ 150°C (TJ) | Active |
| SMAJ64A-TP | Micro Commercial Co | 64V | 103V | 3.9A | 400W | DO-214AC, SMA | -55°C ~ 175°C (TA) | Active |
| SMAJ64AE3/TR13 | Microchip Technology | 64V | 103V | 4.9A | 500W | DO-214AC, SMA | -65°C ~ 150°C (TJ) | Active |
| SMAJ64E3/TR13 | Microchip Technology | 64V | 114V | 4.4A | 500W | DO-214AC, SMA | -65°C ~ 150°C (TJ) | Active |
| TV04A640J-G | Comchip Technology | 64V | 103V | 3.88A | 400W | DO-214AC, SMA | -55°C ~ 150°C (TJ) | Active |
Engineering Selection Recommendations
Primary Substitutes (Direct Equivalents):
SMAJ64A (Meritek), SMAJ64A-M3/5A (Vishay), SMAJ64A-M3/61 (Vishay), SMAJ64A-TP (Micro Commercial Co), and TV04A640J-G (Comchip Technology) are functionally equivalent to the 1SMA64AT3G. All maintain 64V reverse standoff voltage, 103V clamping voltage, and DO-214AC (SMA) package compatibility. These parts are active products with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring long-term availability and environmental compliance.
Secondary Substitutes (Electrical Compatibility with Parameter Variations):
SMAJ64AE3/TR13 (Microchip Technology) and SMAJ58E3/TR13 (Microchip Technology) provide enhanced power dissipation (500W vs. 400W) and higher peak pulse current ratings. SMAJ64AE3/TR13 maintains identical voltage specifications to the original part. SMAJ58E3/TR13 operates at a lower 58V reverse standoff voltage and is suitable only for applications where the lower voltage threshold is acceptable.
P4SMA75A (Eaton) maintains 103V clamping voltage with 64.1V standoff voltage and is rated for telecom applications. SMAJ64E3/TR13 (Microchip Technology) features a higher 114V clamping voltage and is suitable for applications requiring increased voltage margin.
All substitute parts are active products with REACH compliance and EAR99 export classification, matching the original part's regulatory status.
Frequently Asked Questions (FAQ)
Q: Can SMAJ64A directly replace 1SMA64AT3G without circuit modification?
A: Yes. SMAJ64A maintains identical reverse standoff voltage (64V), clamping voltage (103V), power rating (400W), and DO-214AC (SMA) package. No circuit redesign is required.
Q: What is the difference between SMAJ64A-M3/5A and SMAJ64A-M3/61?
A: Both parts are manufactured by Vishay and maintain identical electrical specifications (64V standoff, 103V clamping, 3.9A peak pulse current, 400W power). The designations indicate different tape and reel configurations or manufacturing date codes. Electrical performance is equivalent.
Q: Why does SMAJ58E3/TR13 have a lower reverse standoff voltage (58V vs. 64V)?
A: SMAJ58E3/TR13 is a different voltage rating within the SMAJ series. While it maintains the same 103V clamping voltage, the lower standoff voltage makes it suitable only for circuits designed for 58V protection thresholds. Use only if your application specifies this lower voltage rating.
Q: Is SMAJ64E3/TR13 compatible with the original 1SMA64AT3G?
A: SMAJ64E3/TR13 maintains the 64V reverse standoff voltage and DO-214AC (SMA) package but features a higher 114V clamping voltage (vs. 103V). This higher clamping voltage may affect circuit performance in applications with tight voltage margin requirements. Verify compatibility with your circuit design.
Q: What does the higher peak pulse current (4.9A in Microchip parts vs. 3.88A in Meritek) mean for substitution?
A: Higher peak pulse current indicates the part can handle greater transient energy. This is a beneficial characteristic for substitution, as it provides additional margin. No circuit modification is required.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the environmental compliance of the original 1SMA64AT3G.
Q: Can I use P4SMA75A in a general-purpose application, or is it limited to telecom?
A: P4SMA75A is rated for telecom applications but maintains the same electrical specifications (64.1V standoff, 103V clamping, 400W power) as the original part. It is electrically compatible with general-purpose circuits. The telecom rating indicates additional qualification testing; general-purpose use is acceptable.
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