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S1MA-E3/5AT Equivalent & Substitute Parts
Part Overview
The S1MA-E3/5AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 1000 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This part is classified as obsolete, indicating it has been discontinued and is no longer recommended for new designs. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support existing production requirements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - DC Reverse (Vr) (Max) | 1000 | V |
| Current - Average Rectified (Io) | 1 | A |
| Voltage - Forward (Vf) (Max) @ If | 1.1 @ 1 A | V |
| Reverse Recovery Time (trr) | 1 | µs |
| Current - Reverse Leakage @ Vr | 3 | µA @ 1000 V |
| Capacitance @ Vr, F | 8 | pF @ 4V, 1MHz |
| Package / Case | DO-214AC, SMA | |
| Operating Temperature - Junction | -55 to 150 | °C |
| Mounting Type | Surface Mount |
Substitute Part Grouping Explanation
Substitution of the S1MA-E3/5AT is determined by the following critical parameters:
Primary Substitution Criteria:
- Voltage - DC Reverse (Vr) (Max): 1000 V
- Current - Average Rectified (Io): 1 A
- Package / Case: DO-214AC, SMA
- Mounting Type: Surface Mount
- Operating Temperature Range: -55°C to 150°C (minimum)
Secondary Compatibility Factors:
- Voltage - Forward (Vf) (Max) @ If: ≤ 1.1 V @ 1 A
- Reverse Recovery Time (trr): ≤ 1.8 µs
- Current - Reverse Leakage @ Vr: ≤ 10 µA @ 1000 V
- Capacitance @ Vr, F: ≤ 15 pF @ 4V, 1MHz
Substitute parts are grouped into three categories: Vishay parametric equivalents (same base product family with different packaging or tape specifications), alternative manufacturer direct equivalents (Micro Commercial Co and onsemi), and automotive-qualified variants (AEC-Q100 and AEC-Q101 certified).
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Vr (Max) [V] | Io [A] | Vf (Max) @ If [V] | trr [µs] | Ir @ Vr [µA] | Package | Product Status | Packaging Type |
|---|---|---|---|---|---|---|---|---|---|
| S1MA-E3/5AT | Vishay | 1000 | 1 | 1.1 @ 1 A | 1 | 3 @ 1000 V | DO-214AC | Obsolete | Cut Tape |
| S1M-E3/5AT | Vishay | 1000 | 1 | 1.1 @ 1 A | 1.8 | 5 @ 1000 V | DO-214AC | Active | Cut Tape & Digi-Reel |
| S1M-E3/61T | Vishay | 1000 | 1 | 1.1 @ 1 A | 1.8 | 5 @ 1000 V | DO-214AC | Active | Cut Tape & Digi-Reel |
| S1M-M3/5AT | Vishay | 1000 | 1 | 1.1 @ 1 A | 1.8 | 5 @ 1000 V | DO-214AC | Active | Tape & Reel |
| S1M-M3/61T | Vishay | 1000 | 1 | 1.1 @ 1 A | 1.8 | 5 @ 1000 V | DO-214AC | Active | Tape & Reel |
| S1MHE3_A/H | Vishay | 1000 | 1 | 1.1 @ 1 A | 1.8 | 5 @ 1000 V | DO-214AC | Active | Cut Tape & Digi-Reel |
| S1MHE3_A/I | Vishay | 1000 | 1 | 1.1 @ 1 A | 1.8 | 5 @ 1000 V | DO-214AC | Active | Tape & Reel |
| S1MHM3_A/H | Vishay | 1000 | 1 | 1.1 @ 1 A | 1.8 | 5 @ 1000 V | DO-214AC | Active | Cut Tape & Digi-Reel |
| S1MHM3_A/I | Vishay | 1000 | 1 | 1.1 @ 1 A | 1.8 | 5 @ 1000 V | DO-214AC | Active | Cut Tape & Digi-Reel |
| GS1M-LTP | Micro Commercial Co | 1000 | 1 | 1 @ 1 A | Not specified | 10 @ 1000 V | DO-214AC | Active | Cut Tape & Digi-Reel |
| GF1M | onsemi | 1000 | 1 | 1.2 @ 1 A | 2 | 5 @ 1000 V | DO-214AC | Not For New Designs | Cut Tape & Digi-Reel |
Engineering Selection Recommendations
Primary Recommendation - Vishay Active Equivalents:
The S1M series parts (S1M-E3/5AT, S1M-E3/61T, S1M-M3/5AT, S1M-M3/61T) are direct parametric equivalents manufactured by Vishay and maintain active product status. These parts satisfy all electrical requirements of the obsolete S1MA-E3/5AT. Selection between these variants depends on packaging requirements: Cut Tape & Digi-Reel packaging (E3/5AT, E3/61T) or Tape & Reel packaging (M3/5AT, M3/61T).
Automotive-Qualified Alternatives:
For applications requiring automotive qualification, the S1MHE3_A/H, S1MHE3_A/I, S1MHM3_A/H, and S1MHM3_A/I variants are available with AEC-Q100 or AEC-Q101 certification. These maintain identical electrical specifications while providing automotive-grade reliability assurance.
Alternative Manufacturer Options:
GS1M-LTP (Micro Commercial Co) provides an active alternative with equivalent voltage and current ratings. The forward voltage is lower (1 V vs. 1.1 V), which may provide marginal performance benefits in certain applications.
GF1M (onsemi) is classified as "Not For New Designs" and should not be selected for new applications despite active inventory status.
Compliance Status:
All recommended substitute parts maintain ROHS3 compliance, unlimited moisture sensitivity level (MSL 1), and REACH unaffected status, matching the original part's regulatory profile.
Frequently Asked Questions (FAQ)
Q: Can S1M-E3/5AT directly replace S1MA-E3/5AT?
A: Yes. The S1M-E3/5AT is a parametric equivalent with identical voltage (1000 V), current (1 A), forward voltage (1.1 V @ 1 A), and package (DO-214AC). The primary difference is product status (Active vs. Obsolete) and reverse recovery time (1.8 µs vs. 1 µs). The slightly longer recovery time does not affect compatibility in standard rectification applications.
Q: What is the difference between S1M-E3/5AT and S1M-M3/5AT?
A: Both parts are electrically identical. The difference is packaging: S1M-E3/5AT is supplied in Cut Tape & Digi-Reel format, while S1M-M3/61T is supplied in Tape & Reel format. Selection depends on assembly equipment and procurement requirements.
Q: Are automotive-qualified variants (S1MHE3_A/H, S1MHM3_A/H) suitable for non-automotive applications?
A: Yes. Automotive-qualified parts exceed standard requirements and are fully compatible with non-automotive applications. They provide additional reliability assurance at potentially higher cost.
Q: Why is GF1M marked "Not For New Designs"?
A: GF1M is an onsemi product in legacy status. While electrically compatible, it should not be selected for new designs due to its discontinued development status. Active alternatives from Vishay are preferred.
Q: What is the significance of the reverse recovery time difference (1 µs vs. 1.8 µs)?
A: Reverse recovery time affects switching speed in high-frequency applications. The S1MA-E3/5AT has faster recovery (1 µs). For standard 50/60 Hz rectification and most DC power supply applications, the 1.8 µs recovery time of S1M equivalents is acceptable. Applications requiring faster switching should evaluate circuit performance.
Q: Can GS1M-LTP from Micro Commercial Co be used as a direct substitute?
A: GS1M-LTP meets all primary electrical requirements (1000 V, 1 A, DO-214AC package). The forward voltage is lower (1 V vs. 1.1 V), which is advantageous. However, reverse leakage current is higher (10 µA vs. 3-5 µA), and reverse recovery time is not specified. Verify circuit compatibility before selection.
Q: Are all substitute parts ROHS3 compliant?
A: Yes. All recommended substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original S1MA-E3/5AT.
Q: What packaging options are available for active Vishay equivalents?
A: Vishay offers four active variants: S1M-E3/5AT and S1M-E3/61T in Cut Tape & Digi-Reel format, and S1M-M3/5AT and S1M-M3/61T in Tape & Reel format. The suffix designates tape specifications (5AT vs. 61T). Consult packaging documentation for specific reel configurations.
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