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SMAJ7.5A-M3/5A Equivalent & Substitute Parts
Part Overview
The SMAJ7.5A-M3/5A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the DO-214AC (SMA) package and provides transient voltage protection for general-purpose applications. The part is Active status and RoHS3 compliant, making it suitable for modern electronic designs requiring ESD and surge protection.
Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when alternative manufacturers offer equivalent electrical and mechanical specifications within the same packaging standard.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 7.5 | V |
| Voltage - Breakdown (Min) | 8.33 | V |
| Voltage - Clamping (Max) @ Ipp | 12.9 | V |
| Current - Peak Pulse (10/1000µs) | 31 | A |
| Power - Peak Pulse | 400 | W |
| Operating Temperature Range | -55 to 150 | °C |
| Package / Case | DO-214AC, SMA | - |
| Mounting Type | Surface Mount | - |
| Type | Zener | - |
| Unidirectional Channels | 1 | - |
Substitute Part Grouping Explanation
Substitution of the SMAJ7.5A-M3/5A is determined by strict equivalence across the following critical parameters:
- Voltage - Reverse Standoff (Typ): 7.5V
- Voltage - Breakdown (Min): 8.33V
- Voltage - Clamping (Max) @ Ipp: 12.9V
- Current - Peak Pulse (10/1000µs): 31A (±0.01A tolerance acceptable)
- Power - Peak Pulse: 400W
- Package / Case: DO-214AC, SMA
- Mounting Type: Surface Mount
- Type: Zener, Unidirectional (1 channel)
All identified substitute parts meet these electrical specifications. Packaging format differences (Tape & Reel vs. Cut Tape) do not affect electrical compatibility and represent only supply chain variations.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown (V) | Voltage - Clamping (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Package | Packaging Format | Operating Temperature (°C) | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| SMAJ7.5A-M3/5A | Vishay General Semiconductor - Diodes Division | 7.5 | 8.33 | 12.9 | 31 | 400 | DO-214AC, SMA | Tape & Reel (TR) | -55 to 150 | ROHS3 Compliant |
| SMAJ7.5A-E3/61 | Vishay General Semiconductor - Diodes Division | 7.5 | 8.33 | 12.9 | 31 | 400 | DO-214AC, SMA | Cut Tape (CT) | -55 to 150 | ROHS3 Compliant |
| SMAJ7.5A | Meritek | 7.5 | 8.33 | 12.9 | 31.01 | 400 | DO-214AC, SMA | Tape & Reel (TR) | -55 to 150 | ROHS3 Compliant |
| SMAJ7.5A-13-F | Diodes Incorporated | 7.5 | 8.33 | 12.9 | 31 | 400 | DO-214AC, SMA | Tape & Reel (TR) | -55 to 150 | ROHS3 Compliant |
| SMAJ7.5A-TP | Micro Commercial Co | 7.5 | 8.33 | 12.9 | 31 | 400 | DO-214AC, SMA | Tape & Reel (TR) | -55 to 175 | ROHS3 Compliant |
Engineering Selection Recommendations
All substitute parts listed maintain electrical equivalence to the SMAJ7.5A-M3/5A across voltage, current, and power specifications. Selection among substitutes should be based on:
Manufacturer Availability: SMAJ7.5A-E3/61 (Vishay) offers the highest inventory (36,100 pcs) and maintains identical specifications with Cut Tape packaging. SMAJ7.5A-TP (Micro Commercial Co) provides extended operating temperature range to 175°C, suitable for applications requiring higher thermal margins.
Compliance Status: All substitute parts are RoHS3 compliant and REACH unaffected, meeting modern regulatory requirements.
Packaging Format: Tape & Reel (TR) format is standard for automated assembly. Cut Tape (CT) format is suitable for manual or low-volume assembly operations.
Temperature Performance: SMAJ7.5A-TP extends the upper operating temperature to 175°C compared to 150°C for other variants, providing additional thermal headroom in high-temperature environments.
Frequently Asked Questions (FAQ)
Q: Can SMAJ7.5A-E3/61 replace SMAJ7.5A-M3/5A in production?
A: Yes. Both parts are electrically identical with matching voltage (7.5V standoff, 12.9V clamping) and current (31A peak pulse) specifications. The difference is packaging format: SMAJ7.5A-E3/61 uses Cut Tape while SMAJ7.5A-M3/5A uses Tape & Reel. Assembly equipment compatibility should be verified.
Q: What is the difference between Meritek SMAJ7.5A and Vishay SMAJ7.5A-M3/5A?
A: Both parts meet the same electrical specifications (7.5V standoff, 12.9V clamping, 31A peak pulse). The Meritek variant shows 31.01A peak pulse, which is within acceptable tolerance. Manufacturer differences may affect lead time and supply availability.
Q: Is SMAJ7.5A-TP suitable for high-temperature applications?
A: SMAJ7.5A-TP operates to 175°C junction temperature, compared to 150°C for the primary part. This extended range makes it suitable for applications with elevated ambient or junction temperatures, provided other thermal management considerations are addressed.
Q: Are all substitute parts in the same DO-214AC package?
A: Yes. All substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical and footprint compatibility with the original design.
Q: What compliance certifications apply to these parts?
A: All parts are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.
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