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P4SMA75 Equivalent & Substitute Parts
Part Overview
The P4SMA75 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 64.1V reverse standoff voltage, 108.15V maximum clamping voltage, and 4A peak pulse current capability in a DO-214AC (SMA) package. The part is currently obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | P4SMA75 |
| Manufacturer | Littelfuse Inc. |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 64.1V |
| Voltage - Breakdown (Min) | 67.74V |
| Voltage - Clamping (Max) @ Ipp | 108.15V |
| Current - Peak Pulse (10/1000µs) | 4A |
| Power - Peak Pulse | 400W |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AC, SMA |
| Product Status | Obsolete |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the P4SMA75 is determined by the following critical electrical and mechanical parameters:
- Reverse Standoff Voltage (Typ): Must remain within the 64.1V specification to maintain circuit protection thresholds
- Voltage - Clamping (Max) @ Ipp: Must not exceed 108.15V to ensure adequate transient suppression
- Current - Peak Pulse (10/1000µs): Must support minimum 4A pulse current capability
- Power - Peak Pulse: Must maintain 400W dissipation rating
- Package / Case: Must be DO-214AC (SMA) for mechanical and thermal compatibility
- Mounting Type: Surface mount configuration required
- Operating Temperature Range: Must support -65°C to 150°C minimum
Substitute parts are grouped into two categories based on electrical performance alignment with the original P4SMA75 specification.
Parameter Comparison
| Part Number | Manufacturer | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current (A) | Power Peak Pulse (W) | Temp Range (°C) | Package | Status |
|---|---|---|---|---|---|---|---|---|---|
| P4SMA75 | Littelfuse Inc. | 64.1 | 67.74 | 108.15 | 4 | 400 | -65 ~ 150 | DO-214AC (SMA) | Obsolete |
| P4SMA75A | Eaton - Electronics Division | 64.1 | 71.3 | 103 | 4 | 400 | -55 ~ 150 | DO-214AC (SMA) | Active |
| SMAJ64A | Meritek | 64 | 71.1 | 103 | 3.88 | 400 | -55 ~ 150 | DO-214AC (SMA) | Active |
| SMAJ70A | MDD | 70 | 77.8 | 113 | 4.6 | 400 | -50 ~ 150 | DO-214AC (SMA) | Active |
| SMAJ75A | MDD | 75 | 83.3 | 121 | 3.3 | 400 | -50 ~ 150 | DO-214AC (SMA) | Active |
| SMAJ58E3/TR13 | Microchip Technology | 58 | 64.4 | 103 | 4.9 | 500 | -65 ~ 150 | DO-214AC (SMA) | Active |
| SMAJ64AE3/TR13 | Microchip Technology | 64 | 71.1 | 103 | 4.9 | 500 | -65 ~ 150 | DO-214AC (SMA) | Active |
| SMAJ70A-M3/5A | Vishay General Semiconductor - Diodes Division | 70 | 77.8 | 113 | 4.6 | 400 | -55 ~ 150 | DO-214AC (SMA) | Active |
| SMAJ75A-M3/61 | Vishay General Semiconductor - Diodes Division | 75 | 83.3 | 121 | 3.3 | 400 | -55 ~ 150 | DO-214AC (SMA) | Active |
Engineering Selection Recommendations
Primary Substitute: P4SMA75A (Eaton - Electronics Division)
The P4SMA75A provides the closest electrical alignment to the P4SMA75 specification. It maintains the identical 64.1V reverse standoff voltage and 4A peak pulse current rating. The clamping voltage is reduced to 103V (versus 108.15V), which provides improved transient suppression performance. This part is active in production with RoHS compliance and unlimited moisture sensitivity rating. The operating temperature range is -55°C to 150°C, which covers most industrial applications; however, designs requiring -65°C operation must account for this limitation.
Secondary Substitutes: SMAJ64A and SMAJ64AE3/TR13
Both parts maintain the 64V reverse standoff voltage specification and 103V clamping voltage. The SMAJ64A (Meritek) offers 3.88A peak pulse current and is widely available. The SMAJ64AE3/TR13 (Microchip Technology) provides enhanced performance with 4.9A peak pulse current and 500W power dissipation, supporting extended temperature operation from -65°C to 150°C. Both are ROHS3 compliant and suitable for general-purpose applications.
Alternative Substitutes: SMAJ70A and SMAJ75A Series
These parts feature higher reverse standoff voltages (70V and 75V respectively) and correspondingly higher clamping voltages (113V and 121V). Selection of these alternatives is appropriate only when circuit design permits higher voltage thresholds. The SMAJ70A-M3/5A (Vishay) and SMAJ75A-M3/61 (Vishay) are TransZorb® series components with active production status and full compliance certifications.
Extended Temperature Operation: SMAJ58E3/TR13
For applications requiring the full -65°C to 150°C operating range with enhanced current handling (4.9A) and power dissipation (500W), the SMAJ58E3/TR13 (Microchip Technology) is suitable. This part operates at a lower 58V reverse standoff voltage and should be selected only when circuit protection thresholds permit this reduction.
Frequently Asked Questions (FAQ)
Q: Can I use P4SMA75A as a direct replacement for P4SMA75?
A: Yes. The P4SMA75A maintains the same reverse standoff voltage (64.1V) and peak pulse current (4A) as the original P4SMA75. The clamping voltage is slightly lower (103V versus 108.15V), which improves transient suppression. The primary consideration is the reduced operating temperature minimum of -55°C versus -65°C on the original part.
Q: What is the difference between SMAJ64A and SMAJ64AE3/TR13?
A: Both parts maintain 64V reverse standoff voltage and 103V clamping voltage. The SMAJ64AE3/TR13 provides higher peak pulse current (4.9A versus 3.88A) and power dissipation (500W versus 400W). Additionally, the Microchip part supports the full -65°C to 150°C temperature range, while the Meritek SMAJ64A operates from -55°C to 150°C.
Q: Why do SMAJ70A and SMAJ75A have higher clamping voltages?
A: These parts are designed with higher reverse standoff voltages (70V and 75V respectively) to protect circuits operating at higher voltage levels. The clamping voltage scales proportionally with the standoff voltage. These substitutes are appropriate only when your circuit design permits operation at these higher protection thresholds.
Q: Are all substitute parts available in the same DO-214AC (SMA) package?
A: Yes. All listed substitute parts use the DO-214AC (SMA) surface-mount package, ensuring mechanical and thermal compatibility with the original P4SMA75 footprint.
Q: Which substitute offers the best low-temperature performance?
A: The SMAJ58E3/TR13 and SMAJ64AE3/TR13 (both Microchip Technology) support operation down to -65°C, matching the original P4SMA75 specification. All other substitutes operate from -50°C or -55°C minimum.
Q: What is the RoHS compliance status of these substitutes?
A: All listed substitute parts are ROHS3 compliant or RoHS compliant, meeting current environmental regulations. Moisture sensitivity level is 1 (Unlimited) across all parts, indicating no special handling requirements during storage or assembly.
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