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P4SMA10CA Equivalent & Substitute Parts
Part Overview
The P4SMA10CA is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with a reverse standoff voltage of 8.55V and provides clamping at 14.5V maximum, with peak pulse current handling of 28.3A. The component is actively produced, RoHS3 compliant, and packaged in DO-214AC (SMA) format on tape and reel. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the TVS diode category.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | P4SMA10CA | — |
| Manufacturer | Littelfuse Inc. | — |
| Category | Transient Voltage Suppressors (TVS) | — |
| Type | Zener | — |
| Bidirectional Channels | 1 | — |
| Voltage - Reverse Standoff (Typ) | 8.55 | V |
| Voltage - Breakdown (Min) | 9.5 | V |
| Voltage - Clamping (Max) @ Ipp | 14.5 | V |
| Current - Peak Pulse (10/1000µs) | 28.3 | A |
| Power - Peak Pulse | 400 | W |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Package / Case | DO-214AC, SMA | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the P4SMA10CA are grouped based on the following electrical and mechanical criteria:
Primary Substitution Criteria:
- Reverse standoff voltage within 8.5V to 8.55V range
- Clamping voltage (Max) @ Ipp between 14.4V and 14.5V
- Peak pulse current (10/1000µs) between 27.7A and 28.3A
- Power dissipation of 400W
- Bidirectional, single-channel Zener TVS diode
- DO-214AC (SMA) package format
- Surface-mount configuration
- RoHS3 compliance
Secondary Consideration:
- Operating temperature range compatibility (minimum -50°C to maximum 150°C acceptable)
Parts meeting these criteria are classified as direct electrical equivalents. Parts with different voltage ratings (such as SMAJ10CA-TP at 10V standoff) or significantly different clamping characteristics (such as SMA6J8.5CA-TR at 18.7V clamp) are listed as alternative options for specific application requirements but do not meet the primary substitution criteria.
Parameter Comparison
| Part Number | Manufacturer | Standoff Voltage (V) | Breakdown Min (V) | Clamp Max @ Ipp (V) | Peak Pulse Current (A) | Power (W) | Temp Range (°C) | RoHS Status |
|---|---|---|---|---|---|---|---|---|
| P4SMA10CA | Littelfuse Inc. | 8.55 | 9.5 | 14.5 | 28.3 | 400 | -65 to 150 | ROHS3 |
| SMAJ8.5CA | MDD | 8.5 | 9.44 | 14.4 | 27.8 | 400 | -50 to 150 | ROHS3 |
| P4SMA10CA | Eaton - Electronics Division | 8.55 | 9.5 | 14.5 | 28.3 | 400 | -55 to 150 | RoHS |
| SMA6J8.5CA-TR | STMicroelectronics | 8.5 | 9.4 | 18.7 | 205 (8/20µs) | 600 | -55 to 175 | ROHS3 |
| SMAJ10CA-TP | Micro Commercial Co | 10 | 11.1 | 17 | 24.6 | 400 | -55 to 175 | ROHS3 |
| SMAJ8.5CA-E3/61 | Vishay General Semiconductor - Diodes Division | 8.5 | 9.44 | 14.4 | 27.8 | 400 | -55 to 150 | ROHS3 |
| SMAJ8.5CA-TP | Micro Commercial Co | 8.5 | 9.44 | 14.4 | 27.7 | 400 | -55 to 175 | ROHS3 |
| SMAJ8.5CA-TR | STMicroelectronics | 8.5 | 9.4 | 19.5 | 124 (8/20µs) | 400 | -55 to 150 | ROHS3 |
Engineering Selection Recommendations
Direct Electrical Equivalents (Primary Substitutes):
SMAJ8.5CA (MDD), SMAJ8.5CA-E3/61 (Vishay), and SMAJ8.5CA-TP (Micro Commercial Co) meet the primary substitution criteria with standoff voltages of 8.5V, clamping voltages of 14.4V, and peak pulse currents between 27.7A and 27.8A. All three are RoHS3 compliant and packaged in DO-214AC (SMA) format. These parts are functionally interchangeable with the P4SMA10CA for general-purpose transient voltage suppression applications.
Alternative Source (Same Manufacturer, Different Division):
P4SMA10CA from Eaton - Electronics Division provides identical electrical specifications to the Littelfuse version (8.55V standoff, 14.5V clamp, 28.3A peak pulse) with RoHS compliance. This option is suitable when Littelfuse supply is constrained.
Alternative Voltage Ratings (Application-Dependent):
SMAJ10CA-TP (Micro Commercial Co) operates at 10V standoff with 17V clamping and 24.6A peak pulse current. This part is suitable only for applications requiring higher voltage protection thresholds.
SMA6J8.5CA-TR (STMicroelectronics) and SMAJ8.5CA-TR (STMicroelectronics) feature higher clamping voltages (18.7V and 19.5V respectively) and significantly higher peak pulse currents (205A and 124A). These parts are suitable for high-energy transient suppression but introduce different electrical characteristics and should be selected only when application requirements specifically demand higher energy handling.
Compliance Considerations:
All listed parts maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity ratings, ensuring compatibility with standard manufacturing and storage practices.
Frequently Asked Questions (FAQ)
Q: Can SMAJ8.5CA parts directly replace P4SMA10CA in my circuit?
A: SMAJ8.5CA variants (from MDD, Vishay, and Micro Commercial Co) are direct electrical equivalents. They share the same 8.5V standoff voltage, 14.4V clamping voltage, and approximately 27.8A peak pulse current. All are packaged in DO-214AC (SMA) format and are RoHS3 compliant. Substitution is valid for general-purpose transient voltage suppression applications.
Q: What is the difference between the 8.5V and 10V standoff voltage parts?
A: The P4SMA10CA operates with an 8.55V reverse standoff voltage, meaning the diode remains non-conducting below this threshold. SMAJ10CA-TP operates at 10V standoff. The higher standoff voltage in SMAJ10CA-TP provides protection at higher voltage levels and is suitable only for applications where the protected circuit operates at higher nominal voltages. Selection depends on the specific overvoltage protection threshold required by your application.
Q: Why do some substitute parts have higher clamping voltages (18.7V, 19.5V)?
A: Parts such as SMA6J8.5CA-TR and SMAJ8.5CA-TR from STMicroelectronics feature higher clamping voltages and significantly higher peak pulse currents (205A and 124A respectively). These characteristics indicate higher energy absorption capability, suitable for applications experiencing high-energy transient events. These parts are not direct equivalents and should be selected only when application requirements specifically demand higher energy handling capacity.
Q: Are all substitute parts RoHS3 compliant?
A: All listed substitute parts are RoHS3 compliant. The P4SMA10CA from Eaton is RoHS compliant (not explicitly ROHS3). All parts maintain MSL 1 (Unlimited) moisture sensitivity ratings.
Q: What is the operating temperature range difference between parts?
A: The P4SMA10CA operates from -65°C to 150°C (TJ). Most substitute parts operate from -55°C to 150°C or -55°C to 175°C. If your application requires operation below -55°C, the P4SMA10CA or equivalent from Littelfuse is required. For standard industrial applications (-55°C to 150°C), all listed parts are suitable.
Q: Can I use SMAJ10CA-TP as a substitute for P4SMA10CA?
A: SMAJ10CA-TP is not a direct equivalent. It operates at 10V standoff voltage (versus 8.55V) and 17V clamping (versus 14.5V), with lower peak pulse current (24.6A versus 28.3A). This part is suitable only for applications requiring higher voltage protection thresholds and is not recommended as a general substitute for the P4SMA10CA.
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