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P4SMA10C Equivalent & Substitute Parts
Part Overview
The P4SMA10C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a reverse standoff voltage of 8.55V and provides clamping at 15.23V with a peak pulse current capability of 28.3A. The P4SMA10C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while meeting modern RoHS compliance standards.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 8.55 | V |
| Voltage - Breakdown (Min) | 9.03 | V |
| Voltage - Clamping (Max) @ Ipp | 15.23 | 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 | - |
Substitute Part Grouping Explanation
Substitute parts for the P4SMA10C are selected based on the following critical electrical parameters:
- Voltage - Reverse Standoff (Typ): 8.5V to 8.55V
- Voltage - Clamping (Max) @ Ipp: 14.4V to 19.5V
- Current - Peak Pulse (10/1000µs): 27.7A to 124A
- Power - Peak Pulse: 400W to 600W
- Package / Case: DO-214AC, SMA (surface mount)
- Bidirectional Channels: 1
- Type: Zener
Substitutes are grouped into two categories based on clamping voltage performance:
Group A (Lower Clamping Voltage: 14.4V to 14.5V): P4SMA10CA, SMAJ8.5CA, SMAJ8.5CA-E3/61, SMAJ8.5CA-TP, SMAJ8.5CA-TR, SMAJP4KE10CA-TP. These parts maintain the same reverse standoff voltage and peak pulse current as the original part while providing slightly lower clamping voltages.
Group B (Higher Clamping Voltage: 18.7V to 19.5V): SM4T10CAY, SMA6J8.5CA-TR, SMAJ8.5CA-TR. These parts provide enhanced transient suppression with higher clamping voltages and increased peak pulse current capabilities, suitable for applications requiring more aggressive overvoltage protection.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Operating Temperature | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|
| P4SMA10C | Littelfuse Inc. | 8.55V | 9.03V | 15.23V | 28.3A | 400W | -65 to 150°C | Obsolete | ROHS3 Compliant |
| P4SMA10CA | Eaton - Electronics Division | 8.55V | 9.5V | 14.5V | 28.3A | 400W | -55 to 150°C | Active | RoHS Compliant |
| SMAJ8.5CA | MDD | 8.5V | 9.44V | 14.4V | 27.8A | 400W | -50 to 150°C | Active | ROHS3 Compliant |
| SMAJ8.5CA-E3/61 | Vishay General Semiconductor - Diodes Division | 8.5V | 9.44V | 14.4V | 27.8A | 400W | -55 to 150°C | Active | ROHS3 Compliant |
| SMAJ8.5CA-TP | Micro Commercial Co | 8.5V | 9.44V | 14.4V | 27.7A | 400W | -55 to 175°C | Active | ROHS3 Compliant |
| SMAJ8.5CA-TR | STMicroelectronics | 8.5V | 9.4V | 19.5V | 124A (8/20µs) | 400W | -55 to 150°C | Active | ROHS3 Compliant |
| SMA6J8.5CA-TR | STMicroelectronics | 8.5V | 9.4V | 18.7V | 205A (8/20µs) | 600W | -55 to 175°C | Active | ROHS3 Compliant |
| SM4T10CAY | STMicroelectronics | 8.5V | 9.4V | 19.5V | 124A (8/20µs) | 400W | -55 to 150°C | Active | ROHS3 Compliant |
| SMAJP4KE10CA-TP | Micro Commercial Co | 8.55V | 9.5V | 14.5V | 28.3A | 400W | -55 to 175°C | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Group A - Direct Electrical Equivalents):
P4SMA10CA (Eaton) and SMAJP4KE10CA-TP (Micro Commercial Co) are the closest electrical equivalents, maintaining 8.55V reverse standoff voltage and 28.3A peak pulse current. Both parts are in active production status with current RoHS compliance. P4SMA10CA offers the widest inventory availability (17,900 pcs) and is recommended for applications requiring minimal design changes. SMAJP4KE10CA-TP provides an extended operating temperature range (-55 to 175°C) suitable for demanding thermal environments.
SMAJ8.5CA (MDD), SMAJ8.5CA-E3/61 (Vishay), and SMAJ8.5CA-TP (Micro Commercial Co) provide equivalent performance with marginally lower reverse standoff voltage (8.5V) and clamping voltage (14.4V). These parts are suitable for applications with less stringent voltage tolerance requirements. SMAJ8.5CA-E3/61 offers the highest inventory level (36,200 pcs) among Group A substitutes.
Secondary Substitutes (Group B - Enhanced Performance):
SMAJ8.5CA-TR (STMicroelectronics), SMA6J8.5CA-TR (STMicroelectronics), and SM4T10CAY (STMicroelectronics) provide higher clamping voltages (18.7V to 19.5V) and significantly increased peak pulse current (124A to 205A). These parts are suitable for applications requiring enhanced transient suppression capability. SMA6J8.5CA-TR offers the highest power dissipation (600W) and extended temperature range (-55 to 175°C), making it suitable for high-energy transient environments. SM4T10CAY includes AEC-Q101 automotive qualification, appropriate for automotive and industrial applications.
All substitute parts maintain DO-214AC (SMA) surface-mount packaging compatibility and RoHS3 compliance status.
Frequently Asked Questions (FAQ)
Q: Can I use SMAJ8.5CA-TR as a direct replacement for P4SMA10C?
A: SMAJ8.5CA-TR is electrically compatible but provides higher clamping voltage (19.5V vs. 15.23V) and significantly higher peak pulse current (124A vs. 28.3A). This part is suitable if your application can tolerate the higher clamping voltage and benefits from enhanced transient suppression. Verify circuit requirements before substitution.
Q: What is the difference between Group A and Group B substitutes?
A: Group A substitutes (P4SMA10CA, SMAJ8.5CA variants, SMAJP4KE10CA-TP) maintain clamping voltages between 14.4V and 14.5V, closely matching the original part's 15.23V specification. Group B substitutes (SMAJ8.5CA-TR, SMA6J8.5CA-TR, SM4T10CAY) provide higher clamping voltages (18.7V to 19.5V) and increased peak pulse current, offering enhanced overvoltage protection for demanding applications.
Q: Are all substitute parts RoHS compliant?
A: Yes, all listed substitute parts are RoHS3 compliant, meeting current environmental and regulatory requirements for electronic components.
Q: Does package compatibility affect substitution?
A: All substitute parts use DO-214AC (SMA) surface-mount packaging, identical to the original P4SMA10C. No PCB layout modifications are required for package compatibility.
Q: Which substitute offers the best inventory availability?
A: SMAJ8.5CA-E3/61 (Vishay) provides the highest inventory level at 36,200 pcs, followed by SMAJ8.5CA (MDD) at 72,400 pcs. Both parts are suitable for high-volume production requirements.
Q: Can I use SMAJP4KE10CA-TP in place of P4SMA10CA?
A: Yes, SMAJP4KE10CA-TP is electrically equivalent to P4SMA10CA with identical voltage and current specifications. The primary advantage is an extended operating temperature range (-55 to 175°C vs. -55 to 150°C), beneficial for high-temperature applications.
Q: What is the significance of the 8/20µs pulse specification for some parts?
A: Parts specified with 8/20µs pulse (SM4T10CAY, SMA6J8.5CA-TR, SMAJ8.5CA-TR) use a different test waveform than the standard 10/1000µs specification. These parts are designed for higher-energy transient events and provide enhanced protection in industrial and telecom applications.
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