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P4SMA440C Equivalent & Substitute Parts
Part Overview
The P4SMA440C is a bidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. The device features a 376V reverse standoff voltage with 632.1V maximum clamping voltage and 400W peak pulse power rating in a DO-214AC (SMA) package.
The P4SMA440C is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and field replacements.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 376 | V |
| Voltage - Breakdown (Min) | 397.1 | V |
| Voltage - Clamping (Max) @ Ipp | 632.1 | V |
| Current - Peak Pulse (10/1000µs) | 700 | mA |
| Power - Peak Pulse | 400 | W |
| Bidirectional Channels | 1 | — |
| Package / Case | DO-214AC, SMA | — |
| Operating Temperature Range | -65 to 150 | °C (TJ) |
| Mounting Type | Surface Mount | — |
Substitute Part Grouping Explanation
Substitution of the P4SMA440C is determined by the following critical electrical and mechanical parameters:
- Voltage - Reverse Standoff (Typ): 376V
- Current - Peak Pulse (10/1000µs): 700mA
- Power - Peak Pulse: 400W
- Bidirectional Channels: 1
- Package / Case: DO-214AC, SMA
- Mounting Type: Surface Mount
Substitute parts must maintain identical reverse standoff voltage, peak pulse current, peak pulse power rating, and package configuration. Variations in clamping voltage and breakdown voltage within the specified operating range are acceptable provided the reverse standoff voltage remains constant.
Parameter Comparison
| Parameter | P4SMA440C (Littelfuse) | P4SMA440CA (Eaton) | SMAJP4KE440CA-TP (Micro Commercial Co) |
|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 376V | 376V | 376V |
| Voltage - Breakdown (Min) | 397.1V | 418V | 418V |
| Voltage - Clamping (Max) @ Ipp | 632.1V | 602V | 602V |
| Current - Peak Pulse (10/1000µs) | 700mA | 700mA | 700mA |
| Power - Peak Pulse | 400W | 400W | 400W |
| Bidirectional Channels | 1 | 1 | 1 |
| Package / Case | DO-214AC, SMA | DO-214AC, SMA | DO-214AC, SMAJ |
| Operating Temperature Range | -65 to 150°C | -55 to 150°C | -55 to 175°C |
| Product Status | Obsolete | Active | Active |
| RoHS Status | ROHS3 Compliant | RoHS Compliant | REACH Unaffected |
Engineering Selection Recommendations
P4SMA440CA (Eaton - Electronics Division) is the manufacturer-recommended substitute. This part maintains all critical electrical parameters identical to the P4SMA440C while offering active product status and improved availability (23,950 pcs in stock). The P4SMA440CA is RoHS compliant and suitable for telecom applications. The operating temperature range is reduced to -55 to 150°C compared to the original -65 to 150°C specification.
SMAJP4KE440CA-TP (Micro Commercial Co) is an alternative substitute with identical electrical specifications. This part offers an extended operating temperature range of -55 to 175°C and is available in bulk packaging (861 pcs in stock). The package designation is DO-214AC (SMAJ) rather than standard SMA, which may require PCB layout verification for mechanical compatibility.
Both substitute parts are active products with current manufacturing support and regulatory compliance documentation.
Frequently Asked Questions (FAQ)
Q: Can P4SMA440CA be used as a direct replacement for P4SMA440C?
A: Yes. The P4SMA440CA maintains identical reverse standoff voltage (376V), peak pulse current (700mA), and peak pulse power (400W). The clamping voltage is lower (602V vs 632.1V), which provides improved transient suppression performance. Operating temperature range is reduced from -65 to 150°C to -55 to 150°C.
Q: What is the difference between P4SMA440CA and SMAJP4KE440CA-TP?
A: Both parts share identical electrical specifications (376V standoff, 700mA peak pulse, 400W power). The primary differences are: SMAJP4KE440CA-TP offers extended temperature range (-55 to 175°C), uses SMAJ package designation instead of standard SMA, and is supplied in bulk rather than tape & reel packaging.
Q: Are there package compatibility concerns with SMAJP4KE440CA-TP?
A: The SMAJP4KE440CA-TP uses DO-214AC (SMAJ) package designation. While mechanically similar to standard SMA, the SMAJ variant may have dimensional differences. PCB footprint and land pattern verification is required before design implementation.
Q: Which substitute part should be selected for new designs?
A: P4SMA440CA is recommended for new designs due to active product status, established supply chain, and tape & reel packaging standard in manufacturing environments. SMAJP4KE440CA-TP is suitable if extended temperature range (-55 to 175°C) is required.
Q: Are both substitute parts RoHS compliant?
A: P4SMA440CA is RoHS compliant. SMAJP4KE440CA-TP has REACH Unaffected status. Both parts meet current environmental and regulatory requirements for electronic component manufacturing.
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