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P4SMA300 Equivalent & Substitute Parts
Part Overview
The P4SMA300 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. The device features a 256V reverse standoff voltage with a 434.7V maximum clamping voltage and 400W peak pulse power rating in a DO-214AC (SMA) package.
The P4SMA300 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 |
|---|---|
| Manufacturer Part Number | P4SMA300 |
| Manufacturer | Littelfuse Inc. |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 256V |
| Voltage - Clamping (Max) @ Ipp | 434.7V |
| Current - Peak Pulse (10/1000µs) | 1A |
| Power - Peak Pulse | 400W |
| Package / Case | DO-214AC, SMA |
| Mounting Type | Surface Mount |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution of the P4SMA300 is determined by the following critical electrical and mechanical parameters:
- Unidirectional channel configuration (1 channel required)
- Reverse standoff voltage: 256V (Typ)
- Peak pulse current rating: 1A (10/1000µs)
- Peak pulse power rating: 400W
- Package type: DO-214AC (SMA) surface mount
- Zener diode type classification
The substitute parts P4SMA300A and SMAJP4KE300A-TP meet these core requirements. Both maintain the same reverse standoff voltage, peak pulse current, and power dissipation specifications. Clamping voltage variations (414V vs. 434.7V) remain within acceptable operational margins for general-purpose transient suppression applications.
Parameter Comparison
| Parameter | P4SMA300 (Main) | P4SMA300A (Eaton) | SMAJP4KE300A-TP (MCC) |
|---|---|---|---|
| Manufacturer | Littelfuse Inc. | Eaton - Electronics Division | Micro Commercial Co |
| Product Status | Obsolete | Active | Active |
| Type | Zener | Zener | Zener |
| Unidirectional Channels | 1 | 1 | 1 |
| Voltage - Reverse Standoff (Typ) | 256V | 256V | 256V |
| Voltage - Breakdown (Min) | 270.75V | 285V | 285V |
| Voltage - Clamping (Max) @ Ipp | 434.7V | 414V | 414V |
| Current - Peak Pulse (10/1000µs) | 1A | 1A | 1A |
| Power - Peak Pulse | 400W | 400W | 400W |
| Package / Case | DO-214AC, SMA | DO-214AC, SMA | DO-214AC, SMA |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount |
| Operating Temperature | -65°C ~ 150°C (TJ) | -55°C ~ 150°C (TJ) | -55°C ~ 175°C (TJ) |
| RoHS Status | ROHS3 Compliant | RoHS Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Both P4SMA300A (Eaton) and SMAJP4KE300A-TP (Micro Commercial Co) are active production alternatives to the obsolete P4SMA300.
P4SMA300A is the manufacturer-recommended direct equivalent, maintaining identical electrical specifications and operating temperature range (-55°C to 150°C). This part carries RoHS compliance certification and is available in high volume (9100 pcs in stock).
SMAJP4KE300A-TP offers an extended operating temperature range (-55°C to 175°C) and ROHS3 compliance. This part is suitable for applications requiring higher temperature performance. Inventory availability is lower (793 pcs in stock) compared to the Eaton alternative.
Both substitutes are electrically compatible with the original P4SMA300 for general-purpose transient voltage suppression. Selection between alternatives should be based on application temperature requirements, supply chain availability, and procurement lead times.
Frequently Asked Questions (FAQ)
Q: Can P4SMA300A and SMAJP4KE300A-TP be used interchangeably with P4SMA300?
A: Yes. Both substitute parts maintain the same reverse standoff voltage (256V), peak pulse current (1A), and power dissipation (400W) specifications. The clamping voltage difference (414V vs. 434.7V) does not prevent functional substitution in general-purpose applications.
Q: What is the difference in operating temperature ranges?
A: The P4SMA300 operates from -65°C to 150°C. The P4SMA300A operates from -55°C to 150°C. The SMAJP4KE300A-TP extends to -55°C to 175°C. Applications requiring operation below -55°C or above 150°C must evaluate compatibility with the original part specifications.
Q: Are all three parts in the same package?
A: Yes. All three parts use the DO-214AC (SMA) surface-mount package, ensuring mechanical and footprint compatibility on PCBs designed for the P4SMA300.
Q: What compliance certifications apply to the substitute parts?
A: P4SMA300A carries RoHS compliance. SMAJP4KE300A-TP carries ROHS3 compliance. Both parts have Moisture Sensitivity Level 1 (Unlimited), indicating no moisture sensitivity restrictions.
Q: Which substitute part should be selected for new designs?
A: For new designs, either active production part is acceptable. P4SMA300A is the manufacturer-recommended equivalent with established supply. SMAJP4KE300A-TP is suitable if extended temperature performance (-55°C to 175°C) is required.
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