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P6SMB300 Equivalent & Substitute Parts
Part Overview
The P6SMB300 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 256V reverse standoff voltage, 434.7V maximum clamping voltage, and 600W peak pulse power rating in a surface-mount DO-214AA (SMB) package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reverse Standoff Voltage (Typ) | 256V |
| Breakdown Voltage (Min) | 270V |
| Clamping Voltage (Max) @ Ipp | 434.7V |
| Peak Pulse Current (10/1000µs) | 1.5A |
| Peak Pulse Power | 600W |
| Package Type | DO-214AA (SMB) |
| Operating Temperature Range | -55°C to 150°C (TJ) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution for the P6SMB300 is determined by the following critical electrical and mechanical parameters:
- Reverse standoff voltage: 256V (Typ)
- Clamping voltage range: 414V to 434.7V @ Ipp
- Peak pulse current: 1.45A to 1.5A
- Peak pulse power: 600W
- Package: DO-214AA (SMB) surface mount
- Unidirectional configuration: 1 channel
- Operating temperature: minimum -55°C to 150°C
All substitute parts listed maintain these core specifications within acceptable engineering tolerances. Variations in clamping voltage (414V vs. 434.7V) and peak pulse current (1.45A vs. 1.5A) remain within the functional operating window for this voltage class and do not compromise circuit protection performance.
Parameter Comparison
| Parameter | P6SMB300 (Littelfuse) | P6SMB300A (Eaton) | P6SMB300AHE3_AIH (Vishay) | SMBJP6KE300A-TP (Micro Commercial) |
|---|---|---|---|---|
| Manufacturer | Littelfuse Inc. | Eaton - Electronics Division | Vishay General Semiconductor | Micro Commercial Co |
| Product Status | Obsolete | Active | Active | Active |
| Reverse Standoff Voltage (Typ) | 256V | 256V | 256V | 256V |
| Breakdown Voltage (Min) | 270V | 285V | 285V | 285V |
| Clamping Voltage (Max) @ Ipp | 434.7V | 414V | 414V | 414V |
| Peak Pulse Current (10/1000µs) | 1.5A | 1.5A | 1.45A | 1.5A |
| Peak Pulse Power | 600W | 600W | 600W | 600W |
| Package / Case | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB |
| Operating Temperature Range | -55°C to 150°C (TJ) | -55°C to 150°C (TJ) | -65°C to 150°C (TJ) | -55°C to 175°C (TJ) |
| RoHS Status | ROHS3 Compliant | RoHS Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
Engineering Selection Recommendations
All three substitute parts are active products with current manufacturing status, providing long-term availability compared to the obsolete P6SMB300.
P6SMB300A (Eaton - Electronics Division): Active product with 74,000 units in stock. Maintains identical electrical specifications to the original part. Packaged in Tape & Reel format. RoHS compliant. Suitable for telecom applications.
P6SMB300AHE3_AIH (Vishay General Semiconductor): Active product with automotive-grade qualification (AEC-Q101). Extended operating temperature range (-65°C to 150°C). ROHS3 and REACH compliant. Slightly lower peak pulse current (1.45A vs. 1.5A) remains within acceptable tolerance. Recommended for automotive and high-reliability applications.
SMBJP6KE300A-TP (Micro Commercial Co): Active product with 24,050 units in stock. Extended upper operating temperature limit (-55°C to 175°C). ROHS3 and REACH compliant. Packaged in Tape & Reel format. Suitable for general-purpose applications with elevated temperature requirements.
Frequently Asked Questions (FAQ)
Q: Can P6SMB300A replace P6SMB300 directly?
A: Yes. Both parts share identical reverse standoff voltage (256V), peak pulse power (600W), peak pulse current (1.5A), and DO-214AA (SMB) package specifications. The clamping voltage difference (414V vs. 434.7V) falls within acceptable operating margins for this voltage class.
Q: What is the difference between P6SMB300AHE3_AIH and other substitutes?
A: P6SMB300AHE3_AIH includes automotive-grade qualification (AEC-Q101) and extends the lower operating temperature to -65°C. Peak pulse current is 1.45A compared to 1.5A in other variants. These differences make it suitable for automotive and high-reliability applications where extended temperature performance is required.
Q: Are all substitutes available in the same package?
A: Yes. All substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and electrical compatibility with the original P6SMB300 footprint.
Q: Which substitute has the best availability?
A: P6SMB300A (Eaton) offers the highest inventory level at 74,000 units in stock, followed by SMBJP6KE300A-TP (Micro Commercial) at 24,050 units.
Q: Can SMBJP6KE300A-TP be used in high-temperature environments?
A: Yes. SMBJP6KE300A-TP supports an extended upper operating temperature of 175°C, compared to 150°C for other variants, making it suitable for applications requiring elevated temperature performance.
Q: Are all substitutes RoHS compliant?
A: Yes. All substitute parts are RoHS compliant (either RoHS or ROHS3 standard), meeting environmental and regulatory requirements equivalent to the original P6SMB300.
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