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P6SMB43 Equivalent & Substitute Parts
Part Overview
The P6SMB43 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse, designed for general-purpose overvoltage protection applications. This component features a 36.8V reverse standoff voltage with a 62.27V maximum clamping voltage and 10.3A peak pulse current capability in a surface-mount DO-214AA (SMB) package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Voltage - Reverse Standoff (Typ) | 36.8V |
| Voltage - Breakdown (Min) | 38.75V |
| Voltage - Clamping (Max) @ Ipp | 62.27V |
| Current - Peak Pulse (10/1000µs) | 10.3A |
| Power - Peak Pulse | 600W |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | DO-214AA, SMB |
| Type | Zener |
| Unidirectional Channels | 1 |
Substitute Part Grouping Explanation
Substitution for the P6SMB43 is determined by strict equivalence across the following critical parameters:
- Voltage - Reverse Standoff (Typ): 36.8V
- Voltage - Clamping (Max) @ Ipp: Must remain within acceptable circuit protection limits
- Current - Peak Pulse (10/1000µs): 10.3A
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA, SMB (surface-mount compatibility)
- Type: Zener, Unidirectional (1 channel)
- Operating Temperature Range: -55°C minimum to 150°C minimum
The identified substitute parts maintain these core electrical and mechanical specifications, ensuring functional equivalence in circuit protection applications.
Parameter Comparison
| Parameter | P6SMB43 (Littelfuse) | P6SMB43A (Eaton) | SMBJP6KE43A-TP (Micro Commercial Co) |
|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 36.8V | 36.8V | 36.8V |
| Voltage - Breakdown (Min) | 38.75V | 40.9V | 40.9V |
| Voltage - Clamping (Max) @ Ipp | 62.27V | 59.3V | 59.3V |
| Current - Peak Pulse (10/1000µs) | 10.3A | 10.3A | 10.3A |
| Power - Peak Pulse | 600W | 600W | 600W |
| Operating Temperature Range | -55°C ~ 150°C | -55°C ~ 150°C | -55°C ~ 175°C |
| Package / Case | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB |
| Product Status | Obsolete | Active | Active |
| RoHS Status | ROHS3 Compliant | RoHS Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Both P6SMB43A (Eaton - Electronics Division) and SMBJP6KE43A-TP (Micro Commercial Co) are active product alternatives to the obsolete P6SMB43. Selection between these substitutes is based on the following factors:
P6SMB43A is recommended for applications requiring telecom-grade reliability and active manufacturer support. This part maintains full RoHS compliance and is available in high inventory quantities (148,243 pcs).
SMBJP6KE43A-TP is suitable for general-purpose applications and offers an extended operating temperature range (-55°C ~ 175°C) compared to the original specification. This part is ROHS3 compliant and maintains active product status with lower inventory availability (1,079 pcs).
Both substitutes maintain the critical electrical parameters: 36.8V reverse standoff voltage, 10.3A peak pulse current, and 600W peak pulse power. The voltage clamping characteristics differ slightly (59.3V versus 62.27V), which must be evaluated against specific circuit protection requirements.
Frequently Asked Questions (FAQ)
Q: Can P6SMB43A directly replace P6SMB43 in existing designs?
A: Yes. Both parts share identical reverse standoff voltage (36.8V), peak pulse current (10.3A), power rating (600W), and package type (DO-214AA, SMB). The voltage clamping difference (59.3V versus 62.27V) must be verified against circuit protection thresholds.
Q: What is the difference between P6SMB43A and SMBJP6KE43A-TP?
A: Both parts maintain equivalent electrical specifications for the core protection function. SMBJP6KE43A-TP offers an extended operating temperature range (-55°C ~ 175°C versus -55°C ~ 150°C). P6SMB43A is positioned for telecom applications with higher inventory availability.
Q: Are all substitute parts RoHS compliant?
A: Yes. P6SMB43A is RoHS compliant, and SMBJP6KE43A-TP is ROHS3 compliant. Both meet environmental compliance requirements.
Q: Does the voltage clamping difference affect substitution?
A: The voltage clamping specification (59.3V for substitutes versus 62.27V for the original) represents the maximum transient voltage at peak pulse current. Circuit designs must confirm that the lower clamping voltage of substitute parts remains within acceptable protection limits for the protected circuit.
Q: Are the packages identical?
A: Yes. All parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and footprint compatibility.
Q: What is the moisture sensitivity level?
A: All parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.
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