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P6SMB43C Equivalent & Substitute Parts
Part Overview
The P6SMB43C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This bidirectional zener diode operates with a reverse standoff voltage of 36.8V and provides clamping at 62.27V with a peak pulse current of 10.3A. The part is currently obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within the specified electrical and mechanical parameters.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Reverse Standoff Voltage (Typ) | 36.8V |
| Voltage Breakdown (Min) | 38.75V |
| Voltage Clamping (Max) @ Ipp | 62.27V |
| Peak Pulse Current (10/1000µs) | 10.3A |
| Peak Pulse Power | 600W |
| Bidirectional Channels | 1 |
| Type | Zener |
| Package / Case | DO-214AA, SMB |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -55°C ~ 150°C (TJ) |
Substitute Part Grouping Explanation
Substitution of the P6SMB43C is determined by the following critical parameters:
Electrical Compatibility Requirements:
- Reverse standoff voltage: 36.8V (nominal)
- Voltage breakdown minimum: ≥38.75V
- Bidirectional channels: 1
- Type: Zener diode
Mechanical & Package Compatibility:
- Package / Case: DO-214AA, SMB
- Mounting type: Surface Mount
- Moisture sensitivity level: 1 (Unlimited)
Performance Parameters:
- Peak pulse current: ≥10.3A
- Peak pulse power: ≥600W
- Operating temperature range: Must encompass -55°C to 150°C minimum
Substitute parts are grouped into two categories based on electrical performance:
Category A - Direct Electrical Equivalents (≤62.27V clamping): Parts with clamping voltage at or below 62.27V maintain the original circuit protection threshold. These include P6SMB43CA variants from Eaton and Vishay, and P6SMB43CA TR13 PBFREE from Central Semiconductor.
Category B - Enhanced Performance Substitutes (>600W power rating): The 1KSMB43CA and 1KSMB43CAH from Taiwan Semiconductor Corporation provide 1000W peak pulse power with 16.9A peak pulse current, offering increased transient energy absorption capability while maintaining identical voltage parameters.
Parameter Comparison
| Part Number | Manufacturer | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current (A) | Peak Pulse Power (W) | Package | Status |
|---|---|---|---|---|---|---|---|---|
| P6SMB43C | Littelfuse Inc. | 36.8 | 38.75 | 62.27 | 10.3 | 600 | DO-214AA, SMB | Obsolete |
| P6SMB43CA | Eaton - Electronics Division | 36.8 | 40.9 | 59.3 | 10.3 | 600 | DO-214AA, SMB | Active |
| P6SMB43CA-E3/52 | Vishay General Semiconductor | 36.8 | 40.9 | 59.3 | 10.1 | 600 | DO-214AA, SMB | Active |
| P6SMB43CA-E3/5B | Vishay General Semiconductor | 36.8 | 40.9 | 59.3 | 10.1 | 600 | DO-214AA, SMB | Active |
| P6SMB43CA-M3/52 | Vishay General Semiconductor | 36.8 | 40.9 | 59.3 | 10.1 | 600 | DO-214AA, SMB | Active |
| P6SMB43CA-M3/5B | Vishay General Semiconductor | 36.8 | 40.9 | 59.3 | 10.1 | 600 | DO-214AA, SMB | Active |
| P6SMB43CA TR13 PBFREE | Central Semiconductor Corp | 36.8 | 40.9 | 59.3 | 10.1 | 600 | DO-214AA, SMB | Active |
| 1KSMB43CA | Taiwan Semiconductor Corporation | 36.8 | 40.9 | 59.3 | 16.9 | 1000 | DO-214AA, SMB | Active |
| 1KSMB43CAH | Taiwan Semiconductor Corporation | 36.8 | 40.9 | 59.3 | 16.9 | 1000 | DO-214AA, SMB | Active |
Engineering Selection Recommendations
Primary Substitutes (Direct Replacement): P6SMB43CA from Eaton and Vishay variants (P6SMB43CA-E3/52, P6SMB43CA-E3/5B, P6SMB43CA-M3/52, P6SMB43CA-M3/5B) are active products with identical electrical specifications and package compatibility. All are RoHS3 compliant with MSL 1 rating. Vishay parts offer extended operating temperature range (-65°C to 150°C) compared to the original specification.
Alternative Substitute (Central Semiconductor): P6SMB43CA TR13 PBFREE maintains full electrical and package compatibility with active product status and RoHS3 compliance. Operating temperature range is -65°C to 150°C.
Enhanced Performance Option: 1KSMB43CA and 1KSMB43CAH from Taiwan Semiconductor Corporation provide identical voltage parameters with increased transient energy handling (1000W vs. 600W) and higher peak pulse current (16.9A vs. 10.3A). The 1KSMB43CAH variant includes AEC-Q101 automotive qualification and extended operating temperature to 175°C. These are suitable for applications requiring enhanced overvoltage protection margin.
All recommended substitutes maintain DO-214AA (SMB) package compatibility, surface mount configuration, and MSL 1 moisture sensitivity rating.
Frequently Asked Questions (FAQ)
Q: Can P6SMB43CA variants be used as direct replacements for P6SMB43C?
A: Yes. P6SMB43CA from Eaton and Vishay variants maintain identical reverse standoff voltage (36.8V), breakdown voltage specifications, and package configuration (DO-214AA, SMB). All are active products with RoHS3 compliance. The lower clamping voltage (59.3V vs. 62.27V) provides tighter protection thresholds suitable for the same circuit applications.
Q: What is the difference between Vishay variants (E3/52, E3/5B, M3/52, M3/5B)?
A: The designations indicate packaging and reel configurations. E3 variants use Tape & Reel (TR) packaging, while M3 variants use Tape & Box (TB) packaging. The /52 and /5B suffixes denote different reel specifications. Electrical specifications and DO-214AA package remain identical across all variants.
Q: When should 1KSMB43CA be selected over standard P6SMB43CA?
A: The 1KSMB43CA is selected when circuit design requires higher transient energy absorption (1000W vs. 600W) or higher peak pulse current handling (16.9A vs. 10.3A). Voltage parameters remain identical, making it a compatible upgrade for applications with demanding transient conditions.
Q: Is 1KSMB43CAH suitable for automotive applications?
A: Yes. The 1KSMB43CAH carries AEC-Q101 automotive qualification and is rated for -55°C to 175°C operating temperature, meeting automotive-grade requirements. It maintains identical electrical specifications to the standard 1KSMB43CA.
Q: Are all substitute parts RoHS compliant?
A: Yes. All listed substitute parts are RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and reliability standards.
Q: Can substitute parts be mixed in the same production batch?
A: Yes. All substitute parts maintain identical DO-214AA (SMB) package configuration and surface mount compatibility. However, design documentation should specify the approved part number to ensure consistent procurement and traceability.
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