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P6SMB36 Equivalent & Substitute Parts
Part Overview
The P6SMB36 is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This unidirectional Zener diode operates with a reverse standoff voltage of 30.8V and provides clamping at 52.4V with a peak pulse current rating of 12.2A. The part is currently classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within the same electrical and mechanical specifications.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 30.8 | V |
| Voltage - Breakdown (Min) | 32.4 | V |
| Voltage - Clamping (Max) @ Ipp | 52.4 | V |
| Current - Peak Pulse (10/1000µs) | 12.2 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AA, SMB | — |
| Mounting Type | Surface Mount | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
Substitute Part Grouping Explanation
Substitution of the P6SMB36 is determined by strict adherence to the following electrical and mechanical parameters:
Critical Matching Parameters:
- Reverse standoff voltage: 30.8V (Typ)
- Breakdown voltage minimum: 32.4V or higher
- Package type: DO-214AA / SMB (surface mount)
- Unidirectional configuration: 1 channel
- Diode type: Zener
- Peak pulse power rating: 600W
- Operating temperature range: minimum -55°C to 150°C
Acceptable Variation Ranges:
- Clamping voltage: 49.9V to 52.4V (within design tolerance)
- Peak pulse current: 12A to 12.2A (within design tolerance)
- RoHS compliance: ROHS3 or RoHS Compliant
- Moisture sensitivity: MSL 1 (Unlimited)
Substitute parts are grouped based on whether they meet all critical parameters while maintaining functional equivalence. Parts with identical electrical specifications but different manufacturers or packaging formats are classified as direct substitutes. Parts with minor variations in clamping voltage or peak current within acceptable ranges are classified as functional equivalents.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Reverse Standoff (V) | Breakdown Min (V) | Clamping Max @ Ipp (V) | Peak Pulse Current (A) | Power Peak Pulse (W) | Operating Temp (°C) | Package |
|---|---|---|---|---|---|---|---|---|---|
| P6SMB36 | Littelfuse Inc. | Obsolete | 30.8 | 32.4 | 52.4 | 12.2 | 600 | -55 to 150 | DO-214AA, SMB |
| P6SMB36A | Eaton - Electronics Division | Active | 30.8 | 34.2 | 49.9 | 12.2 | 600 | -55 to 150 | DO-214AA, SMB |
| SZP6SMB36AT3G | Littelfuse Inc. | Active | 30.8 | 34.2 | 49.9 | 12 | 600 | -65 to 150 | DO-214AA, SMB |
| P6SMB36A-M3/52 | Vishay General Semiconductor - Diodes Division | Active | 30.8 | 34.2 | 49.9 | 12 | 600 | -65 to 150 | DO-214AA, SMB |
| P6SMB36A-M3/5B | Vishay General Semiconductor - Diodes Division | Active | 30.8 | 34.2 | 49.9 | 12 | 600 | -65 to 150 | DO-214AA, SMB |
| SM6T36A-E3/5B | Vishay General Semiconductor - Diodes Division | Active | 30.8 | 34.2 | 49.9 | 12 | 600 | -65 to 150 | DO-214AA, SMB |
| SM6T36AY | STMicroelectronics | Active | 30.8 | 34.2 | 64.3 | 62 (8/20µs) | 600 | -55 to 150 | DO-214AA, SMB |
| SMBJP6KE36A-TP | Micro Commercial Co | Active | 30.8 | 34.2 | 49.9 | 12.2 | 600 | -55 to 175 | DO-214AA, SMB |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
P6SMB36A (Eaton) and SMBJP6KE36A-TP (Micro Commercial Co) are the closest functional equivalents to the obsolete P6SMB36. Both maintain identical reverse standoff voltage (30.8V), peak pulse current (12.2A), and power rating (600W). The clamping voltage differential (49.9V vs. 52.4V) falls within acceptable design tolerance for most general-purpose applications. Both parts are active products with RoHS compliance and unlimited moisture sensitivity rating.
Secondary Substitutes (Acceptable Equivalents):
SZP6SMB36AT3G (Littelfuse Inc.), P6SMB36A-M3/52, P6SMB36A-M3/5B, and SM6T36A-E3/5B all meet the critical electrical parameters with clamping voltage of 49.9V and peak pulse current of 12A. These parts extend the operating temperature range to -65°C, providing enhanced thermal performance. All are active products with ROHS3 compliance and unlimited moisture sensitivity.
Alternative with Enhanced Performance:
SM6T36AY (STMicroelectronics) maintains the 30.8V reverse standoff voltage but exhibits higher clamping voltage (64.3V) and significantly elevated peak pulse current (62A at 8/20µs pulse). This part is suitable only for applications where higher current handling and clamping voltage are acceptable. AEC-Q101 automotive qualification is available.
Selection Criteria:
- For direct replacement in existing designs: P6SMB36A or SMBJP6KE36A-TP
- For enhanced thermal performance: SZP6SMB36AT3G or Vishay variants
- For automotive applications: SM6T36AY with AEC-Q101 qualification
- All recommended substitutes maintain DO-214AA / SMB package compatibility and surface mount configuration
Frequently Asked Questions (FAQ)
Q: Can P6SMB36A directly replace the obsolete P6SMB36?
A: Yes. P6SMB36A maintains the same reverse standoff voltage (30.8V), peak pulse current (12.2A), and power rating (600W). The clamping voltage is 49.9V compared to 52.4V in the original part, which is within acceptable design tolerance for general-purpose transient voltage suppression.
Q: What is the difference between the clamping voltage specifications?
A: The P6SMB36 specifies maximum clamping at 52.4V, while most substitutes specify 49.9V. Both values represent the maximum voltage at peak pulse current and fall within the same voltage class. The 2.5V difference is acceptable for applications designed around the 30.8V reverse standoff specification.
Q: Are all substitute parts compatible with the same PCB footprint?
A: Yes. All listed substitutes use the DO-214AA / SMB package with identical surface mount footprint. No PCB layout modifications are required for mechanical compatibility.
Q: Which substitute offers the widest operating temperature range?
A: SZP6SMB36AT3G, P6SMB36A-M3/52, P6SMB36A-M3/5B, and SM6T36A-E3/5B all operate from -65°C to 150°C, compared to the original P6SMB36 range of -55°C to 150°C. This provides 10°C additional low-temperature margin.
Q: Is RoHS compliance maintained across all substitutes?
A: Yes. All active substitute parts are either ROHS3 Compliant or RoHS Compliant. The original P6SMB36 is ROHS3 Compliant, and all recommended substitutes maintain this or equivalent compliance status.
Q: What is the difference between SM6T36AY and other substitutes?
A: SM6T36AY exhibits higher clamping voltage (64.3V) and significantly higher peak pulse current (62A at 8/20µs pulse specification). This part is suitable only for applications where higher current handling capability is required. It includes AEC-Q101 automotive qualification.
Q: Can I use SMBJP6KE36A-TP in applications requiring extended temperature operation?
A: SMBJP6KE36A-TP operates to 175°C maximum junction temperature, exceeding the original P6SMB36 specification of 150°C. This provides additional thermal margin for high-temperature environments while maintaining all other electrical specifications.
Q: Are there inventory considerations for selecting a substitute?
A: Yes. P6SMB36A (Eaton) has 45,400 units in stock, SZP6SMB36AT3G (Littelfuse) has 93,300 units, and SM6T36AY (STMicroelectronics) has 15,838 units available. Availability should be verified with your supplier for production requirements.
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