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P6SMB15AT3 Equivalent & Substitute Parts
Part Overview
The P6SMB15AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for surface mount applications in the SMB (DO-214AA) package. This unidirectional zener diode provides 12.8V reverse standoff voltage with 21.2V maximum clamping voltage and 28A peak pulse current capability. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | P6SMB15AT3 |
| Manufacturer | onsemi |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 12.8V |
| Voltage - Breakdown (Min) | 14.3V |
| Voltage - Clamping (Max) @ Ipp | 21.2V |
| Current - Peak Pulse (10/1000µs) | 28A |
| Power - Peak Pulse | 600W |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| Package / Case | DO-214AA, SMB |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Grade | Automotive |
| Qualification | AEC-Q101 |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution of the P6SMB15AT3 is determined by the following critical electrical and mechanical parameters:
Electrical Compatibility Criteria:
- Voltage - Reverse Standoff (Typ): 12.8V ± tolerance
- Voltage - Breakdown (Min): 14.3V minimum
- Voltage - Clamping (Max) @ Ipp: 21.2V maximum
- Current - Peak Pulse (10/1000µs): minimum 28A
- Power - Peak Pulse: minimum 600W
Mechanical Compatibility Criteria:
- Package / Case: DO-214AA or SMB equivalent
- Mounting Type: Surface Mount
- Unidirectional Channels: 1
Substitute parts are grouped into two categories based on these parameters:
Category A - Direct Electrical & Mechanical Equivalents: Parts meeting all electrical parameters (12.8V standoff, 14.3V breakdown, 21.2V clamp, ≥28A peak pulse, 600W power) in DO-214AA/SMB package with active product status and modern compliance certifications.
Category B - Functional Equivalents with Parameter Variations: Parts meeting core voltage specifications (12.8V standoff, 14.3V breakdown) in DO-214AA/SMB package but with variations in peak pulse current, clamping voltage, or package designation that maintain functional compatibility within the 15V protection class.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (Typ) | Voltage - Breakdown (Min) | Voltage - Clamping (Max) @ Ipp | Current - Peak Pulse (10/1000µs) | Power - Peak Pulse | Package / Case | Operating Temperature | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| P6SMB15AT3 | onsemi | 12.8V | 14.3V | 21.2V | 28A | 600W | DO-214AA, SMB | -65°C ~ 150°C | Obsolete | RoHS non-compliant |
| 1KSMB15A | Taiwan Semiconductor Corporation | 12.8V | 14.3V | 21.2V | 47.2A | 1000W | DO-214AA, SMB | -55°C ~ 175°C | Active | ROHS3 Compliant |
| P6SMB15A | Eaton - Electronics Division | 12.8V | 14.3V | 21.2V | 28.8A | 600W | DO-214AA, SMB | -55°C ~ 150°C | Active | RoHS Compliant |
| P6SMB15A-M3/52 | Vishay General Semiconductor - Diodes Division | 12.8V | 14.3V | 21.2V | 28.3A | 600W | DO-214AA, SMB | -65°C ~ 150°C | Active | ROHS3 Compliant |
| P6SMB15A-M3/5B | Vishay General Semiconductor - Diodes Division | 12.8V | 14.3V | 21.2V | 28.3A | 600W | DO-214AA, SMB | -65°C ~ 150°C | Active | ROHS3 Compliant |
| PTVS13VP1UP,115 | Nexperia USA Inc. | 13V | 14.4V | 21.5V | 27.9A | 600W | SOD-128 | -55°C ~ 150°C | Active | ROHS3 Compliant |
| SM6T15A | STMicroelectronics | 12.8V | 14.3V | 27.2V | 147A (8/20µs) | 600W | DO-214AA, SMB | -55°C ~ 150°C | Active | ROHS3 Compliant |
| SM6T15A-M3/52 | Vishay General Semiconductor - Diodes Division | 12.8V | 14.3V | 21.2V | 28A | 600W | DO-214AA, SMB | -65°C ~ 150°C | Active | ROHS3 Compliant |
| SM6T15A-M3/5B | Vishay General Semiconductor - Diodes Division | 12.8V | 14.3V | 21.2V | 28A | 600W | DO-214AA, SMB | -65°C ~ 150°C | Active | ROHS3 Compliant |
| SM6T15AY | STMicroelectronics | 12.8V | 14.3V | 27.2V | 147A (8/20µs) | 600W | DO-214AA, SMB | -55°C ~ 150°C | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Primary Substitutes (Category A - Direct Equivalents):
P6SMB15A-M3/52 and P6SMB15A-M3/5B (Vishay) are the most direct substitutes, offering identical electrical specifications (12.8V standoff, 14.3V breakdown, 21.2V clamp, 28A peak pulse, 600W power) in the same DO-214AA/SMB package. Both parts are active products with ROHS3 compliance and AEC-Q101 automotive qualification equivalent to the original part's automotive grade. Operating temperature range extends to -65°C, matching the original specification.
SM6T15A-M3/52 and SM6T15A-M3/5B (Vishay) provide identical electrical and thermal specifications with active product status and ROHS3 compliance. These parts are functionally equivalent with the same 28A peak pulse current and 600W power rating.
P6SMB15A (Eaton) meets all electrical requirements with 28.8A peak pulse current and maintains 600W power rating. This part is active and RoHS compliant, though operating temperature is limited to -55°C minimum.
Secondary Substitutes (Category B - Functional Equivalents):
1KSMB15A (Taiwan Semiconductor Corporation) maintains core voltage specifications (12.8V standoff, 14.3V breakdown, 21.2V clamp) with enhanced performance: 47.2A peak pulse current and 1000W power rating. This part is active and ROHS3 compliant with extended operating temperature range (-55°C to 175°C). The higher current and power ratings provide additional margin for transient protection.
SM6T15A and SM6T15AY (STMicroelectronics) maintain the 12.8V standoff and 14.3V breakdown voltages but feature higher clamping voltage (27.2V) and significantly higher peak pulse current (147A at 8/20µs pulse). These parts are active, ROHS3 compliant, and automotive qualified (SM6T15AY). The higher clamping voltage represents a functional variation that may require circuit evaluation.
Package Consideration:
PTVS13VP1UP,115 (Nexperia) operates in SOD-128 package rather than DO-214AA/SMB, requiring PCB layout modification. Voltage specifications are similar (13V standoff, 14.4V breakdown, 21.5V clamp) with 27.9A peak pulse current. This part is active, ROHS3 compliant, and automotive qualified. Package change necessitates design review.
Compliance Status:
The original P6SMB15AT3 is RoHS non-compliant and obsolete. All listed substitutes are active products with modern compliance certifications (ROHS3 or RoHS Compliant), supporting transition to current manufacturing standards.
Frequently Asked Questions (FAQ)
Q: Can I directly replace P6SMB15AT3 with any of these substitute parts?
A: Direct replacement is possible with P6SMB15A-M3/52, P6SMB15A-M3/5B, SM6T15A-M3/52, and SM6T15A-M3/5B. These parts maintain identical electrical specifications (12.8V standoff, 14.3V breakdown, 21.2V clamp, 28A peak pulse) and the same DO-214AA/SMB package footprint. No circuit modification is required.
Q: What is the difference between parts with higher peak pulse current ratings?
A: Parts like 1KSMB15A (47.2A) and SM6T15A/SM6T15AY (147A) provide greater transient current handling capacity while maintaining the same voltage protection levels. These higher ratings offer additional safety margin but do not change the fundamental protection voltage. Selection depends on the actual transient current magnitude in your application.
Q: Why do some substitutes have different clamping voltages?
A: SM6T15A and SM6T15AY feature 27.2V clamping voltage compared to the original 21.2V. This represents a functional variation within the 15V protection class. Higher clamping voltage may affect circuit behavior during transient events and requires evaluation against your specific circuit requirements.
Q: Are all substitutes automotive qualified?
A: The original P6SMB15AT3 carries automotive grade and AEC-Q101 qualification. Among substitutes, P6SMB15A-M3/52, P6SMB15A-M3/5B, SM6T15AY, and PTVS13VP1UP,115 maintain AEC-Q101 automotive qualification. Other parts are active products suitable for general purpose applications.
Q: What is the impact of package change with PTVS13VP1UP,115?
A: PTVS13VP1UP,115 uses SOD-128 package instead of DO-214AA/SMB. This requires PCB layout modification and cannot be used as a direct footprint replacement. Electrical specifications are similar (13V standoff, 14.4V breakdown, 21.5V clamp), but design review is necessary before implementation.
Q: How do RoHS compliance differences affect part selection?
A: The original P6SMB15AT3 is RoHS non-compliant. All listed substitutes are RoHS compliant (either ROHS3 or RoHS Compliant), supporting transition to current manufacturing and environmental standards. RoHS compliance is mandatory for most new designs and procurement requirements.
Q: Can I use 1KSMB15A as a drop-in replacement?
A: Yes, 1KSMB15A is a direct footprint replacement in DO-214AA/SMB package with identical voltage specifications. The higher peak pulse current (47.2A vs. 28A) and power rating (1000W vs. 600W) provide enhanced protection margin. Extended operating temperature range (-55°C to 175°C) offers broader thermal capability.
Q: What should I consider when selecting between multiple equivalent parts?
A: Selection criteria include: (1) product status and availability, (2) compliance certifications (RoHS, AEC-Q101 for automotive), (3) operating temperature range requirements, (4) packaging constraints, (5) peak pulse current and power rating margin for your application, and (6) clamping voltage compatibility with circuit design.
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