Request Quote
(Ships tomorrow)
P6SMB27 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The P6SMB27 is a unidirectional transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This component features a 23.1V reverse standoff voltage with a 39.38V maximum clamping voltage and 16.3A peak pulse current capability in a surface-mount DO-214AA (SMB) package. The part is classified as 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 | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 23.1 | V |
| Voltage - Breakdown (Min) | 24.35 | V |
| Voltage - Clamping (Max) @ Ipp | 39.38 | V |
| Current - Peak Pulse (10/1000µs) | 16.3 | 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 P6SMB27 is determined by strict adherence to the following electrical and mechanical parameters:
Critical Matching Parameters:
- Voltage - Reverse Standoff (Typ): 23.1V
- Voltage - Breakdown (Min): 24.35V minimum
- Current - Peak Pulse (10/1000µs): 16.3A or greater
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA, SMB (surface mount)
- Type: Zener, Unidirectional (1 channel)
Acceptable Variation Ranges:
- Voltage - Clamping (Max) @ Ipp: 37.5V to 48.3V (within circuit design tolerance)
- Operating Temperature: -55°C to 150°C minimum (extended ranges acceptable)
Substitute parts are grouped into two categories based on clamping voltage performance: standard clamping (37.5V) and higher clamping (48.3V) variants. All listed substitutes maintain the core 23.1V standoff voltage and 600W peak pulse power rating while meeting or exceeding the 16.3A peak pulse current specification.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Breakdown Min (V) | Voltage - Clamping Max @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Product Status | Package |
|---|---|---|---|---|---|---|---|---|---|
| P6SMB27 | Littelfuse Inc. | 23.1 | 24.35 | 39.38 | 16.3 | 600 | -55 to 150 | Obsolete | DO-214AA, SMB |
| P6SMB27A | Eaton - Electronics Division | 23.1 | 25.7 | 37.5 | 16.3 | 600 | -55 to 150 | Active | DO-214AA, SMB |
| SZP6SMB27AT3G | onsemi | 23.1 | 25.7 | 37.5 | 16 | 600 | -65 to 150 | Active | DO-214AA, SMB |
| SM6T27A | STMicroelectronics | 23.1 | 25.7 | 48.3 | 83 (8/20µs) | 600 | -55 to 150 | Active | DO-214AA, SMB |
| SM6T27A-E3/52 | Vishay General Semiconductor - Diodes Division | 23.1 | 25.7 | 37.5 | 16 | 600 | -65 to 150 | Active | DO-214AA, SMB |
| SM6T27A-E3/5B | Vishay General Semiconductor - Diodes Division | 23.1 | 25.7 | 37.5 | 16 | 600 | -65 to 150 | Active | DO-214AA, SMB |
| SM6T27AY | STMicroelectronics | 23.1 | 25.7 | 48.3 | 83 (8/20µs) | 600 | -55 to 150 | Active | DO-214AA, SMB |
| SMBJP6KE27A-TP | Micro Commercial Co | 23.1 | 25.7 | 37.5 | 16.3 | 600 | -55 to 175 | Active | DO-214AA, SMB |
Engineering Selection Recommendations
Primary Recommendation - Standard Clamping Voltage (37.5V):
P6SMB27A (Eaton - Electronics Division) and SMBJP6KE27A-TP (Micro Commercial Co) are direct functional equivalents with active product status. Both maintain the 23.1V standoff voltage, 16.3A peak pulse current, and 600W power rating. P6SMB27A offers the advantage of higher inventory availability (20,140 pcs) and established telecom application history. SMBJP6KE27A-TP provides extended operating temperature range to 175°C.
SM6T27A-E3/52 and SM6T27A-E3/5B (Vishay General Semiconductor - Diodes Division) are functionally equivalent with extended operating temperature range (-65°C to 150°C) and RoHS3 compliance. Both are available in active status with adequate inventory.
SZP6SMB27AT3G (onsemi) is an active equivalent with automotive-grade qualification (AEC-Q101) and extended lower temperature rating (-65°C), suitable for automotive and harsh environment applications.
Alternative Selection - Higher Clamping Voltage (48.3V):
SM6T27A and SM6T27AY (STMicroelectronics) provide higher clamping voltage (48.3V) with significantly increased peak pulse current capability (83A at 8/20µs pulse). These components are suitable for applications requiring enhanced transient suppression performance. SM6T27AY includes automotive-grade qualification (AEC-Q101).
Compliance Considerations:
All substitute parts maintain RoHS3 compliance or equivalent. Moisture Sensitivity Level (MSL) is 1 (Unlimited) across all options. REACH status is unaffected for all active substitutes.
Frequently Asked Questions (FAQ)
Q: Can P6SMB27A directly replace P6SMB27?
A: Yes. P6SMB27A maintains the critical electrical parameters: 23.1V reverse standoff voltage, 16.3A peak pulse current, and 600W peak pulse power. The clamping voltage is 37.5V versus 39.38V in the original, which is within acceptable circuit design tolerance for most applications. Both use identical DO-214AA (SMB) surface-mount packaging.
Q: What is the difference between the 37.5V and 48.3V clamping voltage options?
A: The 37.5V clamping variants (P6SMB27A, SZP6SMB27AT3G, SM6T27A-E3/52, SM6T27A-E3/5B, SMBJP6KE27A-TP) provide clamping performance closer to the original P6SMB27 (39.38V). The 48.3V variants (SM6T27A, SM6T27AY) offer higher clamping voltage with increased peak pulse current (83A), suitable for applications requiring more aggressive transient suppression. Selection depends on circuit protection requirements.
Q: Are all substitutes available in the same package?
A: Yes. All listed substitute parts use the DO-214AA (SMB) surface-mount package, ensuring mechanical and electrical compatibility with existing PCB layouts and assembly processes.
Q: Which substitute offers the widest operating temperature range?
A: SM6T27A-E3/52, SM6T27A-E3/5B, and SZP6SMB27AT3G all provide -65°C to 150°C operating range, extending the lower temperature limit by 10°C compared to the original P6SMB27 (-55°C to 150°C). SMBJP6KE27A-TP extends the upper limit to 175°C.
Q: What is the inventory status for each substitute?
A: P6SMB27A (Eaton) has the highest availability at 20,140 pcs. SM6T27A (STMicroelectronics) offers 10,400 pcs. SM6T27A-E3/52 (Vishay) provides 8,530 pcs. SM6T27AY (STMicroelectronics) has 7,097 pcs. SZP6SMB27AT3G (onsemi) provides 2,100 pcs. SMBJP6KE27A-TP (Micro Commercial Co) has 1,080 pcs. SM6T27A-E3/5B (Vishay) has the lowest availability at 848 pcs.
Q: Are automotive-qualified options available?
A: Yes. SZP6SMB27AT3G (onsemi) and SM6T27AY (STMicroelectronics) both carry AEC-Q101 automotive qualification, suitable for automotive and mission-critical applications requiring enhanced reliability standards.
Alternative Parts
SJ6012L2TP
Littelfuse Inc.
6 Alternative Parts
JMK107BBJ476MA-RE
Taiyo Yuden
10 Alternative Parts
GMK107BBJ475MA-T
Taiyo Yuden
5 Alternative Parts
SJ6020N2ARP
Littelfuse Inc.
3 Alternative Parts
SJ6025R2ATP
Littelfuse Inc.
4 Alternative Parts
2474-05L
API Delevan Inc.
1 Alternative Parts
4590R-684K
API Delevan Inc.
1 Alternative Parts
CM6560R-334
API Delevan Inc.
1 Alternative Parts
CM6460-104
API Delevan Inc.
1 Alternative Parts
5526-12
API Delevan Inc.
1 Alternative Parts