Request Quote
(Ships tomorrow)
P6SMB22 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The P6SMB22 is a unidirectional Zener transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features an 18.8V reverse standoff voltage with a 32.13V maximum clamping voltage at peak pulse current, housed in a DO-214AA (SMB) package. The part is currently classified as obsolete, necessitating identification of active equivalent and substitute components that maintain electrical and mechanical compatibility for new designs and production continuity.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 18.8 | V |
| Voltage - Breakdown (Min) | 19.8 | V |
| Voltage - Clamping (Max) @ Ipp | 32.13 | V |
| Current - Peak Pulse (10/1000µs) | 19.9 | 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 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the P6SMB22 is determined by strict equivalence across the following electrical and mechanical parameters:
- Voltage - Reverse Standoff (Typ): 18.8V
- Voltage - Breakdown (Min): 20.9V (acceptable range for substitute parts)
- Voltage - Clamping (Max) @ Ipp: 30.6V (substitute parts show lower clamping voltage than original)
- Current - Peak Pulse: 19.6A to 20A (within acceptable tolerance)
- Power - Peak Pulse: 600W (maintained across all substitutes)
- Package / Case: DO-214AA, SMB (identical form factor)
- Mounting Type: Surface Mount (identical)
- Type: Zener, Unidirectional (identical)
- Operating Temperature Range: -55°C to 150°C minimum (some substitutes extend to -65°C or 175°C)
- RoHS Status: ROHS3 Compliant (maintained)
- Moisture Sensitivity Level: 1 (Unlimited) (maintained)
All identified substitute parts maintain the core 18.8V standoff voltage specification and 600W peak pulse power rating, with clamping voltages within the 30.6V range. Peak pulse current specifications remain within 19.6A to 20A across active alternatives.
Parameter Comparison
| Part Number | Manufacturer | Status | Vwm (V) | Vc (V) | Ipp (A) | Temp Range (°C) | Package | RoHS |
|---|---|---|---|---|---|---|---|---|
| P6SMB22 | Littelfuse Inc. | Obsolete | 18.8 | 32.13 | 19.9 | -55 to 150 | DO-214AA (SMB) | ROHS3 |
| P6SMB22A | Eaton - Electronics Division | Active | 18.8 | 30.6 | 19.7 | -55 to 150 | DO-214AA (SMB) | RoHS |
| SZP6SMB22AT3G | Littelfuse Inc. | Active | 18.8 | 30.6 | 20 | -65 to 150 | DO-214AA (SMB) | ROHS3 |
| P6SMB22A-M3/52 | Vishay General Semiconductor - Diodes Division | Active | 18.8 | 30.6 | 19.6 | -65 to 150 | DO-214AA (SMB) | ROHS3 |
| P6SMB22A-M3/5B | Vishay General Semiconductor - Diodes Division | Active | 18.8 | 30.6 | 19.6 | -65 to 150 | DO-214AA (SMB) | ROHS3 |
| SM6T22A | STMicroelectronics | Active | 18.8 | 30.6 | 102 (8/20µs) | -55 to 150 | DO-214AA (SMB) | ROHS3 |
| SM6T22A-E3/52 | Vishay General Semiconductor - Diodes Division | Active | 18.8 | 30.6 | 20 | -65 to 150 | DO-214AA (SMB) | ROHS3 |
| SM6T22A-E3/5B | Vishay General Semiconductor - Diodes Division | Active | 18.8 | 30.6 | 20 | -65 to 150 | DO-214AA (SMB) | ROHS3 |
| SM6T22AY | STMicroelectronics | Active | 18.8 | 30.6 | 102 (8/20µs) | -55 to 150 | DO-214AA (SMB) | ROHS3 |
| SMBJP6KE22A-TP | Micro Commercial Co | Active | 18.8 | 30.6 | 19.9 | -55 to 175 | DO-214AA (SMB) | ROHS3 |
Engineering Selection Recommendations
All identified substitute parts are classified as active products with current manufacturing status, eliminating obsolescence risk associated with the original P6SMB22. Selection among substitutes should be based on the following criteria:
Primary Recommendation: SZP6SMB22AT3G (Littelfuse Inc.) maintains manufacturer continuity with the original part, offers extended temperature range (-65°C to 150°C), and carries AEC-Q101 automotive qualification with ROHS3 compliance. This part is available in Tape & Reel packaging with 4129 units in stock.
Alternative Selections:
P6SMB22A-M3/52 and P6SMB22A-M3/5B (Vishay General Semiconductor - Diodes Division) provide direct electrical equivalence with extended temperature range (-65°C to 150°C) and ROHS3 compliance. Both are available in Tape & Box packaging with 927 and 1039 units respectively.
SM6T22A-E3/52 and SM6T22A-E3/5B (Vishay General Semiconductor - Diodes Division) offer identical electrical parameters with extended temperature range and ROHS3 compliance. SM6T22A-E3/52 has significantly higher inventory (30100 units).
SMBJP6KE22A-TP (Micro Commercial Co) extends the upper operating temperature to 175°C while maintaining all electrical specifications and ROHS3 compliance, with 4100 units available.
P6SMB22A (Eaton - Electronics Division) provides active status with standard temperature range (-55°C to 150°C) and RoHS compliance, with 3270 units in stock.
Frequently Asked Questions (FAQ)
Q: Can the P6SMB22 be directly replaced with any of these substitute parts?
A: Yes. All substitute parts maintain the critical 18.8V reverse standoff voltage, 600W peak pulse power rating, and DO-214AA (SMB) surface-mount package. Electrical parameters are within acceptable tolerance ranges for transient voltage suppression applications.
Q: What is the difference between the clamping voltage of the original P6SMB22 (32.13V) and the substitutes (30.6V)?
A: The original P6SMB22 specifies a maximum clamping voltage of 32.13V at peak pulse current. All active substitutes specify 30.6V clamping voltage. This represents a lower clamping threshold, which provides improved overvoltage protection margins. Applications requiring the original 32.13V specification should be re-evaluated for compatibility with the 30.6V clamping level.
Q: Are there temperature range differences between substitutes?
A: Yes. The original P6SMB22 operates from -55°C to 150°C. Several substitutes extend the lower temperature limit to -65°C (SZP6SMB22AT3G, P6SMB22A-M3/52, P6SMB22A-M3/5B, SM6T22A-E3/52, SM6T22A-E3/5B). SMBJP6KE22A-TP extends the upper limit to 175°C. Standard temperature range substitutes (P6SMB22A, SM6T22A, SM6T22AY) maintain -55°C to 150°C operation.
Q: What is the difference between parts with different peak pulse current specifications?
A: Most substitutes specify 19.6A to 20A peak pulse current (10/1000µs waveform), closely matching the original 19.9A. STMicroelectronics parts (SM6T22A, SM6T22AY) specify 102A peak pulse current using an 8/20µs waveform, representing a different measurement standard. Both specifications maintain the 600W peak pulse power rating and are electrically equivalent for the 18.8V standoff voltage class.
Q: Which substitute offers the best inventory availability?
A: SM6T22A-E3/52 (Vishay General Semiconductor - Diodes Division) has the highest inventory with 30100 units in stock, followed by SM6T22A (STMicroelectronics) with 17900 units.
Q: Are all substitutes RoHS compliant?
A: Yes. All substitute parts carry either RoHS or ROHS3 compliance status. The original P6SMB22 is ROHS3 compliant. All active substitutes maintain this compliance level.
Q: Which substitute is recommended for automotive applications?
A: SZP6SMB22AT3G (Littelfuse Inc.) carries AEC-Q101 automotive qualification and is specifically designated for automotive-grade applications. SM6T22AY (STMicroelectronics) also carries AEC-Q101 qualification.
Q: What packaging options are available?
A: Substitutes are available in multiple packaging formats: Cut Tape (CT) & Digi-Reel® (P6SMB22A, SM6T22A, SM6T22AY), Tape & Reel (TR) (SZP6SMB22AT3G, SM6T22A-E3/52, SM6T22A-E3/5B, SMBJP6KE22A-TP), and Tape & Box (TB) (P6SMB22A-M3/52, P6SMB22A-M3/5B). Select packaging based on production volume and assembly requirements.
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