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1SMB26AT3 Equivalent & Substitute Parts
Part Overview
The 1SMB26AT3 is a transient voltage suppressor (TVS) diode manufactured by onsemi, designed for general-purpose overvoltage protection in surface-mount applications. This unidirectional Zener diode features a 26V reverse standoff voltage with a 42.1V maximum clamping voltage and 14.2A peak pulse current capability in a DO-214AA (SMB) package. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | 1SMB26AT3 |
| Manufacturer | onsemi |
| Category | Transient Voltage Suppressors (TVS) |
| Type | Zener |
| Unidirectional Channels | 1 |
| Voltage - Reverse Standoff (Typ) | 26V |
| Voltage - Breakdown (Min) | 28.9V |
| Voltage - Clamping (Max) @ Ipp | 42.1V |
| Current - Peak Pulse (10/1000µs) | 14.2A |
| Power - Peak Pulse | 600W |
| Package / Case | DO-214AA, SMB |
| Mounting Type | Surface Mount |
| Operating Temperature | -65°C ~ 150°C (TJ) |
| Product Status | Obsolete |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the 1SMB26AT3 is determined by the following critical parameters:
- Voltage - Reverse Standoff (Typ): 26V
- Voltage - Breakdown (Min): 28.9V
- Voltage - Clamping (Max) @ Ipp: 42.1V
- Current - Peak Pulse (10/1000µs): 14.2A minimum
- Power - Peak Pulse: 600W
- Unidirectional Channels: 1
- Mounting Type: Surface Mount
- Package compatibility: DO-214AA (SMB) or equivalent footprint
Substitute parts are classified into two categories:
Direct Substitutes (Package: DO-214AA/SMB): Parts maintaining identical or superior electrical performance within the SMB package form factor, enabling direct PCB replacement without layout modification.
Similar Substitutes (Alternative Packages): Parts meeting all electrical specifications but utilizing alternative surface-mount packages (SMA, SOD-128) that require PCB layout adjustment but maintain functional equivalence.
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 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1SMB26AT3 | onsemi | 26V | 28.9V | 42.1V | 14.2A | 600W | DO-214AA, SMB | -65°C ~ 150°C (TJ) | Obsolete | RoHS non-compliant |
| SMBJ26A | EVVO Semi | 26V | 28.9V | 42.1V | 14.3A | 600W | DO-214AC, SMA | -65°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMBJ26A-TR | STMicroelectronics | 26V | 28.9V | 42.1V | 14.9A | 600W | DO-214AA, SMB | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| PTVS26VP1UP,115 | Nexperia USA Inc. | 26V | 28.9V | 42.1V | 14.3A | 600W | SOD-128 | -55°C ~ 150°C (TA) | Active | ROHS3 Compliant |
| SMBJ26A-13-F | Diodes Incorporated | 26V | 28.9V | 42.1V | 14.2A | 600W | DO-214AA, SMB | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMBJ26A-HR | Littelfuse Inc. | 26V | 28.9V | 42.1V | 14.3A | 600W | DO-214AA, SMB | -65°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMBJ26A-HRA | Littelfuse Inc. | 26V | 28.9V | 42.1V | 14.3A | 600W | DO-214AA, SMB | -65°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMBJ26A-M3/52 | Vishay General Semiconductor - Diodes Division | 26V | 28.9V | 42.1V | 14.3A | 600W | DO-214AA, SMB | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
| SMBJ26A-M3/5B | Vishay General Semiconductor - Diodes Division | 26V | 28.9V | 42.1V | 14.3A | 600W | DO-214AA, SMB | -55°C ~ 150°C (TJ) | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct SMB Package Substitutes (Preferred for PCB Compatibility):
SMBJ26A-13-F (Diodes Incorporated) and SMBJ26A-HR (Littelfuse Inc.) are the primary direct substitutes, maintaining identical DO-214AA (SMB) package geometry and matching the original 14.2A peak pulse current specification. Both are active products with ROHS3 compliance. SMBJ26A-13-F operates across -55°C to 150°C, while SMBJ26A-HR extends to -65°C, matching the original temperature range.
SMBJ26A-TR (STMicroelectronics) provides enhanced performance with 14.9A peak pulse current in the same SMB package, suitable for applications requiring additional margin. Operating temperature range is -55°C to 150°C.
SMBJ26A-M3/52 and SMBJ26A-M3/5B (Vishay General Semiconductor - Diodes Division) are TransZorb® series alternatives in DO-214AA (SMB) packages with 14.3A peak pulse current and ROHS3 compliance. Both operate at -55°C to 150°C.
SMBJ26A-HRA (Littelfuse Inc.) extends the temperature range to -65°C, matching the original specification, with 14.3A peak pulse current in SMB package.
Alternative Package Substitute:
PTVS26VP1UP,115 (Nexperia USA Inc.) meets all electrical specifications in a SOD-128 package with AEC-Q101 automotive qualification. This option requires PCB layout modification but provides automotive-grade reliability. Operating temperature is -55°C to 150°C.
SMBJ26A (EVVO Semi) in DO-214AC (SMA) package provides electrical equivalence with 14.3A peak pulse current and ROHS3 compliance but requires layout adjustment due to different package footprint.
Compliance Consideration:
The original 1SMB26AT3 is RoHS non-compliant. All active substitutes listed are ROHS3 compliant, meeting current regulatory requirements for new designs and procurement.
Frequently Asked Questions (FAQ)
Q: Can SMBJ26A-TR replace 1SMB26AT3 directly on the PCB?
A: Yes. SMBJ26A-TR maintains the DO-214AA (SMB) package footprint, enabling direct PCB replacement. The 14.9A peak pulse current exceeds the original 14.2A specification, providing additional performance margin.
Q: What is the difference between SMB and SMA packages?
A: SMB (DO-214AA) and SMA (DO-214AC) are both surface-mount diode packages but have different physical dimensions and PCB pad layouts. Direct substitution between these packages requires PCB redesign. The 1SMB26AT3 uses SMB; direct replacements maintain this package type.
Q: Is PTVS26VP1UP,115 suitable for non-automotive applications?
A: Yes. Although PTVS26VP1UP,115 carries AEC-Q101 automotive qualification, it meets all electrical specifications for general-purpose TVS applications. The SOD-128 package requires PCB layout modification compared to the original SMB package.
Q: Why are all active substitutes ROHS3 compliant when the original is not?
A: The 1SMB26AT3 is obsolete. Current manufacturing standards require ROHS3 compliance for new component production. All active substitutes meet modern regulatory requirements.
Q: Which substitute offers the closest electrical match to 1SMB26AT3?
A: SMBJ26A-13-F (Diodes Incorporated) provides the closest match, maintaining identical 14.2A peak pulse current, DO-214AA (SMB) package, and 600W peak pulse power in an active product with ROHS3 compliance.
Q: Can I use SMBJ26A (EVVO Semi) as a direct replacement?
A: SMBJ26A meets all electrical specifications but uses a DO-214AC (SMA) package instead of DO-214AA (SMB). PCB layout modification is required. If SMB package compatibility is essential, select SMBJ26A-13-F or SMBJ26A-HR instead.
Q: What is the temperature range difference between substitutes?
A: The original 1SMB26AT3 operates -65°C to 150°C. Most active substitutes operate -55°C to 150°C. SMBJ26A-HR and SMBJ26A-HRA extend to -65°C, matching the original range. Verify application temperature requirements before selection.
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