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SMAJ26A-E3/5A Equivalent & Substitute Parts
Part Overview
The SMAJ26A-E3/5A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates in the DO-214AC (SMA) package and is designed for general-purpose transient voltage protection applications. The part is currently active in production with 112,600 units in stock. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters to ensure functional interchangeability in circuit designs.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 26 | V |
| Voltage - Breakdown (Min) | 28.9 | V |
| Voltage - Clamping (Max) @ Ipp | 42.1 | V |
| Current - Peak Pulse (10/1000µs) | 9.5 | A |
| Power - Peak Pulse | 400 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Package / Case | DO-214AC, SMA | — |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitute parts for the SMAJ26A-E3/5A are classified based on the following substitution criteria:
Primary Substitution Parameters:
- Voltage - Reverse Standoff (Typ): 26V
- Voltage - Breakdown (Min): 28.9V
- Voltage - Clamping (Max) @ Ipp: 42.1V (±tolerance acceptable)
- Current - Peak Pulse (10/1000µs): 9.5A (minimum requirement)
- Power - Peak Pulse: 400W (minimum requirement)
- Package / Case: DO-214AC, SMA (surface mount compatibility)
- Mounting Type: Surface Mount
- RoHS Status: ROHS3 Compliant
- Moisture Sensitivity Level (MSL): 1 (Unlimited)
Grouping Categories:
Group 1: Direct Electrical & Packaging Equivalents Parts with identical voltage ratings, clamping characteristics, and DO-214AC (SMA) package configuration. These parts are fully interchangeable with the main part number.
Group 2: Equivalent Voltage Ratings with Higher Current Capability Parts maintaining the same voltage specifications but with increased peak pulse current ratings (14.3A or higher). These provide enhanced transient protection capability while maintaining electrical compatibility.
Group 3: Automotive-Grade Equivalents Parts meeting AEC-Q101 automotive qualification with equivalent electrical specifications. These are suitable for applications requiring automotive-grade reliability.
Group 4: Alternative Package Configurations Parts with equivalent electrical specifications but different surface mount packages (SOD-123W). These require PCB layout modification but maintain electrical functionality.
Group 5: Higher Clamping Voltage Variants Parts with the same reverse standoff voltage but higher clamping voltages and increased current ratings. These are suitable only when circuit design permits higher transient voltage levels.
Parameter Comparison
| Part Number | Manufacturer | Vwm (Typ) V | Vbr (Min) V | Vc (Max) @ Ipp V | Ipp (10/1000µs) A | Ppk W | Package | Temp Range °C | Status |
|---|---|---|---|---|---|---|---|---|---|
| SMAJ26A-E3/5A | Vishay | 26 | 28.9 | 42.1 | 9.5 | 400 | DO-214AC (SMA) | -55 to 150 (TJ) | Active |
| SMAJ26A-E3/61 | Vishay | 26 | 28.9 | 42.1 | 9.5 | 400 | DO-214AC (SMA) | -55 to 150 (TJ) | Active |
| SMAJ26A-13-F | Diodes Incorporated | 26 | 28.9 | 42.1 | 9.5 | 400 | DO-214AC (SMA) | -55 to 150 (TJ) | Active |
| SMAJ26A-TP | Micro Commercial Co | 26 | 28.9 | 42.1 | 9.5 | 400 | DO-214AC (SMA) | -55 to 175 (TA) | Active |
| SZ1SMA26AT3G | Littelfuse Inc. | 26 | 28.9 | 42.1 | 9.5 | 400 | DO-214AC (SMA) | -65 to 150 (TJ) | Active |
| PTVS26VS1UR,115 | Nexperia USA Inc. | 26 | 28.9 | 42.1 | 9.5 | 400 | SOD-123W | -55 to 150 (TA) | Active |
| SM4T30AY | STMicroelectronics | 26 | 28.9 | 53.5 | 43 (8/20µs) | 400 | DO-214AC (SMA) | -55 to 150 (TJ) | Active |
| SMA6J26A R3G | Taiwan Semiconductor Corporation | 26 | 28.9 | 40.9 | 14.7 | 600 | DO-214AC (SMA) | -55 to 175 (TJ) | Discontinued |
| SMA6J26A-TP | Micro Commercial Co | 26 | 28.9 | 42.1 | 14.3 | 600 | DO-214AC (SMA) | -55 to 175 (TA) | Active |
| SMA6J26A-TR | STMicroelectronics | 26 | 28.9 | 47.9 | 75 (8/20µs) | 600 | DO-214AC (SMA) | -55 to 175 (TJ) | Active |
| SMA6J26AHR3G | Taiwan Semiconductor Corporation | 26 | 28.9 | 40.9 | 14.7 | 600 | DO-214AC (SMA) | -55 to 175 (TJ) | Discontinued |
Engineering Selection Recommendations
Group 1 - Direct Equivalents (Recommended for Drop-In Replacement):
SMAJ26A-E3/61, SMAJ26A-13-F, and SMAJ26A-TP are fully equivalent to the main part number SMAJ26A-E3/5A. These parts maintain identical electrical specifications and package configuration. Selection among these parts is determined by packaging format availability (Tape & Reel vs. Cut Tape & Digi-Reel) and inventory status. All are ROHS3 compliant with MSL 1 rating.
Group 2 - Enhanced Current Capability (Conditional Substitution):
SMA6J26A-TP and SMA6J26A-TR provide higher peak pulse current ratings (14.3A and 75A respectively) while maintaining the 26V reverse standoff voltage. These parts are suitable for applications requiring greater transient energy absorption. The higher power dissipation capability (600W vs. 400W) accommodates more severe transient events. Both are ROHS3 compliant and rated to -55°C to 175°C.
Group 3 - Automotive-Grade Options (AEC-Q101 Qualified):
SZ1SMA26AT3G (Littelfuse) and SMA6J26AHR3G (Taiwan Semiconductor Corporation) carry AEC-Q101 automotive qualification. These parts are suitable for automotive and industrial applications requiring formal qualification documentation. SZ1SMA26AT3G extends the lower operating temperature to -65°C.
Group 4 - Alternative Package (SOD-123W):
PTVS26VS1UR,115 (Nexperia) provides equivalent electrical specifications in the SOD-123W package. This part requires PCB layout modification and is suitable only when space constraints or design requirements mandate a smaller package footprint. Nexperia qualification includes AEC-Q101 automotive grade.
Group 5 - Higher Clamping Voltage (Limited Substitution):
SM4T30AY (STMicroelectronics) maintains the 26V reverse standoff voltage but exhibits a higher clamping voltage of 53.5V with significantly increased peak pulse current (43A at 8/20µs). This part is suitable only when circuit design permits higher transient voltage levels and requires enhanced current handling. AEC-Q101 qualified.
Discontinued Parts:
SMA6J26A R3G and SMA6J26AHR3G are discontinued at DiGi Electronics. While inventory remains available, these parts should not be selected for new designs. Active alternatives from the same manufacturers are preferred.
Frequently Asked Questions (FAQ)
Q: Can SMAJ26A-E3/61 be used as a direct replacement for SMAJ26A-E3/5A?
A: Yes. Both parts are manufactured by Vishay with identical electrical specifications (26V Vwm, 28.9V Vbr, 42.1V Vc, 9.5A Ipp, 400W Ppk). The difference is packaging format: SMAJ26A-E3/5A is supplied in Tape & Reel (TR), while SMAJ26A-E3/61 is supplied in Cut Tape (CT) & Digi-Reel. Electrical performance is identical.
Q: What is the difference between SMAJ26A-TP and SMA6J26A-TP?
A: Both are manufactured by Micro Commercial Co in DO-214AC (SMA) package with 26V reverse standoff voltage. SMAJ26A-TP has 9.5A peak pulse current and 400W power rating. SMA6J26A-TP has 14.3A peak pulse current and 600W power rating, providing enhanced transient protection capability. SMA6J26A-TP is suitable for applications requiring higher energy absorption.
Q: Can I use SMA6J26A-TR instead of SMAJ26A-E3/5A?
A: SMA6J26A-TR is electrically compatible for the 26V reverse standoff voltage specification. However, it exhibits a higher clamping voltage (47.9V vs. 42.1V) and significantly higher peak pulse current (75A at 8/20µs). This part is suitable only if circuit design permits the higher clamping voltage. Verify that downstream components can tolerate the increased transient voltage level.
Q: Is PTVS26VS1UR,115 compatible with the original part?
A: PTVS26VS1UR,115 maintains identical electrical specifications but uses the SOD-123W package instead of DO-214AC (SMA). This requires PCB layout modification. The part is electrically compatible but not a direct drop-in replacement due to different package footprint and pin configuration.
Q: Are the discontinued parts (SMA6J26A R3G, SMA6J26AHR3G) still usable?
A: Discontinued parts remain functionally equivalent to the main part number. However, for new designs, active alternatives should be selected to ensure long-term supply chain availability and manufacturer support. Existing inventory of discontinued parts may be used for repair or legacy system maintenance.
Q: What does AEC-Q101 qualification mean?
A: AEC-Q101 is an automotive industry qualification standard for discrete semiconductors. Parts carrying this qualification (SZ1SMA26AT3G, PTVS26VS1UR,115, SM4T30AY, SMA6J26AHR3G) have undergone rigorous testing for reliability, temperature cycling, and performance consistency. These parts are suitable for automotive and high-reliability industrial applications.
Q: Can I substitute a higher current-rated part (SMA6J26A-TP with 14.3A) for the original 9.5A part?
A: Yes, if circuit design permits. Higher current-rated parts provide enhanced transient protection without compromising electrical compatibility at the 26V reverse standoff voltage. The higher current capability means the part can absorb more transient energy. Verify that the application benefits from this enhanced capability and that no design constraints are violated.
Q: What is the significance of the operating temperature range difference between parts?
A: Operating temperature range affects part reliability in extreme environments. SMAJ26A-TP and SMA6J26A-TP extend to 175°C (TA), while the main part is rated to 150°C (TJ). SZ1SMA26AT3G extends the lower limit to -65°C. Select based on actual application temperature requirements. Higher temperature ratings provide margin for thermal stress but do not change electrical performance at nominal operating conditions.
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