Request Quote
(Ships tomorrow)
SMCJ26 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts
Part Overview
The SMCJ26 is a unidirectional Zener transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface mount applications. The device features a 26V reverse standoff voltage with a 44.21V maximum clamping voltage at peak pulse current of 35.7A, housed in a DO-214AB (SMC) package. The SMCJ26 is classified as obsolete; equivalent and substitute parts listed below provide active alternatives with compatible electrical and mechanical specifications for direct replacement in circuit designs.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Voltage - Reverse Standoff (Typ) | 26 | V |
| Voltage - Breakdown (Min) | 27.36 | V |
| Voltage - Clamping (Max) @ Ipp | 44.21 | V |
| Current - Peak Pulse (10/1000µs) | 35.7 | A |
| Power - Peak Pulse | 1500 | W |
| Operating Temperature Range | -55 to 150 | °C |
| Mounting Type | Surface Mount | — |
| Package / Case | DO-214AB, SMC | — |
| Type | Zener | — |
| Unidirectional Channels | 1 | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
Substitute Part Grouping Explanation
Substitution of the SMCJ26 is determined by the following critical parameters:
- Voltage - Reverse Standoff: Must be 26V (±tolerance as specified by manufacturer)
- Voltage - Clamping (Max) @ Ipp: Must be within the range 42.1V to 44.21V to ensure equivalent overvoltage protection
- Current - Peak Pulse (10/1000µs): Must be ≥35.6A to handle transient surge events
- Power - Peak Pulse: Must be ≥1500W for adequate energy dissipation
- Package / Case: Must be DO-214AB or SMC (equivalent surface mount packages)
- Mounting Type: Must be Surface Mount
- Type: Must be Zener diode, unidirectional (1 channel)
- RoHS Status: Must be ROHS3 Compliant
- Moisture Sensitivity Level: Must be MSL 1 (Unlimited)
Substitute parts are grouped into two categories: direct equivalents with clamping voltage of 42.1V (lower than original 44.21V but within acceptable protection range), and higher-power variants with increased peak pulse current capability. All listed substitutes maintain the 26V reverse standoff voltage and DO-214AB package form factor.
Parameter Comparison
| Part Number | Manufacturer | Voltage - Reverse Standoff (V) | Voltage - Clamping (Max) @ Ipp (V) | Current - Peak Pulse (A) | Power - Peak Pulse (W) | Operating Temp (°C) | Product Status | Package |
|---|---|---|---|---|---|---|---|---|
| SMCJ26 | Littelfuse Inc. | 26 | 44.21 | 35.7 | 1500 | -55 to 150 | Obsolete | DO-214AB, SMC |
| SMCJ26A | MDD | 26 | 42.1 | 35.7 | 1500 | -50 to 150 | Active | DO-214AB, SMC |
| SZ1SMC26AT3G | Littelfuse Inc. | 26 | 42.1 | 35.6 | 1500 | -65 to 150 | Active | DO-214AB, SMC |
| SMCJ26A-13-F | Diodes Incorporated | 26 | 42.1 | 35.6 | 1500 | -55 to 150 | Active | DO-214AB, SMC |
| SMCJ26A-TP | Micro Commercial Co | 26 | 42.1 | 35.7 | 1500 | -55 to 175 | Active | DO-214AB, SMC |
| SMCJ26AE3/TR13 | Microchip Technology | 26 | 42.1 | 35.6 | 1500 | -65 to 150 | Active | DO-214AB, SMC |
| SMCJ26E3/TR13 | Microchip Technology | 26 | 46.6 | 32.2 | 1500 | -65 to 150 | Active | DO-214AB, SMC |
| SMLJ26A | Bourns Inc. | 26 | 42.1 | 71.2 | 3000 | -55 to 150 | Active | DO-214AB, SMC |
| SMLJ26AE3/TR13 | Microchip Technology | 26 | 42.1 | 71.2 | 300 | -55 to 150 | Active | DO-214AB, SMC |
Engineering Selection Recommendations
Primary Substitutes (Direct Equivalents)
SMCJ26A (MDD), SZ1SMC26AT3G (Littelfuse Inc.), SMCJ26A-13-F (Diodes Incorporated), SMCJ26A-TP (Micro Commercial Co), and SMCJ26AE3/TR13 (Microchip Technology) are direct functional equivalents. All maintain the 26V reverse standoff voltage, 42.1V clamping voltage, 35.6–35.7A peak pulse current, and 1500W peak pulse power. These parts are in active production status and ROHS3 compliant. Selection among these options depends on availability, lead time, and temperature range requirements. SZ1SMC26AT3G and SMCJ26AE3/TR13 offer extended low-temperature operation (-65°C), while SMCJ26A-TP supports elevated temperatures to 175°C.
Higher-Power Alternatives
SMLJ26A (Bourns Inc.) and SMLJ26AE3/TR13 (Microchip Technology) provide increased peak pulse current (71.2A) and power dissipation (3000W for SMLJ26A), suitable for applications requiring enhanced transient surge protection. These parts maintain the same 26V reverse standoff and 42.1V clamping voltage but are rated for higher energy events. SMLJ26A is preferred for standard applications due to its 3000W power rating; SMLJ26AE3/TR13 has a reduced power rating (300W) and should be evaluated against application requirements.
Variant with Modified Clamping Voltage
SMCJ26E3/TR13 (Microchip Technology) features a higher clamping voltage of 46.6V with reduced peak pulse current (32.2A). This variant is suitable only if circuit design permits the higher clamping voltage and lower current handling is acceptable.
All recommended substitutes are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with standard manufacturing and storage conditions.
Frequently Asked Questions (FAQ)
Q: Can SMCJ26A directly replace SMCJ26 in existing designs?
A: Yes. SMCJ26A maintains the critical electrical parameters: 26V reverse standoff voltage, 42.1V clamping voltage (within acceptable tolerance of the original
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