SMDJ26 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMDJ26 is a unidirectional 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 71.3A, housed in a DO-214AB (SMC) package. The SMDJ26 is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

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)	71.3	A
Power - Peak Pulse	3000	W
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature Range	-65 to 150	°C
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMDJ26 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Reverse standoff voltage: 26V (nominal)
Breakdown voltage minimum: 27.36V to 28.9V range
Package type: DO-214AB (SMC) surface mount
Unidirectional configuration: 1 channel
Zener diode type
RoHS3 compliance
Moisture sensitivity level: 1 (Unlimited)

Performance Tolerance Parameters:

Clamping voltage: 42.1V to 44.21V at peak pulse current
Peak pulse current: 35.6A to 71.3A (10/1000µs waveform)
Peak pulse power: 1500W to 3000W
Operating temperature: -65°C to 175°C (device-dependent)

Substitute parts are grouped into two categories based on peak pulse current and power dissipation capability: high-current devices (71.2A–71.3A, 3000W) and standard-current devices (35.6A–35.7A, 1500W). Both categories maintain electrical equivalence at the 26V standoff specification and are mechanically compatible with the original DO-214AB footprint.

Parameter Comparison

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
SMDJ26	Littelfuse Inc.	26	27.36	44.21	71.3	3000	-65 to 150	Obsolete
SMDJ26A	Alpha & Omega Semiconductor Inc.	26	28.9	42.1	71.3	3000	-55 to 150	Active
SMCJ26A	MDD	26	28.9	42.1	35.7	1500	-50 to 150	Active
SMCJ26A-TP	Micro Commercial Co	26	28.9	42.1	35.7	1500	-55 to 175	Active
SMCJ26AE3/TR13	Microchip Technology	26	28.9	42.1	35.6	1500	-65 to 150	Active
SMLJ26A	Bourns Inc.	26	28.9	42.1	71.2	3000	-55 to 150	Active
SMLJ26AE3/TR13	Microchip Technology	26	28.9	42.1	71.2	300	-55 to 150	Active
TV15C260J-G	Comchip Technology	26	28.9	42.1	35.63	1500	-55 to 150	Active
TV15C260J-HF	Comchip Technology	26	28.9	42.1	35.63	1500	-55 to 150	Active
TV30C260J-G	Comchip Technology	26	28.9	42.1	71.26	3000	-55 to 150	Active

Engineering Selection Recommendations

For Direct Replacement (Highest Compatibility):

SMDJ26A (Alpha & Omega Semiconductor Inc.) provides the closest electrical match with identical peak pulse current (71.3A) and power dissipation (3000W). The device maintains the 26V standoff specification and is RoHS3 compliant. Operating temperature range is -55°C to 150°C, which covers most industrial applications. This part is recommended as the primary substitute for the obsolete SMDJ26.

For High-Current Applications (3000W Power Rating):

SMLJ26A (Bourns Inc.) and TV30C260J-G (Comchip Technology) both deliver 71.2A–71.26A peak pulse current with 3000W power dissipation, matching the original SMDJ26 performance envelope. Both are active products with RoHS3 compliance. SMLJ26A is subject to REACH regulations; TV30C260J-G is REACH unaffected. Operating temperature ranges are -55°C to 150°C for both devices.

For Standard-Current Applications (1500W Power Rating):

SMCJ26A-TP (Micro Commercial Co), SMCJ26AE3/TR13 (Microchip Technology), TV15C260J-G, and TV15C260J-HF (Comchip Technology) all provide 35.6A–35.7A peak pulse current with 1500W power dissipation. These devices are suitable for applications where the original 3000W specification is not required. SMCJ26A-TP offers the widest operating temperature range (-55°C to 175°C). All are RoHS3 compliant and REACH unaffected.

Product Status Consideration:

All recommended substitutes are active products with ongoing manufacturer support, ensuring long-term availability and supply chain stability compared to the obsolete SMDJ26.

Frequently Asked Questions (FAQ)

Q: Can I use a 1500W-rated substitute (SMCJ26A-TP, SMCJ26AE3/TR13, TV15C260J-G, TV15C260J-HF) in place of the original SMDJ26 (3000W)?

A: Substitution depends on your circuit's transient energy requirements. The 1500W devices maintain the same 26V standoff voltage and 42.1V clamping voltage, ensuring voltage regulation equivalence. However, if your application generates transient pulses exceeding 1500W, the lower-rated devices may not provide adequate energy absorption. Verify your circuit's peak pulse power specification before selecting a 1500W substitute.

Q: Are all substitute parts mechanically compatible with the SMDJ26 footprint?

A: Yes. All listed substitutes use the DO-214AB (SMC) surface-mount package, which is mechanically and electrically compatible with the original SMDJ26 footprint. No PCB layout modifications are required.

Q: What is the difference between SMLJ26AE3/TR13 (300W) and other high-current devices?

A: SMLJ26AE3/TR13 is listed with 300W peak pulse power, which is inconsistent with its 71.2A peak pulse current specification. This represents a data anomaly. For applications requiring high-current transient suppression, SMLJ26A (Bourns Inc., 3000W) or TV30C260J-G (Comchip Technology, 3000W) are recommended instead.

Q: Which substitute offers the widest operating temperature range?

A: SMCJ26A-TP (Micro Commercial Co) operates from -55°C to 175°C, providing the widest temperature envelope among all substitutes. This is beneficial for applications in extreme thermal environments.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts are RoHS3 compliant. SMLJ26A (Bourns Inc.) is subject to REACH regulations; all other substitutes are REACH unaffected.

Q: What packaging options are available for the substitutes?

A: Most substitutes are supplied in Tape & Reel (TR) packaging for automated assembly. SMCJ26A (MDD) does not specify packaging format. Verify packaging requirements with your procurement process before finalizing part selection.

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