SMDJ90 Equivalent & Substitute Parts

Part Overview

The SMDJ90 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 90V reverse standoff voltage with a 153.3V maximum clamping voltage and 20.5A peak pulse current capability in a DO-214AB (SMC) package. The SMDJ90 is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for ongoing design support and production requirements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	90	V
Voltage - Breakdown (Min)	94.95	V
Voltage - Clamping (Max) @ Ipp	153.3	V
Current - Peak Pulse (10/1000µs)	20.5	A
Power - Peak Pulse	3000	W
Package / Case	DO-214AB, SMC	—
Operating Temperature Range	-65 to 150	°C
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—

Substitute Part Grouping Explanation

Substitution of the SMDJ90 is determined by the following critical parameters:

Voltage - Reverse Standoff: 90V nominal
Voltage - Clamping (Max) @ Ipp: Range 146V to 153.3V
Current - Peak Pulse (10/1000µs): 10.3A to 20.6A
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Type: Zener, Unidirectional (1 channel)

Substitute parts are grouped into two categories based on peak pulse current capability:

Category A (Higher Current Rating): Parts rated at 20.5A to 20.6A peak pulse current with 3000W peak pulse power. These include SMDJ90A, SMLJ90A, SMLJ90A-TP, SMLJ90AE3/TR13, and TV30C900J-G.

Category B (Lower Current Rating): Parts rated at 10.3A to 10.27A peak pulse current with 1500W peak pulse power. These include SMCJ90A, SMCJ90A, and TV15C900J-G.

All substitute parts maintain the 90V reverse standoff voltage, DO-214AB (SMC) package, surface-mount configuration, and unidirectional zener diode topology. Clamping voltage specifications range from 146V to 153.3V, all within acceptable substitution parameters.

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)	Package	Status
SMDJ90	Littelfuse Inc.	90	94.95	153.3	20.5	3000	-65 to 150	DO-214AB, SMC	Obsolete
SMDJ90A	Alpha & Omega Semiconductor Inc.	90	100	146	20.6	3000	-55 to 150	DO-214AB, SMC	Active
SMCJ90A	Fairchild Semiconductor	90	100	146	10.3	1500	-55 to 150	DO-214AB, SMC	Active
SMCJ90AE3/TR13	Microchip Technology	90	100	146	10.3	1500	-65 to 150	DO-214AB, SMC	Active
SMLJ90A	Bourns Inc.	90	100	146	20.6	3000	-55 to 150	DO-214AB, SMC	Active
SMLJ90A-TP	Micro Commercial Co	90	100	146	20.6	3000	-55 to 175	DO-214AB, SMC	Active
SMLJ90AE3/TR13	Microchip Technology	90	100	146	20.6	300	-55 to 150	DO-214AB, SMC	Active
TV15C900J-G	Comchip Technology	90	100	146	10.27	1500	-55 to 150	DO-214AB, SMC	Active
TV30C900J-G	Comchip Technology	90	100	146	20.55	3000	-55 to 150	DO-214AB, SMC	Active

Engineering Selection Recommendations

Primary Substitutes (Matched Current Rating):

For applications requiring 20.5A peak pulse current capability equivalent to the original SMDJ90, select from SMDJ90A, SMLJ90A, SMLJ90A-TP, SMLJ90AE3/TR13, or TV30C900J-G. All are active products with ROHS3 compliance. SMDJ90A and TV30C900J-G offer the widest availability. SMLJ90A-TP extends the operating temperature range to 175°C for high-temperature applications.

Secondary Substitutes (Reduced Current Rating):

For applications where 10.3A peak pulse current is acceptable, SMCJ90A, SMCJ90AE3/TR13, or TV15C900J-G provide active alternatives with lower power dissipation (1500W). SMCJ90AE3/TR13 maintains the original -65°C lower temperature limit.

Compliance Considerations:

All substitute parts are ROHS3 compliant. SMLJ90A and SMLJ90AE3/TR13 are REACH Affected; SMDJ90A, SMCJ90AE3/TR13, SMLJ90A-TP, TV15C900J-G, and TV30C900J-G are REACH Unaffected. All parts carry EAR99 export classification and HTSUS code 8541.10.0080.

Frequently Asked Questions (FAQ)

Q: Can SMCJ90A replace SMDJ90 directly?

A: SMCJ90A is electrically compatible in terms of voltage parameters (90V standoff, 146V clamping) and package (DO-214AB, SMC). However, it is rated for 10.3A peak pulse current versus the original 20.5A. Use SMCJ90A only if your application does not require the full 20.5A pulse current capability.

Q: What is the difference between SMDJ90A and SMLJ90A?

A: Both parts are rated for 90V standoff, 146V clamping, and 20.6A peak pulse current in DO-214AB (SMC) packages. SMDJ90A is manufactured by Alpha & Omega Semiconductor Inc., while SMLJ90A is manufactured by Bourns Inc. Both are active products with equivalent electrical specifications.

Q: Does operating temperature range affect substitution?

A: The original SMDJ90 operates from -65°C to 150°C. Most substitutes operate from -55°C to 150°C, which is acceptable for most applications. SMCJ90AE3/TR13 and SMLJ90A-TP maintain the -65°C lower limit. SMLJ90A-TP extends to 175°C for high-temperature environments.

Q: Are all substitute parts available in Tape & Reel packaging?

A: Tape & Reel packaging is available for SMDJ90A, SMCJ90AE3/TR13, SMLJ90A, SMLJ90AE3/TR13, TV15C900J-G, and TV30C900J-G. SMCJ90A and SMLJ90A-TP are supplied in Bulk packaging.

Q: What is the significance of the clamping voltage difference (153.3V vs. 146V)?

A: The original SMDJ90 specifies 153.3V maximum clamping voltage, while most substitutes specify 146V. Both values fall within acceptable transient suppression parameters for 90V standoff applications. The lower clamping voltage of substitute parts provides slightly tighter voltage regulation.

Q: Which substitute offers the best inventory availability?

A: SMCJ90A (Fairchild Semiconductor) and SMLJ90A (Bourns Inc.) each have 30,200 and 15,100 units in stock respectively, providing the highest availability among active substitutes.

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