SMBJ85 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ85 is a unidirectional Zener-type transient voltage suppressor manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features an 85V reverse standoff voltage with a 143.85V maximum clamping voltage and 4.4A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ85 is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. Active alternatives from other manufacturers provide functionally equivalent protection characteristics while maintaining compatibility with existing PCB layouts and assembly processes.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	85	V
Voltage - Breakdown (Min)	89.28	V
Voltage - Clamping (Max) @ Ipp	143.85	V
Current - Peak Pulse (10/1000µs)	4.4	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMBJ85 is determined by strict alignment of the following electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): Must be 85V to maintain circuit protection threshold
Voltage - Clamping (Max) @ Ipp: Must not exceed 143.85V to ensure adequate transient suppression
Current - Peak Pulse (10/1000µs): Must support minimum 4.4A to handle specified surge conditions
Power - Peak Pulse: Must maintain 600W dissipation capability
Package / Case: Must be DO-214AA (SMB) for PCB footprint compatibility
Mounting Type: Must be Surface Mount for assembly process compatibility
RoHS Status: Must maintain ROHS3 compliance for regulatory requirements

All substitute parts listed below meet these criteria within the specified tolerances.

Parameter Comparison

Parameter	SMBJ85 (Littelfuse)	SMBJ85A (Meritek)	SMBJ85A-13-F (Diodes Inc.)	SMBJ85A-E3/5B (Vishay)
Manufacturer	Littelfuse Inc.	Meritek	Diodes Incorporated	Vishay General Semiconductor
Product Status	Obsolete	Active	Active	Active
Voltage - Reverse Standoff (Typ)	85V	85V	85V	85V
Voltage - Breakdown (Min)	89.28V	94.4V	94.4V	94.4V
Voltage - Clamping (Max) @ Ipp	143.85V	137V	137V	137V
Current - Peak Pulse (10/1000µs)	4.4A	4.38A	4.4A	4.4A
Power - Peak Pulse	600W	600W	600W	600W
Operating Temperature Range	-65 to 150°C (TJ)	-55 to 150°C	-55 to 150°C (TJ)	-55 to 150°C (TJ)
Package / Case	DO-214AA, SMB	DO-214AA (SMB)	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SMBJ85A (Meritek): Active product status with full ROHS3 compliance and REACH unaffected designation. Suitable for new production designs requiring immediate availability. Operating temperature range of -55 to 150°C meets standard industrial requirements.

SMBJ85A-13-F (Diodes Incorporated): Manufacturer-recommended substitute with active product status. Supplied in Tape & Reel packaging for automated assembly processes. Full ROHS3 and REACH compliance. Highest inventory availability (4344 pcs) supports volume production requirements.

SMBJ85A-E3/5B (Vishay General Semiconductor - Diodes Division): Manufacturer-recommended substitute designated as TransZorb® series. Active product status with full ROHS3 and REACH compliance. Supplied in Tape & Reel packaging. Largest inventory position (7008 pcs) ensures supply chain continuity.

All three substitute parts maintain electrical performance within specified parameters and package compatibility with the obsolete SMBJ85. Selection should be based on supplier availability, lead time requirements, and existing qualification status within your organization.

Frequently Asked Questions (FAQ)

Q: Can SMBJ85A (Meritek) directly replace SMBJ85 (Littelfuse) without PCB modification?

A: Yes. Both devices use identical DO-214AA (SMB) package geometry and surface-mount footprint. No PCB layout changes are required.

Q: What is the difference between the clamping voltage specifications (143.85V vs 137V)?

A: The SMBJ85 specifies a maximum clamping voltage of 143.85V, while substitute parts specify 137V maximum. The lower clamping voltage of substitute parts provides improved transient suppression performance and remains within acceptable circuit protection parameters.

Q: Are there operating temperature differences between substitute options?

A: The SMBJ85 operates from -65°C to 150°C (TJ), while all substitute parts operate from -55°C to 150°C (TJ). The substitute parts have a 10°C higher minimum operating temperature. Verify this meets your application's low-temperature requirements.

Q: Do all substitute parts have the same peak pulse current rating?

A: SMBJ85A (Meritek) is rated at 4.38A peak pulse current, while SMBJ85A-13-F (Diodes Inc.) and SMBJ85A-E3/5B (Vishay) are rated at 4.4A. Both ratings are functionally equivalent for general-purpose transient suppression applications.

Q: Which substitute part has the best supply availability?

A: SMBJ85A-E3/5B (Vishay) has the highest inventory position at 7008 pcs, followed by SMBJ85A-13-F (Diodes Inc.) at 4344 pcs, and SMBJ85A (Meritek) at 2060 pcs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and meet current environmental and regulatory requirements.

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