SMBJ75 Transient Voltage Suppressor (TVS) Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ75 is a unidirectional Zener-type transient voltage suppressor diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. The device features a 75V reverse standoff voltage rating with a 127.05V maximum clamping voltage at peak pulse current. Housed in a DO-214AA (SMB) surface mount package, the SMBJ75 is classified as obsolete product status. Due to its obsolescence, equivalent substitute parts from active manufacturers are necessary to maintain design continuity and ensure long-term component availability for new production and field replacements.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	75	V
Voltage - Breakdown (Min)	78.93	V
Voltage - Clamping (Max) @ Ipp	127.05	V
Current - Peak Pulse (10/1000µs)	5	A
Power - Peak Pulse	600	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Type	Zener	—
Unidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SMBJ75 are qualified based on the following critical electrical and mechanical parameters:

Voltage - Reverse Standoff (Typ): 75V
Voltage - Clamping (Max) @ Ipp: 121V to 127.05V range
Current - Peak Pulse (10/1000µs): 4.9A to 5A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB (surface mount)
Mounting Type: Surface Mount
Type: Zener, Unidirectional (1 channel)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

All substitute parts maintain identical reverse standoff voltage, peak pulse power rating, and package form factor. Clamping voltage and peak pulse current specifications remain within acceptable operational tolerances across all qualified substitutes. All substitutes are active product status from established manufacturers, ensuring ongoing availability and supply chain continuity.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status	RoHS Status
SMBJ75	Littelfuse Inc.	75V	127.05V	5A	600W	-65 to 150°C (TJ)	DO-214AA, SMB	Obsolete	ROHS3 Compliant
SMBJ75A	Meritek	75V	121V	4.96A	600W	-55 to 150°C	DO-214AA (SMB)	Active	ROHS3 Compliant
SMBJ75A-13-F	Diodes Incorporated	75V	121V	4.9A	600W	-55 to 150°C (TJ)	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ75A-E3/5B	Vishay General Semiconductor - Diodes Division	75V	121V	5A	600W	-55 to 150°C (TJ)	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ75A-M3/52	Vishay General Semiconductor - Diodes Division	75V	121V	5A	600W	-55 to 150°C (TJ)	DO-214AA, SMB	Active	ROHS3 Compliant
SMBJ75A-M3/5B	Vishay General Semiconductor - Diodes Division	75V	121V	5A	600W	-55 to 150°C (TJ)	DO-214AA, SMB	Active	ROHS3 Compliant

Engineering Selection Recommendations

All qualified substitute parts are active product status from established semiconductor manufacturers, ensuring long-term availability and supply chain reliability. The SMBJ75A from Meritek, SMBJ75A-13-F from Diodes Incorporated, and the Vishay TransZorb® variants (SMBJ75A-E3/5B, SMBJ75A-M3/52, SMBJ75A-M3/5B) are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings, meeting modern environmental and regulatory requirements.

Clamping voltage specifications across substitutes range from 121V to 127.05V, representing a 4.9% maximum deviation from the original SMBJ75 specification. Peak pulse current ratings span 4.9A to 5A, within 2% tolerance. These variations remain within acceptable operational margins for general-purpose transient voltage suppression applications.

The Vishay variants offer the closest electrical match to the original SMBJ75, with 5A peak pulse current and clamping voltages of 121V. Diodes Incorporated and Meritek alternatives provide equivalent functional performance with slightly lower peak pulse current specifications (4.9A to 4.96A), suitable for applications with less stringent current handling requirements.

Frequently Asked Questions (FAQ)

Q: Can SMBJ75A substitute parts be used directly in place of the obsolete SMBJ75?

A: Yes. All qualified substitutes maintain the same 75V reverse standoff voltage, 600W peak pulse power rating, and DO-214AA (SMB) surface mount package. Electrical performance differences are minimal and within acceptable operational tolerances for general-purpose overvoltage protection circuits.

Q: What is the significance of the clamping voltage difference between SMBJ75 (127.05V) and substitute parts (121V)?

A: The 6.05V difference represents approximately 4.9% deviation. Both values fall within the acceptable clamping voltage range for 75V-rated TVS diodes and do not compromise circuit protection performance. The lower clamping voltage of substitutes may provide marginally faster transient suppression in some applications.

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

A: Vishay variants (SMBJ75A-E3/5B, SMBJ75A-M3/52, SMBJ75A-M3/5B) and Diodes Incorporated SMBJ75A-13-F are supplied in Tape & Reel packaging. Meritek SMBJ75A availability in TR format should be confirmed with the supplier.

Q: What is the operating temperature difference between the original SMBJ75 and substitutes?

A: The original SMBJ75 operates from -65°C to 150°C (TJ). All substitute parts operate from -55°C to 150°C (TJ). The upper temperature limit remains identical. The lower temperature limit difference of 10°C is not significant for most general-purpose applications operating within standard industrial temperature ranges.

Q: Do all substitute parts meet current environmental compliance standards?

A: Yes. All qualified substitutes are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity ratings. Vishay and Diodes Incorporated variants carry REACH Unaffected status, confirming compliance with European chemical regulations.

Q: What packaging considerations apply when switching from SMBJ75 to substitute parts?

A: All substitutes use identical DO-214AA (SMB) surface mount package geometry. PCB footprints, solder pad layouts, and pick-and-place machine compatibility remain unchanged. No circuit board redesign is required for component substitution.

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