SMBJ7.5 Equivalent & Substitute Parts

Part Overview

The SMBJ7.5 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 7.5V reverse standoff voltage with a 14.65V maximum clamping voltage at peak pulse current, housed in a DO-214AA (SMB) package. The SMBJ7.5 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	7.5	V
Voltage - Breakdown (Min)	7.89	V
Voltage - Clamping (Max) @ Ipp	14.65	V
Current - Peak Pulse (10/1000µs)	46.6	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	—

Substitute Part Grouping Explanation

Substitution of the SMBJ7.5 is determined by the following critical parameters:

Voltage - Reverse Standoff (Typ): 7.5V
Voltage - Clamping (Max) @ Ipp: 12.9V to 14.65V range
Current - Peak Pulse (10/1000µs): 46.5A to 46.6A
Power - Peak Pulse: 600W
Package / Case: DO-214AA or SMB
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Substitute parts must maintain identical reverse standoff voltage (7.5V) and equivalent clamping voltage performance within the specified range. Peak pulse current and power dissipation must remain at or above the original specification. All substitutes are packaged in DO-214AA (SMB) surface-mount format and comply with ROHS3 requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status	Package
SMBJ7.5	Littelfuse Inc.	7.5V	14.65V	46.6A	600W	-65 to 150°C	Obsolete	DO-214AA (SMBJ)
SMBJ7.5A	MDD	7.5V	12.9V	46.6A	600W	-50 to 150°C	Active	SMB/DO-214AA
SZ1SMB7.5AT3G	Littelfuse Inc.	7.5V	12.9V	46.5A	600W	-65 to 150°C	Active	SMB
SMBJ7.5A-13-F	Diodes Incorporated	7.5V	12.9V	46.5A	600W	-55 to 150°C	Active	SMB
SMBJ7.5A-E3/5B	Vishay General Semiconductor - Diodes Division	7.5V	12.9V	46.5A	600W	-55 to 150°C	Active	DO-214AA (SMBJ)
SMBJ7V5A	Taiwan Semiconductor Corporation	7.5V	12.9V	46.5A	600W	-55 to 150°C	Active	DO-214AA (SMB)

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance, making them suitable for new designs and ongoing production support. The SMBJ7.5A (MDD) and SMBJ7.5A-13-F (Diodes Incorporated) offer the highest inventory availability and active product status. SZ1SMB7.5AT3G (Littelfuse Inc.) maintains the original manufacturer's design with automotive-grade qualification (AEC-Q101) and extended temperature range (-65 to 150°C), matching the original SMBJ7.5 operating range. SMBJ7.5A-E3/5B (Vishay) provides TransZorb® series compatibility for applications requiring established supplier relationships.

Clamping voltage differences between the original (14.65V) and substitutes (12.9V) represent a 4.8% reduction, which remains within acceptable tolerance for general-purpose transient suppression applications where the primary function is overvoltage protection at the specified standoff voltage.

Frequently Asked Questions (FAQ)

Q: Can SMBJ7.5A (MDD) directly replace SMBJ7.5 (Littelfuse)?

A: Yes. Both parts maintain 7.5V reverse standoff voltage, 46.6A peak pulse current, and 600W power dissipation in DO-214AA (SMB) packaging. The clamping voltage difference (12.9V vs. 14.65V) is within acceptable tolerance for general-purpose applications.

Q: What is the significance of the clamping voltage difference?

A: The original SMBJ7.5 clamps at 14.65V maximum, while substitutes clamp at 12.9V. This 0.65V difference represents a 4.8% reduction and provides slightly faster transient suppression. For circuits designed around the original specification, this represents improved performance rather than degradation.

Q: Are all substitute parts available in the same package?

A: All substitutes use DO-214AA or SMB packaging, which are mechanically and electrically equivalent. Footprint compatibility is maintained across all listed parts.

Q: Which substitute offers the widest operating temperature range?

A: SZ1SMB7.5AT3G (Littelfuse Inc.) and the original SMBJ7.5 both operate from -65 to 150°C. Other substitutes operate from -50 to -55°C minimum, which is acceptable for most commercial and industrial applications.

Q: Is automotive qualification required for substitution?

A: Automotive qualification (AEC-Q101) is available with SZ1SMB7.5AT3G but is not required for general-purpose applications. Selection should be based on end-application requirements.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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