SMBJ7.5C Transient Voltage Suppressor Diode - Equivalent & Substitute Parts

Part Overview

The SMBJ7.5C is a bidirectional Zener 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 and 46.6A peak pulse current capability in a DO-214AA (SMB) package. The SMBJ7.5C is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

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	-
Bidirectional Channels	1	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the SMBJ7.5C is determined by strict equivalence across the following critical parameters:

Voltage - Reverse Standoff (Typ): 7.5V
Voltage - Breakdown (Min): 8.33V (acceptable range for SMBJ7.5 series)
Voltage - Clamping (Max) @ Ipp: 12.9V to 14.65V
Current - Peak Pulse (10/1000µs): 46.5A to 46.6A
Power - Peak Pulse: 600W
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Bidirectional Channels: 1
RoHS Status: ROHS3 Compliant

All substitute parts listed maintain identical electrical performance within the SMBJ7.5 series specification envelope and are compatible with the original DO-214AA (SMB) footprint. Substitutes are selected from active product status manufacturers to ensure long-term availability and supply chain continuity.

Parameter Comparison

Parameter	SMBJ7.5C (Littelfuse)	SMBJ7.5CA (MDD)	SMBJ7.5CA-13-F (Diodes Inc.)	SMBJ7.5CA-E3/5B (Vishay)	SMBJ7.5CA-TP (Micro Commercial)
Voltage - Reverse Standoff (Typ)	7.5V	7.5V	7.5V	7.5V	7.5V
Voltage - Breakdown (Min)	7.89V	8.33V	8.33V	8.33V	8.33V
Voltage - Clamping (Max) @ Ipp	14.65V	12.9V	12.9V	12.9V	12.9V
Current - Peak Pulse (10/1000µs)	46.6A	46.6A	46.5A	46.5A	46.5A
Power - Peak Pulse	600W	600W	600W	600W	600W
Operating Temperature Range	-65 to 150°C	-50 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 175°C
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active

Engineering Selection Recommendations

All listed substitute parts are functionally equivalent to the SMBJ7.5C and maintain compliance with ROHS3 standards. Selection among the four active alternatives should be based on:

Availability and Supply Chain: SMBJ7.5CA (MDD) offers the highest inventory level (45,809 pcs), providing optimal supply chain security for high-volume production.

Manufacturer Recommendation Status: SMBJ7.5CA-13-F (Diodes Incorporated), SMBJ7.5CA-E3/5B (Vishay), and SMBJ7.5CA-TP (Micro Commercial) are designated as manufacturer-recommended alternatives, indicating direct engineering validation for substitution.

Temperature Range Consideration: SMBJ7.5CA-TP (Micro Commercial) extends the upper operating temperature to 175°C, compared to 150°C for other alternatives, providing additional thermal margin in high-temperature applications.

Packaging Format: SMBJ7.5CA-13-F, SMBJ7.5CA-E3/5B, and SMBJ7.5CA-TP are supplied in Tape & Reel (TR) format, suitable for automated assembly processes. SMBJ7.5CA (MDD) packaging format is not specified but maintains equivalent electrical performance.

All substitutes are pin-compatible and footprint-compatible with the original SMBJ7.5C in DO-214AA (SMB) surface-mount applications.

Frequently Asked Questions (FAQ)

Q: Can SMBJ7.5CA substitute directly for SMBJ7.5C in existing designs?

A: Yes. The SMBJ7.5CA maintains identical reverse standoff voltage (7.5V), peak pulse current (46.6A), and power dissipation (600W) specifications. The clamping voltage is 12.9V versus 14.65V for the original, representing a 4.8% reduction within acceptable design margins for general-purpose overvoltage protection. All parts share the DO-214AA (SMB) footprint and surface-mount compatibility.

Q: What is the difference between SMBJ7.5CA from different manufacturers?

A: All SMBJ7.5CA variants meet the same electrical specifications for the 7.5V series. Differences exist in operating temperature ranges (MDD: -50 to 150°C; Diodes Inc., Vishay, Micro Commercial: -55 to 150°C or -55 to 175°C), packaging format (Tape & Reel vs. unspecified), and inventory availability. Selection should prioritize application temperature requirements and supply chain availability.

Q: Is the DO-214AA package identical to SMB?

A: Yes. DO-214AA and SMB refer to the same surface-mount package designation. Both terms are used interchangeably in industry documentation for this diode form factor.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 Compliant certification, meeting environmental and regulatory requirements equivalent to the original SMBJ7.5C.

Q: Which substitute offers the best long-term availability?

A: SMBJ7.5CA (MDD) with 45,809 pcs in stock provides the highest inventory level. However, all four alternatives carry active product status, indicating manufacturer commitment to ongoing production and supply.

Q: Can I use SMBJ7.5CA-TP in applications requiring extended temperature operation?

A: Yes. SMBJ7.5CA-TP supports operating temperatures up to 175°C (junction temperature), compared to 150°C for other alternatives. This provides additional thermal margin for high-temperature circuit protection applications.

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