SMCJ40A-Q Equivalent & Substitute Parts

Part Overview

The SMCJ40A-Q is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for surface mount applications in the DO-214AB (SMC) package. This component provides transient overvoltage protection with a 40V reverse standoff voltage and 64.5V maximum clamping voltage at peak pulse current. The part is actively produced, AEC-Q101 qualified for automotive applications, and RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the same package category.

Substiute Parts

SMCJ40A-Q

Bourns Inc.In Stock: 1142SMCJ40A-Q Datasheet

Current PartRFQ

SMCJE40AH

Eaton - Electronics DivisionIn Stock: 3438SMCJE40AH Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMCJ40A-Q are qualified based on the following critical parameters:

• Voltage - Reverse Standoff (Typ): 40V
• Voltage - Clamping (Max) @ Ipp: 64.5V
• Current - Peak Pulse (10/1000µs): 23.3A
• Power - Peak Pulse: 1500W
• Package / Case: DO-214AB, SMC (surface mount)
• Unidirectional Channels: 1
• Type: Zener
• Operating Temperature Range: -55°C to 150°C (TJ)
• Automotive Grade and AEC-Q101 Qualification

The SMCJE40AH from Eaton - Electronics Division meets all electrical and mechanical requirements for direct substitution. Both parts share identical voltage ratings, peak pulse current specifications, power dissipation capability, and package configuration. Both are automotive-grade components with AEC-Q101 qualification and operate across the same temperature range.

Parameter Comparison

Engineering Selection Recommendations

The SMCJE40AH is a direct electrical and mechanical equivalent to the SMCJ40A-Q. Both components are active products with automotive-grade classification and AEC-Q101 qualification, ensuring compliance with automotive reliability standards. Selection between these parts may be based on availability, supply chain considerations, or procurement preferences, as all critical electrical parameters and package specifications are identical. Both parts are RoHS compliant and suitable for the same circuit applications requiring 40V standoff protection with 23.3A peak pulse current handling capability.

Frequently Asked Questions (FAQ)

Q: Can SMCJE40AH replace SMCJ40A-Q in existing designs?

A: Yes. The SMCJE40AH is electrically and mechanically equivalent. Both parts have identical voltage ratings (40V standoff, 64.5V clamping), peak pulse current (23.3A), power dissipation (1500W), operating temperature range (-55 to 150°C), and DO-214AB (SMC) package configuration. Both are automotive-grade with AEC-Q101 qualification.

Q: Are there any package compatibility concerns?

A: No. Both the SMCJ40A-Q and SMCJE40AH use the DO-214AB (SMC) surface mount package. Pin configuration and footprint are identical, allowing direct PCB substitution without layout modifications.

Q: What are the key parameters that determine substitution eligibility?

A: Substitution eligibility is determined by matching: Voltage - Reverse Standoff (40V), Voltage - Clamping (64.5V), Current - Peak Pulse (23.3A), Power - Peak Pulse (1500W), Operating Temperature Range (-55 to 150°C), Package Type (DO-214AB, SMC), and Unidirectional Channel Configuration (1 channel). Automotive Grade and AEC-Q101 Qualification must also be maintained.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both SMCJ40A-Q and SMCJE40AH are automotive-grade components with AEC-Q101 qualification, meeting automotive reliability and quality standards.

Q: Are there differences in compliance or regulatory status?

A: Both parts are RoHS3 compliant and carry EAR99 ECCN classification. The SMCJ40A-Q is REACH Affected, while the SMCJE40AH is REACH Unaffected. Verify REACH compliance requirements for your specific application and region before final selection.