SMLJ28A-Q Equivalent & Substitute Parts

Part Overview

The SMLJ28A-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 28V reverse standoff voltage and 45.4V maximum clamping voltage at peak pulse current. The part is actively produced, AEC-Q101 qualified for automotive applications, and RoHS3 compliant. Equivalent substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the same package category.

Substiute Parts

SMLJ28A-Q

Bourns Inc.In Stock: 1162SMLJ28A-Q Datasheet

Current PartRFQ

SMDJE28AH

Eaton - Electronics DivisionIn Stock: 3889SMDJE28AH Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMLJ28A-Q are qualified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff: 28V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 45.4V (exact match required)
• Current - Peak Pulse (10/1000µs): ≥66A (equal or greater)
• Power - Peak Pulse: 3000W (exact match required)
• Package / Case: DO-214AB (SMC) (exact match required)
• Operating Temperature Range: -55°C to 150°C (exact match required)
• Type: Zener, Unidirectional (exact match required)
• Mounting Type: Surface Mount (exact match required)

The SMDJE28AH from Eaton - Electronics Division meets all substitution criteria with matching voltage ratings, equivalent peak pulse current (66.1A), identical power dissipation, and compatible package specifications.

Parameter Comparison

Engineering Selection Recommendations

The SMDJE28AH is a direct functional equivalent to the SMLJ28A-Q. Both components are active production parts with identical automotive-grade qualification (AEC-Q101) and matching electrical specifications. The SMDJE28AH demonstrates marginally higher peak pulse current (66.1A versus 66A), which provides equivalent or superior performance within the same power dissipation envelope.

Selection between these parts should be based on:

• Availability and lead time requirements
• Supply chain qualification status within your organization
• Compliance documentation requirements (REACH status differs: SMLJ28A-Q is REACH Affected; SMDJE28AH is REACH Unaffected)
• Application-specific certifications or customer specifications

Both parts are suitable for identical circuit applications requiring 28V standoff protection with 45.4V clamping in surface mount DO-214AB packaging.

Frequently Asked Questions (FAQ)

Q: Can SMDJE28AH replace SMLJ28A-Q in existing designs?

A: Yes. The SMDJE28AH meets all electrical and mechanical substitution criteria. Both components share identical voltage ratings (28V standoff, 45.4V clamp), equivalent peak pulse current ratings, matching power dissipation (3kW), and compatible DO-214AB (SMC) packaging. Both are AEC-Q101 qualified automotive-grade parts with identical operating temperature ranges.

Q: Are there differences in package dimensions between these parts?

A: Both parts use the DO-214AB (SMC) package specification. No dimensional incompatibility exists for PCB layout or assembly processes.

Q: What is the significance of the REACH status difference?

A: SMLJ28A-Q is listed as REACH Affected, while SMDJE28AH is REACH Unaffected. This distinction relates to regulatory substance compliance documentation. Applications subject to REACH regulations may require specific documentation from the manufacturer. Verify compliance requirements with your regulatory or procurement department.

Q: Are both parts suitable for automotive applications?

A: Yes. Both SMLJ28A-Q and SMDJE28AH carry automotive-grade classification and AEC-Q101 qualification, confirming suitability for automotive transient protection circuits.

Q: What determines whether a part qualifies as a substitute?

A: Substitution is based on exact matching of critical electrical parameters (voltage ratings, clamping voltage, peak pulse current, power dissipation), mechanical compatibility (package type, mounting method), and operational specifications (temperature range, type classification). All substitute parts must maintain identical functional performance in the target application circuit.