SMLJ30A-Q Equivalent & Substitute Parts

Part Overview

The SMLJ30A-Q is a unidirectional 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 30V reverse standoff voltage and 48.4V 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 to support procurement flexibility, supply chain continuity, and design standardization across manufacturing environments.

Substiute Parts

SMLJ30A-Q

Bourns Inc.In Stock: 830SMLJ30A-Q Datasheet

Current PartRFQ

SMDJE30AH

Eaton - Electronics DivisionIn Stock: 4123SMDJE30AH Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMLJ30A-Q are identified based on electrical and mechanical parameter equivalence. The critical substitution criteria are:

• Voltage - Reverse Standoff: 30V (Typ)
• Voltage - Clamping (Max) @ Ipp: 48.4V
• Current - Peak Pulse (10/1000µs): 62A
• Power - Peak Pulse: 3000W (3kW)
• Operating Temperature Range: -55°C ~ 150°C (TJ)
• Package / Case: DO-214AB, SMC (Surface Mount)
• Type: Unidirectional Zener TVS Diode
• Automotive Grade with AEC-Q101 Qualification

The SMDJE30AH from Eaton - Electronics Division meets all electrical performance requirements and package specifications, qualifying it as a direct functional equivalent for the SMLJ30A-Q in applications requiring transient voltage suppression at the specified voltage and current levels.

Parameter Comparison

Engineering Selection Recommendations

Both the SMLJ30A-Q and SMDJE30AH are active production components with automotive-grade qualification and AEC-Q101 certification. Selection between these parts should be based on:

• Supply availability and lead time requirements
• Procurement cost and volume pricing
• Existing supplier relationships and quality agreements
• PCB assembly process compatibility with either manufacturer's device specifications
• Inventory management and standardization objectives

The SMDJE30AH is electrically and mechanically equivalent to the SMLJ30A-Q across all critical performance parameters. Both components are suitable for automotive transient voltage suppression applications requiring 30V standoff protection with 62A peak pulse current handling capability.

Frequently Asked Questions (FAQ)

Q: Can SMDJE30AH be used as a direct replacement for SMLJ30A-Q in existing designs?

A: Yes. The SMDJE30AH meets identical electrical specifications (30V standoff, 48.4V clamping, 62A peak pulse current, 3kW peak power) and uses the same DO-214AB (SMC) surface mount package. Both components are AEC-Q101 qualified automotive-grade TVS diodes with matching operating temperature ranges (-55°C to 150°C).

Q: Are there any package or footprint differences between these parts?

A: No. Both the SMLJ30A-Q and SMDJE30AH use the DO-214AB (SMC) package with identical mechanical dimensions and pin configuration. PCB footprints are interchangeable.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution eligibility is determined by matching: reverse standoff voltage (30V), clamping voltage at peak pulse (48.4V), peak pulse current rating (62A), peak pulse power (3kW), and operating temperature range (-55°C to 150°C). All these parameters are identical between the SMLJ30A-Q and SMDJE30AH.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the SMLJ30A-Q and SMDJE30AH carry automotive-grade designation and AEC-Q101 qualification, meeting automotive industry reliability and quality standards.

Q: What is the moisture sensitivity level for these components?

A: Both parts have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.