SMLJ33CA-Q Equivalent & Substitute Parts

Part Overview

The SMLJ33CA-Q is a bidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for surface mount applications in DO-214AB (SMC) package. This component provides transient overvoltage protection with a 33V reverse standoff voltage and 53.3V maximum clamping voltage. The part is actively produced, AEC-Q101 qualified for automotive applications, and RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter range.

Substiute Parts

SMLJ33CA-Q

Bourns Inc.In Stock: 3641SMLJ33CA-Q Datasheet

Current PartRFQ

SMDJE33CAH

Eaton - Electronics DivisionIn Stock: 3079SMDJE33CAH Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMLJ33CA-Q is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff: 33V (nominal)
• Voltage - Clamping (Max) @ Ipp: 53.3V
• Current - Peak Pulse (10/1000µs): 56.2A minimum
• Power - Peak Pulse: 3000W
• Package / Case: DO-214AB, SMC (surface mount)
• Operating Temperature Range: -55°C to 150°C
• Bidirectional Channels: 1
• Type: Zener
• Automotive Grade and AEC-Q101 qualification

The SMDJE33CAH from Eaton - Electronics Division meets all electrical and mechanical requirements within the specified tolerance range and is therefore classified as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

Both the SMLJ33CA-Q and SMDJE33CAH are active production components with automotive-grade qualification and AEC-Q101 certification. Selection between these parts is based on availability and supply chain requirements rather than electrical or mechanical differentiation. The SMLJ33CA-Q maintains 3612 units in stock, while the SMDJE33CAH has 2990 units available. Both components are RoHS3 compliant and operate within identical electrical and thermal specifications. The SMDJE33CAH is additionally noted for telecom applications, though this does not affect its suitability for the primary automotive use case. PCB layout and thermal management considerations remain unchanged between substitutes due to identical package geometry and power dissipation characteristics.

Frequently Asked Questions (FAQ)

Q: Can SMDJE33CAH replace SMLJ33CA-Q in existing designs?

A: Yes. The SMDJE33CAH is electrically and mechanically equivalent. Both components share identical voltage ratings (33V standoff, 53.3V clamping), current handling (56.2A/56.3A peak pulse), power dissipation (3000W), package geometry (DO-214AB, SMC), and operating temperature range (-55°C to 150°C). Both are AEC-Q101 qualified automotive-grade components.

Q: Are there package compatibility concerns?

A: No. Both parts use the DO-214AB (SMC) surface mount package. PCB footprints, solder pad layouts, and thermal characteristics are identical. No design modifications are required.

Q: What is the difference in peak pulse current between the two parts?

A: The SMLJ33CA-Q specifies 56.2A peak pulse current, while the SMDJE33CAH specifies 56.3A. This 0.1A difference is within normal manufacturing tolerance and does not affect circuit performance or thermal management.

Q: Do both parts meet automotive qualification requirements?

A: Yes. Both the SMLJ33CA-Q and SMDJE33CAH are automotive-grade components with AEC-Q101 qualification, suitable for automotive transient voltage suppression applications.

Q: Is there a difference in RoHS compliance?

A: The SMLJ33CA-Q is RoHS3 compliant. The SMDJE33CAH is listed as REACH Unaffected. Both components meet current environmental compliance standards for their respective supply chains.