SMLJ85CA-TP Equivalent & Substitute Parts

Part Overview

The SMLJ85CA-TP is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose interface protection applications. This surface-mount component operates across a temperature range of -55°C to 175°C and is currently in active production status. The part is supplied in bulk packaging with 854 units in stock.

TVS diodes are essential components in electronic circuits requiring transient overvoltage protection. Identifying equivalent and substitute parts is necessary when managing supply chain continuity, optimizing inventory costs, or accommodating packaging format requirements across different manufacturing stages.

Substiute Parts

SMLJ85CA-TP

Micro Commercial CoIn Stock: 958SMLJ85CA-TP Datasheet

Current PartRFQ

SMDJ85CA

Alpha & Omega Semiconductor Inc.In Stock: 1534SMDJ85CA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMLJ85CA-TP is determined by strict alignment of the following critical parameters:

Voltage Specifications: Reverse standoff voltage of 85V (typical), breakdown voltage minimum of 94.4V, and clamping voltage maximum of 137V at peak pulse current must be maintained.

Current Rating: Peak pulse current of 20.8A at 10/1000µs pulse duration defines the transient suppression capability.

Power Dissipation: Peak pulse power rating of 3000W (3kW) establishes the thermal handling capacity.

Physical Form Factor: Surface-mount configuration with DO-214AB (SMC) package ensures mechanical and electrical compatibility with existing PCB layouts.

Channel Configuration: Single bidirectional channel (1CH) architecture must be preserved.

Device Type: Zener-type TVS diode classification must remain consistent.

Substitute parts must satisfy all these parameters within the specified tolerances. Packaging format (bulk versus tape & reel) and operating temperature range variations are secondary considerations that do not affect functional substitution capability.

Parameter Comparison

Engineering Selection Recommendations

SMDJ85CA as Direct Substitute:

The SMDJ85CA meets all critical electrical parameters required for functional substitution of the SMLJ85CA-TP. Voltage specifications (standoff, breakdown, and clamping) are identical. The peak pulse current of 21.9A exceeds the main part requirement of 20.8A, providing additional margin for transient suppression. Power dissipation capacity remains at 3000W.

Both parts maintain active product status and carry identical REACH and ECCN compliance classifications (REACH Unaffected, EAR99). The SMDJ85CA is RoHS3 compliant, meeting current environmental standards.

Packaging Consideration:

The primary difference is packaging format: SMLJ85CA-TP is supplied in bulk, while SMDJ85CA is supplied in tape & reel format. This distinction affects procurement and assembly processes but does not impact electrical performance or mechanical compatibility on the PCB.

Temperature Range Consideration:

The SMDJ85CA operates to a maximum junction temperature of 150°C, compared to 175°C for the SMLJ85CA-TP. For applications operating within the -55°C to 150°C range, this substitution is fully qualified. Applications requiring sustained operation above 150°C junction temperature must retain the original SMLJ85CA-TP specification.

Inventory Availability:

SMDJ85CA stock availability (1440 units) exceeds SMLJ85CA-TP availability (854 units), supporting supply chain flexibility.

Frequently Asked Questions (FAQ)

Q: Can SMDJ85CA replace SMLJ85CA-TP in all applications?

A: SMDJ85CA is electrically equivalent for applications where the maximum junction temperature does not exceed 150°C. Both parts share identical voltage specifications (85V standoff, 94.4V breakdown minimum, 137V clamping maximum) and power rating (3000W). The SMDJ85CA's peak pulse current of 21.9A exceeds the 20.8A requirement, providing additional transient suppression capability. For applications requiring operation above 150°C junction temperature, the original SMLJ85CA-TP must be specified.

Q: What is the difference between bulk and tape & reel packaging?

A: Bulk packaging supplies components loose in a container, suitable for manual assembly or small-volume production. Tape & reel packaging supplies components on continuous carrier tape wound on reels, optimized for automated pick-and-place assembly equipment. Both formats contain identical components; the difference is logistical and assembly-process related. Electrical and mechanical performance are unaffected by packaging format.

Q: Are there compliance differences between these parts?

A: Both SMLJ85CA-TP and SMDJ85CA carry identical REACH and ECCN classifications (REACH Unaffected, EAR99). The SMDJ85CA additionally carries RoHS3 compliance certification. Both parts are active products from established manufacturers. No compliance barriers exist to substitution.

Q: How do the peak pulse current ratings affect substitution?

A: The SMDJ85CA peak pulse current of 21.9A exceeds the SMLJ85CA-TP specification of 20.8A. Higher peak pulse current capability indicates enhanced transient suppression performance. This difference does not prevent substitution; rather, it provides additional design margin. The clamping voltage (137V maximum) and power dissipation (3000W) remain identical, ensuring circuit protection characteristics are preserved.

Q: What should be verified before substituting these parts in production?

A: Verify that the application's maximum junction temperature requirement does not exceed 150°C. Confirm that the PCB assembly process is compatible with tape & reel packaging if substituting SMDJ85CA. Validate that procurement and inventory systems are updated to reflect the new part number. No electrical re-qualification is required due to parameter equivalence.