SMLJ85A-TP Equivalent & Substitute Parts

Part Overview

The SMLJ85A-TP is a unidirectional transient voltage suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This component operates with an 85V reverse standoff voltage and provides 3000W peak pulse power dissipation in a compact DO-214AB (SMC) package. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1), making it suitable for industrial and commercial electronic designs requiring transient voltage suppression.

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility is required while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Substiute Parts

SMLJ85A-TP

Micro Commercial CoIn Stock: 2264SMLJ85A-TP Datasheet

Current PartRFQ

SMDJ85A

Alpha & Omega Semiconductor Inc.In Stock: 4587SMDJ85A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMLJ85A-TP is determined by strict alignment of the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - Reverse Standoff (Typ): 85V (exact match required)
• Voltage - Breakdown (Min): 94.4V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 137V (exact match required)
• Power - Peak Pulse: 3000W (exact match required)
• Unidirectional Channels: 1 (exact match required)
• Type: Zener (exact match required)

Mechanical Compatibility Criteria:

• Package / Case: DO-214AB, SMC (exact match required)
• Mounting Type: Surface Mount (exact match required)

Compliance Requirements:

• RoHS Status: ROHS3 Compliant (minimum requirement)
• Product Status: Active (current production required)

The SMDJ85A from Alpha & Omega Semiconductor Inc. qualifies as a direct substitute based on matching all critical electrical parameters, identical package configuration, and equivalent compliance certifications. Minor variations in peak pulse current (21.9A vs. 20.8A) and maximum operating temperature (-55°C to 150°C vs. -55°C to 175°C) do not disqualify substitution, as the substitute part exceeds the minimum electrical performance requirements and maintains the same functional voltage suppression characteristics.

Parameter Comparison

Engineering Selection Recommendations

SMLJ85A-TP (Primary Selection): The SMLJ85A-TP remains the preferred component when available. It is manufactured by Micro Commercial Co, maintains active production status, and provides the specified operating temperature range of -55°C to 175°C. This part is ROHS3 compliant with unlimited moisture sensitivity (MSL 1), suitable for standard industrial applications without environmental restrictions.

SMDJ85A (Substitute Selection): The SMDJ85A from Alpha & Omega Semiconductor Inc. is a qualified substitute when SMLJ85A-TP availability is constrained. This part maintains identical electrical performance for voltage suppression (85V standoff, 137V clamping) and power dissipation (3000W peak pulse). The substitute delivers higher peak pulse current capability (21.9A vs. 20.8A), providing additional margin in transient protection. The operating temperature range is -55°C to 150°C, which is narrower than the primary part but remains suitable for most commercial and industrial applications operating within standard temperature limits. Both parts are ROHS3 compliant and carry equivalent regulatory status (REACH Unaffected, EAR99 classification).

Selection between these parts should be based on availability, supply chain lead times, and application-specific temperature requirements. No design modifications are required when substituting between these components.

Frequently Asked Questions (FAQ)

Q: Can SMDJ85A be used as a direct replacement for SMLJ85A-TP in all applications?

A: Yes, SMDJ85A is a direct electrical and mechanical substitute for SMLJ85A-TP in applications where the operating temperature does not exceed 150°C. Both parts provide identical voltage suppression characteristics (85V standoff, 137V clamping) and power dissipation (3000W). The substitute part actually exceeds the peak pulse current specification (21.9A vs. 20.8A), providing enhanced transient protection margin. No circuit modifications or design changes are required.

Q: What is the difference in operating temperature range between these parts?

A: SMLJ85A-TP operates from -55°C to 175°C (junction temperature), while SMDJ85A operates from -55°C to 150°C. The SMDJ85A has a 25°C narrower upper temperature limit. For applications with maximum operating temperatures at or below 150°C, this difference is not a limiting factor. Applications requiring operation above 150°C should use the SMLJ85A-TP.

Q: Are both parts available in the same package?

A: Yes. Both SMLJ85A-TP and SMDJ85A use the DO-214AB (SMC) surface-mount package. They are mechanically and electrically compatible for PCB assembly without any footprint or layout modifications.

Q: What are the key electrical parameters that must match for substitution?

A: The critical parameters that must match are: Voltage - Reverse Standoff (85V), Voltage - Breakdown (94.4V minimum), Voltage - Clamping (137V maximum), Power - Peak Pulse (3000W), and package type (DO-214AB, SMC). Both parts meet these requirements exactly.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both SMLJ85A-TP and SMDJ85A are ROHS3 compliant, REACH Unaffected, and classified as EAR99 for export control purposes. They carry equivalent regulatory status and can be used interchangeably from a compliance perspective.

Q: What is the peak pulse current difference, and does it affect circuit design?

A: SMDJ85A provides 21.9A peak pulse current compared to 20.8A for SMLJ85A-TP. This 1.1A difference represents approximately 5% higher current capability in the substitute part. This difference does not require any circuit design changes and actually provides additional transient protection margin.