SMLJ120A-TP Equivalent & Substitute Parts

Part Overview

The SMLJ120A-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 with a 120V 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 1003 units available in bulk packaging.

Identifying equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and accommodate different packaging requirements or manufacturer availability across production cycles.

Substiute Parts

SMLJ120A-TP

Micro Commercial CoIn Stock: 1023SMLJ120A-TP Datasheet

Current PartRFQ

SMDJ120A

Alpha & Omega Semiconductor Inc.In Stock: 1266SMDJ120A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMLJ120A-TP are identified based on strict electrical and mechanical parameter matching within the TVS diode category. The substitution logic is based on the following critical parameters:

Electrical Equivalence Criteria:

• Voltage - Reverse Standoff (Typ): 120V
• Voltage - Breakdown (Min): 133V
• Voltage - Clamping (Max) @ Ipp: 193V
• Current - Peak Pulse (10/1000µs): 15.6A
• Power - Peak Pulse: 3000W
• Unidirectional Channels: 1
• Type: Zener

Mechanical Equivalence Criteria:

• Mounting Type: Surface Mount
• Package / Case: DO-214AB, SMC

Parts meeting all electrical parameters and mechanical specifications are classified as direct substitutes. Packaging format differences (Bulk versus Tape & Reel) do not affect electrical or mechanical compatibility and are considered acceptable variations for component selection purposes.

Parameter Comparison

*Note: The SMDJ120A operates to 150°C maximum junction temperature, compared to 175°C for the SMLJ120A-TP. Applications requiring operation above 150°C require the main part.

Engineering Selection Recommendations

SMDJ120A Substitution Eligibility:

The SMDJ120A is a valid substitute for the SMLJ120A-TP in applications where the operating temperature requirement does not exceed 150°C junction temperature. Both parts are active products with identical electrical performance across all critical TVS parameters: 120V standoff voltage, 193V clamping voltage, 15.6A peak pulse current, and 3000W peak pulse power dissipation.

Both parts carry REACH Unaffected status and EAR99 ECCN classification, indicating equivalent regulatory compliance. The primary difference is packaging format: SMLJ120A-TP is supplied in Bulk, while SMDJ120A is supplied in Tape & Reel format. This packaging difference does not affect electrical or mechanical compatibility.

Selection Criteria:

• Select SMLJ120A-TP when bulk packaging is required or when operating temperatures may reach 175°C
• Select SMDJ120A when tape & reel packaging is preferred and operating temperatures remain below 150°C
• Both parts are suitable for general-purpose interface protection applications

Frequently Asked Questions (FAQ)

Q: Can SMDJ120A replace SMLJ120A-TP in all applications?

A: SMDJ120A is electrically and mechanically equivalent to SMLJ120A-TP for all applications where the maximum junction temperature does not exceed 150°C. The SMLJ120A-TP supports operation to 175°C. Verify your application's thermal requirements before substitution.

Q: What is the difference between Bulk and Tape & Reel packaging?

A: Bulk packaging supplies loose components, while Tape & Reel packaging provides components on continuous tape for automated assembly. Both formats contain identical components with the same electrical specifications. Selection depends on manufacturing process requirements and inventory management practices.

Q: Are the electrical parameters identical between these parts?

A: Yes. Both SMLJ120A-TP and SMDJ120A share identical specifications for reverse standoff voltage (120V), breakdown voltage (133V minimum), clamping voltage (193V maximum), peak pulse current (15.6A), and peak pulse power (3000W). Both are unidirectional Zener-type TVS diodes in DO-214AB packages.

Q: Do these parts have the same regulatory compliance?

A: Yes. Both parts are REACH Unaffected and classified as EAR99 for export control purposes. Both are active products from their respective manufacturers.

Q: What is the significance of the 25°C temperature difference?

A: The SMLJ120A-TP operates to 175°C junction temperature, while SMDJ120A operates to 150°C. For applications with high ambient temperatures or high power dissipation scenarios, verify that the selected part's maximum temperature rating accommodates your thermal design. The SMLJ120A-TP provides additional thermal margin in demanding environments.

Q: Can I mix these parts in the same production run?

A: Both parts are mechanically and electrically equivalent and can be used interchangeably within the temperature constraints noted. However, verify your quality assurance and traceability requirements, as they are from different manufacturers.