SMLJ78A-TP Equivalent & Substitute Parts

Part Overview

The SMLJ78A-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 78V 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 786 pieces available in bulk packaging. Substitute parts are identified to address packaging format requirements, inventory availability, or specific application constraints while maintaining electrical and mechanical compatibility.

Substiute Parts

SMLJ78A-TP

Micro Commercial CoIn Stock: 809SMLJ78A-TP Datasheet

Current PartRFQ

SMDJ78A

Alpha & Omega Semiconductor Inc.In Stock: 7179SMDJ78A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMLJ78A-TP is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Voltage - Reverse Standoff (Typ): 78V
• Voltage - Breakdown (Min): 86.7V
• Voltage - Clamping (Max) @ Ipp: 126V
• Power - Peak Pulse: 3000W (3kW)
• Unidirectional Channels: 1
• Type: Zener

Mechanical Compatibility Requirements:

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

The SMDJ78A qualifies as a direct electrical and mechanical substitute. Both components share identical voltage specifications (78V standoff, 86.7V breakdown minimum, 126V clamping maximum) and power rating (3000W peak pulse). Both are unidirectional Zener-type TVS diodes in DO-214AB surface-mount packages. The primary difference is packaging format (Tape & Reel versus Bulk) and peak pulse current specification (23.9A versus 22.8A), with the SMDJ78A providing marginally higher current capacity within the same power envelope.

Parameter Comparison

Engineering Selection Recommendations

SMLJ78A-TP Selection Criteria:

• Preferred for bulk procurement applications requiring standard packaging
• Suitable for applications with maximum operating temperature requirements up to 175°C (TJ)
• Recommended when Micro Commercial Co supply chain or qualification is specified

SMDJ78A Selection Criteria:

• Preferred for automated assembly processes utilizing tape and reel packaging
• Suitable for applications with maximum operating temperature requirements up to 150°C (TJ)
• Recommended when higher peak pulse current capacity (23.9A) provides design margin
• Offers higher inventory availability (7100 pieces in stock)
• RoHS3 Compliant certification available

Both parts maintain identical electrical performance for voltage clamping, breakdown, and standoff specifications. Both are REACH Unaffected and classified as EAR99 for export control purposes. Selection between these parts should be based on packaging format requirements, assembly process compatibility, and operating temperature range constraints specific to the application.

Frequently Asked Questions (FAQ)

Q: Can SMDJ78A directly replace SMLJ78A-TP in existing designs?

A: Yes, from an electrical and mechanical standpoint. Both components share identical voltage specifications (78V standoff, 86.7V breakdown, 126V clamping) and power rating (3000W). Both use the DO-214AB surface-mount package. The primary consideration is operating temperature range: SMLJ78A-TP operates to 175°C while SMDJ78A operates to 150°C. Verify your application's maximum junction temperature requirement before substitution.

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

A: SMLJ78A-TP is supplied in bulk packaging, suitable for manual handling and smaller production runs. SMDJ78A is supplied in Tape & Reel (TR) format, optimized for automated pick-and-place assembly equipment. Tape & Reel packaging typically offers better cost efficiency for high-volume manufacturing but requires compatible assembly equipment.

Q: Are there electrical performance differences between these parts?

A: Peak pulse current differs slightly: SMLJ78A-TP is rated at 22.8A while SMDJ78A is rated at 23.9A. Both maintain the same 3000W power dissipation and identical voltage specifications. The higher current rating of SMDJ78A provides additional design margin within the same power envelope.

Q: Do both parts meet the same compliance standards?

A: Both parts are REACH Unaffected and classified as EAR99 for export control. SMDJ78A carries RoHS3 Compliant certification. Both are currently in active production status.

Q: Which part should I select for new designs?

A: Selection depends on your specific requirements. If your application operates below 150°C junction temperature and uses automated assembly, SMDJ78A is suitable and offers higher inventory availability. If your application requires operation up to 175°C or uses manual assembly processes, SMLJ78A-TP is appropriate. Both are electrically equivalent for the specified voltage and power parameters.