SMLJ70A-TP Equivalent & Substitute Parts

Part Overview

The SMLJ70A-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 70V 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 690 units available in bulk packaging.

Identifying equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and accommodate different packaging or sourcing requirements while maintaining identical electrical performance and mechanical compatibility.

Substiute Parts

SMLJ70A-TP

Micro Commercial CoIn Stock: 751SMLJ70A-TP Datasheet

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SMDJ70A

Alpha & Omega Semiconductor Inc.In Stock: 1187SMDJ70A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMLJ70A-TP are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Voltage - Reverse Standoff: 70V (Typ)
• Voltage - Breakdown (Min): 77.8V
• Voltage - Clamping (Max) @ Ipp: 113V
• Current - Peak Pulse (10/1000µs): 26.6A
• Power - Peak Pulse: 3000W
• Package / Case: DO-214AB, SMC
• Mounting Type: Surface Mount
• Unidirectional Channels: 1
• Type: Zener

The SMDJ70A from Alpha & Omega Semiconductor Inc. meets all critical electrical parameters and shares the identical DO-214AB package footprint, making it a direct electrical and mechanical substitute. Packaging format differs (Tape & Reel versus Bulk), and maximum operating temperature differs by 25°C, but these do not affect functional substitution in general-purpose applications.

Parameter Comparison

Engineering Selection Recommendations

SMDJ70A Selection Criteria:

The SMDJ70A is a direct functional substitute for the SMLJ70A-TP based on identical electrical performance across all critical transient suppression parameters. Both parts are active products with REACH Unaffected status and EAR99 export classification, ensuring regulatory compliance and supply chain stability.

Considerations for Selection:

1. Operating Temperature: The SMDJ70A maximum junction temperature is 150°C compared to 175°C for the SMLJ70A-TP. Applications operating near or above 150°C require the SMLJ70A-TP.

2. Packaging Format: The SMDJ70A is supplied in Tape & Reel format, suitable for automated assembly processes. The SMLJ70A-TP is supplied in Bulk format, suitable for manual assembly or lower-volume applications.

3. Compliance: The SMDJ70A carries RoHS3 Compliant certification, providing additional environmental compliance documentation if required by procurement specifications.

4. Inventory Availability: The SMDJ70A has 1150 units in stock compared to 690 units for the SMLJ70A-TP, offering greater supply availability.

Both parts share identical DO-214AB package geometry and surface-mount footprint, requiring no PCB redesign for substitution.

Frequently Asked Questions (FAQ)

Q: Can the SMDJ70A replace the SMLJ70A-TP in all applications?

A: The SMDJ70A provides identical electrical performance for transient suppression. The primary limitation is maximum operating temperature: 150°C versus 175°C. Applications with junction temperatures below 150°C can use either part interchangeably. Applications requiring operation above 150°C must use the SMLJ70A-TP.

Q: Are the package footprints identical?

A: Yes. Both parts use the DO-214AB (SMC) surface-mount package with identical pin spacing, dimensions, and PCB footprint. No layout modifications are required for substitution.

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

A: Bulk packaging is loose component format suitable for manual assembly or small-quantity applications. Tape & Reel packaging is automated assembly format with components on carrier tape in reels, optimized for high-speed pick-and-place equipment. Electrical performance is identical; packaging format affects assembly process only.

Q: Do both parts meet the same regulatory standards?

A: Both parts are REACH Unaffected and classified as EAR99 for export control. The SMDJ70A additionally carries RoHS3 Compliant certification. Both meet the same electrical safety and environmental compliance requirements for general-purpose TVS applications.

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

A: Critical matching parameters are: 70V reverse standoff voltage, 77.8V minimum breakdown voltage, 113V maximum clamping voltage, 26.6A peak pulse current, and 3000W peak pulse power. The SMDJ70A matches all these specifications exactly.

Q: Can I mix SMLJ70A-TP and SMDJ70A parts in the same production run?

A: Yes, provided your application does not require operation above 150°C junction temperature. Both parts are electrically and mechanically interchangeable. However, using a single part number per production batch simplifies inventory management and traceability.