SMLJ51CA-TP Equivalent & Substitute Parts

Part Overview

The SMLJ51CA-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 features a 51V reverse standoff voltage with an 82.4V maximum clamping voltage and 36.4A peak pulse current capability in a DO-214AB (SMC) package. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating. Substitute parts are identified when electrical parameters and mechanical specifications align within acceptable tolerances for the intended application.

Substiute Parts

SMLJ51CA-TP

Micro Commercial CoIn Stock: 1044SMLJ51CA-TP Datasheet

Current PartRFQ

SMDJ51CA

Alpha & Omega Semiconductor Inc.In Stock: 30124SMDJ51CA Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMLJ51CA-TP are qualified based on the following critical parameters:

• Voltage - Reverse Standoff: 51V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 82.4V (exact match required)
• Current - Peak Pulse: ≥36.4A (equal or greater acceptable)
• Power - Peak Pulse: 3000W (exact match required)
• Package / Case: DO-214AB (SMC) (exact match required)
• Mounting Type: Surface Mount (exact match required)
• RoHS Status: ROHS3 Compliant (compliance required)

The SMDJ51CA from Alpha & Omega Semiconductor Inc. qualifies as a direct substitute based on matching all critical electrical and mechanical parameters within acceptable engineering tolerances.

Parameter Comparison

Engineering Selection Recommendations

The SMDJ51CA is a qualified substitute for the SMLJ51CA-TP based on electrical parameter equivalence and identical package specifications. Both components are active products with ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for current and future applications.

The primary consideration is the operating temperature range: the SMLJ51CA-TP supports -55°C to 175°C, while the SMDJ51CA supports -55°C to 150°C. Selection between these parts depends on whether the application requires operation above 150°C. For applications within the -55°C to 150°C range, both parts are functionally equivalent. Peak pulse current performance is equivalent, with the SMDJ51CA delivering 36.5A compared to 36.4A for the SMLJ51CA-TP, representing negligible practical difference.

Frequently Asked Questions (FAQ)

Q: What determines if a part can substitute for the SMLJ51CA-TP?

A: Substitutes must match the reverse standoff voltage (51V), clamping voltage (82.4V), peak pulse power (3000W), and package type (DO-214AB SMC). Peak pulse current must be equal to or greater than 36.4A. RoHS3 compliance is required.

Q: Can the SMDJ51CA be used in all applications where SMLJ51CA-TP is specified?

A: The SMDJ51CA is suitable for applications operating within -55°C to 150°C. If your application requires operation above 150°C, the SMLJ51CA-TP is the appropriate choice due to its extended temperature range to 175°C.

Q: Are the DO-214AB packages identical between manufacturers?

A: Yes. Both the SMLJ51CA-TP and SMDJ51CA use the DO-214AB (SMC) package, ensuring mechanical and electrical compatibility in PCB layouts and reflow processes.

Q: What is the significance of the 0.1A difference in peak pulse current?

A: The SMDJ51CA delivers 36.5A versus 36.4A for the SMLJ51CA-TP. This 0.1A difference is within normal manufacturing tolerance and does not affect functional performance in typical applications.

Q: Are both parts compliant with current regulatory requirements?

A: Yes. Both the SMLJ51CA-TP and SMDJ51CA are ROHS3 compliant and REACH unaffected, meeting current environmental and safety regulations.