SMCJ85A Equivalent & Substitute Parts

Part Overview

The SMCJ85A is a unidirectional transient voltage suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation, designed for general-purpose overvoltage protection in surface-mount applications. This component operates with an 85V reverse standoff voltage and provides 137V maximum clamping voltage at peak pulse current, with a peak pulse power rating of 1500W. The device is packaged in the DO-214AB (SMC) form factor and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary manufacturer part becomes unavailable, when alternative sourcing is required for supply chain optimization, or when application requirements necessitate different power dissipation or current handling capabilities within the same voltage class.

Substiute Parts

SMCJ85A

Taiwan Semiconductor CorporationIn Stock: 17974SMCJ85A Datasheet

Current PartRFQ

SMCJ85A-E3/57T

Vishay General Semiconductor - Diodes DivisionIn Stock: 1591SMCJ85A-E3/57T Datasheet

DirectRFQ

SMCJ85A-TP

Micro Commercial CoIn Stock: 3417SMCJ85A-TP Datasheet

DirectRFQ

5.0SMDJ85A

Taiwan Semiconductor CorporationIn Stock: 184825.0SMDJ85A Datasheet

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5.0SMDJ85A-T7

LittelfuseIn Stock: 18965.0SMDJ85A-T7 Datasheet

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SMCJ85A

MDDIn Stock: 17966SMCJ85A Datasheet

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SMCJ85A

MDDIn Stock: 17966SMCJ85A Datasheet

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SMCJ85A-13-F

Diodes IncorporatedIn Stock: 2706SMCJ85A-13-F Datasheet

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SMDJ85A

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

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SMLJ85A

Bourns Inc.In Stock: 9352SMLJ85A Datasheet

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SMLJ85A-TP

Micro Commercial CoIn Stock: 2264SMLJ85A-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMCJ85A are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents maintain identical electrical specifications: 85V reverse standoff voltage, 94.4V minimum breakdown voltage, 137V maximum clamping voltage, and 1500W peak pulse power rating. These parts are interchangeable without circuit modification and include SMCJ85A-E3/57T (Vishay), SMCJ85A-TP (Micro Commercial Co), SMCJ85A-13-F (Diodes Incorporated), and SMCJ85A (MDD).

Similar Substitutes share the same voltage class (85V standoff, 137V clamping) and DO-214AB/SMC package but differ in peak pulse current and power dissipation capabilities. These include higher-power variants (5.0SMDJ85A, 5.0SMDJ85A-T7, SMDJ85A, SMLJ85A, SMLJ85A-TP) rated for 3000W to 5000W peak pulse power. Similar substitutes are applicable when the circuit design permits higher current handling or when enhanced transient protection is required.

All substitute parts maintain the same unidirectional channel configuration, zener type classification, surface-mount packaging, and RoHS3 compliance status as the primary SMCJ85A device.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent Selection: SMCJ85A-E3/57T (Vishay), SMCJ85A-TP (Micro Commercial Co), SMCJ85A-13-F (Diodes Incorporated), and SMCJ85A (MDD) are direct functional equivalents with identical voltage specifications and 1500W power ratings. These parts are suitable for direct substitution in existing designs without circuit modification. All direct equivalents maintain RoHS3 compliance and MSL 1 rating. Selection among direct equivalents is based on manufacturer availability, supply chain preference, and inventory status.

Higher-Power Variant Selection: The 3000W-rated parts (SMDJ85A, SMLJ85A, SMLJ85A-TP) and 5000W-rated parts (5.0SMDJ85A, 5.0SMDJ85A-T7) are applicable when circuit design permits increased peak pulse current handling or when enhanced transient suppression margin is required. These variants maintain the same voltage class and package form factor. Selection of higher-power variants requires verification that the circuit design accommodates the increased current capacity without introducing unintended circuit behavior.

All substitute parts listed maintain RoHS3 compliance, unidirectional zener configuration, and DO-214AB/SMC surface-mount packaging consistent with the primary SMCJ85A specification.

Frequently Asked Questions (FAQ)

Q: Can SMCJ85A-E3/57T be used as a direct replacement for SMCJ85A?

A: Yes. SMCJ85A-E3/57T (Vishay) is a direct equivalent with identical voltage specifications (85V standoff, 137V clamping), peak pulse current (10.9A), and power rating (1500W). Both devices use the DO-214AB/SMC package and are RoHS3 compliant. No circuit modification is required.

Q: What is the difference between SMCJ85A and 5.0SMDJ85A?

A: Both devices share the same voltage class (85V standoff, 137V clamping) and DO-214AB/SMC package. The primary difference is power dissipation: SMCJ85A is rated for 1500W peak pulse power with 10.9A peak pulse current, while 5.0SMDJ85A is rated for 5000W peak pulse power with 36.5A peak pulse current. The 5.0SMDJ85A is suitable for applications requiring higher transient current handling within the same voltage protection window.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts listed use the DO-214AB/SMC package form factor, which maintains identical PCB footprint and land pattern compatibility. No PCB redesign is required when substituting between parts in this list.

Q: Which substitute part should be selected for maximum design margin?

A: Selection depends on circuit requirements. For identical electrical performance with alternative sourcing, select from direct equivalents (SMCJ85A-E3/57T, SMCJ85A-TP, SMCJ85A-13-F, SMCJ85A by MDD). For enhanced transient protection margin, select 3000W variants (SMDJ85A, SMLJ85A, SMLJ85A-TP) or 5000W variants (5.0SMDJ85A, 5.0SMDJ85A-T7). Circuit design verification is required to confirm that increased current capacity does not introduce unintended effects.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain RoHS3 compliance status consistent with the primary SMCJ85A device.

Q: What is the operating temperature range for substitute parts?

A: Operating temperature ranges vary by manufacturer. Direct equivalents operate within -55°C to 175°C (Micro Commercial Co SMCJ85A-TP), -55°C to 150°C (Vishay SMCJ85A-E3/57T, Diodes Incorporated SMCJ85A-13-F), or -50°C to 150°C (MDD SMCJ85A). Higher-power variants operate within -55°C to 175°C (Micro Commercial Co SMLJ85A-TP), -55°C to 150°C (Bourns SMLJ85A, Alpha & Omega SMDJ85A), or -65°C to 150°C (Littelfuse 5.0SMDJ85A-T7). Verify operating temperature requirements for the specific application before selection.

Q: Can SMLJ85A-TP be substituted for SMCJ85A in all applications?

A: SMLJ85A-TP maintains the same voltage specifications (85V standoff, 137V clamping) and DO-214AB/SMC package as SMCJ85A. However, SMLJ85A-TP is rated for 3000W peak pulse power with 20.8A peak pulse current, compared to SMCJ85A's 1500W and 10.9A. Substitution is valid when the circuit design accommodates the higher current capacity. Verify that increased current handling does not create unintended circuit behavior before implementation.