SMLJ8.5A Equivalent & Substitute Parts

Part Overview

The SMLJ8.5A is an active-status unidirectional transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component operates with an 8.5V reverse standoff voltage and provides 14.4V maximum clamping voltage at peak pulse current, delivering 3000W peak pulse power dissipation in a DO-214AB (SMC) package. Substitute parts are identified based on matching electrical specifications and mechanical compatibility to ensure direct functional equivalence in circuit protection applications.

Substiute Parts

SMLJ8.5A

Bourns Inc.In Stock: 15353SMLJ8.5A Datasheet

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SMDJ8.5A

Alpha & Omega Semiconductor Inc.In Stock: 12477SMDJ8.5A Datasheet

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1.5SMC10A

Taiwan Semiconductor CorporationIn Stock: 203021.5SMC10A Datasheet

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SM15T10A-E3/57T

Vishay General Semiconductor - Diodes DivisionIn Stock: 1703SM15T10A-E3/57T Datasheet

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SMCJ1.5KE10A-TP

Micro Commercial CoIn Stock: 3894SMCJ1.5KE10A-TP Datasheet

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SMCJ8.5A

EVVO SemiIn Stock: 9502SMCJ8.5A Datasheet

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SMCJ8.5A-13-F

Diodes IncorporatedIn Stock: 1063SMCJ8.5A-13-F Datasheet

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SMCJ8.5A-TP

Micro Commercial CoIn Stock: 3740SMCJ8.5A-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMLJ8.5A are categorized based on the following electrical and mechanical parameters:

Direct Electrical Equivalents match all critical protection characteristics: 8.5V reverse standoff voltage, 9.44V minimum breakdown voltage, 14.4V maximum clamping voltage, and 208.4A peak pulse current at 3000W power dissipation. These parts maintain identical voltage regulation performance and thermal handling capacity.

Functional Equivalents operate within the same voltage protection window (8.5V to 8.55V standoff) and clamping range (14.4V to 14.5V) but with reduced peak pulse current ratings (103A to 104.8A) and lower power dissipation (1500W). These parts provide equivalent overvoltage suppression for applications with lower transient energy requirements.

All substitute parts share the following mandatory compatibility criteria:

• Unidirectional channel configuration (1 channel)
• DO-214AB or SMC package format
• Surface-mount mounting type
• ROHS3 compliance
• Active product status
• Operating temperature range of -55°C minimum

Parameter Comparison

Engineering Selection Recommendations

Direct Replacement (Highest Compatibility): SMDJ8.5A from Alpha & Omega Semiconductor Inc. provides identical electrical specifications to the SMLJ8.5A, including 208.4A peak pulse current and 3000W power dissipation. Both components maintain active product status and ROHS3 compliance, ensuring seamless substitution without circuit redesign.

Functional Substitutes (Reduced Power Rating): SMCJ8.5A-TP, SMCJ8.5A-13-F, SMCJ8.5A, 1.5SMC10A, SM15T10A-E3/57T, and SMCJ1.5KE10A-TP operate within the same voltage protection window but with 1500W power dissipation and reduced peak pulse current (103A to 104.8A). These parts are suitable for applications where transient energy levels do not exceed 1500W. All maintain active status and ROHS3 compliance.

Temperature Considerations: SMCJ1.5KE10A-TP and SMCJ8.5A-TP extend the upper operating temperature to 175°C, compared to 150°C for the SMLJ8.5A. SM15T10A-E3/57T extends the lower operating temperature to -65°C. Selection should account for the specific thermal environment of the application.

Frequently Asked Questions (FAQ)

Q: Can SMDJ8.5A directly replace SMLJ8.5A without circuit modification?

A: Yes. SMDJ8.5A matches all electrical parameters of SMLJ8.5A: 8.5V reverse standoff voltage, 14.4V clamping voltage, 208.4A peak pulse current, and 3000W power dissipation. Both use DO-214AB (SMC) packaging and are ROHS3 compliant.

Q: What is the difference between the 3000W and 1500W rated parts?

A: The SMLJ8.5A and SMDJ8.5A dissipate 3000W peak pulse power with 208.4A peak pulse current. Functional equivalents (SMCJ8.5A, 1.5SMC10A, SM15T10A-E3/57T, SMCJ1.5KE10A-TP) dissipate 1500W with 103A to 104.8A peak pulse current. Selection depends on the transient energy level in the protected circuit.

Q: Are all substitute parts available in the same DO-214AB package?

A: Yes. All listed substitute parts use DO-214AB (SMC) surface-mount packaging, ensuring mechanical and footprint compatibility with the SMLJ8.5A.

Q: Do substitute parts maintain the same voltage regulation characteristics?

A: Direct equivalent SMDJ8.5A maintains identical voltage regulation (8.5V standoff, 14.4V clamping). Functional equivalents operate at 8.55V standoff and 14.5V clamping, representing a 0.05V to 0.1V variation within the same protection window.

Q: Which substitute offers the widest operating temperature range?

A: SMCJ1.5KE10A-TP and SMCJ8.5A-TP extend the upper temperature limit to 175°C (versus 150°C for SMLJ8.5A). SM15T10A-E3/57T extends the lower limit to -65°C (versus -55°C for SMLJ8.5A).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the environmental and regulatory status of the SMLJ8.5A.