SMLJ7.5A Equivalent & Substitute Parts

Part Overview

The SMLJ7.5A is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 7.5V reverse standoff voltage with a 12.9V maximum clamping voltage and peak pulse current rating of 232.6A. This part is actively produced and ROHS3 compliant, making it suitable for modern electronic designs requiring transient suppression in compact form factors.

Equivalent and substitute parts are identified based on matching critical electrical parameters: reverse standoff voltage, clamping voltage, peak pulse current capability, and package compatibility. Substitutes must maintain functional equivalence within the specified operating ranges.

Substiute Parts

SMLJ7.5A

Bourns Inc.In Stock: 870SMLJ7.5A Datasheet

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SMCJ7.5A

Taiwan Semiconductor CorporationIn Stock: 9312SMCJ7.5A Datasheet

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SMCJ7.5A

Taiwan Semiconductor CorporationIn Stock: 9312SMCJ7.5A Datasheet

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SMCJ8.5A-13-F

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

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts are grouped based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Reverse standoff voltage: 7.5V nominal
• Clamping voltage: 12.9V maximum
• Unidirectional Zener type
• Surface-mount package (DO-214AB / SMC)
• Operating temperature range: -55°C to 150°C

Substitution Logic:

The SMCJ7.5A (Taiwan Semiconductor Corporation) maintains identical electrical specifications for reverse standoff voltage (7.5V), breakdown voltage (8.33V minimum), and clamping voltage (12.9V maximum). Both devices are unidirectional Zener TVS diodes in DO-214AB/SMC packages with matching temperature ranges and ROHS3 compliance. The primary difference is peak pulse current capability: SMCJ7.5A is rated at 122A versus SMLJ7.5A at 232.6A. This substitute is applicable in applications where peak pulse current requirements do not exceed 122A.

The SMCJ8.5A-13-F (Diodes Incorporated) represents a higher voltage alternative with 8.5V reverse standoff and 14.4V clamping voltage. This part is suitable only for applications where the higher voltage rating is acceptable and peak pulse current does not exceed 104.2A.

Parameter Comparison

Engineering Selection Recommendations

SMCJ7.5A (Taiwan Semiconductor Corporation) is the primary substitute for SMLJ7.5A. Both parts maintain identical voltage specifications (7.5V reverse standoff, 12.9V clamping) and are ROHS3 compliant with active product status. Selection of SMCJ7.5A is appropriate when peak pulse current requirements are 122A or lower. This substitute provides equivalent protection performance within its current rating and maintains full compatibility with the DO-214AB/SMC package footprint.

SMCJ8.5A-13-F (Diodes Incorporated) is a higher-voltage alternative suitable only for circuit designs where the elevated reverse standoff voltage (8.5V) and clamping voltage (14.4V) are acceptable. This part is ROHS3 compliant and actively produced. Selection requires confirmation that the higher voltage rating does not compromise circuit protection objectives and that peak pulse current does not exceed 104.2A.

All three parts share identical operating temperature ranges (-55°C to 150°C), surface-mount packaging, and regulatory compliance status, ensuring thermal and environmental compatibility across substitution scenarios.

Frequently Asked Questions (FAQ)

Q: Can SMCJ7.5A directly replace SMLJ7.5A in all applications?

A: SMCJ7.5A is electrically equivalent for voltage specifications but has a lower peak pulse current rating (122A versus 232.6A). Direct substitution is valid only if the application's transient current does not exceed 122A. Verify circuit transient specifications before substitution.

Q: What is the primary difference between SMLJ7.5A and SMCJ7.5A?

A: Both devices have identical reverse standoff voltage (7.5V) and clamping voltage (12.9V). The key difference is peak pulse current capability: SMLJ7.5A handles 232.6A while SMCJ7.5A handles 122A. Peak pulse power dissipation differs accordingly (3kW versus 1.5kW).

Q: When should SMCJ8.5A-13-F be used instead of SMLJ7.5A?

A: SMCJ8.5A-13-F has higher voltage ratings (8.5V reverse standoff, 14.4V clamping) and lower peak pulse current (104.2A). Use this part only when circuit design requires higher voltage suppression thresholds and peak transient current does not exceed 104.2A.

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

A: Yes. All three parts use the DO-214AB/SMC surface-mount package, ensuring identical PCB footprint compatibility. No layout modifications are required for substitution.

Q: Do all substitute parts meet the same compliance standards?

A: Yes. SMCJ7.5A and SMCJ8.5A-13-F are both ROHS3 compliant with active product status, matching the compliance profile of SMLJ7.5A.

Q: What is the impact of lower peak pulse current in substitute parts?

A: Lower peak pulse current ratings indicate reduced transient energy handling capability. If the application experiences transient pulses exceeding the substitute part's rating, inadequate suppression or device failure may occur. Circuit transient analysis is required to confirm substitute suitability.