SMDJ15 Equivalent & Substitute Parts

Part Overview

The SMDJ15 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. Specified with a 15V reverse standoff voltage, 25.62V maximum clamping voltage, and 123A peak pulse current in a DO-214AB (SMC) package, this component is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production and field replacements.

Substiute Parts

SMDJ15

Littelfuse Inc.In Stock: 691SMDJ15 Datasheet

Current PartRFQ

SMDJ15A

Alpha & Omega Semiconductor Inc.In Stock: 15358SMDJ15A Datasheet

DirectRFQ

SMCJ15A

EVVO SemiIn Stock: 359272SMCJ15A Datasheet

MFR RecommendedRFQ

SMCJ15A

EVVO SemiIn Stock: 359272SMCJ15A Datasheet

MFR RecommendedRFQ

SMCJ15A-TP

Micro Commercial CoIn Stock: 3883SMCJ15A-TP Datasheet

MFR RecommendedRFQ

SMCJ15AE3/TR13

Microchip TechnologyIn Stock: 1115SMCJ15AE3/TR13 Datasheet

MFR RecommendedRFQ

SMLJ15A

Bourns Inc.In Stock: 15453SMLJ15A Datasheet

MFR RecommendedRFQ

SMLJ15A-TP

Micro Commercial CoIn Stock: 28980SMLJ15A-TP Datasheet

MFR RecommendedRFQ

TV15C150J-G

Comchip TechnologyIn Stock: 1206TV15C150J-G Datasheet

MFR RecommendedRFQ

TV30C150J-G

Comchip TechnologyIn Stock: 1153TV30C150J-G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMDJ15 is determined by strict electrical and mechanical compatibility across the following parameters:

Critical Matching Parameters:

• Reverse standoff voltage: 15V (typ)
• Breakdown voltage minimum: 15.84V or higher
• Clamping voltage maximum: 25.62V or lower
• Peak pulse current: 123A or higher
• Peak pulse power: 3000W or higher
• Unidirectional channels: 1
• Mounting type: Surface Mount
• Package: DO-214AB (SMC) or equivalent footprint
• Operating temperature range: -65°C to 150°C minimum

Substitute parts are grouped into two categories based on electrical performance alignment:

Category A - Full Electrical Equivalents (123A Peak Pulse Current, 3000W Power): Parts matching all critical electrical parameters with identical or superior performance specifications.

Category B - Reduced Performance Substitutes (61.5A Peak Pulse Current, 600W-1500W Power): Parts with lower peak pulse current and power ratings. These are suitable only where circuit design permits reduced transient energy absorption.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Full Electrical Equivalence):

SMDJ15A, SMLJ15A, SMLJ15A-TP, and TV30C150J-G are suitable direct replacements. All maintain the 15V reverse standoff voltage, 123A peak pulse current, and 3000W power dissipation. SMDJ15A and SMLJ15A are active products with ROHS3 compliance. SMLJ15A-TP extends the upper operating temperature to 175°C. TV30C150J-G provides equivalent electrical performance with active product status and ROHS3 compliance.

For Reduced Performance Applications:

SMCJ15AE3/TR13, SMCJ15A-TP, and TV15C150J-G operate at 61.5A peak pulse current and 1500W power dissipation. These parts are suitable only where circuit design accommodates lower transient energy absorption. All three maintain active product status and ROHS3 compliance. SMCJ15A-TP and SMCJ15AE3/TR13 support extended temperature ranges (-55°C to 175°C and -65°C to 150°C respectively).

Compliance Considerations:

All substitute parts are ROHS3 compliant. SMLJ15A carries REACH Affected status; all other substitutes are REACH Unaffected or REACH Compliant. For applications requiring REACH compliance, select from SMDJ15A, SMLJ15A-TP, SMCJ15AE3/TR13, SMCJ15A-TP, TV15C150J-G, or TV30C150J-G.

Frequently Asked Questions (FAQ)

Q: Can SMCJ15A-TP replace SMDJ15 directly?

A: SMCJ15A-TP is electrically compatible for voltage parameters but operates at 61.5A peak pulse current versus the original 123A specification. Direct replacement is possible only if circuit design permits reduced transient current handling. The part maintains DO-214AB (SMC) package compatibility and ROHS3 compliance.

Q: What is the difference between SMLJ15A and SMLJ15A-TP?

A: Both parts are manufactured by Micro Commercial Co and share identical electrical specifications (15V standoff, 123A peak pulse, 3000W power). SMLJ15A-TP supports an extended upper operating temperature of 175°C compared to 150°C for SMLJ15A. Selection depends on thermal environment requirements.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the DO-214AB (SMC) surface-mount package, ensuring mechanical and footprint compatibility with the original SMDJ15 design.

Q: Which substitute offers the best availability?

A: SMCJ15A from EVVO Semi shows the highest inventory level at 359,178 pieces. However, this part operates at reduced current (61.5A) and power (600W) specifications. For full electrical equivalence with high availability, SMLJ15A-TP from Micro Commercial Co provides 28,876 pieces in stock.

Q: Does operating temperature range affect substitution?

A: Operating temperature range affects suitability for specific thermal environments. The original SMDJ15 operates from -65°C to 150°C. SMLJ15A-TP and SMCJ15A-TP extend the upper limit to 175°C, suitable for higher-temperature applications. Parts with -55°C minimum (SMDJ15A, SMLJ15A, SMCJ15A-TP, TV15C150J-G, TV30C150J-G) are suitable for standard industrial environments.

Q: What is the significance of clamping voltage differences?

A: The original SMDJ15 specifies 25.62V maximum clamping voltage. All substitute parts specify 24.4V maximum clamping voltage, representing improved clamping performance. Lower clamping voltage provides better transient suppression and is acceptable for replacement applications.