SMDJ75A Equivalent & Substitute Parts Reference

Part Overview

The SMDJ75A is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. The device features a 75V reverse standoff voltage with 121V maximum clamping voltage and 24.8A peak pulse current capability in a DO-214AB (SMC) package. This part is active and in production, with 1230 units currently in stock. Equivalent and substitute parts are identified for applications requiring alternative sourcing, inventory management, or specific manufacturer preferences while maintaining electrical and mechanical compatibility.

Substiute Parts

SMDJ75A

Littelfuse Inc.In Stock: 1296SMDJ75A Datasheet

Current PartRFQ

3SMC75A TR13 PBFREE

Central Semiconductor CorpIn Stock: 30113SMC75A TR13 PBFREE Datasheet

DirectRFQ

SMCJ75A

MeritekIn Stock: 18915SMCJ75A Datasheet

MFR RecommendedRFQ

SMCJ75A

MeritekIn Stock: 18915SMCJ75A Datasheet

MFR RecommendedRFQ

SMDJE75A

Eaton - Electronics DivisionIn Stock: 3588SMDJE75A Datasheet

MFR RecommendedRFQ

SMLJ75A

Bourns Inc.In Stock: 3344SMLJ75A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMDJ75A is determined by the following critical parameters:

• Voltage - Reverse Standoff: 75V (exact match required)
• Voltage - Clamping (Max) @ Ipp: 121V (exact match required)
• Current - Peak Pulse (10/1000µs): 24.8A (exact match required for full equivalence)
• Package / Case: DO-214AB or SMC (mechanical compatibility)
• Mounting Type: Surface Mount (required)
• Type: Zener, Unidirectional (1 channel)

Substitute parts are grouped into two categories:

Full Electrical Equivalents (24.8A Peak Pulse Current): Parts meeting all voltage and current specifications with identical power dissipation (3000W). These provide direct functional replacement.

Reduced Current Equivalents (12.4A Peak Pulse Current): Parts meeting voltage specifications but with reduced peak pulse current (12.4A) and lower power dissipation (1500W). These are suitable for applications with lower transient energy requirements.

Parameter Comparison

Engineering Selection Recommendations

Full Electrical Equivalents (Direct Replacement):

The 3SMC75A TR13 PBFREE (Central Semiconductor Corp), SMDJE75A (Eaton - Electronics Division), and SMLJ75A (Bourns Inc.) are direct electrical equivalents to the SMDJ75A, matching all critical voltage and current specifications with identical 3000W peak pulse power rating. All three are ROHS3 compliant and active products. The 3SMC75A TR13 PBFREE offers the highest inventory availability (2911 units). SMDJE75A and SMLJ75A each provide 3518 and 3274 units respectively. Selection among these three should be based on supplier availability, lead time, and procurement preferences.

Reduced Current Equivalent (Conditional Substitution):

The SMCJ75A (Meritek) meets voltage specifications but operates at half the peak pulse current (12.4A) and half the power dissipation (1500W). This part is suitable only for applications where transient energy levels do not exceed 1500W. The SMCJ75A offers the highest inventory level (18835 units) and is ROHS3 compliant. Use this part only when application requirements confirm that reduced current and power ratings are acceptable.

Compliance Considerations:

All substitute parts maintain ROHS3 compliance and EAR99 export classification. The SMDJ75A and SMLJ75A are REACH Affected; the 3SMC75A TR13 PBFREE, SMCJ75A, and SMDJE75A are REACH Unaffected. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for all parts.

Frequently Asked Questions (FAQ)

Q: Can SMCJ75A be used as a direct replacement for SMDJ75A?

A: The SMCJ75A is electrically compatible for voltage specifications but operates at reduced peak pulse current (12.4A versus 24.8A) and power dissipation (1500W versus 3000W). Use this part only if your application transient energy does not exceed 1500W. For applications requiring full 3000W capability, use 3SMC75A TR13 PBFREE, SMDJE75A, or SMLJ75A instead.

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 PCB layout compatibility with the SMDJ75A.

Q: What is the difference between ROHS3 Compliant and RoHS Compliant designations?

A: Both designations indicate RoHS compliance. ROHS3 Compliant refers to RoHS Directive 2011/65/EU (RoHS 3). The SMDJE75A carries the RoHS Compliant designation. All parts meet applicable RoHS requirements for this product category.

Q: Which substitute part has the best inventory availability?

A: The SMCJ75A (Meritek) has the highest inventory with 18835 units in stock. However, this part has reduced current and power ratings. For full electrical equivalence with high availability, the 3SMC75A TR13 PBFREE offers 2911 units.

Q: Are there temperature range differences between substitute parts?

A: The SMDJ75A operates from -65°C to 150°C. The 3SMC75A TR13 PBFREE matches this range. The SMCJ75A, SMDJE75A, and SMLJ75A operate from -55°C to 150°C, providing a narrower low-temperature range. Verify application requirements if operation below -55°C is necessary.

Q: Can I use SMLJ75A in place of SMDJ75A?

A: Yes. The SMLJ75A (Bourns Inc.) is a full electrical equivalent with matching 75V standoff, 121V clamping, 24.8A peak pulse current, and 3000W power dissipation. It uses the same DO-214AB (SMC) package and is ROHS3 compliant. The operating temperature range is -55°C to 150°C (versus -65°C to 150°C for SMDJ75A).