SMDJ7.5C Equivalent & Substitute Parts

Part Overview

The SMDJ7.5C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with a 7.5V reverse standoff voltage and provides 3000W peak pulse power dissipation in a DO-214AB (SMC) package. The part is currently listed as obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Voltage - Reverse Standoff (Typ)	7.5V
Voltage - Breakdown (Min)	7.89V
Voltage - Clamping (Max) @ Ipp	14.65V
Current - Peak Pulse (10/1000µs)	232.6A
Power - Peak Pulse	3000W
Package / Case	DO-214AB, SMC
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C
Type	Zener
Bidirectional Channels	1
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the SMDJ7.5C is determined by strict alignment of electrical and mechanical parameters. The critical substitution criteria are:

Electrical Parameters (Must Match):

Voltage - Reverse Standoff: 7.5V
Package / Case: DO-214AB, SMC
Bidirectional Channels: 1
Type: Zener

Performance Parameters (Must Be Equal or Exceed):

Current - Peak Pulse (10/1000µs): minimum 232.6A
Power - Peak Pulse: minimum 3000W
Voltage - Clamping (Max) @ Ipp: must not exceed 14.65V

Compliance Requirements:

RoHS3 Compliant
Surface Mount technology

Substitute parts are grouped into two categories based on peak pulse current and power dissipation capacity:

Category A (Full Equivalents - 232.6A / 3000W): Parts meeting or exceeding the original specifications for both current and power.

Category B (Reduced Capacity - 116.3A / 1500W): Parts with lower peak pulse current and power ratings, suitable only for applications with reduced transient energy requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse	Power - Peak Pulse	Package	Product Status
SMDJ7.5C	Littelfuse Inc.	7.5V	14.65V	232.6A	3000W	DO-214AB, SMC	Obsolete
SMDJ7.5CA	Alpha & Omega Semiconductor Inc.	7.5V	12.9V	232.6A	3000W	DO-214AB, SMC	Active
SMLJ7.5CA	Bourns Inc.	7.5V	12.9V	232.6A	3000W	DO-214AB, SMC	Active
SMLJ7.5CAE3/TR13	Microchip Technology	7.5V	12.9V	232.6A	300W	DO-214AB, SMC	Active
SMCJ7.5CA	Taiwan Semiconductor Corporation	7.5V	12.9V	122A	1500W	DO-214AB, SMC	Active
SMCJ7.5CA-TP	Micro Commercial Co	7.5V	12.9V	116.3A	1500W	DO-214AB, SMC	Active
SMCJ7V5CA	Fairchild Semiconductor	7.5V	12.9V	116.3A	1500W	DO-214AB, SMC	Active
SMLJ7.5CA-TP	Micro Commercial Co	7.5V	12.9V	232.6A	3000W	DO-214AB, SMC	Active
TV15C7V5JB-G	Comchip Technology	7.5V	12.9V	116.28A	1500W	DO-214AB, SMC	Active

Engineering Selection Recommendations

Primary Substitutes (Full Electrical Equivalents):

SMDJ7.5CA (Alpha & Omega Semiconductor Inc.) and SMLJ7.5CA (Bourns Inc.) are direct functional equivalents with active product status and ROHS3 compliance. Both maintain the 232.6A peak pulse current and 3000W power dissipation of the original SMDJ7.5C. SMDJ7.5CA offers the highest inventory availability (22,800 pcs) and is recommended as the primary replacement for new designs and ongoing production.

SMLJ7.5CA-TP (Micro Commercial Co) provides equivalent electrical performance with 3000W power rating and 232.6A current capacity, with extended operating temperature range to 175°C.

Secondary Substitutes (Reduced Capacity):

SMCJ7.5CA (Taiwan Semiconductor Corporation), SMCJ7.5CA-TP (Micro Commercial Co), SMCJ7V5CA (Fairchild Semiconductor), and TV15C7V5JB-G (Comchip Technology) are suitable only for applications where transient energy is limited to 1500W or less. These parts maintain the 7.5V standoff voltage and DO-214AB package compatibility but operate at reduced peak pulse current (116–122A). Selection from this group should be based on application requirements and inventory availability.

Compliance Considerations:

All recommended substitutes maintain ROHS3 compliance. SMLJ7.5CA carries REACH Affected status; other substitutes are REACH Unaffected. Verify REACH compliance requirements for your specific application and supply chain.

Frequently Asked Questions (FAQ)

Q: Can SMCJ7.5CA replace SMDJ7.5C directly?

A: SMCJ7.5CA is electrically compatible with the same 7.5V standoff voltage and DO-214AB package. However, it operates at 1500W peak pulse power versus the original 3000W. Use SMCJ7.5CA only if your application transient energy does not exceed 1500W. For full power equivalence, use SMDJ7.5CA or SMLJ7.5CA.

Q: What is the difference between SMDJ7.5CA and SMLJ7.5CA?

A: Both parts are full electrical equivalents with 232.6A peak pulse current and 3000W power dissipation. SMDJ7.5CA is manufactured by Alpha & Omega Semiconductor with higher inventory (22,800 pcs). SMLJ7.5CA is manufactured by Bourns with lower inventory (3,550 pcs). Selection can be based on supplier availability and lead time.

Q: Why does SMLJ7.5CAE3/TR13 show 300W power rating?

A: This is a data inconsistency in the provided specifications. The part is listed with 232.6A peak pulse current, which typically corresponds to 3000W power dissipation. Verify the actual power rating with the manufacturer before selection.

Q: Are all substitutes available in the same packaging?

A: All listed substitutes use DO-214AB (SMC) surface-mount package. Packaging variants include Tape & Reel (TR) and Bulk options. Confirm packaging format (bulk vs. tape & reel) with your procurement requirements before ordering.

Q: Can I use TV15C7V5JB-G as a direct replacement?

A: TV15C7V5JB-G maintains the 7.5V standoff voltage and DO-214AB package but operates at 1500W peak pulse power and 116.28A peak current. Use only if your application does not require the full 3000W power dissipation of the original part.

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