SMDJ7.5 Equivalent & Substitute Parts

Part Overview

The SMDJ7.5 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 7.5V reverse standoff voltage, 14.65V maximum clamping voltage, and 232.6A peak pulse current capability in a DO-214AB (SMC) package. The product is currently obsolete, necessitating identification of active equivalent and substitute parts that maintain functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

SMDJ7.5

Littelfuse Inc.In Stock: 1153SMDJ7.5 Datasheet

Current PartRFQ

SMDJ7.5A

Alpha & Omega Semiconductor Inc.In Stock: 12252SMDJ7.5A Datasheet

DirectRFQ

SMCJ7.5A

Taiwan Semiconductor CorporationIn Stock: 9312SMCJ7.5A Datasheet

MFR RecommendedRFQ

SMCJ7.5AE3/TR13

Microchip TechnologyIn Stock: 1014SMCJ7.5AE3/TR13 Datasheet

MFR RecommendedRFQ

SMCJ7V5A

Fairchild SemiconductorIn Stock: 12508SMCJ7V5A Datasheet

MFR RecommendedRFQ

SMCJ8.5A-13-F

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

MFR RecommendedRFQ

SMLJ7.5A

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

MFR RecommendedRFQ

SMLJ7.5AE3/TR13

Microchip TechnologyIn Stock: 1106SMLJ7.5AE3/TR13 Datasheet

MFR RecommendedRFQ

TV15C7V5J-G

Comchip TechnologyIn Stock: 1104TV15C7V5J-G Datasheet

MFR RecommendedRFQ

TV15C7V5J-HF

Comchip TechnologyIn Stock: 1179TV15C7V5J-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMDJ7.5 is determined by the following critical parameters:

• Voltage - Reverse Standoff (Typ): Must be 7.5V to maintain circuit protection threshold
• Package / Case: Must be DO-214AB or SMC to ensure mechanical and thermal compatibility
• Mounting Type: Must be Surface Mount for PCB assembly compatibility
• Unidirectional Channels: Must be 1 channel to match circuit topology
• Type: Must be Zener diode for equivalent protection mechanism

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

Category A - Full Performance Equivalents (Peak Pulse Current ≥ 232.6A, Power ≥ 3000W):

• SMDJ7.5A (Alpha & Omega Semiconductor Inc.)
• SMLJ7.5A (Bourns Inc.)
• SMLJ7.5AE3/TR13 (Microchip Technology)

Category B - Reduced Performance Substitutes (Peak Pulse Current 104.2A–116.3A, Power 1500W):

• SMCJ7.5A (Taiwan Semiconductor Corporation)
• SMCJ7.5AE3/TR13 (Microchip Technology)
• SMCJ7V5A (Fairchild Semiconductor)
• TV15C7V5J-HF (Comchip Technology)
• TV15C7V5J-G (Comchip Technology)

Category C - Voltage Variant (8.5V Reverse Standoff):

• SMCJ8.5A-13-F (Diodes Incorporated) — Not a direct substitute; different voltage rating

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Equivalent Performance):

Select SMDJ7.5A, SMLJ7.5A, or SMLJ7.5AE3/TR13 when the circuit requires the full 232.6A peak pulse current and 3000W power dissipation capability of the original SMDJ7.5. All three parts maintain the 7.5V reverse standoff voltage, DO-214AB package compatibility, and RoHS3 compliance. SMDJ7.5A and SMLJ7.5A are available in high inventory quantities (12,200 and 844 units respectively) and carry Active product status. SMLJ7.5AE3/TR13 is supplied in Tape & Reel packaging and maintains REACH Unaffected status.

For Reduced-Stress Applications:

Select SMCJ7.5A, SMCJ7.5AE3/TR13, SMCJ7V5A, TV15C7V5J-HF, or TV15C7V5J-G when circuit transient energy is lower and 116–122A peak pulse current with 1500W power dissipation is sufficient. These parts maintain the 7.5V reverse standoff voltage and DO-214AB package form factor. All carry Active product status and RoHS3 compliance. SMCJ7.5A offers the highest inventory availability (9,300 units).

Avoid:

SMCJ8.5A-13-F has a different voltage rating (8.5V reverse standoff) and is not a direct substitute for the SMDJ7.5.

Frequently Asked Questions (FAQ)

Q: Can SMCJ7.5A replace SMDJ7.5 directly?

A: SMCJ7.5A maintains the same 7.5V reverse standoff voltage and DO-214AB package, but provides reduced peak pulse current (122A vs. 232.6A) and power dissipation (1500W vs. 3000W). It is suitable only for applications where transient energy is lower than the original design specification.

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

A: Both parts provide equivalent electrical performance (232.6A peak pulse, 3000W power, 7.5V standoff voltage) and DO-214AB packaging. The primary difference is manufacturer: SMDJ7.5A is from Alpha & Omega Semiconductor Inc., while SMLJ7.5A is from Bourns Inc. Selection depends on supply chain availability and procurement preferences.

Q: Why does SMLJ7.5AE3/TR13 show 300W power dissipation instead of 3000W?

A: The provided data indicates 300W for SMLJ7.5AE3/TR13, which differs from the 3000W specification of equivalent parts. This discrepancy should be verified against the manufacturer datasheet before final selection for high-energy transient protection applications.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry RoHS3 Compliant status. SMLJ7.5A is marked as REACH Affected; all others are REACH Unaffected or REACH Compliant.

Q: Can I use TV15C7V5J-HF or TV15C7V5J-G interchangeably?

A: Both Comchip Technology parts (TV15C7V5J-HF and TV15C7V5J-G) provide identical electrical specifications (7.5V standoff, 12.9V clamping, 116.28A peak pulse, 1500W power) and DO-214AB packaging. They are functionally interchangeable within reduced-stress applications.

Q: What is the operating temperature range for substitute parts?

A: Most substitute parts operate from -55°C to 150°C. SMCJ7.5AE3/TR13 and SMLJ7.5AE3/TR13 extend the lower limit to -65°C, matching the original SMDJ7.5 specification. SMCJ7V5A does not specify an operating temperature range in the provided data.