SMCJ7.5C-E3/9AT Equivalent & Substitute Parts

Part Overview

The SMCJ7.5C-E3/9AT is a transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, designed for general-purpose overvoltage protection in surface-mount applications. This part operates with a 7.5V reverse standoff voltage and provides 14.3V maximum clamping voltage at peak pulse current. The component is classified as obsolete, necessitating identification of active equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and field replacement requirements.

Key Parameters

Parameter	Value
Reverse Standoff Voltage (Typ)	7.5V
Breakdown Voltage (Min)	8.33V
Clamping Voltage (Max) @ Ipp	14.3V
Peak Pulse Current (10/1000µs)	104.9A
Peak Pulse Power	1500W
Package Type	DO-214AB (SMC)
Mounting Type	Surface Mount
Operating Temperature Range	-55°C to 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the SMCJ7.5C-E3/9AT is determined by strict electrical and mechanical parameter matching within the TVS diode category. The following criteria establish functional equivalence:

Primary Matching Criteria:

Reverse standoff voltage: 7.5V (identical)
Breakdown voltage minimum: 8.33V (identical)
Package type: DO-214AB or SMC (identical mechanical footprint)
Mounting type: Surface mount (identical)
Peak pulse power rating: 1500W (identical)
Bidirectional channels: 1 (identical)
Type: Zener (identical)

Secondary Compatibility Parameters:

Clamping voltage tolerance: 12.9V to 14.3V (acceptable range for general-purpose applications)
Peak pulse current: 104.9A to 122A (acceptable range within same power class)
Operating temperature range: -55°C to 150°C minimum (acceptable if equal or extended)
RoHS and REACH compliance: ROHS3 Compliant, REACH Unaffected (required)
Moisture sensitivity: MSL 1 (required)

Substitutes are grouped by clamping voltage specification: Group A (14.3V clamping) provides direct electrical equivalence; Group B (12.9V clamping) provides functional equivalence with lower clamping voltage suitable for applications with relaxed clamping requirements.

Parameter Comparison

Part Number	Manufacturer	Status	Clamping Voltage (Max) @ Ipp	Peak Pulse Current	Operating Temp Range	Package	Inventory
SMCJ7.5C-E3/9AT	Vishay	Obsolete	14.3V	104.9A	-55°C to 150°C	DO-214AB	869 Pcs
SMCJ7.5CE3/TR13	Microchip Technology	Active	14.3V	104.9A	-65°C to 150°C	DO-214AB	1098 Pcs
SMCJ7.5CA-E3/9AT	Vishay	Active	12.9V	116.3A	-55°C to 150°C	DO-214AB	842 Pcs
SMCJ7.5CA	Taiwan Semiconductor	Active	12.9V	122A	-55°C to 150°C	DO-214AB	15100 Pcs
SMCJ7.5CA-13-F	Diodes Incorporated	Active	12.9V	116.3A	-55°C to 150°C	DO-214AB	6300 Pcs
SMCJ7.5CA-HR	Littelfuse Inc.	Active	12.9V	116.3A	-65°C to 150°C	DO-214AB	755 Pcs
SMCJ7.5CA-HRA	Littelfuse Inc.	Active	12.9V	116.3A	-65°C to 150°C	DO-214AB	891 Pcs
SMCJ7.5CA-HRAT7	Littelfuse Inc.	Active	12.9V	116.3A	-65°C to 150°C	DO-214AB	1003 Pcs
SMCJ7.5CA-TP	Micro Commercial Co	Active	12.9V	116.3A	-55°C to 175°C	DO-214AB	4098 Pcs
SMCJ7.5CAE3/TR13	Microchip Technology	Active	12.9V	116.3A	-65°C to 150°C	DO-214AB	629 Pcs

Engineering Selection Recommendations

Direct Electrical Equivalent (14.3V Clamping):

SMCJ7.5CE3/TR13 (Microchip Technology) is the primary direct substitute, matching the original 14.3V clamping voltage and 104.9A peak pulse current. This part is active, ROHS3 compliant, and extends the operating temperature range to -65°C, providing enhanced thermal performance. Tape & Reel packaging is standard for production environments.

Functional Equivalents (12.9V Clamping):

For applications where 12.9V clamping voltage is acceptable, multiple active alternatives exist:

SMCJ7.5CA (Taiwan Semiconductor Corporation) offers the highest inventory availability (15100 Pcs) with 122A peak pulse current and active product status. This part is suitable for high-volume procurement.

SMCJ7.5CA-TP (Micro Commercial Co) provides the widest operating temperature range (-55°C to 175°C) and substantial inventory (4098 Pcs), making it suitable for applications requiring extended thermal performance.

SMCJ7.5CA-HR, SMCJ7.5CA-HRA, and SMCJ7.5CA-HRAT7 (Littelfuse Inc.) extend the lower operating temperature limit to -65°C, suitable for military or aerospace applications requiring enhanced cold-temperature performance.

All substitute parts maintain DO-214AB package compatibility, surface-mount configuration, 1500W peak pulse power rating, ROHS3 compliance, and MSL 1 moisture sensitivity level.

Frequently Asked Questions (FAQ)

Q: Can SMCJ7.5CE3/TR13 directly replace SMCJ7.5C-E3/9AT?

A: Yes. SMCJ7.5CE3/TR13 matches the original part's 14.3V clamping voltage, 104.9A peak pulse current, and DO-214AB package. Both are Zener-type TVS diodes with identical reverse standoff voltage (7.5V) and peak pulse power (1500W). The substitute is active and ROHS3 compliant.

Q: What is the difference between 14.3V and 12.9V clamping voltage substitutes?

A: Clamping voltage determines the maximum voltage the TVS diode allows across its terminals during transient suppression. The original part clamps at 14.3V maximum; 12.9V clamping substitutes suppress transients to a lower voltage level. Selection depends on the protected circuit's voltage tolerance. Both maintain identical reverse standoff voltage (7.5V) and are suitable for general-purpose applications.

Q: Are all substitute parts in the same DO-214AB package?

A: Yes. All listed substitutes use DO-214AB (SMC) surface-mount package, ensuring mechanical and footprint compatibility with the original design. No PCB layout modifications are required.

Q: Which substitute offers the best temperature performance?

A: SMCJ7.5CA-TP (Micro Commercial Co) provides the widest operating range (-55°C to 175°C). Littelfuse variants (SMCJ7.5CA-HR, SMCJ7.5CA-HRA, SMCJ7.5CA-HRAT7) and Microchip parts extend the lower limit to -65°C. Selection depends on application thermal requirements.

Q: Are all substitutes RoHS and REACH compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What inventory considerations apply to substitute selection?

A: SMCJ7.5CA (Taiwan Semiconductor) offers maximum availability at 15100 Pcs. SMCJ7.5CA-TP provides 4098 Pcs with extended temperature range. SMCJ7.5CE3/TR13 (direct electrical equivalent) has 1098 Pcs available. Procurement strategy should balance electrical requirements with supply chain availability.

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