MASMCJ78CA Equivalent & Substitute Parts

Part Overview

The MASMCJ78CA is a transient voltage suppressor (TVS) diode manufactured by Microchip Technology, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional Zener diode operates with a reverse standoff voltage of 78V and provides clamping at 126V maximum, with a peak pulse current rating of 11.4A. The component is housed in a DO-214AB (SMC) package and is qualified to MIL-PRF-19500 military standards. Identification of equivalent and substitute parts is necessary when the primary part becomes unavailable, when alternative suppliers are required, or when design flexibility is needed within the specified electrical and mechanical parameters.

Substiute Parts

MASMCJ78CA

Microchip TechnologyIn Stock: 714MASMCJ78CA Datasheet

Current PartRFQ

SMCJ78CA-13

Diodes IncorporatedIn Stock: 1215SMCJ78CA-13 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MASMCJ78CA is permissible with parts that maintain identical electrical performance across the critical voltage and current parameters. The following criteria establish substitution validity:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 78V
• Voltage - Breakdown (Min): 86.7V
• Voltage - Clamping (Max) @ Ipp: 126V
• Current - Peak Pulse (10/1000µs): 11.4A
• Power - Peak Pulse: 1500W
• Package / Case: DO-214AB or SMC equivalent
• Mounting Type: Surface Mount
• Type: Zener
• Bidirectional Channels: 1

The SMCJ78CA-13 manufactured by Diodes Incorporated satisfies all primary electrical parameters and package requirements. This part maintains the same voltage ratings, current handling, and power dissipation specifications. The operating temperature range differs slightly (-55°C to 150°C versus -65°C to 150°C for the main part), which represents a narrower specification suitable for most general-purpose applications. Both parts are classified as RoHS non-compliant and carry identical REACH and ECCN designations.

Parameter Comparison

Engineering Selection Recommendations

SMCJ78CA-13 (Diodes Incorporated) is a direct electrical equivalent to the MASMCJ78CA. Selection of this substitute part is appropriate when:

• The primary MASMCJ78CA is unavailable from the original manufacturer or supplier
• Design flexibility permits use of a part with a narrower operating temperature range (-55°C to 150°C)
• Applications do not require operation below -55°C
• Compliance with MIL-PRF-19500 military qualification is not a mandatory design requirement

The SMCJ78CA-13 is currently listed as discontinued at DiGi Electronics, which may affect long-term availability. Both the main part and substitute maintain identical electrical performance for general-purpose transient voltage suppression applications. The choice between these parts should be based on supplier availability, procurement lead times, and specific application temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can the SMCJ78CA-13 be used as a direct replacement for the MASMCJ78CA in all applications?

A: The SMCJ78CA-13 provides identical electrical performance in voltage clamping, peak pulse current, and power dissipation. The operating temperature range is narrower (-55°C to 150°C versus -65°C to 150°C). Direct substitution is valid for applications operating within the -55°C to 150°C range. Applications requiring operation below -55°C require the original MASMCJ78CA or an equivalent with the extended lower temperature specification.

Q: Are the package dimensions identical between MASMCJ78CA and SMCJ78CA-13?

A: Both parts use the DO-214AB (SMC) surface-mount package. This package designation ensures mechanical and electrical compatibility for PCB assembly and soldering processes.

Q: What is the significance of the MIL-PRF-19500 qualification on the MASMCJ78CA?

A: The MASMCJ78CA carries MIL-PRF-19500 military qualification, indicating compliance with military performance standards. The SMCJ78CA-13 does not carry this qualification. If military-grade certification is a design requirement, the original MASMCJ78CA must be specified.

Q: Do both parts have the same RoHS and REACH compliance status?

A: Both the MASMCJ78CA and SMCJ78CA-13 are RoHS non-compliant and REACH unaffected. They carry identical environmental and export control designations (ECCN: EAR99).

Q: What is the moisture sensitivity level for these parts?

A: Both parts carry MSL 1 (Unlimited) classification, indicating no moisture sensitivity restrictions for storage or handling.

Q: Are there other substitute parts listed for the SMCJ78CA-13?

A: The SMCJ78CA-13 documentation references additional substitute part numbers: ATV15C780JB-HF, SMCJ78CE3/TR13, SMCJ78CA-HR, TV15C780JB-HF, and SMCJ78CA-HRAT7. These parts maintain the same electrical specifications and package type. Verification of availability and specific application compatibility is necessary before selection.