SMAJ78CA-TP Equivalent & Substitute Parts

Part Overview

The SMAJ78CA-TP is a Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection in surface-mount applications. This bidirectional zener diode operates with a 78V reverse standoff voltage and 126V maximum clamping voltage, providing transient suppression at 2.2A peak pulse current. The component is Active status and ROHS3 compliant, with unlimited moisture sensitivity rating (MSL 1). Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters within the DO-214AC/SMA form factor.

Substiute Parts

SMAJ78CA-TP

Micro Commercial CoIn Stock: 5777SMAJ78CA-TP Datasheet

Current PartRFQ

SMAJ78CA-13-F

Diodes IncorporatedIn Stock: 10288SMAJ78CA-13-F Datasheet

DirectRFQ

SMAJ78CA

MDDIn Stock: 36912SMAJ78CA Datasheet

SimilarRFQ

SMAJ78CA

MDDIn Stock: 36912SMAJ78CA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SMAJ78CA-TP is determined by the following critical parameters:

• Voltage - Reverse Standoff: 78V (nominal)
• Voltage - Clamping (Max) @ Ipp: 126V
• Package / Case: DO-214AC or SMA equivalent
• Mounting Type: Surface Mount
• Bidirectional Channels: 1
• Type: Zener
• RoHS Compliance: ROHS3 Compliant

Substitute parts must maintain identical voltage specifications (78V standoff, 126V clamping) and surface-mount package compatibility. Peak pulse current and power dissipation may vary within the same product category, provided the part meets or exceeds the original specifications. Operating temperature range variations are acceptable when the substitute part covers the application's required temperature window.

Parameter Comparison

Engineering Selection Recommendations

All listed substitute parts maintain Active product status and ROHS3 compliance, ensuring regulatory alignment and supply chain continuity. The SMAJ78CA-13-F (Diodes Incorporated) provides direct electrical equivalence with identical peak pulse current (2.2A) and operating temperature range (-55 to 150°C), making it a primary substitute when thermal performance within -55 to 150°C is acceptable.

The SMAJ78CA (MDD) variant offers enhanced peak pulse current capability (3.2A) while maintaining identical voltage specifications and package form factor. This part is suitable for applications requiring higher transient current handling within the -50 to 150°C operating window.

Selection between substitutes depends on application temperature requirements and available inventory. All parts are certified for general-purpose transient voltage suppression in surface-mount configurations.

Frequently Asked Questions (FAQ)

Q: Can SMAJ78CA-13-F replace SMAJ78CA-TP in all applications?

A: Yes, provided the application operates within the -55 to 150°C temperature range. Both parts share identical voltage specifications (78V standoff, 126V clamping) and peak pulse current (2.2A), with compatible DO-214AC/SMA packaging.

Q: What is the difference between SMAJ78CA (MDD) and the original SMAJ78CA-TP?

A: The MDD variant provides higher peak pulse current (3.2A versus 2.2A) while maintaining identical voltage ratings and package compatibility. Operating temperature range is -50 to 150°C versus -55 to 175°C for the original. Selection depends on whether the application requires the extended low-temperature performance of the original part.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SMAJ78CA-TP, SMAJ78CA-13-F, and SMAJ78CA (MDD) are all ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What packaging formats are available for these TVS diodes?

A: All listed parts use DO-214AC/SMA surface-mount packaging in Tape & Reel (TR) format, ensuring compatibility with automated assembly processes.

Q: Can the higher current rating of SMAJ78CA (MDD) cause issues in circuits designed for 2.2A?

A: No. The 3.2A rating represents maximum peak pulse current capability. The part will operate correctly in circuits designed for 2.2A, as it will not exceed the circuit's current demands. The higher rating provides additional margin for transient suppression.