MASMBJ48CA Equivalent & Substitute Parts

Part Overview

The MASMBJ48CA 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 48V reverse standoff voltage and provides 77.4V clamping at peak pulse current. The component is currently active in production and available in bulk packaging with 862 units in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to component availability, supply chain considerations, or design flexibility within the same application category.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	48	V
Voltage - Breakdown (Min)	53.3	V
Voltage - Clamping (Max) @ Ipp	77.4	V
Current - Peak Pulse (10/1000µs)	7.7	A
Power - Peak Pulse	600	W
Bidirectional Channels	1	—
Type	Zener	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature Range	-65°C ~ 150°C	TJ

Substitute Part Grouping Explanation

Substitution of transient voltage suppressor diodes is determined by electrical equivalence across the following critical parameters:

Voltage Rating: Reverse standoff voltage, breakdown voltage minimum, and clamping voltage must match the main part specification
Current Handling: Peak pulse current (Ipp) at the standard 10/1000µs waveform must be equivalent
Power Dissipation: Peak pulse power rating must support the same transient energy absorption
Diode Type: Zener topology and bidirectional channel configuration must be identical
Package Compatibility: Surface-mount package designation (DO-214AA/SMB) must be mechanically compatible with the PCB footprint
Operating Temperature: The specified temperature range must encompass the application environment

The SMBJ48CA-13 from Diodes Incorporated meets all electrical parameters required for direct substitution in the MASMBJ48CA application space.

Parameter Comparison

Parameter	MASMBJ48CA (Microchip)	SMBJ48CA-13 (Diodes Inc.)	Match
Voltage - Reverse Standoff (Typ)	48V	48V	✓
Voltage - Breakdown (Min)	53.3V	53.3V	✓
Voltage - Clamping (Max) @ Ipp	77.4V	77.4V	✓
Current - Peak Pulse (10/1000µs)	7.7A	7.7A	✓
Power - Peak Pulse	600W	600W	✓
Type	Zener	Zener	✓
Bidirectional Channels	1	1	✓
Mounting Type	Surface Mount	Surface Mount	✓
Package / Case	DO-214AA, SMB	DO-214AA, SMB	✓
Operating Temperature Range	-65°C ~ 150°C	-55°C ~ 150°C	Partial*

*Operating temperature range: The SMBJ48CA-13 supports -55°C to 150°C, which covers the upper portion of the MASMBJ48CA range (-65°C to 150°C). Applications requiring operation below -55°C require the MASMBJ48CA.

Engineering Selection Recommendations

MASMBJ48CA (Microchip Technology)

Status: Active product in production
Inventory: 862 units in stock
Compliance: MIL-PRF-19500 qualified; Military grade
Temperature Range: -65°C ~ 150°C (extended low-temperature capability)
Selection Basis: Primary choice for applications requiring military qualification, extended temperature operation below -55°C, or long-term supply assurance

SMBJ48CA-13 (Diodes Incorporated)

Status: Discontinued at DiGi Electronics
Inventory: 883 units in stock
Compliance: RoHS non-compliant; REACH unaffected
Temperature Range: -55°C ~ 150°C
Selection Basis: Electrical equivalent for applications operating within -55°C to 150°C range; suitable for general-purpose protection where military qualification is not required

Both parts share identical electrical specifications for voltage clamping, peak pulse current, and power dissipation. Selection between them depends on temperature range requirements, supply availability, and compliance certifications needed for the end application.

Frequently Asked Questions (FAQ)

Q: Can SMBJ48CA-13 replace MASMBJ48CA in all applications?

A: Electrical substitution is valid for applications operating within the -55°C to 150°C temperature range. Applications requiring operation below -55°C must use the MASMBJ48CA due to its extended low-temperature specification of -65°C.

Q: Are the package footprints identical?

A: Both parts use the DO-214AA/SMB surface-mount package. PCB footprints are mechanically compatible, and no layout modifications are required for substitution.

Q: What is the difference in product status between these parts?

A: MASMBJ48CA is an active product with ongoing production. SMBJ48CA-13 is discontinued at DiGi Electronics, indicating limited future availability through standard distribution channels.

Q: Do both parts meet the same compliance standards?

A: MASMBJ48CA carries MIL-PRF-19500 military qualification and military-grade classification. SMBJ48CA-13 does not carry military qualification. Applications requiring military compliance must specify MASMBJ48CA.

Q: Are the electrical parameters identical?

A: Yes. Both parts provide 48V reverse standoff voltage, 77.4V clamping voltage, 7.7A peak pulse current, and 600W peak pulse power. Electrical performance in transient suppression applications is equivalent.

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

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

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