SMAJ48CA-TP Equivalent & Substitute Parts

Part Overview

The SMAJ48CA-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 48V reverse standoff voltage and provides 77.4V clamping at peak pulse current, delivering 400W peak pulse power dissipation in a compact DO-214AC (SMA) package. The component is ROHS3 compliant and maintains unlimited moisture sensitivity rating (MSL 1). Finding equivalent and substitute parts is necessary to ensure supply chain flexibility, optimize procurement costs, and maintain design continuity across multiple manufacturing sources while preserving electrical and mechanical compatibility.

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)	5.2	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 175	°C
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ48CA-TP is determined by strict electrical and mechanical parameter matching. The critical parameters that define substitutability are:

Voltage - Reverse Standoff (Typ): 48V
Voltage - Breakdown (Min): 53.3V
Voltage - Clamping (Max) @ Ipp: 77.4V
Current - Peak Pulse (10/1000µs): 5.2A
Power - Peak Pulse: 400W
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Type: Zener
Bidirectional Channels: 1

Parts are classified into two categories:

Direct Equivalents maintain all critical electrical parameters (48V standoff, 53.3V breakdown, 77.4V clamping, 5.2A peak pulse) and identical package specifications. These parts are fully interchangeable at the circuit level.

Similar Parts share the same voltage ratings and package but differ in peak pulse current specifications or clamping voltage. These parts require circuit-level evaluation to confirm suitability for the intended application.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Package / Case	Product Status	RoHS Status
SMAJ48CA-TP	Micro Commercial Co	48V	53.3V	77.4V	5.2A	400W	-55 to 175°C	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ48CA	MDD	48V	53.3V	77.4V	5.2A	400W	-50 to 150°C	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ48CA-13-F	Diodes Incorporated	48V	53.3V	77.4V	5.2A	400W	-55 to 150°C	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ48CA-E3/61	Vishay General Semiconductor - Diodes Division	48V	53.3V	77.4V	5.2A	400W	-55 to 150°C	DO-214AC, SMA	Active	ROHS3 Compliant
P4SMAJ48CA_R1_00001	Panjit International Inc.	48V	53.3V	77.4V	5.2A	400W	-55 to 150°C	DO-214AC, SMA	Active	ROHS3 Compliant
SM4T56CAY	STMicroelectronics	48V	53.3V	100V	23A (8/20µs)	400W	-55 to 150°C	DO-214AC, SMA	Active	ROHS3 Compliant
SMAJ48CA-TR	STMicroelectronics	48V	53.3V	100V	23A (8/20µs)	400W	-55 to 150°C	DO-214AC, SMA	Active	ROHS3 Compliant
SZ1SMA48CAT3G	Littelfuse Inc.	48V	53.3V	77.4V	5.2A	400W	-65 to 150°C	DO-214AC, SMA	Active	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalent Parts (Full Interchangeability):

SMAJ48CA-13-F (Diodes Incorporated), SMAJ48CA-E3/61 (Vishay General Semiconductor - Diodes Division), P4SMAJ48CA_R1_00001 (Panjit International Inc.), and SZ1SMA48CAT3G (Littelfuse Inc.) are direct electrical equivalents to SMAJ48CA-TP. All maintain identical voltage ratings (48V standoff, 53.3V breakdown, 77.4V clamping) and peak pulse current (5.2A). All parts are ROHS3 compliant and carry Active product status. These parts are suitable for direct substitution in applications where the original SMAJ48CA-TP is specified.

The MDD SMAJ48CA variant exhibits identical electrical parameters but operates within a narrower temperature range (-50 to 150°C junction temperature versus -55 to 175°C for the original). This part is suitable for applications operating within the MDD temperature specification.

Similar Parts (Application-Dependent Evaluation Required):

SM4T56CAY (STMicroelectronics) and SMAJ48CA-TR (STMicroelectronics) share the same 48V reverse standoff voltage and DO-214AC package but feature higher clamping voltage (100V) and significantly higher peak pulse current (23A at 8/20µs pulse width). These parts are not direct substitutes and require circuit-level analysis to confirm compatibility with the intended protection scheme.

All substitute parts maintain ROHS3 compliance and Active product status, ensuring regulatory alignment with the original component.

Frequently Asked Questions (FAQ)

Q: Can SMAJ48CA-13-F replace SMAJ48CA-TP in my design?

A: Yes. SMAJ48CA-13-F maintains identical electrical parameters (48V standoff, 53.3V breakdown, 77.4V clamping, 5.2A peak pulse) and package specification (DO-214AC, SMA). Both are ROHS3 compliant and Active status. The parts are electrically interchangeable.

Q: What is the difference between SMAJ48CA-TP and the MDD SMAJ48CA?

A: The MDD SMAJ48CA is electrically identical but operates within a narrower temperature range. The original SMAJ48CA-TP operates from -55 to 175°C, while the MDD variant operates from -50 to 150°C. Use the MDD part only if your application operates within its specified temperature limits.

Q: Why are SM4T56CAY and SMAJ48CA-TR listed as similar rather than direct equivalents?

A: These STMicroelectronics parts differ in two critical parameters. They feature 100V clamping voltage (versus 77.4V) and 23A peak pulse current at 8/20µs pulse width (versus 5.2A at 10/1000µs). These differences alter the transient suppression characteristics and require circuit verification before substitution.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitute parts use DO-214AC (SMA) surface mount package, ensuring mechanical compatibility with the original SMAJ48CA-TP footprint and assembly process.

Q: Which substitute part has the widest operating temperature range?

A: SZ1SMA48CAT3G (Littelfuse Inc.) operates from -65 to 150°C, providing the lowest minimum temperature specification among direct equivalents. The original SMAJ48CA-TP extends to 175°C maximum, which is not matched by any listed substitute.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance status, matching the regulatory requirement of the original SMAJ48CA-TP.

Q: Can I use SZ1SMA48CAT3G in automotive applications?

A: SZ1SMA48CAT3G carries AEC-Q101 automotive qualification. If your application requires automotive-grade components, this part is suitable. The original SMAJ48CA-TP does not specify automotive qualification.

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