SMAJ58-E3/61 Equivalent & Substitute Parts

Part Overview

The SMAJ58-E3/61 is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division, housed in a DO-214AC (SMA) surface mount package. This component is designed for general-purpose transient voltage protection applications with a reverse standoff voltage of 58V and a maximum clamping voltage of 103V at peak pulse current.

The SMAJ58-E3/61 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Active alternatives with comparable electrical and mechanical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	58	V
Voltage - Breakdown (Min)	64.4	V
Voltage - Clamping (Max) @ Ipp	103	V
Current - Peak Pulse (10/1000µs)	3.9	A
Power - Peak Pulse	400	W
Operating Temperature Range	-55 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SMAJ58-E3/61 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Reverse Standoff Voltage: 58V (±tolerance)
Breakdown Voltage (Min): 64.4V
Package / Case: DO-214AC (SMA)
Mounting Type: Surface Mount
Unidirectional Channels: 1
Type: Zener

Allowable Variation Parameters:

Voltage - Clamping (Max) @ Ipp: 93.6V to 103V range acceptable
Current - Peak Pulse (10/1000µs): 3.9A to 5.3A range acceptable
Power - Peak Pulse: 400W to 500W range acceptable
Operating Temperature Range: -65°C to -55°C minimum; 150°C maximum

Substitute parts are grouped into two categories based on clamping voltage alignment:

Group A (93.6V Clamping): SMAJ58A-E3/61, SMAJ58A, SMAJ58A-13-F, SMAJ58A-TR, SZ1SMA58AT3G, TV04A580J-G

Group B (103V Clamping): SMAJ58E3/TR13

Alternative Voltage Class: SM4T68AY (121V clamping, higher current rating)

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (Typ)	Voltage - Breakdown (Min)	Voltage - Clamping (Max) @ Ipp	Current - Peak Pulse (10/1000µs)	Power - Peak Pulse	Operating Temperature	Product Status
SMAJ58-E3/61	Vishay	58V	64.4V	103V	3.9A	400W	-55 to 150°C	Obsolete
SMAJ58A-E3/61	Vishay	58V	64.4V	93.6V	4.3A	400W	-55 to 150°C	Active
SMAJ58A	MDD	58V	64.4V	93.6V	4.3A	400W	-50 to 150°C	Active
SMAJ58A-13-F	Diodes Incorporated	58V	64.4V	93.6V	4.3A	400W	-55 to 150°C	Active
SMAJ58A-TR	STMicroelectronics	58V	64.4V	93.6V	4.3A	400W	-55 to 150°C	Active
SMAJ58AE3/TR13	Microchip Technology	58V	64.4V	93.6V	5.3A	500W	-65 to 150°C	Active
SMAJ58E3/TR13	Microchip Technology	58V	64.4V	103V	4.9A	500W	-65 to 150°C	Active
SZ1SMA58AT3G	Littelfuse	58V	64.4V	93.6V	4.3A	400W	-65 to 150°C	Active
TV04A580J-G	Comchip Technology	58V	64.4V	93.6V	4.27A	400W	-55 to 150°C	Active
SM4T68AY	STMicroelectronics	58V	64.4V	121V	19A (8/20µs)	400W	-55 to 150°C	Active

Engineering Selection Recommendations

Direct Replacement (Identical Clamping Voltage):

SMAJ58E3/TR13 (Microchip Technology) is the direct functional equivalent to SMAJ58-E3/61, maintaining the 103V clamping voltage specification. This part is active and available in volume. It offers enhanced operating temperature range (-65°C minimum) and increased power dissipation (500W vs. 400W), providing superior thermal performance.

Primary Substitutes (Lower Clamping Voltage):

SMAJ58A-E3/61 (Vishay), SMAJ58A-13-F (Diodes Incorporated), SMAJ58A-TR (STMicroelectronics), and SZ1SMA58AT3G (Littelfuse) are functionally equivalent with 93.6V clamping voltage. These parts maintain the 58V reverse standoff voltage and 64.4V minimum breakdown voltage. All are active products with established supply chains. SZ1SMA58AT3G includes automotive qualification (AEC-Q101) and extended temperature range (-65°C minimum).

Alternative Selection (Higher Current Rating):

SM4T68AY (STMicroelectronics) provides significantly higher peak pulse current (19A at 8/20µs) and clamping voltage (121V). This part is suitable for applications requiring enhanced transient suppression capability. It carries automotive qualification (AEC-Q101).

Compliance Considerations:

All substitute parts are ROHS3 compliant, MSL 1 (Unlimited), and REACH unaffected. All maintain the DO-214AC (SMA) surface mount package for direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can SMAJ58A-E3/61 replace SMAJ58-E3/61 directly?

A: Yes. Both parts share identical reverse standoff voltage (58V), breakdown voltage (64.4V), and package (DO-214AC SMA). The clamping voltage differs (93.6V vs. 103V), which is within acceptable substitution parameters for general-purpose transient suppression. Verify circuit design margins for clamping voltage tolerance.

Q: What is the difference between Group A (93.6V) and Group B (103V) substitutes?

A: Group A parts clamp transients at 93.6V maximum, while Group B (SMAJ58E3/TR13) clamps at 103V, matching the original SMAJ58-E3/61 specification. Selection depends on circuit protection requirements and voltage margin specifications.

Q: Is SZ1SMA58AT3G suitable for automotive applications?

A: Yes. SZ1SMA58AT3G carries AEC-Q101 automotive qualification and is rated for -65°C to 150°C operating temperature. It is suitable for automotive and industrial applications requiring enhanced reliability.

Q: Can SM4T68AY be used as a substitute?

A: SM4T68AY is functionally compatible but operates at higher clamping voltage (121V) and significantly higher peak pulse current (19A). Use this part only if circuit design requires enhanced transient suppression capability beyond the original specification.

Q: Are all substitutes available in the same packaging?

A: Yes. All substitute parts use DO-214AC (SMA) surface mount package, ensuring direct PCB compatibility without layout modifications.

Q: What is the impact of operating temperature range differences?

A: Parts with extended minimum temperature (-65°C vs. -55°C) provide broader environmental coverage. Parts with extended maximum temperature maintain performance across wider thermal ranges. Verify application requirements against specified operating temperature range.

Q: Do all substitutes maintain RoHS3 compliance?

A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, ensuring compatibility with standard manufacturing and storage processes.

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