SMAJ58C Equivalent & Substitute Parts

Part Overview

The SMAJ58C is a transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 58V reverse standoff voltage, 98.28V maximum clamping voltage, and 4.3A peak pulse current capability in a DO-214AC (SMA) package. The SMAJ58C is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Voltage - Reverse Standoff (Typ)	58	V
Voltage - Breakdown (Min)	61.02	V
Voltage - Clamping (Max) @ Ipp	98.28	V
Current - Peak Pulse (10/1000µs)	4.3	A
Power - Peak Pulse	400	W
Operating Temperature Range	-65 to 150	°C (TJ)
Package / Case	DO-214AC, SMA	—
Type	Zener	—
Bidirectional Channels	1	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SMAJ58C is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - Reverse Standoff (Typ): 58V
Package / Case: DO-214AC (SMA)
Type: Zener, Bidirectional
RoHS Status: ROHS3 Compliant
Mounting Type: Surface Mount

Secondary Compatibility Parameters:

Voltage - Breakdown (Min): 61.02V to 64.4V range
Current - Peak Pulse: 4.3A minimum
Power - Peak Pulse: 400W minimum
Operating Temperature: -55°C to 150°C minimum range

Substitute parts are grouped into two categories: direct electrical equivalents with identical clamping voltage specifications, and functional alternatives with higher clamping voltage or current ratings that maintain the same reverse standoff voltage and package form factor.

Parameter Comparison

Part Number	Manufacturer	Voltage - Reverse Standoff (V)	Voltage - Breakdown Min (V)	Voltage - Clamping Max @ Ipp (V)	Current - Peak Pulse (A)	Power - Peak Pulse (W)	Operating Temp (°C)	Product Status
SMAJ58C	Littelfuse Inc.	58	61.02	98.28	4.3	400	-65 to 150	Obsolete
SMAJ58CA	MDD	58	64.4	93.6	4.3	400	-50 to 150	Active
SZ1SMA58CAT3G	Littelfuse Inc.	58	64.4	93.6	4.3	400	-65 to 150	Active
SM4T68CAY	STMicroelectronics	58	64.4	121	19 (8/20µs)	400	-55 to 150	Active
SMAJ58CA-13-F	Diodes Incorporated	58	64.4	93.6	4.3	400	-55 to 150	Active
SMAJ58CA-TP	Micro Commercial Co	58	64.4	93.6	4.3	400	-55 to 175	Active
SMAJ58CAE3/TR13	Microchip Technology	58	64.4	93.6	5.3	500	-65 to 150	Active
SMAJ58CE3/TR13	Microchip Technology	58	64.4	103	4.9	500	-65 to 150	Active
TV04A580JB-G	Comchip Technology	58	64.4	93.6	4.27	400	-55 to 150	Active
TV04A580JB-HF	Comchip Technology	58	64.4	93.6	4.27	400	-55 to 150	Active

Engineering Selection Recommendations

Direct Equivalents (Recommended Primary Substitutes):

SMAJ58CA (MDD), SMAJ58CA-13-F (Diodes Incorporated), TV04A580JB-G (Comchip Technology), and TV04A580JB-HF (Comchip Technology) provide direct electrical equivalence with clamping voltages of 93.6V and peak pulse currents of 4.27A to 4.3A. All are active products with ROHS3 compliance. These parts are suitable for direct replacement in applications where the original 98.28V clamping specification can accommodate a 93.6V maximum.

Littelfuse Recommended Substitute:

SZ1SMA58CAT3G (Littelfuse Inc.) maintains the original manufacturer's design lineage with identical reverse standoff voltage, matching operating temperature range (-65°C to 150°C), and AEC-Q101 automotive qualification. This part is packaged in Tape & Reel format and includes 115pF capacitance specification at 1MHz.

Enhanced Performance Alternatives:

SMAJ58CAE3/TR13 (Microchip Technology) offers increased peak pulse current (5.3A) and power dissipation (500W) while maintaining the 93.6V clamping voltage. SMAJ58CE3/TR13 (Microchip Technology) provides higher clamping voltage (103V) with 500W power rating, suitable for applications requiring additional transient energy absorption.

SM4T68CAY (STMicroelectronics) features significantly higher peak pulse current (19A at 8/20µs) and 121V clamping voltage, appropriate for high-energy transient environments. This part carries AEC-Q101 automotive qualification.

Temperature Range Considerations:

SMAJ58CA-TP (Micro Commercial Co) extends the upper operating temperature to 175°C, suitable for high-temperature applications. All other active substitutes maintain standard -55°C to -65°C minimum operating temperatures.

Frequently Asked Questions (FAQ)

Q: Can SMAJ58CA directly replace SMAJ58C?

A: Yes. Both parts share the 58V reverse standoff voltage, DO-214AC (SMA) package, and 4.3A peak pulse current rating. The clamping voltage differs (93.6V vs. 98.28V), which is acceptable in most general-purpose overvoltage protection circuits where the application tolerance permits this variation.

Q: What is the difference between SMAJ58CA and SZ1SMA58CAT3G?

A: Both provide identical electrical performance (58V standoff, 93.6V clamping, 4.3A peak pulse). SZ1SMA58CAT3G is manufactured by Littelfuse (the original SMAJ58C manufacturer), includes AEC-Q101 automotive qualification, and maintains the full -65°C to 150°C operating range. SMAJ58CA is manufactured by MDD with a -50°C minimum operating temperature.

Q: When should I use SM4T68CAY instead of SMAJ58CA?

A: SM4T68CAY is specified for applications requiring higher transient energy absorption. Its 19A peak pulse current (8/20µs) and 121V clamping voltage handle more severe overvoltage events than the 4.3A / 93.6V specification of SMAJ58CA. Use this part only if circuit analysis confirms the need for enhanced protection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the original SMAJ58C specification.

Q: What packaging formats are available?

A: Most substitute parts are supplied in Tape & Reel (TR) format for automated assembly. SMAJ58CA (MDD) is available without specified packaging. All parts use the DO-214AC (SMA) surface-mount package form factor.

Q: Does operating temperature range affect substitution?

A: Operating temperature range is a secondary consideration. The SMAJ58C operates -65°C to 150°C. Substitutes with narrower ranges (-50°C to 150°C or -55°C to 150°C) are acceptable for applications not requiring full -65°C minimum operation. SMAJ58CA-TP extends to 175°C for high-temperature environments.

Q: Can I use SMAJ58CAE3/TR13 or SMAJ58CE3/TR13 as direct replacements?

A: These Microchip parts are functionally compatible but offer enhanced specifications. SMAJ58CAE3/TR13 provides higher current handling (5.3A) and power dissipation (500W). SMAJ58CE3/TR13 adds higher clamping voltage (103V). Use these only if the application benefits from or requires these enhanced ratings; they are not necessary for standard SMAJ58C applications.

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