1SMA58AT3 Equivalent & Substitute Parts

Part Overview

The 1SMA58AT3 is a unidirectional Zener transient voltage suppressor (TVS) diode manufactured by onsemi in the DO-214AC (SMA) surface mount package. This component is designed for general-purpose transient voltage suppression applications with a reverse standoff voltage of 58V and peak pulse current handling of 4.3A. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer Part Number	1SMA58AT3
Manufacturer	onsemi
Category	Transient Voltage Suppressors (TVS)
Type	Zener
Unidirectional Channels	1
Voltage - Reverse Standoff (Typ)	58V
Voltage - Breakdown (Min)	64.4V
Voltage - Clamping (Max) @ Ipp	93.6V
Current - Peak Pulse (10/1000µs)	4.3A
Power - Peak Pulse	400W
Package / Case	DO-214AC, SMA
Mounting Type	Surface Mount
Operating Temperature	-65°C ~ 150°C (TJ)
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the 1SMA58AT3 are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Identical Electrical Performance): Parts that match all critical electrical parameters: 58V reverse standoff voltage, 64.4V minimum breakdown voltage, 93.6V maximum clamping voltage, and 4.3A peak pulse current. These parts maintain the same DO-214AC (SMA) package footprint and are pin-compatible. Direct substitutes include SMAJ58A (MDD), SMAJ58A-TR (STMicroelectronics), SMAJ58A-13-F (Diodes Incorporated), SMAJ58A-TP (Micro Commercial Co), and SMAJ58AE3/TR13 (Microchip Technology).

Similar Substitutes (Compatible Electrical Performance with Package Variations): Parts that maintain the 58V reverse standoff voltage and 64.4V minimum breakdown voltage but may differ in clamping voltage, peak pulse current, or package type. These parts are functionally compatible for the same application class but require verification of specific circuit requirements. Similar substitutes include PTVS58VS1UR,115 (Nexperia, SOD-123W package), SM4T68AY (STMicroelectronics, higher clamping voltage), SMAJ58E3/TR13 (Microchip Technology, higher clamping voltage), and TV04A580J-G (Comchip Technology).

Key Parameters for Substitution Determination:

Reverse Standoff Voltage: 58V (primary selection criterion)
Minimum Breakdown Voltage: 64.4V
Maximum Clamping Voltage: 93.6V (for direct substitutes)
Peak Pulse Current: 4.3A (for direct substitutes)
Package Type: DO-214AC / SMA (for direct substitutes)
Unidirectional Configuration: 1 channel

Parameter Comparison

Part Number	Manufacturer	Vwm (Typ)	Vbr (Min)	Vc (Max)	Ipp	Package	Status	RoHS
1SMA58AT3	onsemi	58V	64.4V	93.6V	4.3A	DO-214AC	Obsolete	Non-compliant
SMAJ58A	MDD	58V	64.4V	93.6V	4.3A	DO-214AC	Active	ROHS3
SMAJ58A-TR	STMicroelectronics	58V	64.4V	93.6V	4.3A	DO-214AC	Active	ROHS3
SMAJ58A-13-F	Diodes Incorporated	58V	64.4V	93.6V	4.3A	DO-214AC	Active	ROHS3
SMAJ58A-TP	Micro Commercial Co	58V	64.4V	93.6V	4.3A	DO-214AC	Active	ROHS3
SMAJ58AE3/TR13	Microchip Technology	58V	64.4V	93.6V	5.3A	DO-214AC	Active	ROHS3
PTVS58VS1UR,115	Nexperia USA Inc.	58V	64.4V	93.6V	4.3A	SOD-123W	Active	ROHS3
SM4T68AY	STMicroelectronics	58V	64.4V	121V	19A	DO-214AC	Active	ROHS3
SMAJ58E3/TR13	Microchip Technology	58V	64.4V	103V	4.9A	DO-214AC	Active	ROHS3
TV04A580J-G	Comchip Technology	58V	64.4V	93.6V	4.27A	DO-214AC	Active	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical and Mechanical Compatibility):

Select SMAJ58A-TR (STMicroelectronics), SMAJ58A-13-F (Diodes Incorporated), or SMAJ58A-TP (Micro Commercial Co) as primary alternatives. All three parts are active products with ROHS3 compliance, matching the 1SMA58AT3 electrical specifications exactly while providing modern manufacturing support. SMAJ58A (MDD) is also electrically identical but operates over a narrower temperature range (-50°C to 150°C versus -65°C to 150°C).

For Applications Requiring Enhanced Performance:

SMAJ58AE3/TR13 (Microchip Technology) provides higher peak pulse current capability (5.3A versus 4.3A) and increased power dissipation (500W versus 400W) while maintaining identical voltage parameters and the same package. This part is suitable for applications requiring additional margin.

For Automotive or Qualified Applications:

SM4T68AY (STMicroelectronics) carries AEC-Q101 automotive qualification and provides significantly higher peak pulse current (19A) and clamping voltage (121V). This part is suitable only if the circuit design can accommodate the higher clamping voltage.

For Package-Constrained Designs:

PTVS58VS1UR,115 (Nexperia USA Inc.) offers identical electrical performance in the SOD-123W package with AEC-Q101 qualification. This option is applicable only if the PCB layout requires a smaller footprint.

All recommended substitutes are RoHS3 compliant and carry REACH Unaffected status, addressing the non-compliance status of the obsolete 1SMA58AT3.

Frequently Asked Questions (FAQ)

Q: Can SMAJ58A-TR be used as a direct replacement for 1SMA58AT3?

A: Yes. SMAJ58A-TR matches all critical electrical parameters (58V standoff, 64.4V breakdown, 93.6V clamping, 4.3A peak pulse) and uses the identical DO-214AC (SMA) package. The part is pin-compatible and electrically interchangeable.

Q: What is the difference between SMAJ58A and SMAJ58A-TR?

A: Both parts are electrically identical. SMAJ58A-TR is supplied in Tape & Reel (TR) packaging by STMicroelectronics, while SMAJ58A (MDD) is supplied in standard packaging. The TR designation indicates reel packaging suitable for automated assembly. Operating temperature ranges differ slightly: SMAJ58A operates -50°C to 150°C, while SMAJ58A-TR operates -55°C to 150°C.

Q: Why would I select SM4T68AY instead of SMAJ58A-TR?

A: SM4T68AY is selected only if your circuit requires higher transient current handling (19A versus 4.3A) or higher clamping voltage (121V versus 93.6V). The higher clamping voltage may not be suitable for all applications. Verify circuit requirements before substitution.

Q: Is PTVS58VS1UR,115 compatible with the 1SMA58AT3?

A: PTVS58VS1UR,115 is electrically compatible but uses the SOD-123W package instead of DO-214AC (SMA). This part is suitable only if your PCB layout can accommodate the different package footprint. Verify pinout compatibility before substitution.

Q: What does RoHS3 compliance mean for this substitution?

A: RoHS3 compliance indicates the substitute parts meet Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. The original 1SMA58AT3 is RoHS non-compliant. Selecting RoHS3-compliant substitutes ensures regulatory compliance for new designs.

Q: Can SMAJ58E3/TR13 be used if my circuit operates at higher voltages?

A: SMAJ58E3/TR13 has a higher clamping voltage (103V versus 93.6V) but maintains the same 58V standoff voltage. This part is suitable only if your circuit design specifically requires the higher clamping voltage. Verify that the higher clamping voltage does not exceed downstream component ratings.

Q: What is the difference between SMAJ58AE3/TR13 and SMAJ58E3/TR13?

A: SMAJ58AE3/TR13 has a clamping voltage of 93.6V and peak pulse current of 5.3A. SMAJ58E3/TR13 has a clamping voltage of 103V and peak pulse current of 4.9A. Both are Microchip Technology products with identical standoff and breakdown voltages. Select based on your specific clamping voltage requirement.

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