SMA4F58A Equivalent & Substitute Parts

Part Overview

The SMA4F58A is a unidirectional transient voltage suppressor (TVS) diode manufactured by STMicroelectronics, designed for general-purpose overvoltage protection in surface-mount applications. This component features a 58V reverse standoff voltage with a 121V maximum clamping voltage and 19A peak pulse current capability in an SMAflat package configuration.

The SMA4F58A is classified as an obsolete product. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this component.

Substiute Parts

SMA4F58A

STMicroelectronicsIn Stock: 11402SMA4F58A Datasheet

Current PartRFQ

SMAJ58A-TR

STMicroelectronicsIn Stock: 25700SMAJ58A-TR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMA4F58A is determined by electrical and mechanical compatibility within the transient voltage suppressor category. The following parameters establish the substitution criteria:

Primary Electrical Parameters:

• Voltage - Reverse Standoff: 58V nominal
• Voltage - Breakdown (Min): 64.4V to 64.6V range
• Unidirectional channel configuration (1 channel)
• Type: Zener diode

Secondary Electrical Parameters:

• Voltage - Clamping (Max) @ Ipp: Must accommodate circuit protection requirements
• Current - Peak Pulse: Dependent on application current handling needs
• Power - Peak Pulse: 400W rating maintained

Mechanical & Compliance Parameters:

• Surface mount technology
• RoHS3 compliance
• Moisture Sensitivity Level 1 (Unlimited)
• REACH Unaffected status
• General-purpose application classification

The SMAJ58A-TR maintains the core voltage standoff and breakdown specifications while operating within the same compliance framework. Differences in clamping voltage and peak pulse current reflect package-level variations between the SMAflat (DO-221AC) and SMA (DO-214AC) form factors.

Parameter Comparison

Engineering Selection Recommendations

SMAJ58A-TR as Substitute for SMA4F58A:

The SMAJ58A-TR is an active-status substitute for the obsolete SMA4F58A. Both components share identical reverse standoff voltage (58V) and comparable breakdown voltage specifications (64.4V vs. 64.6V), establishing electrical compatibility at the core protection threshold level.

Compliance Alignment: Both parts maintain ROHS3 compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited), ensuring regulatory and environmental compatibility across supply chain transitions.

Product Status Advantage: The SMAJ58A-TR carries active product status from STMicroelectronics, providing assured long-term availability and manufacturing support compared to the obsolete SMA4F58A.

Package and Performance Considerations: The substitution involves a transition from SMAflat (DO-221AC) to standard SMA (DO-214AC) packaging. This package change results in reduced peak pulse current capability (4.3A versus 19A) and lower maximum clamping voltage (93.6V versus 121V). These differences reflect the physical and thermal characteristics of the smaller SMA package form factor.

Selection of the SMAJ58A-TR is appropriate for applications where the reduced current and clamping specifications align with circuit protection requirements. Applications requiring the full 19A peak pulse current or 121V clamping voltage of the original SMA4F58A may require alternative component evaluation.

Frequently Asked Questions (FAQ)

Q: What makes SMAJ58A-TR a valid substitute for SMA4F58A?

A: Both components are unidirectional TVS diodes from STMicroelectronics with identical 58V reverse standoff voltage and comparable breakdown voltage specifications (64.4V to 64.6V range). Both maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), establishing electrical and regulatory compatibility.

Q: What are the key differences between these parts?

A: The primary differences are package form factor (SMAflat DO-221AC versus standard SMA DO-214AC), peak pulse current rating (19A versus 4.3A), maximum clamping voltage (121V versus 93.6V), and maximum operating temperature (175°C versus 150°C). The SMAJ58A-TR is an active product, while the SMA4F58A is obsolete.

Q: Can SMAJ58A-TR handle the same current levels as SMA4F58A?

A: No. The SMAJ58A-TR is rated for 4.3A peak pulse current compared to 19A for the SMA4F58A. Applications requiring the full 19A capability must evaluate alternative components or confirm that circuit protection requirements can be met with the lower current rating.

Q: Are there package compatibility considerations for PCB layout?

A: Yes. The SMA4F58A uses SMAflat (DO-221AC) packaging with flat leads, while the SMAJ58A-TR uses standard SMA (DO-214AC) packaging. PCB footprints differ between these package types and must be verified for mechanical compatibility before component substitution.

Q: Do both parts meet the same environmental and compliance standards?

A: Yes. Both the SMA4F58A and SMAJ58A-TR are ROHS3 compliant, REACH Unaffected, and carry Moisture Sensitivity Level 1 (Unlimited). Both are classified for general-purpose applications with identical power dissipation ratings (400W peak pulse).

Q: Why is the SMA4F58A listed as obsolete?

A: The SMA4F58A has reached end-of-life status with STMicroelectronics. The SMAJ58A-TR represents the active product line continuation for 58V TVS diode protection in the SMA package family, ensuring ongoing manufacturing support and supply chain availability.

Q: What should be verified before implementing SMAJ58A-TR as a substitute?

A: Verify that circuit protection requirements can be met with the reduced peak pulse current (4.3A) and lower clamping voltage (93.6V) specifications. Confirm PCB footprint compatibility with the SMA (DO-214AC) package. Validate that the maximum operating temperature of 150°C is sufficient for the application environment.