SMA4F48A Equivalent & Substitute Parts

Part Overview

The SMA4F48A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by STMicroelectronics, designed for general-purpose overvoltage protection applications. This component features a 48V reverse standoff voltage with 100V maximum clamping voltage and 23A peak pulse current capability in the SMAflat package configuration.

The SMA4F48A is classified as an obsolete product. Identification of equivalent and substitute parts is necessary to support ongoing maintenance, repair, and new design requirements where this component is specified or currently deployed.

Substiute Parts

SMA4F48A

STMicroelectronicsIn Stock: 1113SMA4F48A Datasheet

Current PartRFQ

SMAJ43A-TR

STMicroelectronicsIn Stock: 1200SMAJ43A-TR Datasheet

DirectRFQ

SMAJ48A-TR

STMicroelectronicsIn Stock: 2557SMAJ48A-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMA4F48A is determined by electrical and mechanical parameter compatibility within the Transient Voltage Suppressor category. The following criteria establish valid substitute relationships:

Primary Substitution Criteria:

• Voltage - Reverse Standoff (Typ): 48V nominal
• Voltage - Clamping (Max) @ Ipp: 100V nominal
• Current - Peak Pulse (8/20µs): 23A nominal
• Power - Peak Pulse: 400W
• Unidirectional channel configuration: 1 channel
• Type: Zener diode
• Applications: General Purpose
• RoHS3 Compliance: Required
• Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Factors:

• Surface mount mounting type
• Operating temperature range capability
• Package form factor (SMA variants)

The substitute parts identified maintain electrical equivalence in voltage regulation and current handling characteristics while accommodating package form variations within the SMA family.

Parameter Comparison

Engineering Selection Recommendations

SMAJ48A-TR is the manufacturer-recommended direct substitute for the SMA4F48A. This part maintains identical electrical specifications: 48V reverse standoff voltage, 100V clamping voltage, and 23A peak pulse current. The SMAJ48A-TR is classified as an active product with current manufacturing support and inventory availability. The primary difference is the package form factor (DO-214AC SMA versus DO-221AC SMAflat), which requires PCB layout modification but does not affect electrical performance. The operating temperature range is reduced to -55°C to 150°C compared to the original -55°C to 175°C specification. Both parts maintain ROHS3 compliance and unlimited moisture sensitivity rating.

SMAJ43A-TR is an alternative substitute with lower voltage specifications: 43V reverse standoff and 91V clamping voltage. This part is suitable only for applications where the lower voltage threshold is acceptable. The peak pulse current is slightly higher at 25A. This substitute introduces a voltage derating of approximately 5V in standoff and 9V in clamping characteristics and should be selected only when circuit requirements permit lower voltage protection thresholds.

Both substitute parts are active products with established supply chains and are ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can SMAJ48A-TR be used as a direct replacement for SMA4F48A in existing designs?

A: SMAJ48A-TR provides electrical equivalence with identical voltage and current specifications. The package form differs (DO-214AC SMA versus DO-221AC SMAflat), requiring PCB footprint modification. The operating temperature maximum is reduced from 175°C to 150°C. Verify that the application does not require operation above 150°C junction temperature.

Q: What is the difference between SMAflat and SMA package forms?

A: SMAflat (DO-221AC) and SMA (DO-214AC) are distinct surface-mount package configurations within the SMA family. Both are surface-mount diode packages with different lead geometries and PCB footprints. Component selection must match the PCB layout design.

Q: When should SMAJ43A-TR be selected instead of SMAJ48A-TR?

A: SMAJ43A-TR is selected only when circuit design specifications permit a 43V reverse standoff voltage and 91V clamping voltage. This part is not a direct equivalent but an alternative for lower-voltage protection applications. Verify circuit requirements before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. Both SMAJ48A-TR and SMAJ43A-TR are ROHS3 compliant with moisture sensitivity level 1 (unlimited), matching the compliance profile of the SMA4F48A.

Q: What is the inventory status of substitute parts?

A: SMAJ48A-TR has 2468 pieces in stock. SMAJ43A-TR has 1130 pieces in stock. Both are active products with established supply availability.

Q: Does the operating temperature range difference affect substitution suitability?

A: The SMA4F48A operates to 175°C junction temperature, while both SMAJ substitutes operate to 150°C. Applications requiring sustained operation above 150°C junction temperature cannot use these substitutes. Verify thermal design requirements before selection.