SS25FA Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS25FA is a surface mount Schottky rectifier diode manufactured by onsemi, rated for 50 V DC reverse voltage and 2 A average rectified current in a SOD-123F package. This component is classified as Not For New Designs, indicating it has been superseded in the manufacturer's product portfolio. Identification of equivalent and substitute parts is necessary for legacy system support, design continuity, and procurement of functionally compatible alternatives that meet the same electrical and mechanical requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	400 µA @ 50 V	µA
Capacitance @ Vr, F	120 pF @ 4V, 1MHz	pF
Operating Temperature - Junction	-55 to 150	°C
Package / Case	SOD-123F	—
Technology	Schottky	—
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the SS25FA is determined by electrical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 50 V
Current - Average Rectified (Io) must equal or exceed 2 A
Voltage - Forward (Vf) must be within acceptable operating margins
Speed classification must maintain Fast Recovery characteristics
Operating temperature range must encompass -55°C to 150°C
Technology must be Schottky diode

Mechanical Compatibility Criteria:

Surface mount mounting type
Package footprint compatibility or documented pin-compatible alternative

The SS2FN6-M3/H qualifies as a substitute based on these parameters. While it features a different package designation (DO-219AB versus SOD-123F), it maintains electrical equivalence across all critical ratings and operates within the same temperature range.

Parameter Comparison

Parameter	SS25FA (Main Part)	SS2FN6-M3/H (Substitute)	Compatibility
Manufacturer	onsemi	Vishay General Semiconductor - Diodes Division	Different manufacturer
Voltage - DC Reverse (Vr) (Max)	50 V	60 V	Substitute rated higher
Current - Average Rectified (Io)	2 A	2 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	700 mV @ 2 A	600 mV @ 2 A	Substitute lower (improved)
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Current - Reverse Leakage @ Vr	400 µA @ 50 V	900 µA @ 60 V	Substitute higher at higher voltage
Capacitance @ Vr, F	120 pF @ 4V, 1MHz	100 pF @ 4V, 1MHz	Substitute lower
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	Equivalent
Package / Case	SOD-123F	DO-219AB (SMF)	Different package
Technology	Schottky	Schottky	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
REACH Status	REACH Unaffected	REACH Unaffected	Equivalent

Engineering Selection Recommendations

For Legacy System Support: The SS25FA is classified as Not For New Designs. The SS2FN6-M3/H is classified as Active and represents a current production alternative. Both components are ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements.

Electrical Performance: The SS2FN6-M3/H provides superior electrical characteristics: a 10 V higher reverse voltage rating (60 V versus 50 V), lower forward voltage drop (600 mV versus 700 mV at 2 A), and lower junction capacitance (100 pF versus 120 pF). These characteristics make it suitable for applications requiring the SS25FA's electrical specifications.

Package Consideration: The SS2FN6-M3/H uses a DO-219AB (SMF) package, which differs from the SS25FA's SOD-123F package. PCB layout modifications are required for substitution. Verify footprint compatibility with your design before implementation.

Compliance and Qualification: The SS25FA carries AEC-Q101 automotive qualification. The SS2FN6-M3/H is part of the eSMP® series. Confirm that your application's qualification requirements are satisfied by the substitute part's certifications.

Frequently Asked Questions (FAQ)

Q: Can the SS2FN6-M3/H directly replace the SS25FA without PCB modifications?

A: No. The SS25FA uses SOD-123F packaging while the SS2FN6-M3/H uses DO-219AB (SMF) packaging. These packages have different footprints and pin configurations. PCB layout redesign is required.

Q: What is the voltage margin when using SS2FN6-M3/H as a substitute?

A: The SS2FN6-M3/H is rated for 60 V reverse voltage compared to the SS25FA's 50 V rating. This provides a 10 V safety margin above the original specification, suitable for applications operating at or below 50 V.

Q: How do forward voltage characteristics compare?

A: The SS2FN6-M3/H exhibits lower forward voltage (600 mV at 2 A) compared to the SS25FA (700 mV at 2 A). This 100 mV reduction results in lower power dissipation and improved efficiency in rectification circuits.

Q: Are both parts suitable for automotive applications?

A: The SS25FA carries AEC-Q101 qualification. The SS2FN6-M3/H does not list AEC-Q101 qualification in the provided specifications. Verify automotive qualification requirements for your specific application before substitution.

Q: What is the difference in reverse leakage current?

A: The SS25FA exhibits 400 µA reverse leakage at 50 V. The SS2FN6-M3/H exhibits 900 µA reverse leakage at 60 V. The higher leakage in the substitute is measured at a higher voltage rating. Evaluate leakage impact on your circuit's performance requirements.

Q: Can I use the SS2FN6-M3/H in high-frequency switching applications?

A: Both parts are classified as Fast Recovery diodes with recovery time ≤ 500 ns for currents > 200 mA. Both are suitable for high-frequency switching applications within their rated specifications.

Q: What inventory status should I consider?

A: The SS25FA has 23,300 pieces in stock (Not For New Designs status). The SS2FN6-M3/H has 1,081 pieces in stock (Active status). For long-term supply chain planning, the Active status of the SS2FN6-M3/H provides better availability assurance.

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