SS22FA Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS22FA is a 20V, 2A Schottky rectifier diode manufactured by onsemi in SOD-123FA surface mount packaging. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The diode features fast recovery characteristics suitable for switching applications requiring low forward voltage drop and rapid reverse recovery. Identification of equivalent substitute parts is necessary for design continuity, inventory management, and ongoing production support for existing applications utilizing this component.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	20	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	400 µA @ 20 V	µA
Technology	Schottky	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 125°C	°C
RoHS Status	ROHS3 Compliant	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the SS22FA is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) rating must equal or exceed 20V
Current - Average Rectified (Io) must equal or exceed 2A
Voltage - Forward (Vf) must be compatible with circuit design specifications
Speed classification must maintain Fast Recovery characteristics
Technology must be Schottky diode type

Mechanical Compatibility Criteria:

Mounting type must be Surface Mount
Package footprint must be compatible with PCB layout
Moisture Sensitivity Level (MSL) must be acceptable for assembly processes

Compliance Criteria:

RoHS3 compliance required
Automotive grade preferred for applications requiring AEC-Q101 qualification

Two substitute parts meet these criteria with varying degrees of parameter alignment and package compatibility.

Parameter Comparison

Parameter	SS22FA (onsemi)	SS2020FL_R1_00001 (Panjit)	SS2FL3-M3/H (Vishay)
Voltage - DC Reverse (Vr) (Max)	20 V	20 V	30 V
Current - Average Rectified (Io)	2 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	500 mV @ 2 A	540 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	400 µA @ 20 V	100 µA @ 20 V	200 µA @ 30 V
Technology	Schottky	Schottky	Schottky
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123W	SOD-123F	DO-219AB
Operating Temperature - Junction	-55°C ~ 125°C	-50°C ~ 150°C	-55°C ~ 150°C
Product Status	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	Automotive	—	—
Qualification	AEC-Q101	—	—

Engineering Selection Recommendations

SS2020FL_R1_00001 (Panjit International Inc.)

This substitute provides the closest electrical match to the SS22FA. Both devices share identical voltage ratings (20V), current ratings (2A), and forward voltage specifications (500 mV @ 2A). The SS2020FL_R1_00001 demonstrates superior reverse leakage performance (100 µA versus 400 µA), indicating lower standby current consumption. The extended operating temperature range (-50°C ~ 150°C) accommodates broader thermal environments compared to the SS22FA (-55°C ~ 125°C). Product status is Active, ensuring continued availability and supply chain stability. Package compatibility requires PCB layout verification due to SOD-123F versus SOD-123W package differences. RoHS3 compliance is maintained. This substitute is suitable for applications where automotive qualification is not mandatory.

SS2FL3-M3/H (Vishay General Semiconductor - Diodes Division)

This substitute provides elevated voltage rating (30V) relative to the SS22FA (20V), offering design margin for overvoltage transient conditions. Current rating (2A) and speed characteristics (Fast Recovery ≤ 500ns) remain equivalent. Forward voltage is slightly elevated (540 mV @ 2A versus 500 mV @ 2A), resulting in marginally increased power dissipation. Reverse leakage (200 µA @ 30V) falls between the SS22FA and SS2020FL_R1_00001. Operating temperature range (-55°C ~ 150°C) matches the SS22FA lower bound and extends the upper limit. Product status is Active with established supply availability. Package footprint differs significantly (DO-219AB versus SOD-123W), requiring PCB redesign. RoHS3 compliance is maintained. This substitute is appropriate for applications requiring higher voltage margin and thermal performance, with tolerance for package redesign.

Frequently Asked Questions (FAQ)

Q: Can the SS2020FL_R1_00001 directly replace the SS22FA without PCB modification?

A: Electrical substitution is valid; however, package compatibility requires assessment. The SS22FA uses SOD-123W packaging while the SS2020FL_R1_00001 uses SOD-123F packaging. Both are SOD-123 variants with similar footprints but may have minor dimensional differences. PCB layout verification is necessary to confirm pad alignment and thermal performance.

Q: What is the significance of the 30V rating on the SS2FL3-M3/H compared to the 20V SS22FA?

A: The elevated voltage rating provides additional design margin for transient overvoltage events and reverse voltage spikes. This does not affect forward operation in circuits designed for 20V operation. The higher rating allows use in applications with greater voltage stress without component degradation.

Q: Why does the SS2020FL_R1_00001 show lower reverse leakage current than the SS22FA?

A: Reverse leakage current (400 µA @ 20V for SS22FA versus 100 µA @ 20V for SS2020FL_R1_00001) reflects manufacturing process differences between onsemi and Panjit. Lower leakage reduces standby power consumption and heat generation in idle states. Both values remain within acceptable ranges for Schottky diode applications.

Q: Is the SS2FL3-M3/H suitable for automotive applications requiring AEC-Q101 qualification?

A: The SS2FL3-M3/H does not carry explicit AEC-Q101 qualification in the provided specifications. Applications requiring automotive qualification should confirm qualification status with Vishay directly or select the SS22FA if AEC-Q101 certification is mandatory.

Q: What is the impact of the forward voltage difference between SS22FA (500 mV) and SS2FL3-M3/H (540 mV)?

A: The 40 mV difference results in increased power dissipation in the diode. For a 2A load, this represents approximately 80 mW additional heat generation. Circuit thermal design must accommodate this increase. For low-power applications, this difference is negligible; for high-current or thermally constrained designs, this factor requires evaluation.

Q: Can both substitute parts be used interchangeably in the same design?

A: No. The SS2020FL_R1_00001 and SS2FL3-M3/H have different voltage ratings, package footprints, and electrical characteristics. Selection depends on specific circuit requirements. The SS2020FL_R1_00001 is preferred for direct electrical replacement; the SS2FL3-M3/H is preferred for applications requiring higher voltage margin and extended temperature range.

Q: What is the Moisture Sensitivity Level (MSL) for these diodes?

A: All three parts (SS22FA, SS2020FL_R1_00001, and SS2FL3-M3/H) carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard surface mount assembly processes are applicable without special moisture control measures.

Q: Are all three parts RoHS3 compliant?

A: Yes. The SS22FA, SS2020FL_R1_00001, and SS2FL3-M3/H are all ROHS3 compliant, meeting lead-free and restricted substance requirements for EU and global markets.

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