SS24FL Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS24FL is a 40V, 2A Schottky rectifier diode manufactured by onsemi in SOD-123F surface mount packaging. This component is classified as Not For New Designs, indicating it has been superseded in onsemi's product portfolio. Equivalent and substitute parts are necessary for applications requiring continued sourcing, design flexibility, or performance optimization within the 40V/2A Schottky diode category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Reverse Recovery Time (trr)	9.495	ns
Current - Reverse Leakage @ Vr	100	µA @ 40 V
Mounting Type	Surface Mount	—
Package / Case	SOD-123F	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SS24FL is determined by matching the following critical parameters:

Voltage Rating: 40V DC reverse voltage (Vr) maximum
Current Rating: 2A average rectified current (Io)
Technology: Schottky rectifier diode
Mounting: Surface mount configuration
Package Compatibility: SOD-123F or equivalent footprint (SOD-123FL, PMDU, DO-219AB)
Speed Classification: Fast recovery ≤ 500ns for > 200mA
Compliance: ROHS3 compliant, MSL 1

Substitute parts are grouped into two categories:

Category A - Direct Equivalents (40V/2A): Parts with identical voltage and current ratings, suitable for direct replacement with minimal circuit impact.

Category B - Parametric Equivalents (40V/1A or alternative packages): Parts with reduced current ratings or different package geometries that require circuit-level evaluation for compatibility.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Product Status	Tj (Max)
SS24FL	onsemi	40 V	2 A	550 mV @ 2 A	100 µA @ 40 V	SOD-123F	Not For New Designs	125°C
RB060MM-40TR	Rohm Semiconductor	40 V	2 A	560 mV @ 2 A	500 µA @ 40 V	SOD-123F	Active	150°C
RB068MM-40TR	Rohm Semiconductor	40 V	2 A	725 mV @ 2 A	550 nA @ 40 V	SOD-123F	Active	150°C
RB160MM-40TR	Rohm Semiconductor	40 V	1 A	510 mV @ 1 A	30 µA @ 40 V	SOD-123F	Active	150°C
RB160MM-50TR	Rohm Semiconductor	40 V	1 A	510 mV @ 1 A	30 µA @ 40 V	SOD-123F	Active	150°C
RB162MM-40TR	Rohm Semiconductor	40 V	1 A	550 mV @ 1 A	100 µA @ 40 V	SOD-123F	Active	150°C
RB168MM-40TR	Rohm Semiconductor	40 V	1 A	650 mV @ 1 A	550 nA @ 40 V	SOD-123F	Active	175°C
RBR2MM40BTR	Rohm Semiconductor	40 V	2 A	560 mV @ 2 A	80 µA @ 40 V	SOD-123F	Active	150°C
SS2040FL_R1_00001	Panjit International Inc.	40 V	2 A	500 mV @ 2 A	100 µA @ 40 V	SOD-123F	Active	150°C
SS2FL4-M3/H	Vishay General Semiconductor - Diodes Division	40 V	2 A	580 mV @ 2 A	220 µA @ 40 V	DO-219AB	Active	150°C
DSK24	MDD	40 V	2 A	550 mV @ 2 A	500 µA @ 40 V	SOD-123F	Active	125°C

Engineering Selection Recommendations

Direct Replacement Candidates (40V/2A, SOD-123F Package)

The following parts are electrically and mechanically compatible with the SS24FL and maintain identical voltage and current specifications:

SS2040FL_R1_00001 (Panjit International Inc.): Active product status with superior forward voltage performance (500 mV @ 2A vs. 550 mV). Operating temperature range extends to 150°C. ROHS3 compliant with MSL 1.
RB060MM-40TR (Rohm Semiconductor): Active product with forward voltage of 560 mV @ 2A and extended junction temperature to 150°C. Higher reverse leakage (500 µA) compared to SS24FL. ROHS3 compliant with MSL 1.
RBR2MM40BTR (Rohm Semiconductor): Active product with 2A rating and 40V voltage specification. Forward voltage 560 mV @ 2A with lower reverse leakage (80 µA) than RB060MM-40TR. Junction temperature rated to 150°C. ROHS3 compliant with MSL 1.

Alternative Package Option (40V/2A, DO-219AB Package)

SS2FL4-M3/H (Vishay General Semiconductor - Diodes Division): Active eSMP® series product with 40V/2A rating. Package geometry differs (DO-219AB vs. SOD-123F), requiring PCB layout modification. Forward voltage 580 mV @ 2A. Junction temperature to 150°C. ROHS3 compliant with MSL 1.

Reduced Current Alternatives (40V/1A, SOD-123F Package)

The following parts are suitable only for applications where the circuit current requirement does not exceed 1A:

RB160MM-40TR and RB160MM-50TR (Rohm Semiconductor): Identical specifications with 1A current rating. Forward voltage 510 mV @ 1A with low reverse leakage (30 µA). Junction temperature to 150°C. ROHS3 compliant with MSL 1.
RB162MM-40TR (Rohm Semiconductor): 1A current rating with forward voltage 550 mV @ 1A and reverse leakage 100 µA. Junction temperature to 150°C. ROHS3 compliant with MSL 1.
RB168MM-40TR (Rohm Semiconductor): 1A current rating with forward voltage 650 mV @ 1A and extremely low reverse leakage (550 nA). Highest junction temperature rating at 175°C. ROHS3 compliant with MSL 1.

Parametric Equivalent (40V/2A, Alternative Supplier)

DSK24 (MDD): 40V/2A rating with forward voltage 550 mV @ 2A. Junction temperature matches SS24FL at 125°C. ROHS3 compliant with MSL 1. Note: HTSUS code differs (8542.39.0001 vs. 8541.10.0080).

All substitute parts listed maintain ROHS3 compliance and MSL 1 moisture sensitivity classification. All parts are classified as Fast Recovery Schottky diodes with recovery time ≤ 500ns for currents > 200mA.

Frequently Asked Questions (FAQ)

Q: Can RB160MM-40TR or other 1A-rated parts replace the SS24FL in my circuit?

A: RB160MM-40TR and similar 1A-rated Schottky diodes are suitable only if your circuit's maximum forward current does not exceed 1A. The SS24FL is rated for 2A average rectified current. Using a 1A-rated part in a 2A application will result in component failure or thermal stress.

Q: What is the difference between SOD-123F and DO-219AB packages?

A: SOD-123F and DO-219AB are different surface mount package geometries with different footprints and land patterns. SS2FL4-M3/H uses DO-219AB (SMF) packaging, while SS24FL uses SOD-123F. Direct PCB substitution is not possible without layout modification. Verify your PCB design supports the alternative package before selection.

Q: Why do some substitute parts have higher reverse leakage current?

A: Reverse leakage current varies by manufacturer and device design. RB060MM-40TR specifies 500 µA @ 40V compared to SS24FL's 100 µA @ 40V. Higher reverse leakage increases standby power dissipation but does not affect forward conduction performance. Evaluate circuit power budget requirements before selection.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the SS24FL compliance profile.

Q: What is the significance of the extended junction temperature ratings on substitute parts?

A: Many substitute parts specify maximum junction temperatures of 150°C or higher, compared to SS24FL's 125°C maximum. Higher temperature ratings provide additional thermal margin in high-ambient or high-power applications but do not alter electrical performance at standard operating conditions.

Q: Can I use SS2040FL_R1_00001 as a direct replacement for SS24FL?

A: Yes. SS2040FL_R1_00001 is a direct electrical and mechanical equivalent with identical 40V/2A ratings and SOD-123F packaging. It offers superior forward voltage performance (500 mV vs. 550 mV @ 2A) and extended junction temperature to 150°C. Both parts are ROHS3 compliant with MSL 1.

Q: What does "Not For New Designs" status mean for SS24FL?

A: This designation indicates that onsemi has discontinued the SS24FL for new product development. Existing inventory remains available, but the manufacturer recommends using active alternative products for new designs. All substitute parts listed carry Active product status.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage (Vf) determines the voltage drop across the diode during conduction. SS24FL specifies 550 mV @ 2A, while SS2040FL_R1_00001 specifies 500 mV @ 2A. Lower forward voltage reduces power dissipation and heat generation. Differences of 50-100 mV are typically acceptable in rectifier applications but should be verified in precision analog circuits.

Q: Is the DSK24 from MDD a suitable alternative?

A: DSK24 is a parametric equivalent with matching 40V/2A ratings and 550 mV forward voltage. However, it maintains the same 125°C junction temperature as SS24FL (lower than most active alternatives) and carries a different HTSUS classification. It is suitable for direct replacement if supply chain or cost considerations favor this option.

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