SS24L RHG Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS24L RHG is an active Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, designed for surface mount applications in the Sub SMA package format. This component operates at 40V DC reverse voltage with a 2A average rectified current rating and features fast recovery characteristics suitable for high-frequency switching applications. The part is ROHS3 compliant and maintains unlimited moisture sensitivity classification.

Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and component availability options while maintaining electrical and mechanical compatibility within specified parameter tolerances.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	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 @ 40 V
Technology	Schottky	—
Package / Case	DO-219AB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS24L RHG is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40V
Package / Case: DO-219AB
Mounting Type: Surface Mount
Technology: Schottky
Operating Temperature Range: -55°C to 150°C
RoHS Status: ROHS3 Compliant

Allowable Parameter Variance:

Current - Average Rectified (Io): Substitute parts must equal or exceed the 2A requirement
Voltage - Forward (Vf) (Max): Substitute parts must not exceed 500 mV @ rated current
Current - Reverse Leakage @ Vr: Substitute parts must not exceed 400 µA @ 40V
Speed: Substitute parts must maintain Fast Recovery ≤ 500ns, > 200mA (Io)

The SS1FL4HM3/H meets the mandatory matching parameters and operates within allowable variance limits for reverse leakage and forward voltage characteristics.

Parameter Comparison

Parameter	SS24L RHG (Main Part)	SS1FL4HM3/H (Substitute)	Compatibility
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	Different manufacturer
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	Matched
Current - Average Rectified (Io)	2 A	1 A	Substitute rated lower
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	500 mV @ 1 A	Matched at respective currents
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Matched
Current - Reverse Leakage @ Vr	400 µA @ 40 V	200 µA @ 40 V	Substitute superior
Package / Case	DO-219AB	DO-219AB	Matched
Mounting Type	Surface Mount	Surface Mount	Matched
Operating Temperature - Junction	-55°C to 150°C	-55°C to 150°C	Matched
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Matched
Qualification	—	AEC-Q101	Substitute includes automotive qualification

Engineering Selection Recommendations

SS1FL4HM3/H Substitution Criteria:

The SS1FL4HM3/H is electrically and mechanically compatible with the SS24L RHG for applications where the circuit design accommodates a 1A average rectified current rating. Both components share identical reverse voltage specifications (40V), package format (DO-219AB), mounting configuration (Surface Mount), and operating temperature range (-55°C to 150°C).

The SS1FL4HM3/H demonstrates superior reverse leakage performance at 200 µA compared to the SS24L RHG at 400 µA, both measured at 40V. Forward voltage characteristics remain equivalent at 500 mV across their respective rated currents.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity classification (MSL 1). The SS1FL4HM3/H carries AEC-Q101 automotive qualification, indicating additional reliability screening and qualification testing per automotive standards.

Substitution is valid only in circuit designs where the maximum average rectified current requirement does not exceed 1A. Applications requiring the full 2A capability of the SS24L RHG cannot use the SS1FL4HM3/H as a direct substitute.

Frequently Asked Questions (FAQ)

Q: Can the SS1FL4HM3/H replace the SS24L RHG in all applications?

A: No. The SS1FL4HM3/H is rated for 1A average rectified current, while the SS24L RHG is rated for 2A. Substitution is valid only in circuits where the maximum average rectified current requirement does not exceed 1A. Exceeding this current rating will cause component failure.

Q: Are the package formats identical between these parts?

A: Yes. Both the SS24L RHG and SS1FL4HM3/H use the DO-219AB package format for surface mount applications. PCB footprints and reflow soldering profiles are compatible.

Q: What is the difference in reverse leakage current between these parts?

A: The SS24L RHG specifies 400 µA reverse leakage at 40V, while the SS1FL4HM3/H specifies 200 µA at 40V. The SS1FL4HM3/H exhibits lower reverse leakage, which may provide improved performance in low-power or precision applications.

Q: Do both parts meet the same compliance standards?

A: Both parts are ROHS3 compliant and REACH unaffected. The SS1FL4HM3/H additionally carries AEC-Q101 automotive qualification, indicating it has undergone automotive-grade reliability testing and screening.

Q: What is the forward voltage drop at the rated current for each part?

A: Both parts specify a maximum forward voltage of 500 mV at their respective rated currents: the SS24L RHG at 2A and the SS1FL4HM3/H at 1A. Forward voltage characteristics are equivalent within their operating ranges.

Q: Are the operating temperature ranges the same?

A: Yes. Both the SS24L RHG and SS1FL4HM3/H operate across a junction temperature range of -55°C to 150°C.

Q: What is the recovery speed classification for these Schottky diodes?

A: Both parts are classified as Fast Recovery with a maximum recovery time of 500 nanoseconds for currents exceeding 200 mA. This specification applies to both components.

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