SS24L Equivalent & Substitute Parts

Part Overview

The SS24L is a 2A, 40V Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, housed in a SOD-123 surface mount package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The part is supplied in Tape & Reel packaging and maintains full RoHS3 compliance. Due to its discontinued design status, equivalent substitute parts with active product status are available to support ongoing production requirements and design transitions.

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
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution eligibility for the SS24L is determined by strict electrical and mechanical parameter matching within the Schottky rectifier diode category. All substitute parts must satisfy the following core criteria:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 2 A
Technology: Schottky
Mounting Type: Surface Mount
Operating Temperature Range: Minimum -55°C to +125°C
RoHS3 Compliance

Allowable Variations:

Package / Case: SOD-123, SOD-123W, or SOD-123H variants (all surface mount, pin-compatible within design constraints)
Voltage - Forward (Vf) (Max) @ If: Up to 550 mV @ 2 A (within acceptable forward voltage tolerance)
Current - Reverse Leakage @ Vr: Up to 400 µA @ 40 V (lower values acceptable)
Product Status: Active products preferred for ongoing supply assurance

The SS24L has two qualified substitutes: SS24LW (Taiwan Semiconductor Corporation, SOD-123W package, active status) and SS2040HE_R1_00001 (Panjit International Inc., SOD-123HE package, active status). Both meet all mandatory electrical parameters and compliance requirements.

Parameter Comparison

Parameter	SS24L (Main)	SS24LW (Substitute)	SS2040HE_R1_00001 (Substitute)
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Panjit International Inc.
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V
Current - Average Rectified (Io)	2 A	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A	550 mV @ 2 A	550 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	400 µA @ 40 V	200 µA @ 40 V	100 µA @ 40 V
Operating Temperature - Junction	-55°C to 125°C	-55°C to 125°C	-55°C to 150°C
Technology	Schottky	Schottky	Schottky
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123	SOD-123W	SOD-123H
Product Status	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

SS24LW (Taiwan Semiconductor Corporation): This part is the manufacturer-recommended substitute for the SS24L. It maintains identical electrical ratings (40 V, 2 A) and operating temperature range (-55°C to 125°C). The forward voltage increases from 500 mV to 550 mV, which remains within acceptable tolerance for most applications. Reverse leakage current is improved at 200 µA versus 400 µA. The primary difference is the package variant (SOD-123W versus SOD-123), which requires PCB layout verification for footprint compatibility. Active product status ensures long-term supply availability. RoHS3 and REACH compliance are maintained.

SS2040HE_R1_00001 (Panjit International Inc.): This alternative substitute meets all mandatory electrical parameters with superior reverse leakage performance (100 µA @ 40 V). The operating temperature range extends to 150°C, providing additional thermal margin. The SOD-123H package variant requires PCB footprint validation. Active product status from a qualified manufacturer ensures supply continuity. RoHS3 and REACH compliance are maintained. This option is suitable when lower leakage current or extended temperature operation is beneficial to circuit performance.

Both substitutes are electrically and mechanically compatible with the SS24L within the constraints of package footprint differences. Selection between SS24LW and SS2040HE_R1_00001 depends on PCB layout constraints, preferred supplier relationship, and specific application requirements for leakage current or operating temperature.

Frequently Asked Questions (FAQ)

Q: Can the SS24LW directly replace the SS24L without PCB modifications?

A: The SS24LW is electrically equivalent to the SS24L across all critical parameters (40 V, 2 A, Schottky technology, -55°C to 125°C). However, the package differs (SOD-123W versus SOD-123). PCB footprint compatibility must be verified before implementation. If the PCB is designed for SOD-123, the SOD-123W package may not fit without layout changes.

Q: What is the significance of the forward voltage difference between SS24L (500 mV) and the substitutes (550 mV)?

A: The 50 mV increase in forward voltage (Vf) from 500 mV to 550 mV represents a 10% change. For most rectifier applications, this variation is within acceptable design tolerance. Circuit designers should verify that the increased forward voltage does not adversely affect voltage regulation, efficiency, or thermal performance in the specific application.

Q: Why does the SS2040HE_R1_00001 have lower reverse leakage current (100 µA) compared to the SS24L (400 µA)?

A: Reverse leakage current is a function of semiconductor manufacturing process and die design. The SS2040HE_R1_00001, manufactured by Panjit International Inc., exhibits superior leakage characteristics. Lower reverse leakage reduces standby power consumption and heat generation, which can be advantageous in battery-powered or thermally constrained applications.

Q: Is the extended temperature range of the SS2040HE_R1_00001 (-55°C to 150°C versus -55°C to 125°C) a significant advantage?

A: The extended upper temperature limit of 150°C provides additional thermal margin for applications operating in high-temperature environments or with limited thermal management. If the application operates within -55°C to 125°C, both parts are functionally equivalent. Extended temperature capability is beneficial only if the circuit design or operating environment requires it.

Q: Are all three parts (SS24L, SS24LW, SS2040HE_R1_00001) RoHS3 and REACH compliant?

A: Yes. All three parts are RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components in most jurisdictions.

Q: What packaging formats are available for these Schottky rectifier diodes?

A: The SS24L is supplied in Tape & Reel (TR) format. The SS24LW is available in Cut Tape (CT) and Digi-Reel® packaging. The SS2040HE_R1_00001 is supplied in Tape & Reel (TR) format. Packaging format selection depends on production volume, assembly equipment compatibility, and inventory management requirements.

Q: Why is the SS24L marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status and is no longer recommended for new product development. Existing inventory remains available for legacy product support. New designs should utilize active products such as SS24LW or SS2040HE_R1_00001 to ensure long-term supply assurance and manufacturer support.

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