SS24/1 Schottky Diode 40V 2A Equivalent & Substitute Parts

Part Overview

The SS24/1 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 40V DC reverse voltage and 2A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as an active product and is RoHS non-compliant. Equivalent and substitute parts are necessary to address supply chain requirements, alternative sourcing options, package preferences, or specific compliance mandates in production environments.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	400 µA @ 40 V
Mounting Type	Surface Mount
Package / Case	DO-214AA, SMB
Operating Temperature - Junction	-65°C ~ 125°C
Technology	Schottky

Substitute Part Grouping Explanation

Substitution of the SS24/1 is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 40 V
Current - Average Rectified (Io): 2 A minimum
Technology: Schottky
Mounting Type: Surface Mount
Package compatibility: DO-214AA (SMB) or equivalent surface mount packages

Allowable Variations:

Forward voltage (Vf) within typical Schottky diode range (430 mV to 550 mV @ rated current)
Reverse leakage current (90 µA to 500 µA @ 40 V)
Operating temperature range (minimum -55°C to maximum 150°C acceptable)
RoHS compliance status (ROHS3 compliant substitutes are acceptable)

Substitute parts are grouped into two categories: Direct Equivalents (identical 2A rating and DO-214AA package) and Functional Alternatives (higher current ratings or different package formats that maintain electrical compatibility).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Ir @ Vr	Package	Temp Range	RoHS Status
SS24/1	Vishay	40 V	2	500 mV @ 2 A	400 µA @ 40 V	DO-214AA	-65°C ~ 125°C	Non-compliant
PMEG4020EP,115	NXP Semiconductors	40 V	2	490 mV @ 2 A	100 µA @ 40 V	SOD-128	-40°C ~ 150°C	ROHS3 Compliant
B240-13-F	Diodes Incorporated	40 V	2	500 mV @ 2 A	500 µA @ 40 V	DO-214AA	-65°C ~ 150°C	ROHS3 Compliant
CDBB240-G	Comchip Technology	40 V	2	500 mV @ 2 A	500 µA @ 40 V	DO-214AA	-55°C ~ 125°C	ROHS3 Compliant
SK24_R1_00001	Panjit International Inc.	40 V	2	500 mV @ 2 A	90 µA @ 40 V	DO-214AA	-55°C ~ 150°C	ROHS3 Compliant
SK34B-LTP	Micro Commercial Co	40 V	3	500 mV @ 3 A	500 µA @ 40 V	DO-214AA	-55°C ~ 150°C	ROHS3 Compliant
STPS140U	STMicroelectronics	40 V	1	550 mV @ 1 A	12 µA @ 40 V	DO-214AA	-40°C ~ 150°C	ROHS3 Compliant
STPS1L40U	STMicroelectronics	40 V	1	500 mV @ 1 A	35 µA @ 40 V	DO-214AA	-40°C ~ 150°C	ROHS3 Compliant
STPS1L40UY	STMicroelectronics	40 V	1	500 mV @ 1 A	35 µA @ 40 V	DO-214AA	-40°C ~ 150°C	ROHS3 Compliant
STPS2L40U	STMicroelectronics	40 V	2	430 mV @ 2 A	220 µA @ 40 V	DO-214AA	-40°C ~ 150°C	ROHS3 Compliant
STPS340U	STMicroelectronics	40 V	3	630 mV @ 3 A	20 µA @ 40 V	DO-214AA	-40°C ~ 150°C	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (2A Rating, DO-214AA Package):

The following parts provide direct electrical and mechanical compatibility with the SS24/1:

STPS2L40U (STMicroelectronics): Identical 40V/2A rating with superior forward voltage performance (430 mV @ 2 A vs. 500 mV). ROHS3 compliant. Operating temperature range -40°C to 150°C. Suitable for applications requiring lower forward voltage drop and extended high-temperature operation.
B240-13-F (Diodes Incorporated): Identical 40V/2A rating and forward voltage (500 mV @ 2 A). ROHS3 compliant. Operating temperature range -65°C to 150°C. Maintains electrical characteristics of the original part with improved compliance status.
CDBB240-G (Comchip Technology): Identical 40V/2A rating and forward voltage (500 mV @ 2 A). ROHS3 compliant. Operating temperature range -55°C to 125°C. Equivalent performance with ROHS3 compliance.
SK24_R1_00001 (Panjit International Inc.): Identical 40V/2A rating and forward voltage (500 mV @ 2 A). ROHS3 compliant. Operating temperature range -55°C to 150°C. Lowest reverse leakage current (90 µA @ 40 V) among direct equivalents.

Alternative Package Format (2A Rating, Different Package):

PMEG4020EP,115 (NXP Semiconductors): 40V/2A rating in SOD-128 package. ROHS3 compliant. Superior forward voltage (490 mV @ 2 A) and lowest reverse leakage (100 µA @ 40 V). Suitable when SOD-128 package footprint is acceptable and lower leakage is required.

Higher Current Alternatives (3A Rating, DO-214AA Package):

SK34B-LTP (Micro Commercial Co): 40V/3A rating provides current margin above the 2A requirement. ROHS3 compliant. Operating temperature range -55°C to 150°C. Suitable for applications requiring design margin or future current increases.
STPS340U (STMicroelectronics): 40V/3A rating with lowest reverse leakage (20 µA @ 40 V). ROHS3 compliant. Operating temperature range -40°C to 150°C. Recommended for noise-sensitive applications.

Lower Current Alternatives (1A Rating, DO-214AA Package):

The STPS140U, STPS1L40U, and STPS1L40UY are not suitable direct substitutes due to 1A current rating below the 2A requirement of the SS24/1.

Frequently Asked Questions (FAQ)

Q: Can STPS2L40U replace SS24/1 in all applications?

A: STPS2L40U is electrically compatible with SS24/1 for applications operating within -40°C to 150°C. The lower forward voltage (430 mV vs. 500 mV @ 2 A) reduces power dissipation. Verify circuit design does not depend on the original temperature range of -65°C to 125°C.

Q: What is the difference between DO-214AA and SOD-128 packages?

A: Both are surface mount packages for Schottky diodes. DO-214AA (SMB) and SOD-128 have different footprints and land patterns. PMEG4020EP,115 in SOD-128 requires PCB layout modification compared to DO-214AA parts. Verify PCB compatibility before selection.

Q: Why is PMEG4020EP,115 listed as a substitute if it uses a different package?

A: PMEG4020EP,115 meets all electrical requirements (40V/2A Schottky diode) and offers superior performance characteristics (lower forward voltage and reverse leakage). It is included as a functional alternative when package change is feasible during design or redesign phases.

Q: Are 3A-rated parts (SK34B-LTP, STPS340U) safe to use in a 2A circuit?

A: Yes. Higher current-rated diodes are electrically compatible in lower-current applications. The 3A rating provides design margin and typically results in lower junction temperature and improved reliability. No circuit modification is required.

Q: What does ROHS3 compliance mean for the SS24/1 substitution?

A: The original SS24/1 is RoHS non-compliant. All listed substitutes are ROHS3 compliant, meeting Directive 2011/65/EU restrictions on hazardous substances. Selection of ROHS3 compliant parts may be mandatory in applications subject to RoHS regulations.

Q: Can STPS1L40UY be used instead of SS24/1?

A: No. STPS1L40UY is rated for 1A average rectified current, which is below the 2A requirement of SS24/1. Using an undersized diode results in excessive junction temperature and reduced component life.

Q: Which substitute offers the lowest reverse leakage current?

A: STPS340U offers the lowest reverse leakage at 20 µA @ 40 V, followed by SK24_R1_00001 at 90 µA @ 40 V. Lower reverse leakage reduces standby power consumption in battery-powered or low-power applications.

Q: Is the operating temperature range critical for substitution?

A: Yes, if the application operates at the temperature extremes. SS24/1 operates to -65°C; most substitutes operate to -40°C or -55°C minimum. Verify circuit requirements before selecting parts with higher minimum operating temperatures.

Q: What is the advantage of STPS2L40U over B240-13-F?

A: STPS2L40U provides lower forward voltage (430 mV vs. 500 mV @ 2 A), reducing power dissipation by approximately 14%. Both are ROHS3 compliant and rated 40V/2A. Selection depends on thermal design requirements and availability.

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