S2A/54 Equivalent & Substitute Parts

Part Overview

The S2A/54 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 50 V DC reverse voltage and 1.5 A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as Active product status and utilizes standard recovery technology. The S2A/54 is RoHS non-compliant, which may necessitate identification of compliant alternatives for applications subject to regulatory requirements or procurement restrictions.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.15 @ 1.5 A	V
Reverse Recovery Time (trr)	2	µs
Current - Reverse Leakage @ Vr	1	µA @ 50 V
Capacitance @ Vr, F	16	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution of the S2A/54 is determined by equivalence in the following critical parameters: voltage rating (50 V DC reverse), current rating (1.5 A average rectified), forward voltage characteristics, package type (DO-214AA/SMB surface mount), and recovery speed classification (standard recovery). Parts meeting these electrical and mechanical specifications are classified as direct equivalents or parametric alternatives.

The substitute parts identified fall into the following categories:

Parametric Equivalent (Same Manufacturer, Different Packaging): S2A-E3/52T maintains identical electrical specifications to the S2A/54 while offering RoHS3 compliance and alternative packaging (Cut Tape & Digi-Reel).

Direct Manufacturer Equivalent (Alternative Manufacturer): S2A-13-F (Diodes Incorporated) provides equivalent voltage and current ratings with identical forward voltage and package configuration, with minor variations in reverse leakage current and capacitance.

MFR Recommended Alternatives: RS2A-13-F (Diodes Incorporated) and S2A (Diotec Semiconductor) offer higher current ratings or faster recovery characteristics, suitable for applications requiring enhanced performance within the 50 V rating class.

Parameter Comparison

Parameter	S2A/54 (Main)	S2A-E3/52T	S2A-13-F	RS2A-13-F	S2A (Diotec)
Manufacturer	Vishay General Semiconductor	Vishay General Semiconductor	Diodes Incorporated	Diodes Incorporated	Diotec Semiconductor
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	1.5 A	1.5 A	1.5 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 1.5 A	1.15 V @ 1.5 A	1.15 V @ 1.5 A	1.3 V @ 1.5 A	1.15 V @ 2 A
Reverse Recovery Time (trr)	2 µs	2 µs	Not specified	150 ns	1.5 µs
Current - Reverse Leakage @ Vr	1 µA @ 50 V	1 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	16 pF @ 4V, 1MHz	16 pF @ 4V, 1MHz	20 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	Not specified
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AC, SMA	DO-214AA, SMB
Operating Temperature - Junction	-55 to 150 °C	-55 to 150 °C	-65 to 150 °C	-65 to 150 °C	-50 to 150 °C
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For RoHS3 Compliance Requirement: S2A-E3/52T is the direct parametric equivalent with identical electrical specifications and RoHS3 compliance certification. This part maintains the same voltage, current, forward voltage, and recovery characteristics as the S2A/54 while satisfying regulatory compliance mandates.

For Alternative Manufacturer Sourcing: S2A-13-F (Diodes Incorporated) provides equivalent performance with RoHS3 compliance. This part matches the primary electrical parameters and package configuration. The reverse leakage current is specified at 5 µA compared to 1 µA for the S2A/54; this difference is within acceptable tolerance for general-purpose rectification applications.

For Enhanced Performance (Faster Recovery): RS2A-13-F offers fast recovery characteristics (150 ns trr) compared to standard recovery (2 µs) of the S2A/54. This part is suitable for applications requiring reduced switching losses. Note that RS2A-13-F uses DO-214AC (SMA) package rather than DO-214AA (SMB), requiring PCB layout verification for mechanical compatibility.

For Higher Current Rating: S2A (Diotec Semiconductor) provides 2 A average rectified current rating while maintaining 50 V voltage rating and identical forward voltage at its rated current. This part is suitable for applications requiring current margin above 1.5 A. Operating temperature range is -50 to 150 °C, which is narrower than the S2A/54 at the lower end.

For Inventory Availability: S2A-E3/52T offers the highest inventory level (40,400 pcs) among substitute options, followed by S2A-13-F (30,620 pcs).

Frequently Asked Questions (FAQ)

Q: Can S2A-E3/52T be used as a direct replacement for S2A/54?

A: Yes. S2A-E3/52T is a parametric equivalent with identical voltage (50 V), current (1.5 A), forward voltage (1.15 V @ 1.5 A), reverse recovery time (2 µs), and capacitance (16 pF @ 4V, 1MHz) specifications. The primary difference is RoHS3 compliance and packaging format (Cut Tape & Digi-Reel vs. bulk). Both use DO-214AA (SMB) package.

Q: What is the difference between S2A-13-F and S2A/54?

A: S2A-13-F matches the S2A/54 in voltage (50 V), current (1.5 A), forward voltage (1.15 V @ 1.5 A), and package (DO-214AA, SMB). Differences include: reverse leakage current (5 µA vs. 1 µA), capacitance (20 pF vs. 16 pF), operating temperature range (-65 to 150 °C vs. -55 to 150 °C), and RoHS3 compliance. The manufacturer is Diodes Incorporated rather than Vishay.

Q: Why does RS2A-13-F have a different package designation (SMA vs. SMB)?

A: RS2A-13-F uses DO-214AC (SMA) package, which is physically different from the DO-214AA (SMB) package of the S2A/54. While both are surface mount packages, SMA is smaller than SMB. PCB footprint compatibility must be verified before substitution. RS2A-13-F offers fast recovery (150 ns) compared to standard recovery (2 µs) of the S2A/54.

Q: Can S2A (Diotec) be substituted for S2A/54 in all applications?

A: S2A (Diotec) provides higher current rating (2 A vs. 1.5 A) and faster recovery (1.5 µs vs. 2 µs) while maintaining 50 V voltage rating and identical forward voltage at its rated current. The operating temperature range is -50 to 150 °C, which is 5 °C narrower at the lower end than the S2A/54. Substitution is suitable for applications not requiring operation below -50 °C.

Q: What is the significance of reverse leakage current differences between parts?

A: S2A/54 specifies 1 µA reverse leakage at 50 V, while S2A-13-F and RS2A-13-F specify 5 µA. Lower reverse leakage reduces standby current and heat dissipation in blocking mode. For general-purpose rectification, both specifications are acceptable. Applications with stringent leakage requirements should retain the S2A/54 or S2A-E3/52T.

Q: Are all substitute parts RoHS3 compliant?

A: S2A-E3/52T, S2A-13-F, RS2A-13-F, and S2A (Diotec) are all RoHS3 compliant. The original S2A/54 is RoHS non-compliant. For procurement subject to RoHS requirements, any of the four substitute parts satisfy regulatory mandates.

Q: What is the inventory status of substitute parts?

A: S2A-E3/52T has 40,400 pcs in stock, S2A-13-F has 30,620 pcs, S2A (Diotec) has 7,004 pcs, and RS2A-13-F has 6,300 pcs. The original S2A/54 has 976 pcs in stock.

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