S2A R5G Equivalent & Substitute Parts

Part Overview

The S2A R5G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design and procurement requirements. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional compatibility within defined parameter tolerances for 50 V, 2 A rectifier applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.15 V @ 2 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	1	µA @ 50 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S2A R5G is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 2 A
Package / Case: DO-214AA (SMB) surface mount
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C minimum

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: ≤ 1.15 V @ 2 A
Reverse Recovery Time (trr): ≤ 1.5 µs (standard recovery)
Current - Reverse Leakage @ Vr: ≤ 1 µA @ 50 V
RoHS3 Compliance

Parts are classified as Parametric Equivalent when all primary and secondary criteria are met with identical specifications. Parts are classified as Similar when primary criteria are met but secondary parameters differ within acceptable engineering tolerances for general-purpose rectification applications.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs/ns]	Ir @ Vr [µA]	Package	Product Status
S2A R5G	Taiwan Semiconductor Corporation	50	2	1.15 @ 2 A	1.5 µs	1 @ 50 V	DO-214AA (SMB)	Discontinued
S2A	Diotec Semiconductor	50	2	1.15 @ 2 A	1.5 µs	5 @ 50 V	DO-214AA (SMB)	Active
S2AH	Taiwan Semiconductor Corporation	50	2	1.15 @ 2 A	1.5 µs	1 @ 50 V	DO-214AA (SMB)	Active
CGRB201-G	Comchip Technology	50	2	1.1 @ 2 A	1.5 µs	5 @ 50 V	DO-214AA (SMB)	Active
ES2A-13-F	Diodes Incorporated	50	2	0.92 @ 2 A	25 ns	5 @ 50 V	DO-214AA (SMB)	Active
ES2AHE3_A/H	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2 A	20 ns	10 @ 50 V	DO-214AA (SMB)	Active
ES2AHE3_A/I	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2 A	20 ns	10 @ 50 V	DO-214AA (SMB)	Active
ES2AHM3/5BT	Vishay General Semiconductor - Diodes Division	50	2	0.9 @ 2 A	30 ns	10 @ 50 V	DO-214AA (SMB)	Active

Engineering Selection Recommendations

Parametric Equivalent Selection:

The S2AH (Taiwan Semiconductor Corporation) is the primary parametric equivalent. It maintains identical electrical specifications to the S2A R5G, including 50 V reverse voltage, 2 A average rectified current, 1.15 V forward voltage at 2 A, 1.5 µs reverse recovery time, and 1 µA reverse leakage current at 50 V. The S2AH is AEC-Q101 qualified for automotive applications and carries active product status with 864 units in stock. This part is suitable for direct substitution in all applications where the S2A R5G was specified.

The S2A (Diotec Semiconductor) is a parametric equivalent with identical electrical performance except for reverse leakage current (5 µA versus 1 µA). This part is active with 7004 units in stock and is suitable for general-purpose rectification applications where the higher leakage specification is acceptable.

Similar Part Selection:

The CGRB201-G (Comchip Technology) meets all primary substitution criteria with 50 V reverse voltage and 2 A current rating in DO-214AA package. Forward voltage is 1.1 V at 2 A, which is lower than the S2A R5G specification. This part is active with 20272 units in stock and is suitable for applications where lower forward voltage drop is beneficial.

The ES2A-13-F, ES2AHE3_A/H, ES2AHE3_A/I, and ES2AHM3/5BT (Diodes Incorporated and Vishay) are fast recovery variants with reverse recovery times of 20–25 ns compared to the 1.5 µs standard recovery specification of the S2A R5G. These parts are suitable for applications requiring faster switching characteristics. The Vishay ES2AHE3 variants are AEC-Q101 qualified for automotive use.

All recommended substitutes are RoHS3 compliant and operate across the -55°C to 150°C junction temperature range.

Frequently Asked Questions (FAQ)

Q: Can the S2A R5G be directly replaced with the S2AH?

A: Yes. The S2AH is a parametric equivalent with identical voltage, current, forward voltage, and recovery time specifications. Both parts are rated for 50 V, 2 A, and use the DO-214AA (SMB) package. The S2AH is currently active and available in stock.

Q: What is the difference between standard recovery and fast recovery diodes in this product category?

A: The S2A R5G uses standard recovery technology with a reverse recovery time of 1.5 µs. Fast recovery variants such as ES2A-13-F and ES2AHE3 series have reverse recovery times of 20–25 ns. Fast recovery diodes switch more quickly, reducing switching losses in high-frequency applications. Standard recovery diodes are suitable for lower-frequency rectification applications.

Q: Are all substitute parts available in the same DO-214AA (SMB) package?

A: Yes. All recommended substitute parts are available in the DO-214AA (SMB) surface mount package, ensuring mechanical and thermal compatibility with the original S2A R5G footprint.

Q: What does AEC-Q101 qualification mean?

A: AEC-Q101 is an automotive electronics qualification standard. Parts carrying this qualification, such as the S2AH and ES2AHE3 variants, have been tested and approved for use in automotive applications. These parts are suitable for both automotive and general industrial applications.

Q: Can I use the CGRB301-G (3 A rated) as a substitute for the S2A R5G (2 A rated)?

A: The CGRB301-G is rated for 3 A average rectified current, which exceeds the 2 A specification of the S2A R5G. While the higher current rating provides additional margin, this part is not a direct equivalent. Use only if the application circuit design accommodates the different current rating and thermal characteristics.

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

A: Reverse leakage current (Ir) represents the small current that flows through the diode in the reverse-biased state. The S2A R5G specifies 1 µA at 50 V. Substitute parts with higher leakage specifications (5–10 µA) are acceptable for general-purpose rectification but may result in slightly higher power dissipation in high-impedance circuits. For precision applications, select substitutes with leakage specifications matching or lower than the original part.

Q: Is the S2A from Diotec Semiconductor suitable for automotive applications?

A: The Diotec S2A is not AEC-Q101 qualified. For automotive applications, use the S2AH (Taiwan Semiconductor Corporation) or ES2AHE3 variants (Vishay), which carry AEC-Q101 qualification.

Q: What packaging format should I specify when ordering substitute parts?

A: The S2A R5G was supplied in Cut Tape (CT) packaging. Substitute parts are available in Tape & Reel (TR) or Cut Tape formats depending on the manufacturer and distributor. Verify packaging format with your supplier to ensure compatibility with your assembly process.

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