S2AHR5G Equivalent & Substitute Parts

Part Overview

The S2AHR5G 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 surface mount DO-214AA (SMB) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

The S2AHR5G features automotive-grade qualification (AEC-Q101) with standard recovery characteristics and operates across a junction temperature range of -55°C to 150°C. RoHS3 compliance and unlimited moisture sensitivity level (MSL 1) support broad application deployment.

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
Capacitance @ Vr, F	30	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 150	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S2AHR5G is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 2 A
Package / Case: DO-214AA (SMB)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Allowable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: ≤ 1.15 V @ 2 A
Reverse Recovery Time (trr): ≤ 1.5 µs (standard recovery) or faster
Current - Reverse Leakage @ Vr: ≤ 5 µA @ 50 V
Operating Temperature - Junction: Must encompass -55°C to 150°C or equivalent range
Capacitance @ Vr, F: Variation acceptable within application tolerance

Parts are classified as Parametric Equivalent when all mandatory parameters match exactly. Parts are classified as Similar when voltage and current ratings match but secondary characteristics (recovery time, forward voltage, or package variant) differ within acceptable engineering margins.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	trr	Ir @ Vr	Package	Temp Range	Product Status
S2AHR5G	Taiwan Semiconductor	50 V	2 A	1.15 V @ 2 A	1.5 µs	1 µA @ 50 V	DO-214AA (SMB)	-55 to 150°C	Discontinued
S2A	Diotec Semiconductor	50 V	2 A	1.15 V @ 2 A	1.5 µs	5 µA @ 50 V	DO-214AA (SMB)	-50 to 150°C	Active
S2A R5G	Taiwan Semiconductor	50 V	2 A	1.15 V @ 2 A	1.5 µs	1 µA @ 50 V	DO-214AA (SMB)	-55 to 150°C	Discontinued
S2AH	Taiwan Semiconductor	50 V	2 A	1.15 V @ 2 A	1.5 µs	1 µA @ 50 V	DO-214AA (SMB)	-55 to 150°C	Active
CGRB201-G	Comchip Technology	50 V	2 A	1.1 V @ 2 A	1.5 µs	5 µA @ 50 V	DO-214AA (SMB)	—	Active
CGRB301-G	Comchip Technology	50 V	3 A	1.1 V @ 3 A	1.5 µs	5 µA @ 50 V	DO-214AA (SMB)	—	Active
ES2A-13-F	Diodes Incorporated	50 V	2 A	920 mV @ 2 A	25 ns	5 µA @ 50 V	DO-214AA (SMB)	-55 to 150°C	Active
ES2AA-13-F	Diodes Incorporated	50 V	2 A	920 mV @ 2 A	25 ns	5 µA @ 50 V	DO-214AC (SMA)	-55 to 150°C	Active
RS2A-13-F	Diodes Incorporated	50 V	1.5 A	1.3 V @ 1.5 A	150 ns	5 µA @ 50 V	DO-214AC (SMA)	-65 to 150°C	Active
RS2AA-13-F	Diodes Incorporated	50 V	1.5 A	1.3 V @ 1.5 A	150 ns	5 µA @ 50 V	DO-214AC (SMA)	-65 to 150°C	Active
S2A-13-F	Diodes Incorporated	50 V	1.5 A	1.15 V @ 1.5 A	1.5 µs	5 µA @ 50 V	DO-214AA (SMB)	-65 to 150°C	Active

Engineering Selection Recommendations

Primary Recommendation: S2AH (Taiwan Semiconductor)

The S2AH is the direct parametric equivalent to the S2AHR5G. Both parts share identical electrical specifications: 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. Both are packaged in DO-214AA (SMB) and maintain automotive-grade qualification with AEC-Q101 certification. The S2AH is currently active in production, providing assured long-term availability. Operating temperature range (-55°C to 150°C) and RoHS3 compliance are identical.

Secondary Recommendation: S2A (Diotec Semiconductor)

The S2A from Diotec Semiconductor matches all mandatory parameters: 50 V, 2 A, DO-214AA (SMB) package, and RoHS3 compliance. Electrical performance is equivalent with 1.15 V forward voltage and 1.5 µs recovery time. The reverse leakage current is 5 µA (versus 1 µA in the S2AHR5G), which remains within acceptable engineering margins for general-purpose rectification. Operating temperature range is -50°C to 150°C, which covers the primary operating window. This part is active and widely available.

Tertiary Recommendation: CGRB201-G (Comchip Technology)

The CGRB201-G maintains 50 V, 2 A ratings in DO-214AA (SMB) package with RoHS3 compliance. Forward voltage is 1.1 V at 2 A (lower than the S2AHR5G), and reverse leakage is 5 µA. Recovery time matches at 1.5 µs. This part is active with high inventory availability. Operating temperature maximum is specified as 150°C. Use this part when forward voltage reduction is beneficial to circuit performance.

Alternative for Fast Recovery Applications: ES2A-13-F (Diodes Incorporated)

The ES2A-13-F provides 50 V, 2 A in DO-214AA (SMB) with significantly faster recovery characteristics (25 ns versus 1.5 µs). Forward voltage is reduced to 920 mV at 2 A. This part is suitable for applications requiring fast switching or reduced power dissipation. Operating temperature range (-55°C to 150°C) and RoHS3 compliance match the original specification. Use only when circuit design specifically requires fast recovery diode characteristics.

Not Recommended for Direct Substitution:

ES2AA-13-F: Package is DO-214AC (SMA), not DO-214AA (SMB). PCB layout modification required.
RS2A-13-F, RS2AA-13-F, S2A-13-F: Current rating is 1.5 A, below the 2 A requirement. Suitable only for reduced-current applications.
CGRB301-G: Current rating is 3 A, exceeding the 2 A specification. Use only when higher current capacity is required by circuit design.

Frequently Asked Questions (FAQ)

Q: Can I use S2AH as a direct replacement for S2AHR5G?

A: Yes. The S2AH is a parametric equivalent with identical voltage rating (50 V), current rating (2 A), forward voltage (1.15 V @ 2 A), recovery time (1.5 µs), and package (DO-214AA/SMB). Both maintain automotive-grade qualification and AEC-Q101 certification. The S2AH is currently in active production.

Q: What is the difference between S2AHR5G and S2A R5G?

A: These are variant designations from Taiwan Semiconductor Corporation with identical electrical specifications. Both are rated 50 V, 2 A with 1.15 V forward voltage and 1.5 µs recovery time in DO-214AA (SMB) package. Both are discontinued at DiGi Electronics. The S2AH (without the "R5G" suffix) is the active production equivalent.

Q: Why does the Diotec S2A have 5 µA reverse leakage instead of 1 µA?

A: Reverse leakage current variation within 5 µA at rated voltage is within standard manufacturing tolerance for general-purpose rectifier diodes. For most applications, this difference is negligible. Verify circuit design if leakage current is a critical parameter.

Q: Can I substitute ES2A-13-F for S2AHR5G?

A: Electrical substitution is possible (50 V, 2 A, DO-214AA/SMB package). However, ES2A-13-F is a fast recovery diode (25 ns) versus standard recovery (1.5 µs) in the S2AHR5G. Forward voltage is also lower (920 mV). Use ES2A-13-F only if circuit design specifically requires fast recovery characteristics or benefits from reduced forward voltage drop.

Q: What does "DO-214AA (SMB)" package mean?

A: DO-214AA is the JEDEC package designation for a surface mount diode in SMB (Small Molded Body) form factor. This is a standard 2-pin package with dimensions approximately 4.85 mm × 2.59 mm × 1.6 mm. All recommended substitutes use this identical package unless otherwise noted.

Q: Are all recommended substitutes RoHS3 compliant?

A: Yes. All parametric equivalent and primary similar parts listed are RoHS3 compliant, matching the S2AHR5G specification.

Q: Can I use CGRB301-G (3 A) instead of S2AHR5G (2 A)?

A: CGRB301-G is rated for 3 A average rectified current, exceeding the 2 A requirement. This part can be used if circuit design permits higher current capacity. However, it is not a direct equivalent. Use only when higher current rating is intentional and beneficial to the application.

Q: What is the operating temperature range for substitutes?

A: The S2AHR5G operates from -55°C to 150°C junction temperature. Recommended substitutes maintain this range or extend it. S2A (Diotec) operates -50°C to 150°C, which covers the primary operating window. Verify application requirements if operation below -50°C is necessary.

Q: Is automotive qualification (AEC-Q101) maintained in all substitutes?

A: No. The S2AHR5G and S2AH both carry automotive-grade qualification with AEC-Q101 certification. Other substitutes (Diotec S2A, Comchip CGRB201-G, Diodes ES2A-13-F) do not list automotive qualification. For automotive applications, use S2AH as the primary substitute.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape (CT) is supplied in individual strips for manual handling or small-volume assembly. Tape & Reel (TR) is supplied on continuous reels for automated pick-and-place equipment. Both contain identical components; packaging format differs only for handling and assembly convenience.

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