S2AHM4G Equivalent & Substitute Parts

Part Overview

The S2AHM4G 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 component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs. The device features automotive-grade qualification under AEC-Q101 and operates across a junction temperature range of -55°C to 150°C.

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 S2AHM4G is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Equivalence Criteria:

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

Secondary Compatibility Factors:

Reverse Recovery Time (trr): 1.5 µs (standard recovery classification)
Forward Voltage (Vf): 1.15 V @ 2 A or equivalent
Reverse Leakage Current: ≤ 5 µA @ 50 V
Operating Temperature Range: -55°C to 150°C or wider

Parts are classified into two categories:

Parametric Equivalents: Parts with identical electrical ratings (50 V, 2 A) and matching package specifications, including S2A (Diotec Semiconductor), S2A R5G (Taiwan Semiconductor Corporation), and S2AH (Taiwan Semiconductor Corporation).

Similar Parts: Components with the same voltage and package but differing current ratings (CGRB301-G at 3 A), alternative package formats (ES2AA-13-F in SMA), reduced current ratings (RS2A-13-F and S2A-13-F at 1.5 A), or enhanced recovery characteristics (ES2A-13-F with fast recovery ≤ 500 ns).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status	Grade
S2AHM4G	Taiwan Semiconductor Corporation	50	2	1.15 @ 2 A	1.5	1 @ 50 V	DO-214AA (SMB)	-55 to 150	Discontinued	Automotive
S2A	Diotec Semiconductor	50	2	1.15 @ 2 A	1.5	5 @ 50 V	DO-214AA (SMB)	-50 to 150	Active	—
S2A R5G	Taiwan Semiconductor Corporation	50	2	1.15 @ 2 A	1.5	1 @ 50 V	DO-214AA (SMB)	-55 to 150	Discontinued	—
S2AH	Taiwan Semiconductor Corporation	50	2	1.15 @ 2 A	1.5	1 @ 50 V	DO-214AA (SMB)	-55 to 150	Active	Automotive
CGRB201-G	Comchip Technology	50	2	1.1 @ 2 A	1.5	5 @ 50 V	DO-214AA (SMB)	— to 150	Active	—
CGRB301-G	Comchip Technology	50	3	1.1 @ 3 A	1.5	5 @ 50 V	DO-214AA (SMB)	— to 150	Active	—
ES2A-13-F	Diodes Incorporated	50	2	0.92 @ 2 A	0.025	5 @ 50 V	DO-214AA (SMB)	-55 to 150	Active	—
ES2AA-13-F	Diodes Incorporated	50	2	0.92 @ 2 A	0.025	5 @ 50 V	DO-214AC (SMA)	-55 to 150	Active	—
RS2A-13-F	Diodes Incorporated	50	1.5	1.3 @ 1.5 A	0.15	5 @ 50 V	DO-214AC (SMA)	-65 to 150	Active	—
RS2AA-13-F	Diodes Incorporated	50	1.5	1.3 @ 1.5 A	0.15	5 @ 50 V	DO-214AC (SMA)	-65 to 150	Active	—
S2A-13-F	Diodes Incorporated	50	1.5	1.15 @ 1.5 A	1.5	5 @ 50 V	DO-214AA (SMB)	-65 to 150	Active	—

Engineering Selection Recommendations

Direct Parametric Equivalents (Recommended Primary Substitutes):

The S2AH (Taiwan Semiconductor Corporation) is the preferred direct substitute. It maintains identical electrical specifications to the S2AHM4G, including 50 V reverse voltage, 2 A average rectified current, 1.15 V forward voltage at 2 A, and 1.5 µs reverse recovery time. The S2AH carries automotive-grade qualification under AEC-Q101 and operates across the same junction temperature range (-55°C to 150°C). Product status is active, ensuring continued availability. Both parts are ROHS3 compliant and carry REACH Unaffected status.

The S2A (Diotec Semiconductor) provides full electrical equivalence with identical voltage, current, and recovery characteristics. Operating temperature range is slightly reduced (-50°C to 150°C). This part is active and ROHS3 compliant, though automotive qualification is not specified.

The S2A R5G (Taiwan Semiconductor Corporation) matches all electrical parameters of the S2AHM4G and maintains the same operating temperature range and automotive-relevant specifications. However, product status is discontinued at DiGi Electronics, limiting long-term procurement viability.

Alternative Substitutes (Application-Dependent):

The CGRB201-G (Comchip Technology) provides 50 V, 2 A operation in DO-214AA package with marginally lower forward voltage (1.1 V @ 2 A). This part is active and ROHS3 compliant. Selection is appropriate where forward voltage reduction is beneficial and automotive qualification is not required.

The ES2A-13-F (Diodes Incorporated) offers 50 V, 2 A in DO-214AA package with significantly reduced forward voltage (0.92 V @ 2 A) and fast recovery characteristics (25 ns trr). This part is suitable for applications requiring enhanced efficiency and is active with full compliance certifications.

Current-Rated Alternatives (Derating Applications):

The S2A-13-F (Diodes Incorporated) provides 50 V operation at 1.5 A in DO-214AA package. This part is appropriate for applications where the 2 A rating of the S2AHM4G exceeds actual circuit requirements, offering cost optimization while maintaining standard recovery characteristics and the same package footprint.

Package Format Alternatives (PCB Layout Constraints):

The ES2AA-13-F (Diodes Incorporated) provides 50 V, 2 A operation in DO-214AC (SMA) package format. Selection is necessary only when PCB layout requires the smaller SMA footprint instead of SMB.

Frequently Asked Questions (FAQ)

Q: Can the S2AH directly replace the S2AHM4G without circuit modification?

A: Yes. The S2AH is a direct parametric equivalent with identical voltage (50 V), current (2 A), forward voltage (1.15 V @ 2 A), and recovery time (1.5 µs) specifications. Both parts use the DO-214AA (SMB) package and operate across -55°C to 150°C. Automotive-grade qualification is maintained. No circuit modification is required.

Q: What is the difference between the S2A (Diotec) and S2AH (Taiwan Semiconductor)?

A: Both parts provide 50 V, 2 A operation with identical electrical characteristics. The primary difference is manufacturer and operating temperature range. The S2A operates from -50°C to 150°C (5°C higher minimum), while the S2AH operates from -55°C to 150°C. The S2AH carries automotive AEC-Q101 qualification; the S2A does not specify automotive grade. For applications requiring full -55°C operation or automotive certification, the S2AH is preferred.

Q: Why is the CGRB301-G listed as a similar part if it is rated for 3 A instead of 2 A?

A: The CGRB301-G maintains the same 50 V reverse voltage and DO-214AA (SMB) package as the S2AHM4G. The 3 A current rating represents a higher capability that can accommodate the 2 A requirement of the original circuit. This part is listed as similar rather than equivalent because the current rating exceeds the original specification. Selection is appropriate only when the higher current capacity provides design margin or when component availability favors this option.

Q: Can I use the ES2A-13-F as a direct replacement?

A: The ES2A-13-F provides 50 V, 2 A operation in the same DO-214AA (SMB) package. However, it features fast recovery characteristics (25 ns trr) compared to the standard recovery (1.5 µs trr) of the S2AHM4G. Forward voltage is also lower (0.92 V @ 2 A versus 1.15 V @ 2 A). These differences may affect circuit performance in applications sensitive to recovery time or forward voltage characteristics. Verification of circuit compatibility is necessary before substitution.

Q: What is the significance of the DO-214AA versus DO-214AC package designation?

A: DO-214AA (SMB) and DO-214AC (SMA) are distinct surface mount package formats with different physical dimensions and PCB footprints. The S2AHM4G uses DO-214AA (SMB). Parts specified with DO-214AC (SMA), such as ES2AA-13-F and RS2AA-13-F, require different PCB layout and cannot be used as direct mechanical substitutes without redesign. Selection of SMA-packaged alternatives is necessary only when PCB constraints require the smaller footprint.

Q: Are all listed substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference are ROHS3 compliant. The S2AHM4G and all identified equivalents and alternatives meet ROHS3 requirements. REACH status varies by manufacturer; most parts are listed as REACH Unaffected or have REACH information available upon request.

Q: Why is the S2A R5G listed as discontinued if it is a parametric equivalent?

A: The S2A R5G is discontinued at DiGi Electronics, indicating reduced availability through primary distribution channels. Although it provides full electrical equivalence to the S2AHM4G, procurement may be limited or subject to extended lead times. The S2AH (active status) is the preferred substitute for new designs and ongoing production requirements.

Q: Can I substitute a 1.5 A part (S2A-13-F) in a circuit designed for 2 A?

A: Substitution of a 1.5 A part in a 2 A circuit is not recommended without circuit analysis. The S2A-13-F is rated for maximum 1.5 A average rectified current. If the circuit requires sustained 2 A operation, the 1.5 A part will operate beyond its rated specification, potentially reducing reliability and lifespan. The S2A-13-F is appropriate only for applications where actual current demand does not exceed 1.5 A.

Q: What compliance certifications are critical for automotive applications?

A: For automotive applications, AEC-Q101 qualification is the critical certification. The S2AHM4G and S2AH both carry AEC-Q101 qualification. Other automotive-relevant substitutes (CGRB201-G, CGRB301-G) do not specify AEC-Q101 qualification. If the original application requires automotive-grade components, selection must be limited to parts explicitly qualified under AEC-Q101.

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