S1AHM2G Equivalent & Substitute Parts

Part Overview

The S1AHM2G is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design and procurement requirements. The device is qualified to AEC-Q101 automotive standards and operates across a junction temperature range of -55°C to 175°C.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 1 A	V
Reverse Recovery Time (trr)	1.5	µs
Current - Reverse Leakage @ Vr	1	µA @ 50 V
Capacitance @ Vr, F	12	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 175	°C
Grade	Automotive	—
Qualification	AEC-Q101	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the S1AHM2G is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a minimum DC reverse voltage rating of 50 V to ensure safe operation in the original circuit.

Current Rating: The average rectified current must be rated at 1 A or higher. Parts rated above 1 A (such as the GS2A-LTP at 2 A) are acceptable as they provide additional current capacity without reducing performance.

Package Type: The DO-214AC (SMA) surface mount package is the primary form factor. Substitutes in alternative packages (such as DO-214AA/SMB) are classified as similar parts due to different PCB footprints and assembly requirements.

Forward Voltage: Forward voltage drop at rated current is a secondary selection criterion. The S1AHM2G specifies 1.1 V @ 1 A. Substitutes with equal or lower forward voltage are preferred to minimize power dissipation.

Recovery Characteristics: Standard recovery (>500 ns) and fast recovery (≤500 ns) diodes are both acceptable, as recovery speed does not affect basic rectification function in most applications.

Temperature Range: The S1AHM2G operates from -55°C to 175°C. Substitutes with equal or wider temperature ranges are acceptable.

Compliance & Certifications: RoHS3 compliance and REACH unaffected status are maintained across all substitute options.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [µs/ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status
S1AHM2G	Taiwan Semiconductor Corporation	50	1	1.1 @ 1 A	1.5 µs	1 @ 50 V	DO-214AC (SMA)	-55 to 175	Discontinued
S1A	YAGEO	50	1	1.1 @ 1 A	—	—	DO-214AC (SMA)	—	Active
S1A R3G	Taiwan Semiconductor Corporation	50	1	1.1 @ 1 A	1.5 µs	1 @ 50 V	DO-214AC (SMA)	-55 to 175	Discontinued
S1AH	Taiwan Semiconductor Corporation	50	1	1.1 @ 1 A	1.5 µs	1 @ 50 V	DO-214AC (SMA)	-55 to 175	Active
CGRA4001-G	Comchip Technology	50	1	1.1 @ 1 A	—	5 @ 50 V	DO-214AC (SMA)	-55 to 150	Active
ES1A-13-F	Diodes Incorporated	50	1	0.92 @ 1 A	25 ns	5 @ 50 V	DO-214AC (SMA)	-55 to 150	Active
GS2A-LTP	Micro Commercial Co	50	2	1.1 @ 2 A	—	5 @ 50 V	DO-214AC (SMA)	-55 to 150	Active
RGF1A	Fairchild Semiconductor	50	1	1.3 @ 1 A	150 ns	5 @ 50 V	DO-214AC (SMA)	-65 to 175	Active
RS1A-13-F	Diodes Incorporated	50	1	1.3 @ 1 A	150 ns	5 @ 50 V	DO-214AC (SMA)	-65 to 150	Active
RS1AB-13-F	Diodes Incorporated	50	1	1.3 @ 1 A	150 ns	5 @ 50 V	DO-214AA (SMB)	-65 to 150	Active
S1A-13-F	Diodes Incorporated	50	1	1.1 @ 1 A	3 µs	5 @ 50 V	DO-214AC (SMA)	-65 to 150	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacement):

The S1AH manufactured by Taiwan Semiconductor Corporation is the primary parametric equivalent. It maintains identical electrical specifications (50 V, 1 A, 1.1 V forward drop, 1.5 µs recovery time, 1 µA leakage) and operates across the same temperature range (-55°C to 175°C). The S1AH holds active product status and retains AEC-Q101 automotive qualification, making it suitable for applications requiring automotive-grade components.

The S1A R3G, also from Taiwan Semiconductor Corporation, provides identical parametric performance to the S1AHM2G and is discontinued at DiGi Electronics. The S1A from YAGEO offers equivalent electrical performance with active product status, though detailed temperature range and recovery time specifications are not provided in the available data.

Similar Parts (Acceptable Substitutes with Considerations):

The S1A-13-F from Diodes Incorporated matches the 50 V, 1 A, 1.1 V forward voltage specification and is actively produced. It operates across -65°C to 150°C, providing a wider low-temperature range but a narrower high-temperature range compared to the S1AHM2G. The extended reverse recovery time (3 µs versus 1.5 µs) is acceptable for standard rectification applications.

The CGRA4001-G from Comchip Technology maintains 50 V, 1 A ratings with identical forward voltage. Operating temperature is limited to -55°C to 150°C. Higher reverse leakage current (5 µA versus 1 µA) is within acceptable limits for most applications.

The ES1A-13-F from Diodes Incorporated offers superior fast recovery characteristics (25 ns) and lower forward voltage (0.92 V @ 1 A), reducing power dissipation. Temperature range is -55°C to 150°C. This part is suitable for applications where lower forward drop is beneficial.

The RGF1A from Fairchild Semiconductor provides fast recovery (150 ns) and operates across -65°C to 175°C, matching the original temperature range. Higher forward voltage (1.3 V @ 1 A) results in increased power dissipation compared to the S1AHM2G.

The RS1A-13-F from Diodes Incorporated offers fast recovery characteristics and operates across -65°C to 150°C. Forward voltage is 1.3 V @ 1 A.

Higher Current Rating:

The GS2A-LTP from Micro Commercial Co is rated for 2 A average rectified current at 50 V with 1.1 V forward voltage. This part provides additional current capacity and is suitable for applications where the original 1 A rating is marginal or where future design headroom is required. Operating temperature is -55°C to 150°C.

Package Consideration:

The RS1AB-13-F from Diodes Incorporated uses the DO-214AA (SMB) package instead of DO-214AC (SMA). This part requires different PCB footprint and assembly considerations and should only be selected if the target application supports SMB package mounting.

Compliance Status:

All recommended substitutes maintain RoHS3 compliance and REACH unaffected status, consistent with the original S1AHM2G specification.

Frequently Asked Questions (FAQ)

Q: Can the S1AH be used as a direct replacement for the S1AHM2G?

A: Yes. The S1AH is a parametric equivalent with identical voltage rating (50 V), current rating (1 A), forward voltage (1.1 V @ 1 A), reverse recovery time (1.5 µs), and operating temperature range (-55°C to 175°C). It maintains AEC-Q101 automotive qualification and active product status.

Q: What is the difference between parametric equivalents and similar parts?

A: Parametric equivalents match all critical electrical specifications and operating conditions of the original part. Similar parts meet the core voltage and current requirements but may differ in secondary characteristics such as forward voltage, recovery time, or temperature range. Similar parts are acceptable substitutes when the application tolerates these variations.

Q: Can I use a 2 A rated diode (GS2A-LTP) in place of the 1 A S1AHM2G?

A: Yes. A higher current rating provides additional capacity without reducing performance. The GS2A-LTP is rated for 2 A at 50 V with 1.1 V forward voltage, making it suitable for applications where the original 1 A rating is adequate or where additional margin is desired. Verify that the PCB layout and thermal management accommodate the slightly larger package if required.

Q: Does the operating temperature range affect substitution?

A: The S1AHM2G operates from -55°C to 175°C. Substitutes with equal or wider temperature ranges are preferred. Parts with narrower ranges (such as -55°C to 150°C) are acceptable if the application does not require operation above 150°C. Parts with extended low-temperature ranges (such as -65°C) provide additional margin but do not restrict substitution.

Q: What is the significance of forward voltage differences between substitutes?

A: Forward voltage directly affects power dissipation in the diode. The S1AHM2G specifies 1.1 V @ 1 A. Substitutes with lower forward voltage (such as ES1A-13-F at 0.92 V) reduce power dissipation and heat generation. Substitutes with higher forward voltage (such as RGF1A at 1.3 V) increase dissipation. Select based on thermal design requirements and power budget constraints.

Q: Can I use a fast recovery diode (ES1A-13-F, 25 ns) instead of a standard recovery diode (S1AHM2G, 1.5 µs)?

A: Yes. Fast recovery diodes are suitable replacements for standard recovery applications. The faster recovery time reduces switching losses and is beneficial in high-frequency circuits. Standard recovery diodes cannot replace fast recovery diodes in applications requiring fast switching characteristics.

Q: What is the difference between DO-214AC (SMA) and DO-214AA (SMB) packages?

A: DO-214AC (SMA) and DO-214AA (SMB) are different surface mount package outlines with different PCB footprints and land patterns. The RS1AB-13-F uses SMB packaging. Substitution between these packages requires PCB redesign and is not recommended for direct board-level replacement without layout modification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts maintain RoHS3 compliance and REACH unaffected status, consistent with the original S1AHM2G specification.

Q: Which substitute part should I select for automotive applications?

A: The S1AH from Taiwan Semiconductor Corporation is the primary choice for automotive applications, as it maintains AEC-Q101 qualification identical to the S1AHM2G. Other substitutes do not list automotive qualification in the provided specifications.

Q: Can I use the S1A from YAGEO as a direct replacement?

A: The S1A from YAGEO offers equivalent electrical performance (50 V, 1 A, 1.1 V forward voltage) and is actively produced. However, detailed specifications for reverse recovery time, operating temperature range, and reverse leakage current are not provided in the available data. Verify complete specifications with the manufacturer before final selection.

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