S1A M2G Equivalent & Substitute Parts

Part Overview

The S1A M2G 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 requirements and production needs. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer compatible performance within defined parameter tolerances for the same application category.

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
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the S1A M2G is determined by the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 1 A minimum
Voltage - Forward (Vf) (Max) @ If: 1.1 V or lower at 1 A
Operating Temperature - Junction: -55°C to 175°C or wider range

Mechanical Compatibility Criteria:

Package / Case: DO-214AC (SMA) or equivalent surface mount package
Mounting Type: Surface Mount

Compliance Criteria:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Parts are classified as Parametric Equivalents when all electrical and mechanical specifications match the S1A M2G within the defined tolerances. Parts are classified as Similar when they meet the core voltage and current requirements but may differ in secondary parameters such as recovery time, forward voltage, or package variant, provided they remain functionally compatible for general-purpose rectification applications.

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
S1A M2G	Taiwan Semiconductor Corporation	50	1	1.1 @ 1 A	1.5	1 @ 50 V	DO-214AC (SMA)	-55 to 175	Discontinued
S1A	YAGEO	50	1	1.1	—	—	DO-214AC (SMA)	—	Active
S1A R3G	Taiwan Semiconductor Corporation	50	1	1.1 @ 1 A	1.5	1 @ 50 V	DO-214AC (SMA)	-55 to 175	Discontinued
S1AH	Taiwan Semiconductor Corporation	50	1	1.1 @ 1 A	1.5	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	0.025	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
RS1A-13-F	Diodes Incorporated	50	1	1.3 @ 1 A	0.15	5 @ 50 V	DO-214AC (SMA)	-65 to 150	Active
RS1AB-13-F	Diodes Incorporated	50	1	1.3 @ 1 A	0.15	5 @ 50 V	DO-214AA (SMB)	-65 to 150	Active
S1A-13-F	Diodes Incorporated	50	1	1.1 @ 1 A	3	5 @ 50 V	DO-214AC (SMA)	-65 to 150	Active
S1AB-13-F	Diodes Incorporated	50	1	1.1 @ 1 A	3	5 @ 50 V	DO-214AA (SMB)	-65 to 150	Active

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacement):

The following parts are parametric equivalents and maintain identical electrical and mechanical specifications to the S1A M2G:

S1A R3G (Taiwan Semiconductor Corporation): Identical specifications with standard recovery characteristics. Product status is discontinued at DiGi Electronics; however, inventory is available. Suitable for direct substitution in existing designs.
S1AH (Taiwan Semiconductor Corporation): Identical electrical specifications with automotive-grade qualification (AEC-Q101). Product status is active. Recommended for applications requiring automotive-grade components or extended reliability assurance.
S1A (YAGEO): Meets core electrical specifications with active product status and high inventory availability. Suitable for direct substitution.

Similar Parts (Compatible Substitutes):

The following parts meet core voltage and current requirements with acceptable parameter variations for general-purpose rectification:

S1A-13-F (Diodes Incorporated): Matches forward voltage specification (1.1 V @ 1 A) with active product status and extensive inventory. Extended reverse recovery time (3 µs) is acceptable for standard recovery applications. Operating temperature range is -65°C to 150°C, which covers the S1A M2G minimum requirement of -55°C.
S1AB-13-F (Diodes Incorporated): Identical electrical specifications to S1A-13-F but in DO-214AA (SMB) package. Suitable for designs where SMB package footprint is acceptable. Active product status with high inventory.
CGRA4001-G (Comchip Technology): Meets voltage and current specifications with active product status. Operating temperature range is -55°C to 150°C. Reverse leakage current is 5 µA, which is higher than the S1A M2G specification of 1 µA but acceptable for general-purpose applications.
ES1A-13-F (Diodes Incorporated): Fast recovery diode (trr = 25 ns) with lower forward voltage (0.92 V @ 1 A). Suitable for applications benefiting from reduced forward voltage drop and faster switching. Active product status with high inventory.
RS1A-13-F (Diodes Incorporated): Fast recovery diode with extended operating temperature range (-65°C to 150°C). Forward voltage is 1.3 V @ 1 A, which exceeds the S1A M2G specification but remains within acceptable limits for general-purpose rectification. Active product status with high inventory.
RS1AB-13-F (Diodes Incorporated): Equivalent to RS1A-13-F in DO-214AA (SMB) package. Suitable for designs where SMB package footprint is acceptable.
GS2A-LTP (Micro Commercial Co): Higher current rating (2 A) with identical voltage specifications. Suitable for applications requiring increased current capacity. Active product status with available inventory.

Product Status Consideration:

The S1A M2G is discontinued at DiGi Electronics. All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) rating, ensuring compatibility with existing supply chain and manufacturing processes.

Frequently Asked Questions (FAQ)

Q: Can the S1A-13-F replace the S1A M2G directly?

A: Yes. The S1A-13-F meets the core electrical specifications of the S1A M2G with identical forward voltage (1.1 V @ 1 A) and voltage rating (50 V). Both are rated for 1 A average rectified current in DO-214AC (SMA) package. The reverse recovery time differs (3 µs versus 1.5 µs), but this is acceptable for standard recovery applications. The S1A-13-F is active and widely available.

Q: What is the difference between S1AB-13-F and S1A-13-F?

A: The S1AB-13-F and S1A-13-F are electrically identical. The primary difference is the package: S1A-13-F uses DO-214AC (SMA) package, while S1AB-13-F uses DO-214AA (SMB) package. SMB is a larger package footprint. Selection depends on PCB layout requirements and available board space.

Q: Is the S1AH suitable for automotive applications?

A: Yes. The S1AH carries automotive-grade qualification (AEC-Q101) and is rated for the same electrical specifications as the S1A M2G. It is the recommended choice for automotive or mission-critical applications requiring enhanced reliability assurance.

Q: Can I use the GS2A-LTP as a substitute?

A: The GS2A-LTP is a 2 A rated diode, compared to the 1 A rating of the S1A M2G. It meets the voltage specification (50 V) and forward voltage (1.1 V @ 2 A). The higher current rating makes it suitable for applications where increased current capacity is beneficial or required. It is not a direct replacement but is a compatible upgrade for current-limited designs.

Q: What is the difference between standard recovery and fast recovery diodes?

A: Standard recovery diodes have longer reverse recovery times (typically >500 ns), while fast recovery diodes have shorter reverse recovery times (typically ≤500 ns). The S1A M2G is a standard recovery diode (trr = 1.5 µs). Fast recovery alternatives such as ES1A-13-F (trr = 25 ns) are suitable for applications requiring faster switching or reduced switching losses. Standard recovery diodes are appropriate for general-purpose rectification at lower switching frequencies.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance, matching the S1A M2G specification. All parts also carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions during storage and handling.

Q: What is the operating temperature range difference between S1A M2G and substitute parts?

A: The S1A M2G operates from -55°C to 175°C. Most substitute parts operate from -55°C to 150°C or -65°C to 150°C. The S1A M2G has a higher maximum junction temperature (175°C). For applications requiring operation above 150°C, the S1AH or S1A R3G are recommended as they maintain the -55°C to 175°C range.

Q: Can I use RS1A-13-F if the forward voltage specification is 1.3 V instead of 1.1 V?

A: The RS1A-13-F forward voltage specification of 1.3 V @ 1 A exceeds the S1A M2G specification of 1.1 V @ 1 A by 0.2 V. This difference is acceptable for general-purpose rectification applications where the additional voltage drop does not impact circuit performance. For applications with tight voltage margin requirements, the S1A-13-F or ES1A-13-F are preferred alternatives.

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