US1A M2G Equivalent & Substitute Parts

Part Overview

The US1A 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 surface mount DO-214AC (SMA) package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement.

The US1A M2G operates across a junction temperature range of -55°C to 150°C and meets ROHS3 compliance requirements. Fast recovery characteristics with a reverse recovery time of 50 ns and forward voltage of 1 V at 1 A define its electrical performance envelope.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the US1A M2G is determined by strict equivalence across the following critical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
Technology: Standard
RoHS Status: ROHS3 Compliant

Secondary Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: 1 V @ 1 A (or lower)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr): 50 ns (or lower)
Current - Reverse Leakage @ Vr: 5 µA @ 50 V (or lower)
Operating Temperature - Junction: -55°C to 150°C (or wider range)

Parts are grouped into three categories:

Parametric Equivalents: Identical electrical specifications and package, manufactured by Taiwan Semiconductor Corporation. These parts share the same base electrical performance and are direct functional replacements.

Direct Manufacturer Equivalents: Parts from alternative manufacturers (Diodes Incorporated, Vishay, Comchip Technology, YAGEO) that meet or exceed the primary equivalence criteria. These parts maintain the same voltage, current, and package specifications with variations in secondary parameters such as forward voltage or reverse recovery time.

Similar Parts: Components that meet the primary voltage, current, and package requirements but exhibit variations in recovery speed or forward voltage characteristics. These parts are suitable for applications where the secondary parameter variations do not impact circuit performance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	trr	Ir @ Vr	Package	Temp Range	Product Status
US1A M2G	Taiwan Semiconductor Corporation	50 V	1 A	1 V @ 1 A	Fast Recovery ≤ 500ns	50 ns	5 µA @ 50 V	DO-214AC (SMA)	-55 to 150°C	Discontinued
HS1A	Taiwan Semiconductor Corporation	50 V	1 A	1 V @ 1 A	Fast Recovery ≤ 500ns	50 ns	5 µA @ 50 V	DO-214AC (SMA)	-55 to 150°C	Active
US1A	Taiwan Semiconductor Corporation	50 V	1 A	1 V @ 1 A	Fast Recovery ≤ 500ns	50 ns	5 µA @ 50 V	DO-214AC (SMA)	-55 to 150°C	Active
US1AH	Taiwan Semiconductor Corporation	50 V	1 A	1 V @ 1 A	Fast Recovery ≤ 500ns	50 ns	5 µA @ 50 V	DO-214AC (SMA)	-55 to 150°C	Active
US1A-13-F	Diodes Incorporated	50 V	1 A	1 V @ 1 A	Fast Recovery ≤ 500ns	50 ns	5 µA @ 50 V	DO-214AC (SMA)	-65 to 150°C	Active
CGRA4001-G	Comchip Technology	50 V	1 A	1.1 V @ 1 A	Standard Recovery >500ns	—	5 µA @ 50 V	DO-214AC (SMA)	-55 to 150°C	Active
ES1A	YAGEO	50 V	1 A	0.95 V @ 1 A	—	—	5 µA @ 50 V	DO-214AC (SMA)	—	Active
ES1A-13-F	Diodes Incorporated	50 V	1 A	920 mV @ 1 A	Fast Recovery ≤ 500ns	25 ns	5 µA @ 50 V	DO-214AC (SMA)	-55 to 150°C	Active
ES1A-E3/5AT	Vishay General Semiconductor - Diodes Division	50 V	1 A	920 mV @ 1 A	Fast Recovery ≤ 500ns	25 ns	5 µA @ 50 V	DO-214AC (SMA)	-55 to 155°C	Active
ES1A-M3/5AT	Vishay General Semiconductor - Diodes Division	50 V	1 A	920 mV @ 1 A	Fast Recovery ≤ 500ns	25 ns	5 µA @ 50 V	DO-214AC (SMA)	-55 to 150°C	Active
ES1A-M3/61T	Vishay General Semiconductor - Diodes Division	50 V	1 A	920 mV @ 1 A	Fast Recovery ≤ 500ns	25 ns	5 µA @ 50 V	DO-214AC (SMA)	-55 to 150°C	Active

Engineering Selection Recommendations

Parametric Equivalents (Highest Priority):

The HS1A, US1A, and US1AH from Taiwan Semiconductor Corporation are parametric equivalents to the US1A M2G. These parts maintain identical electrical specifications and package configuration. The US1A and HS1A are currently in active production status with substantial inventory availability (17,187 and 670 units respectively). The US1AH variant includes AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade components.

Direct Manufacturer Equivalents (High Priority):

The US1A-13-F from Diodes Incorporated is a direct equivalent manufactured by an alternative supplier. This part meets all primary equivalence criteria with an extended operating temperature range of -65°C to 150°C. Inventory availability is substantial at 25,300 units.

The ES1A-13-F, ES1A-E3/5AT, ES1A-M3/5AT, and ES1A-M3/61T from Vishay General Semiconductor and Diodes Incorporated provide improved electrical performance with lower forward voltage (920 mV versus 1 V) and faster reverse recovery time (25 ns versus 50 ns). These characteristics result in reduced power dissipation and improved switching performance. All variants maintain the 50 V / 1 A rating and DO-214AC package specification.

Similar Parts (Conditional Use):

The CGRA4001-G from Comchip Technology meets the primary voltage, current, and package requirements but exhibits standard recovery speed (>500 ns) rather than fast recovery. This part is suitable for applications where switching speed is not a critical performance factor. Forward voltage is specified at 1.1 V, representing a 10% increase over the US1A M2G.

The ES1A from YAGEO meets the primary voltage and current specifications with reduced forward voltage (0.95 V). Detailed electrical specifications for recovery time and operating temperature range are not provided in the available data.

Compliance and Certification:

All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the US1A M2G. All parts are classified under ECCN EAR99 and HTSUS 8541.10.0080.

Frequently Asked Questions (FAQ)

Q: Can the HS1A directly replace the US1A M2G in existing designs?

A: Yes. The HS1A is a parametric equivalent with identical voltage (50 V), current (1 A), forward voltage (1 V @ 1 A), recovery time (50 ns), and package (DO-214AC SMA) specifications. The HS1A is in active production status, addressing the discontinuation of the US1A M2G.

Q: What is the difference between the US1A and US1AH variants?

A: The US1AH includes AEC-Q101 automotive qualification, making it suitable for automotive applications requiring automotive-grade component certification. Electrical specifications are identical to the standard US1A. Both are in active production.

Q: Can ES1A series parts replace the US1A M2G?

A: ES1A series parts (ES1A-13-F, ES1A-E3/5AT, ES1A-M3/5AT, ES1A-M3/61T) meet the primary voltage, current, and package requirements. These parts offer improved performance with lower forward voltage (920 mV versus 1 V) and faster reverse recovery time (25 ns versus 50 ns). They are suitable replacements in applications where improved switching performance is beneficial or neutral.

Q: What is the significance of the forward voltage difference between US1A M2G (1 V) and ES1A variants (920 mV)?

A: The 80 mV reduction in forward voltage results in lower power dissipation during conduction. In high-current or high-frequency applications, this difference may provide thermal benefits. In low-power applications, the difference is negligible.

Q: Is the CGRA4001-G from Comchip Technology a suitable replacement?

A: The CGRA4001-G meets the primary voltage (50 V), current (1 A), and package (DO-214AC SMA) specifications. However, it operates with standard recovery speed (>500 ns) rather than fast recovery (≤500 ns). This part is suitable for applications where switching speed is not performance-critical. Forward voltage is specified at 1.1 V, representing a 10% increase over the US1A M2G.

Q: What packaging options are available for substitute parts?

A: All substitute parts are supplied in DO-214AC (SMA) surface mount package, consistent with the US1A M2G. Packaging variants include Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and standard reels. Specific packaging availability varies by manufacturer and distributor.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, consistent with the US1A M2G.

Q: What is the operating temperature range for substitute parts?

A: The US1A M2G operates from -55°C to 150°C. Substitute parts maintain this range or provide extended ranges: US1A-13-F extends to -65°C; ES1A-E3/5AT extends to 155°C. All other variants maintain the -55°C to 150°C specification.

Q: Which substitute part offers the best inventory availability?

A: The US1A from Taiwan Semiconductor Corporation offers the highest inventory availability at 17,187 units. The ES1A-13-F from Diodes Incorporated provides 70,300 units. Both parts are in active production status.

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