US2GA Equivalent & Substitute Parts

Part Overview

The US2GA is a general-purpose rectifier diode manufactured by onsemi, rated for 400 V DC reverse voltage and 1.5 A average rectified current in a DO-214AC (SMA) surface mount package. This component is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio. Equivalent and substitute parts are necessary for applications requiring continued sourcing, design flexibility, or performance optimization within the specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 1.5 A	V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Mounting Type	Surface Mount	—
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

Substitute parts for the US2GA are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical or near-identical electrical specifications (400 V reverse voltage, 1.5 A average rectified current, DO-214AC package, fast recovery characteristics) and are direct functional replacements. These parts satisfy all critical parameters: reverse voltage rating, forward current capacity, package form factor, and thermal operating range.

Functional Substitutes share the same reverse voltage rating (400 V) and package type (DO-214AC/SMA) but differ in one or more secondary parameters such as average rectified current (2 A vs. 1.5 A), reverse recovery time, or forward voltage characteristics. These parts are suitable for applications where the higher current rating or alternative recovery characteristics provide design benefits.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): 400 V (mandatory match)
Mounting Type: Surface Mount (mandatory match)
Package / Case: DO-214AC, SMA (mandatory match)
Current - Average Rectified (Io): 1.5 A (parametric equivalents) or ≥ 1.5 A (functional substitutes)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io) (mandatory match)
Operating Temperature Range: -55°C to 150°C minimum (parametric equivalents)

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status
US2GA	onsemi	400	1.5	1.3 @ 1.5 A	50	5 @ 400 V	DO-214AC (SMA)	-55 to 150	Not For New Designs
RS2GA	Taiwan Semiconductor Corporation	400	1.5	1.3 @ 1.5 A	150	5 @ 400 V	DO-214AC (SMA)	-55 to 150	Active
RS2GAH	Taiwan Semiconductor Corporation	400	1.5	1.3 @ 1.5 A	150	5 @ 400 V	DO-214AC (SMA)	-55 to 150	Active
HS2GA	SURGE	400	1.5	1.3 @ 1.5 A	50	5 @ 400 V	DO-214AC (SMA)	-55 to 150	Active
BYG20G-E3/TR	Vishay General Semiconductor - Diodes Division	400	1.5	1.4 @ 1.5 A	75	1 @ 400 V	DO-214AC (SMA)	-55 to 150	Active
MURA240T3G	onsemi	400	2.0	1.3 @ 2 A	65	5 @ 400 V	DO-214AC (SMA)	-65 to 175	Active
1SR156-400TE25	Rohm Semiconductor	400	1.0	1.3 @ 800 mA	400	10 @ 400 V	DO-214AC (SMA)	-55 to 150	Not For New Designs

Engineering Selection Recommendations

Parametric Equivalents (Direct Replacements):

RS2GA and RS2GAH are parametric equivalents manufactured by Taiwan Semiconductor Corporation. Both maintain 400 V reverse voltage, 1.5 A average rectified current, and DO-214AC package compatibility. RS2GAH carries AEC-Q101 automotive qualification and is recommended for applications requiring automotive-grade reliability. RS2GA is suitable for general industrial applications. Both parts are in Active product status, ensuring long-term availability.

HS2GA, manufactured by SURGE, is a parametric equivalent with identical electrical specifications to the US2GA, including 50 ns reverse recovery time. This part is in Active status and provides an alternative source for applications requiring the same performance characteristics.

Functional Substitute (Higher Current Rating):

MURA240T3G, manufactured by onsemi, is a functional substitute with 2 A average rectified current capacity versus the US2GA's 1.5 A rating. This part maintains 400 V reverse voltage and DO-214AC package compatibility. MURA240T3G is in Active product status and offers an extended operating temperature range (-65°C to 175°C). This part is suitable for applications where higher current capacity or extended temperature performance provides design benefits.

Avalanche Technology Alternative:

BYG20G-E3/TR, manufactured by Vishay General Semiconductor - Diodes Division, is an avalanche-rated diode with 400 V reverse voltage and 1.5 A average rectified current in DO-214AC package. This part features lower reverse leakage current (1 µA @ 400 V) compared to the US2GA (5 µA @ 400 V) and is in Active product status. Avalanche technology provides enhanced transient overvoltage protection.

Not Recommended for New Designs:

1SR156-400TE25, manufactured by Rohm Semiconductor, is classified as "Not For New Designs" and features lower current rating (1 A) and significantly longer reverse recovery time (400 ns), making it unsuitable as a primary substitute.

Frequently Asked Questions (FAQ)

Q: Can RS2GA or RS2GAH be used as direct replacements for US2GA?

A: Yes. Both RS2GA and RS2GAH are parametric equivalents with identical 400 V reverse voltage, 1.5 A average rectified current, and DO-214AC package specifications. RS2GAH includes AEC-Q101 automotive qualification, while RS2GA is suitable for general industrial applications. Both are in Active product status.

Q: What is the difference between RS2GA and RS2GAH?

A: RS2GAH carries AEC-Q101 automotive qualification and is designated for automotive-grade applications. RS2GA is the standard industrial version. Both share identical electrical specifications and package form factor.

Q: Can MURA240T3G replace US2GA in all applications?

A: MURA240T3G is a functional substitute with higher current capacity (2 A vs. 1.5 A) and extended temperature range (-65°C to 175°C vs. -55°C to 150°C). It maintains 400 V reverse voltage and DO-214AC package compatibility. Applications designed for 1.5 A operation will function with MURA240T3G, but the higher current rating and extended temperature range are design enhancements rather than requirements for direct replacement.

Q: What does "Not For New Designs" mean for US2GA?

A: This designation indicates that onsemi has superseded the US2GA in its product portfolio. While existing inventory remains available, the part is not recommended for new circuit designs. Parametric equivalents such as RS2GA, RS2GAH, or HS2GA are recommended for new designs.

Q: Is HS2GA a suitable replacement for US2GA?

A: Yes. HS2GA, manufactured by SURGE, is a parametric equivalent with identical 400 V reverse voltage, 1.5 A average rectified current, 50 ns reverse recovery time, and DO-214AC package specifications. HS2GA is in Active product status.

Q: What is the advantage of BYG20G-E3/TR over US2GA?

A: BYG20G-E3/TR features avalanche technology and lower reverse leakage current (1 µA @ 400 V vs. 5 µA @ 400 V). It maintains 400 V reverse voltage and 1.5 A average rectified current in DO-214AC package. Avalanche technology provides enhanced transient overvoltage protection for applications requiring this capability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (RS2GA, RS2GAH, HS2GA, BYG20G-E3/TR, and MURA240T3G) are ROHS3 compliant, matching the US2GA's environmental compliance status.

Q: Can 1SR156-400TE25 replace US2GA?

A: No. While 1SR156-400TE25 shares the 400 V reverse voltage rating and DO-214AC package, it has lower current capacity (1 A vs. 1.5 A) and significantly longer reverse recovery time (400 ns vs. 50 ns). Additionally, 1SR156-400TE25 is classified as "Not For New Designs." This part is not suitable as a substitute.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in Tape & Reel (TR), Cut Tape (CT), and Bag packaging formats. RS2GA and RS2GAH are supplied in Tape & Reel. HS2GA is supplied in Bag format. BYG20G-E3/TR is supplied in Tape & Reel. MURA240T3G is supplied in Cut Tape & Digi-Reel. Select packaging based on assembly process requirements and volume specifications.

Q: What is the moisture sensitivity level (MSL) for substitute parts?

A: All substitute parts carry MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage and handling, matching the US2GA specification.

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