US2DA Equivalent & Substitute Parts

Part Overview

The US2DA is a general-purpose rectifier diode manufactured by onsemi, rated for 200 V DC reverse voltage and 1.5 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio. Identifying equivalent and substitute parts is necessary for applications requiring continued support, design flexibility, or inventory optimization while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1.5 A	V @ A
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the US2DA is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V (exact match required)
Package / Case: DO-214AC, SMA (exact match required)
Mounting Type: Surface Mount (exact match required)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) (exact match required)

Secondary Compatibility Parameters:

Current - Average Rectified (Io): 1.5 A or higher
Voltage - Forward (Vf) (Max) @ If: 1 V or lower at rated current
Current - Reverse Leakage @ Vr: 5 µA or lower at 200 V
Operating Temperature - Junction: -55°C minimum and 150°C maximum (or wider range)
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents (Identical Electrical and Mechanical Specifications) Parts that match all primary criteria and secondary parameters within the same tolerance band, enabling direct replacement without circuit redesign.

Category 2: Functional Substitutes (Higher Current Rating) Parts that exceed the 1.5 A current requirement while maintaining all other primary criteria, suitable for applications where increased current capacity provides design margin or future-proofing.

Parameter Comparison

Parameter	US2DA (Main)	HS2DA	MURA220T3G	MER2DMA-AU_R2_006A1	BYG22D-E3/TR	MER1DMA-AU_R2_000A1	RF101L2SDDTE25
Manufacturer	onsemi	Good-Ark Semiconductor	onsemi	Panjit International Inc.	Vishay General Semiconductor - Diodes Division	Panjit International Inc.	Rohm Semiconductor
Voltage - DC Reverse (Vr) (Max)	200 V	200 V	200 V	200 V	200 V	200 V	200 V
Current - Average Rectified (Io)	1.5 A	1.5 A	2 A	2 A	2 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1.5 A	1 V @ 1.5 A	950 mV @ 2 A	950 mV @ 2 A	1.1 V @ 2 A	950 mV @ 1 A	870 mV @ 1 A
Reverse Recovery Time (trr)	50 ns	50 ns	35 ns	35 ns	25 ns	35 ns	—
Current - Reverse Leakage @ Vr	5 µA @ 200 V	5 µA @ 200 V	2 µA @ 200 V	1 µA @ 200 V	1 µA @ 200 V	1 µA @ 200 V	10 µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55 to 150 °C	-55 to 150 °C	-65 to 175 °C	-55 to 175 °C	-55 to 150 °C	-55 to 175 °C	Max 150 °C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Not For New Designs	Active	Active	Active	Active	Active	Not For New Designs
AEC-Q101 Qualification	Yes	No	No	Yes	No	Yes	Yes

Engineering Selection Recommendations

Parametric Equivalent - Direct Replacement:

The HS2DA (Good-Ark Semiconductor) is a parametric equivalent to the US2DA. It provides identical electrical specifications including 200 V reverse voltage, 1.5 A average rectified current, 1 V forward voltage at 1.5 A, 50 ns reverse recovery time, and 5 µA reverse leakage current. The HS2DA is in Active product status, ensuring continued availability and support. Both parts share identical operating temperature range (-55°C to 150°C) and are ROHS3 compliant. The HS2DA is suitable for direct substitution in existing designs without circuit modification.

Functional Substitutes - Higher Current Capacity:

The MURA220T3G (onsemi), MER2DMA-AU_R2_006A1 (Panjit International Inc.), and BYG22D-E3/TR (Vishay General Semiconductor - Diodes Division) are functional substitutes rated for 2 A average rectified current. All three maintain the 200 V reverse voltage requirement and DO-214AC (SMA) package specification. These parts are in Active product status and ROHS3 compliant. The increased current rating provides design margin for applications where the 1.5 A specification is marginal. The MER2DMA-AU_R2_006A1 and BYG22D-E3/TR offer improved reverse recovery time (35 ns and 25 ns respectively) compared to the US2DA (50 ns), resulting in lower switching losses. The BYG22D-E3/TR employs Avalanche technology and features the fastest recovery time (25 ns) among the 2 A options.

Lower Current Alternatives:

The MER1DMA-AU_R2_000A1 (Panjit International Inc.) and RF101L2SDDTE25 (Rohm Semiconductor) are rated for 1 A average rectified current, below the US2DA specification. These parts are suitable only for applications where the circuit current requirement does not exceed 1 A. Both maintain 200 V reverse voltage and DO-214AC (SMA) package compatibility. The MER1DMA-AU_R2_000A1 is in Active status with AEC-Q101 qualification. The RF101L2SDDTE25 is classified as "Not For New Designs" and should not be selected for new applications.

Compliance and Qualification Considerations:

For automotive applications requiring AEC-Q101 qualification, the following parts are qualified: US2DA, MER2DMA-AU_R2_006A1, MER1DMA-AU_R2_000A1, and RF101L2SDDTE25. The HS2DA, MURA220T3G, and BYG22D-E3/TR do not carry AEC-Q101 qualification and are not suitable for automotive applications with this requirement.

Frequently Asked Questions (FAQ)

Q: Can the HS2DA be used as a direct replacement for the US2DA?

A: Yes. The HS2DA is a parametric equivalent with identical electrical and mechanical specifications. Both parts are rated for 200 V reverse voltage, 1.5 A average rectified current, 1 V forward voltage at 1.5 A, and use the DO-214AC (SMA) surface mount package. The HS2DA is in Active product status, whereas the US2DA is "Not For New Designs," making the HS2DA the preferred choice for continued support.

Q: What is the difference between the US2DA and the 2 A rated substitutes?

A: The primary difference is current capacity. The US2DA is rated for 1.5 A average rectified current, while MURA220T3G, MER2DMA-AU_R2_006A1, and BYG22D-E3/TR are rated for 2 A. All four parts maintain 200 V reverse voltage and DO-214AC (SMA) package compatibility. The 2 A rated parts provide additional current margin and, in some cases, faster reverse recovery times. These substitutes are suitable for applications where increased current capacity is beneficial or where the circuit current approaches the 1.5 A limit.

Q: Are all substitute parts automotive qualified?

A: No. Only the US2DA, MER2DMA-AU_R2_006A1, MER1DMA-AU_R2_000A1, and RF101L2SDDTE25 carry AEC-Q101 qualification. The HS2DA, MURA220T3G, and BYG22D-E3/TR do not have automotive qualification. For automotive applications requiring AEC-Q101 compliance, selection must be limited to qualified parts.

Q: Can I use a 1 A rated part in place of the US2DA?

A: No. The MER1DMA-AU_R2_000A1 and RF101L2SDDTE25 are rated for 1 A average rectified current, which is below the US2DA specification of 1.5 A. Using an undersized part creates risk of thermal stress and potential failure. These parts are suitable only for applications where the circuit current requirement does not exceed 1 A.

Q: What is the significance of reverse recovery time in these diodes?

A: Reverse recovery time (trr) affects switching losses and electromagnetic interference (EMI) characteristics. The US2DA has a trr of 50 ns. Substitute parts with faster recovery times (MURA220T3G and MER2DMA-AU_R2_006A1 at 35 ns, BYG22D-E3/TR at 25 ns) result in lower switching losses and reduced EMI. Faster recovery times are advantageous in high-frequency switching applications but are not required for all circuit topologies.

Q: Are all parts ROHS3 compliant?

A: Yes. All parts listed—US2DA, HS2DA, MURA220T3G, MER2DMA-AU_R2_006A1, BYG22D-E3/TR, MER1DMA-AU_R2_000A1, and RF101L2SDDTE25—are ROHS3 compliant and REACH unaffected.

Q: What is the difference between the US2DA and BYG22D-E3/TR technology?

A: The US2DA uses Standard rectifier technology, while the BYG22D-E3/TR uses Avalanche technology. Avalanche diodes provide additional protection against reverse voltage transients and overvoltage conditions. The BYG22D-E3/TR maintains the same 200 V reverse voltage rating but offers improved reverse recovery time (25 ns versus 50 ns) and lower reverse leakage current (1 µA versus 5 µA). Avalanche technology is beneficial in applications subject to voltage spikes or transient overvoltages.

Q: Can I use parts with different operating temperature ranges?

A: The US2DA operates from -55°C to 150°C. Substitute parts with wider temperature ranges (MURA220T3G: -65°C to 175°C; MER2DMA-AU_R2_006A1: -55°C to 175°C; MER1DMA-AU_R2_000A1: -55°C to 175°C) are compatible and provide extended temperature capability. Parts with narrower ranges (RF101L2SDDTE25: maximum 150°C) are compatible only if the application does not require operation below -55°C. Wider temperature ranges do not create compatibility issues and may provide design flexibility for extreme environment applications.

Q: What packaging options are available?

A: All substitute parts use the DO-214AC (SMA) surface mount package, identical to the US2DA. Packaging differences exist only in supplier delivery format: the US2DA is supplied in Tape & Reel (TR), while MURA220T3G, BYG22D-E3/TR, and RF101L2SDDTE25 are supplied in Cut Tape (CT) & Digi-Reel®. The MER2DMA-AU_R2_006A1 and MER1DMA-AU_R2_000A1 are supplied in Tape & Reel (TR). These delivery format differences do not affect component electrical or mechanical compatibility.

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