US2JA Equivalent & Substitute Parts

Part Overview

The US2JA is a general-purpose rectifier diode manufactured by onsemi, rated for 600 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 This component is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio.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, legacy system maintenance, or when the primary part becomes unavailable. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating packaging and technology variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1.7 @ 1.5 A	V
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the US2JA are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical or functionally equivalent electrical specifications across voltage rating, current capacity, forward voltage, reverse recovery time, and reverse leakage current. These parts operate within the same thermal range and package footprint, enabling direct substitution without circuit redesign.

Similar Substitutes share the same voltage and package specifications but differ in current rating or technology classification. These parts are suitable for applications where the higher current capacity or alternative technology provides equivalent or improved performance.

The critical parameters determining substitution eligibility are:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 600 V
Current - Average Rectified (Io): Must equal or exceed 1.5 A
Package / Case: Must be DO-214AC (SMA) surface mount
Reverse Recovery Time (trr): Must equal or be faster than 75 ns
Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Parameter Comparison

Parameter	US2JA (Main)	HS2JA	HS2JA R3G	BYG20J-E3/TR	MURA260T3G
Manufacturer	onsemi	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Vishay General Semiconductor	onsemi
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	1.5 A	1.5 A	1.5 A	1.5 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 1.5 A	1.7 V @ 1.5 A	1.7 V @ 1.5 A	1.4 V @ 1.5 A	1.45 V @ 2 A
Reverse Recovery Time (trr)	75 ns	75 ns	75 ns	75 ns	75 ns
Current - Reverse Leakage @ Vr	5 µA @ 600 V	5 µA @ 600 V	5 µA @ 600 V	1 µA @ 600 V	5 µA @ 600 V
Capacitance @ Vr, F	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz	—	—
Package / Case	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
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-65 to 175°C
Technology	Standard	Standard	Standard	Avalanche	Standard
Product Status	Not For New Designs	Active	Discontinued at DiGi Electronics	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

HS2JA (Taiwan Semiconductor Corporation) is the primary parametric equivalent for the US2JA. This part maintains identical electrical specifications including 600 V reverse voltage, 1.5 A average rectified current, 1.7 V forward voltage at 1.5 A, and 75 ns reverse recovery time. The HS2JA operates across the same temperature range (-55°C to 150°C) and is housed in the identical DO-214AC (SMA) surface mount package. The part is currently in active production status, ensuring long-term availability. Both parts are ROHS3 compliant with MSL 1 rating, supporting equivalent environmental and regulatory requirements.

BYG20J-E3/TR (Vishay General Semiconductor - Diodes Division) provides an alternative substitute with identical voltage and current ratings in the same package. This part employs avalanche technology rather than standard technology, resulting in a lower forward voltage of 1.4 V at 1.5 A compared to the US2JA's 1.7 V. The BYG20J-E3/TR maintains the same 75 ns reverse recovery time and operates within the same temperature range. This part is in active production with significantly higher inventory availability (170,300 units). The avalanche technology classification and lower forward voltage may provide improved performance in specific circuit topologies, though circuit validation is required to confirm functional equivalence.

MURA260T3G (onsemi) is a higher-current variant rated for 2 A average rectified current while maintaining the 600 V reverse voltage specification. This part operates across an extended temperature range (-65°C to 175°C) and is in active production status. The MURA260T3G is suitable for applications where the US2JA's 1.5 A rating is marginal or where thermal headroom is beneficial. The forward voltage at 2 A is 1.45 V, which is lower than the US2JA's 1.7 V at 1.5 A, indicating improved efficiency characteristics.

HS2JA R3G (Taiwan Semiconductor Corporation) is a parametric equivalent with identical electrical specifications to the HS2JA but is discontinued at DiGi Electronics with limited inventory (899 units). This part should be considered only when other active alternatives are unavailable and existing stock is confirmed.

For new designs or applications requiring long-term component availability, HS2JA or BYG20J-E3/TR are recommended. For applications requiring extended thermal operating range or higher current capacity, MURA260T3G is appropriate.

Frequently Asked Questions (FAQ)

Q: Can the HS2JA directly replace the US2JA without circuit modification?

A: Yes. The HS2JA is a parametric equivalent with identical voltage rating (600 V), current rating (1.5 A), forward voltage (1.7 V @ 1.5 A), reverse recovery time (75 ns), and operating temperature range (-55°C to 150°C). Both parts use standard rectifier technology and are housed in the DO-214AC (SMA) surface mount package. No circuit redesign is required.

Q: What is the difference between the US2JA and BYG20J-E3/TR?

A: Both parts share identical voltage (600 V) and current (1.5 A) ratings in the same DO-214AC (SMA) package. The primary difference is technology classification: the US2JA uses standard rectifier technology, while the BYG20J-E3/TR uses avalanche technology. The BYG20J-E3/TR exhibits a lower forward voltage (1.4 V @ 1.5 A versus 1.7 V @ 1.5 A) and lower reverse leakage current (1 µA @ 600 V versus 5 µA @ 600 V). These characteristics may provide improved efficiency and lower leakage in specific applications.

Q: Is the MURA260T3G suitable as a substitute for the US2JA?

A: The MURA260T3G is a suitable substitute for applications where the higher current rating (2 A versus 1.5 A) and extended temperature range (-65°C to 175°C versus -55°C to 150°C) provide design benefits. The voltage rating (600 V) and package (DO-214AC, SMA) are identical. The MURA260T3G's lower forward voltage (1.45 V @ 2 A) indicates improved efficiency. However, circuit validation is recommended to confirm functional equivalence in the specific application.

Q: Why is the US2JA marked "Not For New Designs"?

A: The "Not For New Designs" status indicates that onsemi has superseded this part in their product portfolio. Existing designs using the US2JA can continue to operate with available inventory, but new designs should utilize active alternatives such as the HS2JA or MURA260T3G to ensure long-term component availability and support.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (HS2JA, HS2JA R3G, BYG20J-E3/TR, and MURA260T3G) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and regulatory compliance of the US2JA.

Q: What is the difference between HS2JA and HS2JA R3G?

A: Both parts are parametric equivalents with identical electrical specifications. The HS2JA R3G is supplied in Cut Tape (CT) packaging, while the HS2JA is supplied in Tape & Reel (TR) packaging. The HS2JA R3G is discontinued at DiGi Electronics with minimal remaining inventory (899 units), whereas the HS2JA is in active production with higher availability (76,600 units). For new applications, the HS2JA is the preferred choice.

Q: Can I use the MURA260T3G in a circuit designed for the US2JA without any modifications?

A: The MURA260T3G is electrically compatible with the US2JA in terms of voltage rating and package, and the higher current rating (2 A) provides additional margin. However, the extended temperature range (-65°C to 175°C) and lower forward voltage (1.45 V @ 2 A) represent design changes. Circuit validation is recommended to confirm that the different forward voltage characteristics do not affect circuit performance, particularly in applications sensitive to voltage drop or thermal behavior.

Q: Which substitute part has the best long-term availability?

A: The BYG20J-E3/TR has the highest current inventory (170,300 units) and is in active production status. The HS2JA also has strong availability (76,600 units) and active production status. Both parts are suitable for applications requiring long-term component supply assurance.

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