US2FA Equivalent & Substitute Parts Reference

Part Overview

The US2FA is a general-purpose rectifier diode manufactured by onsemi, rated for 300 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 reached end-of-life status. Identifying equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original part is no longer readily available or where design flexibility permits alternative components meeting the same electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	300	V
Current - Average Rectified (Io)	1.5	A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1.5 A	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5 µA @ 300 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the US2FA are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical or equivalent electrical performance across all critical parameters: reverse voltage (300 V), average rectified current (1.5 A), forward voltage drop (1 V @ 1.5 A), reverse recovery time (50 ns), reverse leakage current (5 µA @ 300 V), and package form factor (DO-214AC/SMA). These parts are direct functional replacements.

Functional Substitutes share the same reverse voltage rating (300 V) and package type (DO-214AC/SMA) but operate at higher current ratings (2 A versus 1.5 A). These parts are suitable for applications where the circuit can accommodate increased current capacity without adverse effects.

The following parameters determine substitution eligibility:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 300 V
Package / Case: Must be DO-214AC or SMA
Mounting Type: Must be Surface Mount
Current - Average Rectified (Io): Must equal or exceed 1.5 A
Operating Temperature Range: Must encompass or exceed -55°C ~ 150°C

Parameter Comparison

Parameter	US2FA (onsemi)	MURA230T3G (onsemi)	HS2FA (SURGE)	HS2FA R3G (Taiwan Semiconductor)
Voltage - DC Reverse (Vr) (Max)	300 V	300 V	300 V	300 V
Current - Average Rectified (Io)	1.5 A	2 A	1.5 A	1.5 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1.5 A	1.3 V @ 2 A	1 V @ 1.5 A	1 V @ 1.5 A
Reverse Recovery Time (trr)	50 ns	65 ns	50 ns	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 300 V	5 µA @ 300 V	5 µA @ 300 V	5 µA @ 300 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Package / Case	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA	DO-214AC, SMA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C	-65°C ~ 175°C	-55°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
Product Status	Not For New Designs	Active	Active	Discontinued at DiGi Electronics

Engineering Selection Recommendations

HS2FA (SURGE) is the primary parametric equivalent for the US2FA. This part maintains identical electrical specifications across all critical parameters: 300 V reverse voltage, 1.5 A average rectified current, 1 V forward voltage drop at 1.5 A, 50 ns reverse recovery time, and 5 µA reverse leakage current. The HS2FA is rated for the same operating temperature range (-55°C ~ 150°C) and is housed in the identical DO-214AC/SMA package. Product status is Active, ensuring ongoing availability. RoHS3 compliance and MSL 1 rating match the original part. This substitute is suitable for direct replacement in all applications where the US2FA was originally specified.

MURA230T3G (onsemi) is a functional substitute with higher current capacity (2 A versus 1.5 A) while maintaining the same 300 V reverse voltage rating and DO-214AC/SMA package form factor. The forward voltage drop increases to 1.3 V at 2 A, and reverse recovery time extends to 65 ns. Operating temperature range is expanded to -65°C ~ 175°C. This part is suitable for applications where increased current headroom is beneficial and where the slightly higher forward voltage drop and longer recovery time do not compromise circuit performance. Product status is Active. RoHS3 compliance and MSL 1 rating are maintained.

HS2FA R3G (Taiwan Semiconductor Corporation) is a parametric equivalent matching the US2FA across all electrical specifications. However, product status is listed as "Discontinued at DiGi Electronics," indicating limited availability. This part should be considered only when HS2FA is unavailable and when supply chain continuity is not a primary concern.

For new procurement and long-term supply chain planning, HS2FA (SURGE) is the recommended primary substitute, with MURA230T3G (onsemi) as a secondary option where higher current capacity is acceptable.

Frequently Asked Questions (FAQ)

Q: Can MURA230T3G be used as a direct replacement for US2FA?

A: MURA230T3G is a functional substitute, not a parametric equivalent. While it shares the same 300 V reverse voltage rating and DO-214AC/SMA package, it operates at 2 A average rectified current compared to the US2FA's 1.5 A rating. The forward voltage drop increases from 1 V to 1.3 V at its rated current, and reverse recovery time extends from 50 ns to 65 ns. Substitution is permissible in applications where these parameter differences do not degrade circuit performance.

Q: What is the difference between HS2FA and HS2FA R3G?

A: Both parts are parametric equivalents with identical electrical specifications (300 V, 1.5 A, 1 V forward voltage, 50 ns recovery time). The primary difference is product status: HS2FA is Active, while HS2FA R3G is Discontinued at DiGi Electronics. For ongoing applications, HS2FA is the preferred choice due to superior availability.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. US2FA, MURA230T3G, HS2FA, and HS2FA R3G are all ROHS3 Compliant. All parts carry MSL 1 (Unlimited) moisture sensitivity rating, indicating no special moisture handling requirements during storage or assembly.

Q: Can these diodes be used in automotive applications?

A: The US2FA carries automotive grade qualification (AEC-Q101). Substitute parts HS2FA and HS2FA R3G do not list automotive qualification in their specifications. MURA230T3G does not specify automotive qualification. If automotive qualification is a design requirement, the US2FA remains the only qualified option among the listed parts.

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

A: US2FA, HS2FA, and HS2FA R3G operate across -55°C ~ 150°C. MURA230T3G has an expanded range of -65°C ~ 175°C, providing greater thermal margin in extreme temperature environments.

Q: Are these parts available in different packaging formats?

A: All substitute parts are housed in DO-214AC/SMA surface mount packages. Packaging format (Tape & Reel, Cut Tape, Bag, or Digi-Reel) varies by supplier but does not affect electrical or mechanical compatibility. Packaging selection should be based on assembly process requirements and inventory management practices.

Q: What is the reverse recovery time significance?

A: Reverse recovery time (trr) is the interval required for a diode to transition from forward conduction to reverse blocking. US2FA, HS2FA, and HS2FA R3G all specify 50 ns recovery time. MURA230T3G specifies 65 ns. In high-frequency switching applications, the longer recovery time of MURA230T3G may introduce additional switching losses or timing constraints.

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