Equivalent & Substitute Parts Reference: US2A-HF Diode

Part Overview

The US2A-HF is a surface mount general-purpose fast recovery rectifier diode manufactured by Comchip Technology. Key electrical ratings include a DC reverse voltage (Vr) of 50 V and an average rectified current (Io) of 2 A, with a maximum forward voltage (Vf) of 1 V at 2 A and a reverse recovery time (trr) of 50 ns. The device uses the DO-214AC (SMA) package. As an active product, alternative models may be needed for design flexibility, increased supply reliability, or to meet compliance and inventory requirements.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	50 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 2 A
Speed	Fast Recovery =< 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V
Mounting Type	Surface Mount
Package / Case	DO-214AC, SMA
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for rectifier diodes in the DO-214AC (SMA) package is determined strictly by voltage rating, current capacity, forward voltage, reverse recovery time, reverse leakage current, mounting type, package compliance, and operating temperature range. Substitute parts are listed only if they match these defined criteria.

Key parameters for substitution:

Voltage - DC Reverse (Vr) (Max)
Current - Average Rectified (Io)
Voltage - Forward (Vf) (Max) @ If
Speed / Reverse Recovery Time (trr)
Current - Reverse Leakage @ Vr
Mounting Type
Package / Case
Operating Temperature - Junction
Compliance & MSL

Parameter Comparison

Parameter	US2A-HF	ES2A-HF
Manufacturer	Comchip Technology	Comchip Technology
Voltage - DC Reverse (Vr) (Max)	50 V	50 V
Current - Average Rectified (Io)	2 A	2 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 2 A	1 V @ 2 A
Speed / Reverse Recovery Time (trr)	50 ns	35 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V
Mounting Type	Surface Mount	Surface Mount
Package / Case	DO-214AC, SMA	DO-214AC, SMA
Operating Temperature - Junction	-55°C ~ 150°C	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

US2A-HF and ES2A-HF are both active models with ROHS3 compliance and MSL 1 (unlimited). Both devices share identical voltage, current, forward voltage rating, reverse leakage current, mounting type, package, and junction temperature range. Either selection meets requirements for regulatory and supply chain compatibility under the specified parameters.

Frequently Asked Questions (FAQ)

Q: Can ES2A-HF replace US2A-HF in existing designs?
A: ES2A-HF is equivalent to US2A-HF in all specified key electrical and mechanical parameters and packaging, making it suitable as a direct substitute.

Q: Are the package and mounting type identical for both parts?
A: Both US2A-HF and ES2A-HF use the DO-214AC (SMA) surface mount package.

Q: Is there any difference relevant to reverse recovery speed?
A: ES2A-HF has a reverse recovery time of 35 ns versus US2A-HF’s 50 ns. Both values fall within the specified “Fast Recovery” definition for this category.

Q: Do both diodes comply with ROHS3 and moisture sensitivity requirements?
A: Both are ROHS3 Compliant and have a Moisture Sensitivity Level (MSL) of 1 (Unlimited).

Q: Should inventory or supply status be considered in selection?
A: Both part numbers are listed as active and available; inventory status can be referenced to determine supply availability.

Q: How is compatibility determined for diode substitution?
A: Compatibility is based strictly on voltage, current, forward voltage, reverse recovery time, leakages, package type, temperature range, compliance, and moisture sensitivity level as provided.

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