US1A Equivalent & Substitute Parts Reference

Part Overview

The Taiwan Semiconductor Corporation US1A is a surface mount general-purpose fast recovery diode rated at 50 V, 1A, and housed in a DO-214AC (SMA) package. It is classified under Diodes, Rectifiers and is currently listed as active with inventory available. Finding alternative part numbers for US1A is essential for ensuring supply chain continuity, qualifying multiple approved vendors, and maintaining design flexibility in the event of inventory shortages.

Key Parameters

Parameter	Value
Manufacturer Part Number	US1A
Category	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	50 V
Current - Average Rectified (Io)	1A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A
Speed	Fast Recovery =< 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	50 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V
Capacitance @ Vr, F	15pF @ 4V, 1MHz
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)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute and equivalent part numbers for US1A are identified strictly per matching electrical and mechanical parameters. Key substitution criteria include: Voltage - DC Reverse (Vr), Current - Average Rectified (Io), Voltage - Forward (Vf) @ If, Speed and Reverse Recovery Time (trr), Reverse Leakage Current, Capacitance, Package / Case, Mounting Type, Operating Temperature Range, RoHS and REACH compliance, and Moisture Sensitivity Level. Only parts matching these parameters are included as substitutes.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Category	Voltage - DC Reverse (Vr) (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Speed	Reverse Recovery Time (trr)	Current - Reverse Leakage @ Vr	Capacitance @ Vr, F	Mounting Type	Package / Case	Operating Temperature - Junction	RoHS Status	Moisture Sensitivity Level (MSL)	REACH Status
US1A	Taiwan Semiconductor Corporation	Diodes, Rectifiers	50 V	1A	1 V @ 1 A	Fast Recovery =< 500ns, > 200mA (Io)	50 ns	5 µA @ 50 V	15pF @ 4V, 1MHz	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3 Compliant	1 (Unlimited)	REACH Unaffected
US1A-E3/5AT	Vishay General Semiconductor - Diodes Division	Diodes, Rectifiers	50 V	1A	1 V @ 1 A	Fast Recovery =< 500ns, > 200mA (Io)	50 ns	10 µA @ 50 V	15pF @ 4V, 1MHz	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3 Compliant	1 (Unlimited)	REACH Unaffected
US1A-E3/61T	Vishay General Semiconductor - Diodes Division	Diodes, Rectifiers	50 V	1A	1 V @ 1 A	Fast Recovery =< 500ns, > 200mA (Io)	50 ns	10 µA @ 50 V	15pF @ 4V, 1MHz	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3 Compliant	1 (Unlimited)	REACH Unaffected
US1A_R1_00001	Panjit International Inc.	Diodes, Rectifiers	50 V	1A	1 V @ 1 A	Fast Recovery =< 500ns, > 200mA (Io)	50 ns	1 µA @ 50 V	17pF @ 4V, 1MHz	Surface Mount	DO-214AC, SMA	-55°C ~ 150°C	ROHS3 Compliant	1 (Unlimited)	REACH Unaffected

Engineering Selection Recommendations

All substitute parts provided are classified as active and feature RoHS3 compliance, unlimited moisture sensitivity level, and unaffected REACH status. Substitute part numbers are eligible for selection based solely on their matching product status and compliance certifications as documented.

Frequently Asked Questions (FAQ)

Q1: What is the main criterion for substituting US1A in a design?
A1: Substitution requires matching core electrical parameters (Voltage - DC Reverse, Current - Average Rectified, Voltage - Forward at specified current, reverse recovery time, leakage current, and capacitance), package, and mechanical configuration.

Q2: Are all listed substitute diodes available in the same package as US1A?
A2: Yes, all substitutes are specified in the DO-214AC (SMA) surface mount package.

Q3: How should compliance and certifications be considered when selecting substitutes?
A3: All substitutes are specified as ROHS3 compliant and REACH unaffected, with unlimited moisture sensitivity level (MSL 1).

Q4: Are there differences in reverse leakage or capacitance among substitutes?
A4: Yes, there are minor differences. US1A has 5 µA reverse leakage and 15pF capacitance. US1A-E3/5AT and US1A-E3/61T have 10 µA leakage and 15pF capacitance. US1A_R1_00001 has 1 µA leakage and 17pF capacitance.

Q5: Can these substitutes be used interchangeably for lead-free and RoHS applications?
A5: Yes, all listed substitutes are ROHS3 compliant, indicating suitability for lead-free and RoHS applications.

Q6: Is there any difference in operating temperature range across the substitutes?
A6: No, all substitutes share the same junction operating temperature range of -55°C to 150°C.

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