US1AH Equivalent & Substitute Parts

Part Overview

The US1AH is a general-purpose rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as Active product status with AEC-Q101 automotive qualification. Substitute parts are identified to provide design flexibility, supply chain alternatives, and equivalent functional performance for applications requiring 50 V, 1 A fast recovery rectification in surface mount configurations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1 @ 1 A	V
Reverse Recovery Time (trr)	50	ns
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	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the US1AH are qualified based on strict parametric equivalence in the following critical areas:

Voltage Rating: All substitute parts maintain 50 V DC reverse voltage maximum, ensuring compatibility with circuit voltage specifications.

Current Rating: All substitute parts are rated for 1 A average rectified current, matching the primary load-carrying capability.

Forward Voltage: All substitute parts specify 1 V maximum forward voltage at 1 A forward current, maintaining consistent voltage drop characteristics.

Recovery Speed: All substitute parts are classified as fast recovery diodes with reverse recovery time of 50 ns, ensuring equivalent switching performance in high-frequency applications.

Package and Mounting: All substitute parts use DO-214AC (SMA) surface mount package, providing identical PCB footprint and assembly compatibility.

Operating Temperature Range: All substitute parts operate across -55°C to 150°C junction temperature, matching thermal performance requirements.

Compliance: All substitute parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited) moisture sensitivity rating.

Substitution is valid when circuit design requires these exact electrical and mechanical parameters. Differences in reverse leakage current and junction capacitance do not preclude substitution within the specified parameter set.

Parameter Comparison

Parameter	US1AH (Taiwan Semiconductor)	US1A-E3/5AT (Vishay)	US1A-E3/61T (Vishay)	US1A_R1_00001 (Panjit)
Manufacturer	Taiwan Semiconductor Corporation	Vishay General Semiconductor - Diodes Division	Vishay General Semiconductor - Diodes Division	Panjit International Inc.
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1 V @ 1 A	1 V @ 1 A	1 V @ 1 A	1 V @ 1 A
Reverse Recovery Time (trr)	50 ns	50 ns	50 ns	50 ns
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	5 µA @ 50 V	10 µA @ 50 V	10 µA @ 50 V	1 µA @ 50 V
Capacitance @ Vr, F	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	17 pF @ 4V, 1MHz
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 to 150°C	-55°C to 150°C	-55°C to 150°C	-55°C to 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	Active	Active	Active	Active

Engineering Selection Recommendations

All three substitute parts—US1A-E3/5AT, US1A-E3/61T (both Vishay), and US1A_R1_00001 (Panjit)—are functionally equivalent to the US1AH based on the critical electrical and mechanical parameters specified for 50 V, 1 A fast recovery rectification in DO-214AC surface mount packages.

Compliance and Qualification: The US1AH carries AEC-Q101 automotive qualification. The substitute parts maintain equivalent compliance status with ROHS3 certification, REACH unaffected designation, and MSL 1 rating, supporting use in automotive and industrial applications.

Product Status: All parts maintain Active product status, ensuring continued availability and manufacturing support.

Parametric Equivalence: Voltage, current, forward voltage, recovery time, package, mounting type, and operating temperature range are identical across all parts. Variations in reverse leakage current (1 µA to 10 µA range) and junction capacitance (15 pF to 17 pF) fall within acceptable tolerance for general-purpose rectification applications and do not affect functional substitution.

Supply Chain Flexibility: Inventory availability varies across manufacturers. US1A-E3/5AT (5649 pcs), US1A-E3/61T (3900 pcs), and US1A_R1_00001 (2805 pcs) provide alternative sourcing options when primary supply is constrained.

Frequently Asked Questions (FAQ)

Q: Can US1A-E3/5AT, US1A-E3/61T, or US1A_R1_00001 be used as direct replacements for US1AH in existing designs?

A: Yes. All three substitute parts meet the critical electrical parameters: 50 V reverse voltage, 1 A average rectified current, 1 V forward voltage at 1 A, 50 ns reverse recovery time, and identical DO-214AC surface mount package. PCB footprint and assembly process compatibility are maintained.

Q: What is the difference between the Vishay parts (US1A-E3/5AT and US1A-E3/61T)?

A: Both Vishay parts are parametrically identical in voltage, current, forward voltage, recovery time, and package specifications. The designations reflect different manufacturing date codes or tape reel configurations. Selection between them is based on inventory availability and supply chain requirements.

Q: How do the reverse leakage current differences affect substitution?

A: The US1AH specifies 5 µA reverse leakage at 50 V, while Vishay parts specify 10 µA and Panjit specifies 1 µA. These variations are within acceptable tolerance for general-purpose rectifier applications and do not preclude functional substitution. Leakage current differences become significant only in specialized low-leakage or high-impedance circuit applications.

Q: Are there any thermal performance differences between these parts?

A: All parts operate across -55°C to 150°C junction temperature range. Thermal performance is equivalent for the specified operating conditions.

Q: Can these parts be used interchangeably in automotive applications?

A: All parts are ROHS3 compliant and carry equivalent environmental certifications. The US1AH includes AEC-Q101 qualification. Substitute parts maintain equivalent compliance status for automotive use.

Q: What packaging options are available?

A: All parts are supplied in Tape & Reel (TR) surface mount configuration for automated assembly. The DO-214AC (SMA) package provides identical land pattern and reflow soldering compatibility.

Q: Is there a performance difference related to the 2 pF capacitance variation between parts?

A: The US1A_R1_00001 specifies 17 pF junction capacitance compared to 15 pF for other parts, measured at 4 V and 1 MHz. This 2 pF difference is negligible for general-purpose rectification and does not affect switching performance or circuit compatibility.

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