US1AHE3_A/I Equivalent & Substitute Parts

Part Overview

The US1AHE3_A/I is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount component operates at 50 V DC reverse voltage with 1 A average rectified current in a DO-214AC (SMA) package. The part is classified as Active product status with AEC-Q101 automotive qualification and ROHS3 compliance.

Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing due to inventory constraints, supply chain considerations, or specific manufacturing specifications while maintaining electrical and mechanical compatibility within the defined parameter ranges.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1	V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	10	µA @ 50 V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
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 US1AHE3_A/I are grouped based on strict electrical and mechanical parameter matching within the following criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 1 A
Voltage - Forward (Vf) (Max) @ If: 1 V @ 1 A
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Recovery Time (trr): 50 ns (or lower)
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Parametric Equivalent Parts maintain all electrical specifications and package requirements identical to the main part, with variations only in manufacturer, packaging format (Tape & Reel variants), or minor improvements in reverse leakage current and recovery time characteristics.

Upgrade Parts provide equivalent electrical performance with extended operating temperature ranges or improved specifications while maintaining package and mounting compatibility.

Manufacturer Recommended Parts are functionally equivalent alternatives from different manufacturers with comparable electrical characteristics and surface mount packaging.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Temp Range [°C]	RoHS
US1AHE3_A/I	Vishay	50	1	1 @ 1A	50	10 @ 50V	DO-214AC	-55 to 150	ROHS3
US1A-E3/5AT	Vishay	50	1	1 @ 1A	50	10 @ 50V	DO-214AC	-55 to 150	ROHS3
US1A-E3/61T	Vishay	50	1	1 @ 1A	50	10 @ 50V	DO-214AC	-55 to 150	ROHS3
EGF1A	Fairchild Semiconductor	50	1	1 @ 1A	50	10 @ 50V	DO-214AC	-65 to 175	Not Specified
ES1A	YAGEO	50	1	0.95 @ 1A	Not Specified	Not Specified	DO-214AC	Not Specified	ROHS3
S1A	YAGEO	50	1	1.1 @ 1A	Not Specified	Not Specified	DO-214AC	Not Specified	ROHS3
ES1A-HF	Comchip Technology	50	1	1 @ 1A	35	5 @ 50V	DO-214AC	-55 to 150	ROHS3
US1A_R1_00001	Panjit International Inc.	50	1	1 @ 1A	50	1 @ 50V	DO-214AC	-55 to 150	ROHS3

Engineering Selection Recommendations

Parametric Equivalent Selection (US1A-E3/5AT, US1A-E3/61T, US1A_R1_00001): These parts maintain identical electrical specifications to the US1AHE3_A/I with full parameter alignment. Selection among these equivalents is determined by packaging format availability (Tape & Reel variants) and inventory status. All three are Active product status with ROHS3 compliance and MSL 1 rating.

Enhanced Performance Alternative (ES1A-HF): The ES1A-HF from Comchip Technology provides improved reverse recovery time (35 ns versus 50 ns) and reduced reverse leakage current (5 µA versus 10 µA) while maintaining all other electrical parameters and package specifications. This part is suitable for applications requiring faster switching characteristics.

Extended Temperature Range Option (EGF1A): The EGF1A from Fairchild Semiconductor extends the operating temperature range to -65°C to 175°C compared to the standard -55°C to 150°C range. This part maintains electrical equivalence and is appropriate for applications requiring broader thermal operating conditions. RoHS compliance status is not specified for this part.

Manufacturer Recommended Alternatives (ES1A, S1A): YAGEO parts ES1A and S1A are functionally equivalent with minor forward voltage variations (0.95 V and 1.1 V respectively versus 1 V nominal). These parts are available in Cut Tape and Digi-Reel packaging formats with high inventory availability and ROHS3 compliance. Detailed electrical specifications for reverse recovery time and leakage current are not provided.

Selection Criteria Summary:

All substitute parts maintain 50 V reverse voltage and 1 A current ratings
All substitute parts use DO-214AC surface mount packaging
All substitute parts with specified compliance are ROHS3 compliant
Reverse recovery time and leakage current specifications vary among manufacturers
Operating temperature ranges differ between manufacturers

Frequently Asked Questions (FAQ)

Q: Can US1A-E3/5AT be used as a direct replacement for US1AHE3_A/I?

A: Yes. The US1A-E3/5AT is a parametric equivalent with identical electrical specifications (50 V, 1 A, 1 V forward voltage, 50 ns recovery time) and identical package configuration (DO-214AC surface mount). The difference is the packaging format (Tape & Reel variant designation). Both parts are Active status with ROHS3 compliance and MSL 1 rating.

Q: What is the difference between ES1A-HF and the main part US1AHE3_A/I?

A: The ES1A-HF maintains the same voltage (50 V), current (1 A), and forward voltage (1 V) specifications. The differences are: reverse recovery time is faster (35 ns versus 50 ns), reverse leakage current is lower (5 µA versus 10 µA), and the manufacturer is Comchip Technology instead of Vishay. The package remains DO-214AC surface mount.

Q: Are YAGEO parts ES1A and S1A fully equivalent to US1AHE3_A/I?

A: ES1A and S1A maintain the 50 V reverse voltage and 1 A current ratings with DO-214AC packaging. Forward voltage specifications differ slightly (ES1A at 0.95 V and S1A at 1.1 V versus 1 V nominal). Detailed specifications for reverse recovery time and leakage current are not provided for these parts. Both are ROHS3 compliant with MSL 1 rating.

Q: Can EGF1A from Fairchild be used in place of US1AHE3_A/I?

A: Yes, for electrical performance. The EGF1A maintains 50 V reverse voltage, 1 A current, and 1 V forward voltage specifications with identical DO-214AC packaging. The operating temperature range extends to -65°C to 175°C compared to -55°C to 150°C. RoHS compliance status is not specified for the EGF1A.

Q: What does "Tape & Reel (TR)" packaging mean versus "Cut Tape (CT) & Digi-Reel®"?

A: Both are surface mount packaging formats for automated assembly. Tape & Reel (TR) is a continuous reel format for high-volume production. Cut Tape (CT) & Digi-Reel® are alternative reel formats. The electrical component itself (the diode in DO-214AC package) is identical; only the delivery and handling format differs.

Q: Which substitute part has the best reverse recovery time performance?

A: The ES1A-HF has the fastest reverse recovery time at 35 ns, compared to 50 ns for the US1AHE3_A/I and other Vishay equivalents. This faster recovery time reduces switching losses in high-frequency applications.

Q: Are all substitute parts automotive qualified?

A: The US1AHE3_A/I carries AEC-Q101 automotive qualification. Among the substitutes, only the Vishay parts (US1A-E3/5AT, US1A-E3/61T) and Panjit part (US1A_R1_00001) explicitly reference automotive-grade specifications. Automotive qualification status is not specified for Fairchild EGF1A, YAGEO ES1A and S1A, or Comchip ES1A-HF.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Moisture Sensitivity Level 1) with Unlimited rating indicates the component has no moisture sensitivity restrictions. These parts can be stored indefinitely without special moisture control measures and do not require baking before reflow soldering.

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