US1A-E3/5AT Equivalent & Substitute Parts

Part Overview

The US1A-E3/5AT is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This surface mount diode is rated for 50 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) package. The part is currently Active and widely available with 5649 pieces in stock. Equivalent and substitute parts are identified to support design flexibility, supply chain continuity, and application-specific performance requirements where the main part may be unavailable or where alternative electrical characteristics better suit specific circuit demands.

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	V @ A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	10 µA @ 50 V	µA @ V
Capacitance @ Vr, F	15	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
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 US1A-E3/5AT are classified into the following categories based on electrical and mechanical compatibility:

Parametric Equivalent (Same Manufacturer, Different Tape Code): Parts with identical electrical specifications and the same DO-214AC package but different manufacturing tape codes or date codes. These parts are direct functional replacements with no performance variation.

Direct Manufacturer Equivalent (Different Manufacturer, Same Specifications): Parts from alternative manufacturers that meet or exceed the primary electrical parameters: 50 V reverse voltage, 1 A average rectified current, DO-214AC package, and fast recovery characteristics. These parts are suitable for direct substitution where supply constraints exist.

Upgrade Parts (Enhanced Performance): Parts with identical or superior voltage and current ratings but extended operating temperature ranges or improved recovery characteristics. These parts provide enhanced reliability in demanding thermal environments.

Manufacturer Recommended Alternatives (Voltage/Current Variants): Parts with the same 1 A current rating and DO-214AC package but different voltage ratings (200 V, 400 V, 1000 V). These are used in applications requiring higher voltage blocking capability while maintaining the same current handling and package footprint.

Schottky Technology Alternative: Parts using Schottky technology instead of standard junction diode technology, offering lower forward voltage drop and faster switching characteristics at the cost of higher reverse leakage current.

Substitution is determined by matching the following key parameters:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 1 A
Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V @ A]	Speed	trr [ns]	Ir @ Vr [µA @ V]	Package	Tj (°C)	Product Status
US1A-E3/5AT	Vishay General Semiconductor	50	1	1 @ 1	Fast Recovery ≤ 500ns	50	10 @ 50	DO-214AC	-55 to 150	Active
US1A-E3/61T	Vishay General Semiconductor	50	1	1 @ 1	Fast Recovery ≤ 500ns	50	10 @ 50	DO-214AC	-55 to 150	Active
GS1A-LTP	Micro Commercial Co	50	1	1 @ 1	Standard Recovery >500ns	—	10 @ 50	DO-214AC	-55 to 150	Not For New Designs
STPS160A	STMicroelectronics	60	1	0.67 @ 1	Fast Recovery ≤ 500ns	—	4 @ 60	DO-214AC	-55 to 150	Active
EGF1A	Fairchild Semiconductor	50	1	1 @ 1	Fast Recovery ≤ 500ns	50	10 @ 50	DO-214AC	-65 to 175	Active
CGRA4001-G	Comchip Technology	50	1	1.1 @ 1	Standard Recovery >500ns	—	5 @ 50	DO-214AC	-55 to 150	Active
CURA103-G	Comchip Technology	200	1	1 @ 1	Fast Recovery ≤ 500ns	50	5 @ 200	DO-214AC	-55 to 150	Active
CURA104-G	Comchip Technology	400	1	1.3 @ 1	Fast Recovery ≤ 500ns	50	5 @ 400	DO-214AC	-55 to 150	Active
CURA107-G	Comchip Technology	1000	1	1.7 @ 1	Fast Recovery ≤ 500ns	75	5 @ 1000	DO-214AC	-55 to 150	Active
GF1A	onsemi	50	1	1 @ 1	Standard Recovery >500ns	2000	5 @ 50	DO-214AC	-65 to 175	Not For New Designs
S1A	YAGEO	50	1.1	1.1 @ 1	—	—	—	DO-214AC	—	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Performance): The US1A-E3/61T from Vishay General Semiconductor is a parametric equivalent offering identical electrical specifications and the same DO-214AC package. Both parts are Active status and ROHS3 compliant. This part is suitable for direct substitution without circuit redesign.

For Supply Chain Continuity: The EGF1A from Fairchild Semiconductor and STPS160A from STMicroelectronics are Active status alternatives. The EGF1A maintains identical electrical specifications with an extended operating temperature range (-65°C to 175°C). The STPS160A is a Schottky technology variant with 60 V rating, lower forward voltage (0.67 V vs. 1 V), and lower reverse leakage (4 µA vs. 10 µA), suitable for applications prioritizing efficiency over recovery speed.

For Higher Voltage Applications: The CURA103-G (200 V), CURA104-G (400 V), and CURA107-G (1000 V) from Comchip Technology maintain the 1 A current rating and DO-214AC package while providing higher voltage blocking capability. These parts are Active status and ROHS3 compliant. Forward voltage increases with voltage rating (1 V at 200 V, 1.3 V at 400 V, 1.7 V at 1000 V).

Parts Not Recommended for New Designs: GS1A-LTP (Micro Commercial Co) and GF1A (onsemi) are marked "Not For New Designs" and should be avoided in new circuit development. These parts are retained in this reference for legacy system support only.

Compliance Verification: All recommended substitute parts maintain ROHS3 compliance, Moisture Sensitivity Level 1 (Unlimited), and REACH Unaffected status, matching the regulatory profile of the main part.

Frequently Asked Questions (FAQ)

Q: Can US1A-E3/61T be used as a direct replacement for US1A-E3/5AT?

A: Yes. Both parts are manufactured by Vishay General Semiconductor with identical electrical specifications: 50 V reverse voltage, 1 A average rectified current, 1 V forward voltage at 1 A, fast recovery characteristics (50 ns), and DO-214AC package. The difference is the tape code (61T vs. 5AT), which reflects manufacturing date code or reel configuration only. No circuit modification is required.

Q: What is the difference between the US1A-E3/5AT and STPS160A?

A: The STPS160A is a Schottky diode with 60 V reverse voltage rating (vs. 50 V) and significantly lower forward voltage drop (0.67 V vs. 1 V at 1 A). Schottky diodes have lower reverse leakage (4 µA vs. 10 µA) and faster switching. However, Schottky diodes exhibit higher reverse leakage at elevated temperatures. Both use the DO-214AC package. The STPS160A is suitable for applications where efficiency and switching speed are critical.

Q: Can I use CURA103-G, CURA104-G, or CURA107-G in place of US1A-E3/5AT?

A: These parts share the same 1 A current rating and DO-214AC package but have higher voltage ratings (200 V, 400 V, 1000 V respectively). They are electrically compatible for circuits designed for 50 V operation, as they will block higher voltages without degradation. However, forward voltage increases with voltage rating. Use these parts only if higher voltage blocking capability is required or if the primary part is unavailable.

Q: Why is GF1A marked "Not For New Designs"?

A: GF1A from onsemi is a legacy part with standard recovery characteristics (2 µs recovery time vs. 50 ns for the main part). While electrically compatible, it exhibits slower switching performance. New designs should use Active status alternatives such as EGF1A or the main part US1A-E3/5AT.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance and Moisture Sensitivity Level 1 (Unlimited), matching the regulatory and handling requirements of the main part US1A-E3/5AT.

Q: What is the significance of "Fast Recovery ≤ 500ns" vs. "Standard Recovery >500ns"?

A: Fast recovery diodes (≤ 500ns) switch off more quickly, reducing switching losses and enabling higher frequency operation. Standard recovery diodes (> 500ns) are slower but may exhibit lower forward voltage in some applications. The US1A-E3/5AT is a fast recovery device. Substitutes with standard recovery (GS1A-LTP, CGRA4001-G, GF1A) are suitable only if circuit frequency and switching loss requirements permit slower recovery.

Q: Can I substitute US1A-E3/5AT with S1A from YAGEO?

A: S1A is an Active status part with 50 V rating and 1.1 A current capability in a DO-214AC package. However, limited detailed specifications are provided in the reference data. Verify forward voltage, recovery time, and reverse leakage characteristics against your circuit requirements before substitution.

Q: What is the operating temperature range difference between US1A-E3/5AT and EGF1A?

A: US1A-E3/5AT operates from -55°C to 150°C junction temperature. EGF1A operates from -65°C to 175°C, providing 10°C lower minimum and 25°C higher maximum operating temperature. EGF1A is suitable for applications requiring extended thermal range without performance degradation.

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