HS1A Equivalent & Substitute Parts Reference

Part Overview

The HS1A 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 diode is classified as a fast recovery device with a reverse recovery time of 50 ns, suitable for standard rectification applications requiring moderate switching speeds. The part is Active in product status and fully compliant with RoHS3 and REACH regulations. Equivalent and substitute parts are identified based on matching electrical performance parameters and mechanical compatibility within the DO-214AC package form factor.

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
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the HS1A are qualified based on the following critical parameters:

Electrical Equivalence 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 ≤ 500 ns, > 200 mA (Io)
Operating Temperature - Junction: -55°C to 150°C

Mechanical Compatibility Criteria:

Package / Case: DO-214AC, SMA
Mounting Type: Surface Mount

All substitute parts listed maintain identical voltage and current ratings, operate within the same temperature range, and are housed in the same DO-214AC surface mount package. Variations in reverse recovery time (trr), reverse leakage current, and junction capacitance remain within acceptable ranges for general-purpose rectification applications. All substitute parts carry Active product status and RoHS3 compliance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	C @ Vr, F [pF]	Package	Inventory [Pcs]
HS1A	Taiwan Semiconductor Corporation	50	1	1 @ 1 A	50	5 @ 50 V	20 @ 4V, 1MHz	DO-214AC, SMA	670
ES1A-HF	Comchip Technology	50	1	1 @ 1 A	35	5 @ 50 V	15 @ 4V, 1MHz	DO-214AC, SMA	768
US1A-E3/5AT	Vishay General Semiconductor - Diodes Division	50	1	1 @ 1 A	50	10 @ 50 V	15 @ 4V, 1MHz	DO-214AC, SMA	5649
US1A-E3/61T	Vishay General Semiconductor - Diodes Division	50	1	1 @ 1 A	50	10 @ 50 V	15 @ 4V, 1MHz	DO-214AC, SMA	3900
US1A_R1_00001	Panjit International Inc.	50	1	1 @ 1 A	50	1 @ 50 V	17 @ 4V, 1MHz	DO-214AC, SMA	2805

Engineering Selection Recommendations

All listed substitute parts maintain full electrical and mechanical compatibility with the HS1A. Selection among equivalent parts is determined by availability, packaging format, and secondary parameter variations:

ES1A-HF (Comchip Technology): Offers improved reverse recovery time of 35 ns compared to the HS1A specification of 50 ns, resulting in faster switching characteristics. Reverse leakage current matches the HS1A at 5 µA @ 50 V. Available in Tape & Reel packaging with 768 units in stock.

US1A-E3/5AT and US1A-E3/61T (Vishay General Semiconductor - Diodes Division): Both variants maintain the HS1A reverse recovery time of 50 ns. Reverse leakage current is specified at 10 µA @ 50 V, which is higher than the HS1A but within acceptable limits for general-purpose rectification. US1A-E3/5AT provides the highest inventory availability at 5649 units; US1A-E3/61T offers 3900 units. Both are supplied in Tape & Reel format.

US1A_R1_00001 (Panjit International Inc.): Demonstrates the lowest reverse leakage current at 1 µA @ 50 V, providing superior leakage performance. Reverse recovery time matches the HS1A at 50 ns. Available in Tape & Reel packaging with 2805 units in stock.

All substitute parts are Active in product status, RoHS3 compliant, and carry REACH Unaffected or REACH Unaffected designation. Moisture Sensitivity Level is 1 (Unlimited) for all parts, indicating no moisture precautions are required during storage or handling.

Frequently Asked Questions (FAQ)

Q: Can ES1A-HF be used as a direct replacement for HS1A?

A: Yes. ES1A-HF meets all critical electrical parameters: 50 V reverse voltage, 1 A average rectified current, 1 V forward voltage drop at 1 A, and fast recovery classification. The package is identical (DO-214AC, SMA). The reverse recovery time of 35 ns is faster than the HS1A specification of 50 ns, which is advantageous for switching performance. Both parts operate across -55°C to 150°C and are RoHS3 compliant.

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

A: Both parts are electrically identical with matching voltage ratings (50 V), current ratings (1 A), forward voltage (1 V @ 1 A), and reverse recovery time (50 ns). The primary difference is inventory availability: US1A-E3/5AT has 5649 units in stock, while US1A-E3/61T has 3900 units. Both are supplied in Tape & Reel packaging by Vishay General Semiconductor - Diodes Division.

Q: How does reverse leakage current affect part selection?

A: Reverse leakage current (Ir) represents the small current flowing through the diode in reverse bias. The HS1A specifies 5 µA @ 50 V. Substitute parts range from 1 µA (US1A_R1_00001) to 10 µA (US1A-E3/5AT, US1A-E3/61T). Lower leakage current improves efficiency in low-power applications; higher leakage remains acceptable for general-purpose rectification. All values are within acceptable limits for the 50 V, 1 A classification.

Q: Are all substitute parts available in the same packaging format as HS1A?

A: All substitute parts use the DO-214AC (SMA) surface mount package, ensuring mechanical compatibility. However, packaging format (bulk versus Tape & Reel) varies. The HS1A inventory specification does not explicitly state packaging format. Substitute parts ES1A-HF, US1A-E3/5AT, US1A-E3/61T, and US1A_R1_00001 are all supplied in Tape & Reel format, which is standard for high-volume surface mount assembly.

Q: What does reverse recovery time (trr) indicate, and why does it vary among substitutes?

A: Reverse recovery time is the interval required for a forward-conducting diode to cease conduction when reverse bias is applied. The HS1A specifies 50 ns. ES1A-HF offers 35 ns, indicating faster switching capability. Faster recovery time reduces switching losses in high-frequency applications. All parts meet the fast recovery classification (≤ 500 ns, > 200 mA), confirming suitability for the intended application category.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 Compliant designation, confirming compliance with the Restriction of Hazardous Substances Directive. This ensures compatibility with modern manufacturing and environmental standards.

Q: What is Moisture Sensitivity Level (MSL), and why is it relevant?

A: Moisture Sensitivity Level indicates the precautions required during storage and handling to prevent moisture absorption, which can cause component failure during soldering. All listed parts, including the HS1A, carry MSL 1 (Unlimited), meaning no moisture control measures are required. Parts can be stored and handled under standard conditions without special desiccant packaging or baking procedures.

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