HS1K Equivalent & Substitute Parts

Part Overview

The HS1K is a fast recovery rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 800V DC reverse voltage and 1A average rectified current. This surface mount diode is designed for general-purpose rectification applications requiring fast switching characteristics with a 75 nanosecond reverse recovery time. The HS1K is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Identifying equivalent and substitute parts is necessary for ongoing production support, maintenance applications, and design continuity where existing inventory requires replenishment or replacement.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.7	V @ 1 A
Reverse Recovery Time (trr)	75	ns
Current - Reverse Leakage @ Vr	5	µA @ 800 V
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the HS1K rectifier diode is determined by strict equivalence across the following critical electrical parameters: maximum reverse voltage (800V), average rectified current (1A), forward voltage drop (1.7V @ 1A), and reverse recovery time performance (fast recovery ≤ 500ns). Mechanical compatibility requires surface mount technology with compatible package footprints. All substitute parts must maintain RoHS3 compliance and operate within the specified junction temperature range.

Two substitute parts are identified based on these criteria:

HS1KLW (Manufacturer Recommended): Identical electrical specifications with improved performance characteristics including lower reverse leakage current (1µA vs. 5µA) and reduced junction capacitance (7pF vs. 15pF). Package variant is SOD-123W, which maintains the same footprint family as the original SOD-123. Product status is Active, ensuring ongoing availability.

US1K_R1_00001 (Similar Alternative): Meets all critical electrical parameters with package variant SMA (DO-214AC). Reverse recovery time is 100ns, which exceeds the fast recovery threshold but remains within acceptable limits for general rectification. Manufactured by Panjit International Inc. with Active product status.

Parameter Comparison

Parameter	HS1K	HS1KLW	US1K_R1_00001
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	Panjit International Inc.
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	800 V
Current - Average Rectified (Io)	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	1.7 V @ 1 A	1.7 V @ 1 A	1.7 V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Reverse Recovery Time (trr)	75 ns	75 ns	100 ns
Current - Reverse Leakage @ Vr	5 µA @ 800 V	1 µA @ 800 V	1 µA @ 800 V
Capacitance @ Vr, F	15 pF @ 4V, 1MHz	7 pF @ 4V, 1MHz	17 pF @ 4V, 1MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOD-123	SOD-123W	DO-214AC, SMA
Operating Temperature - Junction	-55 to 150 °C	-55 to 175 °C	-55 to 150 °C
Product Status	Not For New Designs	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute: HS1KLW

The HS1KLW is the manufacturer-recommended substitute for the HS1K. Both parts are manufactured by Taiwan Semiconductor Corporation and share identical electrical specifications for voltage, current, and forward voltage drop. The HS1KLW offers improved performance with reduced reverse leakage current and lower junction capacitance. The SOD-123W package is compatible with SOD-123 footprints in most PCB designs. The HS1KLW maintains Active product status, ensuring long-term availability and supply chain continuity. Extended operating temperature range (-55 to 175°C) provides additional thermal margin. Moisture Sensitivity Level (MSL) rating of 1 (Unlimited) indicates superior moisture resistance.

Secondary Substitute: US1K_R1_00001

The US1K_R1_00001 manufactured by Panjit International Inc. is a functional equivalent meeting all critical electrical parameters. This part is suitable for applications where the SMA (DO-214AC) package footprint is compatible with the PCB design. The 100ns reverse recovery time remains within fast recovery classification and is acceptable for general rectification circuits. Active product status ensures availability. This substitute is appropriate when PCB layout accommodates the larger SMA package or when supply constraints on the primary substitute exist.

Compliance Considerations

All three parts maintain ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for electronic component procurement. The HS1K's "Not For New Designs" status does not affect the suitability of its Active substitutes for ongoing production or maintenance applications.

Frequently Asked Questions (FAQ)

Q: Can the HS1KLW directly replace the HS1K without PCB modifications?

A: The HS1KLW uses the SOD-123W package variant, which is compatible with standard SOD-123 footprints on most PCBs. No modifications are required in typical applications. Verify footprint compatibility with your specific PCB design documentation.

Q: What is the difference between SOD-123 and SOD-123W packages?

A: Both packages are surface mount variants in the SOD family with similar footprint dimensions. SOD-123W is a wider variant of SOD-123. The HS1KLW (SOD-123W) is compatible with SOD-123 PCB layouts in standard applications.

Q: Why does the US1K_R1_00001 have a longer reverse recovery time (100ns vs. 75ns)?

A: The US1K_R1_00001 has a reverse recovery time of 100 nanoseconds, which still qualifies as fast recovery (≤ 500ns). This difference is acceptable for general-purpose rectification applications. Applications requiring the fastest switching performance should use the HS1KLW with 75ns recovery time.

Q: Are there package footprint differences between HS1KLW and US1K_R1_00001?

A: Yes. The HS1KLW uses SOD-123W package, while the US1K_R1_00001 uses SMA (DO-214AC) package. SMA is larger than SOD-123W. PCB layout compatibility must be verified before substitution. The HS1KLW is the preferred substitute for direct replacement in existing HS1K designs.

Q: What is the significance of the lower reverse leakage current in HS1KLW?

A: The HS1KLW exhibits 1µA reverse leakage current compared to 5µA in the HS1K. Lower reverse leakage reduces power dissipation and improves circuit efficiency, particularly in high-impedance applications or circuits operating at elevated temperatures.

Q: Can I use US1K_R1_00001 if HS1KLW is unavailable?

A: Yes. The US1K_R1_00001 meets all critical electrical specifications (800V, 1A, 1.7V forward voltage, fast recovery). Verify that your PCB design accommodates the SMA (DO-214AC) package footprint, which is larger than SOD-123W.

Q: Are all three parts RoHS compliant?

A: Yes. The HS1K, HS1KLW, and US1K_R1_00001 are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory standards for electronic components.

Q: What is the operating temperature range difference between HS1KLW and the original HS1K?

A: The HS1KLW operates from -55 to 175°C, while the HS1K operates from -55 to 150°C. The HS1KLW provides an additional 25°C of upper temperature margin, beneficial for applications in high-temperature environments.

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