HS1DL Equivalent & Substitute Parts

Part Overview

The HS1DL is a fast recovery rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 200 V DC reverse voltage and 1 A average rectified current. This component is classified as a standard technology surface mount diode in the SOD-123 package. The HS1DL carries a "Not For New Designs" product status, indicating that this part number is no longer recommended for new circuit development. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and transition to actively supported alternatives that meet the same electrical and mechanical requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	mV
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 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 HS1DL is determined by strict equivalence across the following critical parameters:

Reverse Voltage Rating: 200 V DC maximum
Forward Current Rating: 1 A average rectified current
Recovery Speed Classification: Fast recovery with reverse recovery time ≤ 500 ns at currents > 200 mA
Reverse Recovery Time: 50 ns
Mounting Technology: Surface mount configuration
Package Compatibility: SOD-123 or mechanically compatible variants
Regulatory Compliance: ROHS3 and REACH status alignment

The HS1DLW qualifies as a direct substitute based on matching all critical electrical parameters and maintaining surface mount compatibility. The primary distinction is the package variant (SOD-123W versus SOD-123) and improved product status (Active versus Not For New Designs).

Parameter Comparison

Parameter	HS1DL	HS1DLW	Unit
Manufacturer	Taiwan Semiconductor Corporation	Taiwan Semiconductor Corporation	—
Category	Diodes, Rectifiers	Diodes, Rectifiers	—
Voltage - DC Reverse (Vr) (Max)	200	200	V
Current - Average Rectified (Io)	1	1	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	1 V @ 1 A	mV
Reverse Recovery Time (trr)	50	50	ns
Current - Reverse Leakage @ Vr	5 µA @ 200 V	1 µA @ 200 V	µA
Capacitance @ Vr, F	20 pF @ 4V, 1MHz	16 pF @ 4V, 1MHz	pF
Mounting Type	Surface Mount	Surface Mount	—
Package / Case	SOD-123	SOD-123W	—
Operating Temperature - Junction	-55 to 150	-55 to 175	°C
Product Status	Not For New Designs	Active	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	—
REACH Status	REACH Unaffected	REACH Unaffected	—

Engineering Selection Recommendations

The HS1DLW is the primary substitute for the HS1DL based on the following engineering criteria:

Product Status Alignment: The HS1DLW carries an Active product status, whereas the HS1DL is designated Not For New Designs. This distinction makes the HS1DLW the appropriate choice for ongoing production and new circuit implementations.

Electrical Equivalence: Both parts maintain identical reverse voltage (200 V), forward current (1 A), and reverse recovery time (50 ns) specifications. The HS1DLW exhibits improved reverse leakage characteristics (1 µA versus 5 µA at 200 V) and lower junction capacitance (16 pF versus 20 pF), representing performance enhancements within the same functional class.

Regulatory Compliance: Both parts satisfy ROHS3 and REACH requirements, ensuring compliance with current environmental and hazardous substance directives.

Temperature Performance: The HS1DLW supports an extended maximum junction temperature of 175°C compared to the HS1DL at 150°C, providing additional thermal margin in high-temperature applications.

Package Consideration: The HS1DLW uses the SOD-123W package variant. PCB layout and footprint compatibility must be verified prior to implementation, as SOD-123W dimensions differ from the standard SOD-123 package.

Frequently Asked Questions (FAQ)

Q: Can the HS1DLW directly replace the HS1DL in existing designs?

A: Electrical substitution is valid based on matching voltage, current, and recovery time specifications. However, the SOD-123W package footprint differs from SOD-123, requiring PCB layout verification and potential rework of solder pads and trace routing.

Q: What is the significance of the "Not For New Designs" status on the HS1DL?

A: This designation indicates that Taiwan Semiconductor Corporation no longer recommends the HS1DL for new circuit development. The HS1DLW is the active alternative and should be used for all new designs to ensure long-term supply availability and manufacturer support.

Q: Are there performance differences between the HS1DL and HS1DLW?

A: Both parts meet the same core electrical specifications (200 V, 1 A, 50 ns recovery). The HS1DLW demonstrates lower reverse leakage current (1 µA versus 5 µA) and reduced junction capacitance (16 pF versus 20 pF), representing marginal improvements. Forward voltage differs slightly (1 V versus 950 mV at 1 A), which is within typical manufacturing tolerance ranges for this device class.

Q: What package compatibility issues should be considered?

A: The HS1DL uses SOD-123 packaging, while the HS1DLW uses SOD-123W. These packages have different physical dimensions and pad layouts. Verify that the PCB footprint accommodates the SOD-123W package before substitution. Existing SOD-123 footprints may require modification.

Q: Is the extended temperature range of the HS1DLW (-55 to 175°C versus -55 to 150°C) significant?

A: The HS1DLW provides an additional 25°C of maximum junction temperature capability. This is beneficial in applications operating near thermal limits, though it does not affect electrical performance in standard temperature environments.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both the HS1DL and HS1DLW are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance restrictions.

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