HS1AL Equivalent & Substitute Parts

Part Overview

The HS1AL is a fast recovery rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 50 V DC reverse voltage and 1 A average rectified current. This surface mount component features a 50 ns reverse recovery time and is packaged in SOD-123 (Sub SMA) format. The HS1AL is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent substitute parts is necessary for applications requiring continued supply or design migration to active product lines.

Substiute Parts

HS1AL

Taiwan Semiconductor CorporationIn Stock: 20773HS1AL Datasheet

Current PartRFQ

HS1DLW

Taiwan Semiconductor CorporationIn Stock: 20844HS1DLW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HS1AL is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Current rating: Must equal or exceed 1 A average rectified current
• Reverse recovery time: Must equal or be faster than 50 ns
• Reverse leakage current: Must be equal to or lower than specified at rated voltage
• Forward voltage drop: Must not exceed application tolerance limits
• Operating temperature range: Must encompass the required junction temperature range

Mechanical Compatibility Criteria:

• Mounting type: Surface mount only
• Package format: SOD-123 or equivalent footprint-compatible packages
• Moisture sensitivity: MSL 1 (Unlimited) preferred for supply chain flexibility

Regulatory & Compliance Criteria:

• RoHS3 compliance required
• REACH unaffected status required

The HS1DLW qualifies as a substitute based on matching current rating, reverse recovery time, mounting type, and regulatory compliance. The substitute part operates at a higher reverse voltage rating (200 V vs. 50 V), which is acceptable for applications where the HS1AL's 50 V rating is sufficient, as the higher-rated component provides additional design margin.

Parameter Comparison

Engineering Selection Recommendations

HS1DLW as Primary Substitute:

The HS1DLW is the manufacturer-recommended substitute for the HS1AL. Both components share identical current ratings (1 A), reverse recovery time (50 ns), mounting type (surface mount), and regulatory compliance status (ROHS3 compliant, REACH unaffected, MSL 1).

The HS1DLW carries Active product status, ensuring continued availability and supply chain support, whereas the HS1AL is designated "Not For New Designs." This status difference makes the HS1DLW the appropriate choice for new designs and ongoing production requirements.

The HS1DLW operates at 200 V reverse voltage compared to the HS1AL's 50 V rating. This higher voltage rating is compatible with applications designed for the HS1AL, as the substitute provides additional reverse voltage margin without compromising performance in lower-voltage applications.

The HS1DLW features a slightly higher maximum forward voltage drop (1000 mV vs. 950 mV at 1 A) and lower reverse leakage current (1 µA at 200 V vs. 5 µA at 50 V). These parameter differences are within typical design tolerances for rectifier applications.

The HS1DLW operates across an extended temperature range (-55°C to 175°C vs. -55°C to 150°C), providing additional thermal margin for high-temperature applications.

Package format differs between the two parts: HS1AL uses SOD-123 (Sub SMA), while HS1DLW uses SOD-123W. PCB layout verification is required to confirm footprint compatibility before implementation.

Frequently Asked Questions (FAQ)

Q: Can the HS1DLW directly replace the HS1AL without circuit modifications?

A: The HS1DLW is electrically compatible with the HS1AL for applications where the HS1AL's 50 V reverse voltage rating is sufficient. The substitute's higher voltage rating (200 V) does not create incompatibility in lower-voltage circuits. However, PCB footprint verification is required, as the HS1DLW uses SOD-123W packaging versus the HS1AL's SOD-123 format. Confirm that the PCB layout accommodates the SOD-123W package dimensions before component substitution.

Q: What is the significance of the HS1AL's "Not For New Designs" status?

A: This designation indicates the HS1AL has reached end-of-life and is no longer recommended for new product development. Existing inventory may remain available for legacy system support, but long-term supply cannot be guaranteed. The HS1DLW, with Active status, is the appropriate selection for new designs and ongoing production.

Q: Are there electrical performance differences between the HS1AL and HS1DLW that affect circuit operation?

A: Both components share identical current ratings (1 A) and reverse recovery time (50 ns), which are the primary performance parameters for rectifier selection. The HS1DLW exhibits a 50 mV higher forward voltage drop (1000 mV vs. 950 mV at 1 A) and lower reverse leakage current (1 µA vs. 5 µA). These differences are within typical design tolerances and do not require circuit redesign for standard rectifier applications.

Q: What package compatibility considerations apply to substitution?

A: The HS1AL uses SOD-123 (Sub SMA) packaging, while the HS1DLW uses SOD-123W. Although both are surface mount packages in the SOD-123 family, physical dimensions differ. Verify that the PCB footprint, solder pad layout, and component placement accommodate the SOD-123W package before implementing the substitution. Consult the respective component datasheets for precise dimensional specifications.

Q: Do both components meet the same regulatory and compliance requirements?

A: Yes. Both the HS1AL and HS1DLW are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity ratings. Regulatory compliance is equivalent between the two parts, and no additional compliance verification is required for substitution.

Q: What is the impact of the HS1DLW's extended operating temperature range?

A: The HS1DLW operates from -55°C to 175°C, compared to the HS1AL's -55°C to 150°C range. This 25°C extension at the upper temperature limit provides additional thermal margin for applications operating in elevated-temperature environments. For applications within the HS1AL's original temperature range, the HS1DLW's extended range offers no additional benefit but introduces no compatibility issues.