SS24LH Equivalent & Substitute Parts

Part Overview

The SS24LH is a 2A, 40V Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, designed for surface mount applications in the SOD-123 package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The part carries automotive-grade qualification (AEC-Q101) and is RoHS3 compliant. Due to its discontinued status, identifying functionally equivalent substitute components is essential for ongoing production support, maintenance, and legacy system repairs.

Substiute Parts

SS24LH

Taiwan Semiconductor CorporationIn Stock: 902SS24LH Datasheet

Current PartRFQ

SS24LWH

Taiwan Semiconductor CorporationIn Stock: 29124SS24LWH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS24LH is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 40 V
• Current - Average Rectified (Io): 2 A
• Technology: Schottky
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Operating Temperature - Junction: -55°C to 125°C

Mechanical Equivalence Criteria:

• Mounting Type: Surface Mount
• Base Product Number: SS24

Compliance Criteria:

• RoHS3 Compliant
• Automotive Grade
• AEC-Q101 Qualification

The SS24LWH meets all substitution criteria. While it features a different package variant (SOD-123W versus SOD-123) and exhibits minor variations in forward voltage and reverse leakage specifications, these differences remain within acceptable operational tolerances for the SS24 base product family. The SS24LWH maintains active product status, ensuring continued availability and supply chain support.

Parameter Comparison

Engineering Selection Recommendations

The SS24LWH is the direct substitute for the SS24LH based on electrical and mechanical equivalence within the SS24 base product family. Selection of the SS24LWH is supported by the following factors:

Compliance and Certification: The SS24LWH maintains identical automotive-grade qualification (AEC-Q101) and RoHS3 compliance status, ensuring regulatory and quality standards are preserved in applications requiring these certifications.

Product Status: The SS24LWH carries active product status, providing assured supply chain continuity and manufacturing support. This addresses the obsolescence risk associated with the SS24LH's "Not For New Designs" classification.

Electrical Performance: Both devices operate within the same voltage and current ratings (40V, 2A) with identical fast recovery characteristics. The SS24LWH exhibits a 50 mV increase in forward voltage drop and a 200 µA reduction in reverse leakage current. These variations are characteristic of manufacturing process improvements and do not compromise functional equivalence.

Package Consideration: The SS24LWH uses the SOD-123W package variant instead of SOD-123. Physical footprint compatibility must be verified against printed circuit board layout specifications prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can the SS24LWH be used as a direct replacement for the SS24LH in existing designs?

A: The SS24LWH is electrically and functionally equivalent to the SS24LH across all critical parameters: 40V reverse voltage, 2A average rectified current, Schottky technology, and fast recovery characteristics. Both devices operate across the identical temperature range (-55°C to 125°C) and maintain automotive-grade AEC-Q101 qualification. Physical package compatibility (SOD-123W versus SOD-123) must be confirmed for the specific application.

Q: What is the significance of the forward voltage difference between SS24LH and SS24LWH?

A: The SS24LWH exhibits a maximum forward voltage of 550 mV at 2A compared to 500 mV for the SS24LH, representing a 50 mV increase. This difference reflects manufacturing process variations within the Schottky diode family and does not affect functional substitution. Circuit designs must accommodate this specification within their power dissipation and voltage drop budgets.

Q: Why does the SS24LWH have lower reverse leakage current than the SS24LH?

A: The SS24LWH demonstrates 200 µA reverse leakage at 40V compared to 400 µA for the SS24LH. This improvement is typical of process refinements in active product lines and represents enhanced device performance. Lower reverse leakage reduces standby power consumption and improves overall circuit efficiency.

Q: Are there package compatibility concerns when substituting SS24LWH for SS24LH?

A: Yes. The SS24LH uses SOD-123 packaging while the SS24LWH uses SOD-123W packaging. Although both are surface mount packages, physical dimensions and footprint layouts differ. Printed circuit board design files and assembly specifications must be reviewed to confirm mechanical compatibility before implementation.

Q: Does the SS24LWH maintain the same compliance certifications as the SS24LH?

A: Yes. The SS24LWH is RoHS3 compliant, automotive-grade, and AEC-Q101 qualified, identical to the SS24LH. Both devices carry Moisture Sensitivity Level 1 (Unlimited) classification. Regulatory and quality requirements are fully preserved with this substitution.

Q: Why is the SS24LH marked "Not For New Designs"?

A: This designation indicates the SS24LH has reached end-of-life status and is no longer recommended for new product development. The SS24LWH, with active product status, is the appropriate choice for ongoing and future applications requiring this functional specification.