SS14LH Equivalent & Substitute Parts

Part Overview

The SS14LH is a 1A, 40V Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, housed in a SOD-123 surface mount package. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. The part is automotive-grade with AEC-Q101 qualification and is ROHS3 compliant. Due to its obsolescence status, identification of functionally equivalent substitute components is necessary for ongoing production support and design continuity.

Substiute Parts

SS14LH

Taiwan Semiconductor CorporationIn Stock: 849SS14LH Datasheet

Current PartRFQ

SS14LWH

Taiwan Semiconductor CorporationIn Stock: 39889SS14LWH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS14LH is determined by electrical and mechanical parameter compatibility within the Schottky rectifier diode category. The critical parameters governing substitution are:

Electrical Parameters:

• Reverse voltage rating (Vr): 40 V maximum
• Average rectified current (Io): 1 A
• Forward voltage drop (Vf): 550 mV maximum at 1 A
• Recovery speed: Fast Recovery ≤ 500ns, > 200mA
• Reverse leakage current: specified at rated voltage

Mechanical Parameters:

• Surface mount technology
• Package compatibility: SOD-123 or equivalent footprint variants
• Operating temperature range: minimum -55°C to 125°C

The SS14LWH qualifies as a direct substitute based on matching electrical specifications and surface mount technology. Both components share identical voltage ratings, current ratings, forward voltage characteristics, and recovery speed classifications. The primary distinction is the package variant (SOD-123W versus SOD-123) and improved reverse leakage performance in the substitute part.

Parameter Comparison

Engineering Selection Recommendations

The SS14LWH is the manufacturer-recommended substitute for the SS14LH. Both components are ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements. The SS14LWH maintains all critical electrical specifications: 40 V reverse voltage, 1 A average rectified current, 550 mV forward voltage drop, and fast recovery characteristics.

The SS14LWH offers operational advantages over the SS14LH:

• Active Product Status: The SS14LWH is in active production, ensuring long-term availability and supply chain stability, whereas the SS14LH is designated "Not For New Designs."
• Improved Reverse Leakage: The SS14LWH exhibits 100 µA reverse leakage at 40 V compared to 400 µA in the SS14LH, representing a 75% reduction in leakage current.
• Extended Temperature Range: The SS14LWH supports -55°C to 150°C junction temperature operation, providing 25°C additional high-temperature margin beyond the SS14LH specification.
• Package Variant: The SOD-123W package is a surface mount variant compatible with standard PCB assembly processes.

Selection of the SS14LWH is appropriate for applications requiring Schottky rectification at 40 V and 1 A with automotive-grade reliability and compliance certification.

Frequently Asked Questions (FAQ)

Q: Can the SS14LWH directly replace the SS14LH in existing designs?

A: The SS14LWH is electrically equivalent to the SS14LH across all critical parameters: reverse voltage, forward current, forward voltage drop, and recovery speed. The primary consideration is package footprint compatibility. The SS14LH uses SOD-123 packaging while the SS14LWH uses SOD-123W packaging. PCB layout verification is required to confirm footprint compatibility before implementation.

Q: What is the significance of the "Not For New Designs" status on the SS14LH?

A: This designation indicates the SS14LH has been superseded by the manufacturer and is no longer recommended for new product development. The SS14LWH represents the active replacement in the manufacturer's product portfolio. Existing inventory of SS14LH may be available for legacy production support, but new designs should incorporate the SS14LWH.

Q: Are there differences in reliability or qualification between these parts?

A: Both components are manufactured by Taiwan Semiconductor Corporation and are ROHS3 compliant. The SS14LH carries AEC-Q101 automotive qualification. The SS14LWH's qualification status is not specified in the provided data. Confirmation of automotive-grade certification for the SS14LWH should be obtained from the manufacturer if AEC-Q101 compliance is a design requirement.

Q: What does the improved reverse leakage specification mean for circuit performance?

A: The SS14LWH exhibits 100 µA reverse leakage at 40 V compared to 400 µA in the SS14LH. Lower reverse leakage reduces parasitic current paths in the circuit, improving efficiency and reducing power dissipation in applications sensitive to leakage current, such as precision rectification or low-power standby circuits.

Q: Is the extended temperature range of the SS14LWH (-55°C to 150°C) a requirement for substitution?

A: The extended temperature range is not a substitution requirement but an additional capability. If the application operates within the SS14LH temperature range (-55°C to 125°C), both parts are functionally equivalent. The SS14LWH provides additional margin for applications approaching the upper temperature limit or operating in high-temperature environments.

Q: What packaging considerations apply when switching from SS14LH to SS14LWH?

A: The SS14LH uses SOD-123 packaging while the SS14LWH uses SOD-123W packaging. Both are surface mount packages with similar form factors, but the SOD-123W variant may have slightly different pad dimensions. PCB artwork and assembly process parameters must be verified against the specific package datasheet to ensure proper solder joint formation and component placement.