SS22LH Equivalent & Substitute Parts

Part Overview

The SS22LH is a 2A, 20V 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 This component is classified as not for new designs, indicating it has been superseded in the manufacturer's product line.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 carries automotive-grade qualification (AEC-Q101) and is RoHS3 compliant. Due to its discontinued status for new applications, identifying functionally compatible substitute components is essential for ongoing maintenance, repair, and legacy system support.

Substiute Parts

SS22LH

Taiwan Semiconductor CorporationIn Stock: 1111SS22LH Datasheet

Current PartRFQ

SS24LWH

Taiwan Semiconductor CorporationIn Stock: 29124SS24LWH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS22LH is determined by the following critical parameters:

Current Rating: The substitute must support a minimum average rectified current (Io) of 2A to maintain circuit functionality.

Voltage Rating: The substitute must have a DC reverse voltage (Vr) rating equal to or greater than 20V. Higher voltage ratings provide additional design margin and are acceptable for direct substitution.

Technology: The substitute must be a Schottky rectifier diode to maintain the fast recovery characteristics and forward voltage performance of the original circuit.

Mounting Type and Package: The substitute must be surface mount compatible. Package variations (SOD-123 versus SOD-123W) are acceptable provided the physical footprint accommodates the printed circuit board layout.

Temperature Range: The substitute must support the operating temperature range of -55°C to 125°C junction temperature.

Compliance: The substitute must maintain RoHS3 compliance and automotive-grade qualification where the original application requires these certifications.

The SS24LWH meets all substitution criteria through equivalent current and temperature specifications, higher voltage rating (40V), and compatible surface mount packaging in the SOD-123W variant.

Parameter Comparison

Engineering Selection Recommendations

The SS24LWH is the manufacturer-recommended substitute for the SS22LH. Selection of this substitute is based on the following engineering criteria:

Product Status: The SS22LH is designated as not for new designs, whereas the SS24LWH maintains active production status. This ensures long-term availability and supply chain continuity for ongoing applications.

Electrical Compatibility: The SS24LWH maintains the 2A current rating and identical fast recovery characteristics required by circuits designed for the SS22LH. The 40V reverse voltage rating of the SS24LWH exceeds the 20V requirement of the original part, providing additional design margin without circuit modification.

Compliance and Certification: Both parts maintain RoHS3 compliance and automotive-grade qualification. The SS24LWH carries AEC-Q101 qualification consistent with the original part's automotive requirements.

Package Consideration: The SS24LWH uses the SOD-123W package variant rather than the SOD-123 package of the original part. Physical footprint verification against the printed circuit board layout is required prior to implementation.

Forward Voltage: The SS24LWH exhibits a maximum forward voltage of 550 mV at 2A, compared to 500 mV for the SS22LH. This 50 mV difference is within typical design tolerance for Schottky rectifier applications and does not require circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can the SS24LWH be used as a direct replacement for the SS22LH without circuit modification?

A: The SS24LWH is electrically compatible with the SS22LH for circuits operating at or below 20V. The higher 40V rating of the substitute provides additional margin. Physical footprint compatibility must be confirmed, as the SS24LWH uses the SOD-123W package variant rather than the SOD-123 package of the original part.

Q: What is the significance of the higher voltage rating on the SS24LWH?

A: The 40V reverse voltage rating of the SS24LWH exceeds the 20V requirement of the SS22LH. This higher rating is acceptable for direct substitution in 20V circuits and provides additional design margin against voltage transients without requiring circuit modification.

Q: How does the forward voltage difference between these parts affect circuit performance?

A: The SS24LWH has a maximum forward voltage of 550 mV at 2A, compared to 500 mV for the SS22LH. This 50 mV difference is typical among Schottky rectifier variants and falls within standard design tolerance for most rectifier applications. Circuit redesign is not required.

Q: Are there package compatibility concerns between SOD-123 and SOD-123W?

A: SOD-123 and SOD-123W are related but distinct package variants. Physical dimensions and PCB footprint requirements differ. Verify that the printed circuit board layout accommodates the SOD-123W package before implementing the SS24LWH as a substitute.

Q: Does the SS24LWH maintain the same automotive qualification as the SS22LH?

A: Yes. The SS24LWH carries AEC-Q101 automotive qualification and maintains RoHS3 compliance, consistent with the original SS22LH specifications.

Q: Why is the reverse leakage current lower on the SS24LWH despite its higher voltage rating?

A: The SS24LWH exhibits 200 µA reverse leakage at 40V, compared to 400 µA for the SS22LH at 20V. This difference reflects the distinct semiconductor design and manufacturing process of the two parts. Both values are within acceptable limits for Schottky rectifier applications.

Q: Is the SS24LWH the only available substitute for the SS22LH?

A: According to the manufacturer data provided, the SS24LWH is the designated substitute for the SS22LH. This substitution is based on electrical compatibility, current rating equivalence, and active product status.