SS310LH Equivalent & Substitute Parts

Part Overview

The SS310LH is a 3A, 100V 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 design continuity, maintenance, and repair applications where the original part is no longer readily available through standard procurement channels.

Substiute Parts

SS310LH

Taiwan Semiconductor CorporationIn Stock: 1100SS310LH Datasheet

Current PartRFQ

SS310LWH

Taiwan Semiconductor CorporationIn Stock: 20379SS310LWH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS310LH is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Parameters (Must Match):

• Voltage - DC Reverse (Vr) (Max): 100 V
• Current - Average Rectified (Io): 3 A
• Voltage - Forward (Vf) (Max) @ If: 850 mV @ 3 A
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Operating Temperature - Junction: -55°C to 150°C
• Technology: Schottky

Mechanical Parameters (Must Match):

• Mounting Type: Surface Mount
• Technology Classification: Schottky rectifier diode

Compliance Parameters (Must Match or Exceed):

• RoHS Status: ROHS3 Compliant
• Grade: Automotive
• Qualification: AEC-Q101

The SS310LWH qualifies as a direct substitute based on identical electrical ratings, matching temperature range, equivalent forward voltage characteristics, and identical fast recovery speed specifications. The substitute maintains automotive-grade qualification and ROHS3 compliance. Package variation (SOD-123W versus SOD-123) represents a mechanical accommodation within the same component family and does not affect electrical substitutability.

Parameter Comparison

Engineering Selection Recommendations

The SS310LWH is the designated manufacturer-recommended substitute for the SS310LH. Selection of this substitute is supported by the following engineering criteria:

Electrical Equivalence: The SS310LWH maintains identical voltage ratings (100 V reverse, 850 mV forward @ 3 A), current capacity (3 A average rectified), and fast recovery speed characteristics (≤ 500ns, > 200mA). These parameters ensure direct functional replacement in existing circuit designs without modification.

Compliance and Certification: Both components carry automotive-grade qualification (AEC-Q101) and ROHS3 compliance, meeting regulatory and quality standards for automotive and industrial applications. The substitute does not introduce compliance risk.

Product Status Advantage: The SS310LWH holds "Active" product status, ensuring continued availability and supply chain stability, whereas the SS310LH is classified as "Not For New Designs" and subject to discontinuation. This status differential makes the substitute the appropriate choice for ongoing procurement.

Reverse Leakage Improvement: The SS310LWH exhibits superior reverse leakage characteristics (20 µA @ 100 V versus 100 µA @ 100 V), representing an improvement in leakage performance that does not compromise compatibility.

Package Accommodation: The SOD-123W package variant accommodates the same surface mount assembly process and footprint compatibility with standard pick-and-place equipment used for SOD-123 components.

Frequently Asked Questions (FAQ)

Q: Can the SS310LWH be used as a direct replacement for the SS310LH without circuit modification?

A: Yes. The SS310LWH is electrically equivalent to the SS310LH across all critical parameters: reverse voltage (100 V), forward current (3 A), forward voltage drop (850 mV @ 3 A), and recovery speed (≤ 500ns). No circuit redesign is required.

Q: What is the difference between the SOD-123 and SOD-123W packages?

A: SOD-123W is a wider variant of the SOD-123 package. Both are surface mount packages suitable for automated assembly. The SOD-123W accommodates the same electrical specifications and is compatible with standard surface mount manufacturing processes.

Q: Why is the SS310LH marked "Not For New Designs"?

A: This designation indicates the part has reached end-of-life status and is no longer recommended for new product development. Existing inventory may remain available, but long-term supply cannot be guaranteed. The SS310LWH, with "Active" status, is the appropriate selection for ongoing applications.

Q: Does the lower reverse leakage of the SS310LWH (20 µA vs. 100 µA) affect compatibility?

A: No. Lower reverse leakage is a performance improvement that enhances circuit reliability and reduces power dissipation. It does not introduce incompatibility with designs specified for the SS310LH.

Q: Are both parts qualified for automotive applications?

A: Yes. Both the SS310LH and SS310LWH carry automotive-grade qualification (AEC-Q101) and are suitable for automotive and industrial applications requiring this certification level.

Q: What is the inventory status of these parts?

A: The SS310LH has 1,075 pieces in stock (new original). The SS310LWH has 20,298 pieces in stock (new original), providing significantly greater availability for procurement.

Q: Are there any moisture sensitivity considerations for the SS310LWH?

A: The SS310LWH carries Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.