SS34LHE-TP Equivalent & Substitute Parts

Part Overview

The SS34LHE-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 40 V DC reverse voltage and 3 A average rectified current in a surface mount SOD-123HE package. This component is classified as Obsolete, necessitating identification of equivalent substitute parts for ongoing production and maintenance applications. Equivalent parts must maintain electrical performance characteristics and mechanical compatibility while accommodating available inventory and product lifecycle status.

Substiute Parts

SS34LHE-TP

Micro Commercial CoIn Stock: 714SS34LHE-TP Datasheet

Current PartRFQ

SS34FA

onsemiIn Stock: 23210SS34FA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS34LHE-TP is determined by strict equivalence of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 40 V
• Current - Average Rectified (Io): 3 A
• Technology: Schottky
• Mounting Type: Surface Mount
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 500 µA @ 40 V

Package Compatibility Consideration: The SS34LHE-TP uses SOD-123HE packaging. Substitute parts may employ related SOD-123 variants (SOD-123FA, SOD-123W) provided all electrical parameters remain within specified tolerances and the physical footprint accommodates board-level integration.

Compliance Requirements: All substitute parts must maintain RoHS3 compliance and MSL Level 1 rating to ensure environmental and moisture handling compatibility.

Parameter Comparison

Engineering Selection Recommendations

SS34FA (onsemi) as Primary Substitute:

The SS34FA meets all critical electrical parameters specified for the SS34LHE-TP. Both devices are Schottky rectifier diodes with identical 40 V reverse voltage rating, 3 A average rectified current, and fast recovery speed characteristics. Forward voltage specification of the SS34FA (500 mV @ 3 A) is within acceptable tolerance relative to the main part (450 mV @ 3 A), representing a 50 mV differential that remains within typical Schottky diode performance variation.

The SS34FA carries AEC-Q101 automotive qualification and is manufactured by onsemi, a primary semiconductor supplier with established supply chain presence. Although classified as "Not For New Designs," the part maintains active inventory (23,200 units) and full RoHS3 compliance.

Package Consideration:

The SS34FA employs SOD-123FA packaging versus the SOD-123HE of the main part. Both are surface mount variants within the SOD-123 family. Physical footprint compatibility must be confirmed at the board design level, as SOD-123W and SOD-123H variants may present minor dimensional differences in lead configuration and body dimensions.

Temperature Operating Range:

The SS34FA specifies a maximum junction temperature of 125°C compared to 150°C for the SS34LHE-TP. Applications requiring sustained operation above 125°C require thermal analysis to confirm the substitute part remains within safe operating limits.

Compliance Status:

Both parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can the SS34FA directly replace the SS34LHE-TP in all applications?

A: The SS34FA matches all critical electrical specifications (40 V, 3 A, Schottky technology, fast recovery speed). However, package variant differences (SOD-123FA versus SOD-123HE) require confirmation of physical footprint compatibility on the target PCB. Additionally, the reduced maximum junction temperature (125°C versus 150°C) must be evaluated for applications operating at elevated temperatures.

Q: What is the significance of the forward voltage difference between the two parts?

A: The SS34FA specifies 500 mV forward voltage at 3 A compared to 450 mV for the SS34LHE-TP. This 50 mV difference is typical within Schottky diode manufacturing tolerances and does not constitute a functional incompatibility. Circuit designs should accommodate this variation within normal component tolerance budgets.

Q: Why is the SS34FA classified as "Not For New Designs" if it is a suitable substitute?

A: Product lifecycle status reflects manufacturer design recommendations for new product development. The "Not For New Designs" designation does not indicate functional inadequacy but rather signals that the manufacturer may discontinue the part or has released newer alternatives. For replacement and maintenance applications, the SS34FA remains a valid electrical equivalent.

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

A: Both SOD-123HE and SOD-123FA are surface mount packages within the SOD-123 family. Physical dimensions and lead configurations may differ slightly. PCB footprint verification is required to ensure the substitute part accommodates existing board layouts without design modification.

Q: What inventory considerations apply to substitution?

A: The SS34LHE-TP is classified as Obsolete with 675 units in stock. The SS34FA is actively stocked with 23,200 units available, providing superior supply chain continuity for ongoing production requirements.

Q: Does the SS34FA carry any additional certifications relevant to specific applications?

A: The SS34FA carries AEC-Q101 automotive qualification, indicating suitability for automotive-grade applications. This certification is not specified for the SS34LHE-TP and may provide additional assurance for applications requiring automotive-level reliability standards.