SS34HT-TP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS34HT-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 40V DC reverse voltage and 3A average rectified current in a surface mount SOD-123HT package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The part maintains ROHS3 compliance and unlimited moisture sensitivity rating, making it suitable for industrial and commercial applications requiring fast recovery rectification.

Substiute Parts

SS34HT-TP

Micro Commercial CoIn Stock: 1128SS34HT-TP Datasheet

Current PartRFQ

SMD34PL-TP

Micro Commercial CoIn Stock: 7321SMD34PL-TP Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SS34HT-TP is determined by electrical and mechanical parameter equivalence within the Schottky diode rectifier category. The primary substitution criteria are:

Electrical Parameters (Critical):

• Voltage - DC Reverse (Vr) (Max): 40V minimum
• Current - Average Rectified (Io): 3A minimum
• Technology: Schottky
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Operating Temperature Range: -55°C to 125°C minimum

Mechanical Parameters (Critical):

• Mounting Type: Surface Mount
• Package compatibility: SOD-123 series variants

Compliance Parameters:

• RoHS3 Compliance required
• Moisture Sensitivity Level: 1 (Unlimited)

The SMD34PL-TP meets all critical electrical and mechanical substitution criteria, with identical voltage and current ratings, matching temperature range, and equivalent fast recovery speed specification. Package variant differences (SOD-123HT vs. SOD-123FL) represent acceptable mechanical substitution within the SOD-123 family for surface mount applications.

Parameter Comparison

Engineering Selection Recommendations

The SMD34PL-TP is the qualified substitute for the obsolete SS34HT-TP based on the following engineering criteria:

Electrical Equivalence: Both parts maintain identical voltage and current ratings (40V, 3A) with matching fast recovery speed specifications. The SMD34PL-TP demonstrates improved forward voltage characteristics (500 mV vs. 550 mV @ 3A) and lower reverse leakage current (100 µA @ 60V vs. 200 µA @ 40V), representing performance enhancement rather than degradation.

Compliance Alignment: Both parts are ROHS3 compliant with unlimited moisture sensitivity rating (MSL 1), ensuring equivalent environmental and regulatory compliance for industrial applications.

Product Status: The SMD34PL-TP is active production status, providing supply continuity and long-term availability compared to the obsolete SS34HT-TP. This substitution addresses obsolescence risk while maintaining full electrical and mechanical compatibility.

Package Consideration: The SOD-123F package variant (SMD34PL-TP) is mechanically compatible with SOD-123T footprints (SS34HT-TP) in surface mount applications. Both packages conform to SOD-123 family specifications for PCB layout and assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SMD34PL-TP directly replace the SS34HT-TP in existing designs?

A: Yes. The SMD34PL-TP meets all critical electrical parameters (40V, 3A, fast recovery Schottky) and operates within the identical temperature range (-55°C to 125°C). Both parts are surface mount with SOD-123 family package compatibility. PCB layout and assembly processes require no modification.

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

A: Both are surface mount SOD-123 family packages with equivalent footprint compatibility for PCB assembly. The designations (HT vs. FL) indicate manufacturer-specific package variants. Physical dimensions and lead configurations remain compatible within the SOD-123 standard for reflow soldering processes.

Q: Are there performance differences between these parts?

A: The SMD34PL-TP demonstrates improved electrical characteristics: forward voltage is 50 mV lower (500 mV vs. 550 mV @ 3A) and reverse leakage current is reduced (100 µA @ 60V vs. 200 µA @ 40V). These represent performance enhancements that do not affect circuit compatibility.

Q: Why is the SS34HT-TP obsolete?

A: The SS34HT-TP is classified as obsolete by the manufacturer. The SMD34PL-TP provides equivalent functionality with active production status, ensuring supply availability and long-term component sourcing for new and ongoing production.

Q: Do both parts require the same PCB footprint?

A: Yes. Both parts use surface mount SOD-123 family packages with compatible PCB footprints. No design modifications are required for footprint or assembly process changes.

Q: Are compliance certifications identical?

A: Yes. Both parts are ROHS3 compliant with MSL 1 (unlimited moisture sensitivity). Regulatory and environmental compliance requirements are equivalent.

Q: What is the reverse leakage current specification difference?

A: The SS34HT-TP specifies 200 µA @ 40V, while the SMD34PL-TP specifies 100 µA @ 60V. The SMD34PL-TP demonstrates lower leakage at a higher voltage reference, indicating improved leakage performance.