Equivalent & Substitute Parts for 1SS389-G Schottky Diode

Part Overview

The 1SS389-G is a Schottky diode manufactured by Comchip Technology, rated for 10V DC reverse voltage with 100mA average rectified current in a surface mount SOD-523 package. This component is classified as obsolete, which necessitates identification of active equivalent parts to maintain design continuity and ensure supply chain availability for new production and repair applications.

Substiute Parts

1SS389-G

Comchip TechnologyIn Stock: 16691SS389-G Datasheet

Current PartRFQ

1SS389-HF

Comchip TechnologyIn Stock: 7451SS389-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1SS389-G is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 10 V
• Current - Average Rectified (Io): 100 mA
• Voltage - Forward (Vf) (Max) @ If: 500 mV @ 100 mA
• Current - Reverse Leakage @ Vr: 20 µA @ 10 V
• Technology: Schottky
• Package / Case: SC-79, SOD-523
• Mounting Type: Surface Mount

The 1SS389-HF meets all mandatory electrical and mechanical parameters required for direct substitution. Both parts share identical voltage ratings, current specifications, forward voltage characteristics, and reverse leakage performance. Both are housed in the SOD-523 surface mount package with identical pinout and footprint compatibility.

Parameter Comparison

Engineering Selection Recommendations

The 1SS389-HF is the direct equivalent substitute for the obsolete 1SS389-G. Both parts are manufactured by Comchip Technology and share identical electrical specifications across all critical parameters: reverse voltage, forward current, forward voltage drop, and reverse leakage current.

The 1SS389-HF offers two additional advantages:

Product Status: The 1SS389-HF maintains active production status, ensuring long-term supply chain availability and compatibility with current manufacturing processes.

Operating Temperature Range: The 1SS389-HF extends the maximum junction temperature to 125°C, compared to 100°C for the 1SS389-G, providing enhanced thermal margin in applications operating at elevated temperatures.

Capacitance Characteristic: The 1SS389-HF exhibits lower junction capacitance (20 pF versus 40 pF at 0V, 1MHz), which may provide improved high-frequency performance in switching applications, though both values remain within the small-signal diode classification.

The 1SS389-HF is suitable for direct replacement in all applications previously designed with the 1SS389-G without circuit modification or re-qualification.

Frequently Asked Questions (FAQ)

Q: Can the 1SS389-HF directly replace the 1SS389-G without circuit changes?

A: Yes. The 1SS389-HF meets all electrical and mechanical specifications of the 1SS389-G. Both parts share identical voltage ratings (10V), current ratings (100mA), forward voltage characteristics (500mV @ 100mA), and reverse leakage performance (20µA @ 10V). The SOD-523 package footprint and pinout are identical, enabling direct PCB substitution.

Q: What is the difference in capacitance between these parts?

A: The 1SS389-G has 40 pF junction capacitance at 0V and 1MHz, while the 1SS389-HF has 20 pF under the same conditions. This difference may affect switching speed in high-frequency applications, with the 1SS389-HF offering faster switching characteristics. Both values are consistent with small-signal Schottky diode performance.

Q: Why is the 1SS389-G listed as obsolete?

A: The 1SS389-G has been discontinued by Comchip Technology. The 1SS389-HF is the active production equivalent that replaces it in the manufacturer's product line.

Q: Are there any compliance or certification differences?

A: The 1SS389-G is specified as ROHS3 Compliant and REACH Unaffected. Compliance information for the 1SS389-HF is not provided in the available specifications. Verify current compliance status with the manufacturer or authorized distributor for new designs.

Q: What is the temperature operating range for each part?

A: The 1SS389-G operates from -40°C to 100°C junction temperature. The 1SS389-HF extends this range to -40°C to 125°C, providing 25°C additional thermal headroom for high-temperature applications.

Q: Are both parts available in the same packaging format?

A: Yes. Both the 1SS389-G and 1SS389-HF use the SC-79 / SOD-523 surface mount package. Mechanical dimensions, lead configuration, and PCB footprint are identical.