SS34F-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS34F-HF is an active Schottky rectifier diode manufactured by Comchip Technology, rated for 40 V DC reverse voltage and 3 A average rectified current in a surface mount SMAF package. This component is designed for fast recovery applications requiring switching speeds of 500 ns or less at currents exceeding 200 mA. Substitute parts become necessary when primary inventory is unavailable, when supply chain optimization is required, or when design flexibility permits equivalent component selection within specified electrical and mechanical parameters.

Substiute Parts

SS34F-HF

Comchip TechnologyIn Stock: 895SS34F-HF Datasheet

Current PartRFQ

SK34A

Good-Ark SemiconductorIn Stock: 28852SK34A Datasheet

Parametric EquivalentRFQ

SK34AH

Taiwan Semiconductor CorporationIn Stock: 15877SK34AH Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SS34F-HF are qualified based on strict electrical and mechanical parameter matching within the Schottky diode rectifier category. The substitution logic is determined by the following critical parameters:

Electrical Parameters (Must Match):

• Voltage - DC Reverse (Vr) (Max): 40 V
• Current - Average Rectified (Io): 3 A
• Voltage - Forward (Vf) (Max) @ If: 550 mV @ 3 A
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Operating Temperature - Junction: -55°C to 150°C

Mechanical Parameters (Must Match):

• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Technology: Schottky

Compliance Parameters:

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The substitute parts SK34A and SK34AH meet all critical electrical and mechanical requirements for direct substitution. Minor variations in reverse leakage current and capacitance specifications remain within acceptable tolerances for this component category and do not preclude functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

SS34F-HF (Comchip Technology): Primary component selection when Comchip inventory is available. Active product status with ROHS3 compliance and unlimited moisture sensitivity rating. Suitable for standard industrial applications.

SK34A (Good-Ark Semiconductor): Qualified substitute with automotive-grade designation and AEC-Q101 qualification. Lower reverse leakage current (200 µA vs. 500 µA) provides enhanced performance margin in applications sensitive to leakage characteristics. Highest inventory availability (28,800 pcs). REACH Unaffected status provides additional regulatory assurance.

SK34AH (Taiwan Semiconductor Corporation): Qualified substitute with automotive-grade designation and AEC-Q101 qualification. Reverse leakage current matches primary part specification (500 µA). Capacitance specification not provided in technical documentation. REACH Unaffected status provides additional regulatory assurance. Suitable for automotive and industrial applications requiring AEC-Q101 certification.

All three parts are active products with identical electrical performance in critical parameters (voltage, current, forward voltage drop, switching speed, and operating temperature range). Selection between substitutes is determined by inventory availability, automotive qualification requirements, and specific application leakage current sensitivity.

Frequently Asked Questions (FAQ)

Q: Can SK34A and SK34AH be used interchangeably with SS34F-HF?

A: Yes. All three parts meet identical specifications for voltage rating (40 V), current rating (3 A), forward voltage drop (550 mV @ 3 A), switching speed (≤ 500ns), and operating temperature range (-55°C to 150°C). All are packaged in DO-214AC (SMA) surface mount format and comply with ROHS3 requirements.

Q: What is the difference between SK34A and SK34AH?

A: Both parts are automotive-qualified (AEC-Q101) Schottky diodes with identical voltage, current, and temperature ratings. SK34A specifies reverse leakage current of 200 µA at 40 V, while SK34AH specifies 500 µA at 40 V. SK34AH does not provide capacitance specification in available documentation. Both are suitable for direct substitution with SS34F-HF.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All three parts use the DO-214AC (SMA) surface mount package. PCB footprints and reflow soldering profiles are identical. No layout or assembly modifications are required.

Q: Do the substitute parts have automotive qualification?

A: SK34A and SK34AH both carry automotive-grade designation with AEC-Q101 qualification. SS34F-HF does not specify automotive qualification in provided documentation. If automotive qualification is a design requirement, SK34A or SK34AH are the appropriate selections.

Q: What is the significance of reverse leakage current differences?

A: SK34A specifies 200 µA reverse leakage at 40 V, while SS34F-HF and SK34AH both specify 500 µA. Lower leakage current in SK34A provides reduced power dissipation in reverse bias conditions and may be beneficial in applications with stringent leakage requirements. This difference does not affect forward conduction characteristics or switching performance.

Q: Are all substitute parts RoHS compliant?

A: Yes. SS34F-HF, SK34A, and SK34AH are all ROHS3 compliant. All three parts have Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

Q: What inventory considerations apply to these parts?

A: SS34F-HF has 847 pcs in stock. SK34A has 28,800 pcs in stock. SK34AH has 15,852 pcs in stock. Substitute parts offer significantly higher inventory availability for supply chain continuity.