US3AC-HF Equivalent & Substitute Parts

Part Overview

The US3AC-HF is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 50 V DC reverse voltage and 3 A average rectified current in a DO-214AB surface mount package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts become necessary when the primary part reaches end-of-life status, experiences supply constraints, or when design flexibility requires alternative sourcing from qualified manufacturers. The substitute parts listed maintain electrical and mechanical compatibility through identical or superior parametric specifications within the DO-214AB package family.

Substiute Parts

US3AC-HF

Comchip TechnologyIn Stock: 1072US3AC-HF Datasheet

Current PartRFQ

HS3A R7G

Taiwan Semiconductor CorporationIn Stock: 1510HS3A R7G Datasheet

Parametric EquivalentRFQ

HS3A V7G

Taiwan Semiconductor CorporationIn Stock: 2642HS3A V7G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the US3AC-HF is determined by the following critical parameters:

Mandatory Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 50 V
• Current - Average Rectified (Io): 3 A
• Voltage - Forward (Vf) (Max) @ If: 1 V @ 3 A
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Reverse Recovery Time (trr): 50 ns
• Package / Case: DO-214AB (SMC)
• Mounting Type: Surface Mount
• Operating Temperature - Junction: -55°C to 150°C
• RoHS Status: ROHS3 Compliant

Acceptable Variation Parameters:

• Current - Reverse Leakage @ Vr: Equal or lower values are acceptable
• Capacitance @ Vr, F: Specification presence does not disqualify substitution
• Packaging Format: Tape & Reel (TR) and Cut Tape (CT) are both surface mount compatible formats

The substitute parts HS3A R7G and HS3A V7G meet all mandatory matching criteria and are therefore classified as parametric equivalents to the US3AC-HF.

Parameter Comparison

Engineering Selection Recommendations

US3AC-HF (Primary Selection)

The US3AC-HF maintains Active product status with continuous availability. This part is the preferred selection for new designs and ongoing production requirements. Full RoHS3 compliance and unlimited MSL rating support standard manufacturing and storage conditions without special handling protocols.

HS3A R7G (Substitute - Cut Tape Packaging)

The HS3A R7G is a parametric equivalent with Discontinued at DiGi Electronics status. This part meets all mandatory electrical specifications and operates within identical temperature ranges. The reverse leakage current specification of 10 µA at 50 V is higher than the US3AC-HF at 5 µA, remaining within acceptable limits for general-purpose rectification applications. Cut Tape (CT) packaging format is compatible with standard surface mount assembly processes. RoHS3 compliance and REACH Unaffected status confirm regulatory alignment.

HS3A V7G (Substitute - Unspecified Packaging)

The HS3A V7G is a parametric equivalent with Discontinued at DiGi Electronics status. Electrical specifications are identical to HS3A R7G. Packaging format is not specified in the provided data. RoHS3 compliance and REACH Unaffected status confirm regulatory alignment. Packaging verification is required before procurement.

Selection Criteria Summary

• For new designs and active production: US3AC-HF
• For legacy system support or supply diversification: HS3A R7G (with confirmed packaging availability)
• For applications where reverse leakage current specification of 10 µA is acceptable: HS3A R7G or HS3A V7G

Frequently Asked Questions (FAQ)

Q: Can HS3A R7G or HS3A V7G be used as direct replacements for US3AC-HF in existing designs?

A: Yes. Both substitute parts meet all mandatory electrical parameters: 50 V reverse voltage rating, 3 A average rectified current, 1 V forward voltage at 3 A, 50 ns reverse recovery time, and identical operating temperature range. Package and mounting type specifications are identical. The higher reverse leakage current (10 µA vs. 5 µA) does not disqualify substitution for general-purpose rectification applications.

Q: What is the difference between HS3A R7G and HS3A V7G?

A: Both parts are parametrically identical with matching electrical specifications. The primary difference is packaging format: HS3A R7G is specified as Cut Tape (CT), while HS3A V7G packaging format is not specified in the provided data. Confirm packaging availability with the supplier before selecting HS3A V7G.

Q: Does the higher reverse leakage current in the substitute parts affect circuit performance?

A: The reverse leakage current specification for HS3A R7G and HS3A V7G is 10 µA at 50 V, compared to 5 µA for US3AC-HF. This difference is within acceptable limits for general-purpose rectifier applications. Circuit-specific leakage requirements must be evaluated against application specifications.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both HS3A R7G and HS3A V7G are ROHS3 Compliant with Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the US3AC-HF.

Q: What is the significance of "Discontinued at DiGi Electronics" status for the substitute parts?

A: Discontinued at DiGi Electronics status indicates that these parts are no longer actively stocked through this specific distributor channel. However, inventory availability through alternative suppliers may exist. Verify current stock status and lead times with authorized distributors before finalizing procurement decisions.

Q: Can HS3A R7G and HS3A V7G be used interchangeably in the same assembly?

A: Both parts meet identical electrical specifications and operate within the same temperature range. Interchangeability depends on packaging format compatibility with assembly equipment. HS3A R7G is specified as Cut Tape (CT). HS3A V7G packaging format requires confirmation before use in automated assembly processes.

Q: What certifications apply to these substitute parts?

A: Both substitute parts carry ROHS3 Compliant status and REACH Unaffected designation. ECCN classification is EAR99 for all parts. HTSUS code 8541.10.0080 applies to all listed diodes.