Equivalent & Substitute Parts for US1DFA

Part Overview

The US1DFA is a general-purpose rectifier diode manufactured by onsemi, rated for 200 V DC reverse voltage and 1 A average rectified current in a surface mount SOD-123FA package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. Identification of equivalent and substitute parts is necessary for ongoing maintenance, repair, and legacy system support where the original part is no longer available or procurement is constrained.

Substiute Parts

US1DFA

onsemiIn Stock: 3291US1DFA Datasheet

Current PartRFQ

ES07D-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 6292ES07D-GS18 Datasheet

SimilarRFQ

UF1DLW RVG

Taiwan Semiconductor CorporationIn Stock: 8705UF1DLW RVG Datasheet

Parametric EquivalentRFQ

UF1DLWH

Taiwan Semiconductor CorporationIn Stock: 14064UF1DLWH Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the US1DFA are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Full Electrical Match):

• UF1DLW RVG (Taiwan Semiconductor Corporation)
• UF1DLWH (Taiwan Semiconductor Corporation)

These parts maintain identical voltage ratings (200 V), current ratings (1 A), forward voltage characteristics (950 mV @ 1 A), operating temperature range (-55°C to 150°C), and surface mount technology. Both are packaged in SOD-123W and comply with ROHS3 and REACH requirements. The primary distinction is product status: UF1DLW RVG is discontinued at DiGi Electronics, while UF1DLWH remains active.

Functional Substitute (Reduced Current Rating):

• ES07D-GS18 (Vishay General Semiconductor - Diodes Division)

This part shares the 200 V reverse voltage rating and surface mount technology but operates at 500 mA average rectified current, representing a 50% reduction from the US1DFA specification. The ES07D-GS18 is packaged in DO-219AB (SMF) and carries active product status with AEC-Q101 automotive qualification.

Substitution eligibility is determined by:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 200 V
• Current - Average Rectified (Io): Must equal or exceed circuit requirements
• Mounting Type: Surface Mount required
• Operating Temperature Range: Must encompass -55°C to 150°C
• RoHS and REACH Compliance: ROHS3 Compliant and REACH Unaffected required

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred):

UF1DLWH is the primary recommended substitute. This part maintains full electrical equivalence to the US1DFA across all critical parameters: 200 V reverse voltage, 1 A current rating, 950 mV forward voltage, and identical operating temperature range. UF1DLWH carries active product status, ensuring long-term availability and supply chain stability. Both parts are ROHS3 compliant and REACH unaffected. The SOD-123W package is mechanically compatible with the original SOD-123FA footprint for surface mount applications.

Alternative Parametric Equivalent:

UF1DLW RVG provides identical electrical specifications to UF1DLWH but is discontinued at DiGi Electronics. This part is suitable only for applications where existing inventory is available and future procurement is not required.

Functional Substitute (Current-Limited Applications):

ES07D-GS18 is applicable only in circuits where the maximum current requirement does not exceed 500 mA. This part offers the advantage of active product status and AEC-Q101 automotive qualification. The DO-219AB package differs from the SOD-123W, requiring PCB layout verification for mechanical fit. Forward voltage is marginally higher at 980 mV compared to 950 mV, which may affect circuit performance in voltage-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can UF1DLWH directly replace US1DFA without circuit modification?

A: Yes. UF1DLWH is a parametric equivalent with identical voltage rating (200 V), current rating (1 A), forward voltage (950 mV @ 1 A), and operating temperature range (-55°C to 150°C). The SOD-123W package is mechanically compatible with SOD-123FA footprints on surface mount PCBs. No circuit modification is required.

Q: What is the difference between UF1DLW RVG and UF1DLWH?

A: Both parts are electrically identical. The primary difference is product status: UF1DLW RVG is discontinued at DiGi Electronics, while UF1DLWH is active. UF1DLWH is recommended for new procurement due to superior availability and supply chain continuity.

Q: Can ES07D-GS18 be used as a substitute in all applications?

A: No. ES07D-GS18 is rated for 500 mA average rectified current, which is 50% of the US1DFA rating. This part is suitable only for circuits where the maximum current requirement does not exceed 500 mA. The DO-219AB package also differs from SOD-123W, requiring PCB layout verification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. US1DFA, UF1DLW RVG, UF1DLWH, and ES07D-GS18 are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the reverse recovery time difference between US1DFA and the substitutes?

A: US1DFA has a reverse recovery time (trr) of 50 ns. UF1DLW RVG and UF1DLWH both have 20 ns trr, and ES07D-GS18 has 25 ns trr. Faster recovery times in the substitutes represent improved performance characteristics and do not create compatibility issues in standard rectifier applications.

Q: Is the forward voltage difference between US1DFA and ES07D-GS18 significant?

A: The difference is 30 mV (950 mV versus 980 mV). In most applications, this is negligible. However, in voltage-sensitive circuits with tight regulation requirements, this difference may affect performance. Circuit analysis is required for applications with marginal voltage headroom.

Q: Can I use UF1DLWH in automotive applications?

A: UF1DLWH does not carry AEC-Q101 automotive qualification. For automotive applications requiring qualified components, ES07D-GS18 is the only substitute with AEC-Q101 certification, provided the 500 mA current rating is sufficient.