US1GFA Equivalent & Substitute Parts

Part Overview

The US1GFA is a general-purpose rectifier diode manufactured by onsemi, rated for 400 V DC reverse voltage and 1 A average rectified current in a surface mount SOD-123FL 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 legacy system maintenance, repair operations, and design transitions to active alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Mounting Type	Surface Mount	-
Package / Case	SOD-123F	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitute parts for the US1GFA are classified into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Direct Substitutes): Parts that match all critical electrical parameters—400 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, fast recovery speed classification, and surface mount SOD-123F package configuration. These parts maintain functional interchangeability within the same circuit application.

Similar Parts (Package or Performance Variants): Parts that satisfy the core voltage and current ratings but may differ in secondary parameters such as reverse recovery time, forward voltage characteristics, or package form factor. These require circuit-level evaluation for compatibility.

The following parameters determine substitution eligibility:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 1 A
Mounting Type: Surface Mount
Package / Case: SOD-123F or SOD-123FL
Operating Temperature Range: -55°C to 150°C minimum

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	Package	Product Status
US1GFA	onsemi	400	1	1.3 @ 1 A	50	5 @ 400 V	SOD-123FL	Not For New Designs
NRVUS1GFA	onsemi	400	1	1.3 @ 1 A	50	5 @ 400 V	SOD-123FL	Not For New Designs
HS1GFL	Taiwan Semiconductor Corporation	400	1	1.3 @ 1 A	50	5 @ 400 V	SOD-123F	Active
RS1004FL_R1_00001	Panjit International Inc.	400	1	1.3 @ 1 A	150	1 @ 400 V	SOD-123FL	Active
RS1GWF-HF	Comchip Technology	400	1	1.3 @ 1 A	150	5 @ 400 V	SOD-123F	Active
TSOD1F4HM RVG	Taiwan Semiconductor Corporation	400	1	1.3 @ 1 A	150	5 @ 400 V	SOD-123FL	Active
US1GWF-HF	Comchip Technology	400	1	1.3 @ 1 A	50	5 @ 400 V	SOD-123F	Active
AU1FG-M3/H	Vishay	400	1	1.5 @ 1 A	75	1 @ 400 V	DO-219AB (SMF)	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

HS1GFL (Taiwan Semiconductor Corporation) and US1GWF-HF (Comchip Technology) provide parametric equivalence to the US1GFA with matching reverse recovery time of 50 ns and identical forward voltage characteristics. Both are classified as Active products and carry ROHS3 compliance. HS1GFL maintains the highest inventory availability at 26,818 units.

For Active Product Transition:

RS1004FL_R1_00001 (Panjit International Inc.) and TSOD1F4HM RVG (Taiwan Semiconductor Corporation) are active alternatives with identical voltage and current ratings. These parts exhibit extended reverse recovery time (150 ns) compared to the original specification (50 ns), which may affect switching performance in high-frequency applications but remains within fast recovery classification.

For Automotive Applications:

NRVUS1GFA (onsemi) is qualified to AEC-Q101 automotive standard and maintains all electrical parameters identical to US1GFA, including 50 ns reverse recovery time. This part is suitable for automotive-grade legacy system maintenance.

For Package Variant Consideration:

AU1FG-M3/H (Vishay) operates at 400 V and 1 A but uses DO-219AB (SMF) package instead of SOD-123F, with forward voltage of 1.5 V at 1 A and 75 ns reverse recovery time. This part requires PCB layout modification and is suitable only when package footprint change is acceptable.

Frequently Asked Questions (FAQ)

Q: Can HS1GFL directly replace US1GFA in existing designs?

A: HS1GFL meets all critical electrical parameters: 400 V reverse voltage, 1 A average rectified current, 1.3 V forward voltage at 1 A, and 50 ns reverse recovery time. The package is SOD-123F, which is mechanically compatible with SOD-123FL footprints. Direct substitution is supported.

Q: What is the difference between SOD-123F and SOD-123FL packaging?

A: Both designations refer to the same physical package form factor used for surface mount diodes. The "L" suffix in SOD-123FL indicates tape and reel packaging format for automated assembly. The component itself is identical.

Q: Why do some substitutes have longer reverse recovery times (150 ns vs. 50 ns)?

A: Reverse recovery time affects switching speed in rectification circuits. Parts with 150 ns recovery time (RS1004FL_R1_00001, RS1GWF-HF, TSOD1F4HM RVG) remain classified as fast recovery but exhibit slower switching than the original 50 ns specification. Application suitability depends on circuit switching frequency requirements.

Q: Is NRVUS1GFA suitable for automotive applications?

A: NRVUS1GFA carries AEC-Q101 automotive qualification and maintains identical electrical specifications to US1GFA. It is suitable for automotive-grade applications requiring legacy component replacement.

Q: Can AU1FG-M3/H be used as a substitute despite different packaging?

A: AU1FG-M3/H uses DO-219AB (SMF) package instead of SOD-123F, requiring PCB layout modification. Forward voltage is 1.5 V versus 1.3 V, and reverse recovery time is 75 ns versus 50 ns. Substitution requires circuit redesign and is not a direct drop-in replacement.

Q: Which substitute part has the best inventory availability?

A: HS1GFL maintains the highest inventory at 26,818 units in stock, followed by RS1004FL_R1_00001 at 20,100 units. Both are active products with ROHS3 compliance.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry ROHS3 compliance status. AU1FG-M3/H compliance information was not provided in the specification data.

Q: What is the significance of "Not For New Designs" status on US1GFA?

A: This designation indicates the part has reached end-of-life and is no longer recommended for new circuit designs. Existing inventory remains available for legacy system support and repair operations. Active alternatives should be selected for new product development.

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