US3GC-HF Equivalent & Substitute Parts

Part Overview

The US3GC-HF is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 400 V DC reverse voltage and 3 A average rectified current in a DO-214AB (SMC) surface mount package. This diode is classified as a fast recovery device with a reverse recovery time of 50 ns and operates across a junction temperature range of -55°C to 150°C. The part is currently Active in product status and ROHS3 compliant.

Substitute parts are necessary when the primary part becomes unavailable due to supply constraints, manufacturing discontinuation, or inventory limitations. Alternative manufacturers produce equivalent devices that meet the same electrical and mechanical specifications, enabling continued circuit functionality and production continuity.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution eligibility for the US3GC-HF is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 400 V
Current - Average Rectified (Io): 3 A
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Operating Temperature - Junction: -55°C to 150°C
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Allowable Parameter Variations: Substitute parts may exhibit differences in the following parameters while remaining functionally equivalent:

Reverse Recovery Time (trr): Variations permitted within fast recovery classification
Current - Reverse Leakage @ Vr: Variations permitted (lower leakage is acceptable)
Voltage - Forward (Vf) (Max) @ If: Minor variations at different test currents are acceptable
Capacitance @ Vr, F: Variations permitted as this parameter is not specified for the main part
Packaging format (Tape & Reel vs. Cut Tape): Both formats are acceptable for surface mount assembly

All substitute parts listed below meet the mandatory matching parameters and are therefore electrically and mechanically interchangeable with the US3GC-HF in standard circuit applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [V]	trr [ns]	Ir @ Vr [µA]	Package	Status	Inventory [Pcs]
US3GC-HF	Comchip Technology	400	3	1.3 @ 3 A	50	5 @ 400 V	DO-214AB, SMC	Active	889
ES3G V7G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	35	10 @ 400 V	DO-214AB, SMC	Discontinued at DiGi Electronics	6374
HS3G R7G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	50	10 @ 400 V	DO-214AB, SMC	Discontinued at DiGi Electronics	919
HS3G V7G	Taiwan Semiconductor Corporation	400	3	1.3 @ 3 A	50	10 @ 400 V	DO-214AB, SMC	Discontinued at DiGi Electronics	1920
RS3G-E3/57T	Vishay General Semiconductor - Diodes Division	400	3	1.3 @ 2.5 A	150	10 @ 400 V	DO-214AB, SMC	Active	7818
RS3G-E3/9AT	Vishay General Semiconductor - Diodes Division	400	3	1.3 @ 2.5 A	150	10 @ 400 V	DO-214AB, SMC	Active	4399
UF3G_R1_00001	Panjit International Inc.	400	3	1.3 @ 3 A	50	1 @ 400 V	DO-214AB, SMC	Active	1875

Engineering Selection Recommendations

Primary Selection Criteria:

Product Status and Availability: Parts with Active status are preferred for new designs and ongoing production. The US3GC-HF (Comchip Technology) and both Vishay RS3G variants (RS3G-E3/57T, RS3G-E3/9AT) maintain Active status. The Panjit UF3G_R1_00001 is also Active. Taiwan Semiconductor Corporation parts (ES3G V7G, HS3G R7G, HS3G V7G) are listed as Discontinued at DiGi Electronics and should be used only when inventory availability is confirmed through alternative distribution channels.
Compliance and Certifications: All listed substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the primary part's compliance profile. All parts carry ECCN EAR99 and HTSUS 8541.10.0080 classifications.
Inventory Availability: Current stock levels vary significantly. RS3G-E3/57T (Vishay) offers the highest inventory at 7,818 pieces. ES3G V7G (Taiwan Semiconductor) provides 6,374 pieces. RS3G-E3/9AT (Vishay) provides 4,399 pieces. UF3G_R1_00001 (Panjit) provides 1,875 pieces. HS3G V7G (Taiwan Semiconductor) provides 1,920 pieces. HS3G R7G (Taiwan Semiconductor) provides 919 pieces. The primary part US3GC-HF has 889 pieces in stock.
Reverse Recovery Time Considerations: The primary part and UF3G_R1_00001 both specify 50 ns reverse recovery time. ES3G V7G offers improved performance at 35 ns. HS3G variants match at 50 ns. Vishay RS3G parts specify 150 ns, which remains within the fast recovery classification but represents a longer recovery interval.
Reverse Leakage Current: UF3G_R1_00001 exhibits the lowest reverse leakage at 1 µA @ 400 V, compared to the primary part's 5 µA. Taiwan Semiconductor and Vishay parts specify 10 µA, which is acceptable within the fast recovery diode classification.

Frequently Asked Questions (FAQ)

Q: Can I substitute any of these parts directly into a circuit designed for the US3GC-HF?

A: Yes. All listed substitute parts meet the mandatory electrical and mechanical specifications: 400 V reverse voltage rating, 3 A average rectified current, DO-214AB SMC package, surface mount configuration, and -55°C to 150°C operating temperature range. Direct substitution is supported without circuit modification.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) packaging?

A: Both packaging formats contain the same diode in the DO-214AB SMC package. Tape & Reel packaging is supplied on continuous carrier tape suitable for automated pick-and-place assembly equipment. Cut Tape packaging is supplied in shorter tape segments. The electrical and mechanical properties of the diode are identical. Selection depends on assembly equipment compatibility and inventory management preferences.

Q: Why do some substitute parts show different forward voltage specifications?

A: Forward voltage is specified at different test currents. The primary part specifies Vf at 3 A, while Vishay RS3G parts specify Vf at 2.5 A. Both values fall within acceptable operating ranges for general-purpose rectifier applications. The difference reflects manufacturer test methodology rather than functional incompatibility.

Q: What does "Discontinued at DiGi Electronics" mean for the Taiwan Semiconductor parts?

A: This designation indicates that these parts are no longer actively stocked or promoted by DiGi Electronics as a distributor. However, the parts may remain available through alternative distribution channels or direct manufacturer inventory. Verify current availability through your supply chain before committing to these alternatives for production use.

Q: Are there any performance advantages to selecting one substitute over another?

A: ES3G V7G offers the fastest reverse recovery time at 35 ns compared to the primary part's 50 ns, which may provide marginal switching efficiency improvements in high-frequency applications. UF3G_R1_00001 exhibits the lowest reverse leakage current at 1 µA, which may be beneficial in low-leakage applications. For standard general-purpose rectification, these differences are not functionally significant.

Q: Can I mix different substitute parts in the same circuit board assembly?

A: Yes. All substitute parts are electrically equivalent and mechanically compatible. Mixed sourcing is acceptable from a functional standpoint. However, manufacturing and quality control processes typically standardize on a single part number per design to maintain consistency in production testing and traceability.

Q: What is the significance of the RoHS3 compliance marking?

A: RoHS3 compliance certifies that the diode meets European Union Restriction of Hazardous Substances Directive requirements, restricting the use of lead, cadmium, mercury, and other hazardous materials. All listed parts carry this certification, ensuring compatibility with environmental regulations and customer requirements in regulated markets.

Q: How do I determine which substitute part to order?

A: Prioritize parts with Active product status for new designs: US3GC-HF (primary), RS3G-E3/57T, RS3G-E3/9AT, or UF3G_R1_00001. Verify current inventory availability through your distributor. For cost optimization, compare pricing across manufacturers. For performance-critical applications, ES3G V7G offers faster recovery characteristics if inventory can be confirmed through alternative channels.

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