UG1A-M3/54 Equivalent & Substitute Parts

Part Overview

The UG1A-M3/54 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This component is rated for 50 V DC reverse voltage with 1 A average rectified current in a through-hole DO-204AL (DO-41) axial package. The part is classified as Active product status and is RoHS3 compliant.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across the specified parameter range. The UG1A-M3/54 has three qualified substitute options that meet the core functional requirements for general-purpose rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	mV
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	25	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Mounting Type	Through Hole	-
Package / Case	DO-204AL, DO-41, Axial	-
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the UG1A-M3/54 is determined by the following core parameters:

Voltage Rating: All substitutes must maintain 50 V DC reverse voltage (Vr) maximum
Current Rating: All substitutes must support 1 A average rectified current (Io)
Package Compatibility: All substitutes must use through-hole DO-204AL (DO-41) axial mounting
Operating Temperature Range: All substitutes must cover the application temperature envelope
Compliance: All substitutes must maintain RoHS3 compliance status

The three qualified substitutes (1N4001G, 1N4001RLG, and 1N4933G) meet these core requirements. Variations in forward voltage drop, recovery speed classification, and reverse leakage current are within acceptable tolerance for general-purpose rectification applications where these parameters are not application-critical constraints.

Parameter Comparison

Parameter	UG1A-M3/54 (Main)	1N4001G	1N4001RLG	1N4933G
Manufacturer	Vishay General Semiconductor	Taiwan Semiconductor Corporation	onsemi	Good-Ark Semiconductor
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	1 A	1 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	1 V @ 1 A	1.1 V @ 1 A	1.2 V @ 1 A
Speed Classification	Fast Recovery ≤ 500ns	Standard Recovery >500ns	Standard Recovery >500ns	Fast Recovery ≤ 500ns
Reverse Recovery Time (trr)	25 ns	Not specified	Not specified	200 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	10 µA @ 50 V	5 µA @ 50 V
Capacitance @ Vr, F	7 pF @ 4V, 1MHz	10 pF @ 4V, 1MHz	Not specified	15 pF @ 4V, 1MHz
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial
Operating Temperature - Junction	-55 to 150°C	-55 to 150°C	-65 to 175°C	-55 to 125°C
Product Status	Active	Active	Not For New Designs	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Active Product Status)

The 1N4001G and 1N4933G are both classified as Active products and represent the preferred substitution options for new designs and ongoing production.

1N4001G is manufactured by Taiwan Semiconductor Corporation and maintains identical voltage and current ratings with the same operating temperature range as the UG1A-M3/54. This part operates with standard recovery speed classification and is suitable for applications where fast recovery characteristics are not required.

1N4933G is manufactured by Good-Ark Semiconductor and maintains fast recovery speed classification matching the UG1A-M3/54. This part operates within a narrower temperature range (-55 to 125°C) compared to the main part and exhibits higher forward voltage drop (1.2 V @ 1 A) and higher capacitance (15 pF @ 4V, 1MHz).

Secondary Substitute (Not For New Designs)

The 1N4001RLG is manufactured by onsemi and carries a "Not For New Designs" product status designation. This part is available for legacy system support and repair applications only. The 1N4001RLG operates across an extended temperature range (-65 to 175°C) and exhibits higher reverse leakage current (10 µA @ 50 V) compared to the main part.

All three substitutes maintain RoHS3 compliance and are electrically and mechanically compatible with the UG1A-M3/54 within the specified parameter envelope.

Frequently Asked Questions (FAQ)

Q: Can the 1N4001G directly replace the UG1A-M3/54 in existing designs?

A: Yes. The 1N4001G maintains identical voltage rating (50 V), current rating (1 A), package type (DO-204AL axial), and operating temperature range (-55 to 150°C). The primary difference is the speed classification: 1N4001G operates with standard recovery (>500ns) while the UG1A-M3/54 operates with fast recovery (≤500ns). This substitution is valid for applications where recovery speed is not a critical design parameter.

Q: What is the difference between fast recovery and standard recovery diodes?

A: Recovery speed refers to the time required for a diode to transition from forward conduction to reverse blocking state. Fast recovery diodes (≤500ns) are used in high-frequency switching applications and power conversion circuits. Standard recovery diodes (>500ns) are suitable for general-purpose rectification and low-frequency applications. The UG1A-M3/54 and 1N4933G are fast recovery devices, while 1N4001G and 1N4001RLG are standard recovery devices.

Q: Why is the 1N4001RLG marked "Not For New Designs"?

A: The "Not For New Designs" status indicates that onsemi has designated this part for legacy applications only. New product development should utilize the 1N4001G or 1N4933G, both of which carry Active product status and receive ongoing manufacturer support.

Q: Are all three substitutes available in the same packaging format?

A: All three substitutes use through-hole DO-204AL (DO-41) axial packages, which are mechanically compatible with the UG1A-M3/54. However, packaging format differs: 1N4001G is supplied in Tape & Reel (TR) format, while 1N4001RLG is supplied in Cut Tape (CT) format, and 1N4933G is supplied in Cut Tape (CT) & Digi-Reel® format. Verify packaging availability with your supplier for production requirements.

Q: What is the significance of forward voltage drop differences among these parts?

A: Forward voltage drop (Vf) represents the voltage across the diode during forward conduction. The UG1A-M3/54 exhibits 950 mV @ 1 A, while substitutes range from 1 V to 1.2 V @ 1 A. These differences affect power dissipation and heat generation. In general-purpose rectification applications, these variations are typically acceptable. Applications with strict power budget constraints should evaluate the specific forward voltage drop impact on system performance.

Q: Can the 1N4933G be used in applications requiring the full temperature range of the UG1A-M3/54?

A: The 1N4933G operates within -55 to 125°C, which does not cover the full -55 to 150°C range of the UG1A-M3/54. If the application requires operation above 125°C, the 1N4933G is not suitable. The 1N4001G maintains the identical -55 to 150°C range and is the appropriate substitute for temperature-critical applications.

Q: What does RoHS3 compliance mean for component substitution?

A: RoHS3 (Restriction of Hazardous Substances Directive 3) compliance indicates that the component meets European Union environmental standards restricting the use of specific hazardous materials. All three substitutes maintain RoHS3 compliance, ensuring compatibility with regulatory requirements for products destined for EU markets and environmentally conscious applications.

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