UG1A-M3/73 Equivalent & Substitute Parts

Part Overview

The UG1A-M3/73 is a general-purpose rectifier diode manufactured by Vishay General Semiconductor - Diodes Division. This through-hole component operates at 50 V DC reverse voltage with 1 A average rectified current in a DO-204AL (DO-41) axial package. The device is classified as Active product status and features fast recovery characteristics with a reverse recovery time of 25 ns.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, manufacturing discontinuation, or design flexibility needs while maintaining functional equivalence within the specified parameter ranges.

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-M3/73 is determined by the following critical parameters:

Mandatory Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 1 A minimum
Mounting Type: Through Hole
Package / Case: DO-204AL, DO-41, or Axial configuration
Operating Temperature Range: Must encompass or exceed -55°C to 150°C

Performance Characteristics:

Forward voltage (Vf) at 1 A: Acceptable range up to 1.2 V
Reverse leakage current: Up to 10 µA @ 50 V
Recovery speed: Fast Recovery (≤ 500ns) or Standard Recovery (> 500ns) both acceptable
Reverse recovery time (trr): Up to 200 ns acceptable

Compliance Requirements:

RoHS3 Compliant status required
REACH Unaffected status required

All three identified substitute parts meet these criteria and are electrically and mechanically compatible with the UG1A-M3/73 in applications requiring 50 V, 1 A general-purpose rectification.

Parameter Comparison

Parameter	UG1A-M3/73 (Vishay)	1N4001G (Taiwan Semiconductor)	1N4001RLG (onsemi)	1N4933G (Good-Ark)
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	—	—	200 ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	10 µA @ 50 V	5 µA @ 50 V
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 (Taiwan Semiconductor Corporation) and 1N4933G (Good-Ark Semiconductor) are both classified as Active products and represent the preferred substitution options. Both devices maintain ROHS3 compliance and REACH Unaffected status equivalent to the UG1A-M3/73.

The 1N4001G operates with standard recovery characteristics and forward voltage of 1 V @ 1 A, suitable for general-purpose rectification applications where recovery speed is not performance-critical.

The 1N4933G maintains fast recovery characteristics (≤ 500ns) with reverse recovery time of 200 ns, providing closer performance alignment to the UG1A-M3/73 fast recovery specification. Forward voltage is 1.2 V @ 1 A with identical reverse leakage current of 5 µA @ 50 V.

Secondary Substitute (Legacy Status):

The 1N4001RLG (onsemi) is classified as Not For New Designs and carries extended operating temperature range (-65 to 175°C). This device is electrically compatible but should not be selected for new circuit designs due to its product status designation.

Compliance Verification:

All three substitute parts maintain ROHS3 Compliant and REACH Unaffected certifications, ensuring regulatory equivalence with the UG1A-M3/73 across applicable jurisdictions.

Frequently Asked Questions (FAQ)

Q: Can the 1N4001G directly replace the UG1A-M3/73 in existing designs?

A: Yes. The 1N4001G meets all mandatory electrical parameters: 50 V reverse voltage, 1 A average rectified current, through-hole mounting, and DO-204AL package compatibility. Both devices operate across -55°C to 150°C and maintain ROHS3 compliance. The primary difference is recovery speed classification (Standard vs. Fast), which does not affect general-purpose rectification applications.

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

A: The UG1A-M3/73 and 1N4933G are fast recovery diodes with reverse recovery times of 25 ns and 200 ns respectively. The 1N4001G is a standard recovery diode with recovery time exceeding 500 ns. Fast recovery diodes switch off more quickly, reducing switching losses in high-frequency applications. Standard recovery diodes are suitable for line-frequency and low-frequency rectification.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All three substitute parts are supplied in DO-204AL (DO-41) axial through-hole packages, identical to the UG1A-M3/73. Physical dimensions and lead spacing are equivalent, allowing direct mechanical substitution on printed circuit boards designed for axial lead components.

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

A: The 1N4001RLG carries a legacy product status designation from onsemi, indicating the manufacturer does not recommend this part for new circuit designs. While electrically compatible, the 1N4001G or 1N4933G are preferred for new applications to ensure long-term supply availability and manufacturer support.

Q: How do forward voltage differences affect circuit performance?

A: The UG1A-M3/73 specifies 950 mV forward voltage at 1 A, while substitutes range from 1 V to 1.2 V. In rectification circuits, this 50-250 mV difference results in proportionally higher voltage drop across the diode. For low-voltage applications (< 12 V), this may be significant; for higher-voltage supplies (> 48 V), the percentage impact is negligible.

Q: Are all substitute parts available in the same packaging options?

A: The 1N4001G is supplied in Tape & Reel (TR) packaging. The 1N4001RLG is supplied in Cut Tape (CT) packaging. The 1N4933G is supplied in Cut Tape (CT) & Digi-Reel® packaging. All three are available in the DO-204AL (DO-41) component format. Packaging format selection depends on assembly process requirements (manual insertion vs. automated tape-fed equipment).

Q: Do all substitute parts meet the same compliance standards?

A: Yes. All three substitute parts are ROHS3 Compliant and REACH Unaffected, matching the UG1A-M3/73 regulatory status. Moisture Sensitivity Level (MSL) is 1 (Unlimited) for the UG1A-M3/73, 1N4001G, and 1N4933G, indicating no moisture sensitivity concerns. The 1N4001RLG lists MSL as Not Applicable.

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