UG4A-M3/73 Equivalent & Substitute Parts

Part Overview

The UG4A-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 a 4 A average rectified current rating and features fast recovery characteristics. The part is classified as Active product status with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1). Substitute parts are identified when equivalent electrical and mechanical parameters are required for circuit applications where the primary part is unavailable or when design specifications permit operation within the defined parameter ranges of alternative components.

Substiute Parts

UG4A-M3/73

Vishay General Semiconductor - Diodes DivisionIn Stock: 1066UG4A-M3/73 Datasheet

Current PartRFQ

1N5400G

Taiwan Semiconductor CorporationIn Stock: 18811N5400G Datasheet

MFR RecommendedRFQ

EGP30A

Fairchild SemiconductorIn Stock: 4600EGP30A Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the UG4A-M3/73 are qualified based on the following electrical and mechanical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 50 V
• Package / Case: DO-201AD, Axial
• Mounting Type: Through Hole
• Product Status: Active
• RoHS Status: ROHS3 Compliant

Allowable Parameter Variations:

• Current - Average Rectified (Io): Substitute parts rated at 3 A are acceptable for applications where the circuit design permits reduced current capacity relative to the 4 A primary specification
• Voltage - Forward (Vf) (Max): Variations within the specified measurement conditions are acceptable provided the substitute part meets the 50 V reverse voltage requirement
• Speed Classification: Both fast recovery (≤ 500ns) and standard recovery (> 500ns) classifications are included in the substitute list, as recovery speed selection depends on application-specific switching requirements
• Reverse Recovery Time (trr): Variations are acceptable based on speed classification
• Operating Temperature Range: Substitute parts with extended or equivalent temperature ranges are acceptable

The identified substitute parts 1N5400G and EGP30A maintain the critical 50 V reverse voltage rating and DO-201AD package specification while operating at reduced 3 A current ratings.

Parameter Comparison

Engineering Selection Recommendations

UG4A-M3/73 (Primary Part) The UG4A-M3/73 is the specified component with Active product status, ROHS3 compliance, and defined moisture sensitivity level (MSL 1). This part maintains the highest current rating at 4 A with fast recovery characteristics and 30 ns reverse recovery time. Selection of this part is appropriate when the full 4 A current capacity and fast recovery performance are required by circuit design specifications.

1N5400G (Taiwan Semiconductor Corporation) The 1N5400G is rated at 3 A average rectified current with standard recovery speed classification (> 500ns). This part maintains ROHS3 compliance and MSL 1 rating. The forward voltage is specified at 1.1 V @ 3 A. Selection of this part is appropriate for applications where 3 A current capacity is sufficient and standard recovery speed meets circuit requirements. The higher forward voltage drop should be evaluated against thermal and efficiency constraints.

EGP30A (Fairchild Semiconductor) The EGP30A is rated at 3 A average rectified current with fast recovery characteristics (≤ 500ns) and 50 ns reverse recovery time. This part maintains REACH Unaffected status. RoHS compliance status and moisture sensitivity level are not specified by the supplier. The forward voltage is specified at 950 mV @ 3 A, matching the primary part specification. Selection of this part is appropriate for applications where 3 A current capacity is sufficient and fast recovery performance is required. Compliance verification with project-specific RoHS and MSL requirements is necessary prior to implementation.

Frequently Asked Questions (FAQ)

Q: Can the 1N5400G or EGP30A be used as direct replacements for the UG4A-M3/73?

A: Both substitute parts maintain the 50 V reverse voltage rating and DO-201AD through-hole package specification. However, the substitute parts are rated at 3 A average rectified current compared to the primary part's 4 A rating. Direct substitution is permissible only when circuit design specifications allow operation at the reduced 3 A current capacity. The 1N5400G operates with standard recovery speed, while the EGP30A maintains fast recovery characteristics similar to the primary part.

Q: What are the key differences between the 1N5400G and EGP30A?

A: Both parts share the same 50 V reverse voltage rating, 3 A current capacity, and DO-201AD package. The primary differences are: (1) Speed classification—1N5400G uses standard recovery (> 500ns) while EGP30A uses fast recovery (≤ 500ns); (2) Forward voltage—1N5400G is specified at 1.1 V @ 3 A while EGP30A is specified at 950 mV @ 3 A; (3) Reverse recovery time—EGP30A specifies 50 ns while 1N5400G does not provide this parameter; (4) Capacitance—EGP30A specifies 95 pF @ 4V, 1MHz compared to 1N5400G at 25 pF @ 4V, 1MHz; (5) Compliance documentation—1N5400G provides explicit ROHS3 and MSL 1 ratings while EGP30A does not specify these parameters.

Q: Are there any thermal or efficiency considerations when substituting to a 3 A part?

A: The forward voltage specification is a critical parameter for thermal analysis. The 1N5400G specifies 1.1 V @ 3 A, which is higher than the UG4A-M3/73 at 950 mV @ 4 A and the EGP30A at 950 mV @ 3 A. Power dissipation calculations should incorporate the forward voltage rating of the selected substitute part. At equivalent current levels, the 1N5400G will generate additional heat compared to the EGP30A due to the higher forward voltage specification.

Q: Does package compatibility affect substitution?

A: All three parts use the DO-201AD axial through-hole package. Physical dimensions and PCB footprint compatibility are identical. No package-related modifications to circuit board layout or assembly procedures are required when substituting between these parts.

Q: What compliance considerations apply to each part?

A: The UG4A-M3/73 and 1N5400G both specify ROHS3 compliance and MSL 1 (Unlimited) rating. The EGP30A specifies REACH Unaffected status but does not provide explicit RoHS compliance or MSL ratings. All three parts specify REACH Unaffected status. Project-specific compliance requirements should be verified against the provided specifications prior to part selection.

Q: How does recovery speed affect circuit performance?

A: The UG4A-M3/73 and EGP30A both specify fast recovery characteristics (≤ 500ns) with reverse recovery times of 30 ns and 50 ns respectively. The 1N5400G specifies standard recovery (> 500ns) without a defined reverse recovery time parameter. Recovery speed affects switching transient behavior and electromagnetic interference characteristics. Applications requiring fast switching performance should select parts with fast recovery classification.