RU 3A Equivalent & Substitute Parts Reference

Part Overview

RU 3A is a general-purpose, fast recovery rectifier diode with a maximum reverse voltage of 600 V and average rectified current of 1.5 A, featuring an axial through-hole package. The product is classified as obsolete, necessitating the identification of alternative models. Substitute diodes must adhere strictly to comparable electrical and mechanical parameters to ensure correct functionality and replacement compatibility in both new designs and maintenance applications.

Key Parameters

Parameter	Value
Manufacturer Part Number	RU 3A
Category	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	600 V
Current - Average Rectified (Io)	1.5A
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1.5 A
Speed	Fast Recovery =< 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	400 ns
Current - Reverse Leakage @ Vr	10 µA @ 600 V
Mounting Type	Through Hole
Package / Case	Axial
Operating Temperature - Junction	-40°C ~ 150°C
RoHS Status	RoHS Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution is performed strictly following the provided parameters. Only diodes meeting these matching criteria are considered:

Category: Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 1.5A
Voltage - Forward (Vf) (Max) @ If: Comparable values
Mounting Type: Through Hole
Package / Case: Axial configuration
RoHS Compliance and MSL

Parameter matching is fundamental to ensure proper interchangeability. Only parts with explicit data provided are grouped as substitutes.

Parameter Comparison

Parameter	RU 3A	1N5397-E3/54	1N5397GP-E3/73	GP15J-E3/54	GP15J-E3/73
Category	Diodes, Rectifiers	Diodes, Rectifiers	Diodes, Rectifiers	Diodes, Rectifiers	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	1.5A	1.5A	1.5A	1.5A	1.5A
Voltage - Forward (Vf) (Max) @ If	1.5 V @ 1.5 A	1.4 V @ 1.5 A	1.4 V @ 1.5 A	1.1 V @ 1.5 A	1.1 V @ 1.5 A
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Axial	DO-204AL, DO-41, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial	DO-204AC, DO-15, Axial
Operating Temperature - Junction	-40°C ~ 150°C	-50°C ~ 150°C	-65°C ~ 175°C	-65°C ~ 175°C	-65°C ~ 175°C
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Given the obsolete status of RU 3A, selection should be made from substitute parts listed as active with verified RoHS compliance and Moisture Sensitivity Level (MSL) 1 for unlimited storage. All listed substitutes conform to regulatory standards relevant to environmental and inventory controls.

Frequently Asked Questions (FAQ)

Q1: What parameters are crucial for substituting the RU 3A diode?
Only the explicitly provided parameters are used: Maximum reverse voltage, average rectified current, forward voltage at rated current, mounting type, package case, and regulatory compliance.

Q2: Are the substitute diodes direct drop-in replacements for RU 3A?
All substitutes share key common parameters essential for mechanical and electrical compatibility within the provided data.

Q3: Does the package/case matter for substitution?
Yes, all substitute parts have axial through-hole packages consistent with RU 3A, ensuring physical compatibility with existing board layouts.

Q4: How is RoHS compliance ensured in substitutions?
Only parts listed as RoHS Compliant or ROHS3 Compliant are included, matching the main part’s compliance status.

Q5: Are there differences in operating temperature range among the substitutes?
Some substitute parts specify wider junction operating temperature ranges. All documented ranges are within or beyond the RU 3A specification.

Q6: Can substitutes differ in forward voltage or recovery time?
Forward voltage values differ slightly within the listed substitutes. Only values documented in input parameters are considered acceptable for direct substitution. Recovery time values are listed where provided.

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