RN 4Z Equivalent & Substitute Parts Reference

Part Overview

The Sanken Electric USA Inc. RN 4Z is a fast recovery, general-purpose diode rated for 200 V and 3.5 A in an axial through-hole package. It features a maximum forward voltage of 920 mV at 3.5 A, 100 ns reverse recovery time, and low reverse leakage current. The RN 4Z is obsolete, necessitating the selection of alternative part numbers for ongoing designs or maintenance. Substitute selection requires rigorous matching of voltage rating, current rating, switching speed, mechanical form factor, and regulatory compliance.

Key Parameters

Parameter	Value
Manufacturer Part Number	RN 4Z
Category	Diodes, Rectifiers
Voltage - DC Reverse (Vr) (Max)	200 V
Current - Average Rectified (Io)	3.5A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 3.5A
Speed	Fast Recovery =< 500ns, > 200mA (Io)
Reverse Recovery Time (trr)	100 ns
Current - Reverse Leakage @ Vr	50 µA @ 200 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)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitutes for RN 4Z are selected based strictly on the following provided parameters:

Maximum Reverse Voltage (Vr): Must be 200 V.
Average Rectified Current (Io): Must be at least 3.5A.
Forward Voltage (Vf) at specified current: Must be comparable.
Reverse Recovery Time (trr): Must meet or exceed 100 ns.
Reverse Leakage Current @ Vr: Must be less than or equal to 50 µA @ 200 V.
Mounting Type and Package: Must be through-hole axial.
Operating Temperature Range: Must meet or exceed the main part's range.
Regulatory Compliance (RoHS, MSL): Must be stated.
Product Category: Diodes, Rectifiers.

Only substitute parts matching all required electrical and mechanical specifications are considered.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Category	Voltage - DC Reverse (Vr) (Max)	Current - Average Rectified (Io)	Voltage - Forward (Vf) (Max) @ If	Reverse Recovery Time (trr)	Current - Reverse Leakage @ Vr	Mounting Type	Package / Case	Operating Temperature - Junction	RoHS Status	Moisture Sensitivity Level (MSL)	Product Status
RN 4Z	Sanken Electric USA Inc.	Diodes, Rectifiers	200 V	3.5A	920 mV @ 3.5A	100 ns	50 µA @ 200 V	Through Hole	Axial	-40°C ~ 150°C	RoHS Compliant	1 (Unlimited)	Obsolete
BYV28-200-TAP	Vishay General Semiconductor	Diodes, Rectifiers	200 V	3.5A	1.1 V @ 5A	30 ns	1 µA @ 200 V	Through Hole	SOD-64, Axial	-55°C ~ 175°C	ROHS3 Compliant	1 (Unlimited)	Active
BYV98-200-TR	Vishay General Semiconductor	Diodes, Rectifiers	200 V	4A	1.1 V @ 5A	35 ns	10 µA @ 200 V	Through Hole	SOD-64, Axial	-55°C ~ 175°C	ROHS3 Compliant	1 (Unlimited)	Active
MUR420-E3/54	Vishay General Semiconductor	Diodes, Rectifiers	200 V	4A	890 mV @ 4A	35 ns	5 µA @ 200 V	Through Hole	DO-201AD, Axial	-65°C ~ 175°C	ROHS3 Compliant	1 (Unlimited)	Active
MUR420-E3/73	Vishay General Semiconductor	Diodes, Rectifiers	200 V	4A	890 mV @ 4A	35 ns	5 µA @ 200 V	Through Hole	DO-201AD, Axial	-65°C ~ 175°C	ROHS3 Compliant	1 (Unlimited)	Active
MUR420G	onsemi	Diodes, Rectifiers	200 V	4A	890 mV @ 4A	35 ns	5 µA @ 200 V	Through Hole	DO-201AA, DO-27, Axial	-65°C ~ 175°C	ROHS3 Compliant	Not Applicable	Active
MUR420RLG	onsemi	Diodes, Rectifiers	200 V	4A	890 mV @ 4A	35 ns	5 µA @ 200 V	Through Hole	DO-201AA, DO-27, Axial	-65°C ~ 175°C	ROHS3 Compliant	Not Applicable	Active
SBYV28-200-E3/73	Vishay General Semiconductor	Diodes, Rectifiers	200 V	3.5A	1.1 V @ 3.5A	20 ns	5 µA @ 200 V	Through Hole	DO-201AD, Axial	-55°C ~ 150°C	ROHS3 Compliant	1 (Unlimited)	Active
UG4D-E3/54	Vishay General Semiconductor	Diodes, Rectifiers	200 V	4A	950 mV @ 4A	30 ns	5 µA @ 200 V	Through Hole	DO-201AD, Axial	-55°C ~ 150°C	ROHS3 Compliant	1 (Unlimited)	Active
UG4D-E3/73	Vishay General Semiconductor	Diodes, Rectifiers	200 V	4A	950 mV @ 4A	30 ns	5 µA @ 200 V	Through Hole	DO-201AD, Axial	-55°C ~ 150°C	ROHS3 Compliant	1 (Unlimited)	Active

Engineering Selection Recommendations

All substitute diodes listed are currently active in production and are RoHS compliant with defined moisture sensitivity levels. Each substitute meets or exceeds the RN 4Z original specifications for reverse voltage, rectified current, fast recovery speed, reverse leakage current, and operating temperature. Substitution is feasible using these listed part numbers, as the RN 4Z is obsolete. Mechanical mounting and package/case compatibility are maintained in all alternatives. Regulatory requirements (RoHS, MSL) for direct replacement are also satisfied.

Frequently Asked Questions (FAQ)

Q: What key parameters must be matched for substituting the RN 4Z diode?
A: Substitutes must match maximum reverse voltage, average rectified current, maximum forward voltage drop, reverse recovery time, reverse leakage current, mounting type, package, and operating temperature range.

Q: Are the substitute diodes compatible in terms of mechanical fit?
A: All listed substitutes use axial packages designed for through-hole mounting, consistent with the RN 4Z mechanical specifications.

Q: How does reverse recovery time influence substitution selection?
A: Substitution is valid when the replacement diode's reverse recovery time does not exceed the specified 100 ns of RN 4Z, and all listed substitutes comply.

Q: What is the relevance of RoHS and moisture sensitivity (MSL) status?
A: Regulatory compliance (e.g., RoHS) and moisture sensitivity must meet or exceed specifications of the original device for direct substitution in new and legacy designs.

Q: Can substitute diodes handle the same or greater current and voltage ratings as RN 4Z?
A: All listed substitutions are rated for at least 3.5A average rectified current and 200 V maximum reverse voltage, directly matching RN 4Z capabilities.

Q: Is speed (reverse recovery) a concern for general-purpose rectification?
A: RN 4Z specifies fast recovery operation (≤500 ns, >200 mA Io), and all substitutes maintain this characteristic within strict parameter boundaries.

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