RK 39 Equivalent & Substitute Parts Reference

Part Overview

RK 39 is a Schottky diode manufactured by Sanken Electric USA Inc., classified under the Diodes, Rectifiers category. This device features a maximum reverse voltage of 90 V, a forward current of 2A, and fast recovery speed suitable for high-frequency rectification tasks. The product is provided in an axial, through-hole package. RK 39 has been classified as Obsolete; therefore, identifying direct substitute parts is crucial for ensuring ongoing product maintenance, legacy system support, and replacement in existing designs where the original component is no longer available.

Substiute Parts

RK 39

Sanken Electric USA Inc.In Stock: 811RK 39 Datasheet

Current PartRFQ

SB3H90-E3/54

Vishay General Semiconductor - Diodes DivisionIn Stock: 2391SB3H90-E3/54 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for RK 39 are grouped based on matching the following key electrical and mechanical parameters:

• Category: Diodes, Rectifiers
• Technology: Schottky
• Voltage - DC Reverse (Vr) (Max): 90 V
• Current - Average Rectified (Io): must be ≥ 2A
• Voltage - Forward (Vf) (Max): must not exceed the RK 39 value at equivalent If
• Speed: Must be fast recovery (≤ 500ns)
• Mounting Type: Through Hole
• Package / Case: Comparable Axial form factor

Only parts explicitly matching these parameters are considered functional substitutes. Package and RoHS compliance are included as substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

RK 39 is classified as Obsolete; the substitute part SB3H90-E3/54 is Active and shares RoHS and ECCN classifications with unlimited MSL. Both parts are in the Diodes, Rectifiers category and are through-hole, axial Schottky diodes, compliant with environmental and trade regulations as indicated. Selection between these parts is based strictly on product status and compliance, without consideration of parameters not explicitly listed.

Frequently Asked Questions (FAQ)

Q1: What are the most important criteria for substituting RK 39 in a design?
A1: Substitution is based on matching the electrical class (Schottky), voltage rating (90 V), current rating (at least 2A), rectification speed, through-hole axial package, and compliance indications.

Q2: Is SB3H90-E3/54 a direct mechanical substitute for RK 39?
A2: Both parts use an axial, through-hole form factor suitable for most applications where RK 39 was specified.

Q3: Are there differences in environmental compliance between RK 39 and SB3H90-E3/54?
A3: Both models are RoHS compliant and classified as ECCN EAR99.

Q4: Does the substitute part offer different electrical characteristics within the allowed parameters?
A4: SB3H90-E3/54 offers a higher average rectified current (3A) and a slightly lower forward voltage at a higher forward current, which is within allowed substitution criteria.

Q5: Are there considerations regarding MSL (Moisture Sensitivity Level) when substituting?
A5: Both RK 39 and SB3H90-E3/54 have MSL 1 (Unlimited), so no precautions are necessary regarding moisture sensitivity.