FR3K Equivalent & Substitute Parts Reference

Part Overview

The FR3K is a general-purpose rectifier diode manufactured by SMC Diode Solutions, rated for 800V DC reverse voltage and 3A average rectified current in a Surface Mount SMC (DO-214AB) package. This diode is classified as obsolete, making identification of active equivalent parts essential for ongoing design support and procurement continuity. The FR3K employs fast recovery technology with a reverse recovery time of 500 nanoseconds, suitable for standard rectification applications requiring moderate switching speeds.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	800	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 3 A	V
Reverse Recovery Time (trr)	500	ns
Current - Reverse Leakage @ Vr	5 @ 800 V	µA
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-65 to 150	°C
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution of the FR3K is determined by strict equivalence across the following critical electrical and mechanical parameters:

Voltage Rating: DC reverse voltage must equal 800V maximum
Current Rating: Average rectified current must equal 3A
Forward Voltage Drop: Maximum forward voltage at rated current must equal 1.3V @ 3A
Recovery Characteristics: Reverse recovery time must equal 500 nanoseconds (fast recovery classification)
Reverse Leakage: Maximum reverse leakage current must equal 5µA @ 800V
Package: Surface Mount DO-214AB (SMC) form factor required
Temperature Range: Operating junction temperature range must span -65°C to 150°C

The RS3K-13-F manufactured by Diodes Incorporated meets all specified electrical parameters and mechanical requirements, establishing it as a direct functional equivalent to the obsolete FR3K.

Parameter Comparison

Parameter	FR3K (SMC Diode Solutions)	RS3K-13-F (Diodes Incorporated)	Match Status
Voltage - DC Reverse (Vr) (Max)	800 V	800 V	Equivalent
Current - Average Rectified (Io)	3 A	3 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	1.3 V @ 3 A	Equivalent
Reverse Recovery Time (trr)	500 ns	500 ns	Equivalent
Current - Reverse Leakage @ Vr	5 µA @ 800 V	5 µA @ 800 V	Equivalent
Package / Case	DO-214AB, SMC	DO-214AB, SMC	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 150°C	Equivalent
Technology	Standard	Standard	Equivalent
Product Status	Obsolete	Active	Substitute is Active

Engineering Selection Recommendations

The RS3K-13-F from Diodes Incorporated is the direct equivalent substitute for the obsolete FR3K. Selection of the RS3K-13-F is based on the following engineering factors:

Electrical Equivalence: All critical electrical parameters match exactly, including voltage rating, current capacity, forward voltage drop, and reverse recovery characteristics. The diode operates within identical temperature ranges.

Package Compatibility: Both devices use the DO-214AB (SMC) Surface Mount package, ensuring mechanical and thermal compatibility with existing PCB layouts and assembly processes.

Product Status: The FR3K is obsolete, whereas the RS3K-13-F maintains active production status with confirmed inventory availability (10,179 pieces in stock), ensuring long-term procurement reliability.

Compliance: The RS3K-13-F carries ROHS3 compliance certification and maintains REACH Unaffected status, meeting current regulatory requirements. Both devices share identical ECCN (EAR99) and HTSUS (8541.10.0080) classifications.

Moisture Sensitivity: Both devices carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity constraints during storage or handling.

Frequently Asked Questions (FAQ)

Q: Can the RS3K-13-F be used as a direct replacement for the FR3K in existing designs?

A: Yes. The RS3K-13-F meets all electrical and mechanical specifications of the FR3K. No circuit modifications are required. The identical DO-214AB package ensures direct PCB compatibility.

Q: What is the primary reason for substituting the FR3K?

A: The FR3K is classified as obsolete. The RS3K-13-F is an active product with confirmed manufacturing and inventory availability, ensuring design continuity and supply chain reliability.

Q: Are there differences in forward voltage drop between these devices?

A: No. Both devices specify a maximum forward voltage of 1.3V at 3A, ensuring identical voltage drop characteristics in rectification circuits.

Q: Does the RS3K-13-F require different PCB layout considerations?

A: No. Both devices use the Surface Mount DO-214AB (SMC) package. PCB footprints, thermal management, and assembly processes remain unchanged.

Q: What is the difference in capacitance between the FR3K and RS3K-13-F?

A: The FR3K specifies 60pF @ 4V, 1MHz, while the RS3K-13-F specifies 50pF @ 4V, 1MHz. This 10pF difference does not affect functional equivalence in standard rectification applications, as both values fall within typical parasitic capacitance ranges for this device class.

Q: Are both devices RoHS compliant?

A: The RS3K-13-F carries ROHS3 compliance certification. The FR3K does not specify RoHS status in the provided data. The RS3K-13-F meets current environmental compliance requirements.

Q: What is the moisture sensitivity level for these devices?

A: Both devices carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity. Standard storage and handling procedures apply without special desiccant or humidity controls.

Q: Can the RS3K-13-F handle the same reverse voltage as the FR3K?

A: Yes. Both devices are rated for 800V DC reverse voltage maximum, with identical reverse leakage current of 5µA @ 800V.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message