CFRB305-G Equivalent & Substitute Parts Reference

Part Overview

The CFRB305-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 600 V DC reverse voltage and 3 A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for design continuity and procurement planning. Substitute parts must maintain electrical compatibility across voltage, current, and thermal specifications while accommodating available product status and supply chain conditions.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	1.3	V @ 3 A
Reverse Recovery Time (trr)	250	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Capacitance @ Vr, F	50	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-65 to 150	°C
Mounting Type	Surface Mount	—

Substitute Part Grouping Explanation

Substitution eligibility for the CFRB305-G is determined by the following criteria:

Primary Substitution Criteria (Mandatory Match):

Voltage - DC Reverse (Vr) (Max): 600 V
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount
Operating Temperature Range: Must encompass or equal -65°C to 150°C

Secondary Substitution Criteria (Functional Compatibility):

Current - Average Rectified (Io): Equal to or greater than 3 A
Voltage - Forward (Vf) (Max): Equal to or less than 1.3 V at rated current
Reverse Recovery Time (trr): Equal to or less than 250 ns (fast recovery classification)
Current - Reverse Leakage @ Vr: Equal to or less than 5 µA @ 600 V

Parts are grouped into two categories:

Direct Equivalents: Parts meeting all primary and secondary criteria with identical or superior electrical performance.

Functional Substitutes: Parts meeting primary criteria and core electrical requirements but with variations in secondary parameters that do not compromise circuit function within the specified operating envelope.

Parameter Comparison

Parameter	CFRB305-G (Main)	RS3JB-13-F	RS1JB-13-F	S2JH
Manufacturer	Comchip Technology	Diodes Incorporated	Diodes Incorporated	Taiwan Semiconductor Corporation
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	600 V	600 V	600 V	600 V
Current - Average Rectified (Io)	3 A	3 A	1 A	2 A
Voltage - Forward (Vf) (Max) @ If	1.3 V @ 3 A	1.3 V @ 3 A	1.3 V @ 1 A	1.15 V @ 2 A
Speed Classification	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Fast Recovery ≤ 500ns	Standard Recovery > 500ns
Reverse Recovery Time (trr)	250 ns	250 ns	250 ns	1.5 µs
Current - Reverse Leakage @ Vr	5 µA @ 600 V	5 µA @ 600 V	5 µA @ 600 V	1 µA @ 600 V
Capacitance @ Vr, F	50 pF @ 4V, 1MHz	50 pF @ 4V, 1MHz	15 pF @ 4V, 1MHz	30 pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-65 to 150 °C	-65 to 150 °C	-65 to 150 °C	-55 to 150 °C
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Qualification	Not specified	Not specified	Not specified	AEC-Q101

Engineering Selection Recommendations

RS3JB-13-F (Diodes Incorporated) — Direct Equivalent

RS3JB-13-F is the primary substitute for CFRB305-G. This part maintains identical electrical specifications across all critical parameters: 600 V reverse voltage, 3 A average rectified current, 1.3 V forward voltage at 3 A, 250 ns reverse recovery time, and 50 pF capacitance. The part is in active product status with ROHS3 compliance and 3402 units in stock. Operating temperature range matches the original specification (-65°C to 150°C). This part is suitable for direct replacement in all applications where CFRB305-G was originally specified.

S2JH (Taiwan Semiconductor Corporation) — Functional Substitute

S2JH is a functional substitute applicable to circuits where the 3 A current rating is not fully utilized or where lower current operation is acceptable. This part meets the 600 V voltage requirement and DO-214AA package specification. However, it differs in current rating (2 A versus 3 A), forward voltage (1.15 V @ 2 A), and recovery characteristics (1.5 µs standard recovery versus 250 ns fast recovery). S2JH includes AEC-Q101 automotive qualification and ROHS3 compliance. The minimum operating temperature is -55°C, which is 10°C higher than the original specification. Use S2JH only in applications where 2 A current capacity is sufficient and standard recovery speed is acceptable.

RS1JB-13-F (Diodes Incorporated) — Limited Substitute

RS1JB-13-F is not recommended as a substitute for CFRB305-G due to insufficient current rating. This part is rated for 1 A average rectified current, which is below the 3 A requirement of the original component. Although it maintains 600 V voltage rating, 250 ns recovery time, and identical package specifications, the reduced current capacity makes it unsuitable for direct replacement. RS1JB-13-F may be considered only in redesigned circuits where current requirements have been reduced to 1 A or less.

Frequently Asked Questions (FAQ)

Q: Can RS3JB-13-F replace CFRB305-G in all applications?

A: Yes. RS3JB-13-F is electrically and mechanically equivalent to CFRB305-G. Both parts share identical voltage (600 V), current (3 A), forward voltage (1.3 V @ 3 A), recovery time (250 ns), and operating temperature range (-65°C to 150°C). The DO-214AA package and surface mount configuration are identical. RS3JB-13-F is in active production status with full RoHS3 compliance.

Q: Why is S2JH listed as a substitute if it has different current and recovery specifications?

A: S2JH is listed as a functional substitute because it meets the primary substitution criteria: 600 V voltage rating and DO-214AA package. However, the 2 A current rating is lower than the original 3 A specification, and the 1.5 µs recovery time is significantly slower than the 250 ns fast recovery of CFRB305-G. S2JH is suitable only for circuits where these parameter differences do not compromise performance. Applications requiring the full 3 A capacity or fast recovery characteristics must use RS3JB-13-F.

Q: What is the minimum operating temperature difference between CFRB305-G and S2JH?

A: CFRB305-G operates from -65°C to 150°C, while S2JH operates from -55°C to 150°C. The minimum temperature difference is 10°C. If the circuit requires operation below -55°C, S2JH is not suitable. RS3JB-13-F maintains the full -65°C to 150°C range.

Q: Are all substitute parts RoHS3 compliant?

A: RS3JB-13-F and RS1JB-13-F are explicitly marked as ROHS3 Compliant. S2JH is also ROHS3 Compliant. The original CFRB305-G does not specify RoHS status in the provided data. All three substitute parts meet current RoHS3 requirements.

Q: Can RS1JB-13-F be used in a circuit designed for 3 A?

A: No. RS1JB-13-F is rated for 1 A average rectified current, which is insufficient for a circuit requiring 3 A. Using an undersized component will result in excessive junction temperature, reduced reliability, and potential component failure. Use RS3JB-13-F for 3 A applications.

Q: What is the difference between fast recovery (250 ns) and standard recovery (1.5 µs)?

A: Recovery time is the interval required for a diode to transition from forward conduction to reverse blocking after the applied voltage reverses. Fast recovery (250 ns) is suitable for high-frequency switching applications and power conversion circuits. Standard recovery (1.5 µs) is acceptable for lower-frequency rectification and general-purpose applications. If the original circuit was designed for fast recovery characteristics, S2JH may introduce switching losses and reduced efficiency.

Q: Is the package designation "DO-214AA, SMB" the same across all parts?

A: Yes. All parts listed—CFRB305-G, RS3JB-13-F, RS1JB-13-F, and S2JH—use the DO-214AA (SMB) package. This ensures mechanical and thermal compatibility on the PCB. However, verify that the supplier device package designation matches your assembly requirements, as some manufacturers may use alternative nomenclature.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message