CFRB205-G Equivalent & Substitute Parts Reference

Part Overview

The CFRB205-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 600 V DC reverse voltage and 2 A average rectified current in a Surface Mount DO-214AA (SMB) package. This component is classified as Active product status and is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are necessary when the original CFRB205-G is unavailable, when alternative sourcing is required for supply chain optimization, or when design flexibility permits selection from qualified alternatives meeting the same electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.3 @ 2 A	V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	250	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Mounting Type	Surface Mount	-
Package / Case	DO-214AA, SMB	-
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution eligibility for the CFRB205-G is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal 600 V
Current - Average Rectified (Io): Must equal or exceed 2 A
Package / Case: Must be DO-214AA (SMB) Surface Mount
Mounting Type: Must be Surface Mount

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Lower values indicate improved efficiency; values at or below 1.3 V @ 2 A are compatible
Reverse Recovery Time (trr): Faster recovery (lower values) indicates superior performance; values at or below 250 ns maintain or improve upon the original specification
Current - Reverse Leakage @ Vr: Lower values indicate superior reverse blocking; values at or below 5 µA @ 600 V are acceptable
RoHS Status: ROHS3 Compliant status required for regulatory compliance

Parts meeting all primary criteria are direct substitutes. Parts exceeding current rating (3 A) or offering faster recovery characteristics remain functionally compatible for the 2 A application.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [V]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Tj (Max) [°C]	Product Status
CFRB205-G	Comchip Technology	600	2	1.3 @ 2 A	Fast Recovery ≤ 500ns	250	5 @ 600 V	DO-214AA (SMB)	150	Active
S2J	Nexperia USA Inc.	600	2	1.15 @ 2 A	Standard Recovery >500ns	2000	1 @ 600 V	DO-214AA (SMB)	150	Active
STTH1L06U	STMicroelectronics	600	1	1.3 @ 1 A	Fast Recovery ≤ 500ns	80	1 @ 600 V	DO-214AA (SMB)	175	Active
STTH1R06U	STMicroelectronics	600	1	1.7 @ 1 A	Fast Recovery ≤ 500ns	45	1 @ 600 V	DO-214AA (SMB)	175	Active
STTH2L06U	STMicroelectronics	600	2	1.3 @ 2 A	Fast Recovery ≤ 500ns	85	2 @ 600 V	DO-214AA (SMB)	175	Active
STTH2R06U	STMicroelectronics	600	2	1.7 @ 2 A	Fast Recovery ≤ 500ns	50	2 @ 600 V	DO-214AA (SMB)	175	Active
STTH3L06U	STMicroelectronics	600	3	1.3 @ 3 A	Fast Recovery ≤ 500ns	85	3 @ 600 V	DO-214AA (SMB)	175	Active
STTH3R06U	STMicroelectronics	600	3	1.7 @ 3 A	Fast Recovery ≤ 500ns	35	3 @ 600 V	DO-214AA (SMB)	175	Active
SURS8260T3G-VF01	onsemi	600	2	1.45 @ 2 A	Fast Recovery ≤ 500ns	75	5 @ 600 V	DO-214AA (SMB)	175	Not For New Designs

Engineering Selection Recommendations

Direct Substitutes (Equivalent Current Rating - 2 A):

The following parts are direct substitutes for CFRB205-G, meeting the 2 A current requirement and 600 V voltage specification:

STTH2L06U (STMicroelectronics): Matches forward voltage specification (1.3 V @ 2 A) with improved reverse recovery time (85 ns vs. 250 ns). Operating temperature range extended to 175°C. Active product status. ROHS3 compliant.
STTH2R06U (STMicroelectronics): Meets voltage and current specifications with faster reverse recovery (50 ns). Higher forward voltage (1.7 V @ 2 A). Operating temperature range -40°C to 175°C. Active product status. ROHS3 compliant.
S2J (Nexperia USA Inc.): Meets 2 A current and 600 V voltage with lower forward voltage (1.15 V @ 2 A). Standard recovery speed (>500ns). Lower reverse leakage (1 µA @ 600 V). Active product status.
SURS8260T3G-VF01 (onsemi): Meets 2 A and 600 V specifications with automotive qualification (AEC-Q101). Not For New Designs status limits applicability to legacy or maintenance applications only.

Higher Current Alternatives (3 A Rating):

STTH3L06U and STTH3R06U (STMicroelectronics): Exceed current requirement with 3 A rating. Both maintain 600 V voltage specification and DO-214AA package. STTH3L06U matches forward voltage (1.3 V @ 3 A); STTH3R06U offers faster recovery (35 ns). Active product status. ROHS3 compliant.

Lower Current Alternatives (1 A Rating):

STTH1L06U and STTH1R06U (STMicroelectronics): Reduced current rating (1 A) limits application to circuits not requiring full 2 A capacity. Both maintain 600 V specification and DO-214AA package. Active product status. ROHS3 compliant.

Compliance and Regulatory Status:

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity level. STTH series parts from STMicroelectronics offer extended operating temperature range (175°C vs. 150°C), providing thermal margin for demanding applications. SURS8260T3G-VF01 carries automotive qualification but is designated Not For New Designs, restricting use to replacement or legacy applications.

Frequently Asked Questions (FAQ)

Q: Can STTH1L06U or STTH1R06U replace CFRB205-G in a 2 A application?

A: No. STTH1L06U and STTH1R06U are rated for 1 A average rectified current, which is insufficient for applications requiring 2 A. These parts are not suitable substitutes for the CFRB205-G in circuits designed for 2 A operation.

Q: What is the difference between STTH2L06U and STTH2R06U?

A: Both parts meet the 2 A and 600 V specifications. STTH2L06U has forward voltage of 1.3 V @ 2 A with reverse recovery time of 85 ns. STTH2R06U has forward voltage of 1.7 V @ 2 A with faster reverse recovery time of 50 ns. Selection depends on whether lower forward voltage drop or faster switching is prioritized.

Q: Is S2J a suitable substitute for CFRB205-G?

A: Yes. S2J meets the 2 A current and 600 V voltage requirements in DO-214AA package. S2J offers lower forward voltage (1.15 V @ 2 A) and lower reverse leakage (1 µA @ 600 V). However, S2J uses standard recovery speed (>500ns) compared to CFRB205-G fast recovery (≤500ns), which may affect switching performance in high-frequency applications.

Q: Can STTH3L06U or STTH3R06U be used instead of CFRB205-G?

A: Yes. Both STTH3L06U and STTH3R06U are functionally compatible as they exceed the 2 A requirement with 3 A rating and maintain 600 V specification in DO-214AA package. These parts provide design margin for current capacity and are Active products with extended operating temperature (175°C). Selection between L and R variants follows the same logic as STTH2 series.

Q: Why is SURS8260T3G-VF01 marked "Not For New Designs"?

A: SURS8260T3G-VF01 carries Not For New Designs status, indicating the manufacturer is phasing out this part. While it meets electrical specifications (2 A, 600 V, DO-214AA), it should be used only for replacement or legacy applications where supply continuity is critical. New designs should select from Active status alternatives such as STTH2L06U, STTH2R06U, or S2J.

Q: Does package compatibility matter when selecting a substitute?

A: Yes. All listed substitutes use DO-214AA (SMB) Surface Mount package, matching CFRB205-G. Package compatibility ensures mechanical fit on PCB layouts and reflow soldering compatibility. Do not substitute with parts using different packages (such as DO-41 or other SMB variants) without PCB redesign.

Q: What is the significance of reverse recovery time (trr) in substitute selection?

A: Reverse recovery time affects switching speed and electromagnetic interference (EMI) characteristics. CFRB205-G specifies 250 ns. Substitutes with lower trr values (such as STTH2R06U at 50 ns or STTH3R06U at 35 ns) switch faster, reducing switching losses and EMI. Substitutes with higher trr values (such as S2J at 2000 ns) are slower but may be acceptable in low-frequency applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of CFRB205-G. All parts also carry MSL 1 (Unlimited) moisture sensitivity level, indicating no special moisture protection is required during storage or handling.

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