CSFB205-G Equivalent & Substitute Parts Reference

Part Overview

The CSFB205-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 ROHS3 Compliant certification and REACH Unaffected status.

Substitute parts are necessary when the primary part experiences supply constraints, extended lead times, or when design requirements permit alternative manufacturers while maintaining electrical and mechanical compatibility. All substitute relationships documented here are based strictly on matching electrical parameters, package specifications, and compliance certifications.

Key Parameters

Parameter	CSFB205-G Value	Unit	Substitution Relevance
Voltage - DC Reverse (Vr) (Max)	600	V	Critical - Must match or exceed
Current - Average Rectified (Io)	2	A	Critical - Must match or exceed
Voltage - Forward (Vf) (Max) @ If	1.3 @ 2 A	V	Important - Affects power dissipation
Reverse Recovery Time (trr)	35	ns	Important - Defines switching speed
Current - Reverse Leakage @ Vr	5	µA @ 600 V	Important - Affects leakage characteristics
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-	Important - Switching performance class
Package / Case	DO-214AA, SMB	-	Critical - Physical compatibility
Mounting Type	Surface Mount	-	Critical - Assembly compatibility
Operating Temperature - Junction (Max)	150	°C	Important - Thermal rating
RoHS Status	ROHS3 Compliant	-	Critical - Regulatory compliance

Substitute Part Grouping Explanation

Substitution logic for the CSFB205-G is based on the following criteria:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 2 A minimum
Package / Case: DO-214AA, SMB (physical and electrical compatibility)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Important Compatibility Parameters:

Voltage - Forward (Vf) (Max) @ If: Lower values preferred for reduced power dissipation
Reverse Recovery Time (trr): Fast Recovery classification (≤ 500ns, > 200mA) preferred for switching performance
Current - Reverse Leakage @ Vr: Lower values preferred for reduced standby current
Operating Temperature - Junction: Must support application thermal requirements

Acceptable Variations:

Forward voltage may vary within typical application tolerances
Reverse recovery time may vary within Fast Recovery classification
Reverse leakage current may vary within acceptable limits
Operating temperature maximum may exceed 150°C

Substitute parts are grouped by current rating (2 A primary group) and by speed classification (Fast Recovery preferred). Parts with higher current ratings (3 A) are listed as alternatives where thermal and electrical margins permit. Parts with lower current ratings (1 A) are not suitable substitutes for 2 A applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (V)	trr (ns)	Speed Class	Ir @ Vr (µA)	Tj (Max) °C	Product Status
CSFB205-G	Comchip Technology	600	2	1.3 @ 2 A	35	Fast Recovery	5 @ 600 V	150	Active
MURS160-E3/52T	Vishay General Semiconductor	600	2	1.25 @ 1 A	75	Fast Recovery	5 @ 600 V	175	Active
S2J	Nexperia USA Inc.	600	2	1.15 @ 2 A	2000	Standard Recovery	1 @ 600 V	150	Active
STTH1L06U	STMicroelectronics	600	1	1.3 @ 1 A	80	Fast Recovery	1 @ 600 V	175	Active
STTH1R06U	STMicroelectronics	600	1	1.7 @ 1 A	45	Fast Recovery	1 @ 600 V	175	Active
STTH2L06U	STMicroelectronics	600	2	1.3 @ 2 A	85	Fast Recovery	2 @ 600 V	175	Active
STTH3L06U	STMicroelectronics	600	3	1.3 @ 3 A	85	Fast Recovery	3 @ 600 V	175	Active
STTH3R06U	STMicroelectronics	600	3	1.7 @ 3 A	35	Fast Recovery	3 @ 600 V	175	Active
SURS8260T3G-VF01	onsemi	600	2	1.45 @ 2 A	75	Fast Recovery	5 @ 600 V	175	Not For New Designs

Engineering Selection Recommendations

Primary Substitutes (2 A Rating, Active Status):

MURS160-E3/52T and STTH2L06U are direct electrical equivalents to CSFB205-G. Both maintain 600 V reverse voltage and 2 A average rectified current ratings with Fast Recovery speed classification. MURS160-E3/52T offers lower forward voltage (1.25 V @ 1 A) and extended operating temperature range (-65°C to 175°C). STTH2L06U provides identical forward voltage characteristics (1.3 V @ 2 A) with extended operating temperature range (175°C maximum) and is available in higher inventory quantities (35,300 pcs).

S2J from Nexperia USA Inc. maintains 600 V and 2 A ratings with superior forward voltage performance (1.15 V @ 2 A) and lowest reverse leakage (1 µA @ 600 V). However, S2J is classified as Standard Recovery (2 µs trr) rather than Fast Recovery, which may affect switching performance in high-frequency applications. S2J is suitable for applications where switching speed is not critical and lower forward voltage dissipation is beneficial.

Secondary Substitutes (Higher Current Ratings, Active Status):

STTH3L06U and STTH3R06U are rated for 3 A average rectified current and provide design margin above the 2 A requirement. Both maintain 600 V reverse voltage and Fast Recovery classification. STTH3L06U offers forward voltage matching the original part (1.3 V @ 3 A), while STTH3R06U provides faster recovery time (35 ns) matching CSFB205-G. These parts are suitable when thermal or current margin is required.

Not Recommended for New Designs:

SURS8260T3G-VF01 carries "Not For New Designs" product status and should not be selected for new applications despite electrical compatibility.

Lower Current Alternatives (1 A Rating):

STTH1L06U and STTH1R06U are rated for 1 A average rectified current and do not meet the 2 A requirement of CSFB205-G. These parts are not suitable substitutes for applications requiring 2 A operation.

Frequently Asked Questions (FAQ)

Q: Can STTH1L06U or STTH1R06U replace CSFB205-G?

A: No. STTH1L06U and STTH1R06U are rated for 1 A average rectified current, while CSFB205-G is rated for 2 A. Using a 1 A part in a 2 A application will result in device overstress and failure. Current rating is a critical parameter that must not be reduced in substitution.

Q: What is the difference between Fast Recovery and Standard Recovery classifications?

A: Fast Recovery diodes have reverse recovery time ≤ 500 ns (> 200 mA Io), while Standard Recovery diodes have reverse recovery time > 500 ns. CSFB205-G is Fast Recovery (35 ns trr). S2J is Standard Recovery (2000 ns trr). Fast Recovery diodes are preferred for switching applications and high-frequency circuits. Standard Recovery diodes are suitable for low-frequency rectification where switching speed is not critical.

Q: Is SURS8260T3G-VF01 a valid substitute?

A: SURS8260T3G-VF01 meets all electrical and package requirements (600 V, 2 A, DO-214AA SMB, Fast Recovery, RoHS3 Compliant). However, it carries "Not For New Designs" product status. This designation indicates the manufacturer has discontinued active support for new applications. SURS8260T3G-VF01 may be used only in legacy or maintenance applications where supply from existing inventory is available.

Q: Why does MURS160-E3/52T have lower forward voltage at 1 A instead of 2 A?

A: Forward voltage specifications are provided at the test current specified by the manufacturer. MURS160-E3/52T specifies Vf at 1 A (1.25 V), while CSFB205-G specifies Vf at 2 A (1.3 V). These are manufacturer-specific test conditions and do not indicate incompatibility. Both parts are suitable for 2 A operation.

Q: Can I use STTH3L06U or STTH3R06U instead of CSFB205-G?

A: Yes. STTH3L06U and STTH3R06U are rated for 3 A average rectified current, which exceeds the 2 A requirement. Both maintain 600 V reverse voltage, DO-214AA SMB package, Fast Recovery classification, and RoHS3 compliance. Higher current rating provides design margin and is electrically compatible. These parts are suitable when thermal or current margin is required.

Q: What is the significance of Moisture Sensitivity Level (MSL) 1?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All listed parts carry MSL 1 rating, confirming equivalent moisture sensitivity characteristics.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed carry RoHS3 Compliant status and REACH Unaffected designation, matching the compliance profile of CSFB205-G. All parts are suitable for applications requiring RoHS3 compliance.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape (CT) and Tape & Reel (TR) refer to supply format, not component specifications. Both formats contain identical components in DO-214AA SMB packages. Cut Tape is supplied in smaller quantities on cut strips, while Tape & Reel is supplied on continuous reels for automated assembly. Component electrical and mechanical specifications are identical regardless of supply format.

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