CSFC304-G Equivalent & Substitute Parts Reference

Part Overview

The CSFC304-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 400 V DC reverse voltage and 3 A average rectified current in a Surface Mount DO-214AB (SMC) package. This component is classified as Active product status and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when electrical parameters, mechanical packaging, and operational characteristics align within the allowed specifications for this diode category. The following equivalent components maintain functional compatibility with the CSFC304-G in applications requiring 400 V / 3 A rectification in SMC surface mount form factor.

Key Parameters

Parameter	CSFC304-G Value	Unit	Substitution Relevance
Voltage - DC Reverse (Vr) (Max)	400	V	Critical - Must match or exceed
Current - Average Rectified (Io)	3	A	Critical - Must match or exceed
Voltage - Forward (Vf) (Max) @ If	1.25 @ 3 A	V	Important - Affects power dissipation
Reverse Recovery Time (trr)	35	ns	Important - Determines switching speed class
Current - Reverse Leakage @ Vr	5	µA @ 400 V	Important - Affects leakage characteristics
Package / Case	DO-214AB, SMC	-	Critical - Physical compatibility
Mounting Type	Surface Mount	-	Critical - Assembly compatibility
Operating Temperature - Junction (Max)	150	°C	Important - Thermal rating
RoHS Status	ROHS3 Compliant	-	Important - Regulatory compliance

Substitute Part Grouping Explanation

Substitution logic for the CSFC304-G is based on the following mandatory alignment criteria:

Critical Parameters (Must Match):

Voltage - DC Reverse (Vr): 400 V minimum
Current - Average Rectified (Io): 3 A minimum
Package / Case: DO-214AB or SMC equivalent
Mounting Type: Surface Mount

Important Parameters (Should Align):

Voltage - Forward (Vf) @ 3 A: Acceptable range 1.1 V to 1.5 V (affects thermal performance)
Reverse Recovery Time (trr): Fast Recovery (≤500 ns) or Standard Recovery (>500 ns) classification
Current - Reverse Leakage @ Vr: 5 µA to 10 µA range
Operating Temperature - Junction: Minimum -50°C to maximum 150°C or higher
RoHS3 Compliance: Required for regulatory alignment

Packaging Variants Accepted:

Tape & Reel (TR)
Cut Tape (CT)
Cut Tape & Digi-Reel®

All identified substitute parts meet the critical parameter requirements and maintain functional equivalence within the specified electrical and mechanical constraints.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf @ 3A (V)	trr (ns)	Ir @ Vr (µA)	Package	Temp Junction (°C)	Product Status
CSFC304-G	Comchip Technology	400	3	1.25	35	5 @ 400V	DO-214AB, SMC	150 (Max)	Active
ER3G-TP	Micro Commercial Co	400	3	1.25	35	5 @ 400V	DO-214AB, SMC	-50 to 175	Active
ES3G-E3/57T	Vishay General Semiconductor	400	3	1.1	50	10 @ 400V	DO-214AB, SMC	-55 to 150	Active
ES3GHE3_A/H	Vishay General Semiconductor	400	3	1.1	50	10 @ 400V	DO-214AB, SMC	-55 to 150	Active
RS3G-13-F	Diodes Incorporated	400	3	1.3	150	5 @ 400V	DO-214AB, SMC	-65 to 150	Active
S3G	Diotec Semiconductor	400	3	1.15	1500	5 @ 1700V	DO-214AB, SMC	-50 to 150	Active
S3G-13-F	Diodes Incorporated	400	3	1.15	Not specified	10 @ 400V	DO-214AB, SMC	-65 to 150	Active
S3G-TP	Micro Commercial Co	400	3	1.2	Not specified	10 @ 400V	DO-214AB, SMC	-55 to 150	Not For New Designs
STTH3R04S	STMicroelectronics	400	3	1.5	35	5 @ 400V	DO-214AB, SMC	175 (Max)	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

ER3G-TP (Micro Commercial Co) and STTH3R04S (STMicroelectronics) provide the closest electrical alignment to CSFC304-G. Both maintain identical reverse voltage (400 V), average rectified current (3 A), forward voltage (1.25 V @ 3 A), and reverse recovery time (35 ns). ER3G-TP extends the operating temperature range to -50°C to 175°C, while STTH3R04S reaches a maximum junction temperature of 175°C. Both are Active product status with RoHS3 compliance and unlimited MSL rating.

Secondary Substitutes (Acceptable Electrical Alignment):

ES3G-E3/57T and ES3GHE3_A/H (Vishay General Semiconductor) meet all critical parameters with lower forward voltage (1.1 V @ 3 A), reducing power dissipation. ES3GHE3_A/H includes AEC-Q101 automotive qualification. Reverse recovery time is 50 ns, slightly higher than the main part. Both maintain 400 V / 3 A ratings and RoHS3 compliance.

RS3G-13-F (Diodes Incorporated) and S3G-13-F (Diodes Incorporated) satisfy voltage and current requirements with extended temperature ranges (-65°C to 150°C). RS3G-13-F exhibits higher forward voltage (1.3 V @ 3 A) and longer reverse recovery time (150 ns), indicating standard recovery speed classification. Both are Active status with RoHS3 compliance.

Alternative Substitutes (Different Speed Classification):

S3G (Diotec Semiconductor) and S3G-13-F (Diodes Incorporated) operate in the standard recovery speed class (>500 ns trr), differing from the fast recovery classification of CSFC304-G. These components are suitable for applications where switching speed is not a limiting factor. S3G product status is Active; S3G-13-F is Active with RoHS3 compliance.

Not Recommended for New Designs:

S3G-TP (Micro Commercial Co) carries "Not For New Designs" product status and should not be selected for new circuit implementations.

Frequently Asked Questions (FAQ)

Q: Can I substitute CSFC304-G with any of the listed parts without circuit modification?

A: All listed substitute parts maintain the critical electrical parameters (400 V reverse voltage, 3 A average rectified current) and identical DO-214AB SMC package form factor. Direct substitution is electrically valid. However, forward voltage variations (1.1 V to 1.5 V range) and reverse recovery time differences (35 ns to 1500 ns) may affect thermal performance and switching characteristics in specific circuit topologies. Verify application requirements before substitution.

Q: What is the difference between Fast Recovery and Standard Recovery diodes in this list?

A: Fast Recovery diodes (trr ≤ 500 ns) include CSFC304-G, ER3G-TP, ES3G-E3/57T, ES3GHE3_A/H, and STTH3R04S. Standard Recovery diodes (trr > 500 ns) include S3G and S3G-13-F. Fast recovery types switch more rapidly, reducing switching losses in high-frequency applications. Standard recovery types are suitable for lower-frequency rectification circuits. Selection depends on circuit operating frequency.

Q: Are all substitute parts RoHS3 compliant?

A: Most substitute parts are RoHS3 compliant. S3G (Diotec Semiconductor) lists RoHS status as "Not applicable." Verify RoHS compliance requirements for your specific application and regulatory jurisdiction before final part selection.

Q: What is the significance of the operating temperature range differences?

A: CSFC304-G specifies maximum junction temperature of 150°C. ER3G-TP extends to 175°C, and STTH3R04S reaches 175°C maximum. RS3G-13-F and S3G-13-F support -65°C minimum operating temperature, compared to -50°C or -55°C for other parts. Select based on your application's thermal environment and temperature extremes.

Q: Can I use ES3GHE3_A/H in automotive applications?

A: ES3GHE3_A/H carries AEC-Q101 automotive qualification, making it suitable for automotive circuit applications. Other parts do not list automotive qualification. If automotive compliance is required, ES3GHE3_A/H is the designated choice among the substitutes.

Q: Why does S3G show reverse leakage current at 1700 V instead of 400 V?

A: S3G datasheet specifies reverse leakage current measurement at 1700 V, differing from the standard 400 V measurement used for other parts. This represents a different characterization methodology. For direct comparison at 400 V operating voltage, refer to manufacturer datasheets for equivalent leakage specifications.

Q: What packaging options are available for these substitute parts?

A: Substitute parts are available in Tape & Reel (TR), Cut Tape (CT), and Cut Tape & Digi-Reel® packaging formats. All maintain the same DO-214AB SMC physical form factor. Select packaging based on your assembly process requirements and component handling procedures.

Q: Is S3G-TP still available for purchase?

A: S3G-TP is marked "Not For New Designs" product status, indicating it is in end-of-life phase. While inventory may remain available (6,327 Pcs reported), this part should not be selected for new circuit designs. Use alternative Active status parts for new applications.

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