CEFB201-G Equivalent & Substitute Parts Reference

Part Overview

The CEFB201-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 50V DC reverse voltage and 2A average rectified current in a DO-214AA (SMB) surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The fast recovery characteristic (≤500ns) and 25ns reverse recovery time position this diode for applications requiring rapid switching performance in power conversion and protection circuits.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	875 mV @ 2 A	mV
Speed Classification	Fast Recovery ≤500ns, >200mA (Io)	—
Reverse Recovery Time (trr)	25	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	150	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution validity for the CEFB201-G is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50V
Current - Average Rectified (Io): Must equal or exceed 2A
Package / Case: Must be DO-214AA or SMB equivalent
Mounting Type: Must be Surface Mount

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Lower or equal values preferred for efficiency
Speed Classification: Fast Recovery characteristic preferred for switching applications
Reverse Recovery Time (trr): Lower values preferred for high-frequency operation
Operating Temperature Range: Must accommodate application requirements
Compliance Status: RoHS3 compliance and REACH status for regulatory alignment

Substitute parts are grouped into two categories:

Category A - Full Parameter Match (Recommended): Parts meeting or exceeding all primary criteria with matching or superior secondary characteristics.

Category B - Partial Parameter Match (Conditional): Parts meeting primary voltage and package requirements but with reduced current rating or different speed classification. These require application-level verification.

Parameter Comparison

Parameter	CEFB201-G (Main)	ES2A-13-F	ES2A	MURS105T3G	S2A	S2A/54
Manufacturer	Comchip Technology	Diodes Incorporated	YAGEO	onsemi	Diotec Semiconductor	Vishay General Semiconductor
Product Status	Obsolete	Active	Active	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	50 V	50 V	50 V	50 V
Current - Average Rectified (Io)	2 A	2 A	—	1 A	2 A	1.5 A
Voltage - Forward (Vf) (Max) @ If	875 mV @ 2 A	920 mV @ 2 A	—	875 mV @ 1 A	1.15 V @ 2 A	1.15 V @ 1.5 A
Speed Classification	Fast Recovery ≤500ns, >200mA	Fast Recovery ≤500ns, >200mA	—	Fast Recovery ≤500ns, >200mA	Standard Recovery >500ns, >200mA	Standard Recovery >500ns, >200mA
Reverse Recovery Time (trr)	25 ns	25 ns	—	35 ns	1.5 µs	2 µs
Current - Reverse Leakage @ Vr	5 µA @ 50 V	5 µA @ 50 V	—	2 µA @ 50 V	5 µA @ 50 V	1 µA @ 50 V
Package / Case	DO-214AA, SMB	DO-214AA, SMB	DO-214AA	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction (Max)	150°C	150°C	—	175°C	150°C	150°C
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	Not Applicable	1 (Unlimited)

Engineering Selection Recommendations

Primary Recommendation: ES2A-13-F (Diodes Incorporated)

ES2A-13-F provides full parameter equivalence to CEFB201-G with identical voltage (50V), current (2A), forward voltage (920mV @ 2A), and reverse recovery time (25ns) specifications. The part is in active production status with ROHS3 compliance and MSL 1 rating. Packaging is DO-214AA SMB with surface mount configuration. This substitute is suitable for direct replacement in existing designs without circuit modification.

Secondary Recommendation: ES2A (YAGEO)

ES2A meets primary voltage and package requirements with active product status and ROHS3 compliance. Detailed electrical specifications are not fully provided in the reference data. This part is available in high inventory (26,200 pcs) and represents a cost-effective alternative when full parameter matching is not critical.

Conditional Recommendation: MURS105T3G (onsemi)

MURS105T3G meets voltage and package requirements but is rated for 1A average rectified current, which is 50% of the CEFB201-G specification. This part is suitable only for applications where the actual circuit current requirement does not exceed 1A. The part offers superior operating temperature range (-65°C to 175°C) and lower reverse leakage (2µA @ 50V). ROHS3 compliance and active status are confirmed.

Not Recommended: S2A (Diotec Semiconductor)

While S2A matches voltage and current ratings (50V, 2A), it employs standard recovery characteristics (>500ns) with 1.5µs reverse recovery time, significantly slower than the CEFB201-G fast recovery specification (25ns). This part is suitable only for applications where switching speed is not a design constraint. RoHS compliance status is not confirmed.

Not Recommended: S2A/54 (Vishay General Semiconductor)

S2A/54 is rated for 1.5A average rectified current, below the 2A requirement. Additionally, this part is RoHS non-compliant, which may conflict with regulatory requirements for new designs. Standard recovery characteristics (2µs trr) do not match the fast recovery specification.

Frequently Asked Questions (FAQ)

Q1: Can MURS105T3G replace CEFB201-G in all applications?

No. MURS105T3G is rated for 1A average rectified current versus the CEFB201-G 2A rating. Substitution is valid only if the actual circuit current requirement does not exceed 1A. Exceeding this limit will cause thermal stress and potential component failure.

Q2: What is the significance of fast recovery versus standard recovery classification?

Fast recovery diodes (≤500ns) are designed for high-frequency switching applications such as switched-mode power supplies and inverters. Standard recovery diodes (>500ns) are suitable for lower-frequency rectification. The CEFB201-G fast recovery characteristic indicates the original design operates at higher switching frequencies. Substituting with a standard recovery part (S2A, S2A/54) may cause excessive switching losses and heat generation.

Q3: Why is ES2A-13-F the primary recommendation?

ES2A-13-F provides complete electrical equivalence: 50V reverse voltage, 2A current rating, 25ns reverse recovery time, and 920mV forward voltage at 2A. The 45mV difference in forward voltage (920mV vs 875mV) is within typical manufacturing tolerance and does not affect circuit functionality. Active production status, ROHS3 compliance, and confirmed MSL 1 rating ensure supply chain continuity and regulatory alignment.

Q4: Are there package compatibility concerns between DO-214AA and SMB designations?

No. DO-214AA and SMB are equivalent package designations for the same physical form factor. Both refer to a surface mount diode package with identical pin configuration and footprint. Parts specified as either DO-214AA or SMB are mechanically and electrically interchangeable on the same PCB layout.

Q5: What does MSL 1 (Unlimited) mean for component handling?

MSL 1 (Moisture Sensitivity Level 1) indicates the component has unlimited shelf life and requires no special moisture control during storage or handling. This is the least restrictive moisture classification and simplifies inventory management and assembly processes.

Q6: Can S2A be used as a substitute despite incomplete specification data?

S2A meets the primary voltage (50V) and current (2A) requirements with confirmed ROHS3 compliance and active production status. However, the absence of detailed electrical specifications (forward voltage, reverse recovery time) in the reference data prevents full equivalence verification. Use of S2A requires obtaining complete datasheets from the manufacturer and application-level testing to confirm performance in the specific circuit.

Q7: Why is RoHS compliance status important for substitution?

RoHS (Restriction of Hazardous Substances) compliance is a regulatory requirement in many markets. ROHS3 compliant parts (ES2A-13-F, ES2A, MURS105T3G, S2A) are suitable for designs targeting EU and similar regulatory jurisdictions. S2A/54 is RoHS non-compliant and may not be acceptable for new product designs subject to these regulations.

Q8: What is the impact of reverse leakage current differences?

Reverse leakage current affects power dissipation and circuit performance in high-impedance applications. CEFB201-G and most substitutes specify 5µA @ 50V. MURS105T3G (2µA) and S2A/54 (1µA) have lower leakage, which is advantageous for low-power circuits. Higher leakage values do not prevent substitution but may increase standby power consumption.

Q9: How do operating temperature ranges affect substitution decisions?

CEFB201-G specifies maximum junction temperature of 150°C. ES2A-13-F, S2A, and S2A/54 also support 150°C maximum. MURS105T3G supports 175°C maximum, providing additional thermal margin. If the application operates near the 150°C limit, MURS105T3G offers improved reliability, provided the 1A current rating is acceptable.

Q10: Is inventory availability a factor in substitution selection?

Yes. ES2A has the highest inventory (26,200 pcs), followed by ES2A-13-F (10,400 pcs) and MURS105T3G (10,400 pcs). S2A/54 has the lowest inventory (976 pcs). For high-volume production, parts with higher inventory availability reduce supply chain risk. However, inventory levels change over time and should be verified with suppliers before final design decisions.

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