CEFA201-G Equivalent & Substitute Parts Reference

Part Overview

The CEFA201-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 50 V DC reverse voltage and 2 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. Substitute diodes must maintain electrical compatibility across voltage, current, and thermal specifications while meeting modern compliance standards.

Key Parameters

Parameter	CEFA201-G Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 2 A	mV
Reverse Recovery Time (trr)	25	ns
Current - Reverse Leakage @ Vr	5 µA @ 50 V	µA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction (Max)	150	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the CEFA201-G are selected based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 2 A
Package / Case: Must be DO-214AC or SMA equivalent
Mounting Type: Must be Surface Mount
Speed Classification: Must support Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Forward voltage (Vf) within acceptable circuit operating margins
Reverse recovery time (trr) and leakage current characteristics
Operating temperature range and thermal performance
Compliance certifications (RoHS, REACH)

Parts are grouped into two categories:

Group 1 - Direct Electrical Equivalents (50 V, 2 A): These parts maintain identical voltage and current ratings with matching or superior performance characteristics.

Group 2 - Voltage-Elevated Alternatives (100 V, 2 A): These parts exceed the reverse voltage specification and are suitable for applications requiring additional voltage margin, though they are not direct replacements.

Group 3 - Current-Reduced Alternatives (50 V, 1 A): These parts reduce the current rating and are not suitable as direct substitutes for 2 A applications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	trr [ns]	Ir @ Vr [µA]	Package	Product Status	RoHS Status
CEFA201-G	Comchip Technology	50	2	920 @ 2 A	25	5 @ 50 V	DO-214AC (SMA)	Obsolete	—
ES2AA-13-F	Diodes Incorporated	50	2	920 @ 2 A	25	5 @ 50 V	DO-214AC (SMA)	Active	ROHS3 Compliant
BYG22A-E3/TR	Vishay General Semiconductor - Diodes Division	50	2	1100 @ 2 A	25	1 @ 50 V	DO-214AC (SMA)	Active	ROHS3 Compliant
MURA105T3G	onsemi	50	2	875 @ 1 A	30	2 @ 50 V	DO-214AC (SMA)	Active	ROHS3 Compliant
MURA205T3G	onsemi	50	2	940 @ 2 A	30	2 @ 50 V	DO-214AC (SMA)	Active	ROHS3 Compliant
MURA210T3G	onsemi	100	2	940 @ 2 A	30	2 @ 100 V	DO-214AC (SMA)	Active	ROHS3 Compliant
RS1A	Taiwan Semiconductor Corporation	50	1	1300 @ 1 A	150	5 @ 50 V	DO-214AC (SMA)	Active	ROHS3 Compliant
S1A-E3/61T	Vishay General Semiconductor - Diodes Division	50	1	1100 @ 1 A	1800	1 @ 50 V	DO-214AC (SMA)	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute - Direct Replacement:

ES2AA-13-F (Diodes Incorporated) is the optimal direct substitute for CEFA201-G. This part maintains identical electrical specifications: 50 V reverse voltage, 2 A average rectified current, 920 mV forward voltage at 2 A, and 25 ns reverse recovery time. The part is in active production status with ROHS3 compliance certification, ensuring long-term availability and regulatory compliance. Packaging is DO-214AC (SMA) surface mount, identical to the original component. Inventory availability is substantial (21,393 pcs), supporting immediate procurement.

Secondary Substitute - Enhanced Performance:

MURA205T3G (onsemi) provides equivalent electrical performance with 50 V / 2 A ratings and 940 mV forward voltage at 2 A. Reverse recovery time is 30 ns, marginally longer than the original 25 ns specification. This part is active production with ROHS3 compliance. Operating temperature range extends to -65°C to 175°C, exceeding the original 150°C maximum. Inventory is available (23,933 pcs).

Alternative with Voltage Margin:

MURA210T3G (onsemi) provides 100 V reverse voltage rating with 2 A current capacity, suitable for applications requiring additional voltage safety margin. Forward voltage is 940 mV at 2 A. This part is active production with ROHS3 compliance and extended temperature range (-65°C to 175°C). Use this substitute only when circuit design permits higher voltage rating.

Not Recommended for Direct Substitution:

RS1A and S1A-E3/61T are rated for 1 A average rectified current, below the 2 A requirement of CEFA201-G. These parts are unsuitable for direct replacement in 2 A applications.

BYG22A-E3/TR (Vishay) uses avalanche diode technology rather than standard rectifier technology. While electrical ratings match (50 V, 2 A), the different technology classification and higher forward voltage (1.1 V vs. 920 mV) may affect circuit performance. This part is suitable only when avalanche characteristics are specifically required.

Frequently Asked Questions (FAQ)

Q1: Can ES2AA-13-F directly replace CEFA201-G without circuit modification?

A: Yes. ES2AA-13-F maintains identical electrical specifications across all critical parameters: 50 V reverse voltage, 2 A average rectified current, 920 mV forward voltage at 2 A, and 25 ns reverse recovery time. Package and mounting type are identical (DO-214AC, SMA surface mount). No circuit modification is required.

Q2: What is the difference between MURA205T3G and MURA210T3G?

A: MURA205T3G is rated for 50 V reverse voltage, matching the original CEFA201-G specification. MURA210T3G is rated for 100 V reverse voltage. Both support 2 A average rectified current. MURA210T3G is suitable only when the circuit design permits or requires higher voltage rating.

Q3: Why is RS1A not recommended as a substitute?

A: RS1A is rated for 1 A average rectified current, while CEFA201-G is rated for 2 A. Using a 1 A diode in a 2 A application exceeds the component's current capacity and creates reliability risk. RS1A is not a suitable substitute.

Q4: Are all substitute parts RoHS compliant?

A: All active production substitute parts listed (ES2AA-13-F, BYG22A-E3/TR, MURA105T3G, MURA205T3G, MURA210T3G, RS1A, S1A-E3/61T) carry ROHS3 compliance certification. The original CEFA201-G does not specify RoHS status due to its obsolete classification.

Q5: What is the significance of reverse recovery time (trr) differences?

A: Reverse recovery time affects switching speed and switching losses in rectifier applications. CEFA201-G specifies 25 ns. ES2AA-13-F matches this specification exactly. MURA series parts specify 30 ns, a 5 ns difference that may be acceptable in most applications but should be verified for high-frequency switching circuits. S1A-E3/61T specifies 1800 ns (standard recovery), unsuitable for fast-switching applications.

Q6: Can MURA105T3G be used as a substitute?

A: MURA105T3G is rated for 50 V / 2 A, matching the voltage and current requirements. However, forward voltage is specified at 1 A (875 mV @ 1 A) rather than at 2 A, making direct comparison with CEFA201-G (920 mV @ 2 A) difficult. Reverse recovery time is 30 ns versus 25 ns. This part is acceptable if circuit design tolerates these parameter variations, but ES2AA-13-F or MURA205T3G are preferred for direct substitution.

Q7: What packaging options are available for substitutes?

A: All substitute parts use DO-214AC (SMA) surface mount package, identical to CEFA201-G. Packaging variants differ only in tape format: Tape & Reel (TR), Cut Tape (CT) & Digi-Reel®. These are procurement format variations, not functional differences. Select based on assembly line requirements.

Q8: Is BYG22A-E3/TR suitable for general-purpose rectification?

A: BYG22A-E3/TR is classified as an avalanche diode rather than a standard general-purpose rectifier. While electrical ratings match (50 V, 2 A), avalanche technology provides different reverse breakdown characteristics. This part is suitable only when avalanche protection characteristics are specifically required by circuit design. For standard rectification, ES2AA-13-F is the appropriate choice.

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