CEFB205-G Equivalent & Substitute Parts Reference

Part Overview

The CEFB205-G is a superfast recovery rectifier diode manufactured by Comchip Technology, rated for 600V DC reverse voltage with 2A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

The CEFB205-G features a 50 ns reverse recovery time, enabling fast switching applications. With 4200 pieces currently in stock, this reference establishes electrical and mechanical compatibility criteria for identifying suitable replacement diodes from active manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	1.25 @ 2 A	V
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction (Max)	150	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the CEFB205-G are grouped based on the following electrical and mechanical compatibility criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V minimum
Current - Average Rectified (Io): 2A or greater
Package / Case: DO-214AA (SMB) surface mount
Mounting Type: Surface Mount
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Factors:

Reverse Recovery Time (trr): Fast recovery classification (≤ 500ns, > 200mA)
Forward Voltage (Vf): Within acceptable operating range for 600V rectifier diodes
Reverse Leakage Current: ≤ 5 µA @ 600 V

Grouping Categories:

Group A - Direct Current Rating Match (2A @ 600V, Fast Recovery): Parts with identical 2A current rating and fast recovery characteristics, suitable for direct replacement in applications requiring the original performance envelope.

Group B - Reduced Current Rating (1A @ 600V, Fast Recovery): Parts with 1A current rating but matching 600V voltage and fast recovery speed. These are suitable for applications where the circuit current demand does not exceed 1A.

Group C - Increased Current Rating (3A @ 600V): Parts with 3A current rating at 600V. These provide additional current capacity and are suitable for applications requiring higher current handling.

Group D - Standard Recovery Alternative (2A @ 600V, Standard Recovery): Parts with 2A current rating and standard recovery characteristics (>500ns). These are suitable for applications where fast recovery is not a critical requirement.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (V)	trr (ns)	Speed	Package	Status
CEFB205-G	Comchip Technology	600	2	1.25 @ 2A	50	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Obsolete
MURS160HE3_A/I	Vishay General Semiconductor	600	2	1.25 @ 1A	75	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
MURS160T3G	onsemi	600	1	1.25 @ 1A	75	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
MURS260-E3/5BT	Vishay General Semiconductor	600	2	1.45 @ 2A	75	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
S2J	Nexperia USA Inc.	600	2	1.15 @ 2A	2000	Standard Recovery >500ns	DO-214AA (SMB)	Active
S3JB	HY Electronic (Cayman) Limited	600	3	1.1 @ 3A	—	Standard Recovery >500ns	DO-214AA (SMB)	Active
STTH1L06U	STMicroelectronics	600	1	1.3 @ 1A	80	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
STTH1R06U	STMicroelectronics	600	1	1.7 @ 1A	45	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
STTH2L06U	STMicroelectronics	600	2	1.3 @ 2A	85	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
STTH2R06U	STMicroelectronics	600	2	1.7 @ 2A	50	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
STTH3L06U	STMicroelectronics	600	3	1.3 @ 3A	85	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active

Engineering Selection Recommendations

Group A - Direct Current Rating Match (2A @ 600V, Fast Recovery):

MURS160HE3_A/I (Vishay General Semiconductor) is an active component with AEC-Q101 automotive qualification. This part maintains the 600V/2A electrical specification with fast recovery characteristics. Forward voltage is specified at 1A rather than 2A, and reverse recovery time is 75 ns versus the original 50 ns. ROHS3 compliant.

MURS260-E3/5BT (Vishay General Semiconductor) is an active component with 600V/2A rating and fast recovery speed. Forward voltage is 1.45V @ 2A, representing a 0.2V increase from the CEFB205-G specification. Reverse recovery time is 75 ns. ROHS3 compliant. This part is manufacturer-recommended.

STTH2L06U (STMicroelectronics) is an active component with 600V/2A rating and fast recovery characteristics. Forward voltage is 1.3V @ 2A with 85 ns reverse recovery time. ROHS3 compliant.

STTH2R06U (STMicroelectronics) is an active component with 600V/2A rating and fast recovery speed. Forward voltage is 1.7V @ 2A with 50 ns reverse recovery time, matching the original trr specification. Operating temperature range extends to -40°C. ROHS3 compliant.

Group B - Reduced Current Rating (1A @ 600V, Fast Recovery):

MURS160T3G (onsemi) is an active component with 600V/1A rating and fast recovery characteristics. This part is suitable for applications where circuit current does not exceed 1A. Reverse recovery time is 75 ns. ROHS3 compliant. High inventory availability (505,300 pieces).

STTH1L06U (STMicroelectronics) is an active component with 600V/1A rating and fast recovery speed. Forward voltage is 1.3V @ 1A with 80 ns reverse recovery time. ROHS3 compliant.

STTH1R06U (STMicroelectronics) is an active component with 600V/1A rating and fast recovery characteristics. Forward voltage is 1.7V @ 1A with 45 ns reverse recovery time. ROHS3 compliant. High inventory availability (81,530 pieces).

Group C - Increased Current Rating (3A @ 600V):

S3JB (HY Electronic) is an active component with 600V/3A rating and AEC-Q101 automotive qualification. This part provides increased current capacity with standard recovery characteristics. Forward voltage is 1.1V @ 3A. ROHS3 compliant.

STTH3L06U (STMicroelectronics) is an active component with 600V/3A rating and fast recovery speed. Forward voltage is 1.3V @ 3A with 85 ns reverse recovery time. ROHS3 compliant.

Group D - Standard Recovery Alternative (2A @ 600V, Standard Recovery):

S2J (Nexperia USA Inc.) is an active component with 600V/2A rating and standard recovery characteristics (2 µs reverse recovery time). Forward voltage is 1.15V @ 2A. This part is suitable for applications where fast recovery is not required. Extremely high inventory availability (2,447,738 pieces).

Frequently Asked Questions (FAQ)

Q1: Can STTH2R06U directly replace CEFB205-G in all applications?

STTH2R06U maintains identical voltage (600V) and current (2A) ratings with matching 50 ns reverse recovery time. Both are fast recovery diodes in DO-214AA (SMB) packages. Electrical compatibility is established. Verify circuit-specific requirements for forward voltage tolerance (1.7V @ 2A versus 1.25V @ 2A) and operating temperature range (-40°C to 175°C versus 150°C maximum).

Q2: What is the difference between fast recovery and standard recovery diodes?

Fast recovery diodes have reverse recovery time ≤ 500ns and are suitable for high-frequency switching applications. Standard recovery diodes have reverse recovery time >500ns and are suitable for lower-frequency applications. The CEFB205-G is fast recovery (50 ns). S2J is standard recovery (2000 ns). Application switching frequency determines which classification is appropriate.

Q3: Can I use a 1A rated diode instead of the 2A CEFB205-G?

Parts such as MURS160T3G, STTH1L06U, and STTH1R06U are rated for 1A. These are suitable only if circuit current demand does not exceed 1A. Operating the diode above its rated current causes excessive heat generation and reduced component life. Verify actual circuit current requirements before selecting a reduced-current substitute.

Q4: What does AEC-Q101 qualification mean?

AEC-Q101 is an automotive qualification standard for discrete semiconductors. MURS160HE3_A/I and S3JB carry this qualification, indicating compliance with automotive reliability and quality requirements. This qualification is not required for all applications but is mandatory for automotive use.

Q5: Are all substitute parts ROHS3 compliant?

All active substitute parts listed are ROHS3 compliant except S3JB, which has undefined REACH status. ROHS3 compliance indicates the part does not contain restricted substances (lead, cadmium, hexavalent chromium, etc.). Verify compliance requirements for your specific application and regulatory jurisdiction.

Q6: Why does forward voltage vary between substitute parts?

Forward voltage (Vf) varies based on semiconductor material properties, doping levels, and junction design. CEFB205-G specifies 1.25V @ 2A. Substitutes range from 1.1V (S3JB) to 1.7V (STTH1R06U and STTH2R06U). Higher forward voltage increases power dissipation. Verify that circuit design accommodates the forward voltage of the selected substitute.

Q7: What is reverse recovery time and why does it matter?

Reverse recovery time (trr) is the interval required for a forward-biased diode to stop conducting when reverse bias is applied. CEFB205-G specifies 50 ns. Shorter trr reduces switching losses in high-frequency applications. S2J has 2000 ns trr (standard recovery), making it unsuitable for fast-switching circuits but acceptable for low-frequency rectification.

Q8: Can I use MURS260-E3/5BT if forward voltage is higher?

MURS260-E3/5BT specifies 1.45V @ 2A versus CEFB205-G at 1.25V @ 2A. The 0.2V difference increases power dissipation by approximately 10% at 2A. This is acceptable if circuit thermal design accommodates the additional heat. Verify power supply regulation and thermal management before substitution.

Q9: What is the significance of operating temperature range differences?

CEFB205-G maximum junction temperature is 150°C. Most active substitutes extend to 175°C. STTH2R06U extends to -40°C minimum. Wider temperature ranges provide design flexibility for extreme environment applications. Verify that your application temperature requirements fall within the selected part's operating range.

Q10: Why is S2J available in such high quantity?

S2J (Nexperia) shows 2,447,738 pieces in stock. High inventory typically indicates widespread industry adoption and long-term production commitment. Standard recovery characteristics make S2J suitable for general-purpose rectification across many applications. High availability reduces procurement risk for high-volume designs.

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