CEFB203-G Equivalent & Substitute Parts

Part Overview

The CEFB203-G is a superfast recovery rectifier diode manufactured by Comchip Technology, rated for 200 V DC reverse voltage and 2 A average rectified current in a surface mount DO-214AA (SMB) package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The CEFB203-G features a 25 ns reverse recovery time and 875 mV forward voltage drop at 2 A, positioning it in the superfast recovery category for general-purpose rectification applications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	875 mV @ 2 A	mV
Reverse Recovery Time (trr)	25	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CEFB203-G is determined by the following critical parameters:

Primary Matching Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 2 A minimum
Package / Case: DO-214AA (SMB) surface mount
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Reverse Recovery Time (trr): ≤ 35 ns preferred for performance equivalence
Voltage - Forward (Vf) (Max) @ If: ≤ 1.0 V @ 2 A for thermal performance
Current - Reverse Leakage @ Vr: ≤ 10 µA @ 200 V
RoHS3 Compliance and MSL 1 rating

Substitute parts are grouped into two categories:

Category A - Full Electrical Equivalents (2 A rated current): Parts meeting all primary criteria with 2 A current rating and fast recovery characteristics. These include ER2D-LTP, ES2D, ES2D-13-F, STTH2R02U, STTH2R02UY, and S2D.

Category B - Partial Equivalents (Reduced or Increased Current Rating): Parts meeting voltage, package, and speed requirements but with different current ratings. MURS120T3G (1 A) and STTH1R02U (1.5 A) provide lower current capacity. STTH4R02U and STTH4R02UY (4 A) provide higher current capacity for applications requiring additional margin.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	trr [ns]	Ir @ Vr [µA]	Speed	Package	Status
CEFB203-G	Comchip Technology	200	2	875 @ 2A	25	5 @ 200V	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Obsolete
ER2D-LTP	Micro Commercial Co	200	2	950 @ 2A	35	5 @ 200V	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
ES2D	Good-Ark Semiconductor	200	2	950 @ 2A	35	10 @ 200V	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
ES2D-13-F	Diodes Incorporated	200	2	920 @ 2A	25	5 @ 200V	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
MURS120T3G	onsemi	200	1	875 @ 1A	35	2 @ 200V	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
S2D	Diotec Semiconductor	200	2	1150 @ 2A	1500	5 @ 200V	Standard Recovery >500ns	DO-214AA (SMB)	Active
STTH1R02U	STMicroelectronics	200	1.5	1000 @ 1.5A	30	3 @ 200V	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
STTH2R02U	STMicroelectronics	200	2	1000 @ 2A	30	3 @ 200V	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
STTH2R02UY	STMicroelectronics	200	2	1000 @ 2A	30	3 @ 200V	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
STTH4R02U	STMicroelectronics	200	4	1050 @ 4A	30	3 @ 200V	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active
STTH4R02UY	STMicroelectronics	200	4	1050 @ 4A	30	3 @ 200V	Fast Recovery ≤ 500ns	DO-214AA (SMB)	Active

Engineering Selection Recommendations

Primary Substitutes for Direct Replacement (2 A Rated Current):

ES2D-13-F (Diodes Incorporated) provides the closest electrical match to CEFB203-G with identical 25 ns reverse recovery time, 200 V voltage rating, 2 A current capacity, and 920 mV forward voltage at 2 A. This part is active in production with full RoHS3 compliance and MSL 1 rating. Packaging is available in Cut Tape (CT) & Digi-Reel® format.

STTH2R02U and STTH2R02UY (STMicroelectronics) both meet the 200 V, 2 A specifications with 30 ns reverse recovery time and 1.0 V forward voltage at 2 A. STTH2R02UY includes automotive-grade qualification (Series Q) and is available in higher inventory quantities (60,300 pcs). Both are RoHS3 compliant with MSL 1 rating.

ER2D-LTP (Micro Commercial Co) satisfies all primary electrical requirements with 200 V, 2 A, fast recovery characteristics, and 35 ns reverse recovery time. Forward voltage is 950 mV at 2 A. This part is active with extensive inventory availability (198,400 pcs).

Secondary Substitutes (Current Rating Variations):

STTH1R02U (STMicroelectronics) is suitable for applications where 1.5 A current capacity is sufficient. It maintains 200 V voltage rating, fast recovery speed (30 ns trr), and provides lower reverse leakage (3 µA @ 200 V). Operating temperature range extends to 175°C maximum.

STTH4R02U and STTH4R02UY (STMicroelectronics) provide 4 A current capacity for designs requiring additional current margin within the same 200 V voltage class and DO-214AA package. STTH4R02UY includes automotive qualification. Both feature 30 ns reverse recovery time and 1.05 V forward voltage at 4 A.

MURS120T3G (onsemi) is a 1 A rated alternative with 200 V voltage rating and 35 ns reverse recovery time. This part is suitable only for applications with reduced current requirements.

Not Recommended for Direct Substitution:

S2D (Diotec Semiconductor) does not meet the fast recovery speed requirement. With 1.5 µs reverse recovery time (standard recovery classification), this part is unsuitable for applications requiring the superfast recovery characteristics of CEFB203-G.

Compliance and Availability:

All recommended active substitutes maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental qualification of the original part. All substitute parts are classified as active in production status, ensuring long-term availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can STTH2R02UY directly replace CEFB203-G in existing designs?

A: Yes. STTH2R02UY meets all primary electrical specifications: 200 V reverse voltage, 2 A average rectified current, DO-214AA (SMB) surface mount package, and fast recovery speed classification. The 30 ns reverse recovery time is within acceptable tolerance of the original 25 ns specification. Forward voltage is 1.0 V at 2 A compared to 875 mV in the original part, resulting in approximately 12.5% higher power dissipation per device. Automotive-grade qualification (Series Q) provides additional reliability assurance.

Q: What is the difference between ES2D-13-F and ER2D-LTP?

A: Both parts meet the 200 V, 2 A core specifications and fast recovery classification. ES2D-13-F (Diodes Incorporated) features 25 ns reverse recovery time and 920 mV forward voltage at 2 A, matching the original CEFB203-G more closely. ER2D-LTP (Micro Commercial Co) has 35 ns reverse recovery time and 950 mV forward voltage at 2 A. ES2D-13-F is preferred for applications sensitive to switching speed and thermal performance. ER2D-LTP offers higher inventory availability (198,400 pcs vs. 130,906 pcs).

Q: Why is S2D listed as a substitute if it has standard recovery characteristics?

A: S2D is included in the provided substitute list but is not recommended for direct replacement. The part features 1.5 µs reverse recovery time (standard recovery classification), which does not meet the fast recovery requirement (≤ 500 ns) of CEFB203-G. Applications requiring superfast recovery performance should not use S2D.

Q: Can STTH4R02UY be used in place of CEFB203-G?

A: STTH4R02UY is electrically compatible with CEFB203-G for voltage (200 V) and package (DO-214AA/SMB) specifications. The 4 A current rating exceeds the 2 A requirement, providing additional design margin. Reverse recovery time (30 ns) and forward voltage (1.05 V @ 4 A) are within acceptable ranges. This substitution is suitable for applications where higher current capacity provides system-level benefits. Thermal design must account for the slightly higher forward voltage drop.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in two primary packaging formats: Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel®. ER2D-LTP, S2D, and STTH1R02U are supplied in Tape & Reel format. ES2D, ES2D-13-F, MURS120T3G, STTH2R02U, STTH4R02U, and STTH4R02UY are available in Cut Tape & Digi-Reel® format. STTH2R02UY packaging format is not specified in available data. Verify packaging requirements with your procurement specification before finalizing part selection.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts carry RoHS3 compliance certification. CEFB203-G is also RoHS3 compliant. All parts maintain MSL 1 (Unlimited) moisture sensitivity level, indicating no special moisture control requirements during storage and handling.

Q: What is the temperature operating range difference between CEFB203-G and substitute parts?

A: CEFB203-G specifies a maximum junction temperature of 150°C. Substitute parts vary: ER2D-LTP operates from -65°C to 175°C; ES2D from -55°C to 150°C; ES2D-13-F from -55°C to 150°C; MURS120T3G from -65°C to 175°C; STTH1R02U, STTH2R02U, STTH2R02UY, STTH4R02U, and STTH4R02UY all specify 175°C maximum. Most active substitutes provide extended upper temperature capability, offering improved thermal margin for high-temperature applications.

Q: Should I select STTH2R02U or STTH2R02UY?

A: Both parts are electrically identical with 200 V, 2 A, 30 ns reverse recovery time, and 1.0 V forward voltage at 2 A. STTH2R02UY includes automotive-grade qualification (Series Q) and specifies operating temperature range of -40°C to 175°C. STTH2R02U does not specify a minimum temperature. Select STTH2R02UY for automotive applications or designs requiring formal automotive qualification. STTH2R02U is suitable for general industrial and consumer applications. STTH2R02UY has higher inventory availability (109,754 pcs vs. 43,020 pcs for STTH2R02U).

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