CSFB203-G Equivalent & Substitute Parts Reference

Part Overview

The CSFB203-G is a general-purpose 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 component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified when design requirements necessitate alternative sourcing, inventory availability, or specific performance characteristics within the allowed electrical and mechanical parameter ranges for this diode category.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	920 mV @ 2 A	mV
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the CSFB203-G are grouped based on strict electrical and mechanical compatibility within the following criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 200 V (exact match required)
Current - Average Rectified (Io): 2 A (exact match required for direct substitution)
Package / Case: DO-214AA, SMB (exact match required)
Mounting Type: Surface Mount (exact match required)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) (preferred for performance consistency)
RoHS Status: ROHS3 Compliant (compliance requirement)

Grouping Logic:

Group 1 - Direct Equivalents (200 V, 2 A, Fast Recovery): Parts meeting all primary criteria with identical voltage, current, and fast recovery characteristics. These include ES2D-13-F (Diodes Incorporated), MURS120-E3/5BT (Vishay), MURS220T3G (onsemi), and STTH2R02U (STMicroelectronics).

Group 2 - Functional Equivalents (200 V, 2 A, Standard Recovery): Parts meeting voltage and current requirements but with standard recovery speed characteristics. S2D (Diotec Semiconductor) falls into this category with slower reverse recovery time (1.5 µs vs. 35 ns).

Group 3 - Current-Reduced Alternatives (200 V, 1.5 A, Fast Recovery): STTH1R02U (STMicroelectronics) provides 200 V reverse voltage with reduced current rating of 1.5 A. This part is suitable only when circuit design permits lower current capacity.

Group 4 - Current-Enhanced Alternatives (200 V, 4 A, Fast Recovery): STTH4R02U and STTH4R02UY (STMicroelectronics) provide 200 V reverse voltage with increased current rating of 4 A. These parts are suitable for applications requiring higher current capacity within the same voltage class.

Group 5 - Inventory-Optimized Alternatives (200 V, 2 A, Fast Recovery): ES2D (Good-Ark Semiconductor) meets all primary criteria and offers high inventory availability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Speed	trr [ns]	Ir @ Vr [µA]	Package	Tj (Max) [°C]	RoHS
CSFB203-G	Comchip Technology	200	2	920 @ 2 A	Fast Recovery ≤ 500ns	35	5 @ 200 V	DO-214AA (SMB)	150	ROHS3
ES2D	Good-Ark Semiconductor	200	2	950 @ 2 A	Fast Recovery ≤ 500ns	35	10 @ 200 V	DO-214AA (SMB)	150	ROHS3
ES2D-13-F	Diodes Incorporated	200	2	920 @ 2 A	Fast Recovery ≤ 500ns	25	5 @ 200 V	DO-214AA (SMB)	150	ROHS3
MURS120-E3/5BT	Vishay General Semiconductor	200	2	875 @ 1 A	Fast Recovery ≤ 500ns	35	2 @ 200 V	DO-214AA (SMB)	175	ROHS3
MURS220T3G	onsemi	200	2	950 @ 2 A	Fast Recovery ≤ 500ns	35	2 @ 200 V	DO-214AA (SMB)	175	ROHS3
S2D	Diotec Semiconductor	200	2	1150 @ 2 A	Standard Recovery >500ns	1500	5 @ 200 V	DO-214AA (SMB)	150	ROHS3
STTH1R02U	STMicroelectronics	200	1.5	1000 @ 1.5 A	Fast Recovery ≤ 500ns	30	3 @ 200 V	DO-214AA (SMB)	175	ROHS3
STTH2R02U	STMicroelectronics	200	2	1000 @ 2 A	Fast Recovery ≤ 500ns	30	3 @ 200 V	DO-214AA (SMB)	175	ROHS3
STTH4R02U	STMicroelectronics	200	4	1050 @ 4 A	Fast Recovery ≤ 500ns	30	3 @ 200 V	DO-214AA (SMB)	175	ROHS3
STTH4R02UY	STMicroelectronics	200	4	1050 @ 4 A	Fast Recovery ≤ 500ns	30	3 @ 200 V	DO-214AA (SMB)	175	ROHS3

Engineering Selection Recommendations

Direct Substitution (Preferred):

ES2D-13-F (Diodes Incorporated) and STTH2R02U (STMicroelectronics) are direct substitutes for CSFB203-G. Both maintain 200 V reverse voltage, 2 A average rectified current, DO-214AA (SMB) package, and fast recovery characteristics. ES2D-13-F provides identical forward voltage (920 mV @ 2 A) and reverse leakage (5 µA @ 200 V) specifications. STTH2R02U offers improved reverse recovery time (30 ns vs. 35 ns) and lower reverse leakage (3 µA @ 200 V). Both are RoHS3 compliant with MSL 1 (Unlimited).

Alternative Substitution (Equivalent Performance):

MURS120-E3/5BT (Vishay) and MURS220T3G (onsemi) are functionally equivalent with identical voltage and current ratings. MURS120-E3/5BT exhibits lower forward voltage (875 mV @ 1 A) and reverse leakage (2 µA @ 200 V). MURS220T3G provides higher operating temperature range (-65°C to 175°C vs. 150°C max). Both maintain fast recovery speed and RoHS3 compliance.

Inventory-Optimized Selection:

ES2D (Good-Ark Semiconductor) meets all primary electrical and mechanical criteria with 89,400 units in stock, providing superior availability compared to CSFB203-G (864 units). Forward voltage specification is 950 mV @ 2 A with reverse leakage of 10 µA @ 200 V, both within acceptable operating margins.

Current-Reduced Alternative:

STTH1R02U (STMicroelectronics) is suitable only when circuit design permits operation at 1.5 A instead of 2 A. This part maintains 200 V reverse voltage, fast recovery characteristics, and RoHS3 compliance with improved reverse recovery time (30 ns).

Current-Enhanced Alternative:

STTH4R02U and STTH4R02UY (STMicroelectronics) are suitable for applications requiring higher current capacity (4 A) within the same 200 V voltage class. STTH4R02UY includes automotive-grade qualification and extended operating temperature range (-40°C to 175°C).

Non-Preferred Alternative:

S2D (Diotec Semiconductor) meets voltage and current requirements but operates with standard recovery speed (>500ns, 1.5 µs trr) rather than fast recovery. This part is suitable only for applications where recovery speed is not performance-critical.

Frequently Asked Questions (FAQ)

Q1: Can I use STTH2R02U as a direct replacement for CSFB203-G?

A: Yes. STTH2R02U maintains identical voltage (200 V), current (2 A), and package (DO-214AA/SMB) specifications. It provides improved reverse recovery time (30 ns vs. 35 ns) and lower reverse leakage (3 µA vs. 5 µA). Both are RoHS3 compliant with MSL 1 (Unlimited).

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

A: Fast recovery diodes have reverse recovery time ≤ 500 ns and are suitable for high-frequency switching applications. Standard recovery diodes have reverse recovery time > 500 ns (S2D: 1.5 µs) and are suitable for lower-frequency or non-switching applications. CSFB203-G is classified as fast recovery.

Q3: Can I substitute STTH1R02U (1.5 A) for CSFB203-G (2 A)?

A: STTH1R02U is a current-reduced alternative suitable only if your circuit design permits operation at 1.5 A maximum. It maintains 200 V reverse voltage, fast recovery characteristics, and RoHS3 compliance. Verify circuit current requirements before selection.

Q4: What is the advantage of STTH4R02U over CSFB203-G?

A: STTH4R02U provides higher current capacity (4 A vs. 2 A) within the same 200 V voltage class and DO-214AA (SMB) package. It is suitable for applications requiring higher current handling. Both maintain fast recovery characteristics and RoHS3 compliance.

Q5: Why does ES2D have higher inventory than CSFB203-G?

A: ES2D (Good-Ark Semiconductor) shows 89,400 units in stock compared to CSFB203-G (864 units). This reflects supplier inventory levels and market availability. ES2D meets all primary electrical and mechanical criteria for substitution.

Q6: What does RoHS3 compliance mean for this diode?

A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed substitute parts are RoHS3 compliant.

Q7: Can I use S2D as a substitute for CSFB203-G?

A: S2D meets 200 V reverse voltage and 2 A current requirements in a DO-214AA (SMB) package. However, it operates with standard recovery speed (1.5 µs trr) rather than fast recovery (35 ns). Use S2D only in applications where recovery speed is not performance-critical.

Q8: What is the difference between STTH4R02U and STTH4R02UY?

A: Both parts provide 200 V, 4 A ratings in DO-214AA (SMB) packages with identical electrical specifications. STTH4R02UY includes automotive-grade qualification (Series Q) and extended operating temperature range (-40°C to 175°C vs. 175°C max for STTH4R02U).

Q9: Does forward voltage (Vf) variation affect substitution?

A: Forward voltage variations within the specified ranges (CSFB203-G: 920 mV @ 2 A; alternatives: 875–1150 mV) are acceptable for most applications. Verify circuit design tolerances for voltage drop-sensitive applications before final selection.

Q10: Are all substitute parts available in the same packaging options?

A: All listed substitute parts are available in surface mount DO-214AA (SMB) packages. Packaging options (Tape & Reel vs. Cut Tape & Digi-Reel) vary by manufacturer and supplier. Verify packaging requirements with your procurement source.

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