CSFA101-G Equivalent & Substitute Parts

Part Overview

The CSFA101-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 50 V DC reverse voltage and 1 A average rectified current in a surface mount DO-214AC (SMA) package. This component is classified as obsolete, indicating that the original manufacturer has discontinued production. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode specification.

Key Parameters

Parameter	CSFA101-G Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	mV
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 50 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction (Max)	150	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CSFA101-G is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 1 A
Mounting Type: Must be Surface Mount
Package / Case: Must be DO-214AC (SMA) or mechanically compatible variant (DO-214BA)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) preferred for performance equivalence

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Should not significantly exceed 950 mV @ 1 A to maintain circuit performance
Reverse Recovery Time (trr): Lower values indicate superior switching performance
Current - Reverse Leakage @ Vr: Lower values indicate superior reverse blocking characteristics
Operating Temperature - Junction: Must support application thermal requirements
Moisture Sensitivity Level (MSL): Level 1 (Unlimited) ensures handling compatibility

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (50 V, 1 A, Fast Recovery): Parts meeting all primary criteria with fast recovery characteristics matching the original specification.

Category B - Functional Equivalents (50 V, 1 A, Standard Recovery): Parts meeting voltage and current requirements but with standard recovery characteristics, suitable for applications where switching speed is not critical.

Category C - Higher Voltage Alternatives: Parts exceeding the 50 V rating, applicable only when circuit design permits higher voltage tolerance.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	Speed	trr [ns]	Package	Product Status
CSFA101-G	Comchip Technology	50	1	950	Fast Recovery ≤ 500ns	35	DO-214AC (SMA)	Obsolete
EGF1A	Fairchild Semiconductor	50	1	1000	Fast Recovery ≤ 500ns	50	DO-214AC (SMA)	Active
EGF1A-E3/67A	Vishay General Semiconductor - Diodes Division	50	1	1000	Fast Recovery ≤ 500ns	50	DO-214BA (GF1)	Active
ES1A	YAGEO	50	1	950	Fast Recovery ≤ 500ns	—	DO-214AC (SMA)	Active
ES1A-13-F	Diodes Incorporated	50	1	920	Fast Recovery ≤ 500ns	25	DO-214AC (SMA)	Active
ES1A-E3/5AT	Vishay General Semiconductor - Diodes Division	50	1	920	Fast Recovery ≤ 500ns	25	DO-214AC (SMA)	Active
GF1A	onsemi	50	1	1000	Standard Recovery >500ns	2000	DO-214AC (SMA)	Not For New Designs
GF1A-E3/67A	Vishay General Semiconductor - Diodes Division	50	1	1100	Standard Recovery >500ns	2000	DO-214BA (GF1)	Active
GS1A-LTP	Micro Commercial Co	50	1	1000	Standard Recovery >500ns	—	DO-214AC (SMA)	Not For New Designs
RGF1A	Fairchild Semiconductor	50	1	1300	Fast Recovery ≤ 500ns	150	DO-214AC (SMA)	Active
STTH102A	STMicroelectronics	200	1	970	Fast Recovery ≤ 500ns	20	DO-214AC (SMA)	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalents (Active Status):

For applications requiring direct replacement of the CSFA101-G with minimal circuit redesign, the following parts are recommended based on active product status and electrical equivalence:

ES1A-13-F (Diodes Incorporated): Meets all primary electrical criteria with fast recovery characteristics (trr = 25 ns), lower forward voltage (920 mV @ 1 A), and active product status. RoHS3 compliant. Suitable for new designs.
ES1A-E3/5AT (Vishay General Semiconductor - Diodes Division): Meets all primary electrical criteria with fast recovery characteristics (trr = 25 ns), lower forward voltage (920 mV @ 1 A), and active product status. RoHS3 compliant. Suitable for new designs.
EGF1A (Fairchild Semiconductor): Meets all primary electrical criteria with fast recovery characteristics (trr = 50 ns) and active product status. Forward voltage slightly elevated (1000 mV @ 1 A). Suitable for new designs.

Secondary Recommendation - Higher Voltage Alternative:

STTH102A (STMicroelectronics): Provides 200 V reverse voltage rating with 1 A current capacity in DO-214AC (SMA) package. Fast recovery characteristics (trr = 20 ns) and active product status. Applicable when circuit design permits higher voltage tolerance. RoHS3 compliant.

Not Recommended for New Designs:

GF1A (onsemi): Marked "Not For New Designs" despite active inventory. Standard recovery characteristics (trr = 2 µs) represent significant performance degradation compared to CSFA101-G fast recovery specification.
GS1A-LTP (Micro Commercial Co): Marked "Not For New Designs." Standard recovery characteristics (trr not specified) and higher reverse leakage (10 µA @ 50 V) indicate inferior performance.

Package Variant Consideration:

EGF1A-E3/67A and GF1A-E3/67A (Vishay General Semiconductor - Diodes Division): Both utilize DO-214BA (GF1) package instead of DO-214AC (SMA). Mechanical compatibility must be verified with PCB footprint design before selection. EGF1A-E3/67A maintains fast recovery characteristics; GF1A-E3/67A exhibits standard recovery characteristics.

Frequently Asked Questions (FAQ)

Q: Can STTH102A be used as a direct replacement for CSFA101-G?

A: STTH102A is electrically compatible in terms of current rating (1 A) and package (DO-214AC/SMA), but provides 200 V reverse voltage rating versus the 50 V specification of CSFA101-G. This part is suitable only if the circuit design permits operation at higher voltage ratings. The superior reverse recovery time (20 ns) provides performance benefits in switching applications.

Q: What is the difference between DO-214AC and DO-214BA packages?

A: Both are surface mount diode packages with identical electrical performance characteristics. DO-214AC (SMA) and DO-214BA (GF1) differ in physical dimensions and PCB footprint geometry. Substitution between these packages requires verification that the PCB layout accommodates the alternative footprint. Consult component datasheets for precise dimensional specifications.

Q: Why are GF1A and GS1A-LTP marked "Not For New Designs"?

A: These parts are classified as "Not For New Designs" by their respective manufacturers, indicating that while inventory exists and parts remain available, manufacturers recommend against incorporating them into new circuit designs. This classification typically reflects product maturity, planned obsolescence, or availability of superior alternatives. ES1A-13-F and ES1A-E3/5AT are preferred alternatives for new designs.

Q: What is the significance of reverse recovery time (trr) in diode selection?

A: Reverse recovery time indicates the duration required for a diode to transition from forward conduction to reverse blocking state. Lower trr values (fast recovery) enable faster switching transitions, reducing switching losses and enabling higher frequency operation. The CSFA101-G specifies 35 ns. Substitutes with lower trr values (ES1A-13-F at 25 ns, STTH102A at 20 ns) provide performance improvement; substitutes with higher trr values (GF1A at 2000 ns) represent significant performance degradation.

Q: Are all substitute parts RoHS3 compliant?

A: All recommended substitute parts (ES1A-13-F, ES1A-E3/5AT, EGF1A, EGF1A-E3/67A, STTH102A) are confirmed RoHS3 compliant. This compliance status ensures compatibility with environmental regulations and procurement requirements for restricted substance management.

Q: What is Moisture Sensitivity Level (MSL) and why is it important?

A: MSL indicates the maximum time a component can be exposed to ambient moisture before soldering without risk of delamination or internal corrosion. MSL 1 (Unlimited) represents the least restrictive classification, indicating no moisture sensitivity constraints. The CSFA101-G and all recommended substitutes carry MSL 1 rating, ensuring equivalent handling and storage requirements.

Q: Can forward voltage differences between substitutes affect circuit performance?

A: Forward voltage differences can affect circuit performance in precision applications. The CSFA101-G specifies 950 mV @ 1 A. Substitutes range from 920 mV (ES1A-13-F, ES1A-E3/5AT) to 1300 mV (RGF1A). In rectification applications, lower forward voltage reduces power dissipation and heat generation. In protection circuits, forward voltage differences may require circuit validation to ensure adequate performance margins.

Q: What is the REACH status and why is it listed?

A: REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) is a European Union regulation governing chemical safety. All listed parts carry "REACH Unaffected" status, indicating they do not contain substances of very high concern (SVHC) requiring special authorization. This status ensures regulatory compliance for applications subject to REACH requirements.

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