CSFM103-G Equivalent & Substitute Parts Reference

Part Overview

The CSFM103-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 200 V DC reverse voltage and 1 A average rectified current in a Surface Mount Mini SMA/SOD-123 package. This component is classified as obsolete, indicating discontinued production and limited availability. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this rectifier diode.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	950 mV @ 1 A	mV
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 200 V
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Mounting Type	Surface Mount	—
Package / Case	SOD-123T	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the CSFM103-G are selected based on strict electrical and mechanical compatibility criteria. The following parameters determine substitution eligibility:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 200 V (exact match required)
Current - Average Rectified (Io): 1 A (exact match required)
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount
Operating Temperature Range: Minimum -55°C to +150°C

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Substitutes may vary within the range of 900 mV to 1.3 V @ 1 A
Reverse Recovery Time (trr): Substitutes may range from 25 ns to 150 ns
Current - Reverse Leakage @ Vr: Substitutes may range from 1 µA to 5 µA @ 200 V
Package / Case: SOD-123F and DO-214AC (SMA) are mechanically compatible with SOD-123T for surface mount applications

Substitute parts are grouped into two categories: Standard Grade (commercial applications) and Automotive Grade (AEC-Q101 qualified for automotive applications).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ 1A [mV]	trr [ns]	Ir @ 200V [µA]	Package	Status
CSFM103-G	Comchip Technology	200	1	950	35	5	SOD-123T	Obsolete
ES1DWF-HF	Comchip Technology	200	1	1000	35	5	SOD-123F	Active
ES1D-E3/5AT	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ES1D-E3/61T	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ES1D-M3/5AT	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ES1D-M3/61T	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ES1DHE3_A/H	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ES1DHE3_A/I	Vishay General Semiconductor	200	1	920	25	5	DO-214AC (SMA)	Active
ESH1D-E3/61T	Vishay General Semiconductor	200	1	900	25	1	DO-214AC (SMA)	Active
RS1D-E3/5AT	Vishay General Semiconductor	200	1	1300	150	5	DO-214AC (SMA)	Active
RS1D-E3/61T	Vishay General Semiconductor	200	1	1300	150	5	DO-214AC (SMA)	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

The ES1D series from Vishay General Semiconductor (ES1D-E3/5AT, ES1D-E3/61T, ES1D-M3/5AT, ES1D-M3/61T) are the preferred substitutes for the CSFM103-G. These parts maintain identical electrical ratings (200 V, 1 A) with improved performance characteristics: lower forward voltage drop (920 mV vs. 950 mV) and faster reverse recovery time (25 ns vs. 35 ns). All variants are Active status with ROHS3 compliance and unlimited moisture sensitivity rating. The primary difference is packaging format (DO-214AC/SMA vs. SOD-123T) and tape configuration (Cut Tape vs. Digi-Reel). Inventory availability is substantial across all ES1D variants.

Automotive-Grade Alternatives:

The ES1DHE3_A/H and ES1DHE3_A/I variants are AEC-Q101 qualified automotive-grade rectifiers with identical electrical specifications to the standard ES1D series. These are suitable for applications requiring automotive qualification and are available in high inventory quantities (24,800 and 20,200 units respectively).

Enhanced Performance Option:

The ESH1D-E3/61T offers superior reverse leakage characteristics (1 µA vs. 5 µA @ 200 V) and extended operating temperature range (-55°C to +175°C vs. -55°C to +150°C). Forward voltage is slightly lower (900 mV). This variant is appropriate for applications with stringent leakage requirements or elevated temperature environments.

Alternative Technology:

The RS1D series (RS1D-E3/5AT, RS1D-E3/61T) represents a different rectifier technology with higher forward voltage (1.3 V) and slower recovery time (150 ns). These are suitable only if circuit design accommodates the increased forward voltage drop and recovery characteristics.

Comchip Alternative:

The ES1DWF-HF from Comchip Technology maintains manufacturer continuity with forward voltage characteristics closer to the original CSFM103-G (1000 mV vs. 950 mV) and uses SOD-123F packaging. This option is appropriate for designs requiring minimal component change.

Frequently Asked Questions (FAQ)

Q: Can I use ES1D-E3/61T as a direct replacement for CSFM103-G?

A: Yes. The ES1D-E3/61T meets all critical electrical requirements: 200 V reverse voltage, 1 A average rectified current, fast recovery speed classification, and -55°C to +150°C operating range. The primary difference is package format (DO-214AC/SMA vs. SOD-123T). Both are surface mount packages with compatible footprints for standard PCB assembly. Verify PCB layout compatibility before implementation.

Q: What is the difference between ES1D-E3/5AT and ES1D-E3/61T?

A: Both parts have identical electrical specifications. The difference is tape configuration: ES1D-E3/5AT is supplied in Cut Tape (CT) & Digi-Reel format, while ES1D-E3/61T is supplied in standard Tape & Reel (TR) format. Selection depends on assembly equipment compatibility and procurement requirements.

Q: Why do RS1D parts have higher forward voltage than ES1D parts?

A: The RS1D series represents a different rectifier technology with different semiconductor material or junction design, resulting in higher forward voltage (1.3 V vs. 920 mV) and slower recovery time (150 ns vs. 25 ns). RS1D substitution is appropriate only if circuit design accommodates these electrical differences.

Q: Are automotive-grade parts (ES1DHE3_A/H, ES1DHE3_A/I) compatible with commercial applications?

A: Yes. Automotive-grade parts with AEC-Q101 qualification exceed commercial-grade requirements and are fully compatible with commercial applications. They provide additional reliability assurance and are appropriate for any application requiring enhanced quality standards.

Q: What is the significance of the ESH1D-E3/61T lower reverse leakage current?

A: The ESH1D-E3/61T exhibits 1 µA reverse leakage at 200 V compared to 5 µA for standard ES1D parts. Lower leakage current reduces power dissipation in reverse bias conditions and is beneficial for precision analog circuits, high-impedance applications, or designs with stringent power consumption requirements.

Q: Can I mix different substitute parts in the same design?

A: All listed substitutes meet the core electrical requirements (200 V, 1 A, fast recovery). However, mixing different part numbers in production introduces supply chain complexity and potential performance variation. Standardize on a single substitute part number for consistency.

Q: What packaging considerations apply when switching from SOD-123T to DO-214AC (SMA)?

A: SOD-123T and DO-214AC (SMA) are both surface mount packages with different physical dimensions. DO-214AC is larger. Verify PCB footprint compatibility, solder reflow profile compatibility, and assembly equipment capability before design transition. Consult package datasheets for precise dimensional specifications.

Q: Is the CSFM103-G truly obsolete, or is it still available?

A: The CSFM103-G is classified as obsolete by the manufacturer, indicating discontinued production. However, 991 units are currently in stock. For long-term supply security and new designs, transition to an active-status substitute part such as ES1D-E3/61T or ES1DWF-HF.

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