CSFM104-G Equivalent & Substitute Parts Reference

Part Overview

The CSFM104-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 400 V DC reverse voltage and 1 A average rectified current in a surface mount Mini SMA/SOD-123 package. This part is classified as obsolete, which necessitates identification of active equivalent and substitute components for new designs and ongoing production support. Equivalent parts must maintain electrical performance within the specified parameters while accommodating available packaging options and manufacturer availability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	400	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.25	V @ 1 A
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 400 V
Capacitance @ Vr, F	10	pF @ 4V, 1MHz
Mounting Type	Surface Mount	—
Package / Case	SOD-123T	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CSFM104-G is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 400 V minimum
Current - Average Rectified (Io): 1 A minimum
Voltage - Forward (Vf) (Max) @ If: ≤ 1.25 V @ 1 A
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Considerations:

Package / Case compatibility: SOD-123T (original), SOD-123F, or DO-214AC (SMA) acceptable
Reverse Recovery Time (trr): ≤ 500 ns for fast recovery variants; standard recovery acceptable
Current - Reverse Leakage @ Vr: ≤ 10 µA @ 400 V
Operating Temperature Range: -55°C minimum to 150°C minimum

Substitute parts are grouped into two categories: Active Status parts suitable for new designs, and Not For New Designs parts available for legacy system support and replacement inventory.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ 1A (V)	trr (ns)	Ir @ 400V (µA)	Package	Status
CSFM104-G	Comchip Technology	400	1	1.25	35	5	SOD-123T	Obsolete
ES1GWF-HF	Comchip Technology	400	1	1.25	35	5	SOD-123F	Active
ES1G-LTP	Micro Commercial Co	400	1	1.25	35	5	DO-214AC (SMA)	Active
GS1G-LTP	Micro Commercial Co	400	1	1.0	>500	10	DO-214AC (SMA)	Not For New Designs
GS1GE-TP	Micro Commercial Co	400	1	1.1	>500	5	DO-214AC (SMA)	Not For New Designs
MRA4004T3G	onsemi	400	1	1.1	>500	10	DO-214AC (SMA)	Not For New Designs
NRVA4004T3G	onsemi	400	1	1.1	>500	10	DO-214AC (SMA)	Not For New Designs
RS1G-E3/5AT	Vishay General Semiconductor	400	1	1.3	150	5	DO-214AC (SMA)	Active
RS1G-E3/61T	Vishay General Semiconductor	400	1	1.3	150	5	DO-214AC (SMA)	Active
RS1GHE3_A/I	Vishay General Semiconductor	400	1	1.3	150	5	DO-214AC (SMA)	Active
S1G-E3/5AT	Vishay General Semiconductor	400	1	1.1	1800	1	DO-214AC (SMA)	Active

Engineering Selection Recommendations

For New Designs:

Select from parts with Active product status:

ES1GWF-HF (Comchip Technology): Maintains original manufacturer continuity with fast recovery characteristics (trr = 35 ns) and SOD-123F packaging. Forward voltage matches original specification at 1.25 V @ 1 A.
ES1G-LTP (Micro Commercial Co): Fast recovery diode (trr = 35 ns) in DO-214AC (SMA) package with extended operating temperature range (-65°C to 175°C). Forward voltage 1.25 V @ 1 A.
RS1G-E3/5AT, RS1G-E3/61T (Vishay General Semiconductor): Fast recovery devices (trr = 150 ns) in DO-214AC (SMA) package. Forward voltage 1.3 V @ 1 A. Available in Tape & Reel packaging.
RS1GHE3_A/I (Vishay General Semiconductor): Automotive-qualified variant (AEC-Q101) with fast recovery characteristics. Suitable for automotive applications requiring qualification documentation.
S1G-E3/5AT (Vishay General Semiconductor): Standard recovery diode with lowest reverse leakage (1 µA @ 400 V) and highest inventory availability (1,000,100 pcs). Forward voltage 1.1 V @ 1 A.

For Legacy System Support:

Parts classified as "Not For New Designs" remain electrically compatible and are available in high inventory quantities for replacement and maintenance applications:

GS1G-LTP, GS1GE-TP (Micro Commercial Co): Standard recovery variants with DO-214AC (SMA) packaging.
MRA4004T3G, NRVA4004T3G (onsemi): Standard recovery devices with high inventory (155,400 and 55,300 pcs respectively). NRVA4004T3G includes automotive qualification (AEC-Q101).

Compliance Verification:

All substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and EAR99 export classification consistent with the original CSFM104-G specification.

Frequently Asked Questions (FAQ)

Q: Can ES1GWF-HF directly replace CSFM104-G in existing PCB layouts?

A: ES1GWF-HF uses SOD-123F packaging while CSFM104-G uses SOD-123T. Both are surface mount packages with different footprints. PCB layout modification is required. Electrical parameters are equivalent (400 V, 1 A, 1.25 V forward voltage, 35 ns recovery time).

Q: What is the difference between fast recovery (trr ≤ 500 ns) and standard recovery (trr > 500 ns) variants?

A: Fast recovery diodes (ES1GWF-HF, ES1G-LTP, RS1G variants) exhibit shorter reverse recovery time, reducing switching losses in high-frequency applications. Standard recovery diodes (GS1G-LTP, GS1GE-TP, MRA4004T3G, S1G-E3/5AT) are suitable for line-frequency and low-frequency rectification. Both meet the 400 V / 1 A electrical specification.

Q: Are DO-214AC (SMA) and SOD-123 packages interchangeable?

A: No. DO-214AC (SMA) and SOD-123T/SOD-123F are distinct surface mount packages with different footprints, lead spacing, and PCB pad layouts. Design verification and PCB layout modification are required when switching between package types.

Q: Which substitute part has the lowest forward voltage drop?

A: S1G-E3/5AT exhibits the lowest forward voltage at 1.1 V @ 1 A, compared to 1.25 V for the original CSFM104-G. This reduces power dissipation in rectification circuits. However, S1G-E3/5AT is a standard recovery device (trr = 1.8 µs) suitable for low-frequency applications.

Q: Is automotive qualification available for substitute parts?

A: Yes. RS1GHE3_A/I (Vishay) and NRVA4004T3G (onsemi) are AEC-Q101 qualified for automotive applications. Both maintain 400 V / 1 A ratings and ROHS3 compliance.

Q: What inventory considerations apply to substitute selection?

A: S1G-E3/5AT has the highest inventory (1,000,100 pcs), followed by GS1GE-TP (26,646 pcs) and MRA4004T3G (155,400 pcs). For immediate availability in active status parts, ES1G-LTP (13,565 pcs) and RS1G-E3/61T (24,103 pcs) are recommended.

Q: Can GS1G-LTP or MRA4004T3G be used in new designs?

A: Both parts are classified "Not For New Designs" by their manufacturers. They remain electrically compatible and are suitable for legacy system maintenance, replacement inventory, and retrofit applications. New product designs should select from Active status alternatives.

Q: What is the temperature operating range difference between CSFM104-G and substitutes?

A: CSFM104-G operates -55°C to 150°C. ES1G-LTP extends to -65°C to 175°C. RS1G variants, GS1G variants, and MRA4004T3G operate -55°C to 150°C or -55°C to 175°C. Verify application temperature requirements before selection.

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