CSFM105-G Equivalent & Substitute Parts

Part Overview

The CSFM105-G is a 600 V, 1 A surface mount general-purpose rectifier diode manufactured by Comchip Technology in SOD-123T package. This component is classified as Active and complies with RoHS3 and REACH requirements. The part is suitable for applications requiring fast recovery characteristics with a reverse recovery time of 35 ns and forward voltage of 1.7 V at 1 A.

Equivalent and substitute parts are necessary when the original CSFM105-G becomes unavailable, when alternative packaging formats are required for manufacturing optimization, or when design flexibility demands components from different manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	600	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	1.7 @ 1	V @ A
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	-
Reverse Recovery Time (trr)	35	ns
Current - Reverse Leakage @ Vr	5	µA @ 600 V
Capacitance @ Vr, F	10	pF @ 4V, 1MHz
Operating Temperature - Junction	-55 to 150	°C
Package / Case	SOD-123T	-
Mounting Type	Surface Mount	-
RoHS Status	ROHS3 Compliant	-

Substitute Part Grouping Explanation

Substitution of the CSFM105-G is determined by strict equivalence in the following electrical parameters:

Primary Equivalence Criteria:

Voltage - DC Reverse (Vr) (Max): 600 V
Current - Average Rectified (Io): 1 A
Mounting Type: Surface Mount
Technology: Standard
RoHS3 Compliance: Required

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: 1.7 V @ 1 A or lower
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io) preferred
Reverse Recovery Time (trr): ≤ 35 ns preferred
Operating Temperature Range: Must encompass -55°C to 150°C minimum
Package compatibility: SOD-123T (Mini SMA) or DO-214AC (SMA) acceptable for surface mount applications

Substitute parts are grouped into two categories based on package type: SOD-123T Mini SMA variants and DO-214AC SMA variants. Both package types are surface mount and electrically compatible when electrical parameters align.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (V @ A)	Speed	trr (ns)	Ir @ Vr (µA @ V)	Package	Temp Range (°C)	Product Status
CSFM105-G	Comchip Technology	600	1	1.7 @ 1	Fast Recovery ≤ 500ns	35	5 @ 600	SOD-123T	-55 to 150	Active
ES1J-LTP	Micro Commercial Co	600	1	1.7 @ 1	Fast Recovery ≤ 500ns	35	5 @ 600	DO-214AC (SMA)	-65 to 175	Active
GS1J-LTP	Micro Commercial Co	600	1	1.0 @ 1	Standard Recovery >500ns	-	10 @ 600	DO-214AC (SMA)	-55 to 150	Active
MRA4005T1G	onsemi	600	1	1.1 @ 1	Standard Recovery >500ns	-	10 @ 600	DO-214AC (SMA)	-55 to 175	Not For New Designs
MRA4005T3G	onsemi	600	1	1.1 @ 1	Standard Recovery >500ns	-	10 @ 600	DO-214AC (SMA)	-55 to 175	Not For New Designs
RS1J-E3/5AT	Vishay General Semiconductor - Diodes Division	600	1	1.3 @ 1	Fast Recovery ≤ 500ns	250	5 @ 600	DO-214AC (SMA)	-55 to 150	Active
RS1J-E3/61T	Vishay General Semiconductor - Diodes Division	600	1	1.3 @ 1	Fast Recovery ≤ 500ns	250	5 @ 600	DO-214AC (SMA)	-55 to 150	Active
S1J-E3/5AT	Vishay General Semiconductor - Diodes Division	600	1	1.1 @ 1	Standard Recovery >500ns	1800	1 @ 600	DO-214AC (SMA)	-55 to 150	Active
S1J-E3/61T	Vishay General Semiconductor - Diodes Division	600	1	1.1 @ 1	Standard Recovery >500ns	1800	1 @ 600	DO-214AC (SMA)	-55 to 150	Active
US1J-E3/5AT	Vishay General Semiconductor - Diodes Division	600	1	1.7 @ 1	Fast Recovery ≤ 500ns	75	10 @ 600	DO-214AC (SMA)	-55 to 150	Active
US1J-E3/61T	Vishay General Semiconductor - Diodes Division	600	1	1.7 @ 1	Fast Recovery ≤ 500ns	75	10 @ 600	DO-214AC (SMA)	-55 to 150	Active

Engineering Selection Recommendations

Primary Substitute (Closest Electrical Match): ES1J-LTP from Micro Commercial Co is the primary recommended substitute. It matches the CSFM105-G in all critical electrical parameters: 600 V reverse voltage, 1 A average rectified current, 1.7 V forward voltage at 1 A, fast recovery speed classification with 35 ns reverse recovery time, and 5 µA reverse leakage current. The part is Active status and RoHS3 compliant. The package change from SOD-123T to DO-214AC (SMA) requires PCB layout modification but maintains electrical equivalence.

Secondary Substitutes (Active Status, Electrical Compatibility): RS1J-E3/5AT and RS1J-E3/61T from Vishay General Semiconductor maintain fast recovery characteristics and meet all voltage and current requirements. Forward voltage is 1.3 V at 1 A, which is lower than the CSFM105-G. Reverse recovery time is 250 ns, which exceeds the original 35 ns specification but remains within fast recovery classification. Both parts are Active status and RoHS3 compliant.

US1J-E3/5AT and US1J-E3/61T from Vishay General Semiconductor match the CSFM105-G in forward voltage (1.7 V @ 1 A) and fast recovery classification. Reverse recovery time is 75 ns, which is higher than the original 35 ns. Reverse leakage current is 10 µA, double the original specification. Both parts are Active status and RoHS3 compliant.

Alternative Substitutes (Standard Recovery, Active Status): S1J-E3/5AT and S1J-E3/61T from Vishay General Semiconductor are Active status alternatives with lower forward voltage (1.1 V @ 1 A) and lower reverse leakage (1 µA @ 600 V). However, these parts feature standard recovery characteristics (>500ns) rather than fast recovery, with reverse recovery time of 1800 ns. Selection requires confirmation that application does not require fast recovery performance.

GS1J-LTP from Micro Commercial Co is an Active status alternative with standard recovery characteristics and 1.0 V forward voltage at 1 A. Reverse leakage is 10 µA. Operating temperature range matches the CSFM105-G (-55°C to 150°C).

Not Recommended for New Designs: MRA4005T1G and MRA4005T3G from onsemi are marked "Not For New Designs" and should not be selected for new applications despite electrical compatibility.

Frequently Asked Questions (FAQ)

Q: Can ES1J-LTP directly replace CSFM105-G without circuit modification?

A: ES1J-LTP is electrically equivalent to CSFM105-G in all critical parameters. However, the package changes from SOD-123T (Mini SMA) to DO-214AC (SMA), requiring PCB footprint modification. The physical dimensions differ, so direct board-level substitution without layout changes is not possible.

Q: What is the difference between Fast Recovery and Standard Recovery diodes?

A: Fast Recovery diodes have reverse recovery time ≤ 500 ns and are specified for applications requiring rapid switching. Standard Recovery diodes have reverse recovery time > 500 ns. The CSFM105-G is Fast Recovery with 35 ns trr. Substitutes with Standard Recovery (such as S1J-E3/5AT with 1800 ns trr) are suitable only if the application does not require fast switching performance.

Q: Why do some substitutes have different forward voltage specifications?

A: Forward voltage variation is a normal characteristic of different diode designs and manufacturing processes. The CSFM105-G specifies 1.7 V @ 1 A maximum. Substitutes with lower forward voltage (such as S1J-E3/5AT at 1.1 V) will dissipate less power. Substitutes with equal or higher forward voltage maintain the original thermal characteristics. All listed substitutes remain within acceptable operating parameters for 600 V, 1 A general-purpose rectifier applications.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed are RoHS3 compliant and REACH unaffected, matching the compliance status of the CSFM105-G.

Q: What is the significance of reverse leakage current differences?

A: Reverse leakage current (Ir) represents the small current flowing through the diode in reverse bias condition. The CSFM105-G specifies 5 µA @ 600 V. Substitutes with higher reverse leakage (such as US1J-E3/5AT at 10 µA or GS1J-LTP at 10 µA) will have slightly higher standby power consumption. Substitutes with lower reverse leakage (such as S1J-E3/5AT at 1 µA) will have lower standby power consumption. Selection depends on application power budget requirements.

Q: Can I use MRA4005T1G or MRA4005T3G in new designs?

A: No. Both MRA4005T1G and MRA4005T3G are marked "Not For New Designs" by onsemi. These parts should be used only for legacy product support or repair of existing equipment. New designs must select from Active status alternatives such as ES1J-LTP, RS1J-E3/5AT, US1J-E3/5AT, or S1J-E3/5AT.

Q: What packaging options are available for CSFM105-G substitutes?

A: The original CSFM105-G uses SOD-123T (Mini SMA) package. Substitute parts are available in two package formats: DO-214AC (SMA) and SOD-123T. DO-214AC (SMA) is the most common substitute package and is offered by Micro Commercial Co (ES1J-LTP, GS1J-LTP) and Vishay General Semiconductor (RS1J, S1J, US1J series). Package selection affects PCB layout and must be confirmed during design phase.

Q: How do I select between multiple substitute options?

A: Selection priority should follow this sequence: (1) Confirm application requires Fast Recovery or Standard Recovery characteristics; (2) Match voltage and current ratings (600 V, 1 A); (3) Verify operating temperature range encompasses application requirements; (4) Select Active status parts over "Not For New Designs" parts; (5) Confirm package compatibility with PCB layout; (6) Verify forward voltage and reverse leakage current are acceptable for application power budget; (7) Confirm availability and lead time with supplier.

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