M40R105M1-F Equivalent & Substitute Parts

Part Overview

The M40R105M1-F is a 1 µF ±20% 100V ceramic capacitor with X7R temperature coefficient manufactured by Cornell Dubilier Electronics (CDE) in radial through-hole configuration. This part is classified as obsolete, necessitating identification of active equivalent and substitute components for ongoing production and maintenance applications. The part operates across -55°C to 125°C and is ROHS3 compliant with MSL rating of 1 (unlimited moisture sensitivity level).

Key Parameters

Parameter	Value	Substitution Relevance
Capacitance	1 µF	Critical - must match exactly
Voltage Rating	100V	Critical - minimum requirement; higher ratings acceptable
Tolerance	±20%	Critical - tighter tolerances acceptable
Temperature Coefficient	X7R	Critical - must match for temperature stability
Operating Temperature Range	-55°C to 125°C	Critical - minimum requirement
Mounting Type	Through Hole Radial	Critical - determines PCB compatibility
Lead Spacing	0.200" (5.08mm)	Critical - PCB footprint requirement
RoHS Status	ROHS3 Compliant	Regulatory - preferred for new designs

Substitute Part Grouping Explanation

Substitution eligibility is determined by strict adherence to the following parameters:

Critical Matching Parameters:

Capacitance value: 1 µF (exact match required)
Temperature coefficient: X7R (exact match required)
Mounting type: Through Hole Radial (exact match required)
Lead spacing: 0.200" (5.08mm) (exact match required)
Voltage rating: 100V minimum (equal or higher acceptable)
Tolerance: ±20% minimum (equal or tighter acceptable)
Operating temperature range: -55°C to 125°C minimum (equal or wider acceptable)

Acceptable Variations:

Physical dimensions may vary within PCB layout constraints
Lead style (straight vs. formed) acceptable if lead spacing maintained
Packaging format (bulk vs. tape & reel) does not affect electrical compatibility
RoHS compliance status may differ based on application requirements

Parts are grouped into three categories:

Direct Substitutes (Electrical & Mechanical Equivalents): KYOCERA AVX SR401C105MAATR1, SR401C105MAR, and SR751C105MARTR1 meet all critical parameters with active product status.

Upgrade Substitutes (Enhanced Specifications): KEMET ARR06D105MGS, ARR07D105KGS, C330C105KAR5TA, C330C105MAR5TA, C340C105K1R5TA, C340C105KAR5TA, and TDK FK20X7R2A105KN000 provide equal or superior electrical performance with additional features or compliance benefits.

Parameter Comparison

Manufacturer	Part Number	Capacitance	Voltage	Tolerance	Temp Coeff	Temp Range	Mounting	Lead Spacing	Product Status	RoHS
Cornell Dubilier	M40R105M1-F	1 µF	100V	±20%	X7R	-55 to 125°C	Through Hole Radial	0.200"	Obsolete	ROHS3
KYOCERA AVX	SR401C105MAATR1	1 µF	100V	±20%	X7R	-55 to 125°C	Through Hole Radial	0.200"	Active	ROHS3
KYOCERA AVX	SR401C105MAR	1 µF	100V	±20%	X7R	-55 to 125°C	Through Hole Radial	0.200"	Active	ROHS3
KYOCERA AVX	SR751C105MARTR1	1 µF	100V	±20%	X7R	-55 to 125°C	Through Hole Radial	0.200"	Active	ROHS3
KEMET	ARR06D105MGS	1 µF	100V	±20%	X7R	-55 to 200°C	Through Hole Radial	0.200"	Active	Non-compliant
KEMET	ARR07D105KGS	1 µF	100V	±10%	X7R	-55 to 200°C	Through Hole Radial	0.200"	Active	Non-compliant
KEMET	C330C105KAR5TA	1 µF	250V	±10%	X7R	-55 to 125°C	Through Hole Radial	0.200"	Active	ROHS3
KEMET	C330C105MAR5TA	1 µF	250V	±20%	X7R	-55 to 125°C	Through Hole Radial	0.200"	Active	ROHS3
KEMET	C340C105K1R5TA	1 µF	100V	±10%	X7R	-55 to 125°C	Through Hole Radial	0.200"	Active	ROHS3
KEMET	C340C105KAR5TA	1 µF	250V	±10%	X7R	-55 to 125°C	Through Hole Radial	0.200"	Active	ROHS3
TDK Corporation	FK20X7R2A105KN000	1 µF	100V	±10%	X7R	-55 to 125°C	Through Hole Radial	0.197"	Not For New Designs	ROHS3

Engineering Selection Recommendations

For Direct Replacement (Electrical & Mechanical Equivalence):

KYOCERA AVX SR401C105MAATR1, SR401C105MAR, and SR751C105MARTR1 are recommended as primary substitutes. All three parts maintain identical electrical specifications (1 µF ±20% 100V X7R) and critical mechanical parameters (0.200" lead spacing, through-hole radial mounting). All are active products with ROHS3 compliance. Selection between these three depends on packaging requirements: SR401C105MAATR1 and SR751C105MARTR1 are supplied in tape & reel format suitable for automated assembly, while SR401C105MAR is supplied in bulk. Physical dimensions vary slightly; SR401C105MAATR1 and SR401C105MAR feature 0.460" maximum seated height, while SR751C105MARTR1 features 0.480" maximum seated height. Lead style differs: SR401C105MAATR1 and SR401C105MAR have straight leads, while SR751C105MARTR1 has formed leads.

For Enhanced Performance Applications:

KEMET C340C105K1R5TA is recommended when tighter tolerance (±10%) is required while maintaining 100V rating and ROHS3 compliance. This part is active and provides improved capacitance stability.

KEMET ARR07D105KGS is recommended for applications requiring extended operating temperature range (-55°C to 200°C) with tighter tolerance (±10%). This part is active but RoHS non-compliant; use only in applications where RoHS compliance is not mandated.

KEMET C330C105MAR5TA or C340C105KAR5TA are recommended when higher voltage rating (250V) is required for circuit margin or safety considerations. Both are ROHS3 compliant and active products.

Not Recommended for New Designs:

TDK FK20X7R2A105KN000 has product status "Not For New Designs" and should be used only for legacy system maintenance where exact form factor is critical. Lead spacing of 0.197" differs slightly from standard 0.200", requiring verification of PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher voltage rating than the original M40R105M1-F?

A: Yes. The original part is rated 100V. Substitute parts with 250V rating (such as KEMET C330C105KAR5TA or C340C105KAR5TA) are electrically compatible and provide additional voltage margin. Higher voltage rating does not degrade performance in 100V applications. Physical dimensions may differ; verify PCB layout compatibility.

Q: What is the difference between ±20% and ±10% tolerance specifications?

A: Both tolerances are acceptable substitutes for the original ±20% part. The ±10% tolerance (found in ARR07D105KGS, C340C105K1R5TA, C340C105KAR5TA, and FK20X7R2A105KN000) provides tighter capacitance accuracy. This is an upgrade that improves circuit performance without introducing incompatibility.

Q: Are tape & reel packaged parts (MAATR1, MARTR1) compatible with bulk packaged parts (MAR)?

A: Yes, from an electrical and mechanical standpoint. Tape & reel packaging is used for automated assembly lines, while bulk packaging is used for manual assembly or lower-volume applications. The capacitor itself is identical; only the delivery format differs. Verify your assembly process requirements before selecting packaging format.

Q: Why does the TDK FK20X7R2A105KN000 have a different lead spacing (0.197" vs. 0.200")?

A: The 0.003" difference (0.076mm) is within typical PCB manufacturing tolerances but may cause fit issues on legacy boards designed for 0.200" spacing. This part is marked "Not For New Designs" and should be used only for exact replacement in existing systems where physical fit has been verified.

Q: Can I use KEMET ARR06D105MGS or ARR07D105KGS in RoHS-regulated applications?

A: No. Both KEMET ARR series parts are RoHS non-compliant. Use only in applications where RoHS compliance is not required. For RoHS-compliant alternatives, select KYOCERA AVX SR series parts or KEMET C-series parts (C330C105KAR5TA, C330C105MAR5TA, C340C105K1R5TA, C340C105KAR5TA).

Q: What is the significance of the X7R temperature coefficient?

A: X7R specifies that capacitance change over the -55°C to 125°C operating range is limited to ±15%. This is a critical parameter for circuit stability. All substitute parts listed maintain X7R specification, ensuring equivalent temperature performance.

Q: Are KYOCERA AVX SkyCap® SR series parts direct replacements?

A: Yes. SR401C105MAATR1, SR401C105MAR, and SR751C105MARTR1 are direct electrical and mechanical equivalents to the M40R105M1-F. All maintain 1 µF ±20% 100V X7R specifications with 0.200" lead spacing and through-hole radial mounting. These are active products with full ROHS3 compliance.

Q: What does "Not For New Designs" mean for the TDK FK20X7R2A105KN000?

A: This designation indicates the manufacturer has discontinued active development and recommends against using this part in new product designs. It may be used for maintenance and repair of existing systems. Inventory availability may be limited. For new designs, select from active product status parts such as KYOCERA AVX or KEMET alternatives.

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