M40R105K1-F Equivalent & Substitute Parts

Part Overview

The M40R105K1-F is a 1 µF ±10% 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 equivalent substitute components for ongoing production and maintenance applications. The M40 series radial ceramic capacitor serves general-purpose filtering and coupling functions in electronic circuits requiring stable capacitance across the -55°C to 125°C operating temperature range.

Key Parameters

Parameter	Value	Significance for Substitution
Capacitance	1 µF	Critical - must match exactly
Voltage Rating	100V	Critical - must match or exceed
Tolerance	±10%	Critical - determines circuit performance
Temperature Coefficient	X7R	Critical - defines capacitance stability
Operating Temperature Range	-55°C to 125°C	Critical - environmental compatibility
Mounting Type	Through Hole Radial	Critical - PCB assembly compatibility
Lead Spacing	0.200" (5.08mm)	Critical - PCB footprint compatibility
RoHS Status	ROHS3 Compliant	Regulatory requirement
Moisture Sensitivity Level	1 (Unlimited)	Handling and storage compatibility

Substitute Part Grouping Explanation

Substitution eligibility for the M40R105K1-F is determined by strict equivalence across electrical and mechanical parameters. All substitute parts must satisfy the following criteria:

Electrical Requirements:

Capacitance: 1 µF (exact match)
Voltage Rating: 100V (exact match)
Tolerance: ±10% (exact match)
Temperature Coefficient: X7R (exact match)
Operating Temperature Range: -55°C to 125°C (exact match)

Mechanical Requirements:

Mounting Type: Through Hole Radial (exact match)
Lead Spacing: 0.200" (5.08mm) (exact match)
Lead Style: Straight or Formed Leads (both acceptable for through-hole assembly)

Regulatory Requirements:

RoHS3 Compliance (mandatory)
ECCN: EAR99 (export classification match)
HTSUS: 8532.24.0060 (tariff classification match)

Substitute parts may vary in physical dimensions (length, width, height) provided lead spacing remains 0.200" (5.08mm) and the component fits within typical PCB clearance specifications. Product status (Active, Not For New Designs, or Obsolete) does not disqualify a part from substitution but indicates availability and manufacturer support levels.

Parameter Comparison

Manufacturer	Part Number	Capacitance	Voltage	Tolerance	Temp Coeff	Temp Range	Lead Spacing	Product Status	RoHS3	Inventory
Cornell Dubilier Electronics	M40R105K1-F	1 µF	100V	±10%	X7R	-55°C ~ 125°C	0.200"	Obsolete	Yes	927 Pcs
KEMET	C340C105K1R5TA	1 µF	100V	±10%	X7R	-55°C ~ 125°C	0.200"	Active	Yes	3239 Pcs
TDK Corporation	FK20X7R2A105KN000	1 µF	100V	±10%	X7R	-55°C ~ 125°C	0.197"	Not For New Designs	Yes	1871 Pcs
TDK Corporation	FK22X7R2A105KN000	1 µF	100V	±10%	X7R	-55°C ~ 125°C	0.197"	Not For New Designs	Yes	47615 Pcs
TDK Corporation	FK26X7R2A105KN000	1 µF	100V	±10%	X7R	-55°C ~ 125°C	0.197"	Not For New Designs	Yes	6664 Pcs
Murata Electronics	RDER72A105K2K1H03B	1 µF	100V	±10%	X7R	-55°C ~ 125°C	0.197"	Active	Yes	3547 Pcs
Murata Electronics	RDER72A105K2M1H03A	1 µF	100V	±10%	X7R	-55°C ~ 125°C	0.197"	Active	Yes	12231 Pcs
KYOCERA AVX	SR211C105KAR	1 µF	100V	±10%	X7R	-55°C ~ 125°C	0.200"	Active	Yes	697 Pcs
KYOCERA AVX	SR211C105KARTR1	1 µF	100V	±10%	X7R	-55°C ~ 125°C	0.200"	Active	Yes	1157 Pcs
KYOCERA AVX	SR301C105KARTR1	1 µF	100V	±10%	X7R	-55°C ~ 125°C	0.200"	Active	Yes	850 Pcs
KYOCERA AVX	SR401C105KAA	1 µF	100V	±10%	X7R	-55°C ~ 125°C	0.200"	Active	Yes	936 Pcs

Engineering Selection Recommendations

Primary Substitutes (Exact Lead Spacing Match - 0.200"):

The following parts provide direct substitution with identical lead spacing to the M40R105K1-F:

C340C105K1R5TA (KEMET): Active product status with high inventory availability (3239 Pcs). GoldMax 300 Comm X7R series. Suitable for new designs and production continuity.
SR211C105KAR (KYOCERA AVX): Active product status. SkyCap® SR series with compact form factor. Inventory: 697 Pcs.
SR211C105KARTR1 (KYOCERA AVX): Active product status. Cut Tape packaging variant of SR211C105KAR. Inventory: 1157 Pcs.
SR301C105KARTR1 (KYOCERA AVX): Active product status. Tape & Reel packaging. Slightly larger physical dimensions (0.300" L). Inventory: 850 Pcs.
SR401C105KAA (KYOCERA AVX): Active product status. Largest form factor (0.400" L) matching original M40R105K1-F dimensions. Inventory: 936 Pcs.

Secondary Substitutes (Lead Spacing 0.197" - Functionally Equivalent):

The following parts meet all electrical and regulatory requirements with lead spacing of 0.197" (5.00mm), which is within standard PCB tolerance for through-hole radial components:

FK20X7R2A105KN000 (TDK): Not For New Designs status. FK series. Inventory: 1871 Pcs. Compact form factor (0.217" L x 0.157" W).
FK22X7R2A105KN000 (TDK): Not For New Designs status. FK series. Inventory: 47615 Pcs (highest availability). Moderate form factor (0.295" L x 0.157" W).
FK26X7R2A105KN000 (TDK): Not For New Designs status. FK series. Inventory: 6664 Pcs. Compact form factor (0.217" L x 0.138" W).
RDER72A105K2K1H03B (Murata): Active product status. RDE series. Inventory: 3547 Pcs. Compact form factor (0.217" L x 0.124" W).
RDER72A105K2M1H03A (Murata): Active product status. RDE series. Cut Tape packaging. Inventory: 12231 Pcs (second highest availability). Compact form factor (0.217" L x 0.124" W).

Selection Criteria:

For new production designs, prioritize Active status parts: C340C105K1R5TA, SR211C105KAR, SR211C105KARTR1, SR301C105KARTR1, SR401C105KAA, RDER72A105K2K1H03B, or RDER72A105K2M1H03A.

For maintenance and repair of existing M40R105K1-F assemblies, SR401C105KAA provides the closest physical match with identical lead spacing and straight lead style.

For high-volume applications requiring maximum inventory availability, FK22X7R2A105KN000 (47615 Pcs) or RDER72A105K2M1H03A (12231 Pcs) are suitable despite Not For New Designs or lead spacing variance.

All substitute parts are ROHS3 compliant and classified as EAR99 with HTSUS 8532.24.0060, ensuring regulatory and export compliance equivalence.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with 0.197" lead spacing instead of 0.200" on a PCB designed for the M40R105K1-F?

A: Yes. The 0.003" (0.076mm) difference is within standard PCB manufacturing tolerances for through-hole radial component footprints. Both lead spacings are functionally compatible with standard 0.200" pitch PCB holes. Verify PCB design specifications for any custom or tight-tolerance requirements.

Q: What is the difference between "Active," "Not For New Designs," and "Obsolete" product status?

A: Active products are currently manufactured and supported by the supplier for new designs. Not For New Designs indicates the manufacturer continues production for existing customers but does not recommend use in new applications. Obsolete products are no longer manufactured. For new production, select Active status parts. For maintenance of existing equipment using M40R105K1-F, any status is acceptable if electrical and mechanical parameters match.

Q: Are all substitute parts ROHS3 compliant like the original M40R105K1-F?

A: Yes. All listed substitute parts are ROHS3 compliant, meeting the same regulatory requirements as the original component. This ensures compatibility with modern manufacturing and environmental standards.

Q: What packaging options are available for substitute parts?

A: Substitute parts are available in multiple packaging formats: Bulk (loose components), Cut Tape (CT), and Tape & Reel (TR). Bulk packaging is suitable for small quantities and manual assembly. Cut Tape is appropriate for moderate volumes. Tape & Reel is optimized for high-volume automated assembly. Select packaging based on production volume and assembly equipment capabilities.

Q: Can I substitute a part with different physical dimensions if the lead spacing is correct?

A: Yes, provided the substitute component fits within PCB clearance specifications and does not interfere with adjacent components. Verify physical dimensions (length, width, height) against PCB layout constraints. Compact form factors (smaller dimensions) are universally compatible. Larger form factors require clearance verification.

Q: Which substitute offers the best availability for immediate procurement?

A: FK22X7R2A105KN000 (TDK) has the highest inventory at 47615 Pcs. RDER72A105K2M1H03A (Murata) is the second option with 12231 Pcs. C340C105K1R5TA (KEMET) offers 3239 Pcs with Active status. Inventory levels are subject to change; verify current availability with suppliers.

Q: Are there any performance differences between substitute parts with identical electrical specifications?

A: All substitute parts meet identical electrical specifications (1 µF, 100V, ±10%, X7R, -55°C to 125°C). Performance differences are negligible for general-purpose applications. Manufacturer-specific characteristics such as dielectric material formulation, manufacturing processes, and reliability data may vary slightly but do not affect functional compatibility in standard circuit applications.

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

A: X7R indicates the capacitor maintains capacitance stability across the full -55°C to 125°C operating range with maximum capacitance change of ±15% over temperature. This makes X7R suitable for general-purpose filtering and coupling applications where temperature stability is required. All substitute parts use identical X7R specification, ensuring equivalent thermal performance.

Q: Can I mix different substitute part manufacturers in the same PCB assembly?

A: Yes. All substitute parts meet identical electrical and mechanical specifications. Mixing manufacturers in the same assembly is acceptable from a functional standpoint. However, for production consistency and supply chain management, using a single manufacturer per design is recommended to simplify procurement, inventory tracking, and quality control.

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