DMM4W1K-F Film Capacitor Equivalent & Substitute Parts

Part Overview

The DMM4W1K-F is a 1 µF film capacitor manufactured by Cornell Dubilier Electronics (CDE) rated for 400V DC operation with ±10% tolerance. This radial through-hole component utilizes polyester metallized dielectric technology and operates across the temperature range of -55°C to 125°C. The part is currently in active production status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified when design requirements permit voltage derating, dimensional tolerance, or manufacturer substitution while maintaining electrical performance in general-purpose applications.

Key Parameters

Parameter	Value	Unit
Capacitance	1	µF
Tolerance	±10%	—
Voltage Rating (DC)	400	V
Voltage Rating (AC)	200	V
Dielectric Material	Polyester, Metallized	—
Operating Temperature Range	-55 to 125	°C
Mounting Type	Through Hole	—
Package Type	Radial	—
Lead Spacing	27.50	mm
Termination	PC Pins	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution relationships for the DMM4W1K-F are established based on the following electrical and mechanical criteria:

Primary Substitution Criteria:

Capacitance value: 1 µF (exact match required)
Tolerance: ±10% (exact match required)
Voltage rating: 400V DC minimum (equal or higher ratings permitted)
Dielectric: Polyester, Metallized (material family match)
Temperature range: -55°C to 125°C (exact match required)
Mounting: Through Hole Radial (exact match required)
Termination: PC Pins (exact match required)

Substitution Categories:

Direct Equivalents – Identical electrical specifications and lead spacing (27.50 mm):

105MSR400K (Cornell Dubilier / Illinois Capacitor, MSR series)
B32524Q6105K000 (EPCOS - TDK Electronics, B3252* series)
B32523Q6105K000 (EPCOS - TDK Electronics, B3252* series)

Upgrade Equivalent – Higher voltage rating with identical lead spacing:

DME6W1K-F (Cornell Dubilier Electronics, DME series, 630V DC rating)

Similar Equivalent – Different lead spacing and package dimensions:

B32522N6105K000 (EPCOS - TDK Electronics, B3252* series, 450V DC rating, 15.00 mm lead spacing)

Parameter Comparison

Parameter	DMM4W1K-F	DME6W1K-F	105MSR400K	B32524Q6105K000	B32523Q6105K000	B32522N6105K000
Manufacturer	CDE	CDE	CDE / Illinois Capacitor	EPCOS - TDK	EPCOS - TDK	EPCOS - TDK
Series	DMM	DME	MSR	B3252*	B3252*	B3252*
Capacitance (µF)	1	1	1	1	1	1
Tolerance	±10%	±10%	±10%	±10%	±10%	±10%
Voltage Rating DC (V)	400	630	400	400	400	450
Voltage Rating AC (V)	200	250	200	200	200	200
Dielectric Material	Polyester, Metallized	Polyester, Metallized	Polyester, Metallized	Polyester, PET, Metallized	Polyester, PET, Metallized	Polyester, PET, Metallized
Operating Temperature (°C)	-55 to 125	-55 to 125	-55 to 125	-55 to 125	-55 to 125	-55 to 125
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	Radial	Radial	Radial	Radial	Radial	Radial
Lead Spacing (mm)	27.50	27.50	27.50	27.50	22.50	15.00
Termination	PC Pins	PC Pins	PC Pins	PC Pins	PC Pins	PC Pins
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	Not Applicable	1 (Unlimited)	Not Applicable	Not Applicable	Not Applicable
Product Status	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct PCB Replacement (27.50 mm Lead Spacing):

The 105MSR400K, B32524Q6105K000, and B32523Q6105K000 are direct electrical and mechanical equivalents to the DMM4W1K-F. All three parts maintain identical capacitance, tolerance, voltage rating, temperature range, and lead spacing. Selection among these three depends on manufacturer preference and supply chain availability. The B32524Q6105K000 and B32523Q6105K000 carry AEC-Q200 automotive qualification, suitable for applications requiring automotive-grade reliability. The 105MSR400K provides an alternative from the Illinois Capacitor / Cornell Dubilier product line.

For Voltage Derating Applications (27.50 mm Lead Spacing):

The DME6W1K-F offers a 630V DC rating while maintaining the same 27.50 mm lead spacing and all other electrical parameters. This upgrade equivalent is suitable when circuit design permits higher voltage margin or when future design revisions may require increased voltage headroom. The DME6W1K-F exhibits slightly larger physical dimensions (23.50 mm height vs. 22.00 mm) but remains compatible with standard through-hole PCB layouts designed for 27.50 mm spacing.

For Space-Constrained Designs (Reduced Lead Spacing):

The B32523Q6105K000 (22.50 mm lead spacing) and B32522N6105K000 (15.00 mm lead spacing) provide compact alternatives when PCB real estate is limited. The B32522N6105K000 represents the most compact option with 15.00 mm lead spacing and 18.50 mm height. Both EPCOS parts carry AEC-Q200 qualification. The B32522N6105K000 operates at 450V DC, providing 50V additional margin over the 400V requirement.

Compliance and Certification:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the DMM4W1K-F. All parts are classified under ECCN EAR99 and HTSUS 8532.25.0070.

Frequently Asked Questions (FAQ)

Q: Can the DME6W1K-F be used as a direct replacement for the DMM4W1K-F?

A: Yes. The DME6W1K-F is electrically and mechanically compatible with identical lead spacing (27.50 mm). The higher 630V DC rating does not prevent substitution in circuits designed for 400V operation. Physical dimensions differ slightly (23.50 mm height vs. 22.00 mm), but this remains within standard through-hole PCB tolerances.

Q: What is the difference between the B32524Q6105K000 and B32523Q6105K000?

A: Both parts are EPCOS B3252* series equivalents with identical electrical specifications (1 µF, ±10%, 400V DC). The primary difference is lead spacing: B32524Q6105K000 uses 27.50 mm spacing (direct replacement), while B32523Q6105K000 uses 22.50 mm spacing (compact layout). Both carry AEC-Q200 automotive qualification.

Q: Can I use the B32522N6105K000 in place of the DMM4W1K-F?

A: The B32522N6105K000 is electrically compatible (1 µF, ±10%, 450V DC) but uses 15.00 mm lead spacing instead of 27.50 mm. PCB modification is required. This part is suitable only if the circuit board layout can accommodate the reduced lead spacing.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (DME6W1K-F, 105MSR400K, B32524Q6105K000, B32523Q6105K000, B32522N6105K000) are ROHS3 compliant and REACH unaffected, matching the regulatory status of the DMM4W1K-F.

Q: What does MSL 1 (Unlimited) mean for the DMM4W1K-F?

A: MSL 1 indicates the lowest moisture sensitivity level. The component has unlimited shelf life and requires no special moisture control during storage or handling. EPCOS parts listed as "Not Applicable" for MSL indicate they do not require moisture sensitivity classification.

Q: Which substitute part has the smallest physical footprint?

A: The B32522N6105K000 has the smallest dimensions (18.00 mm length × 11.00 mm width, 18.50 mm height) with 15.00 mm lead spacing. This part is suitable for space-constrained applications where PCB layout permits the reduced lead spacing.

Q: Do any substitute parts have published ESR specifications?

A: The 105MSR400K specifies ESR of 1.768 Ohms. Other substitute parts do not provide ESR data in their standard specifications. Contact the manufacturer for detailed ESR information if this parameter is critical for your application.

Q: Can I mix different manufacturers' parts in the same circuit board?

A: Yes. All substitute parts meet identical electrical specifications (1 µF, ±10%, 400V DC minimum, -55°C to 125°C). Mixing manufacturers is acceptable from an electrical standpoint. Verify lead spacing compatibility with your PCB layout before assembly.

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