KEMET C911U102MUWDBAWL20 Equivalent & Substitute Parts

Part Overview

The KEMET C911U102MUWDBAWL20 is a 1000 pF ceramic capacitor rated for 400VAC with Y5U temperature coefficient, designed for safety applications. This part is classified as obsolete, necessitating identification of active equivalent and substitute components that maintain functional compatibility within the C900AH SFTY X1-400 Y1-250 series. Active alternatives ensure continued availability and supply chain reliability for applications requiring X1 and Y1 safety ratings.

Key Parameters

Parameter	Value
Capacitance	1000 pF
Voltage Rating	400VAC
Tolerance	±20%
Temperature Coefficient	Y5U (E)
Operating Temperature Range	-40°C ~ 125°C
Safety Ratings	X1, Y1
Mounting Type	Through Hole
Package Type	Radial, Disc
Lead Spacing	0.394" (10.00mm)
Lead Style	Formed Leads - Kinked
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the C911U102MUWDBAWL20 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Capacitance value: 1000 pF (exact match required)
Voltage rating: 400VAC (exact match required)
Safety ratings: X1, Y1 (exact match required)
Mounting type: Through Hole (exact match required)
Lead spacing: 0.394" (10.00mm) (exact match required)
Operating temperature range: -40°C ~ 125°C (exact match required)

Tolerance and Temperature Coefficient Variations: Substitute parts are grouped into two categories based on allowed parameter variations:

Upgrade Substitutes (C941U Series): Temperature coefficient Y5P (B) with ±10% tolerance. Y5P provides tighter tolerance than the original Y5U (±20%), representing an upgrade in performance specification while maintaining all other critical parameters.
Similar Substitutes (C901U Series): Temperature coefficient Y5V (F) with ±20% tolerance. Y5V maintains the same tolerance as the original Y5U but differs in temperature coefficient classification, suitable for applications where the original tolerance specification is acceptable.

All substitute parts maintain ROHS3 compliance, X1/Y1 safety ratings, and identical lead spacing and mounting configuration.

Parameter Comparison

Parameter	C911U102MUWDBAWL20 (Original)	C941U102KUYDBAWL35 (Upgrade)	C941U102KUYDBAWL40 (Upgrade)	C941U102KUYDCAWL35 (Upgrade)	C941U102KUYDCAWL40 (Upgrade)	C941U102KVYDBAWL35 (Upgrade)	C941U102KVYDBAWL40 (Upgrade)	C941U102KVYDCAWL35 (Upgrade)	C941U102KVYDCAWL40 (Upgrade)	C901U102MUVDBAWL35 (Similar)	C901U102MUVDBAWL40 (Similar)
Capacitance	1000 pF	1000 pF	1000 pF	1000 pF	1000 pF	1000 pF	1000 pF	1000 pF	1000 pF	1000 pF	1000 pF
Voltage Rating	400VAC	400VAC	400VAC	400VAC	400VAC	400VAC	400VAC	400VAC	400VAC	400VAC	400VAC
Tolerance	±20%	±10%	±10%	±10%	±10%	±10%	±10%	±10%	±10%	±20%	±20%
Temperature Coefficient	Y5U (E)	Y5P (B)	Y5P (B)	Y5P (B)	Y5P (B)	Y5P (B)	Y5P (B)	Y5P (B)	Y5P (B)	Y5V (F)	Y5V (F)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Safety Ratings	X1, Y1	X1, Y1	X1, Y1	X1, Y1	X1, Y1	X1, Y1	X1, Y1	X1, Y1	X1, Y1	X1, Y1	X1, Y1
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package Type	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc	Radial, Disc
Lead Spacing	0.394" (10.00mm)	0.394" (10.00mm)	0.394" (10.00mm)	0.394" (10.00mm)	0.394" (10.00mm)	0.394" (10.00mm)	0.394" (10.00mm)	0.394" (10.00mm)	0.394" (10.00mm)	0.394" (10.00mm)	0.394" (10.00mm)
Lead Style	Formed Leads - Kinked	Formed Leads - Kinked	Formed Leads - Kinked	Formed Leads - Kinked	Formed Leads - Kinked	Formed Leads - Kinked	Formed Leads - Kinked	Formed Leads - Kinked	Formed Leads - Kinked	Formed Leads - Kinked	Formed Leads - Kinked
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

For Direct Replacement (Upgrade Path):

The C941U series (C941U102KUYDBAWL35, C941U102KUYDBAWL40, C941U102KUYDCAWL35, C941U102KUYDCAWL40, C941U102KVYDBAWL35, C941U102KVYDBAWL40, C941U102KVYDCAWL35, C941U102KVYDCAWL40) provides direct functional replacement with improved tolerance specification. All C941U variants maintain active product status, ROHS3 compliance, and identical electrical and mechanical parameters except for temperature coefficient classification (Y5P instead of Y5U) and tolerance improvement (±10% instead of ±20%). These parts are suitable for applications where tighter capacitance tolerance is beneficial or required.

For Functional Equivalence (Same Tolerance):

The C901U series (C901U102MUVDBAWL35, C901U102MUVDBAWL40) maintains the original ±20% tolerance specification with Y5V temperature coefficient classification. These parts are active, ROHS3 compliant, and electrically equivalent for applications where the original tolerance specification is the design requirement.

Selection Basis:

All substitute parts are active products with confirmed inventory availability. Selection between upgrade and similar categories depends on application tolerance requirements and temperature coefficient specifications. All candidates maintain X1 and Y1 safety ratings, 400VAC voltage rating, and identical mechanical mounting configuration.

Frequently Asked Questions (FAQ)

Q: Can C941U series parts directly replace the obsolete C911U102MUWDBAWL20?

A: Yes. The C941U series maintains identical capacitance (1000 pF), voltage rating (400VAC), safety ratings (X1, Y1), operating temperature range (-40°C ~ 125°C), lead spacing (0.394"/10.00mm), and mounting type (Through Hole Radial). The tolerance is improved from ±20% to ±10%, and the temperature coefficient changes from Y5U (E) to Y5P (B). These differences represent specification improvements rather than incompatibilities.

Q: What is the difference between C941U and C901U substitute options?

A: The C941U series provides ±10% tolerance with Y5P temperature coefficient. The C901U series maintains ±20% tolerance with Y5V temperature coefficient. Both series are electrically and mechanically compatible with the original part. Selection depends on whether the application requires tighter tolerance control (C941U) or maintains the original tolerance specification (C901U).

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (C941U and C901U series) are ROHS3 compliant, matching the compliance status of the original C911U102MUWDBAWL20.

Q: Do the substitute parts have the same physical dimensions?

A: Lead spacing and lead style are identical (0.394"/10.00mm, Formed Leads - Kinked). The C941U series has a larger disc diameter (0.433"/11.00mm) compared to the original (0.315"/8.00mm) and C901U series (0.276"/7.00mm). PCB layout must accommodate the larger footprint of C941U variants.

Q: What is the inventory status of substitute parts?

A: All substitute parts are active products with confirmed stock availability. C941U variants range from 657 to 1099 pieces in inventory. C901U variants have 903 to 922 pieces available.

Q: Are there any application restrictions for using substitute parts?

A: All substitute parts maintain X1 and Y1 safety ratings and 400VAC voltage specification. Physical footprint differences (disc diameter) require PCB layout verification for C941U variants. No electrical application restrictions exist for any listed substitute.

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