KEMET C901U300JYSDAAWL40 Equivalent & Substitute Parts

Part Overview

The KEMET C901U300JYSDAAWL40 is a 30 pF ±5% 400VAC ceramic capacitor with SL temperature coefficient, rated for safety applications (X1, Y2). This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement continuity. The part features through-hole radial disc construction with 10.00mm lead spacing, suitable for safety-rated circuit applications requiring high-voltage ceramic capacitor performance.

Key Parameters

Parameter	Value
Capacitance	30 pF
Tolerance	±5%
Voltage Rating	400VAC
Temperature Coefficient	SL
Operating Temperature Range	-40°C ~ 125°C
Safety Ratings	X1, Y2
Mounting Type	Through Hole
Package Type	Radial, Disc
Lead Spacing	0.394" (10.00mm)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the C901U300JYSDAAWL40 is determined by the following critical parameters:

Capacitance and Tolerance: All substitute parts maintain 30 pF ±5% to ensure circuit functionality and performance equivalence.

Temperature Coefficient: All parts retain SL temperature coefficient for consistent thermal behavior across the -40°C ~ 125°C operating range.

Safety Ratings: All parts maintain X1, Y2 safety classifications for compliance with safety-critical applications.

Mechanical Compatibility: All parts share identical through-hole radial disc construction, 7.00mm diameter, and 10.00mm lead spacing, ensuring direct PCB mounting compatibility without layout modifications.

Voltage Rating Distinction: Substitute parts are categorized into two groups based on voltage rating:

Parametric Equivalents (400VAC): Identical voltage rating to the main part
Upgrade Substitutes (440VAC): Higher voltage rating providing enhanced safety margin

Compliance: All parts are ROHS3 compliant and REACH unaffected, maintaining regulatory alignment.

Parameter Comparison

Part Number	Manufacturer	Capacitance	Tolerance	Voltage Rating	Temp Coeff	Operating Temp	Safety Ratings	Lead Spacing	Product Status	Inventory
C901U300JYSDAAWL40	KEMET	30 pF	±5%	400VAC	SL	-40°C ~ 125°C	X1, Y2	10.00mm	Obsolete	1070 Pcs
C901U300JYSDAAWL20	KEMET	30 pF	±5%	400VAC	SL	-40°C ~ 125°C	X1, Y2	10.00mm	Active	1023 Pcs
C901U300JYSDAAWL45	KEMET	30 pF	±5%	400VAC	SL	-40°C ~ 125°C	X1, Y2	10.00mm	Active	844 Pcs
C901U300JZSDAAWL20	KEMET	30 pF	±5%	440VAC	SL	-40°C ~ 125°C	X1, Y2	10.00mm	Active	1011 Pcs
C901U300JZSDAAWL45	KEMET	30 pF	±5%	440VAC	SL	-40°C ~ 125°C	X1, Y2	10.00mm	Active	780 Pcs

Engineering Selection Recommendations

For Direct Parametric Equivalence: Select C901U300JYSDAAWL20 or C901U300JYSDAAWL45 when exact electrical specifications matching the original 400VAC rating are required. Both parts are active products with full ROHS3 compliance and adequate inventory availability. These parts maintain identical voltage, capacitance, tolerance, and safety ratings.

For Enhanced Voltage Margin: Select C901U300JZSDAAWL20 or C901U300JZSDAAWL45 when circuit design permits operation at 440VAC rating. These upgrade substitutes provide 40VAC additional voltage headroom while maintaining all other electrical and mechanical parameters. Both are active products with ROHS3 compliance.

Inventory Considerations: All substitute parts maintain active product status with sufficient stock levels. C901U300JYSDAAWL20 offers the highest inventory (1023 Pcs), followed by C901U300JZSDAAWL20 (1011 Pcs), providing optimal procurement flexibility.

Frequently Asked Questions (FAQ)

Q: Can C901U300JYSDAAWL20 or C901U300JYSDAAWL45 be used as direct replacements for the obsolete C901U300JYSDAAWL40?

A: Yes. Both parts are parametric equivalents with identical capacitance (30 pF), tolerance (±5%), voltage rating (400VAC), temperature coefficient (SL), safety ratings (X1, Y2), and mechanical dimensions. They are active products suitable for direct substitution.

Q: What is the difference between the 400VAC and 440VAC rated parts?

A: The 440VAC rated parts (C901U300JZSDAAWL20 and C901U300JZSDAAWL45) provide 40VAC additional voltage rating compared to the 400VAC rated parts. All other electrical and mechanical parameters remain identical. The higher voltage rating offers increased safety margin in applications where circuit voltage permits.

Q: Are all substitute parts mechanically compatible with the original PCB layout?

A: Yes. All substitute parts share identical through-hole radial disc construction, 7.00mm diameter, and 10.00mm lead spacing. No PCB layout modifications are required for substitution.

Q: Do all substitute parts meet the same compliance standards as the original part?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, maintaining regulatory alignment with the original C901U300JYSDAAWL40.

Q: Which substitute part should be selected for new designs?

A: For new designs, select from the active product line: C901U300JYSDAAWL20, C901U300JYSDAAWL45, C901U300JZSDAAWL20, or C901U300JZSDAAWL45. Choose based on required voltage rating (400VAC or 440VAC) and packaging preference. All are active products with full support.

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