Knowles Syfer 2220Y1K20331MXT Ceramic Capacitor - Equivalent & Substitute Parts

Part Overview

The Knowles Syfer 2220Y1K20331MXT is an active, ROHS3-compliant multilayer ceramic capacitor (MLCC) rated for 1200V operation with 330 pF capacitance and X7R temperature stability. This component is designed for high-voltage applications requiring soft termination and boardflex-sensitive mounting. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required for circuit redesign, supply chain optimization, or performance enhancement within the same package footprint.

Key Parameters

Parameter	Value	Significance for Substitution
Capacitance	330 pF	Must remain constant for circuit function
Voltage Rating	1200V (1.2kV)	Minimum voltage requirement; higher ratings acceptable
Temperature Coefficient	X7R	Defines capacitance stability across operating range
Package / Case	2220 (5750 Metric)	Physical footprint and mounting compatibility
Mounting Type	Surface Mount, MLCC	Assembly process compatibility
Operating Temperature	-55°C ~ 125°C	Environmental performance range
Compliance	ROHS3, REACH Unaffected	Regulatory and environmental requirements

Substitute Part Grouping Explanation

Substitution eligibility for the 2220Y1K20331MXT is determined by the following criteria:

Fixed Parameters (Non-Negotiable):

Capacitance: 330 pF (exact match required)
Package / Case: 2220 (5750 Metric) (physical compatibility)
Temperature Coefficient: X7R (thermal stability requirement)
Mounting Type: Surface Mount, MLCC (assembly compatibility)
Operating Temperature Range: -55°C ~ 125°C (environmental specification)

Flexible Parameters (Upgrade Acceptable):

Voltage Rating: Minimum 1200V; higher ratings are acceptable substitutes
Tolerance: ±20% or tighter (±10% represents improvement)
Thickness: Variation acceptable if within assembly constraints

The identified substitute part meets all fixed parameters while offering enhanced voltage rating and improved tolerance specification.

Parameter Comparison

Parameter	2220Y1K20331MXT (Main)	2220Y4K00331KXT (Substitute)	Compatibility Notes
Manufacturer	Knowles Syfer	Knowles Syfer	Same manufacturer
Capacitance	330 pF	330 pF	Exact match
Tolerance	±20%	±10%	Substitute offers tighter tolerance
Voltage Rating	1200V (1.2kV)	4000V (4kV)	Substitute rated for higher voltage
Temperature Coefficient	X7R	X7R	Exact match
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	Exact match
Package / Case	2220 (5750 Metric)	2220 (5750 Metric)	Exact match
Mounting Type	Surface Mount, MLCC	Surface Mount, MLCC	Exact match
Features	Soft Termination	Soft Termination	Exact match
Series	FlexiCap™	FlexiCap™	Same series
Thickness (Max)	0.165" (4.20mm)	0.098" (2.50mm)	Substitute is thinner; verify PCB assembly clearance
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Exact match
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Exact match
Product Status	Active	Active	Both actively manufactured

Engineering Selection Recommendations

Primary Part (2220Y1K20331MXT): Select when circuit design specifies 1200V maximum voltage rating and ±20% tolerance is acceptable. This part is active and ROHS3-compliant, suitable for standard high-voltage applications.

Substitute Part (2220Y4K00331KXT): Select as a direct substitute when:

Circuit voltage stress is below 4000V and higher voltage margin is beneficial
Tighter capacitance tolerance (±10%) improves circuit performance
Thinner profile (2.50mm vs. 4.20mm) accommodates space-constrained PCB layouts
Supply chain availability favors the substitute part

Both parts are active products with identical compliance certifications (ROHS3, REACH Unaffected) and regulatory status (ECCN: EAR99, HTSUS: 8532.24.0020). Selection between them is based on circuit voltage requirements and tolerance specifications rather than regulatory or manufacturing status.

Frequently Asked Questions (FAQ)

Q: Can 2220Y4K00331KXT replace 2220Y1K20331MXT in all applications?

A: Yes, provided the circuit voltage stress remains below 4000V. The substitute part maintains identical capacitance, temperature coefficient, and operating temperature range. The higher voltage rating and tighter tolerance represent improvements over the original specification.

Q: What is the impact of the thickness difference (4.20mm vs. 2.50mm)?

A: The substitute part is 1.70mm thinner. This reduces overall component height and may improve PCB assembly density. Verify that the thinner profile does not conflict with solder reflow profiles, component placement equipment, or adjacent circuit elements.

Q: Are both parts suitable for boardflex-sensitive applications?

A: Yes. Both parts feature soft termination and are specified for boardflex-sensitive mounting. The FlexiCap™ series designation confirms this capability for both the main part and substitute.

Q: Does the ±10% tolerance of the substitute part affect circuit compatibility?

A: The tighter tolerance of the substitute part (±10% vs. ±20%) reduces capacitance variation and typically improves circuit performance. This is not a compatibility issue but rather a specification enhancement.

Q: Are there any moisture sensitivity concerns with either part?

A: No. Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity limitations. Standard handling and storage practices apply.

Q: Can these parts be used interchangeably on the same PCB assembly?

A: Yes, both parts use identical 2220 (5750 Metric) package footprints and surface mount assembly processes. PCB layout and reflow profiles require no modification for substitution.

Q: What is the inventory status for each part?

A: 2220Y1K20331MXT: 662 pcs in stock. 2220Y4K00331KXT: 842 pcs in stock. Both are available as new original components.

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