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Home Products Capacitors Ceramic Capacitors~~2225J0250394MXT~~

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2225J0250394MXT - Knowles Syfer

Name: Knowles Syfer 2225J0250394MXT
Brand: Knowles Syfer
SKU: 2225J0250394MXT
Price: 3.171 USD
Availability: InStock
Rating: 5 (9 reviews)

Manufacturer Part Number: 2225J0250394MXT

Manufacturer: Knowles Syfer

Allelco Part Number: 98D-2225J0250394MXT

Warranty: 1 Year Allelco Warranty - Find out more

Stock Status:: 41,798 pcs available, New & Original

Parts Description: CAP CER 0.39UF 25V X7R 2225

Package: 2225 (5763 Metric)

Data sheet: 2225J0250394MXT.pdf

HTML Datasheet
MLCC Capacitor Datasheet.pdf

Environmental Information
Environmental Status Syfer.pdf

RoHs Status: ROHS3 Compliant

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Specifications

2225J0250394MXT Tech Specifications
Knowles Syfer - 2225J0250394MXT technical specifications, attributes, parameters and parts with similar specifications to Knowles Syfer - 2225J0250394MXT

Product Attribute	Attribute Value
Manufacturer	Knowles Syfer
Voltage - Rated	25V
Tolerance	±20%
Thickness (Max)	0.098" (2.50mm)
Temperature Coefficient	X7R
Size / Dimension	0.224" L x 0.248" W (5.70mm x 6.30mm)
Series	-
Ratings	-
Package / Case	2225 (5763 Metric)
Package	Tape & Reel (TR)

Product Attribute	Attribute Value
Operating Temperature	-55°C ~ 125°C
Mounting Type	Surface Mount, MLCC
Lead Style	-
Lead Spacing	-
Height - Seated (Max)	-
Features	-
Failure Rate	-
Capacitance	0.39 µF
Base Product Number	2225J
Applications	General Purpose

Environmental & Export Classifications

ATTRIBUTE	DESCRIPTION
RoHs Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
ECCN	EAR99
HTSUS	8532.24.0020

Frequently Asked Questions(FAQ)

What makes the 2225J0250394MXT suitable for low-voltage power distribution circuits compared to larger case sizes?: The 2225J0250394MXT is a 0.39µF ceramic capacitor in the 2225 (5.70mm × 6.30mm) form factor, positioned between smaller 1812 packages and larger 1210 sizes. Its 25V rating and X7R dielectric allow stable performance across the -55°C to 125°C operating range without significant capacitance drift, making it practical for decoupling and filtering in 12V to 24V rail applications where board space is moderately constrained. The ±20% tolerance is acceptable for general-purpose bypass roles where exact capacitance is non-critical, though precision circuits may require tighter selection or parallel configurations of the 2225J0250394MXT.

How does the X7R temperature coefficient of the 2225J0250394MXT affect performance in automotive under-hood environments?: The 2225J0250394MXT employs X7R dielectric material, which maintains capacitance within ±15% across its full -55°C to 125°C operating window—a critical requirement for automotive thermal cycling. Unlike X5R dielectrics that show steeper capacitance drop at temperature extremes, the X7R formulation in the 2225J0250394MXT ensures predictable filtering behavior during cold-start conditions and sustained high-temperature operation. For under-hood applications, this stability reduces the risk of filter resonance shift or inadequate bypass effectiveness during thermal transients, though designers should verify the ±20% manufacturing tolerance doesn't compound worst-case capacitance loss when multiple 2225J0250394MXT units are paralleled.

Why is MSL 1 (Unlimited) moisture sensitivity significant for the 2225J0250394MXT in high-reliability assembly processes?: The 2225J0250394MXT carries MSL 1 (Unlimited) rating, meaning it requires no moisture bake-out before reflow soldering and can be stored indefinitely without desiccant packaging. This eliminates a process constraint common to MSL 2–3 components and reduces handling risk during pick-and-place operations. In contract manufacturing or just-in-time supply chains, the 2225J0250394MXT's MSL 1 status lowers total cost of ownership by avoiding expensive moisture control procedures. However, this benefit assumes proper printed circuit board design—the 2225J0250394MXT itself won't fail, but surrounding PCB laminate can still delaminate if moisture ingress and reflow temperature cycling aren't managed.

What is the practical difference between the 2225J0250394MXT and a 1206 ceramic capacitor of equivalent value for high-frequency switching supplies?: The 2225J0250394MXT occupies approximately 35% more board area than a 1206 package but offers lower equivalent series resistance (ESR) and inductance (ESL) due to its larger termination pads and internal conductor geometry. In switching-supply input filtering near 25V rails, the 2225J0250394MXT's lower ESL means faster charge delivery to the load during transient current steps, reducing peak voltage overshoot compared to smaller 1206 alternatives. Conversely, if board routing permits only a 1206, paralleling multiple 1206s will outperform a single 2225J0250394MXT by aggregating ESL reduction. The choice depends on switching frequency (>100kHz favors the 2225J0250394MXT) and available PCB real estate rather than capacitance alone.

How does the 0.39µF capacitance of the 2225J0250394MXT relate to filter cutoff frequency in audio coupling applications?: The 2225J0250394MXT's 0.39µF nominal value combines with typical source/load impedance to set AC coupling frequency response. For a 10kΩ input impedance, the -3dB corner frequency is approximately 41Hz (f = 1/[2π × R × C]), which suits audio line-level coupling. At a higher 1kΩ impedance, the 2225J0250394MXT shifts the corner to ~410Hz, requiring parallel combinations to lower cutoff. The ±20% tolerance means worst-case low-capacitance units (0.312µF) raise cutoff by 28%, potentially audible in bass-heavy program material. Designers selecting the 2225J0250394MXT for audio should either specify the tighter KemDal or military-grade tolerance variants or design circuits that tolerate the stated ±20% variation in crossover frequency.

Is the 2225J0250394MXT suitable for replacing older tantalum capacitors in legacy 25V circuits, and what precautions apply?: The 2225J0250394MXT's 25V rating and X7R stability make it mechanically compatible with many tantalum replacements, but electrical behavior differs significantly. Tantalum exhibits lower ESR at high frequency, while the ceramic 2225J0250394MXT's ESR is frequency-dependent and rises at DC bias; in filtering roles near the 0.39µF rated value, the 2225J0250394MXT may show slightly higher ripple voltage. Additionally, tantalum fails short-circuit whereas the 2225J0250394MXT typically opens, requiring fault-tolerance review. The ±20% tolerance of the 2225J0250394MXT is wider than many tantalum grades, so parallel combinations or circuit re-tuning may be necessary. For cost-sensitive redesigns, the 2225J0250394MXT is viable, but thermal cycling performance and voltage derating curves must be re-validated in the new design.

What thickness and routing constraints should account for the 2225J0250394MXT's 2.50mm maximum profile?: The 2225J0250394MXT's 2.50mm seated height is taller than 1206 or 1812 packages and requires PCB design clearance above the mounted component to prevent solder-joint stress during conformal coating or potting operations. In stacked-board assemblies or systems with restricted vertical space (e.g., handheld devices, compact IoT nodes), the 2225J0250394MXT may violate mechanical envelopes despite its footprint seeming reasonable. Thermal imaging during high-temperature excursions should verify the 2225J0250394MXT's lead temperature doesn't exceed the PCB glass-transition specification; taller components experience greater temperature differential across the board thickness. For high-density designs, consider spacing the 2225J0250394MXT at least 3mm from mechanical edges to reduce mechanical shock transmission during transport or installation.

How should the ±20% tolerance of the 2225J0250394MXT be managed in precision filter designs requiring stable cutoff frequency?: The 2225J0250394MXT's ±20% tolerance (nominal 0.39µF ranging 0.312µF to 0.468µF) introduces ±20% filter-response uncertainty unsuitable for precision applications without mitigation. In active filter topologies, the 2225J0250394MXT can be paralleled with a precision trimmer potentiometer (for analog tuning) or replaced with tighter tolerance variants (C0G/NP0 alternatives exist from Knowles Syfer at ±5% or ±10%). For digital audio or signal conditioning, the 2225J0250394MXT's tolerance becomes acceptable if downstream firmware includes frequency-response calibration during manufacturing test. Selecting multiple 2225J0250394MXT units from the same tape reel reduces statistical spread through binning, though supplier guarantees rarely support this. For critical applications, budget 15–20% capacitor overage to ensure at least one section of parallel 2225J0250394MXT units meets tight specifications.

What voltage derating should apply when using the 2225J0250394MXT in 24V industrial power supplies exceeding ambient temperature 70°C?: The 2225J0250394MXT is rated 25V at 20°C reference, but ceramic capacitor voltage withstand degrades at elevated temperature. At 100°C ambient, typical derating curves for X7R ceramics suggest operating voltage should not exceed 85–90% of rating, limiting the 2225J0250394MXT to approximately 21–22.5V. In 24V systems, this creates marginal headroom; transient voltage spikes during switching or fault conditions could exceed the derated 2225J0250394MXT rating. Designers should either reduce DC bias point to <20V nominal, apply surge suppression upstream, or parallel multiple 2225J0250394MXT units to distribute stress. Temperature-compensated designs (e.g., reducing input voltage automatically above 70°C) are more reliable than relying on the 2225J0250394MXT's passive tolerance.

How does the 2225J0250394MXT perform in bipolar circuits where AC signal swings both above and below ground reference?: The 2225J0250394MXT is a DC-rated component (25V refers to maximum continuous DC bias), so AC signals must remain within the rated envelope. In AC-coupled signal paths where the 2225J0250394MXT blocks DC but passes AC, the peak AC voltage plus DC operating point must not exceed ±25V. For example, a 10V DC bias with ±15V AC swing violates the 2225J0250394MXT rating. In true bipolar circuits (±12V rails, AC-centered at ground), the 2225J0250394MXT must be selected for twice the peak voltage requirement; a ±12V system needs a 50V rated capacitor, not the 25V 2225J0250394MXT. Designers often misapply 25V ceramics in bipolar audio or instrumentation circuits; verifying the 2225J0250394MXT against actual voltage envelope is essential to prevent in-field failures.

Is the 2225J0250394MXT's RoHS3 compliance and REACH Unaffected status sufficient for medical device or aerospace component qualification?: The 2225J0250394MXT meets RoHS3 (restriction of hazardous substances) and carries REACH Unaffected status, meaning it does not contain Substances of Very High Concern requiring additional declaration. For commercial electronics, this satisfies environmental compliance. However, medical devices (Class II/III), aerospace, and defense applications typically require component-level certifications beyond RoHS/REACH, such as AEC-Q200 automotive qualification, IPC-A-610 workmanship, or traceability to lot-level test data. The 2225J0250394MXT datasheet does not explicitly reference these qualifications, so end-users must contact Knowles Syfer directly or source aerospace-grade variants if these standards apply. RoHS3 compliance of the 2225J0250394MXT does not guarantee suitability for high-reliability applications; qualification testing remains the responsibility of the system integrator.

How should the 2225J0250394MXT be handled during rework operations if a circuit board fails post-manufacturing test?: The 2225J0250394MXT arrives in tape-and-reel packaging (TR) and is typically reflowed once during initial assembly. During rework, the component experiences a second thermal cycle; X7R dielectric undergoes microstructural stress that can reduce mechanical strength and increase voltage leakage in subsequent thermal transients. If the 2225J0250394MXT must be removed and replaced, best practice involves: (1) gentle heat-ramping to avoid thermal shock, (2) immediate post-reflow visual inspection for cracks, and (3) if possible, replacement with a new 2225J0250394MXT unit rather than re-using the removed component. Multiple rework cycles of the same 2225J0250394MXT unit are not recommended without intermediate reliability testing. For high-volume production, budgeting 2–3% rework loss of the 2225J0250394MXT is typical.

What is the expected DC leakage current of the 2225J0250394MXT at rated voltage and maximum operating temperature?: The 2225J0250394MXT datasheet does not explicitly specify leakage current, a common omission for general-purpose ceramic capacitors. Typical X7R ceramics at 25V and 125°C show leakage on the order of 100–500 nanoamps per microfarad; for the 2225J0250394MXT's 0.39µF value, this predicts 39–195nA leakage at worst case. In low-power circuit applications (e.g., timing circuits, precision analog), this leakage is usually negligible. However, for ultra-low-power systems (sub-microamp quiescent current budgets), the cumulative leakage of multiple 2225J0250394MXT units in parallel can become significant. Designers should request detailed leakage specifications from Knowles Syfer or measure a sample 2225J0250394MXT unit during design validation if leakage-dependent performance is critical.

How does the 2225J0250394MXT compare in cost-per-microfarad and board-area efficiency versus stacking multiple smaller capacitors?: A single 2225J0250394MXT provides 0.39µF in a 2225 footprint (35.82 mm²). Achieving the same capacitance with 1206 units (1mm² smaller footprint per unit) would require two 0.22µF 1206s to approximate the 2225J0250394MXT value, consuming roughly 9.1 mm² more board area total when accounting for routing clearance. Cost comparison is vendor-dependent, but bulk purchasing often makes a single 2225J0250394MXT cheaper than two 1206s plus the assembly labor and BOM complexity. In manual or prototype assembly, the 2225J0250394MXT reduces handling steps and solder-joint count. For very-high-volume production, stacking smaller capacitors may offer marginal cost advantage if feeder availability and placement-machine tooling are already optimized; for mid-volume designs (10k–100k units annually), the 2225J0250394MXT's simplicity typically wins.

Parts with Similar Specifications

The three parts on the right have similar specifications to Knowles Syfer 2225J0250394MXT

Product Attribute
Part Number	2225J0250394MDT	2225J0250394MXR	2225J0250394JXT	2225J0250394KXT
Manufacturer	Knowles Syfer	Knowles Syfer	Knowles Syfer	Knowles Syfer
Base Product Number	-	DAC34H84	MAX500	ADS62P42
Mounting Type	-	Surface Mount	Through Hole	Surface Mount
Lead Spacing	-	-	-	-
Height - Seated (Max)	-	-	-	-
Features	-	-	-	Simultaneous Sampling
Applications	-	-	-	-
Lead Style	-	-	-	-
Thickness (Max)	-	-	-	-
Package / Case	-	196-LFBGA	16-DIP (0.300', 7.62mm)	64-VFQFN Exposed Pad
Size / Dimension	-	-	-	-
Voltage - Rated	-	-	-	-
Failure Rate	-	-	-	-
Ratings	-	-	-	-
Series	-	-	-	-
Tolerance	-	-	-	-
Capacitance	-	-	-	-
Package	-	Tape & Reel (TR)	Tube	Tape & Reel (TR)
Operating Temperature	-	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C
Temperature Coefficient	-	-	-	-

2225J0250394MXT Datasheet PDF

Download 2225J0250394MXT pdf datasheets and Knowles Syfer documentation for 2225J0250394MXT - Knowles Syfer.

HTML Datasheet: MLCC Capacitor Datasheet.pdf
Environmental Information: Environmental Status Syfer.pdf

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Customer Reviews

Evaluation: 10 Articles

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Used for repair of an older automotive ECU. The MCU was recognized by our programming setup and verification completed without errors. The repaired board now starts and communicates normally.
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Aug 31, 2026

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Aug 28, 2026

I needed this ADC for an older data acquisition board. Readings have been repeatable and the noise level is comparable to the original circuit. Happy with the purchase.
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