0402X105K100CT - 1uF 10V X5R 0402 MLCC | Walsin | Decoupling
MPN: 0402X105K100CT β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.01 | $0.01 |
| 10 | $0.009 | $0.09 |
| 100 | $0.0082 | $0.82 |
| 500 | $0.005 | $2.50 |
| 1,000 | $0.004 | $4.00 |
Drop-in alternatives for 0402X105K100CT β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
0402S105K100CT
β Drop-Inπ Reference alternative (not in catalog)
0402ZD105KAT2A
β Drop-Inπ Reference alternative (not in catalog)
CC0402KRX5R6BB105
β Drop-Inπ Reference alternative (not in catalog)
0402X105K100CT Maximum Ratings & Electrical Characteristics
| Capacitance | 1 uF |
| Capacitance Tolerance | +/-10% (K) |
| Rated Voltage (DC) | 10 V |
| Dielectric | X5R (Class 2) |
| Operating Temperature Range | -55C to +85C |
| Temperature Coefficient | +/-15% over -55C to +85C |
| Package / Case Size | 0402 (1005 Metric) |
| Mounting Type | Surface Mount (SMD/SMT) |
| Technology | Multilayer Ceramic Capacitor (MLCC) |
| Termination Style | Solder-plated terminations, non-polar |
| Packaging | Tape & Reel (CT suffix) |
| Application Class | General purpose decoupling and filtering |
0402X105K100CT 0402 (1005 metric) Pin Configuration Guide
Complete pinout information for 0402X105K100CT (0402 (1005 metric) package). Learn about pin numbering, functions, and connection diagrams. Refer to the manufacturer datasheet for exact footprint and soldering guidelines. Common applications include circuit design and PCB assembly.
No detailed pinout data available for 0402X105K100CT.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
0402X105K100CT is suitable for 6 applications: Microcontroller Supply Decoupling, DC-DC Converter Input/Output Filtering, IoT and Wearable Device Power Rails, Consumer Electronics and Mobile Devices, Industrial Control and Automation Boards, RF Module and Wireless Communication Boards.
Microcontroller Supply Decoupling
The 0402X105K100CT is a standard choice for decoupling microcontroller supply pins such as STM32, STM8, and ARM Cortex-M class MCUs. Its 1 uF capacitance and small 0402 footprint place its self-resonance in the tens-to-hundreds of MHz region, giving low impedance exactly where logic switching transients demand charge. Placed within 2-3 mm of each VDD pin with short, wide traces, it suppresses ground bounce and supply ripple that would otherwise cause clock jitter or brownout resets. Because X5R capacitance derates under DC bias, at 3.3 V rails the effective capacitance is somewhat below nominal 1 uF but remains ample for per-pin decoupling when paired with local bulk capacitance.
Recommended
DC-DC Converter Input/Output Filtering
In buck and boost converter designs, the 0402X105K100CT serves as input decoupling for switching regulators and as output capacitance for low-current rails. For converter inputs, its 1 uF value and low ESR ceramic construction absorb the pulsed input current, reducing conducted EMI back onto the source rail; place it directly across the converter VIN and PGND pins. On outputs of small converters feeding 1.8 V to 5 V rails, the +/-10% X5R tolerance keeps output ripple predictable, though designers must budget for DC bias derating at higher rail voltages. For switching nodes up to the 10 V rating, this part provides a compact, reflow-compatible solution in dense power layouts.
Recommended
IoT and Wearable Device Power Rails
Battery-powered IoT nodes, smart sensors, and wearables demand maximum capacitance in minimum board area, which is exactly the 0402X105K100CT's value proposition: 1 uF in a 1.0 x 0.5 mm footprint. It decouples radios such as BLE and Wi-Fi modules whose transmit bursts draw sharp current spikes, and it buffers sensor supply rails against radio-induced droop. The X5R dielectric's -55C to +85C range covers typical indoor and wearable environments, though enclosed wearable designs exceeding +85C ambient should move to the X6S variant 0402S105K100CT. Its non-polar ceramic construction simplifies assembly and eliminates electrolytic lifetime concerns in long-deployment devices.
Recommended
Consumer Electronics and Mobile Devices
Smartphones, tablets, TWS earbuds, and set-top boxes place hundreds of MLCCs per board, and the 0402X105K100CT is a workhorse for their miscellaneous power and filter roles: baseband and application processor I/O rails, camera module supplies, audio codec AVDD decoupling, and display driver filtering. The tape-and-reel CT packaging supports high-speed pick-and-place at consumer volumes, and the commodity price point (around $0.004-0.01 as of 2026-09-14) suits cost-driven BOMs. Its +/-10% K tolerance is the standard grade accepted for consumer decoupling, while the 0402 size keeps routing channels open under dense BGA fans-outs and fine-pitch connector fields.
Recommended
Industrial Control and Automation Boards
Industrial PLC I/O modules, motor-control interface boards, and factory sensor nodes use the 0402X105K100CT to decouple isolated transceivers, gate-driver logic supplies, and 3.3 V/5 V micro rails in environments with electrical noise from motors and switching loads. Its 10 V rating comfortably covers standard 5 V and 3.3 V industrial logic rails with margin, and ceramic construction withstands vibration better than through-hole electrolytes. In noisy industrial settings, pairing this 1 uF with a ferrite bead or a small series resistor forms a pi-filter that attenuates conducted noise before it reaches sensitive controller pins, improving immunity on boards that must operate reliably for years in the field.
Recommended
RF Module and Wireless Communication Boards
RF modules, GPS receivers, and short-range wireless boards require low-impedance, low-parasitic decoupling at PA supply pins and VCO/PLL rails, where the 0402X105K100CT's tiny case minimizes series inductance and keeps the impedance dip at useful frequencies. Its 1 uF value complements the standard 100 pF/10 nF/1 uF decoupling ladder that places each capacitor's self-resonance over a different band. Designers should verify DC-bias-derated capacitance at the RF rail voltage and place the part with solid via-stitched ground connections so the low ESR advantage is not lost to trace inductance. The X5R dielectric is acceptable for supply decoupling, though C0G remains preferred inside tunable matching networks.
Recommended
Recommended Products Summary
Engineering reference data for 0402X105K100CT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | 0402S105K100CT | 0402ZD105KAT2A | CC0402KRX5R6BB105 |
|---|---|---|---|---|
| Package | 0402 (1005 Metric) | 0402 (1005 Metric) - same | 0402 (1005 Metric) - same | 0402 (1005 Metric) - same |
| Brand | Walsin | Walsin | Yageo | Yageo |
| Capacitance | 1 uF | 1 uF | 1 uF | 1 uF |
| Rated Voltage | 10 V | 10 V | 10 V (X5R, 6.3V code per Yageo nomenclature - verify datasheet) | 6.3 V (BB105 = X5R 6.3V; verify against requirement) |
| Tolerance | +/-10% | +/-10% | +/-10% | +/-10% |
| Dielectric | X5R | X6S | X5R | X5R |
| Temperature Range | -55C to +85C (X5R) | -55C to +105C (X6S) | -55C to +85C | -55C to +85C |
| Typical Unit Price (qty 1) | $0.0100 (as of 2026-09-14) | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- High capacitance density for the footprint (vs 0402B104K500CT)
- Extended temperature headroom option within the same brand (vs 0402S105K100CT)
- Higher voltage rating than the Yageo BB-series equivalent code (vs CC0402KRX5R6BB105)
Design Notes
DC bias derating is the number one pitfall with X5R MLCCs in 0402 case size. The nominal 1 uF capacitance of the 0402X105K100CT decreases as DC voltage approaches the 10 V rating - small-case X5R parts commonly lose 30-50% of nominal capacitance at a significant fraction of rated voltage (consult the manufacturer's DC bias characteristic curves in the Walsin datasheet for exact figures). Size your decoupling using the derated effective capacitance at your rail voltage, not the 1 uF nominal value, and add a parallel 0.1 uF part for high-frequency coverage.
Layout dominates MLCC performance. Place the 0402X105K100CT within 2-3 mm of the IC supply pin it decouples, with a solid, short ground connection - ideally an immediate via to the ground plane at each pad. Long thin traces add series inductance (roughly 1 nH per mm), which raises impedance exactly at the switching frequencies of concern. Avoid sharing one capacitor between multiple distant pins; one 1 uF per supply pin group with a nearby bulk capacitor (e.g., 4.7 uF 0402X475M6R3CT) gives the flattest supply impedance profile.
X5R capacitance also derates with temperature: combined with the +/-15% X5R temperature coefficient and the +/-10% initial tolerance, worst-case capacitance can deviate roughly +/-25% from nominal near the -55C to +85C range limits. For designs operating continuously above +70C ambient or below -40C, budget the extra margin or move to the same-footprint X6S variant (0402S105K100CT) which holds its capacitance to a higher upper temperature. Ceramics themselves handle heat well, but reflow and board flex cracking are the physical risks for 0402 parts - follow IPC handling guidelines for small MLCCs.
Compliance Information
Compliance declarations not included in the provided web data. DigiKey and Mouser listings for 0402X105K100CT publish per-part RoHS/REACH status - consult those listings for authoritative values.