C1206C105K4RAC Kemet Capacitor (Capacitor Chip Non-polarised) In Stock
C1206C105K4RAC is a Kemet 1 µF X7R MLCC in 1206 SMD package rated at 16 V with ±10% capacitance tolerance. This temperature-stable Class II multilayer ceramic capacitor targets decoupling, bypass, and filter applications in industrial, automotive, and consumer electronics designs.
- Manufacturer
- Kemet
- Package
- Capacitor Chip Non-polarised
- Pin Count
- 2
- Lifecycle
- ACTIVE
- Datasheet
- C1206C105K4RAC Datasheet PDF
- Category
- Capacitor
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 1 µF capacitance in 1206 SMD package providing high capacitance density for decoupling applications
- X7R Class II dielectric maintaining capacitance within ±15% from -55°C to +125°C
- 16 V voltage rating with recommended 2:1 derating for reliable operation on 5 V and 12 V rails
- ±10% tolerance ensuring consistent filter and bypass performance across production lots
- Non-polarized construction allowing bidirectional placement without orientation concerns during assembly
Applications
C1206C105K4RAC is commonly placed at the VDD pins of microcontrollers, FPGAs, and power management ICs to suppress high-frequency switching noise and stabilize supply rails. Its 1 µF value provides effective decoupling between 1 MHz and 100 MHz, bridging the gap between smaller 100 nF capacitors and larger 10 µF bulk capacitors in three-tier decoupling networks. The 1206 package supports both prototyping with hand soldering and automated SMD reflow assembly in production.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How does C1206C105K4RAC perform as a decoupling capacitor across frequency compared to 100 nF MLCC options?
A 1 µF C1206C105K4RAC provides low impedance decoupling from approximately 500 kHz to 20 MHz, complementing a 100 nF capacitor that is effective above 5 MHz. Using both values in parallel on the same power rail creates a wideband bypass network covering 100 kHz to 100 MHz, which is recommended practice for microcontroller and FPGA VDD pins to suppress both low and high-frequency supply noise.
At what actual working voltage should C1206C105K4RAC be operated to meet reliability derating requirements?
The C1206C105K4RAC is rated at 16 V. Applying a standard 2:1 voltage derating limits the working voltage to 8 V maximum for high-reliability industrial and automotive designs. At 5 V rail applications, the derating factor is 3.2:1, providing significant reliability margin and extending capacitor lifetime in elevated temperature environments up to +125°C.
How does the 1206 package size of C1206C105K4RAC affect self-resonant frequency compared to smaller 0603 packages?
The 1206 package has a slightly higher equivalent series inductance (ESL) than a 0603 package, resulting in a lower self-resonant frequency (SRF) typically around 5 MHz to 15 MHz for 1 µF. For applications requiring decoupling above 20 MHz, using 0603 1 µF capacitors alongside C1206C105K4RAC reduces ESL contributions, while the 1206 part handles bulk charge delivery at lower frequencies.
Can C1206C105K4RAC replace a 1 µF tantalum capacitor in industrial power supply filtering?
Yes, C1206C105K4RAC can replace a 1 µF tantalum capacitor in most industrial filtering roles. Unlike tantalum capacitors that are susceptible to failure under voltage surge conditions, C1206C105K4RAC is inherently non-polarized and tolerates reverse voltage without degradation. It also exhibits lower ESR than tantalum at high frequencies, improving its effectiveness in switching regulator output filters above 100 kHz.
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