CAS21C472KARFC

CAS21C472KARFC is a fixed surface-mount multilayer ceramic capacitor (MLCC). The 472K code translates to a capacitance of 4700 pF = 4.7 nF, with a tolerance of ±10% (K). The remaining ARFC letters encode voltage rating, dielectric type (e.g., X5R/X7R) and RoHS/lead-free status, which vary by manufacturer. The CAS21C family denotes a specific series/dimension in the vendor’s MLCC lineup; exact details (dielectric class, voltage, package size) must be confirmed from the supplier’s datasheet. Typical use: decoupling and filtering in PCB designs. For precise specs, look up CAS21C472KARFC in a distributor catalog (e.g., Mouser, Digi-Key) and review the datasheet.

I can’t determine the exact pin count or function from that code alone. CAS21C472KARFC appears to be a 4.7 nF (472) capacitor with K tolerance, but “CAS” covers capacitor arrays, filters, and other capacitor-based devices, with multiple package options. Pin count and the function (whether a single capacitor, a capacitor array, or an EMI/filter network) depend on the specific variant. Please provide the manufacturer or a datasheet/link for the exact package.

Typical applications for CAS21C472KARFC (4.7 nF, 10% tolerance ceramic capacitor):
- Decoupling/bypassing on power rails for microcontrollers, CPUs, and analog ICs
- Filtering of DC rails and high-frequency noise in switching regulators and power supplies
- RC timing, signal shaping, and small-signal filtering in digital/analog paths
- AC coupling and impedance matching in audio and RF circuits
- EMI/RFI suppression and transient damping in automotive, industrial, and consumer electronics
- General purpose smoothing and stabilization in PCB assemblies requiring small, reliable ceramic caps

It's a surface‑mount (SMT) chip ceramic capacitor, in the CAS21C package (case size CAS21C).