C0603X123J3JAC7867 vs C0603X122J3JAC7867

Part Number	C0603X123J3JAC7867	C0603X122J3JAC7867
Category	Ceramic Capacitors	Ceramic Capacitors
Manufacturer	KEMET	KEMET
Description	CAP CER 0.012UF 25V U2J 0603	CAP CER 1200PF 25V U2J 0603
Package	Tape & Reel (TR)	Tape & Reel (TR)
Series	SMD Comm U2J Flex	SMD Comm U2J Flex
Features	Low ESL, Soft Termination, Low Dissipation Factor	Low ESL, Soft Termination, Low Dissipation Factor
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C
Mounting Type	Surface Mount, MLCC	Surface Mount, MLCC
Package / Case	0603 (1608 Metric)	0603 (1608 Metric)
Applications	Boardflex Sensitive	Boardflex Sensitive
Tolerance	±5%	±5%
Temperature Coefficient	U2J	U2J
Size / Dimension	0.063" L x 0.031" W (1.60mm x 0.80mm)	0.063" L x 0.031" W (1.60mm x 0.80mm)
Voltage - Rated	25V	25V
Lead Spacing	-	-
Thickness (Max)	0.034\" (0.87mm)	0.034\" (0.87mm)
Ratings	-	-
Height - Seated (Max)	-	-
Capacitance	0.012 µF	1200 pF
Lead Style	-	-
Failure Rate	-	-

1. How do I know if my ceramic capacitor is bad?

Visual inspection: Check for cracks, bulges, or other physical damage.
Multimeter test: Measure the capacitance value to see if it is close to the nominal value, and check for shorts or opens.
2. Should ceramic capacitors have continuity?

A properly functioning ceramic capacitor should show a certain capacitance value between its pins, not completely on or off.
3. Why do ceramic capacitors make noise?

Some types of ceramic capacitors (particularly Class 2 ceramic capacitors) produce micro-vibrations when the voltage changes due to their material properties, which in turn cause faint mechanical noise.
4. What is the difference between Class 1 and Class 2 ceramic capacitors?

Class 1: has high accuracy and stable temperature coefficient, suitable for precision circuits.
Class 2: has higher capacitance value, but larger temperature coefficient and tolerance, suitable for general applications.