MLCC Selection Guide
Multilayer Ceramic Capacitors (MLCCs) are essential components in modern electronics. This guide covers the key selection criteria for choosing the right MLCC for your application.
Dielectric Selection
The dielectric material determines the capacitor's temperature and voltage characteristics:
- C0G (NP0) - Class I ceramic with ultra-stable capacitance (0±30ppm/°C). Best for precision timing, RF circuits, and filters. Limited capacitance range (0.5pF to 47nF).
- X7R - Class II ceramic with ±15% capacitance change over -55°C to +125°C. Good for general-purpose decoupling and filtering. Wide capacitance range (100pF to 47µF).
- X5R - Class II ceramic with ±15% capacitance change over -55°C to +85°C. Cost-effective for consumer electronics. Capacitance range 1nF to 100µF.
Case Size Selection
Case size affects capacitance density, current capability, and DC bias performance:
- 0201/0402 - For space-constrained mobile devices
- 0603/0805 - General purpose, best availability
- 1206/1210 - Higher capacitance and current capability
Voltage Rating
Always apply voltage derating for reliability:
- Standard derating - 80% of rated voltage (20% margin)
- High-reliability - 50% of rated voltage
- Automotive - Typically 50% derating per AEC guidelines
DC Bias Effect
Class II ceramics (X7R, X5R) exhibit capacitance reduction under DC voltage. The effect is more severe with smaller case sizes and higher capacitance values. Always consult DC bias curves in the datasheet.
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Frequently Asked Questions
1. What is the difference between C0G and X7R dielectrics?
C0G (NP0) is a Class I ceramic with near-zero temperature coefficient (0±30ppm/°C), making it ideal for precision applications. X7R is a Class II ceramic with ±15% capacitance variation over temperature, offering higher capacitance density but less stability. C0G is best for RF, timing, and precision circuits; X7R is suitable for general decoupling and filtering where stability is less critical.
2. How much DC bias capacitance loss should I expect?
DC bias loss in X7R/X5R capacitors depends on case size, capacitance, and voltage. At 50% of rated voltage, expect 20-40% capacitance loss. The loss is more severe with smaller case sizes - a 10µF/6.3V 0603 capacitor may lose 60% of capacitance at 5V. To minimize DC bias effects: use larger case sizes, select higher voltage ratings, or use C0G dielectric which has no DC bias effect.
3. What is the minimum order quantity for HJC capacitors?
Minimum order quantities (MOQ) vary by product type: MLCCs typically 10,000-100,000 pieces depending on case size, Aluminum electrolytics 1,000-10,000 pieces, Film capacitors 500-5,000 pieces, Supercapacitors 100-1,000 pieces. As an authorized distributor, we stock common parts for immediate delivery and can support smaller quantities. For high-volume production, contact our sales team for pricing and scheduling.
4. Where can I get samples of HJC capacitors?
Samples of HJC capacitors are available through our authorized distributor network. You can request samples by contacting our sales team or through our website. Sample kits are available for each product family including MLCCs, electrolytics, film capacitors, and supercapacitors. Typical sample delivery time is 1-2 weeks depending on location and part availability.
5. Does HJC provide Spice models for simulation?
Yes, HJC provides Spice models for many of our capacitor products. These models include equivalent series resistance (ESR), equivalent series inductance (ESL), and capacitance values across frequency and temperature. Models are available for MLCCs, aluminum electrolytics, and film capacitors. Contact hjc's technical support team for application-specific design guidance and recommendations.