Precision NPO Ceramic Capacitor for RF Applications
The Motorola 2111078B27 is a surface mount ceramic chip capacitor specifically selected for radio frequency applications in Motorola two-way radio circuits. This component features a rated capacitance of 30 picofarads (30pF / 30 pF) with 5% tolerance and 100 volt (100V / 100 VDC) working voltage rating. The NPO dielectric (also known as C0G) provides exceptional temperature stability and low loss characteristics essential for RF tuning, coupling, and oscillator circuits. The compact surface mount package with silvered end terminations ensures reliable soldering and excellent high-frequency performance.
Key Features
- Genuine Motorola OEM component ensures exact specifications for radio circuit performance
- NPO (C0G) Class I dielectric provides superior temperature stability and minimal capacitance drift
- 30pF (30 pF) capacitance value ideal for RF tuning, coupling, and impedance matching applications
- 5% tolerance ensures predictable circuit performance in frequency-critical applications
- 100V (100 VDC / 100 volt) working voltage rating suitable for RF power amplifier circuits
- Low loss tangent and high Q factor minimize signal degradation in RF paths
- Surface mount package enables high-density PCB layouts in modern radio designs
- Silvered end terminations provide excellent solderability and long-term reliability
Technical Specifications
- Component Type: Multi-Layer Ceramic Chip Capacitor (MLCC)
- Capacitance: 30pF (30 pF / 30 picofarad)
- Tolerance: ±5% (J tolerance)
- Rated Voltage: 100V DC (100VDC / 100 volt)
- Dielectric Type: NPO (C0G) - Class I ceramic
- Temperature Coefficient: 0±30 ppm/°C (NPO specification)
- Application: Radio Frequency (RF) circuits
- Mounting Style: Surface mount
- Termination: Silvered end caps
- Package Size: Standard SMD chip format
Compatible Radio Models
This component is used in various Motorola portable and mobile two-way radio models, particularly in RF stages including transmitter power amplifiers, receiver front-ends, and frequency synthesis circuits. Consult your radio's service manual or contact a Motorola authorized service center for specific compatibility information.
What's Included
- One (1) Motorola 2111078B27 NPO Ceramic Chip Capacitor 30pF 100V
Applications
- RF power amplifier coupling and bypass circuits
- Transmitter output matching networks and harmonic filtering
- Receiver front-end tuning and selectivity circuits
- VCO (Voltage Controlled Oscillator) frequency-determining circuits
- Impedance matching in antenna circuits
- RF signal path coupling where low loss is critical
Installation and Service Notes
Professional installation by qualified radio technicians with surface mount soldering experience is required. This NPO capacitor requires specialized equipment including a temperature-controlled soldering station, precision tweezers, fine solder wire or solder paste, flux, and magnification for inspection. The small capacitance value (30pF / 30 pF) makes this component particularly sensitive to parasitic capacitance, so proper PCB pad cleaning and minimal solder fillet size are essential to maintain circuit tuning accuracy.
Remove the original component using proper desoldering technique, applying controlled heat to both terminals simultaneously to avoid thermal shock to the PCB and nearby components. Clean the PCB pads thoroughly using flux and desoldering braid, ensuring completely flat, clean surfaces free of residual solder. Apply a minimal amount of flux to the pads. Position the new capacitor carefully, ensuring both end terminations make full contact with their respective pads. For hand soldering, use a fine conical tip at 350°C (662°F / 350 C) maximum temperature, touching each end briefly (1-2 seconds) to create small, neat solder fillets. Excessive solder can add parasitic capacitance and detune RF circuits.
After installation, inspect the solder joints under magnification to verify proper wetting to both the component and PCB pad, absence of cold solder joints, no solder bridges between adjacent pads, and minimal fillet size appropriate for the component. In RF circuits, even small installation variations can affect performance, so verification is critical. Test the radio's transmitter output power, frequency accuracy, and receiver sensitivity to confirm proper circuit operation. Use appropriate RF test equipment to verify the radio meets specifications after component replacement.
Replace this capacitor when troubleshooting RF performance issues including reduced transmit power, frequency drift, spurious emissions, degraded receiver sensitivity, or intermittent operation. NPO ceramic capacitors are highly stable but can fail due to voltage stress (especially in high-power transmitter circuits), mechanical stress causing internal cracks, or thermal cycling. Symptoms may include open circuit (loss of coupling or tuning), short circuit (causing DC paths in RF circuits), or partial degradation (reduced capacitance affecting frequency response and tuning). Always use genuine Motorola replacement parts to ensure proper capacitance tolerance, voltage rating, and NPO temperature characteristics that match original circuit design specifications.
Ideal for Motorola authorized service centers, professional two-way radio repair technicians, RF circuit specialists, and experienced electronics technicians performing component-level repair on Motorola radio equipment used in public safety, commercial, industrial, and land mobile radio applications.
Manufacturer Part Number: 2111078B27
Capacitance Value: 30pF (30 pF)
Voltage Rating: 100V DC (100VDC / 100 volt)
Dielectric Type: NPO (C0G)
Description: Chip Capacitor RF 30 5 Npo 100V
