High-Voltage X7R Ceramic Capacitor for Radio Power Supply Circuits
The Motorola 2113918B09 is a high-voltage ceramic chip capacitor designed for demanding power supply and coupling applications in Motorola two-way radio equipment. This component features 10,000 picofarads (0.01 microfarads) capacitance with an impressive 1000V DC voltage rating, making it suitable for high-voltage power supply filtering, RF power amplifier decoupling, and voltage multiplier circuits. The X7R dielectric provides stable capacitance across a wide temperature range with moderate temperature coefficient, balancing size constraints with performance requirements. The 10% tolerance ensures predictable circuit behavior while the high voltage rating provides safety margin in critical power circuits.
Key Features
- Genuine Motorola component ensures reliable performance in demanding applications
- 10,000pF (0.01µF / 10nF) capacitance suitable for power supply filtering and RF decoupling
- 1000V DC voltage rating handles high-voltage power supply and RF amplifier circuits
- X7R dielectric provides stable capacitance with ±15% variation over -55°C to +125°C range
- 10% capacitance tolerance (K rating) ensures predictable circuit performance
- High voltage rating provides safety margin and reliability in critical power applications
- Compact chip design despite high voltage rating enables space-efficient layouts
Technical Specifications
- Motorola Part Number: 2113918B09
- Component Type: Multilayer Ceramic Chip Capacitor (MLCC)
- Capacitance: 10,000 pF (10 nF / 0.01 µF)
- Tolerance: ±10% (K tolerance code)
- Rated Voltage: 1000V DC
- Dielectric Type: X7R - Class II High-Dielectric Ceramic
- Temperature Range: -55°C to +125°C
- Temperature Coefficient: ±15% capacitance change over full temperature range
- Dissipation Factor: Typically 2.5% maximum at 1 kHz
- Insulation Resistance: >10,000 MΩ or 100 GΩ-µF (whichever is less)
- Dielectric Strength: >2.5x rated voltage (2500V DC test voltage)
- Mounting Style: Surface mount or through-hole depending on package configuration
Compatible Radio Models
This component is used in various Motorola portable and mobile two-way radio models, particularly in high-voltage sections including switching power supplies, DC-DC converters, RF power amplifier decoupling circuits, high-voltage bias networks, and voltage multiplier stages. The 1000V rating indicates this capacitor is specified for circuits operating at elevated voltages where lower-rated capacitors would be inadequate or unsafe. Consult your radio's service manual or contact a Motorola authorized service center for specific compatibility and circuit location information.
What's Included
- One (1) Motorola 2113918B09 High-Voltage Ceramic Chip Capacitor
Applications
- High-voltage power supply filtering and ripple suppression
- RF power amplifier DC blocking and decoupling circuits
- Voltage multiplier and doubler circuit energy storage
- High-voltage bias network filtering for RF amplifiers
- Switching power supply input/output filtering
- DC-DC converter energy transfer and smoothing circuits
- High-voltage transient suppression and spike filtering
Installation and Service Notes
Professional installation by qualified radio technicians familiar with high-voltage circuits is mandatory. Working with capacitors rated at 1000V requires additional safety precautions beyond standard electronic repair work. Required tools include temperature-controlled soldering station with appropriate tip, precision handling tools (tweezers or pliers with insulated handles), appropriate solder (rosin-core, lead-free or 60/40 depending on application), no-clean flux, high-voltage insulated gloves for handling in energized circuits, magnification equipment for inspection, and high-voltage safety discharge tools. The work area must be ESD-protected and equipped with proper safety signage indicating high-voltage work in progress.
Before working on any circuit containing this capacitor, ensure the radio is powered off and disconnected from all power sources. High-voltage capacitors can retain charge for extended periods even after power removal. Use a proper high-voltage discharge tool (high-value resistor rated for the voltage, typically 1MΩ or higher) to safely discharge the capacitor before handling. Never short-circuit high-voltage capacitors directly, as the high discharge current can damage the component, circuit board, or cause personal injury. Verify zero voltage across the capacitor terminals using a high-voltage multimeter before proceeding with removal or installation.
Installation procedure varies by mounting style. For surface mount types: clean pads thoroughly with isopropyl alcohol, apply no-clean flux sparingly, position capacitor precisely ensuring proper orientation and adequate clearance from other components (high voltage requires greater spacing), solder one end first using minimal heat time (2-3 seconds maximum), allow cooling, then solder opposite end. For through-hole types: insert leads through appropriate holes, ensure component body is positioned at safe distance from PCB surface and adjacent components, bend leads slightly for mechanical retention, solder from component side creating proper fillet, and trim excess lead length. In all cases, maintain proper high-voltage clearances per IPC standards (minimum 3mm for 1000V applications in typical environments).
This capacitor is typically replaced during troubleshooting of power supply failures including excessive ripple voltage, inadequate power supply filtering, RF power amplifier instability or reduced output power, bias voltage fluctuations, or complete power supply failure. Visual inspection may reveal cracking, discoloration, or carbonization indicating dielectric breakdown. Electrical testing with a capacitance meter will reveal open or short-circuit conditions. In high-voltage switching circuits, capacitor failure can cause cascading damage to other components including rectifiers, voltage regulators, and RF power amplifier transistors. Always inspect associated components when replacing high-voltage capacitors.
After installation, comprehensive testing is required before returning the radio to service. Verify all high-voltage points are at correct operating voltages using a calibrated high-voltage multimeter. Check for proper power supply regulation, acceptable ripple voltage levels (typically <100mV peak-to-peak for radio power supplies), and stable operation under load. For RF power amplifier circuits, verify output power meets specification, bias voltages are correct and stable, and current consumption is within normal parameters. Use thermal imaging or temperature measurement to verify the new capacitor is not overheating during operation, which would indicate improper installation, inadequate voltage rating, or circuit problems.
Never substitute this component with capacitors having lower voltage ratings, even if they have identical capacitance values. Operating a capacitor above its voltage rating will cause premature dielectric breakdown, potentially resulting in catastrophic failure with smoke, fire hazard, or damage to expensive RF components. X7R dielectric is appropriate for this application, but do not substitute with Y5V or other Class 3 dielectrics that have poor temperature stability and voltage coefficients. Always use genuine Motorola parts or equivalent capacitors from reputable manufacturers (Murata, TDK, AVX, Kemet) with verified specifications matching voltage rating, capacitance, tolerance, and temperature characteristics.
This component is intended for service by Motorola authorized service centers, professional radio technicians with high-voltage safety training, and experienced electronics repair specialists. Due to the inherent hazards of working with high-voltage circuits (shock hazard, burn hazard from capacitor discharge), proper safety training and equipment are mandatory. High-voltage work should never be performed by untrained personnel or in inadequately equipped facilities.
Manufacturer Part Number: 2113918B09
Description: High-Voltage Ceramic Chip Capacitor, 10,000pF (0.01µF), 1000V DC, X7R, ±10%
Dielectric Type: X7R Class II High-Dielectric Ceramic
Voltage Rating: 1000V DC (High Voltage)
Safety Warning: High-voltage component - discharge before handling
Application: Power Supply Filtering, RF Amplifier Decoupling, High-Voltage Circuits
