Popular Power Electronics & SMPS Design Calculators Battery Life & Runtime Calculator (Capacity & Discharge) Estimate total battery runtime in hours and days based on battery capacity (mAh/Ah), load current draw, and discharge efficiency. Open Tool
Engineering Utility Tools & Converters Battery Pack Series-Parallel & Charge/Discharge Calculator (Wh / Ah) Calculate total battery pack voltage, capacity (Ah), energy (Wh), charge/discharge time, and C-rate for series-parallel (S/P) battery packs. Open Tool
Electronics Engineering Resources, Charts & Tables Battery Size Chart Browse standard battery sizes, dimensions, voltage ratings, capacities, and common applications for cylindrical, coin cell, button cell, AA, AAA, C, D, 9V, lithium, alkaline, rechargeable, and industrial batteries. Open Tool
Development Board Pinouts & GPIO Reference BeagleBoard Pinout Reference Find BeagleBoard pinouts instantly with this free BeagleBoard Pinout Reference. View GPIO layouts, power pins, communication interfaces, expansion headers, and pin configurations for BeagleBoard development platforms. Open Tool
Analog Electronics & Op-Amp Calculators BJT Cascode Amplifier Calculator Calculate BJT cascode amplifier gain, output resistance, input resistance, bandwidth, collector current, voltage gain, and transistor operating parameters for high-frequency analog circuit design. Open Tool
Analog Electronics & Op-Amp Calculators BJT Transistor Bias Voltage Calculator Calculate BJT transistor bias voltage, base voltage, emitter voltage, collector voltage, resistor values, operating point, and transistor bias network parameters. Open Tool
Analog Electronics & Op-Amp Calculators BJT Transistor Switch Saturation Calculator Calculate BJT transistor switch saturation using collector current, base current, base resistor, forced beta, VCE(sat), and switching parameters for reliable transistor switch design. Open Tool
Popular Active Component & Semiconductor Calculators BJT Transistor Switch Saturation Calculator (Base Drive & Forced Beta) Calculate required base current (Ib), base resistor (Rb), and forced beta (βforced) to drive BJT transistors into deep hard saturation switching. Open Tool
RF & Microwave Engineering Calculators Bridged-Tee Attenuator Calculator (50Ω / 75Ω RF Impedance) Calculate series and shunt resistor values for bridged-tee RF attenuators maintaining constant characteristic impedance (Z0). Open Tool
PCB Design & Trace Calculators (IPC Standards) Broadside-Coupled Stripline Impedance Calculator (Differential) Compute differential and common-mode impedance for vertically broadside-coupled striplines on adjacent layers in multilayer PCBs. Open Tool
PCB Design & Trace Calculators (IPC Standards) Broadside-Coupled Trace Inductance Calculator (Multilayer) Calculate self and mutual inductance for vertically overlapping broadside-coupled traces on adjacent internal PCB laminate layers. Open Tool
Cable, Wire Gauge & Voltage Drop Calculators Cable Length at 3dB Treble Attenuation Calculator (Audio & RF) Calculate maximum allowable cable length before suffering -3dB high-frequency treble attenuation based on source impedance and capacitance. Open Tool
Cable, Wire Gauge & Voltage Drop Calculators Cable Treble Cutoff Frequency (Fc) Calculator (Low-Pass Filter) Calculate high-frequency -3dB cutoff frequency (Fc) caused by cable parasitic capacitance and source output impedance acting as a low-pass filter. Open Tool
RF & Microwave Engineering Calculators Capacitive Reactance & Admittance Calculator (Xc & Bc / IEEE) Calculate capacitive reactance (Xc), susceptance/admittance (Bc), and impedance from capacitance and operating AC frequency. Open Tool
Electronics Engineering Resources, Charts & Tables Capacitor Codes and Values Chart Decode ceramic, electrolytic, film, tantalum, polyester, mica, and SMD capacitor codes with capacitance values, tolerance, voltage ratings, and marking standards for electronics design and repair. Open Tool
Passive Component Calculators (RLC Circuits) Capacitor Impedance & Reactance Calculator (Xc & ESR / AC) Calculate total complex impedance (Z), capacitive reactance (Xc), and self-resonant frequency (SRF) of capacitors across AC frequencies. Open Tool
Engineering Utility Tools & Converters Capacitor Stored Energy & Charge Calculator (Joules / 0.5*C*V²) Calculate stored electrical energy (Joules / Watt-seconds) and total charge (Coulombs) in a capacitor from capacitance and voltage. Open Tool
Connector Pinouts & Wiring Diagrams Car Connector Pinout Reference Find automotive connector pinouts instantly with this free Car Connector Pinout Reference. View vehicle connector pin configurations, wiring layouts, signal assignments, ECU connections, OBD pinouts, and automotive electrical references for repair, diagnostics, engineering, and education. Open Tool
Analog Electronics & Op-Amp Calculators Cascaded IP3 Calculator Calculate cascaded IP3 (Third-Order Intercept Point), OIP3, IIP3, gain, nonlinear distortion, and overall linearity for RF and analog communication systems. Open Tool
RF & Microwave Engineering Calculators Cascaded Noise Figure & IP3 Calculator (Friis Formula for Noise) Calculate total cascaded noise figure, overall gain, and system noise temperature for multi-stage RF receiver front-ends using Friis' formula. Open Tool
Electronic Color Code Calculators & Charts Ceramic Capacitor Code Calculator (EIA / IEC 3-Digit) Decode 3-digit EIA/IEC ceramic disc capacitor markings into picofarads (pF), nanofarads (nF), and microfarads (µF) with tolerance ratings. Open Tool
Electronic Color Code Calculators & Charts Ceramic Capacitor Color Code & Temperature Coefficient (Class 1 & 2) Decode ceramic capacitor color bands for capacitance, tolerance, and Class 1/Class 2 temperature coefficients (NP0, C0G, X7R, Y5V) per EIA standards. Open Tool
Electronic Color Code Calculators & Charts Ceramic Capacitor Color Code with Voltage Rating (EIA-RS-198) Identify capacitance value, tolerance percentage, and rated DC working voltage from color bands on ceramic disc capacitors per EIA-RS-198. Open Tool
Electronic Component Packages & Footprint Guide Ceramic Pin Grid Array (CPGA) Ceramic Pin Grid Array (CPGA) package guide with pin layout, package dimensions, thermal performance, applications, PCB mounting, and semiconductor package reference. Open Tool
Electronic Component Packages & Footprint Guide Ceramic Quad Flat Pack (CQFP) Ceramic Quad Flat Pack (CQFP) package guide with dimensions, pin configuration, thermal characteristics, applications, advantages, and electronic package reference. Open Tool
RF & Microwave Engineering Calculators Circular Waveguide Calculator (Cutoff Frequency & Modes / IEEE) Calculate cutoff frequencies, guide wavelength, phase velocity, and propagation modes (TE11, TM01) for circular waveguides per IEEE standards. Open Tool
Popular RF & Microwave Engineering Calculators Coaxial Cable Impedance Calculator (IEC 61196 / MIL-C-17) Calculate characteristic impedance (Z0), cut-off frequency, and propagation delay for coaxial cables per IEC 61196 and MIL-C-17. Open Tool
RF & Microwave Engineering Calculators Coaxial Cable Inductance & Capacitance Calculator (Per Unit Length) Calculate distributed self-inductance (nH/m) and capacitance (pF/m) per unit length for coaxial transmission lines. Open Tool
Passive Component Calculators (RLC Circuits) Coil Physical Properties Calculator (Length, Turns & Weight) Calculate total wire length, coil winding resistance, total weight, and dimensions for air-core and magnetic-core inductor coils. Open Tool
Electronics Engineering Resources, Charts & Tables Coin Cell Battery Chart Browse standard coin cell battery sizes, dimensions, voltage ratings, capacities, chemistry types, IEC designations, and equivalent replacements for electronics, watches, calculators, sensors, and medical devices. Open Tool