Electronics Reference

Key information in your hand

Free · In-App Purchases · Designed for iPad. Not verified for macOS.

Your shareware reference for resistors, capacitors, transistors, ICs, and microcontrollers. Identify components with your camera. Designed for makers and engineers. Electronics Component Reference is a beautifully crafted reference app for anyone who works with electronic components - from hobbyists building their first circuit to engineers at the bench. WHAT'S INSIDE • Resistors - Interactive color band calculator with common values and a visual guide to reading 4, 5, and 6-band resistors. • Capacitors - Decode ceramic capacitor markings, explore types, and look up values instantly. • Semiconductors - Reference cards for popular transistors and diodes, with a guide to PN junctions, BJTs, MOSFETs, and more. • Integrated Circuits - Browse a library of common ICs and the complete 74-series logic family, with pinouts and a family comparison guide (HC, LS, AC, LVC). • Microcontrollers - Specs and details for popular chips across ARM, AVR, and Xtensa architectures. • Boards - Pinout diagrams and GPIO references for Raspberry Pi 5 & 4, Pico, Arduino Uno & Nano, and ESP32. • Identify - Point your camera at a component and use OCR to identify ICs, capacitors, and microcontrollers from their markings. No ads, no account required, no internet needed.

Ratings & Reviews

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What's New Component Substitutes Transistor and diode detail pages now show related parts — equivalents, complements, and same-family alternatives — so you can find a substitute when a specific part isn't available. Capacitor Reference Overhaul The capacitor table now shows pF, nF, and µF side by side in every row, making it easy to compare values across units at a glance. Coverage extended to include the full E12 series and large values up to 1000 µF. New IC Entries Memory and Microcontroller IC categories are now populated. New entries include AT28C256 (parallel EEPROM), 24LC256 (I²C EEPROM), ATmega328P (Arduino Uno), and ATtiny85. RP2040 & ESP32 Pinouts Both chips now have full GPIO reference tables with alternate function annotations (SPI, I²C, UART, PWM, ADC, DAC). They no longer show a misleading DIP chip diagram — QFN chips display a scrollable pin list instead. Data Corrections 1N5408 and 1N5822 package corrected to DO-27 (not DO-41). IGBT detail now correctly shows VCE(sat) instead of hFE. Bug Fix The Identify screen no longer briefly shows "No results" before analysis has completed.

Version 1.1

The developer, John Kennedy, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

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    Information

    Seller
    • John Kennedy
    Size
    • 19.5 MB
    Category
    • Reference
    Compatibility
    Requires iOS 18.6 or later.
    • iPhone
      Requires iOS 18.6 or later.
    • iPad
      Requires iPadOS 18.6 or later.
    • Mac
      Requires macOS 15.6 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.6 or later.
    Languages
    • English
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © 2026 John Kennedy
  • Privacy Policy

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