PIC16F18857-I/ML - 56KB Flash 8-bit MCU, 32MHz, XLP | Microchip
MPN: PIC16F18857-I/ML β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.45 | $2.45 |
| 10 | $2.3 | $23.00 |
| 100 | $2.1 | $210.00 |
| 500 | $1.95 | $975.00 |
| 1,000 | $1.8 | $1,800.00 |
PIC16F18857-I/ML Overview
An 8-bit MCU in the Microchip PIC16 family uses a RISC Harvard-architecture core, providing deterministic instruction execution (most instructions in one instruction cycle) for predictable real-time behavior. The "16" in the prefix denotes the mid-range PIC16 architecture, which sits between the baseline PIC10/12/16 families and the high-performance PIC18/PIC24 families. These MCUs are widely used in industrial automation, IoT sensor nodes, automotive body electronics, and consumer devices where low power, robust peripherals, and easy in-circuit programmability outweigh the need for high clock speed.
Key differentiating specifications include 56KB Flash, 4KB SRAM, 256 bytes EEPROM, an integrated temperature indicator, multiple operating modes (Run, Doze, Idle, Sleep), and a 32MHz internal oscillator with PLL options. The device supports up to 25 analog channels (ADC), 36 digital I/O pins, and integrates 5 CCP (Capture/Compare/PWM) modules plus 3 ECCP (Enhanced CCP) for motor or power-conversion control. Functional safety features include a Windowed Watchdog Timer (WWDT), hardware CRC/SCAN, and a built-in self-test BIST that allows the device to satisfy IEC 60730 Class B safety requirements for home appliances.
Architecturally the PIC16F18857-I/ML uses a 14-bit instruction word Flash-based mid-range core with a 32MHz oscillator driving four clock phases per instruction cycle. The CIP blocks - Configurable Logic Cells (CLC), Numerically Controlled Oscillator (NCO), and Complementary Waveform Generator (CWG) - execute tasks without CPU intervention, freeing the core for application logic. Voltage regulator flexibility from 1.8V to 5.5V, with brown-out-reset (BOR) and low-power sleep modes, lets designers run from a single Li-ion coin cell or a regulated 3.3V supply.
Typical applications include IoT sensor nodes, battery-powered remote controls, home appliances with IEC 60730 Class B safety requirements, automotive body and interior modules, sensor interface boards, and low-cost motor-control designs. Pairing the device with an MCP2210 USB-to-SPI bridge or an external EEPROM is straightforward because the peripheral pin-select (PPS) remapping feature lets designers route digital functions to any available I/O.
When designing with this device, ensure that the Watchdog Timer window and BOR thresholds are configured in software using the __EEPROM bytes reserved in the configuration area, and confirm the QFN exposed pad is soldered to the ground plane for thermal dissipation. Using the MPLAB X IDE with the XC8 compiler in free/professional mode is recommended for full CIP-aware code generation and IEC 60730 safety library support.
This page synthesizes distributor inventory, real-time pricing across qty tiers, pin-compatible drop-in alternatives in the PIC16F1885X/7X family, and practical design notes that go beyond the manufacturer datasheet.
Drop-in alternatives for PIC16F18857-I/ML β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with PIC16F18857-I/ML (same form factor and footprint) β differing in ADC, Package, Program Memory (Flash), Core Architecture, Timers.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16F18855-I/ML
β Drop-Inβ In Stock
$1.38 / Unit
View Datasheet βPIC16F18856-I/ML
β Drop-Inπ Reference alternative (not in catalog)
PIC16F18857-E/ML
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PIC16F18857T-I/ML
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1.88 / Unit
View Datasheet βPIC16LF18857-I/ML
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PIC16F18857-I/ML Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16 8-bit RISC |
| Program Memory (Flash) | 56 KB (32K x 14 words) |
| Data SRAM | 4 KB |
| Data EEPROM | 256 B |
| Maximum CPU Frequency | 32 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Package | 28-QFN (6x6 mm) |
| Pin Count | 28 |
| Temperature Grade | -40C to +85C (Industrial, 'I' suffix) |
| Digital I/O Pins | Up to 36 (function-share limited) |
| ADC | 10-bit, multiple channels |
| Communication | EUSART, I2C, SPI |
| PWM / CCP | 5 CCP + 3 ECCP |
| Timers | Multiple 8/16-bit timers |
| Watchdog | Windowed Watchdog Timer (WWDT) |
| Low-Power Technology | eXtreme Low Power (XLP) |
| Functional Safety | FuSa support; IEC 60730 Class B |
| Cipher Type | Advanced (per family description) |
| Mounting Type | Surface Mount |
| RoHS | Compliant |
PIC16F18857-I/ML Pin Configuration
| Pin 1 | RA0/AN0 β Analog input 0 / GPIO |
| Pin 2 | RA1/AN1 β Analog input 1 / GPIO |
| Pin 3 | RA2/AN2 β Analog input 2 / GPIO |
| Pin 4 | RA3/AN3 β Analog input 3 / GPIO |
| Pin 5 | RA4 β GPIO / Timer0 clock |
| Pin 6 | RA5 β GPIO / I/O |
| Pin 7 | VSS β Ground |
| Pin 8 | RA7/OSC1 β GPIO / Crystal oscillator input |
| Pin 9 | RA6/OSC2 β GPIO / Crystal oscillator output |
| Pin 10 | RC0 β GPIO / I/O |
| Pin 11 | RC1 β GPIO / I/O |
| Pin 12 | RC2 β GPIO / I/O |
| Pin 13 | RC3 β GPIO / I/O |
| Pin 14 | RC4 β GPIO / I/O |
| Pin 15 | RC5 β GPIO / I/O |
| Pin 16 | RC6 β GPIO / I/O |
| Pin 17 | RC7 β GPIO / I/O |
| Pin 18 | RB7 β GPIO / I/O |
| Pin 19 | RB6 β GPIO / I/O |
| Pin 20 | RB5 β GPIO / I/O |
| Pin 21 | RB4 β GPIO / I/O |
| Pin 22 | RB3 β GPIO / I/O |
| Pin 23 | RB2 β GPIO / I/O |
| Pin 24 | RB1 β GPIO / I/O |
| Pin 25 | RB0 β GPIO / I/O |
| Pin 26 | VDD β Positive supply voltage |
| Pin 27 | RE3 β GPIO / I/O |
| Pin 28 | EP β Exposed thermal pad (ground) |
Typical Applications
PIC16F18857-I/ML is suitable for 6 applications: IoT Sensor Node (Battery-Powered), Home Appliance with IEC 60730 Class B, Automotive Body Electronics Interior Module, Remote Control and Human-Interface Device, Low-Voltage Sensor Interface Board, Low-Cost BLDC Motor Control.
IoT Sensor Node (Battery-Powered)
The PIC16F18857-I/ML suits IoT sensor nodes because its XLP technology drops the active current into the low-microampere range during sleep, giving multi-year coin-cell life. The 32MHz PIC16 core executes sensor reads and radio handshakes in well under 1ms, while 4KB of SRAM buffers 10-bit ADC readings between transmissions. Designers wire it to a sub-GHz radio like the MRF89XA or a BLE module via EUSART/SPI, and the WWDT plus IEC 60730 library keep the firmware safe during unattended operation.
Recommended
Home Appliance with IEC 60730 Class B
The PIC16F18857-I/ML carries Microchip's Functional Safety (FuSa) feature set, including the Windowed Watchdog Timer, hardware CRC/SCAN, and the IEC 60730 safety library, which lets household appliance designers certify washers, dryers, and dishwashers for Class B safety. The 56KB Flash holds the entire safety library plus application code without expensive external memory, while 4KB SRAM manages state machines and user-interface animations. The CWG and ECCP modules directly drive TRIAC-control logic for heating elements and motor switching.
Recommended
Automotive Body Electronics Interior Module
The PIC16F18857-I/ML (Industrial grade) handles interior lighting dimming, HVAC control panels, and mirror-position memory because its Core Independent Peripherals (CLC, NCO, CWG) offload bit-banged control logic to hardware, freeing the core for communication. The 36 I/O pins comfortably support RGB-LED arrays, keyscan matrices, and LIN-spy via the EUSART, while 10-bit ADC reading potentiometers and thermistors keeps BOM small. Pair the design with a TJA1027 LIN transceiver for chassis-side communication.
Recommended
Remote Control and Human-Interface Device
The PIC16F18857-I/ML drives low-cost RF remote controls, IR transmitters, and consumer HIDs because its XLP sleep current and Brown-Out Reset make coin-cell operation reliable. The on-chip CIP blocks - Complementary Waveform Generator (CWG) for IR, Configurable Logic Cells (CLC) for keystroke debouncing - let designers shrink code size and stay within the 56KB Flash budget. The 256-byte EEPROM stores pairing codes and user preferences across battery swaps, while the 4KB SRAM handles display frame buffers for OLED modules.
Recommended
Low-Voltage Sensor Interface Board
The PIC16F18857-I/ML powers sensor interface boards running from a regulated 1.8V-3.3V rail, taking advantage of its full 1.8V-5.5V supply range and ultra-low sleep current. Designers use the 10-bit ADC to read multiple sensors simultaneously via DMA-equivalent hardware accumulation, freeing the core for averaging and threshold detection. The EUSART/SCK/I2C serve as bridges to digital sensors (BME280, MPU-6050), while 256 bytes of EEPROM stores calibration constants. The 28-QFN footprint drops into ultra-compact boards.
Recommended
Low-Cost BLDC Motor Control
The PIC16F18857-I/ML's three Enhanced CCP (ECCP) modules with programmable dead-band and auto-shutdown directly drive BLDC motor half-bridges without an external gate driver. The 32MHz clock provides the 31.25 kHz PWM at 8-bit resolution needed for quiet commutation, while the 10-bit ADC samples back-EMF for sensorless operation. Designers save BOM cost by eliminating dedicated BLDC controllers and using the CWG for complementary high/low-side drive with hardware fault handling.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F18857-I/ML β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F18855-I/ML | PIC16F18856-I/ML | PIC16LF18857-I/ML | PIC16F18857-E/ML |
|---|---|---|---|---|---|
| Package | 28-QFN (6x6) | 28-QFN (6x6) - same | 28-QFN (6x6) - same | 28-QFN (6x6) - same | 28-QFN (6x6) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Flash Memory | 56 KB | 28 KB (-50%) | 28 KB (-50%) | 56 KB (0%) | 56 KB (0%) |
| Data SRAM | 4 KB | 2 KB (-50%) | 2 KB (-50%) | 4 KB (0%) | 4 KB (0%) |
| Data EEPROM | 256 B | 256 B (0%) | 256 B (0%) | 256 B (0%) | 256 B (0%) |
| Maximum CPU Frequency | 32 MHz | 32 MHz (0%) | 32 MHz (0%) | 32 MHz (0%) | 32 MHz (0%) |
| Operating Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V (0%) | 1.8 V to 5.5 V (0%) | 1.8 V to 5.5 V (0%) | 1.8 V to 5.5 V (0%) |
| Temperature Grade | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) |
| Unit Price (qty 1, USD) | 2.45 | ~2.10 | ~2.20 | ~2.50 | ~2.80 |
| Low-Power Technology | XLP | XLP (same) | XLP (same) | XLP enhanced (lower voltage) | XLP (same) |
Key Differentiators
- Highest memory density in the 28-QFN PIC16F1885X/7X family (vs PIC16F18855-I/ML)
- Functional Safety (FuSa) capable for IEC 60730 Class B (vs PIC16F18856-I/ML)
- Industrial temperature grade availability at modest premium (vs PIC16F18857-E/ML)
Design Notes
The 28-QFN (6x6) package dissipates modest heat because the exposed thermal pad (pin EP) is the only path to the die. Solder the EP to a continuous ground copper pour at least 100 mm^2 on the top layer and stitch with thermal vias to the inner ground plane. For a thermally demanding application such as driving multiple LED strings at 20mA per pin, derate total GPIO current to 8 mA across the device to keep the junction under 90C in a 65C enclosure.
Place a 100nF ceramic decoupling capacitor within 5 mm of the VDD pin and a 1uF bulk capacitor within 25 mm to suppress transients during BOR events. Keep the crystal traces (OSC1/OSC2) short and symmetric, surrounded by a ground guard; for higher-clock stability add a 4.7k-ohm parallel resistor across the crystal. Reserve the MCLR pin with a 10k pull-up and a 100nF capacitor to ground for in-circuit debugger support.
Do not leave unused I/O pins floating - configure them as outputs low or inputs with the internal weak pull-up enabled, otherwise they oscillate and increase supply current by hundreds of uA, negating the XLP benefit. Also remember that PPS-mapped outputs (peripheral pin select) must be unlocked via the PPSLOCK register before any change, and any locked mapping persists through reset until cleared.
For ultra-low sleep current (<1 uA typical), disable the ADC, disable unused peripherals individually, set all unused I/O to logic low, and select the internal LFINTOSC as the sleep clock source. According to the Microchip datasheet, leaving the ADC active in sleep can waste 200 uA, so power it down with ADC.CGOE = 0 before issuing the sleep instruction. Many application notes from Microchip show sub-uA standby designs using these techniques.
Compliance Information
RoHS compliant per Microchip product ordering information. Industrial temperature grade ('I' suffix). For AEC-Q100 qualified automotive parts, consult the PIC16F18857-E (extended) variant or the dedicated PIC16F18xxx automotive family.
