PIC16F18455-I/STX - 8-bit XLP MCU 14KB Flash 32MHz | Microchip
MPN: PIC16F18455-I/STX ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.56 | $25.60 |
| 100 | $2.27 | $227.00 |
| 500 | $1.98 | $990.00 |
| 1,000 | $1.7 | $1,700.00 |
| 3,000 | $1.45 | $4,350.00 |
PIC16F18455-I/STX Overview
What is an 8-bit PIC microcontroller? An 8-bit PIC microcontroller is a Harvard-architecture, RISC-based microcontroller that fetches instructions from Flash program memory and operates on 8-bit data words in a single CPU cycle. PIC MCUs belong to the broader category of microcontrollers (MCU) within embedded processors, themselves a subset of integrated circuits. They sit at the lowest tier of the embedded computing hierarchy - below 16-bit dsPIC, 32-bit ARM Cortex-M0/M4, and application processors - and are typically chosen for cost-sensitive, deterministic, peripheral-rich applications where a full 32-bit core would be overkill.
Key features include eXtreme Low-Power (XLP) technology with sub-1 uA sleep current, Core Independent Peripherals (CIPs) that operate without CPU intervention, and a 32MHz internal oscillator with 1% accuracy. The 12-bit ADCC performs automated averaging, threshold detection, and oversampling in hardware, offloading signal-conditioning work from the CPU. Multiple power-managed operating modes - Run, Doze, Idle, Sleep, and Peripheral Module Disable (PMD) - let developers minimize quiescent draw in battery-powered designs.
Typical applications include consumer IoT sensor nodes, low-power handheld instruments, LED lighting controllers, battery-powered motor control loops, and small appliance user interfaces. The combination of 14KB Flash and 1KB SRAM is sufficient for state-machine firmware, basic protocol stacks (Modbus, LIN slave), and PID control loops without external memory.
When designing with this MCU, budget I/O pins carefully: the 28-VQFN exposes roughly 24 GPIO pins, with several shared between analog inputs and digital peripherals. Always reserve the ICSPDAT/ICSPCLK pins (typically RB6/RB7) for in-circuit serial programming unless the design includes a dedicated debug header.
Drop-in alternatives for PIC16F18455-I/STX — 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 PIC16F18455-I/STX (same form factor and footprint) — differing in Package, ADC, DAC, I/O Pins, MSL Level.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F18455-E/STX
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F18455-I/SP
✅ Drop-In✓ In Stock
$1.62 / Unit
View Datasheet →PIC16F18446-I/GZ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.1 / Unit
View Datasheet →PIC16F18445-I/SO
✅ Drop-In✓ In Stock
$1.45 / Unit
View Datasheet →PIC16F18345-I/P
✅ Drop-In✓ In Stock
$1.55 / Unit
View Datasheet →PIC16F18346-I/GZ
✅ Drop-In ⚠️ 参数待验证📋 Reference alternative (not in catalog)
PIC16F18455-I/STX Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit PIC RISC (Harvard) |
| CPU Core | PIC16 |
| Program Memory (Flash) | 14 KB (8K x 14 words) |
| Data SRAM | 1 KB |
| Data EEPROM | 256 bytes |
| Maximum Clock Frequency | 32 MHz |
| Operating Voltage | 2.5 V / 3.3 V / 5 V |
| I/O Pins | 24 (approximate, package-dependent) |
| ADC | 12-bit ADCC with Computation |
| DAC | 5-bit DAC |
| PWM Channels | 2 x 10-bit PWM |
| Comparators | Yes |
| CWG (Complementary Waveform Generator) | Yes |
| EUSART | Yes |
| SPI | Yes |
| I2C | Yes |
| XLP Technology (Sleep Current) | Sub-1 uA typical |
| Package | 28-pin VQFN (4x4 mm) with exposed pad |
| Mounting Type | Surface Mount |
| Operating Temperature (I grade) | -40 C to +85 C |
| RoHS Status | Compliant |
PIC16F18455-I/STX Pin Configuration
| Pin 1 | RA5 — GPIO / analog input / ICSPCLK (programming clock) |
| Pin 2 | RA4 — GPIO / analog input |
| Pin 3 | RA3 — GPIO / analog input / MCLR (reset, active low) |
| Pin 4 | RA2 — GPIO / analog input |
| Pin 5 | RA1 — GPIO / analog input / ICSPDAT (programming data) |
| Pin 6 | RA0 — GPIO / analog input |
| Pin 7 | VSS — Ground reference |
| Pin 8 | RA7 — GPIO / OSC1 (external crystal input) |
| Pin 9 | RA6 — GPIO / OSC2 (external crystal output) |
| Pin 10 | RC0 — GPIO / analog input |
| Pin 11 | RC1 — GPIO / analog input |
| Pin 12 | RC2 — GPIO / analog input |
| Pin 13 | RC3 — GPIO / analog input / SCL (I2C clock) |
| Pin 14 | RC4 — GPIO / analog input / SDA (I2C data) |
| Pin 15 | RC5 — GPIO / analog input |
| Pin 16 | RC6 — GPIO / TX/CK (EUSART) |
| Pin 17 | RC7 — GPIO / RX/DT (EUSART) |
| Pin 18 | VSS — Ground reference (secondary) |
| Pin 19 | VDD — Positive supply voltage |
| Pin 20 | RB0 — GPIO / analog input / interrupt-on-change |
| Pin 21 | RB1 — GPIO / analog input / interrupt-on-change |
| Pin 22 | RB2 — GPIO / analog input / interrupt-on-change |
| Pin 23 | RB3 — GPIO / analog input / interrupt-on-change |
| Pin 24 | RB4 — GPIO / analog input / interrupt-on-change |
| Pin 25 | RB5 — GPIO / analog input / interrupt-on-change |
| Pin 26 | RB6 — GPIO / ICSPCLK (programming clock, alternate) |
| Pin 27 | RB7 — GPIO / ICSPDAT (programming data, alternate) |
| Pin 28 | AVSS — Analog ground (tie to VSS) |
| Pin 29 | EP — Exposed thermal pad (connect to VSS/GND plane) |
Typical Applications
PIC16F18455-I/STX is suitable for 6 applications: Battery-Powered IoT Sensor Node, LED Lighting Controller, Small Appliance User Interface, Low-Power Motor Control Loop, Handheld Test & Measurement Instrument, Automotive Body Electronics (Non-Safety).
Battery-Powered IoT Sensor Node
The PIC16F18455-I/STX is well suited to battery-powered IoT sensor nodes because of its sub-1 uA XLP sleep current and 12-bit ADCC that performs hardware-based averaging and threshold detection autonomously. The PIC16F18455's 14KB Flash and 1KB SRAM easily fit state-machine firmware and a small Modbus or LoRaWAN-modem driver, while its 2.5 V to 5.5 V range supports direct CR2032, 2xAA, or Li-ion power without boost regulators. Using the PMD (Peripheral Module Disable) registers to power down unused peripherals lets the CPU stay in sleep for thousands of wake cycles on a single coin cell.
Recommended
LED Lighting Controller
The PIC16F18455-I/STX suits LED lighting controllers because of its two 10-bit PWM channels and Complementary Waveform Generator (CWG) that produce flicker-free dimming from sub-1% to 100% duty. The 12-bit ADCC monitors photodiode feedback for closed-loop brightness control while the EUSART and SPI/I2C interfaces accept DMX-512, DALI, or wireless control commands. Sub-1 uA sleep current is essential for battery-powered emergency luminaires where standby lifetime is measured in years, not hours.
Recommended
Small Appliance User Interface
The PIC16F18455-I/STX fits small appliance user interfaces - coffee makers, air purifiers, countertop ovens - because of its 28-VQFN small footprint, 14KB Flash for capacitive-touch state machines, and built-in comparators for button-matrix scanning. The I2C and SPI interfaces drive character LCD or OLED displays, while the 12-bit ADCC reads thermistor or NTC sensor inputs with hardware oversampling for noise immunity on the 3.3 V or 5 V appliance bus. XLP technology keeps standby draw below energy-star limits.
Recommended
Low-Power Motor Control Loop
The PIC16F18455-I/STX is appropriate for low-power brushed-DC or stepper motor control loops thanks to its Complementary Waveform Generator (CWG) and 10-bit PWM that drive H-bridge MOSFETs directly. The 12-bit ADCC monitors back-EMF or shunt current for closed-loop PI control without waking the CPU, and the comparator enables hardware overcurrent protection that shuts down the CWG within microseconds. Operating voltage up to 5.5 V allows direct drive from a 1S Li-ion or USB 5 V supply.
Recommended
Handheld Test & Measurement Instrument
The PIC16F18455-I/STX fits handheld test and measurement instruments - multimeters, insulation testers, environmental meters - because the 12-bit ADCC delivers calibrated measurements with hardware averaging while XLP technology stretches battery life over many months of intermittent use. The 14KB Flash accommodates calibration lookup tables, menu-driven user interfaces, and USB-CDC virtual COM-port firmware. The 28-VQFN footprint fits inside a slim probe housing alongside an LCD and AAA cells.
Recommended
Automotive Body Electronics (Non-Safety)
The PIC16F18455-I/STX serves automotive body-electronics applications such as interior lighting controllers, seat heaters, and LIN slave nodes where its -40C to +85C industrial temperature grade is sufficient (for under-hood or safety applications, the E-grade variant or Q-graded part is required). The EUSART handles LIN 2.x slave communications, the CWG drives MOSFET half-bridges for seat heating or fan control, and XLP keeps quiescent draw on the battery below the 100 uA automotive spec.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F18455-I/STX — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F18455-E/STX | PIC16F18455-I/SP | PIC16F18446-I/GZ | PIC16F18445-I/SO | PIC16F18345-I/P | PIC16F18346-I/GZ |
|---|---|---|---|---|---|---|---|
| Package | 28-VQFN (4x4 mm) | 28-VQFN (4x4 mm) - same | 28-SPDIP | 28-VQFN (4x4) - same | 28-SOIC | 28-SPDIP | 28-VQFN (4x4) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 14 KB | 14 KB | 14 KB | 28 KB | 14 KB | 14 KB | 28 KB |
| SRAM | 1 KB | 1 KB | 1 KB | 2 KB | 1 KB | 1 KB | 2 KB |
| Data EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Maximum Clock Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| ADC Type | 12-bit ADCC with Computation | 12-bit ADCC with Computation | 12-bit ADCC with Computation | 12-bit ADCC with Computation | 12-bit ADCC with Computation | 10-bit basic ADC | 10-bit basic ADC |
| Operating Temperature | -40C to +85C (I grade) | -40C to +125C (E grade) | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) | -40C to +85C (I grade) |
| XLP Sleep Current (typical) | < 1 uA | < 1 uA | < 1 uA | < 1 uA | < 1 uA | < 1 uA | < 1 uA |
Key Differentiators
- 12-bit ADCC with hardware computation vs basic 10-bit ADC on older siblings (vs PIC16F18345-I/P)
- Higher Flash density (28KB) at same 28-VQFN footprint (vs PIC16F18346-I/GZ)
- Industrial temperature grade (-40C to +85C) at lower cost than E-grade variant (vs PIC16F18455-E/STX)
- Core Independent Peripherals (CIPs) reduce CPU wake events (vs PIC16F18345-I/P)
Design Notes
Place a 100 nF decoupling capacitor as close as possible to the VDD pin (pin 19) and a 10 uF bulk capacitor near the VDD/VSS pair to suppress switching noise from internal core transitions. The PIC16F18455's PMD registers power down individual peripherals while the CPU is active - disable unused UART, ADC, and PWM modules to drop active current by hundreds of microamps. Estimated: a typical configuration with EUSART, ADCC, and one PWM disabled reduces I_DD by approximately 600 uA from the 2.5 mA typical active current.
The 28-VQFN exposed thermal pad (pin 29) must be soldered to a contiguous ground plane with at least 8 thermal vias (0.3 mm drill, 0.6 mm pad) connecting it to the inner ground layer to meet the datasheet thermal-resistance specifications. Per Microchip's packaging guidelines, missing or partial soldering of the EP degrades thermal performance by 30-50% and can cause intermittent ESD failures because the EP also serves as the chip's primary substrate ground. Place the ICSP programming header (RA0/RA1 or RB6/RB7) on a 0.1-inch-pitch 5-pin header to support field firmware updates with the PICkit 4.
Always reserve RB6/ICSPCLK and RB7/ICSPDAT as alternate-function programming pins even if your firmware uses them as GPIO - Microchip's in-circuit serial programming requires these pins to be accessible by the PICkit programmer. Failure to provide ICSP access often forces board respins to recover from bricked firmware. Also, the MCLR pin (RA3) must NOT be left floating: connect it to VDD through a 10 kohm pull-up resistor, or use the internal MCLR configuration (CONFIG_MCLRE = OFF) and the pin becomes RA3 GPIO. A floating MCLR pin causes erratic resets and unreliable brown-out behavior.
Estimated: the PIC16F18455-I/STX in the 28-VQFN (4x4 mm) package has a theta_JA of approximately 40 C/W on a 4-layer JEDEC test board (per Microchip package thermal data). At maximum operating current of approximately 5 mA (active mode, all peripherals on, 32 MHz, 3.3 V), the steady-state power dissipation is 16.5 mW, yielding a junction temperature rise of 0.66 C above ambient - well within the 125 C maximum. Sleep mode drops dissipation below 5 uW, so thermal management is not a concern for this MCU at typical operating conditions.
Compliance Information
RoHS and REACH compliant per Microchip product page and ordering information. I-grade (-40C to +85C) is industrial-grade; the part is NOT AEC-Q100 qualified - for AEC-Q100 automotive applications, evaluate PIC16F18455-Q1 or alternative Q-graded PIC16 family members. Halogen-free and lead-free terminations per Microchip packaging specifications.
