PIC16F18455-I/SO - 8-bit 32MHz 14KB Flash MCU | Microchip
MPN: PIC16F18455-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.17 | $2.17 |
| 10 | $1.95 | $19.50 |
| 100 | $1.74 | $174.00 |
| 500 | $1.55 | $775.00 |
| 1,000 | $1.38 | $1,380.00 |
PIC16F18455-I/SO Overview
An 8-bit microcontroller (MCU) is a small, low-power programmable processor built around an 8-bit data path, optimized for embedded control rather than raw computational throughput. The PIC16F18455 belongs to the broader class of microcontrollers within the semiconductor hierarchy: MCU -> embedded processor -> integrated circuit. It uses Microchip's enhanced mid-range 16-bit instruction set running on an 8-bit data bus, giving deterministic execution and very low power draw suitable for battery-powered edge devices.
Key features include eXtreme Low-Power (XLP) technology with currents in the nanoamp range in sleep, Core Independent Peripherals (CIPs) such as CWG, NCO, DSM and configurable logic cells, Memory Access Partitioning (MAP) for bootloader support, and a Device Information Area (DIA) for unique serialization. The 12-bit ADC2 performs automated averaging, filtering and threshold comparisons without CPU intervention.
Typical applications include low-power IoT sensor nodes, battery-powered HVAC and thermostat controls, automotive interior lighting and body controllers, consumer appliances, and general-purpose logic replacement. The wide 1.8V to 5.5V operating range and rich peripheral set let one part cover analog sensing, PWM-driven loads and serial communication in a single device.
When designing with this part, ensure decoupling capacitors are placed within a few millimeters of VDD/VSS pins and that the ICSP programming footprint is retained on production boards to allow in-field firmware updates. The 28-SOIC wide package (7.50 mm body) is the most serviceable hand-solder option for prototype runs.
Drop-in alternatives for PIC16F18455-I/SO — 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/SO (same form factor and footprint) — differing in Package, ADC, DAC, MSL Level, PWM Channels.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F18455-E/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.55 / Unit
View Datasheet →PIC16F18446-I/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.08 / Unit
View Datasheet →PIC16F18444-I/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$0.68 / Unit
View Datasheet →PIC16F18445-I/SO
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$1.45 / Unit
View Datasheet →PIC16F18345-I/SO
✅ Drop-In✓ In Stock
$1.28 / Unit
View Datasheet →PIC16F18455-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit enhanced mid-range |
| Program Memory (Flash) | 14 KB (8K x 14 words) |
| Data RAM | 1 KB |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 32 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V |
| Package | 28-pin SOIC wide (SO) |
| Mounting Type | Surface Mount |
| Temperature Grade | Industrial (-40C to +85C) |
| Low-Power Technology | XLP (eXtreme Low-Power) |
| Core Independent Peripherals | CWG, NCO, DSM, Configurable Logic Cells |
| Communication Peripherals | UART, SPI, I2C |
| MSL Level | 1 (unlimited) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC16F18455-I/SO Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O / analog channel / ICSP data |
| Pin 2 | RA3 — Bidirectional I/O / analog channel / ICSP clock |
| Pin 3 | RA4 — Bidirectional I/O / analog channel |
| Pin 4 | RA5 — Bidirectional I/O / analog channel |
| Pin 5 | RA6 — Bidirectional I/O / oscillator |
| Pin 6 | RA7 — Bidirectional I/O / oscillator |
| Pin 7 | VSS — Ground reference |
| Pin 8 | VDD — Positive supply voltage |
| Pin 9 | RA1 — Bidirectional I/O / analog channel |
| Pin 10 | RA0 — Bidirectional I/O / analog channel |
| Pin 11 | RC7 — Bidirectional I/O / EUSART RX |
| Pin 12 | RC6 — Bidirectional I/O / EUSART TX |
| Pin 13 | RC5 — Bidirectional I/O / I2C SCL |
| Pin 14 | RC4 — Bidirectional I/O / I2C SDA |
| Pin 15 | RC3 — Bidirectional I/O / SPI SCK |
| Pin 16 | RC2 — Bidirectional I/O / SPI SDO |
| Pin 17 | RC1 — Bidirectional I/O / SPI SDI |
| Pin 18 | RC0 — Bidirectional I/O |
| Pin 19 | RB7 — Bidirectional I/O / ICSP data |
| Pin 20 | RB6 — Bidirectional I/O / ICSP clock |
| Pin 21 | RB5 — Bidirectional I/O |
| Pin 22 | RB4 — Bidirectional I/O |
| Pin 23 | RB3 — Bidirectional I/O |
| Pin 24 | RB2 — Bidirectional I/O |
| Pin 25 | RB1 — Bidirectional I/O |
| Pin 26 | RB0 — Bidirectional I/O / interrupt |
| Pin 27 | VSS — Ground reference (second) |
| Pin 28 | VDD — Positive supply (second) |
Typical Applications
PIC16F18455-I/SO is suitable for 6 applications: Battery-Powered IoT Sensor Node, Automotive Interior Body Controller, Consumer Appliance Control Board, HVAC Thermostat and Climate Sensor, LED Lighting Driver Controller, Industrial Sensor Transmitter.
Battery-Powered IoT Sensor Node
The PIC16F18455-I/SO is well-suited to battery-powered IoT sensor nodes thanks to its eXtreme Low-Power (XLP) sleep currents in the nanoamp range and 1.8 V to 5.5 V operating range. The 12-bit ADC2 with computation performs automated averaging and threshold comparison without waking the CPU, while the CWG/NCO/DSM CIPs handle pulse generation and signal conditioning autonomously. Place the MCU as the central node controller, wake on ADC threshold or interrupt, transmit via UART/SPI/I2C, and return to sleep. Compared to a 32-bit MCU, the PIC16F18455 extends coin-cell life by an order of magnitude in duty-cycled sensor applications.
Recommended
Automotive Interior Body Controller
For automotive interior lighting, mirror control and small body controllers, the PIC16F18455-I/SO delivers 32 MHz performance with 14 KB Flash and Core Independent Peripherals that handle PWM and timing without CPU load. The CWG generates complementary PWM for LED drivers, the NCO provides precise frequency synthesis for LIN-style signaling, and the 12-bit ADC2 reads multi-zone sensors. Operating from a 12 V bus regulated to 5 V or 3.3 V, it consumes only a few mA active. For under-hood or extreme-temperature zones, step up to PIC16F18455-E/SO (XAIPART Site MPN) qualified to -40C to +125C.
Recommended
Consumer Appliance Control Board
In washing machines, coffee makers, microwave ovens and small kitchen appliances, the PIC16F18455-I/SO serves as the central control MCU, driving relays via PWM, reading temperature and level sensors through the 12-bit ADC2, and handling UI keypads and LED/LCD indicators. The Memory Access Partitioning (MAP) feature supports secure bootloader-based firmware upgrades for late-stage product differentiation. The 28-SOIC wide package is hand-solder-friendly for prototype runs and reflow-compatible for volume SMT. Compared to older PIC16F877A designs, the 18455 adds CIPs that offload timing-critical tasks from the CPU.
Recommended
HVAC Thermostat and Climate Sensor
The PIC16F18455-I/SO is a strong fit for HVAC wall thermostats and climate sensors because its 12-bit ADC2 with computation digitizes NTC thermistors with hardware averaging, and its CWG/NCO peripherals generate precise PWM outputs to drive TRIACs or solid-state relays for HVAC actuators. XLP nanoamp sleep allows the thermostat to run for years on two AA cells when paired with an interrupt-driven temperature sampling loop. The 1.8 V minimum VDD supports direct Li-ion or 2x AA power, eliminating boost converters. For connected thermostats with BLE/Wi-Fi co-processors, the 14 KB Flash hosts application and OTA bootloader partitions.
Recommended
LED Lighting Driver Controller
For architectural, signage and decorative LED lighting, the PIC16F18455-I/SO leverages its Complementary Waveform Generator (CWG) to produce hardware-timed PWM for multi-channel LED dimming without CPU intervention. The Data Signal Modulator (DSM) modulates data onto PWM carriers for addressable LED strips such as WS2812B clones, and the Numerically Controlled Oscillator (NCO) generates fine frequency steps for color-mixing algorithms. The 1.8 V to 5.5 V range lets the same firmware operate from 3.3 V or 5 V LED rails. Compared to a 32-bit Cortex-M0, this PIC achieves equivalent lighting smoothness at lower cost and power.
Recommended
Industrial Sensor Transmitter
In 4-20 mA loop-powered or industrial field-sensor transmitters, the PIC16F18455-I/SO provides the ADC front-end, sensor linearization, and HART-style or IO-Link communication signal generation. The 12-bit ADC2 with computation handles ratiometric bridge sensor readings with hardware averaging and threshold detection, while the CWG/NCO/CIP chain generates the IO-Link wake-up pulse patterns. The industrial -40C to +85C temperature grade covers most process-plant environments. With only a few mA active current, the part fits within loop-powered budgets. For outdoor or explosion-proof enclosures, select PIC16F18455-E/SO (extended -40C to +125C).
Recommended
Recommended Products Summary
Engineering reference data for PIC16F18455-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F18455-E/SO | PIC16F18446-I/SO | PIC16F18444-I/SO | PIC16F18445-I/SO | PIC16F18345-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (SO) | 28-SOIC (SO) - same | 28-SOIC (SO) - same | 28-SOIC (SO) - same | 28-SOIC (SO) - same | 28-SOIC (SO) - same |
| Flash Memory | 14 KB | 14 KB | 28 KB | 7 KB | 14 KB | 8 KB |
| RAM | 1 KB | 1 KB | 2 KB | 512 B | 1 KB | 1 KB |
| EEPROM | 256 B | 256 B | 256 B | 256 B | 256 B | 256 B |
| Maximum CPU Speed | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Operating Voltage Range | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V | 1.8 V to 5.5 V |
| Temperature Grade | Industrial (-40C to +85C) | Extended (-40C to +125C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) |
Key Differentiators
- Larger 14 KB Flash with 12-bit ADC2 with computation (vs PIC16F18345-I/SO)
- Industrial temperature grade baseline with extended option (vs PIC16F18455-E/SO)
- Core Independent Peripherals (CIPs) reduce CPU load (vs PIC16F18444-I/SO)
Design Notes
Place a 100 nF decoupling capacitor within 5 mm of each VDD pin (pins 8 and 28) and a bulk 1 uF to 10 uF ceramic on the VDD rail. The PIC16F18455's XLP sleep current in the nanoamp range is sensitive to leakage; ensure all unused I/O pins are configured as outputs driving low or as inputs with the internal weak pull-up disabled. Avoid high-impedance floating I/O that can drift and create phantom current paths in sleep mode.
The 28-SOIC wide package (SO, 7.50 mm body) is often confused with the 28-SSOP (5.30 mm body) and the 28-SPDIP (P) packages - they have identical pinouts but different land patterns and cannot be substituted without PCB rework. Verify the -SO versus -SS versus -P suffix carefully before ordering footprints. The 28-SOIC uses 1.27 mm pitch gull-wing leads while the 28-SPDIP uses 2.54 mm pitch through-hole leads.
Retain the ICSP footprint (PGED1/PGEC1 on RB7/RB6 or alternate ICSP pins) on production boards to allow in-field firmware updates. Per Microchip datasheet DS40002038C section on programming, ICSP pins must be accessible without disturbing the rest of the circuit. Keep the ICSP connector trace length under 50 mm and avoid sharing these pins with high-current loads to prevent programming interference. Memory Access Partitioning (MAP) requires a bootloader-aware linker script in MPLAB X IDE.
For ADC2 accuracy, separate analog and digital VDD/VSS traces and place the AVdd/AVss pins with their own ferrite bead or pi-filter. Keep ADC traces short and away from PWM switching nodes such as the CWG outputs. Place a 100 nF + 1 uF + 10 uF capacitor stack on AVdd. Per Microchip datasheet section on ADC2, the 12-bit ADC achieves best performance with an input impedance below 10 kOhm - use an external op-amp buffer for high-impedance sensors.
Compliance Information
RoHS and REACH compliance per Microchip product page. Industrial temperature grade only; for AEC-Q100 automotive qualified variants consult Microchip automotive-grade PIC16 portfolio.
