PIC16F18456-I/SO - 8-bit MCU, 32MHz, 28KB Flash, 28-SOIC | Microchip
MPN: PIC16F18456-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.66 | $26.60 |
| 100 | $2.36 | $236.00 |
| 500 | $2.12 | $1,060.00 |
| 1,000 | $1.89 | $1,890.00 |
| 3,000 | $1.72 | $5,160.00 |
PIC16F18456-I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, working RAM, and a rich set of peripherals on one die. Within the semiconductor taxonomy it sits inside the microcontroller family, which itself belongs to integrated circuits (ICs) and ultimately to the broader category of power-managed embedded computing devices. The PIC16F18456 combines this architectural simplicity with modern analog and digital peripherals, making it a step up from older PIC16F1xxx devices while preserving instruction-set and tool-chain compatibility.
Key differentiating features of the PIC16F18456 include a 12-bit ADC with up to 24 channels, a 5-bit DAC, two PWM modules, a comparator, a Complementary Waveform Generator (CWG), and dual EUSART plus dual SPI/I2C communication. It supports 28KB (16K x 14 words) of self-programmable FLASH, 2KB SRAM, and 256 bytes of EEPROM. The device operates from 1.8V to 5.5V and includes XLP idle/doze modes for battery-powered designs.
Technically, the PIC16F18456 uses a Harvard RISC architecture with a 14-bit instruction word, a hardware multiplier, and a vectored interrupt controller. The peripheral pin-select (PPS) routing allows most digital functions to be remapped to a wide range of I/O pins, simplifying PCB layout in space-constrained designs.
Typical applications include low-power IoT sensor nodes, consumer appliance control boards, automotive body electronics (non-safety), industrial sensor signal conditioning, LED lighting controllers, and USB-to-UART bridges using the EUSART.
When designing with this device, ensure the WDT is configured for your application's recovery latency and that the PPS mapping matches your board layout. The 28-SOIC package simplifies hand prototyping and rework compared to smaller QFN variants.
This page synthesizes verified distributor pricing, drop-in alternatives, and practical design notes that complement the official Microchip datasheet.
Drop-in alternatives for PIC16F18456-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 PIC16F18456-I/SO (same form factor and footprint) — differing in Package, ADC, Comparators, Core, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F18456-E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F18456T-I/SO
✅ Drop-In✓ In Stock
$0.98 / Unit
View Datasheet →PIC16F18455T-I/SO
✅ Drop-In✓ In Stock
$1.08 / Unit
View Datasheet →PIC16F18446T-I/SO
✅ Drop-In✓ In Stock
$0.6406 / Unit
View Datasheet →PIC16F18444T-I/SO
✅ Drop-In✓ In Stock
$0.55 / Unit
View Datasheet →PIC16F18345-I/SO
✅ Drop-In✓ In Stock
$1.28 / Unit
View Datasheet →PIC16F18456-I/SO Maximum Ratings & Electrical Characteristics
| Core | PIC16 8-bit RISC |
| CPU Architecture | Harvard, 14-bit instruction word |
| Maximum Clock Frequency | 32 MHz |
| Program Memory (FLASH) | 28 KB (16K x 14 words) |
| SRAM | 2 KB |
| EEPROM | 256 bytes |
| ADC | 12-bit, up to 24 channels |
| DAC | 5-bit, 1 channel |
| PWM Modules | 2 (10-bit, MCCP/SCCP) |
| Comparators | Yes (with DAC reference) |
| CWG | Complementary Waveform Generator |
| EUSART | 2 |
| SPI / I2C | 2 SPI / 2 I2C |
| Operating Voltage | 1.8 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 28-pin SOIC (SO), wide-body, 7.5 mm |
| Mounting Type | Surface Mount |
| XLP Technology | Yes (eXtreme Low-Power) |
| PPS (Peripheral Pin Select) | Yes |
| RoHS Status | Compliant |
| MSL Level | 1 |
PIC16F18456-I/SO Pin Configuration
| Pin 1 | RA0 — PORTA bit 0 / analog input |
| Pin 2 | RA1 — PORTA bit 1 / analog input |
| Pin 3 | RA2 — PORTA bit 2 / analog input |
| Pin 4 | RA3 — PORTA bit 3 (input only) |
| Pin 5 | RA4 — PORTA bit 4 / analog input |
| Pin 6 | RA5 — PORTA bit 5 / analog input |
| Pin 7 | RA6 — PORTA bit 6 |
| Pin 8 | RA7 — PORTA bit 7 |
| Pin 9 | VSS — Ground |
| Pin 10 | RB0 — PORTB bit 0 / interrupt-on-change |
| Pin 11 | RB1 — PORTB bit 1 / interrupt-on-change |
| Pin 12 | RB2 — PORTB bit 2 / interrupt-on-change |
| Pin 13 | RB3 — PORTB bit 3 / interrupt-on-change |
| Pin 14 | RB4 — PORTB bit 4 / interrupt-on-change |
| Pin 15 | RB5 — PORTB bit 5 / interrupt-on-change |
| Pin 16 | RB6 — PORTB bit 6 / ICSP CLK |
| Pin 17 | RB7 — PORTB bit 7 / ICSP DAT |
| Pin 18 | VSS — Ground (analog) |
| Pin 19 | VDD — Positive supply |
| Pin 20 | RC0 — PORTC bit 0 |
| Pin 21 | RC1 — PORTC bit 1 |
| Pin 22 | RC2 — PORTC bit 2 |
| Pin 23 | RC3 — PORTC bit 3 / SCL |
| Pin 24 | RC4 — PORTC bit 4 / SDA |
| Pin 25 | RC5 — PORTC bit 5 |
| Pin 26 | RC6 — PORTC bit 6 / TX |
| Pin 27 | RC7 — PORTC bit 7 / RX |
| Pin 28 | VDD — Positive supply (core) |
Typical Applications
PIC16F18456-I/SO is suitable for 6 applications: Low-Power IoT Sensor Node, Consumer Appliance Control Board, Industrial Sensor Signal Conditioning, LED Lighting Controller, Automotive Body Electronics (Non-Safety), USB-to-UART Bridge Companion MCU.
Low-Power IoT Sensor Node
The PIC16F18456-I/SO is a strong fit for battery-powered IoT sensor nodes because of its XLP sleep currents that drop below 50 nA typical and its 1.8 V to 5.5 V operating range, which covers single-cell Li-ion, two AA cells, and coin-cell supplies. Its 12-bit ADC with 24 channels handles multiple sensor inputs (temperature, humidity, light, battery voltage) without external multiplexers. The 28 KB FLASH accommodates small LoRaWAN / BLE-SoC bridge stacks, while the 2 KB RAM keeps a UART command buffer alongside sensor processing. Place a 32.768 kHz crystal on SOSC for RTC duty-cycling and use PPS to route the EUSART to the radio module's TX/RX pins.
Recommended
Consumer Appliance Control Board
For white-goods control boards (washing machines, dishwashers, microwave ovens), the PIC16F18456-I/SO delivers enough analog and digital peripherals to replace multiple discrete timers and op-amps. The 12-bit ADC reads thermistor, water-level, and motor-current inputs; the 5-bit DAC drives a reference for the comparator that monitors line voltage zero-crossings. The CWG generates complementary PWM for a small BLDC or triac-fired motor. The dual EUSART enables a service UART for diagnostics plus a Modbus link to an inverter. Its wide 28-SOIC package simplifies hand-rework on factory production lines.
Recommended
Industrial Sensor Signal Conditioning
In factory automation the PIC16F18456-I/SO acts as a smart front-end that digitizes 4-20 mA loops, RTDs, and bridge sensors with its 12-bit ADC. Its 5-bit DAC generates excitation currents for RTD self-heating compensation, while the comparator implements hardware threshold detection that wakes the CPU only when a measured value crosses a limit. The dual I2C/SPI buses read external EEPROM for calibration data and drive isolated RS-485 transceivers via EUSART for industrial network connectivity. The industrial -40 C to +85 C rating survives cabinet environments without derating.
Recommended
LED Lighting Controller
The PIC16F18456-I/SO drives constant-current LED strings with its 10-bit PWM modules, including smooth dimming down to 0.1% duty cycle via the CWG dead-band control. The 12-bit ADC reads ambient light, color-mixing sensor, and LED forward-voltage feedback for closed-loop control. Two EUSARTs simultaneously run a DMX-512 or DALI bridge and a service UART. With XLP technology, the controller can stay in sleep mode for years on a small backup battery, waking only on an external interrupt for wireless commissioning.
Recommended
Automotive Body Electronics (Non-Safety)
For non-safety body modules such as mirror controllers, HVAC blend-door actuators, and ambient lighting drivers, the PIC16F18456-I/SO provides 28 KB FLASH, two PWMs for motor drive, and a CAN-friendly EUSART that bridges to a transceiver such as the MCP2515. The -40 C to +85 C industrial grade covers most cabin environments. Note: this -I/SO variant is not AEC-Q100 qualified; for safety-relevant modules step up to the PIC16F18456 automotive grade or use a PIC18 K-series.
Recommended
USB-to-UART Bridge Companion MCU
When paired with a USB bridge such as the MCP2200 or MCP2221, the PIC16F18456-I/SO acts as the host-side MCU that receives data over its EUSART and forwards it to local sensors or actuators. Its PPS remapping makes board routing easy when the USB bridge pins and the sensor pins sit far apart on the PCB. With 2 KB RAM, command queuing and small protocol stacks (Modbus, vendor-specific) run without external memory. Industrial temperature grade and XLP sleep make this combination ideal for field-deployed diagnostic tools.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F18456-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F18456-E/SO | PIC16F18456T-I/SO | PIC16F18455T-I/SO | PIC16F18446T-I/SO | PIC16F18444T-I/SO | PIC16F18345-I/SO |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| FLASH Memory | 28 KB | 28 KB | 28 KB | 14 KB (-50%) | 28 KB (0%) | 7 KB (-75%) | 14 KB (-50%) |
| SRAM | 2 KB | 2 KB | 2 KB | 1 KB (-50%) | 2 KB (0%) | 512 B (-75%) | 1 KB (-50%) |
| Maximum Clock | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| ADC Resolution / Channels | 12-bit / 24 ch | 12-bit / 24 ch | 12-bit / 24 ch | 12-bit / 24 ch | 12-bit / fewer ch | 12-bit / fewer ch | 10-bit / fewer ch |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| CWG / PWM | CWG + 2x 10-bit PWM | CWG + 2x PWM | CWG + 2x PWM | CWG + 2x PWM | No CWG / fewer PWM | No CWG | No CWG |
Key Differentiators
- Largest FLASH in PIC16F184xx 28-SOIC family (vs PIC16F18455T-I/SO)
- Includes CWG and dual 10-bit PWM (vs PIC16F18446T-I/SO)
- Dual EUSART plus dual SPI/I2C (vs PIC16F18345-I/SO)
Design Notes
Estimated: when running from a 3.3 V LDO at 32 MHz the PIC16F18456-I/SO draws about 4 mA active; XLP sleep mode drops below 50 nA typical. Decouple VDD with a 100 nF ceramic plus a 10 uF bulk, placed within 5 mm of pins 19 and 28. The analog VDD/VSS pair on pin 19/18 should be tied to the same rails but decoupled separately for clean ADC readings.
Route the ICSP pins RB6 (CLK) and RB7 (DAT) directly to an in-circuit programming header without series resistors to preserve programming reliability. Keep the 32.768 kHz SOSC crystal traces short and symmetric, surrounded by a ground guard ring, because stray capacitance on SOSCO degrades accuracy. Place the 28-SOIC on the top side with no copper pour under the body for easy rework.
PPS (Peripheral Pin Select) mappings must be unlocked via the PPSLOCK register sequence or peripherals stay mapped to defaults, which can appear as 'dead' UART/SPI/PWM. The comparator and DAC outputs share routing resources with the CWG; resolve conflicts during MCC configuration. The 12-bit ADC requires the A/D acquisition time (TAD) be at least 1 us, so at 32 MHz FOSC the ADCON1 setting must select a compatible clock source.
Estimated: at typical 32 MHz active current (4 mA) and 3.3 V supply, power dissipation is about 13 mW; the 28-SOIC theta_JA of approximately 85 C/W yields a junction-to-ambient rise under 2 C. No heatsink is required. The thermal design budget is dominated by adjacent power components and board copper area; standard 1 oz copper pour suffices.
Compliance Information
RoHS compliant per Microchip product page and DigiKey catalog data. -I/SO grade is industrial -40C to +85C; choose -E/SO for extended temperature. Not AEC-Q100 qualified; for safety-relevant automotive modules use a PIC18 K-series or dsPIC33.
