PIC16F18445-I/SO - 8-Bit 32MHz XLP MCU, 14KB Flash | Microchip
MPN: PIC16F18445-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.27 | $2.27 |
| 10 | $2.1 | $21.00 |
| 100 | $1.85 | $185.00 |
| 500 | $1.62 | $810.00 |
| 1,000 | $1.45 | $1,450.00 |
PIC16F18445-I/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (Flash/RAM/EEPROM), peripherals (ADC, timers, communication), and I/O pins on a single silicon die. PIC16 microcontrollers sit in the product hierarchy as: PIC16 -> PIC10/12/16/18 family -> 8-bit MCU -> microcontroller -> embedded IC -> semiconductor. The XLP (eXtreme Low-Power) designation indicates the family is optimized for ultra-low-power operation, making it ideal for battery-powered applications.
The device integrates Core Independent Peripherals (CIPs) including a 12-bit ADC with Computation (ADCC), two 10-bit PWMs, a Digital-to-Analog Converter (DAC), a Comparator, a Complementary Waveform Generator (CWG), and configurable logic cells. Communication is handled by EUSART, SPI, and I2C peripherals. Functional Safety (FuSa) features support IEC 61508 SIL applications.
Architecturally, the PIC16F18445 uses an enhanced mid-range 8-bit core with a hardware multiplier and 49 instructions, executing most instructions in one clock cycle at up to 32MHz (8 MIPS). The ADCC automates averaging, oversampling, and threshold comparison without CPU intervention, freeing the core for power-management tasks.
Typical applications include IoT sensor nodes, consumer white goods, battery-powered measurement devices, low-power wireless sensor interfaces, LED lighting controllers, and industrial control where tight power budgets and rich analog integration simplify BOM.
When designing with this part, budget I/O pins carefully - the 20-pin SOIC exposes 17 I/O, limiting concurrent peripheral use. Plan clock source selection (internal 32MHz HFINTOSC vs. external crystal) early, as the choice affects both power and accuracy.
This page synthesizes distributor pricing, same-family drop-in alternatives in SOIC-20, and design notes not consolidated in any single source.
Drop-in alternatives for PIC16F18445-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 PIC16F18445-I/SO (same form factor and footprint) — differing in Package, ADC, PWM Channels, Program Memory (Flash), Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F18446-I/SO
✅ Drop-In✓ In Stock
$1.08 / Unit
View Datasheet →PIC16F18444-I/SO
✅ Drop-In✓ In Stock
$0.68 / Unit
View Datasheet →PIC16F18345-I/SO
✅ Drop-In✓ In Stock
$1.28 / Unit
View Datasheet →PIC16F18445-E/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F1829-I/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.12 / Unit
View Datasheet →PIC16F18445-I/SO Maximum Ratings & Electrical Characteristics
| Program Memory (Flash) | 14 KB (8K x 14 words) |
| Data RAM | 1 KB |
| Data EEPROM | 256 B |
| CPU | 8-bit PIC16 enhanced mid-range |
| Maximum CPU Speed | 32 MHz (8 MIPS) |
| Operating Voltage Range | 2.3 V to 5.5 V |
| ADC | 12-bit ADCC, up to 17 channels |
| DAC | 5-bit / 8-bit |
| Comparators | Yes |
| PWM | 2 x 10-bit |
| CWG | Complementary Waveform Generator |
| Communication | EUSART, SPI, I2C |
| I/O Pins | 17 |
| Package | 20-pin SOIC (7.50 mm width) |
| Operating Temperature | -40 C to +85 C (Industrial) |
| MSL Level | 3 (168 hours) |
| XLP (eXtreme Low Power) | Yes |
| Functional Safety | FuSa-capable (IEC 61508 SIL) |
| RoHS | Compliant |
PIC16F18445-I/SO Pin Configuration
| Pin 1 | RA0 — Bidirectional I/O / ADC channel |
| Pin 2 | RA1 — Bidirectional I/O / ADC channel |
| Pin 3 | RA2 — Bidirectional I/O / ADC channel / DAC output |
| Pin 4 | RA3 — Bidirectional I/O / ADC channel / reference voltage |
| Pin 5 | RA4 — Bidirectional I/O / ADC channel |
| Pin 6 | RA5 — Bidirectional I/O / ADC channel |
| Pin 7 | RA6 — Bidirectional I/O / oscillator |
| Pin 8 | RA7 — Bidirectional I/O / oscillator |
| Pin 9 | VSS — Ground reference |
| Pin 10 | RB0 — Bidirectional I/O / interrupt-on-change |
| Pin 11 | RB1 — Bidirectional I/O / interrupt-on-change |
| Pin 12 | RB2 — Bidirectional I/O / interrupt-on-change |
| Pin 13 | RB3 — Bidirectional I/O / interrupt-on-change |
| Pin 14 | RB4 — Bidirectional I/O / interrupt-on-change |
| Pin 15 | RB5 — Bidirectional I/O / interrupt-on-change |
| Pin 16 | RB6 — Bidirectional I/O / ICD clock |
| Pin 17 | RB7 — Bidirectional I/O / ICD data |
| Pin 18 | VSS — Ground reference (optional secondary) |
| Pin 19 | VDD — Positive supply voltage |
| Pin 20 | RA6 — Bidirectional I/O / oscillator (alternate function) |
Typical Applications
PIC16F18445-I/SO is suitable for 6 applications: Battery-Powered IoT Sensor Node, Consumer White Goods Control, LED Lighting Controller, Industrial Process Sensor Transmitter, Low-Power Wireless Sensor Interface, Small Appliance User Interface.
Battery-Powered IoT Sensor Node
The PIC16F18445-I/SO fits battery-powered IoT sensor nodes because its XLP technology delivers sleep currents in the sub-microamp range while the integrated 12-bit ADCC offloads sensor averaging and threshold comparison from the CPU. The 2.3V minimum supply supports 2xAA alkaline chemistries down to near end-of-life voltage, extending field replacement intervals. The 32MHz HFINTOSC eliminates external crystals for cost-sensitive nodes, and 17 I/O pins comfortably accommodate I2C/SPI sensor clusters plus a status LED. Designers can duty-cycle the MCU to under 1% active time, achieving multi-year battery life on a single coin cell.
Recommended
Consumer White Goods Control
The PIC16F18445-I/SO is well suited for consumer white goods such as coffee machines, microwaves, and washing machine user interfaces because its 20-SOIC package fits compact control boards while delivering 14KB Flash for state-machine firmware. The CWG (Complementary Waveform Generator) directly drives half-bridge FET pairs for induction heating or motor control, eliminating external gate-driver ICs. The DAC and 12-bit ADCC support closed-loop temperature or humidity regulation, and the EUSART interfaces with the main appliance MCU for HMI coordination. Industrial -40 C to +85 C rating covers kitchen and laundry environments.
Recommended
LED Lighting Controller
The PIC16F18445-I/SO controls LED lighting fixtures by leveraging its two 10-bit PWM channels and CWG to drive constant-current LED strings without external drivers. The DAC enables smooth logarithmic dimming curves that match human eye perception, while the comparator implements over-temperature foldback protection by sensing an NTC thermistor. The 32MHz core executes Tristimulus or warm-dim color-mixing algorithms in real time. SPI/I2C peripherals interface with wireless modules for app-controlled smart bulbs, and XLP low-power modes keep standby consumption below regulatory limits for energy-star compliance.
Recommended
Industrial Process Sensor Transmitter
The PIC16F18445-I/SO serves as the brains of 4-20mA loop-powered process sensor transmitters thanks to its 12-bit ADCC for accurate bridge sensor readings and DAC for precise 4-20mA current loop drive. Functional Safety (FuSa) features support IEC 61508 SIL 1/2 designs common in process automation. The 2.3V minimum supply operates from loop-derived voltages down to 3.3V after LDO regulation. EUSART interfaces with HART modems for bidirectional digital communication over the same 4-20mA loop, and the industrial temperature range covers outdoor and hazardous-location installations.
Recommended
Low-Power Wireless Sensor Interface
The PIC16F18445-I/SO interfaces with sub-GHz or BLE wireless modules in low-power sensor applications by hosting the application logic while the radio handles transmission. SPI bus runs at full 32MHz peripheral clock to keep radio interaction fast and deterministic, allowing the MCU to return to sleep quickly. The 1KB RAM buffers sensor samples between transmissions, and the configurable logic cells implement hardware glue that wakes the radio on sensor threshold events without CPU intervention. This combination reduces average system current by 30-50% compared to MCU-driven polling architectures.
Recommended
Small Appliance User Interface
The PIC16F18445-I/SO drives small appliance user interfaces such as toaster ovens, rice cookers, and air purifiers, where the 20-SOIC footprint and 17 I/O pins support capacitive touch buttons, rotary encoder input, and seven-segment or LCD displays. The CWG drives buzzers and small motors for haptic feedback, while timers handle precise cooking-cycle timing. EEPROM-backed user settings persist across power cycles, and the 12-bit ADCC reads thermistor inputs for closed-loop temperature control. Low-cost external crystals are optional thanks to the calibrated internal 32MHz oscillator.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F18445-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F18446-I/SO | PIC16F18444-I/SO | PIC16F18345-I/SO | PIC16F18445-E/SO | PIC16F1829-I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-pin SOIC | 20-pin SOIC - same | 20-pin SOIC - same | 20-pin SOIC - same | 20-pin SOIC - same | 20-pin SOIC - same |
| Flash Memory | 14 KB | 28 KB (+100%) | 7 KB (-50%) | 14 KB (same) | 14 KB (same) | 14 KB (same) |
| RAM | 1 KB | 2 KB (+100%) | 512 B (-50%) | 1 KB (same) | 1 KB (same) | 1 KB (same) |
| ADC | 12-bit ADCC | 12-bit ADCC (same) | 12-bit ADCC (same) | 10-bit ADC (older) | 12-bit ADCC (same) | 10-bit ADC (older) |
| CWG | Yes | Yes | Yes | No (older gen) | Yes | No (older gen) |
| Functional Safety (FuSa) | Yes | Yes | Yes | No | Yes | No |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +125 C (extended) | -40 C to +85 C |
| Unit Price (approx qty-1) | $2.27 | $2.40 | $1.95 | $2.10 | $2.55 | $1.85 |
Key Differentiators
- 12-bit ADCC vs 10-bit legacy ADC (vs PIC16F18345-I/SO)
- Functional Safety (FuSa) capability (vs PIC16F1829-I/SO)
- Configurable Logic Cells (CLC) integration (vs PIC16F18345-I/SO)
Design Notes
Use the PIC16F18445-I/SO's XLP sleep modes aggressively. Estimated: with HFINTOSC disabled and the 12-bit ADCC running one conversion per second from a 32.768kHz external watch crystal, the average current can drop below 5 uA at 3V. The ADCC's hardware oversampling and threshold comparison offload work that would otherwise keep the CPU active. Avoid leaving unused peripherals clocked - gate each peripheral's clock via the PMD registers to prevent phantom current draw of 10-50 uA each.
Place a 100nF decoupling capacitor within 5mm of the VDD pin and a 10uF bulk capacitor near the MCU power input. The 20-SOIC package has only one VDD pin (pin 19) and one VSS pin (pin 9) on this die variant, so low-impedance power routing is critical. Keep the analog AVREF traces short and isolated from digital switching lines to preserve 12-bit ADC accuracy.
Do not confuse the -I/SO (industrial -40C to +85C) with the -E/SO (extended -40C to +125C) temperature grade. They are pin-compatible but the -E/SO costs more. Watch out for the 20-pin PIC16F18444 vs PIC16F18445 vs PIC16F18446 die variants: they share the same SOIC-20 footprint but have different Flash/RAM densities. Use the correct linker script in MPLAB X IDE so code is built against the right memory map, or the firmware will silently overflow into unimplemented memory regions.
The PIC16F18445-I/SO's SPI peripheral can run at full peripheral clock speed (FOSC/4 = 8 MHz at 32 MHz core). When driving long SPI traces or cables, add 33 ohm series damping resistors at the source to limit ringing. For I2C buses above 400 kHz, ensure the rise time is below the I2C specification (300 ns at 400 kHz Fast Mode) by adding pull-up resistors in the 1k-2k ohm range rather than 10k ohm.
Compliance Information
RoHS and REACH compliant per Microchip product environmental compliance documentation. Functional Safety (IEC 61508 SIL) documentation available from Microchip; not AEC-Q100 qualified (automotive users should evaluate PIC16F18445-E/SSVAO automotive part number).
