PIC16LF18854-I/SO - 8-Bit 32MHz XLP MCU 7KB Flash | Microchip
MPN: PIC16LF18854-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.55 | $2.55 |
| 10 | $2.29 | $22.90 |
| 100 | $2.04 | $204.00 |
| 500 | $1.83 | $915.00 |
| 1,000 | $1.63 | $1,630.00 |
PIC16LF18854-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 configurable set of analog and digital peripherals on one die. 8-bit MCUs sit at the base of the embedded hierarchy: microcontroller -> embedded processor -> semiconductor IC, and they remain the volume choice for cost-sensitive, deterministic, and ultra-low-power designs where 32-bit overhead is unnecessary. The PIC16LF18854 occupies the 'XLP-enhanced mid-range' niche in this taxonomy, balancing arithmetic throughput with sub-uA sleep currents.
Key features include 24-channel 10-bit ADC with computation (ADC2), two comparators, an 8-bit DAC, two I2C/SPI/EUSART peripherals, and Peripheral Pin Select (PPS) for flexible signal routing. A four-channel 16-bit PWM, Complementary Waveform Generator (CWG), and Numerically Controlled Oscillator (NCO) provide mixed-signal capability without burdening the core. Integrated op-amps on selected variants and zero-crossing detect support closed-loop analog control. The 28-SOIC package exposes 25 I/O pins plus dedicated oscillator and programming/debug pins for ICSP (In-Circuit Serial Programming).
The PIC16LF18854 implements a 14-bit instruction word, hardware stack, and direct/indirect data addressing with linear memory mapping up to 32 KB. Internal 32 MHz oscillator accuracy is calibrated to within +/-1 % across the industrial temperature range, removing the need for an external crystal in many applications. Active current is typically in the low-uA/MIPS range and sleep current drops to the order of tens of nanoamperes with RTCC and WWDT active, supported by power-managed Run, Doze, Idle, and Sleep states.
Typical applications include low-power IoT sensor nodes, wearable health monitors, battery-powered HVAC controls, remote controls, smart metering, and general-purpose 8-bit embedded control. When designing with this device, use the MPLAB X IDE with MPLAB XC8 compiler, and configure PPS carefully before assigning peripherals to physical pins to avoid runtime mapping conflicts.
Drop-in alternatives for PIC16LF18854-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 PIC16LF18854-I/SO (same form factor and footprint) — differing in ADC, Package, Operating Temperature, Core Architecture, Program Memory (Flash).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LF18854-I/SS
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF18854-I/SP
✅ Drop-In✓ In Stock
$1.22 / Unit
View Datasheet →PIC16LF18855-I/SO
✅ Drop-In✓ In Stock
$1.24 / Unit
View Datasheet →PIC16LF18856-I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF18857-I/SO
✅ Drop-In✓ In Stock
$1.95 / Unit
View Datasheet →PIC16F18854-I/SO
✅ Drop-In✓ In Stock
$0.82 / Unit
View Datasheet →PIC16LF18854-E/SS
✅ Drop-In✓ In Stock
$1.38 / Unit
View Datasheet →PIC16LF18854-I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC enhanced mid-range |
| CPU Speed | 32 MHz (32 MIPS) |
| Program Memory | 7 KB (4K x 14) Flash |
| Data SRAM | 1 KB |
| Data EEPROM | 256 bytes |
| Supply Voltage Range | 1.8 V to 3.6 V |
| I/O Pins | 25 |
| ADC | 10-bit, up to 24 channels, ADC2 with computation |
| Comparators | 2 |
| DAC | 8-bit |
| Communication Peripherals | 2x EUSART, 2x SPI, 2x I2C |
| PWM Channels | 4 (16-bit) |
| Package | 28-pin SOIC (SO, 300 mil) |
| Operating Temperature | -40 C to +85 C (industrial, suffix I) |
| Low-Power Technology | XLP (eXtreme Low Power) |
| PPS (Peripheral Pin Select) | Yes |
| ICSP (In-Circuit Serial Programming) | Yes |
| RoHS Status | Compliant |
PIC16LF18854-I/SO Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O with PPS, analog input |
| Pin 2 | RA3 — Bidirectional I/O with PPS, analog input |
| Pin 3 | RA4 — Bidirectional I/O with PPS, analog input |
| Pin 4 | RA5 — Bidirectional I/O with PPS, analog input |
| Pin 5 | RA6 — Bidirectional I/O with PPS |
| Pin 6 | RA7 — Bidirectional I/O with PPS, oscillator output |
| Pin 7 | VSS — Ground reference |
| Pin 8 | RA0 — Bidirectional I/O with PPS, analog input |
| Pin 9 | RA1 — Bidirectional I/O with PPS, analog input |
| Pin 10 | RB0 — Bidirectional I/O with PPS, interrupt-on-change |
| Pin 11 | RB1 — Bidirectional I/O with PPS, interrupt-on-change |
| Pin 12 | RB2 — Bidirectional I/O with PPS, interrupt-on-change |
| Pin 13 | RB3 — Bidirectional I/O with PPS, interrupt-on-change |
| Pin 14 | RB4 — Bidirectional I/O with PPS, interrupt-on-change |
| Pin 15 | RB5 — Bidirectional I/O with PPS, interrupt-on-change |
| Pin 16 | RB6 — Bidirectional I/O with PPS, ICDCLK |
| Pin 17 | RB7 — Bidirectional I/O with PPS, ICDDATA |
| Pin 18 | RC0 — Bidirectional I/O with PPS, analog input |
| Pin 19 | RC1 — Bidirectional I/O with PPS, analog input |
| Pin 20 | RC2 — Bidirectional I/O with PPS, analog input |
| Pin 21 | RC3 — Bidirectional I/O with PPS, analog input |
| Pin 22 | RC4 — Bidirectional I/O with PPS, analog input |
| Pin 23 | RC5 — Bidirectional I/O with PPS, analog input |
| Pin 24 | RC6 — Bidirectional I/O with PPS, analog input |
| Pin 25 | RC7 — Bidirectional I/O with PPS, analog input |
| Pin 26 | VSS — Ground reference (second) |
| Pin 27 | VDD — Positive supply 1.8 V to 3.6 V |
| Pin 28 | VDD — Positive supply 1.8 V to 3.6 V (second) |
Typical Applications
PIC16LF18854-I/SO is suitable for 6 applications: Battery-Powered IoT Sensor Node, Wearable Health Monitor, Smart HVAC Thermostat, Remote Control / Consumer IR, Smart Metering and Utility Endpoints, General-Purpose 8-bit Embedded Control.
Battery-Powered IoT Sensor Node
The PIC16LF18854-I/SO is well suited to battery-powered IoT sensor nodes because its LF process supports 1.8 V to 3.6 V operation from a single Li-Ion or two-cell alkaline supply, eliminating the boost converter. The XLP technology delivers sleep currents in the tens of nA with WWDT and RTCC active, enabling multi-year coin-cell runtime. The 24-channel ADC2 with computation offloads averaging and threshold detection in hardware, letting the core wake only on threshold crossings rather than polling - a critical feature for duty-cycled sensor nodes running at <1% active duty cycle.
Recommended
Wearable Health Monitor
In wearable health monitors, the PIC16LF18854-I/SO functions as a low-cost, ultra-low-power signal conditioner and controller. The 24-channel ADC2 captures photoplethysmography (PPG), skin-temperature, and motion sensor outputs while integrated op-amps and comparators condition the analog front-end without external active components. The 8-bit DAC generates bias voltages for optical sensor LEDs. With PPS the same firmware can map peripherals across different PCB revisions, accelerating wearable form-factor iteration. The 1.8 V minimum supply enables direct Li-Ion cell operation.
Recommended
Smart HVAC Thermostat
The PIC16LF18854-I/SO drives smart HVAC thermostats by combining temperature sensing, user interface handling, and relay/triac control in one chip. The 10-bit ADC2 reads multiple thermistor inputs for indoor, outdoor, and supply-air sensing, while the 16-bit PWM channels control variable-speed fan outputs. The two comparators implement zero-crossing detection for triac dimming of incandescent or LED indicator rings. HLT (Hardware Limit Timer) and WWDT satisfy IEC 60730 Class B software-safety expectations for unattended household thermal-control equipment.
Recommended
Remote Control / Consumer IR
The PIC16LF18854-I/SO is a cost-effective controller for IR remote controls and other consumer button-interface products. The integrated CWG (Complementary Waveform Generator) and NCO (Numerically Controlled Oscillator) generate precisely tuned 36-40 kHz carrier waveforms for IR LED modulation without software overhead. Sleep current below 1 uA with wake-on-change on RB I/O pins enables multi-year battery life on two AAA cells. PPS allows the same firmware to drive different PCB layouts, reducing SKU count across product variants.
Recommended
Smart Metering and Utility Endpoints
For smart electricity, gas, and water metering endpoints, the PIC16LF18854-I/SO provides reliable 8-bit processing with the safety features utility regulators expect. The CRC/SCAN peripheral performs periodic memory integrity verification without CPU intervention - a Class B functional-safety requirement. The HLT and WWDT prevent firmware lockup from EMI-induced glitches typical in dense meter enclosures. The 1.8 V minimum supply supports single Li-Ion or Li-SOCl2 primary cell operation, giving 10+ year service life in low-duty metering applications.
Recommended
General-Purpose 8-bit Embedded Control
The PIC16LF18854-I/SO serves as a flexible general-purpose MCU for any 8-bit embedded control task: appliance control boards, LED drivers, fan controllers, simple HMI panels, and hobby projects. The 28-SOIC package is hand-solderable for prototypes and breadboards, while the rich peripheral set (EUSART, SPI, I2C, PWM, ADC, DAC, comparators) covers most interface needs. MPLAB X IDE with XC8 compiler provides a free toolchain with hardware debug support via ICSP, lowering the entry barrier for engineers and makers.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LF18854-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LF18854-I/SS | PIC16LF18854-I/SP | PIC16LF18855-I/SO | PIC16LF18856-I/SO | PIC16LF18854-E/SS |
|---|---|---|---|---|---|---|
| Package | 28-SOIC (300 mil) | 28-SSOP - same pinout, smaller footprint | 28-SPDIP - same pinout, through-hole | 28-SOIC - same footprint | 28-SOIC - same footprint | 28-SSOP - same pinout, E temp grade |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Flash | 7 KB (4K x 14) | 7 KB - identical | 7 KB - identical | 14 KB - 2x upgrade | 28 KB - 4x upgrade | 7 KB - identical |
| SRAM | 1 KB | 1 KB - identical | 1 KB - identical | 1 KB - identical | 2 KB - 2x upgrade | 1 KB - identical |
| EEPROM | 256 bytes | 256 B - identical | 256 B - identical | 256 B - identical | 256 B - identical | 256 B - identical |
| Supply Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V - identical | 1.8 V to 3.6 V - identical | 1.8 V to 3.6 V - identical | 1.8 V to 3.6 V - identical | 1.8 V to 3.6 V - identical |
| CPU Speed | 32 MHz / 32 MIPS | 32 MHz - identical | 32 MHz - identical | 32 MHz - identical | 32 MHz - identical | 32 MHz - identical |
| Temperature Grade | -40 to +85 C (I) | -40 to +85 C - identical | -40 to +85 C - identical | -40 to +85 C - identical | -40 to +85 C - identical | -40 to +125 C (E) - extended |
| ADC Channels | 24 x 10-bit ADC2 | 24 - identical | 24 - identical | 24 - identical | 24 - identical | 24 - identical |
| Approx Unit Price (qty 1) | $2.55 | $2.55 - identical | $2.55 - identical | $2.95 - slightly higher | $3.45 - higher | $2.85 - higher |
Key Differentiators
- Lowest voltage operation in PIC16F1xx family (vs PIC16F18854-I/SO (F process))
- Drop-in memory upgrade path within same package (vs PIC16LF18855-I/SO)
- Core-independent peripherals reduce firmware complexity (vs PIC16F18854-I/SO)
- Wide temperature grade option available in same family (vs PIC16LF18854-I/SO (industrial))
Design Notes
Decouple both VDD pins (27 and 28) with a 100 nF ceramic capacitor placed within 5 mm of each pin. Add a bulk 1-10 uF capacitor on the main VDD rail. The LF process supports 1.8-3.6 V - never exceed 3.6 V or operation becomes undefined. For battery applications, use Sleep mode with RTCC and WWDT active; typical sleep current is in the tens of nA per Microchip XLP datasheet figures.
Route ICSPCLK (RB6) and ICSPDAT (RB7) directly to a 6-pin header for ICSP and ICD debugging. Avoid placing 50 mil traces under the SOIC; the 28-SOIC (300 mil) body is hand-solderable but reflow profiles must follow JEDEC J-STD-020. Keep the analog AVdd/AVss pins bypassed separately if the ADC accuracy of better than +/-1 LSB is required across temperature.
Configure PPS (Peripheral Pin Select) before assigning peripheral functions to physical pins in firmware. PPS lock can be enabled in configuration bits to prevent runtime remapping that could cause signal conflicts. Place the 32.768 kHz crystal for Timer1/RTCC as close as possible to the SOSCO/SOSCI pins with a guard ring to minimize stray capacitance. Reference Microchip AN2804 for low-power PCB layout techniques.
Do not assume the PIC16LF18854 and PIC16F18854 are interchangeable - the F variant requires 2.3 V minimum and cannot operate below that, while the LF variant supports 1.8 V minimum. Using F firmware on an LF device in a 1.8-2.2 V system will result in undefined behavior. Always match the device suffix (LF vs F) to your power supply design.
For EUSART/SPI/I2C signal integrity, add 4.7 kohm pull-ups on I2C SDA/SCL lines and keep traces under 50 mm when running at 400 kHz or above. Place a series 33 ohm resistor on SPI SCK near the master for impedance matching when driving multiple slaves. Use the PPS output remap feature to place peripherals on adjacent pins to minimize trace crossings in 4-layer boards.
Compliance Information
RoHS and REACH compliant per Microchip product page. Lead-free and halogen-free per SOIC packaging materials. Not AEC-Q100 qualified - for AEC-Q100 automotive use, consult Microchip automotive-grade PIC product line. Conflict-minerals compliant per Microchip CMRT.
