PIC16LF819T-I/SO - 8-bit PIC MCU, 3.5KB Flash, 20MHz | Microchip
MPN: PIC16LF819T-I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.45 | $3.45 |
| 10 | $3.12 | $31.20 |
| 100 | $2.78 | $278.00 |
| 500 | $2.45 | $1,225.00 |
| 1,000 | $2.18 | $2,180.00 |
PIC16LF819T-I/SO Overview
An 8-bit PIC microcontroller is a compact RISC processor with a Harvard architecture - separate program and data buses - that executes one instruction per clock cycle (minus 4-cycle branches) and integrates Flash, RAM, EEPROM, peripherals, and I/O on a single die. PIC16 family devices sit at the entry point of Microchip's mid-range portfolio, providing 14-bit wide instruction words, 35 single-word instructions, and upward code compatibility with PIC12 and PIC16 baseline cores - making them a workhorse for cost-sensitive, low-power embedded control.
Key specifications include an internal 8MHz oscillator (with selectable 31kHz LF oscillator and external oscillator options), 256 bytes of data EEPROM, 5 channels of 10-bit ADC, two 8-bit timers plus one 16-bit timer, a Capture/Compare/PWM module, an addressable USART, and an SPI/I2C MSSP peripheral. Five digital I/O ports are available on the 18-pin package, with Wake-on-Change interrupts on port pins. The device consumes roughly 100 uA active at 1 MHz / 2.0V and drops into the sub-microamp range for sleep currents, ideal for battery telemetry.
Typical applications include remote sensor nodes, battery-backed thermostats, simple motor control, LED drivers, HVAC accessory boards, and small appliance user-interface controllers. The PIC16LF819T-I/SO is also used as a glue/controller MCU for system management tasks in larger designs where a full 32-bit core would be overkill.
Designers should consult the PIC16F819 family datasheet for the LF-grade electrical characteristics and the latest MPLAB XC8 toolchain support. Pin-compatible variants (PIC16LF818, PIC16LF819-I/SO non-T) drop directly onto the same SOIC-18 footprint, enabling reuse across product variants.
This page synthesizes distributor pricing, drop-in alternatives in the same 18-pin SOIC footprint, and practical design notes that are not aggregated in the manufacturer datasheet alone.
Drop-in alternatives for PIC16LF819T-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 PIC16LF819T-I/SO (same form factor and footprint) — differing in Communication, Package, Operating Temperature, Timers, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesPIC16LF819T-I/SO Maximum Ratings & Electrical Characteristics
| Manufacturer | Microchip Technology |
| Series | PIC16F/LF819 |
| Core Architecture | PIC16 (Harvard, RISC, 8-bit) |
| Program Memory | 3.5 KB (2K x 14) Flash |
| Data SRAM | 256 bytes |
| Data EEPROM | 256 bytes |
| Maximum CPU Speed | 20 MHz (200 ns instruction cycle) |
| Supply Voltage (LF grade) | 2.0 V to 3.6 V |
| I/O Pins | 16 (on /SO 18-pin package, 5 ports) |
| ADC | 10-bit, 5 channels |
| Timers | Two 8-bit + one 16-bit |
| CCP Module | 1 x Capture/Compare/PWM |
| Communication | USART (addressable) + MSSP (SPI / I2C) |
| Internal Oscillator | 8 MHz + 31 kHz LF |
| Operating Temperature | -40 C to +85 C (Industrial, "I") |
| Package | SOIC-18 ("/SO"), Tape & Reel ("T") |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC16LF819T-I/SO Pin Configuration
| Pin 1 | RA2/AN2 — Bidirectional I/O / analog channel 2 |
| Pin 2 | RA3/AN3/VREF+ — Bidirectional I/O / analog channel 3 / ADC reference voltage input |
| Pin 3 | RA4/AN4/T0CKI — Bidirectional I/O / analog channel 4 / Timer0 clock input |
| Pin 4 | RA5/AN5/SS — Bidirectional I/O / analog channel 5 / SSP slave select |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RA6/OSC2 — Bidirectional I/O / crystal oscillator output |
| Pin 7 | RA7/OSC1 — Bidirectional I/O / crystal oscillator input |
| Pin 8 | VDD — Positive power supply (2.0V-3.6V LF grade) |
| Pin 9 | RB0/INT — Bidirectional I/O / external interrupt input |
| Pin 10 | RB1 — Bidirectional I/O port pin |
| Pin 11 | RB2 — Bidirectional I/O port pin |
| Pin 12 | RB3/CCP1 — Bidirectional I/O / Capture-Compare-PWM channel 1 |
| Pin 13 | RB4 — Bidirectional I/O / interrupt-on-change |
| Pin 14 | RB5 — Bidirectional I/O / interrupt-on-change |
| Pin 15 | RB6/PGC — Bidirectional I/O / ICSP clock (programming/debug) |
| Pin 16 | RB7/PGD — Bidirectional I/O / ICSP data (programming/debug) |
| Pin 17 | RA0/AN0 — Bidirectional I/O / analog channel 0 |
| Pin 18 | RA1/AN1 — Bidirectional I/O / analog channel 1 |
Typical Applications
PIC16LF819T-I/SO is suitable for 6 applications: Battery-Powered Sensor Node, Thermostat / HVAC Sub-Controller, Small Appliance User Interface, LED Lighting Driver Controller, Industrial Remote Control / IR Receiver, Battery Charger / Power Bank MCU.
Battery-Powered Sensor Node
The PIC16LF819T-I/SO fits battery-powered sensor nodes thanks to its 2.0V-3.6V LF supply range and sub-microamp sleep current. The 10-bit ADC samples a thermistor or analog sensor at 100 ksps while the USART/MSSP streams data over a 2.4GHz radio module such as the MRF24J40 or a sub-GHz TI CC1101. Wake-on-Change interrupt on RB ports lets the MCU idle in sleep for months on a single CR2032 coin cell, waking only when a digital sensor toggles. Compared to PIC16F88x parts, the LF819 cuts active current by ~30 percent, extending battery life without sacrificing the 5 MIPS throughput needed for lightweight protocol stacks.
Recommended
Thermostat / HVAC Sub-Controller
The PIC16LF819T-I/SO is well matched to low-cost thermostat and HVAC accessory boards where the 18-pin SOIC footprint, 256B EEPROM, and 5-channel ADC simplify front-panel UI scanning and remote temperature sensing. It reads a 10k NTC thermistor via the ADC, drives triac-triggered loads through the CCP1 PWM module, and stores setpoint schedules in the internal EEPROM without external memory. The industrial -40C to +85C temperature grade tolerates indoor equipment closets, while the SOIC-18 outline survives wave-solder or hand rework on legacy HVAC control assemblies. Compared to PIC16F18855, the LF819 has lower cost and a smaller code footprint, fitting firmware sizes under 2 KB comfortably.
Recommended
Small Appliance User Interface
Small kitchen and personal-care appliances use the PIC16LF819T-I/SO as a UI controller driving 7-segment LED displays and capacitive touch buttons. The 16 I/O pins multiplex up to 4 digit displays and a 4x4 key matrix without external latches, while the MSSP talks to an I2C EEPROM for storing user presets. The 20MHz core executes debounce routines in microseconds, freeing CPU time for the CCP PWM driving a brushless motor control feedback loop. The LF supply range (2.0V-3.6V) supports 2xAA or Li-ion powered appliances directly. Designers route traces for SOIC-18 hand-solder rework to ease after-sales service on field-return units.
Recommended
LED Lighting Driver Controller
The PIC16LF819T-I/SO is widely deployed as the local controller for LED lighting modules that combine constant-current drivers with PWM dimming and DMX512 or DALI reception. The CCP1 module generates up to 10-bit resolution PWM dimming at low frequencies suitable for driving high-brightness LEDs via external MOSFETs like the IRF7507 or NTD4960N. The USART decodes DMX512 differential signaling through an external transceiver such as the SN75176. The 2.0V-3.6V LF supply matches 3.3V-only LED driver rails, and the 256B EEPROM stores calibration tables for tunable-white fixtures. The 18-pin SOIC package also fits the standard 25.4mm LED driver PCB form factor.
Recommended
Industrial Remote Control / IR Receiver
Industrial remote controls and IR receiver boards pair the PIC16LF819T-I/SO with a TSOP1738-style IR demodulator. The CCP1 capture input timestamps demodulated IR edges for NEC, RC5, or Sony SIRC protocol decoding, while the 16-bit timer generates the carrier-frequency PWM for transmit-side designs. The 256B RAM comfortably buffers 32 button codes per device pairing. The LF supply range (2.0V-3.6V) supports 3V lithium primary cells, and the SOIC-18 outline occupies minimal PCB space inside handheld enclosures. Designers also leverage the internal 8MHz oscillator to skip an external resonator, reducing BOM cost and saving two GPIO pins.
Recommended
Battery Charger / Power Bank MCU
Single-cell Li-ion and LiFePO4 charger/power-bank modules use the PIC16LF819T-I/SO as a state-machine controller for CC/CV charging, button-press input, and 4-LED capacity display. The 5-channel ADC monitors battery voltage, charging current (across a 50m ohm shunt), and NTC thermistor temperature for safety cutoff. The CCP1 PWM modulates a buck converter gate driver such as the MCP16331. The 2.0V-3.6V LF supply range runs directly from a single LiFePO4 cell voltage, while the SOIC-18 outline supports compact cylindrical cell holders. The 256B EEPROM stores user-configurable cutoff voltages and LED brightness curves across product variants.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LF819T-I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LF819-I/SO | PIC16LF818T-I/SO | PIC16LF819-I/SS |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-18 (/SO) tape & reel | SOIC-18 (/SO) tray | SOIC-18 (/SO) tape & reel | SSOP-20 (/SS) |
| Flash Memory | 3.5 KB (2K x 14) | 3.5 KB | 1.75 KB (-50%) | 3.5 KB |
| SRAM | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| Data EEPROM | 256 bytes | 256 bytes | 256 bytes | 256 bytes |
| CPU Speed | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS | 20 MHz / 5 MIPS |
| Supply Voltage | 2.0 V - 3.6 V (LF) | 2.0 V - 3.6 V | 2.0 V - 3.6 V | 2.0 V - 3.6 V |
| ADC Channels | 5 x 10-bit | 5 x 10-bit | 5 x 10-bit | 5 x 10-bit |
Key Differentiators
- Identical SOIC-18 footprint with full Flash parity (vs PIC16LF819-I/SO)
- 50% larger Flash than PIC16LF818 (vs PIC16LF818T-I/SO)
- LF-grade extended low-voltage range (vs PIC16F819-I/SO (F grade))
- Industrial temperature grade (-40C to +85C) (vs PIC16LF819T-E/SO (E grade))
Design Notes
Estimated: with VDD = 3.3 V and CPU running at 8 MHz from the internal oscillator, active current is roughly 1.0 mA; at 1 MHz active drops to ~120 uA. Sleep current with WDT disabled falls under 1 uA per the Microchip PIC16F819 family datasheet. Decouple VDD with a 100 nF X7R ceramic placed within 5 mm of pin 8 and a bulk 10 uF tantalum on the same net for clean ADC readings.
Always configure MCLR/RA5 separately from the ADC channel; when pin 4 is used as analog AN5, the MCLR function (which is multiplexed on this pin) must be enabled or disabled correctly per CONFIG register settings to avoid accidental resets. The configuration bits are write-once - any mistake requires erasing the entire device. Always review CONFIG in MPLAB X and place a 10 kohm pull-up on MCLR if used in reset mode.
Use a continuous ground pour under the SOIC-18 footprint to keep digital switching noise out of the ADC reference voltage. Place the ADC reference bypass (4.7 uF + 100 nF) on VREF+ as close to pin 2 as possible. If using the internal 8 MHz oscillator, keep RB6 and RB7 (ICSP pins) accessible - they share the PGC/PGD programming lines and must reach the PICkit header. Trace length under 50 mm avoids ICSP timing issues during debug.
Long traces (>25 mm) on oscillator pins (RA6/OSC2 and RA7/OSC1) will pick up noise and cause erratic Fosc. Place the crystal or resonator within 5 mm of those pins and guard both sides with ground pour. For the internal 8 MHz oscillator, an external 33 pF load capacitor pair is not needed - the internal load caps are selected via the OSCCON register, simplifying the BOM for cost-sensitive designs.
Compliance Information
RoHS compliant and lead-free per Microchip product page (microchip.com/en-us/product/PIC16F819). Not AEC-Q100 qualified - choose PIC16F819-I/P automotive grade for under-hood applications.
