PIC16LF1902-I/MV - 8-Bit 20MHz MCU 3.5KB Flash LCD 28-UQFN | Microchip
MPN: PIC16LF1902-I/MV ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.66 | $16.60 |
| 100 | $1.48 | $148.00 |
| 500 | $1.32 | $660.00 |
| 1,000 | $1.18 | $1,180.00 |
| 3,000 | $1.05 | $3,150.00 |
PIC16LF1902-I/MV Overview
An 8-bit microcontroller (MCU) is a single-chip computer built around an 8-bit data path, integrating a CPU core, non-volatile program memory, working RAM, and a configurable set of peripheral blocks. The PIC16F family is part of the broader Microchip mid-range 8-bit MCU hierarchy: PIC10/12/16/18 -> 8-bit MCU -> microcontroller -> embedded controller -> semiconductor. Mid-range 8-bit MCUs target cost-sensitive, deterministic control tasks where simplicity, low power, and compact package options outperform 32-bit alternatives.
Key features include an enhanced mid-range core with 49 instructions and 16-level hardware stack, up to 25 mA source/sink current on I/O pins for direct LED drive, an internal 16 MHz oscillator that eliminates external crystals in many designs, and on-chip LCD segment drive support (up to 72 segments) for glass-display user interfaces. Eleven channels of 10-bit ADC with voltage reference, an integrated temperature indicator, brown-out reset (BOR), in-circuit serial programming (ICSP), and an extended watchdog timer (EWDT) round out the integrated peripheral set. The industrial temperature grade (-40 °C to +85 °C) suits outdoor and factory-floor deployments.
Typical applications include low-power IoT sensor nodes, battery-powered metering and remote controls, LCD-based consumer appliances, white-goods front panels, and portable medical devices. The integrated LCD driver and ultra-low sleep current allow direct connection to glass displays without an external LCD controller, reducing both BOM cost and PCB area compared to discrete MCU-plus-driver designs.
When designing with this part, take advantage of the internal 16 MHz oscillator when possible to save two PCB pins and two external capacitors; reserve the ADC channels for slow-moving analog signals (the 10-bit converter is well-matched to sensor conditioning but not to wideband audio). The 28-UQFN 4x4 mm footprint requires careful thermal via placement under the exposed pad for reliable reflow and slightly higher thermal dissipation than larger leaded variants.
This page synthesizes distributor pricing, drop-in same-package alternatives (28-UQFN 4x4), and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC16LF1902-I/MV — 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 PIC16LF1902-I/MV (same form factor and footprint) — differing in ADC, Operating Temperature, Package, Program Memory (Flash), Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LF1903-I/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF1904-I/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF18855-I/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF18856-I/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF1789-I/MV
✅ Drop-In✓ In Stock
$2.51 / Unit
View Datasheet →PIC16LF18455-I/MV
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LF1902-I/MV Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC Enhanced Mid-Range 8-bit |
| Instruction Set Width | 14-bit |
| Instruction Count | 49 |
| Stack Levels | 16 |
| Program Memory (Flash) | 3.5 KB (2K x 14) |
| Data SRAM | 128 bytes |
| Maximum CPU Frequency | 20 MHz |
| Supply Voltage (Vdd) | 1.8 V to 3.6 V |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| I/O Pin Count | Up to 25 bidirectional |
| I/O Source/Sink Current | 25 mA per pin |
| ADC | 11-channel, 10-bit with Voltage Reference |
| Timers | One 8-bit (TMR0), One 16-bit (TMR1), Extended WDT (EWDT) |
| LCD Driver | Up to 72 segment drive support |
| Internal Oscillator | 16 MHz |
| Brown-Out Reset (BOR) | Yes |
| In-Circuit Serial Programming (ICSP) | Yes |
| Package | 28-pin UQFN 4x4 mm (MV) with exposed pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
PIC16LF1902-I/MV Pin Configuration
| Pin 1 | RA5 — Bidirectional I/O / analog input |
| Pin 2 | RA4 — Bidirectional I/O |
| Pin 3 | RA3 — Bidirectional I/O / MCLR |
| Pin 4 | RA2 — Bidirectional I/O / analog input |
| Pin 5 | RA1 — Bidirectional I/O / analog input |
| Pin 6 | RA0 — Bidirectional I/O / analog input |
| Pin 7 | Vdd — Positive power supply |
| Pin 8 | Vss — Ground reference |
| Pin 9 | RB7 — Bidirectional I/O / ICSP data |
| Pin 10 | RB6 — Bidirectional I/O / ICSP clock |
| Pin 11 | RB5 — Bidirectional I/O / analog input |
| Pin 12 | RB4 — Bidirectional I/O / analog input |
| Pin 13 | RB3 — Bidirectional I/O / analog input |
| Pin 14 | RB2 — Bidirectional I/O / analog input |
| Pin 15 | RB1 — Bidirectional I/O / analog input |
| Pin 16 | RB0 — Bidirectional I/O / analog input / interrupt |
| Pin 17 | RC7 — Bidirectional I/O |
| Pin 18 | RC6 — Bidirectional I/O |
| Pin 19 | RC5 — Bidirectional I/O |
| Pin 20 | RC4 — Bidirectional I/O |
| Pin 21 | RC3 — Bidirectional I/O |
| Pin 22 | RC2 — Bidirectional I/O |
| Pin 23 | RC1 — Bidirectional I/O |
| Pin 24 | RC0 — Bidirectional I/O |
| Pin 25 | SEG0 — LCD segment drive |
| Pin 26 | COM0 — LCD common backplane |
| Pin 27 | COM1 — LCD common backplane |
| Pin 28 | EP — Exposed thermal pad - connect to Vss |
Typical Applications
PIC16LF1902-I/MV is suitable for 6 applications: Battery-Powered IoT Sensor Node, LCD Thermostat / White-Goods Front Panel, Industrial Remote Control / Handheld Terminal, Portable Medical Monitoring Device, Smart Meter / Utility Sub-Node, Consumer Appliance Control Board.
Battery-Powered IoT Sensor Node
The PIC16LF1902-I/MV is purpose-built for coin-cell or 2xAA battery IoT sensor nodes that must run for years on a single cell. Its nanoWatt XLP sleep current (sub-uA range per Microchip datasheet DS40001455F) lets the MCU spend >99% of its duty cycle in deep sleep while the internal 16 MHz oscillator wakes the core on interrupts for sensor sampling and radio toggling. With 3.5 KB Flash, 128 B SRAM and 11 ADC channels, the part comfortably fits a state-machine firmware plus a low-power sub-GHz or BLE driver stub.
Recommended
LCD Thermostat / White-Goods Front Panel
The PIC16LF1902-I/MV integrates up to 72 LCD segment drive, removing the need for an external LCD controller and shrinking BOM cost for white-goods panels and thermostats. The 25 mA source/sink I/O directly drives LED indicators without driver transistors, while the integrated charge-pump LCD bias generates the glass voltage from a 3 V rail. At 28-UQFN 4x4 mm, the package fits behind the LCD module and leaves room for a coin-cell backup battery on the same PCB.
Recommended
Industrial Remote Control / Handheld Terminal
Industrial remote controls and handheld terminals benefit from the PIC16LF1902-I/MV's 1.8-3.6 V wide supply and 25 mA I/O drive that powers IR LEDs and piezo buzzers directly. The enhanced mid-range 14-bit instruction set gives deterministic interrupt latency critical for IR protocol decoding (RC5, NEC), while the 10-bit ADC samples battery voltage and analog keys. The -40 °C to +85 °C industrial grade tolerates factory floor temperature swings without derating.
Recommended
Portable Medical Monitoring Device
Portable patient monitors, pill dispensers and single-use diagnostic devices use the PIC16LF1902-I/MV because its XLP sleep currents extend battery life past shelf-life targets while the 10-bit ADC handles temperature, battery monitor and bio-sensor front-end signals. The integrated 16 MHz oscillator removes external crystal failure modes that would otherwise reduce MTBF. The compact 28-UQFN 4x4 mm package fits inside a wristband or disposable enclosure.
Recommended
Smart Meter / Utility Sub-Node
Smart electricity, water and gas meters use the PIC16LF1902-I/MV as a low-cost display and sensing MCU, taking advantage of the integrated 11-channel ADC for multi-meter pulse counting and the LCD driver for kWh/Volume readouts. The nanoWatt XLP technology delivers the multi-year battery endurance required by sealed metering deployments. With the internal 16 MHz oscillator, BOM cost stays minimal in volume utility installations.
Recommended
Consumer Appliance Control Board
The PIC16LF1902-I/MV serves as the main control MCU in rice cookers, washing machines and small kitchen appliances where cost, BOM count and deterministic timing matter. The enhanced mid-range 8-bit core executes single-cycle instructions at 20 MHz for sub-microsecond PWM updates on motor drive signals, while the 25 mA I/O drives relays and triac optocouplers without driver stages. The integrated temperature indicator supports NTC-based over-temperature protection.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LF1902-I/MV — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LF1903-I/MV | PIC16LF1904-I/MV | PIC16LF18855-I/MV | PIC16LF1789-I/MV |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-UQFN (MV) 4x4 mm | 28-UQFN (MV) 4x4 mm - same | 28-UQFN (MV) 4x4 mm - same | 28-UQFN (MV) 4x4 mm - same | 28-UQFN (MV) 4x4 mm - same |
| Program Flash | 3.5 KB | 7 KB | 7 KB | 14 KB | 14 KB |
| Data SRAM | 128 B | 256 B | 256 B | 1 KB | 1 KB |
| LCD Segments | Up to 72 | Up to 96 | Up to 96 | Up to 120 | Up to 240 |
| ADC Channels | 11 ch, 10-bit | 11 ch, 10-bit | 14 ch, 10-bit | 17 ch, 10-bit | 15 ch, 12-bit |
| Max CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 32 MHz | 32 MHz |
| Internal Oscillator | 16 MHz | 16 MHz | 16 MHz | 32 MHz | 32 MHz |
Key Differentiators
- Smallest 28-UQFN variant in the PIC16LF1902/3 family (vs PIC16LF1903-I/MV)
- Lower cost and lower power than larger-memory siblings (vs PIC16LF18855-I/MV)
- Tighter LCD driver segment match for small displays (vs PIC16LF1789-I/MV)
Design Notes
The 28-UQFN (MV) 4x4 mm package uses an exposed thermal pad (EP) that must be soldered to a copper pour on the PCB, ideally tied to Vss. For battery-powered designs the dissipation is minimal (<50 mW), but for any application driving LEDs continuously the EP pad keeps junction temperature below 85 °C. Thermal via array under the pad (5-9 vias, 0.3 mm drill) reduces theta_JA by 30-40% versus no vias.
Place a 0.1 µF decoupling capacitor as close as possible to the Vdd pin (pin 7) and a bulk 1-10 µF tantalum or ceramic capacitor on the same Vdd net within 5 mm. Route the ICSP clock and data lines (RB6/RB7) with short, parallel traces to the debug header pads; avoid crossing them with high-current I/O nets to prevent programming glitches. Keep analog and digital grounds separated with a single-point tie at the Vss pin to minimize ADC noise.
Do not exceed Vdd > 3.6 V; the LF prefix explicitly defines the 1.8 V-3.6 V window and exceeding it will permanently damage the part. When using the internal oscillator, configure the IRCF fuses correctly or the system clock will run at the wrong speed. The MCLR/RA3 pin must be pulled high through a 10 kΩ resistor if not used as a reset, otherwise the device will stay in reset on every power-up. For in-circuit programming leave RB6/RB7 accessible or the firmware cannot be updated.
Compliance Information
RoHS and lead-free compliant per Microchip product page. Industrial temperature grade only - AEC-Q100 automotive grade not qualified for this specific MPN. Halogen-free per Microchip material declaration.
