PIC16F818T-I/MLTSL - 8-bit MCU 20MHz 1.75KB FLASH 28-QFN | Microchip
MPN: PIC16F818T-I/MLTSL β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.34 | $234.00 |
| 500 | $2.07 | $1,035.00 |
| 1,000 | $1.85 | $1,850.00 |
PIC16F818T-I/MLTSL Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory (Flash), volatile working memory (RAM), and a configurable set of peripherals (timers, ADC, communication blocks) into one package. Within the broader taxonomy, the PIC16F818 belongs to the 8-bit MCU family within the microcontrollers product category, which sits at the heart of embedded systems hierarchy: 8-bit MCU -> microcontroller -> embedded processor -> integrated circuit -> semiconductor. Low-cost PIC16-series devices like this one dominate cost-sensitive consumer, appliance, sensor and hobby applications where sophisticated processing power is not required.
The PIC16F818 stands out for its nanoWatt power-management technology and 35 single-word instructions, which simplify firmware and reduce code footprint. Internal oscillator calibration at 8 MHz eliminates the need for an external crystal in many designs, cutting BOM cost, while the 10-bit ADC and two analog comparators on-chip handle sensor conditioning directly.
Architecturally, the device is built on an enhanced Harvard 14-bit instruction word design with a 200 ns instruction cycle, supporting in-circuit serial programming (ICSP) and nanoWatt sleep modes down to a few microamperes. Industrial peripherals include the Master Synchronous Serial Port (MSSP) supporting SPI and I2C master/slave modes.
Typical applications include small home appliances (coffee makers, blenders), battery-powered sensor nodes, automotive interior accessories, white goods, power-tool controllers, and remote controls. The exposed thermal pad (QFN EP) provides solid thermal performance in continuous 20 MHz operation, while the small 6x6 mm footprint suits miniaturized designs.
Designers should note that, although the device has an internal 8 MHz oscillator, an external crystal can be added for higher accuracy or higher clock speeds up to 20 MHz. The TSSOP/PDIP/QFN variants of the PIC16F818 family are software- and pin-compatible with the PIC16F819 (which doubles the Flash and adds more peripherals), allowing code portability.
This page combines verified distributor pricing, drop-in alternatives, and practical PCB design notes that go beyond the manufacturer datasheet. PIC16F818T-I/MLTSL is orderable today from major distributors in tape-and-reel, with the surface-mount QFN landed-pattern suitable for high-volume placement lines.
Drop-in alternatives for PIC16F818T-I/MLTSL β 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 PIC16F818T-I/MLTSL (same form factor and footprint) β differing in ADC, Core Architecture, Internal Oscillator, Package, Program Memory (Flash).
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16F818T-I/ML
β Drop-Inπ Reference alternative (not in catalog)
PIC16F818T-E/ML
β Drop-Inπ Reference alternative (not in catalog)
PIC16F818T-I/SO
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PIC16F818-I/ML
β Drop-Inβ In Stock
$2.18 / Unit
View Datasheet βPIC16F818T-I/MLTSL Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC (Harvard, 14-bit instruction word) |
| Program Memory (Flash) | 1.75 KB (1K x 14) |
| SRAM | 128 bytes |
| EEPROM | 128 bytes |
| Maximum CPU Speed | 20 MHz |
| Internal Oscillator | 8 MHz |
| I/O Pins | 16 |
| ADC | 10-bit |
| Analog Comparators | 2 |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Communication Interfaces | I2C, SPI (MSSP) |
| Package | 28-QFN (6x6 mm) with exposed pad |
| Operating Voltage | 2.0 V to 5.5 V |
| Operating Temperature | -40 C to +85 C (industrial, I-grade) |
| Power-Saving Modes | nanoWatt sleep modes |
| ICSP | Yes (In-Circuit Serial Programming) |
| Brown-out Reset | Yes |
| Instruction Set Size | 35 single-word instructions |
| Instruction Cycle Time | 200 ns at 20 MHz |
| RoHS Status | Compliant |
PIC16F818T-I/MLTSL Pin Configuration
| Pin 1 | RA2/AN2 β PORTA bit 2 / Analog channel 2 / CVREF |
| Pin 2 | RA3/AN3 β PORTA bit 3 / Analog channel 3 / VREF+ |
| Pin 3 | RA4/T0CKI β PORTA bit 4 / Timer0 clock input (open-drain output) |
| Pin 4 | RA5/AN4 β PORTA bit 5 / Analog channel 4 / SS (slave select) |
| Pin 5 | VSS β Ground reference |
| Pin 6 | RA7 β PORTA bit 7 (digital only, RB3 alternate) |
| Pin 7 | RA6 β PORTA bit 6 (digital only) |
| Pin 8 | OSC1/RA1 β Crystal/Resonator input or PORTA bit 1 |
| Pin 9 | OSC2/RA0 β Crystal/Resonator output or PORTA bit 0 |
| Pin 10 | RC0 β PORTC bit 0 |
| Pin 11 | RC1 β PORTC bit 1 |
| Pin 12 | RC2 β PORTC bit 2 |
| Pin 13 | RC3 β PORTC bit 3 |
| Pin 14 | RC4 β PORTC bit 4 / SDA on MSSP I2C mode |
| Pin 15 | RC5 β PORTC bit 5 / SDO on MSSP SPI mode |
| Pin 16 | RC6 β PORTC bit 6 |
| Pin 17 | RC7 β PORTC bit 7 |
| Pin 18 | RB7 β PORTB bit 7 |
| Pin 19 | RB6 β PORTB bit 6 |
| Pin 20 | RB5 β PORTB bit 5 |
| Pin 21 | RB4 β PORTB bit 4 |
| Pin 22 | RB3 β PORTB bit 3 |
| Pin 23 | RB2 β PORTB bit 2 |
| Pin 24 | RB1 β PORTB bit 1 |
| Pin 25 | RB0/INT β PORTB bit 0 / external interrupt |
| Pin 26 | VDD β Positive supply (2.0 V to 5.5 V) |
| Pin 27 | MCLR/VPP β Master Clear reset (active low) / ICSP programming voltage |
| Pin 28 | RA7/OSC1 β Alternate function, see datasheet section 1 |
| Pin EP | Exposed Pad β Thermal pad, must be soldered to PCB pad for thermal relief |
Typical Applications
PIC16F818T-I/MLTSL is suitable for 7 applications: Small Home Appliances, Sensor Node / IoT Edge, Automotive Interior Accessories, Remote Control Handhelds, Power Tools and Drives, White Goods Control Boards, Battery Charger Front-Ends.
Small Home Appliances
The PIC16F818T-I/MLTSL's 35-instruction set and 1.75 KB Flash fit typical 8-bit tasks needed for blender controls, coffee machines and toaster-oven timers. Its 16 GPIO bit-bang relays and triacs, plus the 10-bit ADC read thermistor sensing in real time. With nanoWatt sleep current under 1 uA, standby consumption for Energy-Star-rated white goods stays within budget. The exposed-pad 28-QFN provides thermal headroom when driving switched-mode power stages.
Recommended
Sensor Node / IoT Edge
Industrial-grade operation from -40C to +85C plus nanoWatt sleep modes makes the PIC16F818T-I/MLTSL ideal for battery-powered sensor modules reporting periodic I2C temperature or humidity samples. The internal 8 MHz oscillator avoids a crystal, shrinking BOM, while the 10-bit ADC digitises analog sensors directly. Four interrupt sources wake the core in microseconds, extending battery life to years on a single coin cell in dense edge networks.
Recommended
Automotive Interior Accessories
While this I-grade part does not carry AEC-Q100, the die family is well established for non-safety automotive interior loads such as ambient lighting, USB chargers or interior LED controllers. The 16 I/O ports drive multiple LED chains via PWM, and the MSSP block commands LED driver ICs over SPI. The QFN package provides reliable thermal performance at +85C ambient in dashboard mounting.
Recommended
Remote Control Handhelds
With 1.75 KB Flash and 35-instructions, the PIC16F818T-I/MLTSL easily fits IR remote control firmware with debouncing, protocol encoding and sleep-wake IR. The 20 MHz CPU cycle 200 ns is plenty for software-implemented Manchester or NEC IR protocols. nanoWatt sleep curtails quiescent current for shelf-life, and 128 bytes of EEPROM stores pairing codes that survive battery swaps.
Recommended
Power Tools and Drives
Brushless DC (BLDC) motor controllers up to about 50 W can use the PIC16F818T-I/MLTSL as the supervisory MCU, with the 10-bit ADC reading shunt current, the analog comparators providing zero-crossing detection and PWM driving the gate driver through PORTB. The MSSP configures EEPROM motor-parameter storage. Industrial -40C to +85C operation tolerates garage and outdoor environments.
Recommended
White Goods Control Boards
The PIC16F818T-I/MLTSL fits washing-machine, dishwasher and microwave user-interface boards where the MCU drives LED/LCD displays, reads capacitive touch keys via the analog comparators, and manages compressor relays. The 10-bit ADC reads water level and NTC temperature sensors, while SPI talks to LED-driver chips for status indication. Robustness against brown-out on motor-inrush events is provided by the on-chip brown-out reset.
Recommended
Battery Charger Front-Ends
For NiMH or lithium single-cell charger controllers, the PIC16F818T-I/MLTSL monitors cell voltage with its 10-bit ADC, drives a constant-current source via PWM, and logs temperature for safety. The MSSP-based I2C interface reads gas-gauge ICs, while EEPROM stores calibration constants. The exposed thermal pad of the 28-QFN package handles the moderate dissipation of the linear charge path.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F818T-I/MLTSL β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F818T-I/ML | PIC16F818T-E/ML | PIC16F818T-I/SO | PIC16F818-I/ML |
|---|---|---|---|---|---|
| Package | 28-QFN (6x6) with EP | 28-QFN (6x6) with EP - same | 28-QFN (6x6) with EP - same | 28-QFN (6x6) with EP - same | 28-QFN (6x6) with EP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Flash Program Memory | 1.75 KB (1K x 14) | 1.75 KB | 1.75 KB | 1.75 KB | 1.75 KB |
| Maximum CPU Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| SRAM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| EEPROM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Operating Temperature | -40C to +85C (I-grade) | -40C to +85C (I-grade) | -40C to +125C (E-grade) | -40C to +85C (I-grade) | -40C to +85C (I-grade) |
| ADC | 10-bit | 10-bit | 10-bit | 10-bit | 10-bit |
| I/O Pins | 16 | 16 | 16 | 16 | 16 |
| Reel/Packaging Suffix | MLTSL (tape & reel) | ML (tray default) | ML (tray default) | SO (tape & reel) | ML (tray default) |
Key Differentiators
- Industrial tape-and-reel MLTSL packaging (vs PIC16F818T-I/ML (tray default))
- Industrial temperature range I-suffix (vs PIC16F818T-E/ML (extended -40 to +125C))
- Internal 8 MHz oscillator with nanoWatt sleep (vs PIC16F818T-I/SO (same MCU, bare 28-QFN reel))
Design Notes
The 28-QFN exposed pad of PIC16F818T-I/MLTSL must be soldered to a copper pad on the PCB, ideally with thermal vias to a bottom-side copper pour, for thermal relief and ground continuity. Without this connection, the device may overheat at 20 MHz continuous operation and fail in long-term reliability tests. Keep the EP footprint at least 50% copper-fill for adequate heat-spreading.
Bypass VDD with a 0.1 uF ceramic capacitor placed within 5 mm of the VDD pin, with a second 10 uF bulk capacitor within 25 mm. The PIC16F818T-I/MLTSL draws < 1 mA active at 20 MHz and below 1 uA in sleep, but digital switching transients still require local decoupling for ADC accuracy. Place decoupling before the trace-length via junction to avoid impedance peaks.
Route the ICSP clock (RB6) and data (RB7) lines so they are not adjacent to switching signals or PWM outputs to avoid programming interference. Reserve ICSP test points near the ICSP header or as two 0.1-inch pads. MCLR requires a 10 kohm pull-up plus optional 100 nF capacitor to VPP timing per AC characteristics for clean reset.
Do not exceed 5.5 V on VDD or apply voltage to PORTA/PORTB pins beyond VDD + 0.3 V - this triggers latchup on the PIC16F818T-I/MLTSL. Do not skip the MCLR pull-up resistor; floating MCLR leads to random resets. When using the internal oscillator, calibrate OSCTUNE to the application temperature range, as default calibration is at 25C only.
When driving long cables or relays from PORTB, place a 100 ohm series resistor at the pin to dampen ringing. For SPI runs > 50 mm, lower the clock to under 1 MHz or add a series resistor on the clock line. The MSSP block supports both SPI mode 0,0 and 1,1 - verify the slave component's required mode during configuration-word setup.
Compliance Information
RoHS-compliant per Microchip product page. Industrial grade (I-suffix) -40C to +85C; not AEC-Q100 qualified. For automotive applications, use PIC16F819 or similar AEC-qualified Microchip MCU.
