PIC16LC77T-04I/PQ - 8-Bit 4MHz 14KB OTP MCU 44-MQFP | Microchip
MPN: PIC16LC77T-04I/PQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $11.5 | $11.50 |
| 10 | $10.35 | $103.50 |
| 100 | $9.2 | $920.00 |
| 500 | $8.05 | $4,025.00 |
| 1,000 | $7.15 | $7,150.00 |
PIC16LC77T-04I/PQ Overview
An OTP-based microcontroller is a type of embedded processor that stores program code in non-volatile one-time-programmable memory rather than flash; the code is written once during production or prototyping and cannot be erased, making OTP parts cost-optimized for high-volume mature products. As part of the PIC16C7X family, this device sits in the broader hierarchy: PIC16C77 -> PIC16C7X family -> PIC16CXX mid-range architecture -> 8-bit microcontroller -> embedded MCU -> semiconductor.
Key features include industrial temperature grade operation (-40C to +85C), low-power CMOS technology, and a 5V supply rail. The ADC subsystem provides 8 channels of 8-bit resolution for sensor interfacing, while the I2C/SPI/UART communication ports enable flexible connectivity with sensors, displays, and other MCUs.
The PIC16LC77T-04I/PQ uses a Harvard RISC architecture with separate program and data buses, an accumulator-based ALU, and an 8-level deep hardware stack. Its instruction set is highly orthogonal with single-cycle execution for most instructions (excluding branches), enabling predictable deterministic timing - ideal for real-time control loops. The 4MHz oscillator drives a four-phase internal clock, yielding a 1MHz instruction cycle rate. The OTP program memory supports ICSP (In-Circuit Serial Programming) for production-line programming.
Typical applications include industrial automation controllers, sensor signal conditioning interfaces, motor control front-ends, embedded data acquisition systems, and legacy 8-bit embedded designs. The wide I/O count (33 I/O) and integrated ADC make it suitable for distributed sensor nodes and HVAC controllers.
When designing with this part, ensure proper decoupling (100 nF + 10 uF bulk) close to VDD/VSS, use the ICSP pins for in-circuit programming, and verify brown-out and watchdog configuration bits during firmware bring-up. This page synthesizes distributor pricing, package-level drop-in alternatives, and practical design notes that are not consolidated in the manufacturer datasheet alone.
Drop-in alternatives for PIC16LC77T-04I/PQ — 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 PIC16LC77T-04I/PQ (same form factor and footprint) — differing in Core Architecture, Package, Program Memory Size, ADC, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC77T-04/PQ
✅ Drop-In✓ In Stock
$7.5 / Unit
View Datasheet →PIC16LC77T-04/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.45 / Unit
View Datasheet →PIC16LC773T-I/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.69 / Unit
View Datasheet →PIC16LC771T-I/SO
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.3 / Unit
View Datasheet →PIC16LC74BT-04I/PQ
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$10.5 / Unit
View Datasheet →PIC16LC77T-04I/PQ Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16CXX mid-range 8-bit RISC |
| Family | PIC16C7X |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 14 KB (8K x 14) |
| RAM Size | 368 bytes |
| Maximum CPU Frequency | 4 MHz |
| Instruction Cycle | 1 MHz (4 oscillator cycles per instruction) |
| Data Bus Width | 8-bit |
| I/O Pins | 33 |
| ADC | 8 channels, 8-bit resolution |
| Communication Interfaces | I2C, SPI, UART/USART |
| Timers | Timer1, Timer2 + WDT |
| PWM Channels | Yes (CCP module) |
| Supply Voltage | 5 V (typical PIC16LC range) |
| Operating Temperature | -40C to +85C (Industrial grade) |
| Package | 44-pin MQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant (Lead-free per manufacturer) |
PIC16LC77T-04I/PQ Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Pin 2 | RA0/AN0 — PortA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PortA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PortA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF+ — PortA bit 3 / Analog input 3 / ADC Vref+ |
| Pin 6 | RA4/T0CKI — PortA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PortA bit 5 / Analog input 4 / SPI Slave Select |
| Pin 8 | OSC1/CLKIN — Oscillator crystal input / external clock |
| Pin 9 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Pin 10 | RC0/T1OSO/T1CKI — PortC bit 0 / Timer1 oscillator output / Timer1 clock |
| Pin 11 | RC1/T1OSI/CCP2 — PortC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 12 | RC2/CCP1 — PortC bit 2 / CCP1 PWM output |
| Pin 13 | RC3/SCK/SCL — PortC bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA — PortC bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO — PortC bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK — PortC bit 6 / UART TX / clock |
| Pin 17 | RC7/RX/DT — PortC bit 7 / UART RX / data |
| Pin 18 | RD0/PSP0 — PortD bit 0 / Parallel Slave Port |
| Pin 19 | RD1/PSP1 — PortD bit 1 / Parallel Slave Port |
| Pin 20 | RD2/PSP2 — PortD bit 2 / Parallel Slave Port |
| Pin 21 | RD3/PSP3 — PortD bit 3 / Parallel Slave Port |
| Pin 22 | RD4/PSP4 — PortD bit 4 / Parallel Slave Port |
| Pin 23 | RD5/PSP5 — PortD bit 5 / Parallel Slave Port |
| Pin 24 | RD6/PSP6 — PortD bit 6 / Parallel Slave Port |
| Pin 25 | RD7/PSP7 — PortD bit 7 / Parallel Slave Port |
| Pin 26 | VSS — Ground |
| Pin 27 | VDD — Positive supply voltage (+5V) |
| Pin 28 | RB0/INT — PortB bit 0 / External interrupt |
| Pin 29 | RB1 — PortB bit 1 |
| Pin 30 | RB2 — PortB bit 2 |
| Pin 31 | RB3 — PortB bit 3 |
| Pin 32 | RB4 — PortB bit 4 |
| Pin 33 | RB5 — PortB bit 5 |
| Pin 34 | RB6/PGC — PortB bit 6 / ICSP clock |
| Pin 35 | RB7/PGD — PortB bit 7 / ICSP data |
| Pin 36 | RE0/RD/AN5 — PortE bit 0 / Read strobe / Analog input 5 |
| Pin 37 | RE1/WR/AN6 — PortE bit 1 / Write strobe / Analog input 6 |
| Pin 38 | RE2/CS/AN7 — PortE bit 2 / Chip select / Analog input 7 |
| Pin 39 | AVDD — Analog supply voltage |
| Pin 40 | AVSS — Analog ground |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16LC77T-04I/PQ is suitable for 7 applications: Industrial Automation Controllers, Sensor Signal Conditioning Interfaces, HVAC Control Systems, Embedded Data Acquisition Modules, Motor Control Front-Ends, Legacy Embedded Replacement Boards, Consumer Appliance Control.
Industrial Automation Controllers
The PIC16LC77T-04I/PQ fits industrial PLC and process-controller designs because its 33 I/O pins directly drive sensor arrays and actuator relays without external mux logic, while the integrated 8-channel 8-bit ADC ingests analog process variables (temperature, pressure, flow) at typical sensor bandwidths of a few hundred Hz. The industrial -40C to +85C temperature grade matches factory-floor environments, and the OTP memory suits mature, code-finalized products where firmware revisions are infrequent. Compared to a discrete logic implementation, the LC77 reduces BOM count by integrating ADC, timers, and three serial ports in one 44-MQFP package. Designers can leverage CCP PWM for valve or motor control, UART for HMI panel links, and I2C for digital sensor expansion.
Recommended
Sensor Signal Conditioning Interfaces
The PIC16LC77T-04I/PQ is well matched to multi-sensor interface boards because its 8-channel 8-bit ADC supports up to eight analog inputs (thermistor bridges, photodiodes, strain gauges) at a sampling rate appropriate for low-frequency process variables, while its I2C/SPI/UART ports daisy-chain to external digital sensors (accelerometers, EEPROM, displays). The OTP memory keeps the BOM cost low for high-volume sensor modules where firmware is locked at production. The 33 I/O lines drive indicator LEDs, relay coils, and keypad matrices directly. The 4 MHz CPU with 1 MIPS instruction rate executes linearization, averaging, and threshold-detection algorithms in real time without an external DSP.
Recommended
HVAC Control Systems
Commercial HVAC controllers benefit from the PIC16LC77T-04I/PQ because the 33 I/O count interfaces directly with multiple temperature/humidity sensors, fan relays, damper actuators, and a wall-mounted display, while the integrated ADC reads 0-10V setpoint analog inputs without external converters. The CCP module generates PWM signals for variable-speed fan motor control, and the UART port communicates with the building management system (BMS) gateway. The OTP memory and 44-MQFP package suit the high-volume, mature firmware nature of HVAC products. Industrial temperature grade supports rooftop and mechanical-room installations.
Recommended
Embedded Data Acquisition Modules
The PIC16LC77T-04I/PQ suits stand-alone data loggers because its 8-channel ADC samples up to eight analog signals at the 4 MHz CPU rate (with appropriate prescaler), while its UART transmits logged data to a host PC at 9600-115200 bps. The 368 bytes of RAM buffer samples between UART transmissions, and the I2C port reads external RTC and EEPROM for time-stamped logging. The industrial temperature range supports outdoor or cabinet-mounted installations. The OTP-based architecture delivers low per-unit cost at volume, ideal for multi-channel sensor pods deployed across factory floors or agricultural monitoring sites.
Recommended
Motor Control Front-Ends
The PIC16LC77T-04I/PQ functions as a motor-control front-end MCU because its CCP module delivers PWM to MOSFET gate drivers at typical switching frequencies of a few kHz, while its ADC samples motor current/voltage feedback for closed-loop speed or torque control. The 33 I/O drive H-bridge enable lines, brake signals, and fault indicators directly. Three serial ports (UART, SPI, I2C) interface to encoder feedback ICs and a higher-level system controller. The 4 MHz instruction rate executes PI control loops at sub-millisecond update rates suitable for small DC and stepper motor applications.
Recommended
Legacy Embedded Replacement Boards
The PIC16LC77T-04I/PQ is commonly used to sustain legacy 8-bit embedded products where the original PIC16C7X firmware is mature and unchanged, and where re-validation costs of migrating to a new MCU outweigh the BOM savings of a flash part. The 44-MQFP footprint matches older reference designs, allowing direct PCB drop-in without layout rework. OTP memory ensures code is locked at production, eliminating the risk of field firmware corruption. This application suits medical, aerospace, and industrial control boards certified under older standards where design re-qualification is costly.
Recommended
Consumer Appliance Control
The PIC16LC77T-04I/PQ integrates well into consumer appliance controllers (washing machines, dishwashers, microwave ovens) because its 33 I/O drive keypads, seven-segment displays, indicator LEDs, and triac-trigger outputs directly, while the ADC reads water level, temperature, and humidity sensors. The CCP PWM regulates motor speed for variable-load appliances. OTP memory provides low BOM cost at consumer volumes where firmware is finalized during product qualification. The 44-MQFP package and industrial temperature grade support the harsh thermal and vibration environment of consumer appliances during their multi-year service life.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC77T-04I/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC77T-04/PQ | PIC16LC77T-04/L | PIC16LC773T-I/SO |
|---|---|---|---|---|
| Package | 44-MQFP (10x10 mm) | 44-MQFP - same | 44-PLCC - cross-package | 28-SOIC - cross-package |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 14 KB OTP | 14 KB OTP | 14 KB OTP | 7 KB OTP |
| RAM | 368 bytes | 368 bytes | 368 bytes | 256 bytes |
| Max CPU Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| I/O Pins | 33 | 33 | 33 | 22 |
| ADC Resolution | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 12-bit, 6 channels |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| Memory Type | OTP (write-once) | OTP | OTP | OTP |
Key Differentiators
- Industrial temperature grade with 33 I/O and integrated ADC (vs PIC16LC77T-04/L (PLCC-44))
- Wide industrial -40C to +85C operating range (vs PIC16LC77T-04/PQ (Commercial temp grade))
- Tap-and-reel packaging for high-volume SMT assembly (vs PIC16LC77-04I/PQ (tray-shipped))
Design Notes
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pin (pin 27) and VSS pin (pin 26), plus a 10 uF bulk capacitor at the board supply entry. For analog supply, decouple AVDD (pin 39) and AVSS (pin 40) with a separate 100 nF + 10 uF pair to keep ADC readings clean. Use star-ground topology connecting digital GND, analog GND, and chassis GND at a single point near the IC. Estimated steady-state current at 4 MHz with all peripherals off is approximately 2-5 mA per the PIC16C7X datasheet; add at least 30% headroom when sizing the regulator.
Route the oscillator traces (OSC1 pin 8, OSC2 pin 9) as short as possible (under 10 mm), surrounded by ground guard traces, and keep them away from high-current switching lines. Place the crystal/resonator within 5 mm of the MCU pins and use ground copper pour on the top layer under the oscillator. For the 44-MQFP package, route all I/O signals on inner layers with via fanout to outer pads, and keep the exposed pad area below the IC clean of vias to avoid solder wicking. Estimate a 4-layer PCB with 1 oz copper for adequate thermal dissipation.
The PIC16LC77T-04I/PQ uses OTP memory - once programmed, the code cannot be erased or rewritten. This means any firmware bug shipped to production is permanent, so fully validate code on a flash-based equivalent (e.g., PIC16F877-I/PQ) before committing to OTP production programming. Configure the MCLR pin (pin 12) with a proper RC delay or supervisor circuit; leaving MCLR floating can cause spurious resets. Always set the brown-out reset (BOR) and watchdog timer (WDT) configuration bits during programming, and verify them with a programmer read-back before OTP commitment.
Assign analog inputs (AN0-AN7 on PortA and PortE) to pins physically separated from switching signals or PWM outputs to reduce ADC noise coupling. Keep analog traces short and surround them with ground pour. The CCP1 PWM output (RC2/CCP1, pin 13) should drive its gate-driver or LED through a series resistor to limit peak current. Estimated: at 20 MHz CCP PWM, peak current into a 50 pF load is approximately 100 mA - design your trace to handle this with appropriate width.
Compliance Information
RoHS compliant per Microchip product page and multiple distributor listings (digi-key.com, Microchip USA, Jotrin). Lead-free finish per RoHS directive. Halogen-free status not explicitly stated in verified data. Not AEC-Q100 qualified - this is an industrial-grade MCU, not automotive.
