PIC16LC774-I/P - 8-Bit MCU, 7KB OTP, 33 I/O, 40-PDIP | Microchip
MPN: PIC16LC774-I/P ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.36 | $4.36 |
| 10 | $3.93 | $39.30 |
| 100 | $3.62 | $362.00 |
| 500 | $3.18 | $1,590.00 |
| 1,000 | $2.85 | $2,850.00 |
PIC16LC774-I/P Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (ROM/Flash/OTP), data memory (RAM), and peripherals on one die. Within the semiconductor hierarchy, an MCU belongs to the broader class of microprocessors and embedded controllers, sitting between simple logic ICs and 32-bit application processors. The PIC16 family is Microchip's mid-range 8-bit line, known for its RISC architecture, single-cycle instruction execution (except branches), and a small instruction set of only 35 single-word instructions, making it well-suited for embedded control in cost-sensitive designs.
Key features of the PIC16LC774-I/P include 12-bit ADC resolution (the 'LC774 is one of the higher-pin-count PIC16 parts with on-chip analog), integrated peripherals such as USART, SSP (SPI/I2C), capture/compare/PWM modules, and two 8-bit timers plus one 16-bit timer. The 33 available I/O pins allow the device to drive multiple sensors, switches, and actuators concurrently, while the wide operating voltage range (typically 2.5 V to 5.5 V for the 'LC' low-voltage variant) supports both 3.3 V and 5 V designs.
The PIC16LC774 architecture is built around a Harvard-style RISC core with separate program and data buses, enabling most instructions to execute in a single instruction cycle (200 ns at 20 MHz). This deterministic timing, combined with hardware interrupt handling, makes the device predictable in real-time control loops. The on-chip 12-bit ADC and reference modules allow direct interface with analog sensors without external signal conditioning.
Typical applications include industrial process controllers, HVAC control boards, motor control subsystems, instrumentation front-ends, automotive body electronics (non-safety), and consumer appliance control panels. The 33 I/O count and 12-bit ADC make it a strong fit for systems that need many sensor inputs and moderate computational throughput.
When designing with this part, note that the 'I' suffix denotes the industrial temperature grade (-40C to +85C) and the 'P' suffix denotes PDIP packaging. OTP memory means the device can be programmed only once, so this part is intended for mature production designs rather than iterative prototyping - consider PIC16F variants for Flash-based in-field reprogrammability.
This page synthesizes distributor pricing, pin-compatible drop-in alternatives from Microchip's PIC16 family, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC16LC774-I/P — 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 PIC16LC774-I/P (same form factor and footprint) — differing in Core Architecture, Operating Temperature, Package, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F877A-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F874A-I/P
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16F77-I/P
✅ Drop-In✓ In Stock
$8.4 / Unit
View Datasheet →PIC16C77-20/P
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →PIC18F4520-I/P
✅ Drop-In✓ In Stock
$5.35 / Unit
View Datasheet →PIC16LC774-I/P Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit RISC (PIC16 mid-range) |
| Program Memory Size | 7 KB (4K x 14) OTP |
| RAM Size | 256 bytes |
| Number of I/O Pins | 33 |
| Maximum Clock Speed | 20 MHz |
| Oscillator Type | External |
| ADC Resolution | 12-bit (integrated) |
| Supply Voltage Range | 2.5 V to 5.5 V (LC low-voltage variant) |
| Operating Temperature Range | -40C to +85C (industrial) |
| Package / Case | 40-DIP (0.600 inch / 15.24 mm) |
| Mounting Type | Through-Hole |
| Instruction Set | 35 single-word instructions |
| Number of Timers | 2 x 8-bit, 1 x 16-bit |
| Peripherals | USART, SSP (SPI/I2C), CCP, 12-bit ADC |
| Packaging | Tube |
| MSL Level | Not applicable (through-hole) |
PIC16LC774-I/P Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (reset) input / programming voltage |
| Pin 2 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF+ — Port A bit 3 / Analog input 3 / VREF+ |
| Pin 6 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Pin 7 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | RE0/RD/AN5 — Port E bit 0 / Read control / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — Port E bit 1 / Write control / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — Port E bit 2 / Chip select / Analog input 7 |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 15 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer 1 oscillator output / clock input |
| Pin 16 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer 1 oscillator input / CCP2 |
| Pin 17 | RC2/CCP1 — Port C bit 2 / Capture Compare PWM 1 |
| Pin 18 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 — Port D bit 0 / Parallel Slave Port bit 0 |
| Pin 20 | RD1/PSP1 — Port D bit 1 / Parallel Slave Port bit 1 |
| Pin 21 | RD2/PSP2 — Port D bit 2 / Parallel Slave Port bit 2 |
| Pin 22 | RD3/PSP3 — Port D bit 3 / Parallel Slave Port bit 3 |
| Pin 23 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — Port C bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| Pin 26 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| Pin 27 | RD4/PSP4 — Port D bit 4 / Parallel Slave Port bit 4 |
| Pin 28 | RD5/PSP5 — Port D bit 5 / Parallel Slave Port bit 5 |
| Pin 29 | RD6/PSP6 — Port D bit 6 / Parallel Slave Port bit 6 |
| Pin 30 | RD7/PSP7 — Port D bit 7 / Parallel Slave Port bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply voltage |
| Pin 33 | RB0/INT — Port B bit 0 / External interrupt |
| Pin 34 | RB1 — Port B bit 1 |
| Pin 35 | RB2 — Port B bit 2 |
| Pin 36 | RB3 — Port B bit 3 |
| Pin 37 | RB4 — Port B bit 4 |
| Pin 38 | RB5 — Port B bit 5 |
| Pin 39 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — Port B bit 7 / ICSP data |
Typical Applications
PIC16LC774-I/P is suitable for 6 applications: Industrial Process Controller, HVAC Control Board, Motor Control Subsystem, Instrumentation Front-End, Automotive Body Electronics, Consumer Appliance Control.
Industrial Process Controller
The PIC16LC774-I/P suits industrial process controller boards where 33 I/O pins drive multiplexed sensor inputs, relay outputs, and HMI keypads. The 12-bit on-chip ADC delivers 4,096 steps of resolution (vs. 1,024 steps at 10-bit), enabling direct interface with 4-20 mA loop transmitters and bridge-type pressure transducers without external instrumentation amplifiers. The 20 MHz clock provides 5 MIPS of throughput, sufficient for PID loop calculations at 10 ms sample intervals. The wide 2.5-5.5 V supply range accepts both 3.3 V and 5 V rail designs commonly found in PLC backplanes, and the -40C to +85C industrial temperature grade ensures reliable operation in factory floor cabinets. The OTP memory prevents field firmware tampering, an advantage for process control systems where code integrity is a safety consideration.
Recommended
HVAC Control Board
In HVAC control boards, the PIC16LC774-I/P reads multiple analog temperature sensors via its 12-bit ADC, drives triac outputs for blower and compressor control via PWM, and communicates with thermostats through USART. The 33 I/O count easily accommodates the typical HVAC I/O requirement of 8-12 temperature zones, 4-6 relay outputs, and a serial link to the wall thermostat. The 12-bit ADC precision allows direct NTC thermistor linearization with minimal software overhead. Operating across -40C to +85C, the device handles unconditioned attic and outdoor unit environments. The 256-byte RAM supports small lookup tables for setpoint scheduling without external EEPROM, reducing BOM cost in volume HVAC production.
Recommended
Motor Control Subsystem
The PIC16LC774-I/P is well matched to BLDC and stepper motor control subsystems that need 6 PWM channels and quadrature encoder feedback. The integrated Capture/Compare/PWM (CCP) module delivers up to 10-bit PWM resolution at 20 kHz switching frequency, ideal for 3-phase inverter gate drivers. The 20 MHz instruction rate provides deterministic 50 microsecond current-loop update intervals, while the 33 I/O lines accommodate Hall sensors, encoder inputs, fault flags, and 6 gate drive signals simultaneously. The 12-bit ADC samples DC bus current and back-EMF with 1 mV precision at the MCU pin, enabling sensorless commutation algorithms in cost-sensitive appliance motors. Industrial temperature rating supports under-hood and outdoor deployments.
Recommended
Instrumentation Front-End
Bench-top instrumentation such as digital multimeters, lab power supplies, and data loggers benefit from the PIC16LC774-I/P's 12-bit ADC, 33 I/O count, and USART for PC connectivity. The 12-bit resolution provides 0.025% full-scale measurement accuracy, sufficient for 3.5-digit DMM designs without external ADC. The 33 I/O drive a 4x4 keypad matrix, 16x2 LCD interface, rotary encoder input, and parallel DAC bus for analog stimulus generation. The 256-byte RAM buffers measurement frames before USART transmission to a host PC at 115,200 bps. Industrial temperature rating ensures stable readings in lab environments with fluctuating ambient. OTP memory locks calibrated firmware against inadvertent field corruption.
Recommended
Automotive Body Electronics
Body electronics modules - window lift controllers, mirror position controllers, lighting controllers - use the PIC16LC774-I/P for non-safety in-cabin functions. The 33 I/O drive H-bridge motor drivers, LED arrays, and switch-matrix scan inputs without external mux ICs. The 12-bit ADC reads potentiometer wiper voltages for mirror position feedback with sub-1-degree angular resolution. The wide 2.5-5.5 V supply tolerates automotive load-dump transients when paired with a TVS-protected 12V-to-5V regulator. The industrial temperature grade handles cabin temperatures from -40C in winter to +85C in summer sun. Note that for safety-critical automotive applications, AEC-Q100 qualified parts like PIC16F877A-I/P variants are recommended instead.
Recommended
Consumer Appliance Control
Consumer appliances - washing machines, dishwashers, microwave ovens - deploy the PIC16LC774-I/P to consolidate user interface, motor control, and sensor processing on a single chip. The 12-bit ADC monitors water level, temperature, and humidity sensors with high accuracy. The 33 I/O handle 7-segment display driving, keypad scanning, and buzzer/relay outputs concurrently. The 20 MHz throughput runs state-machine control loops for wash cycles, drying profiles, and safety interlocks without external logic. The 256-byte RAM stores cycle definitions and user preferences. Industrial temperature rating supports appliance interiors that can reach 60-70C during operation. The OTP memory prevents unauthorized firmware cloning for brand protection.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC774-I/P — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F877A-I/P | PIC16F874A-I/P | PIC16F77-I/P | PIC16C77-20/P | PIC18F4520-I/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 40-DIP (0.600 inch) | 40-DIP - same | 40-DIP - same | 40-DIP - same | 40-DIP - same | 40-DIP - same |
| Program Memory | 7 KB OTP | 14 KB Flash | 14 KB Flash | 14 KB Flash | 7 KB EPROM | 32 KB Flash |
| RAM | 256 B | 368 B | 192 B | 368 B | 256 B | 1536 B |
| ADC Resolution | 12-bit | 10-bit | 10-bit | 10-bit | 12-bit | 10-bit |
| Max Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 40 MHz |
| Number of I/O | 33 | 33 | 33 | 33 | 33 | 36 |
| Memory Type | OTP | Flash | Flash | Flash | EPROM (windowed) | Flash |
| Lifecycle Status | NRND | Active | Active | Active | NRND | Active |
Key Differentiators
- Higher ADC resolution than Flash-based successors (vs PIC16F877A-I/P)
- Active Flash-based alternative in same package (vs PIC16F877A-I/P)
- 33 I/O with on-chip 12-bit ADC and USART (vs PIC16C77-20/P)
Design Notes
The PIC16LC774-I/P requires a decoupling capacitor of 100 nF ceramic placed within 5 mm of the VDD pin (pin 11 or pin 32). For designs with VDD traces longer than 25 mm, add a 10 uF tantalum or aluminum polymer bulk capacitor at the supply entry point. The LC low-voltage variant operates from 2.5 V to 5.5 V; if the application has a 5 V rail with +/-10% tolerance, ensure the regulator holds above 4.5 V under all load transients. Two VDD pins (11 and 32) and two VSS pins (12 and 31) are provided; both must be connected for proper operation, with the second pair used for digital switching noise isolation from analog VREF.
Because the PIC16LC774-I/P uses OTP program memory, firmware bugs cannot be field-corrected. For development, use a Flash-equipped sibling such as PIC16F877A-I/P with the same pinout for code validation, then port the final hex file to the OTP part for production. Code that exceeds the 7 KB (4K x 14) boundary will wrap or fail silently; verify final code size with the linker MAP file before committing to OTP programming. The MCLR pin (pin 1) requires a 10 kohm pull-up to VDD; leaving it floating causes intermittent resets in noisy environments.
For the 40-pin PDIP footprint, place bypass capacitors on the underside of the PCB directly beneath the MCU pins when possible, using vias to the ground plane to minimize loop inductance. Keep the OSC1/OSC2 traces short (under 10 mm) and guarded by a ground ring to reduce EMI susceptibility - this matters because the LC774's 12-bit ADC samples at the oscillator period, and clock jitter directly translates to ADC noise. For analog inputs AN0-AN7, route traces away from digital switching nodes (PORTD parallel slave port is a common noise source); use a ground guard ring around the analog input pin cluster if sampling precision below 1 LSB is required.
Compliance Information
RoHS and lead-free status not explicitly stated in the verified web data; marked as unknown pending datasheet verification. Not AEC-Q100 qualified; for automotive applications use PIC16F877A-I/P automotive variants.
