PIC16C774-I/L - 8-bit OTP MCU 7KB EPROM 12-bit ADC | Microchip
MPN: PIC16C774-I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.5 | $9.50 |
| 10 | $8.55 | $85.50 |
| 100 | $7.6 | $760.00 |
| 500 | $6.84 | $3,420.00 |
| 1,000 | $6.08 | $6,080.00 |
PIC16C774-I/L Overview
What is an 8-bit OTP microcontroller? An 8-bit microcontroller (MCU) is a small computer-on-a-chip with an 8-bit data path, ALU, program memory, RAM, and integrated peripherals such as timers and ADCs. OTP (One-Time Programmable) program memory uses EPROM cells that can be written only once via a programmer and cannot be erased, making OTP parts a low-cost option for production volumes. PIC16C-series devices are mid-range Microchip parts in the PIC microcontroller hierarchy: PIC10/12/16/18 -> PIC16C (mid-range, 14-bit instruction) -> PIC16C77x family -> PIC16C774 specifically.
Key features include 10 channels of 12-bit resolution Analog-to-Digital conversion (a notable upgrade over the 8-bit ADC of earlier PIC16C7x parts), a USART with addressable SPI/I2C support, two 8-bit timers plus one 16-bit timer with capture/compare/PWM, a Watchdog Timer, and dual analog comparators. The 12-bit ADC enables discrimination of smaller analog signal changes and eliminates the need for external precision analog front-end circuitry, simplifying sensor and instrumentation designs.
The PIC16C774-I/L uses an industry-standard PIC16C RISC pipeline with a 14-bit program word and Harvard architecture (separate program and data buses). The 12-bit successive-approximation ADC includes sample-and-hold, selectable acquisition time, and operates in sleep mode with the RC oscillator. Brown-out Reset and Power-on Reset are integrated, reducing external component count. The -I suffix denotes industrial temperature grade (-40C to +85C); the /L suffix denotes the 44-pin PLCC (windowed ceramic in the /JW variant) package.
Typical applications include industrial process control systems with multi-channel sensor acquisition, portable data loggers, automotive body and chassis subsystems (non-safety), instrumentation and measurement equipment, and educational/embedded training platforms. The 12-bit ADC and 33 I/O make it suitable for mixed-signal designs where moderate resolution and ample digital I/O are required.
Design considerations include selecting the proper oscillator configuration (HS, XT, LP, RC), adding 0.1 uF decoupling near VDD pins, and routing analog and digital grounds to a single point. For high-ADC-resolution designs, place the analog supply trace away from switching nodes. OTP memory means firmware changes require a new device, so production code must be fully validated before programming. For in-circuit reprogrammability consider the flash-based PIC16F877 family as a modern alternative.
Drop-in alternatives for PIC16C774-I/L — 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 PIC16C774-I/L (same form factor and footprint) — differing in Operating Temperature, Package, Timers, MSL Level, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C774/JW
✅ Drop-In✓ In Stock
$10.2 / Unit
View Datasheet →PIC16C774/L
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →PIC16C774-E/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C77-20I/L
✅ Drop-In✓ In Stock
$4.1 / Unit
View Datasheet →PIC16F77-I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C774-I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16C 8-bit RISC (Harvard) |
| Program Memory | 7 KB (4K x 14) OTP EPROM |
| Data RAM | 256 bytes |
| Maximum Clock Speed | 20 MHz |
| Instruction Cycle Time | 200 ns |
| Instruction Set | 35 single-word instructions |
| Supply Voltage | 4 V to 5.5 V |
| I/O Pins | 33 digital I/O |
| ADC | 10 channels, 12-bit resolution |
| Timers | 2 x 8-bit Timer0/Timer2, 1 x 16-bit Timer1 with CCP |
| Communication | USART (SPI/I2C master/slave mode) |
| Analog Comparators | 2 |
| Watchdog Timer | Yes (with on-chip dedicated WDT oscillator) |
| Operating Temperature | -40 C to +85 C (Industrial grade) |
| Package | 44-pin PLCC (16.59 x 16.59 mm), through-hole J-lead |
| Mounting Type | Surface Mount (PLCC socket compatible) |
| MSL Level | 1 (unlimited floor life, non-hermetic ceramic windowed family) |
PIC16C774-I/L Pin Configuration
| Pin 1 | MCLR — Master Clear (Reset) input, active low |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input channel 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input channel 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input channel 2 |
| Pin 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / VREF+ |
| Pin 6 | RA4/AN4 — PORTA bit 4 / Analog input channel 4 |
| Pin 7 | RA5/AN5 — PORTA bit 5 / Analog input channel 5 |
| Pin 8 | VSS — Ground reference |
| Pin 9 | OSC1 — Crystal/oscillator input |
| Pin 10 | OSC2 — Crystal/oscillator output |
| Pin 11 | VDD — Positive supply voltage (4-5.5 V) |
| Pin 12 | RC0 — PORTC bit 0 |
| Pin 13 | RC1 — PORTC bit 1 |
| Pin 14 | RC2 — PORTC bit 2 |
| Pin 15 | RC3 — PORTC bit 3 |
| Pin 16 | RC4 — PORTC bit 4 |
| Pin 17 | RC5 — PORTC bit 5 |
| Pin 18 | RC6 — PORTC bit 6 / TX (USART) |
| Pin 19 | RC7 — PORTC bit 7 / RX (USART) |
| Pin 20 | VSS — Ground reference |
| Pin 21 | RD0 — PORTD bit 0 |
| Pin 22 | RD1 — PORTD bit 1 |
| Pin 23 | RD2 — PORTD bit 2 |
| Pin 24 | RD3 — PORTD bit 3 |
| Pin 25 | RD4 — PORTD bit 4 |
| Pin 26 | RD5 — PORTD bit 5 |
| Pin 27 | RD6 — PORTD bit 6 |
| Pin 28 | RD7 — PORTD bit 7 |
| Pin 29 | VSS — Ground reference |
| Pin 30 | VDD — Positive supply voltage (4-5.5 V) |
| Pin 31 | VSS — Ground reference |
| Pin 32 | RE0/AN6 — PORTE bit 0 / Analog input channel 6 |
| Pin 33 | RE1/AN7 — PORTE bit 1 / Analog input channel 7 |
| Pin 34 | RE2/AN8 — PORTE bit 2 / Analog input channel 8 |
| Pin 35 | RE3/AN9 — PORTE bit 3 / Analog input channel 9 |
| Pin 36 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 37 | RB1 — PORTB bit 1 |
| Pin 38 | RB2 — PORTB bit 2 |
| Pin 39 | RB3 — PORTB bit 3 |
| Pin 40 | RB4 — PORTB bit 4 |
| Pin 41 | RB5 — PORTB bit 5 |
| Pin 42 | RB6 — PORTB bit 6 / ICSP clock |
| Pin 43 | RB7 — PORTB bit 7 / ICSP data |
| Pin 44 | VDD — Positive supply voltage (4-5.5 V) |
Typical Applications
PIC16C774-I/L is suitable for 6 applications: Industrial Process Control Systems, Portable Data Logger, Instrumentation and Measurement Equipment, Educational and Embedded Training Platforms, Automotive Body and Comfort Electronics, Motor Control and PWM Drive.
Industrial Process Control Systems
The PIC16C774-I/L fits industrial process control boards where multi-channel sensor acquisition and moderate CPU throughput are required. Its 10-channel 12-bit ADC enables direct connection to thermocouples (via amplifiers), 4-20 mA current loops (via shunt), and pressure/flow transducers without external precision ADCs. The 33 I/O pins drive relays, solenoids, and indicator LEDs, while the USART links to operator panels. Industrial -40 to +85 C operation matches factory-floor environments. The 7 KB OTP memory holds supervisory loops, PID control, and alarm logic; the PIC16C77-20I/L upgrade path preserves the same PLCC-44 footprint for component EOL contingency.
Recommended
Portable Data Logger
The PIC16C774-I/L serves portable battery-powered data loggers that sample analog signals over long periods. The 12-bit ADC provides sufficient resolution for temperature, humidity, and pressure logging; the 256-byte RAM holds buffering between flash writes; and Sleep mode with Watchdog Timer enables microamp-level idle current. Operating from 4-5.5 V allows direct 4xAA battery connection with voltage-divider sensing. The OTP memory ensures firmware stability (no accidental writes in field). For new designs the flash-based PIC16F77-I/L offers equivalent functionality with field upgradability.
Recommended
Instrumentation and Measurement Equipment
The PIC16C774-I/L suits bench-top and panel-mount measurement instruments where 12-bit analog resolution simplifies the analog front-end. Its 10 ADC channels scan multiple sensors sequentially; the 16-bit Timer1 with capture/compare accurately timestamps events; and the USART (SPI/I2C) connects to display drivers and digital peripherals. The industrial temp grade and 5 V supply align with conventional analog signal chains. The USART enables command/response communication with PC hosts. Engineers can replace the OTP part with the flash-based PIC16F77-I/L during development iteration.
Recommended
Educational and Embedded Training Platforms
Universities and training centers use the PIC16C774-I/L (in /JW windowed-ceramic variant) as the heart of microcontroller teaching kits. The 12-bit ADC provides meaningful analog exercises, the 33 I/O drives extensive GPIO labs, and the documented PIC16C instruction set supports assembly and C programming courses. Erasable UV window allows students to iteratively rewrite code and experiment. The 20 MHz clock rate introduces real-time constraints. After prototype development on /JW, students port validated code to the production /L OTP part.
Recommended
Automotive Body and Comfort Electronics
Pre-CAN automotive subsystems (body control, climate, lighting, seat control) historically used the PIC16C774-I/L's combination of 33 I/O, 12-bit ADC for sensor inputs, and PWM timers for motor/LED dimming. The industrial temperature grade covers most body-electronics compartments (cabin). For under-hood or safety-critical applications, migrate to AEC-Q100 qualified parts. The 5 V supply and 44-pin PLCC footprint match legacy automotive PCB designs; the PIC16C77-20I/L or PIC18F family provides software-compatible migration paths.
Recommended
Motor Control and PWM Drive
The PIC16C774-I/L handles small DC motor and stepper drive subsystems using its 16-bit Timer1 with Capture/Compare/PWM and the 8-bit Timer2 for complementary PWMs. The 12-bit ADC reads current-sense amplifiers and back-EMF for closed-loop control; the 33 I/O drives H-bridge gate signals, direction lines, and fault inputs. Operating from 5 V with industrial temp grade suits industrial small-motor control boards. For higher-power systems, add external gate drivers (e.g., TC4427) - the MCU's 25 mA I/O is sufficient for low-side logic-level FETs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C774-I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C774/JW | PIC16C774/L | PIC16C774-E/L | PIC16C77-20I/L | PIC16F77-I/L |
|---|---|---|---|---|---|---|
| Package | 44-pin PLCC (16.59 x 16.59 mm) | 44-pin CERDIP windowed (same pinout via adapter) | 44-pin PLCC (same) | 44-pin PLCC (same) | 44-pin PLCC (same) | 44-pin PLCC (same) |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | 7 KB (4K x 14) OTP EPROM | 7 KB OTP EPROM (windowed UV-erasable) | 7 KB OTP EPROM | 7 KB OTP EPROM | 8 KB OTP EPROM | 7 KB Flash (reprogrammable) |
| Maximum Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| ADC Resolution | 12-bit (10 channels) | 12-bit (10 channels) | 12-bit (10 channels) | 12-bit (10 channels) | 8-bit (10 channels) | 8-bit (10 channels) |
| Operating Temperature | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | -40 C to +125 C (Extended) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Reprogrammability | OTP (one-time only) | OTP (UV-erasable for prototyping) | OTP (one-time only) | OTP (one-time only) | OTP (one-time only) | Flash (10K erase/write cycles) |
Key Differentiators
- 10-channel 12-bit ADC vs 8-bit on most mid-range PICs (vs PIC16C77-20I/L)
- OTP memory with flash-compatible successor available (vs PIC16F77-I/L)
- Industrial temperature grade standard, not commercial-only (vs PIC16C774/L)
Design Notes
Place a 0.1 uF ceramic decoupling capacitor as close as possible to each VDD pin (pins 11, 30, 44) with a short trace to the corresponding VSS pins (8, 20, 29, 31). Add a bulk 10 uF tantalum or aluminum electrolytic capacitor near the supply entry point. For ADC accuracy, isolate analog VDD (if used) from digital VDD via a ferrite bead. The PIC16C774-I/L operates from 4 V to 5.5 V; below 4 V the brown-out reset may trigger and POR behavior is undefined.
OTP memory can be written only once - any code bug is permanent. Always prototype with the PIC16C774/JW (windowed ceramic) part which allows UV erasure, and validate all firmware (including bootloader, interrupts, and brown-out behavior) before committing to the OTP /L production device. The -I industrial temp grade (-40 to +85 C) is NOT suitable for under-hood automotive or safety-critical applications; for those use AEC-Q100 qualified parts. Brown-out Reset voltage threshold must be configured via the configuration bits and verified under worst-case supply conditions.
Use a 44-pin PLCC socket (e.g., 3M Textool or Aries) during development to allow device swapping between PIC16C774/JW (prototyping) and PIC16C774-I/L (production). For surface-mount production, solder the PLCC directly or use a PLCC-to-DIP adapter. Route the analog inputs (PORTA and PORTE) away from switching nodes (oscillator, PWM outputs) to minimize ADC crosstalk. Place the analog VREF decoupling (0.1 uF + 10 uF) near the RA3/AN3/VREF+ pin when using external voltage reference. Maintain solid ground plane under analog traces.
The 10-channel 12-bit ADC achieves best performance with acquisition time of at least 19.7 us (per datasheet) and a low-impedance source (less than 10 kohm). Add an op-amp buffer (e.g., MCP6022) for high-impedance sensors. The ADC voltage reference can be VDD (default) or an external source applied to RA3/AN3/VREF+. For 12-bit accuracy, use an external precision reference (e.g., MCP1541 4.096 V) rather than VDD. The ADC can operate in Sleep mode only when using the internal RC oscillator for the ADC clock.
Compliance Information
Compliance status not explicitly stated in verified web data. PIC16C774-I/L is a 44-pin PLCC OTP part from Microchip's mature PIC16C mid-range family; -I suffix indicates industrial -40 to +85 C grade. For automotive AEC-Q100 requirements, migrate to PIC18F or dsPIC33 families with explicit automotive qualification.
