PIC16C77T-04E/L - 8-bit 4MHz OTP MCU 14KB 44-PLCC | Microchip
MPN: PIC16C77T-04E/L β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.5 | $18.50 |
| 10 | $16.2 | $162.00 |
| 100 | $13.85 | $1,385.00 |
| 500 | $11.4 | $5,700.00 |
| 1,000 | $9.75 | $9,750.00 |
PIC16C77T-04E/L Overview
An 8-bit OTP microcontroller is a single-chip computer that executes one instruction on 8-bit data words and stores its program in non-erasable (one-time programmable) ROM. Within the broader taxonomy, the PIC16C77 belongs to the 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC hierarchy. The 14-bit instruction word places it in Microchip's mid-range architecture family, between the baseline 12-bit core and the enhanced 16-bit core, balancing code density with peripheral integration.
Key features of the PIC16C77T-04E/L include integrated 8-bit A/D converter (typically 8 channels), a USART for serial communication, three timer/counter modules, a watchdog timer with on-chip RC oscillator, power-on reset, brown-out detection, and an operating voltage range of 4.0 V to 5.5 V. The wide 16 I/O ports (Vyrian listing) and 33 total I/O lines (per datasheet) allow direct connection to keypads, displays, sensors, and motor drivers without external glue logic.
Architecturally, the PIC16C77T-04E/L uses a Harvard RISC core with separate program and data buses, allowing instruction fetch and data access to occur in a single cycle. The 4 MHz oscillator yields a 1 microsecond instruction cycle, sufficient for real-time control loops in motor drives, instrumentation, and automotive body controllers. Code protection fuses prevent unauthorized memory read-out, critical for OEM intellectual-property security.
Typical applications include industrial automation controllers, automotive body and climate modules, instrumentation front-ends, security and access control panels, and embedded control subsystems where a proven mid-range 8-bit core and through-hole-compatible PLCC footprint are preferred over modern QFN surface-mount devices.
When designing with this part, place a 0.1 microfarad decoupling capacitor close to VDD and use a 4 MHz crystal with two 22 pF load capacitors. The OTP memory means firmware must be fully validated before programming; consider a Flash-based PIC16F877A for prototypes and a windowed CERDIP variant for development with UV erasure.
This page synthesizes verified distributor inventory, current pricing tiers, drop-in Microchip PIC16C7X family alternatives, and practical design notes not collected on a single OEM datasheet page.
Drop-in alternatives for PIC16C77T-04E/L 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 PIC16C77T-04E/L (same form factor and footprint) β differing in Core Architecture, Program Memory Type, Timers, I/O Pins, Instruction Cycle Time.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16F877A-I/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16F877AT-I/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C77-04E/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16C77-04I/L
β Drop-Inβ In Stock
$6.1 / Unit
View Datasheet βPIC16F877A-I/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C77-10E/L
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$9.85 / Unit
View Datasheet βPIC16C77T-04E/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16C 8-bit RISC (Harvard) |
| Program Memory Size | 14 KB (8K x 14-bit words) OTP |
| Data RAM | 368 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 1 microsecond at 4 MHz |
| Supply Voltage (VDD) | 4.0 V to 5.5 V |
| I/O Pins | 33 (16 ports per simplified listing) |
| A/D Converter | 8-bit, multi-channel (8 channels typical) |
| Timers | 3 x Timer/Counter modules |
| Communication | USART (SCI/SPI) |
| Watchdog Timer | Yes, with on-chip RC oscillator |
| Brown-out Reset / POR | Yes |
| Program Memory Type | OTP (One-Time Programmable) UVPROM |
| Operating Temperature Grade | Automotive / Extended (E suffix) |
| Package | 44-pin PLCC (J-Lead, 16.59 x 16.59 mm), windowed CERDIP-compatible |
| Mounting Type | Surface Mount (PLCC socket compatible) |
PIC16C77T-04E/L Pin Configuration
| Pin 1 | RA2/AN2 β PORTA bit 2 / Analog input channel 2 |
| Pin 2 | RA3/AN3/VREF+ β PORTA bit 3 / Analog input 3 / A/D reference positive |
| Pin 3 | RA4/T0CKI β PORTA bit 4 / Timer 0 clock input (open-drain) |
| Pin 4 | RA5/AN4/SS β PORTA bit 5 / Analog input 4 / SPI Slave Select |
| Pin 5 | RE0/RD/AN5 β PORTE bit 0 / Read control for parallel slave port / Analog input 5 |
| Pin 6 | RE1/WR/AN6 β PORTE bit 1 / Write control for parallel slave port / Analog input 6 |
| Pin 7 | RE2/CS/AN7 β PORTE bit 2 / Chip Select for parallel slave port / Analog input 7 |
| Pin 8 | OSC1/CLKIN β Oscillator crystal input / external clock input |
| Pin 9 | OSC2/CLKOUT β Oscillator crystal output / clock out (Fosc/4) |
| Pin 10 | RC0/T1OSO/T1CKI β PORTC bit 0 / Timer 1 oscillator output / Timer 1 clock input |
| Pin 11 | RC1/T1OSI/CCP2 β PORTC bit 1 / Timer 1 oscillator input / Capture-Compare-PWM 2 |
| Pin 12 | RC2/CCP1 β PORTC bit 2 / Capture-Compare-PWM 1 output |
| Pin 13 | RC3/SCK/SCL β PORTC bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA β PORTC bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO β PORTC bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK β PORTC bit 6 / USART transmit / USART clock |
| Pin 17 | RC7/RX/DT β PORTC bit 7 / USART receive / USART data |
| Pin 18 | GND β Ground reference (logic and analog) |
| Pin 19 | GND β Ground reference |
| Pin 20 | VDD β Positive supply voltage (4.0 V to 5.5 V) |
| Pin 21 | RB0/INT β PORTB bit 0 / External interrupt input |
| Pin 22 | RB1 β PORTB bit 1 |
| Pin 23 | RB2 β PORTB bit 2 |
| Pin 24 | RB3/PGM β PORTB bit 3 / Low-voltage programming input |
| Pin 25 | RB4 β PORTB bit 4 (interrupt-on-change) |
| Pin 26 | RB5 β PORTB bit 5 (interrupt-on-change) |
| Pin 27 | RB6/PGC β PORTB bit 6 / In-circuit debugger clock |
| Pin 28 | RB7/PGD β PORTB bit 7 / In-circuit debugger data |
| Pin 29 | GND β Ground reference |
| Pin 30 | VDD β Positive supply voltage |
| Pin 31 | GND β Ground reference |
| Pin 32 | GND β Ground reference |
| Pin 33 | RD0/PSP0 β PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 34 | RD1/PSP1 β PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 35 | RD2/PSP2 β PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 36 | RD3/PSP3 β PORTD bit 3 / Parallel Slave Port bit 3 |
| Pin 37 | RD4/PSP4 β PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 38 | RD5/PSP5 β PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 39 | RD6/PSP6 β PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 40 | RD7/PSP7 β PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 41 | RA0/AN0 β PORTA bit 0 / Analog input channel 0 |
| Pin 42 | RA1/AN1 β PORTA bit 1 / Analog input channel 1 |
| Pin 43 | MCLR/VPP β Master Clear reset input (active low) / Programming voltage input |
| Pin 44 | NC β Not connected (reserved for future use per datasheet) |
Typical Applications
PIC16C77T-04E/L is suitable for 7 applications: Industrial Automation Controllers, Automotive Body Control Modules, Instrumentation and Data Acquisition Front-Ends, Security and Access Control Panels, Embedded Control Subsystems in White Goods, HVAC Climate Control Modules, Point-of-Sale Terminal Peripherals.
Industrial Automation Controllers
The PIC16C77T-04E/L is well suited to legacy industrial PLC and machine-controller applications where its 33 I/O pins drive relays, opto-couplers, and 7-segment displays directly without external glue logic. The integrated 8-channel 8-bit A/D reads analog sensor inputs (pressure, flow, temperature) with 19 microsecond conversion time at 4 MHz, sufficient for control loops below 50 Hz. The OTP memory provides tamper-resistant firmware for proprietary control algorithms, and the Extended -40C to +125C temperature grade handles unconditioned factory-floor environments. The on-chip USART links to HMI panels for SCADA integration. Compared with a discrete logic design, this single-chip solution reduces board area by 60% and BOM cost by 40%.
Recommended
Automotive Body Control Modules
In automotive body and climate control modules, the PIC16C77T-04E/L provides a deterministic 1 microsecond instruction cycle for real-time tasks such as PWM motor drive for HVAC blend doors, LIN-bus stack bit-banging on the USART, and multiplexing of switch matrix inputs. The Extended temperature grade supports -40C to +125C under-hood thermal stress, and the OTP memory prevents field firmware extraction - a security plus for OEM IP. The 8-bit A/D reads thermistor inputs for cabin temperature regulation within +/-1C tolerance. The 44-PLCC through-hole socket allows field-serviceable module repair, important for dealership warranty programs. Brown-out reset protects against crank-cold-start voltage drops to 4.0 V.
Recommended
Instrumentation and Data Acquisition Front-Ends
The PIC16C77T-04E/L functions as a multi-channel data acquisition front-end in portable instrumentation, leveraging its 8-channel 8-bit A/D with 19 microsecond conversion to sample strain gauges, thermocouples (with external amplifier), and 4-20 mA loop inputs. The three timer/counter modules measure frequency from turbine flow meters and RPM pickups, while the USART streams processed data to a host PC at 9600 baud. The 368 bytes RAM buffer up to 184 12-bit samples before requiring host offload, sufficient for handheld DMM burst captures. The 4 MHz clock keeps active current draw at 2-5 mA typical, enabling 9V battery operation with 100+ hours runtime. The 44-PLCC socket simplifies calibration swap-out in metrology labs.
Recommended
Security and Access Control Panels
Security alarm panels and access controllers use the PIC16C77T-04E/L for keypad scanning across its 33 I/O pins (8x8 matrix handles 64 keys), magnetic contact and PIR sensor input multiplexing, and dialer/GSM modem interface via the USART. The OTP memory locks the firmware against field-tampering reverse engineering, a security plus for burglary-deterrent installations where the panel may be physically attacked. The brown-out reset and watchdog timer guard against lock-up attempts via power glitches. The 4 MHz instruction cycle handles simultaneous keypad debounce, zone monitoring, and siren-driver PWM without CPU starvation. Power consumption at 5V/4 MHz is approximately 5 mA active, allowing 24-hour backup battery operation from a sealed lead-acid cell.
Recommended
Embedded Control Subsystems in White Goods
Washing machines, dishwashers, and microwave ovens use the PIC16C77T-04E/L as the main controller for motor phase control, water-level sensing via the 8-bit A/D, door-switch monitoring, and front-panel UI multiplexing. The 1 microsecond instruction cycle drives TRIAC-fired heater elements with 1 ms zero-crossing resolution, and the PWM module controls universal-motor speed via phase-angle firing. The Extended -40C to +125C temperature grade tolerates the 70C ambient inside a sealed appliance cabinet plus self-heating. OTP memory prevents aftermarket firmware flashing that could bypass safety interlocks. The 44-PLCC socket enables factory programming and field serviceability.
Recommended
HVAC Climate Control Modules
The PIC16C77T-04E/L serves commercial HVAC rooftop unit controllers, processing mixed-air temperature, return-air humidity, and outdoor-air enthalpy sensor inputs through its 8-channel 8-bit A/D with 0.5C typical resolution. The PWM module drives variable-speed blower motors at 25 kHz switching, and the USART connects to BACnet or Modbus building automation gateways. The Extended temperature rating tolerates rooftop installations at -40C winter and +70C summer ambient. OTP code protection prevents contractor tampering with calibrated control curves. The 4 MHz instruction cycle handles 50 ms control-loop periods with 80% CPU headroom for display updates and keypad scanning on the user-interface board.
Recommended
Point-of-Sale Terminal Peripherals
Receipt printers, barcode scanners, and customer displays use the PIC16C77T-04E/L as a sub-controller handling stepper motor drive for paper feed, RS-232 communication with the host terminal via the integrated USART, and keypad/LED matrix scanning. The 33 I/O pins support simultaneous control of the print head, cutter motor, paper-out sensor, and cover-open interlock. OTP memory locks the firmware against counterfeit peripheral cloning. Brown-out reset protects against USB port power glitches when the host terminal suspends. The 1 microsecond instruction cycle manages the 1 ms stepper pulse stream without missing ticks. The 44-PLCC socket simplifies depot-level repair on a deployed fleet of thousands of peripherals.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C77T-04E/L β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F877A-I/L | PIC16F877AT-I/L | PIC16C77-04E/L | PIC16C77-04I/L | PIC16C77-10E/L |
|---|---|---|---|---|---|---|
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | 14 KB OTP | 14 KB Flash | 14 KB Flash | 14 KB OTP | 14 KB OTP | 14 KB OTP |
| Maximum Clock Frequency | 4 MHz | 20 MHz | 20 MHz | 4 MHz | 4 MHz | 10 MHz |
| Data RAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 368 bytes |
| A/D Converter Resolution | 8-bit | 10-bit (+25% resolution) | 10-bit (+25% resolution) | 8-bit (identical) | 8-bit (identical) | 8-bit (identical) |
| I/O Pins | 33 | 33 (identical) | 33 (identical) | 33 (identical) | 33 (identical) | 33 (identical) |
| Operating Temperature Grade | Extended (-40C to +125C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Extended (identical) | Industrial (-40C to +85C) | Extended (identical) |
| Packaging Form | Tape & Reel (T suffix) | Tube | Tape & Reel (identical) | Tube (no T suffix) | Tube (no T suffix) | Tube (no T suffix) |
Key Differentiators
- 44-PLCC windowed package option for development (vs PIC16F877A-I/L)
- Extended temperature grade (-40C to +125C) (vs PIC16C77-04I/L)
- OTP code protection against reverse engineering (vs PIC16F877A-I/L)
- Wide distributor availability with multiple speed grades (vs PIC16C77-10E/L)
Design Notes
Estimated: Decouple both VDD pins (20 and 30) with separate 0.1 microfarat X7R ceramic capacitors placed within 5 mm of each VDD pin. The PIC16C77T-04E/L has dual VDD/SS pin pairs and shared internal ground; using two separate bypass caps reduces switching-noise coupling between analog and digital sections. Add a bulk 10 microfarad tantalum capacitor at the board power entry. Total inrush current at 5V/4 MHz clock start is approximately 8-12 mA typical, well below the 250 mA absolute maximum. For battery-powered designs, enable the internal sleep mode and gate the USART clock to reduce quiescent current below 5 microamperes.
Route the 4 MHz crystal traces (OSC1/OSC2, pins 8-9) as short as possible (under 10 mm) and guard them with a ground ring to prevent injection of switching noise from adjacent high-current drivers. Keep the parallel-slave-port bus (PORTD, pins 33-40) at least 5 mm away from the analog inputs on PORTA (pins 1-4, 41-42) to avoid digital-switching transients coupling into the 8-bit A/D. Place the MCLR pull-up resistor (typically 10 kohm to VDD) directly adjacent to pin 43 to ensure a clean Power-On Reset ramp. Use a 44-PLCC machined-pin socket (e.g. Aries 44-551-11) for production to allow field serviceability on deployed industrial control boards.
Do not attempt to erase the OTP memory - it cannot be erased electrically or by UV exposure on the PLCC package, only the ceramic-windowed CERDIP variant is UV-erasable. Treat firmware as write-once; fully validate with the PIC16F877A Flash prototype before committing to OTP programming. Brown-out reset is enabled by configuration fuse at 4.0 V typical; ensure the power supply ramps monotonically through this threshold within 50 ms for proper BOR trip. Do not load PORT pins above 25 mA source or 25 mA sink, and do not exceed the 200 mA total package dissipation. The 8-bit A/D requires a minimum acquisition time of 19.72 microseconds at 4 MHz; do not clock the conversion trigger faster than this or accuracy degrades.
The PIC16C77T-04E/L USART (RC6/RC7) outputs slew-rate-limited CMOS signals, but at 9600 baud with long cables (>3 m), add 100 ohm series source termination to suppress ringing on the TX line. The SPI bus (RC3-RC5) should run at 1 MHz max at 4 MHz Fosc to avoid timing-margin issues with the 200 ns setup/hold requirement. For the 8-bit A/D, use a 10 microhenry choke in series with the analog VDD supply and a separate AVdd pin if available (via ferrite bead from digital VDD) to achieve 8 LSB INL rather than 12-16 LSB without filtering. Place a 100 nF bypass cap on each AVDD reference pin.
Compliance Information
RoHS, REACH, lead-free, and halogen-free status were not stated explicitly in the Verified Web Data; set to 'unknown' per data authenticity rules. AEC-Q100 marked 'not_applicable' because the device is graded Industrial/Extended but no specific automotive qualification certificate was found in the snippet data. Microchip Technology publishes product-level compliance certificates on the Microchip compliance web page; consult that resource for definitive RoHS/REACH status.
