PIC16C77-20I/L - 8-Bit 20MHz OTP MCU 14KB | Microchip
MPN: PIC16C77-20I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.18 | $7.18 |
| 10 | $6.55 | $65.50 |
| 100 | $5.61 | $561.00 |
| 500 | $4.92 | $2,460.00 |
| 1,000 | $4.1 | $4,100.00 |
PIC16C77-20I/L Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data memory, and peripherals on one die, optimized for embedded control rather than computational throughput. Within the broader semiconductor taxonomy, the PIC16C77 belongs to the family of 8-bit microcontrollers -> microcontrollers -> microcontrollers (MCUs) -> embedded processors -> semiconductors. The OTP variant is intended for production designs where firmware is finalized and no field re-programmability is needed; a UV-erasable windowed sibling (CERDIP) is used during prototype bring-up.
Key differentiating specifications include 5 MIPS peak throughput at 20 MHz, 35 single-word instructions with all instructions executing in a single cycle except program branches (two cycles), high sink/source current of 25 mA/25 mA per pin suitable for direct LED driving, and ultra-low standby current of 1 uA typical at 3V/32 kHz for battery-backed applications. The wide 2.5 V to 6.0 V operating range covers both 3.3 V and 5 V systems from a single part.
Architecturally, the PIC16C77 uses a Harvard-class RISC core with separate program and data buses, enabling simultaneous instruction fetch and operand access. The CMOS process yields typical active current of 2 mA at 5 V/4 MHz and 15 uA at 3 V/32 kHz, giving designers headroom for power-budgeting in always-on industrial nodes. Brown-out reset and a programmable watchdog timer are integrated for unattended field operation.
Typical applications include industrial automation controllers, sensor signal conditioning front-ends, motor drive command processors, HVAC damper/valve actuators, automotive body and chassis subsystems, and white-goods user-interface boards. The 8-channel ADC is well-matched to multi-sensor scanning, while the dual PWM channels support brushed DC and stepper commutation.
When designing with this device, budget for OTP programming time during manufacturing (one-shot, no field updates) and ensure the PLCC-44 socket accommodates a programming adapter. The device's 25 mA sink/source eliminates many discrete driver transistors, simplifying PCB layout and BOM cost.
This page synthesizes DigiKey/Mouser/Octopart pricing, Microchip cross-reference guidance, and parametric drop-in alternatives not found in any single distributor listing, giving engineers a single-source decision view.
Drop-in alternatives for PIC16C77-20I/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 PIC16C77-20I/L (same form factor and footprint) — differing in Timers, Program Memory Type, Package, Program Memory Size, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16C77-10I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C77-04I/L
✅ Drop-In✓ In Stock
$6.1 / Unit
View Datasheet →PIC16C77-04/L
✅ Drop-In✓ In Stock
$5.98 / Unit
View Datasheet →PIC16C77-10/PT
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.7 / Unit
View Datasheet →PIC16C77-20I/L Maximum Ratings & Electrical Characteristics
| Architecture | 8-bit Harvard RISC |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 14 KB (8K x 14) |
| RAM Size | 368 bytes |
| EEPROM Data Memory | None (external only) |
| Maximum Clock Frequency | 20 MHz |
| Instruction Throughput | 5 MIPS (200 ns per instruction) |
| Instruction Set | 35 single-word instructions |
| I/O Pins | 33 |
| ADC | 8 channels x 8-bit |
| Timers | 2 x 8-bit + 1 x 16-bit |
| Capture/Compare/PWM | 2 modules |
| Serial Interfaces | SSP (SPI / I2C) + USART |
| Operating Voltage | 2.5 V to 6.0 V (4.0 V to 5.5 V for 20 MHz) |
| I/O Sink/Source Current | 25 mA / 25 mA |
| Standby Current | 1 uA typical at 3 V / 32 kHz |
| Active Current | 15 uA typical at 3 V / 32 kHz; 2 mA typical at 5 V / 4 MHz |
| Operating Temperature | -40 C to +85 C (Industrial, "I") |
| Package | 44-pin PLCC (16.59 x 16.59 mm) |
| Mounting Type | Surface Mount |
| MSL Level | 3 (168 hours) |
| Lead-Free / RoHS | Lead-free terminal finish, RoHS compliant status varies by date code |
PIC16C77-20I/L Pin Configuration
| Pin 1 | RA2/AN2 — PORTA bit 2 / ADC analog input 2 |
| Pin 2 | RA3/AN3 — PORTA bit 3 / ADC analog input 3 |
| Pin 3 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 4 | RA5/AN4/SS — PORTA bit 5 / ADC input 4 / SPI slave select |
| Pin 5 | RA6/OSC2 — PORTA bit 6 / crystal oscillator output |
| Pin 6 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Pin 7 | RA0/AN0 — PORTA bit 0 / ADC analog input 0 |
| Pin 8 | RA1/AN1 — PORTA bit 1 / ADC analog input 1 |
| Pin 9 | MCLR/VPP — Master clear reset / programming voltage input |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage |
| Pin 12 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 13 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 14 | RB5 — PORTB bit 5 |
| Pin 15 | RB4 — PORTB bit 4 |
| Pin 16 | RB3/CCP2 — PORTB bit 3 / Capture-Compare-PWM 2 |
| Pin 17 | RB2 — PORTB bit 2 |
| Pin 18 | RB1 — PORTB bit 1 |
| Pin 19 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply voltage |
| Pin 22 | RC7/RX/DT — PORTC bit 7 / USART RX / synchronous data |
| Pin 23 | RC6/TX/CK — PORTC bit 6 / USART TX / synchronous clock |
| Pin 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 25 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 26 | RC3/SCL/SCK — PORTC bit 3 / I2C clock / SPI clock |
| Pin 27 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM 1 |
| Pin 28 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Pin 29 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock |
| Pin 30 | RD7 — PORTD bit 7 |
| Pin 31 | RD6 — PORTD bit 6 |
| Pin 32 | RD5 — PORTD bit 5 |
| Pin 33 | RD4 — PORTD bit 4 |
| Pin 34 | RD3 — PORTD bit 3 |
| Pin 35 | RD2 — PORTD bit 2 |
| Pin 36 | RD1 — PORTD bit 1 |
| Pin 37 | RD0 — PORTD bit 0 |
| Pin 38 | VSS — Ground reference |
| Pin 39 | VDD — Positive supply voltage |
| Pin 40 | RE0/AN5 — PORTE bit 0 / ADC input 5 |
| Pin 41 | RE1/AN6 — PORTE bit 1 / ADC input 6 |
| Pin 42 | RE2/AN7 — PORTE bit 2 / ADC input 7 |
| Pin 43 | VSS — Ground reference |
| Pin 44 | VDD — Positive supply voltage |
Typical Applications
PIC16C77-20I/L is suitable for 6 applications: Industrial Process Sensor Scanner, HVAC Damper and Valve Actuator Control, Automotive Body and Chassis Subsystems, White Goods User Interface Board, Battery-Backed Remote Sensor Node, Brushed DC Motor Speed Controller.
Industrial Process Sensor Scanner
The PIC16C77-20I/L fits industrial multi-sensor scanning because it integrates 8 channels of 8-bit ADC in one chip, allowing direct interface to thermistor, pressure, flow, and level transducers without an external analog mux. Its 33 digital I/O lines drive indicator LEDs, keypads, and relay coils at 25 mA per pin, eliminating discrete drivers. The 5 MIPS throughput at 20 MHz easily handles linearization, averaging, and Modbus-over-RS-485 framing in real time, and the 1 uA standby current preserves battery backup on panel-mounted controllers.
Recommended
HVAC Damper and Valve Actuator Control
The PIC16C77-20I/L is well matched to HVAC actuator control thanks to its dual capture/compare/PWM channels, which directly drive TRIAC gate optos for AC damper/valve modulation while a third timer schedules the PID loop. The 8-channel ADC scans mixed-temperature and pressure sensors, and the USART links to a wall thermostat or building automation bus. Industrial -40 to +85 C operation tolerates rooftop and plant-room environments, and the 25 mA I/O eliminates relay-driver transistors in compact PCB layouts.
Recommended
Automotive Body and Chassis Subsystems
For non-safety automotive body electronics such as seat controllers, mirror adjusters, or auxiliary lighting modules, the PIC16C77-20I/L provides 33 I/O with 25 mA drive, dual PWM for motor speed, and SPI/I2C for sensor and lighting-network peripherals. The -40 to +85 C Industrial grade tolerates under-dash thermal environments. However, AEC-Q100 safety-critical modules should migrate to a Q100-qualified Flash MCU; this part is appropriate only for body-comfort subsystems without functional-safety mandates.
Recommended
White Goods User Interface Board
Washing machines, dishwashers, and microwave ovens benefit from the PIC16C77-20I/L's mix of 8-bit ADC for water-level/temperature sensing, dual PWM for motor and buzzer control, and 25 mA I/O to scan 7-segment LED displays without driver ICs. The USART interfaces to inverter boards, while SSP runs an I2C EEPROM for cycle-memory storage. Its 2.5-6.0 V supply range covers both 3.3 V and 5 V designs, simplifying BOM reuse across product variants in a white-goods family.
Recommended
Battery-Backed Remote Sensor Node
The PIC16C77-20I/L is suited to duty-cycled remote sensor nodes because its 1 uA typical standby at 3 V/32 kHz lets a primary cell last years between service intervals. The internal ADC samples slow-moving environmental variables (temperature, humidity, soil moisture), and the USART bursts data through a 433 MHz or LoRa module on a periodic wake schedule. Brown-out reset protects against low-cell conditions, and the Industrial temperature grade tolerates outdoor enclosures in cold-climate deployments.
Recommended
Brushed DC Motor Speed Controller
Speed control of small brushed DC motors (fans, pumps, conveyor rollers) maps directly onto the PIC16C77-20I/L's two capture/compare/PWM modules, which generate complementary PWM signals up to 20 kHz for MOSFET H-bridge gate drivers. The 8-channel ADC monitors back-EMF or current shunt feedback for closed-loop regulation. The 25 mA I/O drives opto-isolated fault inputs without buffering, and the USART exposes a tuning/debug port for factory calibration of motor parameters.
Recommended
Recommended Products Summary
Engineering reference data for PIC16C77-20I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16C77-10I/L | PIC16C77-04I/L | PIC16C77-04/L |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (16.59 x 16.59 mm) | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same |
| Max Clock Frequency | 20 MHz | 10 MHz | 4 MHz | 4 MHz |
| Temperature Grade | Industrial (-40 to +85 C) | Industrial (-40 to +85 C) | Industrial (-40 to +85 C) | Commercial (0 to +70 C) |
| Program Memory Type | OTP (14 KB) | OTP (14 KB) | OTP (14 KB) | OTP (14 KB) |
| I/O Pins | 33 | 33 | 33 | 33 |
| ADC Channels | 8 x 8-bit | 8 x 8-bit | 8 x 8-bit | 8 x 8-bit |
| Operating Voltage | 4.0-5.5 V at 20 MHz | 2.5-6.0 V at 10 MHz | 2.5-6.0 V at 4 MHz | 2.5-6.0 V at 4 MHz |
Key Differentiators
- Highest-speed grade in the PIC16C77 OTP family (vs PIC16C77-10I/L)
- Industrial temperature grade in a 20 MHz OTP MCU (vs PIC16C77-20/L)
- 33 high-current I/O pins eliminate driver ICs (vs PIC16C77-04I/L)
Design Notes
Place the 44-pin PLCC socket footprint on 1.27 mm (50 mil) pitch per IPC-7351 nominal PLCC-44 land pattern. Tie MCLR (pin 9) high through a 10 kohm pull-up to VDD, with a 100 nF cap to ground for noise immunity on industrial boards. Add a 10 uF bulk + 100 nF decoupling pair close to each VDD/VSS pin pair (pins 11/10, 21/20, 39/38, 44/43) - the PLCC has four VDD/VSS pairs to minimize switching-current loop area.
Estimated: At 5 V VDD, 20 MHz oscillator, the PIC16C77-20I/L draws approximately 15 mA active current; on a 2-layer FR-4 board with theta_JA around 80 C/W the junction-to-ambient rise is 1.2 C per mA. For battery-backed designs, leverage the 1 uA typical standby at 3 V/32 kHz by switching to the secondary LF oscillator via the OSCCON register before sleep and gating unused peripherals in PCFG and TRIS.
OTP memory cannot be re-programmed in the field, so the only firmware recovery after lockup is external programmer access via ICSP pins RB6/PGC (pin 13) and RB7/PGD (pin 12). Always design the ICSP header to be accessible even in production enclosures, or factory-reset becomes a recall event. Brown-out and watchdog must be enabled in the CONFIG word, or unexpected reset behavior will appear in field deployments.
Compliance Information
RoHS compliant per Microchip product page; lead-free terminal finish. Industrial temperature grade (-40 to +85 C) but NOT AEC-Q100 qualified - not for safety-critical automotive. Halogen-free status not stated in the verified web data.
