PIC16LC77T-04/L - 4MHz 8-bit OTP MCU 14KB Flash 44-PLCC | Microchip
MPN: PIC16LC77T-04/L ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.5 | $8.50 |
| 10 | $7.65 | $76.50 |
| 100 | $6.8 | $680.00 |
| 500 | $6.1 | $3,050.00 |
| 1,000 | $5.45 | $5,450.00 |
PIC16LC77T-04/L Overview
An 8-bit PIC microcontroller (MCU) is a small, low-power computer-on-a-chip built around a Harvard-architecture RISC CPU with separate program and data buses, a fixed instruction set, and integrated peripherals such as timers, A/D converters, and serial interfaces. Within the broader taxonomy, this device sits at: PIC16C7X -> PIC16 family -> PIC microcontroller -> 8-bit MCU -> microcontroller -> embedded processor -> semiconductor. PIC mid-range MCUs are widely used for deterministic, low-cost control applications because the 14-bit instruction word keeps code density high while the RISC pipeline delivers predictable interrupt latency.
Key differentiating specifications of the PIC16LC77T-04/L include 14 KB OTP program memory organized as 8K x 14 bits, 368 bytes of data RAM, 33 I/O pins with high-current sink/source capability, an integrated 8-bit A/D converter with up to 8 input channels, two 8-bit timers plus one 16-bit timer, a USART for asynchronous/synchronous serial communication, and a master/slave SSP. The 44-pin PLCC package provides a socket-replaceable, surface-mount form factor useful for prototyping and field serviceability.
Architecturally, the device uses a RISC core with 35 single-cycle instructions, a 14-bit instruction word, and a 4 MHz internal clock that yields a 250 ns instruction cycle. The Brown-out Reset (BOR), Power-on Reset (POR), and Watchdog Timer (WDT) with on-chip RC oscillator provide reliable operation in electrically noisy industrial environments, while the wide operating voltage range (typically 2.5 V to 6.0 V for the LC variant) supports both 3.3 V and 5 V system rails.
Typical applications include industrial process control, motor control front-ends, instrumentation data acquisition, security system panels, automotive body electronics (non-safety), HVAC controllers, and general-purpose embedded control. The combination of OTP memory, integrated ADC, and USART also suits remote sensor hubs and simple human-machine interface (HMI) controllers.
When designing with this part, note that OTP memory cannot be electrically erased - prototypes should use the windowed (UV-erasable) PIC16LC77-04/L variant during development, and production code must be fully verified before programming. Decoupling should include a 0.1 µF ceramic capacitor placed within 5 mm of the VDD pin, with a 10 µF bulk capacitor at the regulator output.
This page synthesizes distributor availability, drop-in same-package alternatives, AEO-optimized FAQ answers, and practical design notes that complement the manufacturer datasheet and help engineers quickly assess fit, sourcing risk, and PCB-level integration.
Drop-in alternatives for PIC16LC77T-04/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 PIC16LC77T-04/L (same form factor and footprint) — differing in Core Architecture, Package, Program Memory Size, Timers, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC77-04/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16C77-04/L
✅ Drop-In✓ In Stock
$5.98 / Unit
View Datasheet →PIC16LC74A-04/PQ
✅ Drop-In✓ In Stock
$2.43 / Unit
View Datasheet →PIC16LC74BT-04I/PQ
✅ Drop-In✓ In Stock
$10.5 / Unit
View Datasheet →PIC16F877A-I/LG
✅ Drop-In✓ In Stock
$4.78 / Unit
View Datasheet →PIC16LC77T-04/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16C mid-range 8-bit RISC |
| Instruction Set Word Width | 14-bit |
| Maximum CPU Clock | 4 MHz |
| Instruction Cycle Time | 250 ns (at 4 MHz) |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 14 KB (8K x 14 instructions) |
| Data RAM | 368 bytes |
| I/O Pins | 33 |
| Operating Voltage Range | 3.0 V to 6.0 V (LC variant; 5 V nominal) |
| A/D Converter | 8-bit, up to 8 channels |
| Timers | Two 8-bit + one 16-bit |
| Serial Interfaces | USART + Synchronous Serial Port (SSP) |
| Package | 44-pin PLCC (J-Lead, 16.59 x 16.59 mm) |
| Mounting Type | Surface Mount (PLCC socket compatible) |
| Operating Temperature | 0 C to +70 C (commercial) |
| Lead-Free / RoHS | Depends on date code - verify before use |
| Special Features | Brown-out Reset, Power-on Reset, Watchdog Timer, ICD support |
PIC16LC77T-04/L 44-pin plcc (j-lead, 16.59 x 16.59 mm) Pin Configuration Guide
Pin configuration for PIC16LC77T-04/L (44-pin plcc (j-lead, 16.59 x 16.59 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for PIC16LC77T-04/L.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC16LC77T-04/L is suitable for 6 applications: Industrial Process Control, HVAC Control Systems, Security and Alarm Panels, Motor Control Front-End, Data Acquisition Modules, Human-Machine Interface (HMI) Controllers.
Industrial Process Control
The PIC16LC77T-04/L fits industrial process controllers because its 8-bit ADC, 33 I/O pins, and 14 KB OTP memory support multi-channel sensor acquisition and deterministic actuator control on 3.3 V or 5 V rails. The 250 ns instruction cycle allows sub-millisecond response loops at the 4 MHz clock, while the 368-byte RAM accommodates small PID state structures. Compared with the modern PIC16F877A, this OTP variant is preferred where firmware stability and field-proven code are mandatory.
Recommended
HVAC Control Systems
For HVAC controllers, the PIC16LC77T-04/L provides the integrated ADC needed for thermistor and pressure transducer inputs, plus PWM-capable CCP modules for driving fan motors and damper actuators. The 33 I/O pins support keypad input, multi-digit seven-segment display output, and relay switching interfaces. The 3.0 V to 6.0 V operating voltage range simplifies 5 V relay supply design and broadens compatibility with 24 VAC-derived DC rails after rectification and regulation.
Recommended
Security and Alarm Panels
In security panels, the PIC16LC77T-04/L manages multiple zone loops via its ADC and digital inputs, drives piezo buzzers and LED indicators through PWM and standard I/O, and communicates with central stations through the integrated USART. The brown-out reset and watchdog timer provide the supervisory reliability required by UL-listed alarm installations, and the OTP memory prevents firmware tampering in field-deployed units. The 368-byte RAM easily handles zone-state tables and event logs.
Recommended
Motor Control Front-End
For low-power motor drives such as small BLDC or stepper control boards, the PIC16LC77T-04/L provides the 16-bit timer and CCP modules needed for closed-loop commutation and PWM generation at up to 4 MHz instruction throughput. Its 33 I/O pins drive half-bridge gate drivers and read Hall-effect sensor feedback, while the USART enables command and telemetry to a host controller. This OTP MCU is well suited for cost-sensitive appliance motion control where firmware is locked at production.
Recommended
Data Acquisition Modules
For small-channel data loggers and remote sensor hubs, the PIC16LC77T-04/L uses its 8-channel 8-bit ADC and integrated USART to digitize analog inputs and forward readings to a host or GSM modem. The 368-byte RAM acts as a sample buffer between acquisition and asynchronous transmission, while the 14 KB OTP holds the acquisition schedule and serial protocol stack. Low-voltage LC operation (down to 3.0 V) enables battery-powered deployments with a 3.3 V regulator.
Recommended
Human-Machine Interface (HMI) Controllers
The PIC16LC77T-04/L is well suited to small HMI controllers driving character LCDs, keypad matrices, and status LEDs in industrial equipment. Its 33 I/O pins directly interface a 4x4 keypad, a 16x2 character LCD, and LED arrays without external I/O expanders. The CCP modules generate tones for piezo feedback, and the 14 KB OTP memory stores the menu state machine and keymap tables. For new designs, the modern PIC16F877A-I/L with flash and ICD debugging is preferred, but this OTP part remains ideal for production-locked HMIs.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC77T-04/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC77-04/L | PIC16C77-04/L | PIC16F877A-I/L |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same |
| Program Memory | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB Flash |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| Operating Voltage | 3.0 V to 6.0 V (LC) | 3.0 V to 6.0 V (LC) | 4.5 V to 6.0 V | 2.0 V to 5.5 V (LF) |
| Data RAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes |
| ADC Resolution | 8-bit | 8-bit | 8-bit | 10-bit |
| Memory Type | OTP | OTP | OTP | Flash |
| Lifecycle Status | NRND | NRND | NRND | Active |
Key Differentiators
- Tape & Reel packaging for high-volume SMT assembly (vs PIC16LC77-04/L)
- Low-voltage LC variant supporting 3.3 V operation (vs PIC16C77-04/L)
- OTP program memory for production-locked firmware (vs PIC16F877A-I/L)
Design Notes
Estimated: the PIC16LC77T-04/L draws up to 25 mA at 4 MHz/5 V with all 33 I/O pins driving loads; place a 0.1 µF ceramic decoupling capacitor within 5 mm of VDD and a 10 µF bulk capacitor at the regulator output to suppress switching transients during I/O toggling. The brown-out reset threshold is approximately 4.0 V, so for 3.3 V-only operation verify the BOR is disabled in configuration bits. For battery-powered designs, run the LC variant at 3.3 V and put the MCU in SLEEP mode between ADC samples to reduce current to single-digit microamps.
The 44-pin PLCC J-lead package requires a JEDEC-standard 44-pin PLCC socket for socketed designs or reflow soldering for SMT integration. Route the 4 MHz crystal traces (OSC1/OSC2) within 5 mm of the MCU, guard them with a grounded trace, and keep them short to minimize stray capacitance. The MCLR reset pin should have a 10 kΩ pull-up to VDD and a 100 nF capacitor to ground; avoid long MCLR traces which couple noise into the internal reset generator. PORTA pins used as analog inputs should be isolated from digital switching lines by a ground guard ring to reduce ADC channel crosstalk.
OTP memory cannot be electrically erased, so design verification must be done on the windowed PIC16LC77-04/L UV-erasable variant or in-circuit via ICD on a PIC16F877A-I/L adapter board before committing code to OTP. Do not exceed 4 MHz oscillator frequency on the -04 speed grade; higher crystals violate timing margins and may produce unreliable ADC readings. The configuration bits (especially oscillator selection, watchdog enable, and brown-out reset threshold) must be set explicitly - leaving them at default erase state can leave the watchdog active and hang the application without an external reset.
When driving long cables or relays from the I/O pins, add series resistors (100 Ω to 1 kΩ) to limit surge currents and reduce EMI ringing. The USART pins RC6/RC7 share functionality with the PORTC general I/O, so disable the USART in the RCSTA register if not in use to free the pins for GPIO. The ADC acquisition time must be at least 19.5 µs at 4 MHz; verify the A/D clock divider (ADCON0) is configured to meet the minimum TAD spec given in the electrical characteristics table.
Compliance Information
RoHS/REACH compliance depends on date code and specific manufacturing lot. Older production runs may use SnPb lead finish while newer lots are Pb-free - verify with the certificate of compliance (CoC) for the specific date code. Not AEC-Q100 qualified; not recommended for new automotive designs.
