PIC16LC65A-04/PT - 8-Bit MCU, 7KB OTP, 4MHz, TQFP-44 | Microchip
MPN: PIC16LC65A-04/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.88 | $5.88 |
| 10 | $5.46 | $54.60 |
| 100 | $4.92 | $492.00 |
| 500 | $4.4 | $2,200.00 |
| 1,000 | $3.95 | $3,950.00 |
PIC16LC65A-04/PT Overview
What is a PIC microcontroller? A PIC (Peripheral Interface Controller) is a family of Harvard-architecture 8-bit RISC microcontrollers originally developed by General Instrument's Microelectronics Division and popularized by Microchip Technology. PIC microcontrollers occupy the product hierarchy: microcontroller -> embedded processor -> semiconductor IC. They integrate a CPU core, program memory (ROM/Flash/OTP), data memory (RAM), peripherals (timers, ADC, USART, I/O ports), and a clock generator in a single chip, providing a complete compute platform for embedded control applications.
Key features of the PIC16LC65A-04/PT include a 14-bit instruction word with 35 single-word instructions, 8-level deep hardware stack, two 8-bit timers and one 16-bit timer, a 5-channel 8-bit ADC, USART serial port, and watchdog timer with on-chip RC oscillator. The device supports in-circuit serial programming (ICSP) and offers brown-out reset (BOR) circuitry for reliable operation in noisy industrial environments. The 33 I/O pins are organized into five ports (RA, RB, RC, RD, RE) capable of sinking or sourcing up to 25 mA per pin for direct LED or relay drive.
Architecturally, the PIC16LC65A employs a modified Harvard architecture with separate program and data buses, enabling instruction fetch and operand read in a single cycle. The 4 MHz oscillator allows a 1 MHz instruction rate (4:1 clock-to-instruction ratio, or 250 ns per instruction). The OTP program memory is programmed once and is non-erasable, making this part economical for medium-volume production where code stability is required but firmware updates are not anticipated.
Typical applications include industrial control panels, home appliance controllers, automotive body electronics, HVAC thermostat units, security system keypads, and battery-powered sensor interfaces. The wide 2.5V-5.5V operating range allows direct connection to single-cell Li-ion or two-AA battery stacks.
When designing with the PIC16LC65A-04/PT, note that OTP memory cannot be re-programmed; consider PIC16F74-I/PT (Flash-based, 40-pin PDIP) or PIC16F77-I/PT (Flash, 44-pin TQFP) for development or production runs requiring firmware updates. Use MPLAB X IDE with MPASM or XC8 compiler for code development and ICSP for device programming.
This page synthesizes distributor pricing, drop-in TQFP-44 alternatives, and practical design notes not consolidated in the manufacturer datasheet.
Drop-in alternatives for PIC16LC65A-04/PT — 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 PIC16LC65A-04/PT (same form factor and footprint) — differing in Core Architecture, Operating Temperature Range, Package, Program Memory Size, RAM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F77-I/PT
✅ Drop-In✓ In Stock
$5.4 / Unit
View Datasheet →PIC16LC65B-04I/PT
✅ Drop-In✓ In Stock
$4.3 / Unit
View Datasheet →PIC16LC65A-04I/PT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC16C65A-04E/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$10.4 / Unit
View Datasheet →PIC16LF1947-I/PT
✅ Drop-In✓ In Stock
$2.55 / Unit
View Datasheet →PIC16LC65A-04/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory | 7 KB OTP (4K x 14 words) |
| Data Memory (RAM) | 192 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 250 ns at 4 MHz |
| Operating Voltage Range | 2.5 V to 5.5 V |
| I/O Pins | 33 |
| Timers | 2 x 8-bit Timer0/Timer2, 1 x 16-bit Timer1 |
| ADC | 5-channel, 8-bit resolution |
| Serial Communication | USART/SCI |
| Watchdog Timer | Yes, with on-chip RC oscillator |
| Brown-out Reset (BOR) | Yes |
| In-Circuit Serial Programming (ICSP) | Yes |
| Package | 44-pin TQFP (PT) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | 0C to +70C (commercial) |
| Instruction Set | 35 single-word instructions, 14-bit wide |
| Stack Depth | 8 levels hardware |
PIC16LC65A-04/PT 44-pin tqfp (pt) Pin Configuration Guide
Pin configuration for PIC16LC65A-04/PT (44-pin tqfp (pt) 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 PIC16LC65A-04/PT.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC16LC65A-04/PT is suitable for 6 applications: Industrial Control Panel, Home Appliance Controller, HVAC Thermostat Unit, Security System Keypad, Battery-Powered Sensor Interface, Automotive Body Electronics.
Industrial Control Panel
The PIC16LC65A-04/PT fits industrial control panels where 33 I/O pins drive LED indicators, keypads, and relay outputs for machinery control. Its 7KB OTP memory stores control logic for conveyor sequencing, motor start/stop routines, and safety interlocks. The 5-channel 8-bit ADC reads analog sensors (temperature, pressure, flow) at 4 MHz with sufficient throughput for 100 Hz sampling. The 2.5V-5.5V operating range accepts 24V industrial rails stepped down via linear regulators. Its USART interfaces to Modbus RTU slave devices for SCADA integration. The 44-pin TQFP package provides compact PCB placement behind panel displays, while brown-out reset protects against industrial voltage transients that would otherwise corrupt OTP-stored state machines during brown-out events.
Recommended
Home Appliance Controller
The PIC16LC65A-04/PT serves as the main controller in home appliances such as washing machines, microwave ovens, and dishwasher control boards. Its 33 I/O pins drive seven-segment displays, button matrices, and triac-trigger outputs for heater and motor load switching. The 7KB OTP memory stores appliance firmware (wash cycles, cooking profiles, sensor calibration tables) that does not require field updates. The 192-byte RAM supports real-time variables for timer state, sensor readings, and user input debouncing. The two 8-bit timers generate PWM for variable-speed motor control, while the 16-bit Timer1 drives the system tick at 1 ms resolution. The USART enables diagnostics via factory test ports. Watchdog timer with on-chip RC oscillator recovers from firmware lockup caused by EMI events in residential environments.
Recommended
HVAC Thermostat Unit
The PIC16LC65A-04/PT operates effectively in HVAC thermostat designs requiring reliable temperature regulation and user interface management. Its 4 MHz clock and 250 ns instruction cycle provide sufficient processing headroom for PID control loops running at 1 Hz update rates. The 5-channel ADC reads thermistor inputs, humidity sensors, and setpoint potentiometers. Three timer channels generate PWM outputs for damper motor control and furnace staging relays. The wide 2.5V-5.5V supply range supports direct connection to 24VAC HVAC transformer outputs after rectification. The USART allows connection to Wi-Fi or Zigbee modules for smart thermostat networking. Brown-out reset prevents false thermostat calls during HVAC compressor inrush events. The TQFP-44 package supports compact PCB layouts behind wall-mount thermostat faceplates.
Recommended
Security System Keypad
The PIC16LC65A-04/PT is well-suited for security alarm keypads and access control panels where reliability and tamper resistance are critical. The 33 I/O pins scan 4x4 key matrices, drive piezo buzzers, and control LED zone status indicators without external logic. OTP memory prevents unauthorized firmware modification - a security advantage in alarm panel designs. The USART interfaces to RF receiver modules for wireless sensor zones. Brown-out reset with programmable threshold ensures alarm state retention during power glitches. The watchdog timer recovers from code execution anomalies caused by intentional EMI injection attacks. The TQFP-44 package supports slim wall-mount keypad enclosures. The 7KB program memory accommodates zone configuration tables, user code storage, and event logging for UL-listed security installations.
Recommended
Battery-Powered Sensor Interface
The PIC16LC65A-04/PT enables battery-powered sensor interfaces in remote monitoring stations, environmental loggers, and wireless telemetry nodes. Its low-voltage CMOS process (the 'LC' designation) operates down to 2.5V, allowing direct connection to two AA alkaline cells (3V nominal) for years of service. The 4 MHz operation at 2.5V draws approximately 2 mA active, manageable for duty-cycled sleep modes. The 5-channel ADC digitizes temperature, humidity, and battery voltage sensors. The USART wakes the radio module only during transmission bursts. Brown-out reset provides graceful shutdown at 2.3V battery cutoff, preserving data integrity. The TQFP-44 surface-mount package supports miniaturized sensor PCB designs. The OTP memory prevents accidental firmware corruption during field deployment where Flash-based parts would be vulnerable to bit flips from ESD events.
Recommended
Automotive Body Electronics
The PIC16LC65A-04/PT (or its industrial-temp variant PIC16LC65A-04I/PT) targets automotive body electronics such as seat controllers, mirror adjusters, and interior lighting modules. The 33 I/O pins drive multiple DC motors via H-bridge drivers, read Hall-effect position sensors, and control LED current sources for ambient lighting. The USART interfaces to LIN bus transceivers for body control network communication. The 5-channel ADC reads battery voltage, current shunts, and temperature sensors. Watchdog timer recovers from load-dump voltage transients on the 12V automotive bus. Brown-out reset at 4.0V prevents false actuator commands during engine cranking when battery voltage dips below 6V. The TQFP-44 package withstands automotive underhood temperatures up to 105C with industrial-grade -40C to +85C silicon. Note: AEC-Q100 qualification requires the PIC16F77-I/PT automotive variant.