PIC16LC65AT-04/PT - 8-bit MCU, 7KB OTP, 4MHz, 44-TQFP | Microchip
MPN: PIC16LC65AT-04/PT ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.5 | $7.50 |
| 10 | $6.75 | $67.50 |
| 100 | $5.95 | $595.00 |
| 500 | $5.2 | $2,600.00 |
| 1,000 | $4.65 | $4,650.00 |
PIC16LC65AT-04/PT Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + RAM), and peripheral interfaces. Within the broader taxonomy, an MCU belongs to the category of microcontrollers, which in turn fall under embedded processors and digital ICs. The PIC16C family specifically targets low-cost, high-performance 8-bit applications using a Harvard-architecture RISC core with a small, deterministic instruction set ideal for real-time control.
Key features of the PIC16LC65AT-04/PT include a 14-bit wide instruction word, an integrated watchdog timer, power-saving SLEEP mode, and parallel slave port support. The wide 2.5 V to 6.0 V supply range allows operation from both 3.3 V and 5 V rails commonly used in industrial and consumer designs. The 'LC' suffix denotes the low-power CMOS process variant, and the 'T' denotes tape-and-reel packaging for high-volume assembly.
The device uses a fully-static CMOS design, allowing the clock to be stopped and restarted without losing internal state - a key feature for low-power sleep/wake duty-cycled applications. With 33 I/O lines, designers have ample connectivity for sensors, buttons, displays, and external peripheral chips.
Typical applications include industrial control panels, simple sensor interfaces, low-cost motor control, appliance control boards, and embedded data-acquisition front ends. The integrated I2C/SPI/UART peripherals make it well suited as a communication gateway or slave controller. The 44-TQFP package provides a manageable footprint for hand-rework-friendly prototypes while remaining compatible with automated SMT lines.
When designing with this device, note that OTP memory cannot be reprogrammed, so code must be fully validated before committing. For new designs, consider migrating to the flash-based PIC16F877A or PIC16F887 family (same 44-pin TQFP footprint, drop-in compatible pinout) to enable in-system reprogramming and shorter development cycles.
This page synthesizes current distributor pricing, drop-in compatible Microchip alternatives from the same PIC16 family, and practical design guidance not found in the bare datasheet.
Drop-in alternatives for PIC16LC65AT-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 PIC16LC65AT-04/PT (same form factor and footprint) — differing in ADC, Program Memory Size, Program Memory Type, Timers, RAM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16F877A-I/PT
✅ Drop-In✓ In Stock
$4.95 / Unit
View Datasheet →PIC16F877-04/PT
✅ Drop-In✓ In Stock
$5.2 / Unit
View Datasheet →PIC16F887-I/PT
✅ Drop-In✓ In Stock
$1.66 / Unit
View Datasheet →PIC16LC65A-04I/PQ
✅ Drop-In✓ In Stock
$5.3 / Unit
View Datasheet →PIC16LC65A-04/PQ
✅ Drop-In✓ In Stock
$6.5 / Unit
View Datasheet →PIC16F914-I/PT
✅ Drop-In✓ In Stock
$2.98 / Unit
View Datasheet →PIC16LC65AT-04/PT Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Program Memory Size | 7 KB (4K x 14) OTP |
| RAM Size | 192 x 8 bytes |
| Maximum CPU Speed | 4 MHz |
| Supply Voltage Range | 2.5 V to 6.0 V |
| Number of I/O Pins | 33 |
| Package / Case | 44-TQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Peripherals | I2C, SPI, UART/USART |
| Instruction Word Width | 14-bit |
| Oscillator Type | External |
| Connectivity | I2C, SPI, UART/USART |
| Program Memory Type | OTP (One-Time Programmable) |
| RoHS Status | unknown |
PIC16LC65AT-04/PT Pin Configuration
| Pin 1 | OSC1/CLKIN — Oscillator input or external clock input |
| Pin 2 | OSC2/CLKOUT — Oscillator output or clock output |
| Pin 3 | MCLR/VPP — Master clear reset or programming voltage input |
| Pin 4 | RA0 — PORTA bit 0 (digital I/O or analog input AN0) |
| Pin 5 | RA1 — PORTA bit 1 (digital I/O or analog input AN1) |
| Pin 6 | RA2 — PORTA bit 2 (digital I/O or analog input AN2) |
| Pin 7 | RA3 — PORTA bit 3 (digital I/O or analog input AN3) |
| Pin 8 | RA4 — PORTA bit 4 (digital I/O, open-drain) |
| Pin 9 | RA5 — PORTA bit 5 (digital I/O or analog input AN4) |
| Pin 10 | VSS — Ground reference |
| Pin 11 | VDD — Positive supply voltage (2.5 V to 6.0 V) |
| Pin 12 | RB0/INT — PORTB bit 0 / external interrupt |
| Pin 13 | RB1 — PORTB bit 1 |
| Pin 14 | RB2 — PORTB bit 2 |
| Pin 15 | RB3 — PORTB bit 3 |
| Pin 16 | RB4 — PORTB bit 4 |
| Pin 17 | RB5 — PORTB bit 5 |
| Pin 18 | RB6 — PORTB bit 6 / in-circuit debugger pin |
| Pin 19 | RB7 — PORTB bit 7 / in-circuit debugger pin |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply voltage |
| Pin 22 | RC0 — PORTC bit 0 (digital I/O or timer1 oscillator) |
| Pin 23 | RC1 — PORTC bit 1 (digital I/O or timer1 oscillator) |
| Pin 24 | RC2 — PORTC bit 2 (digital I/O or CCP1) |
| Pin 25 | RC3 — PORTC bit 3 (digital I/O or SCL/I2C clock) |
| Pin 26 | RC4 — PORTC bit 4 (digital I/O or SDA/I2C data) |
| Pin 27 | RC5 — PORTC bit 5 (digital I/O or SDO) |
| Pin 28 | RC6 — PORTC bit 6 (digital I/O or TX/CK) |
| Pin 29 | RC7 — PORTC bit 7 (digital I/O or RX/DT) |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply voltage |
| Pin 32 | RD0 — PORTD bit 0 (digital I/O or PSP data) |
| Pin 33 | RD1 — PORTD bit 1 (digital I/O or PSP data) |
| Pin 34 | RD2 — PORTD bit 2 (digital I/O or PSP data) |
| Pin 35 | RD3 — PORTD bit 3 (digital I/O or PSP data) |
| Pin 36 | RD4 — PORTD bit 4 (digital I/O or PSP data) |
| Pin 37 | RD5 — PORTD bit 5 (digital I/O or PSP data) |
| Pin 38 | RD6 — PORTD bit 6 (digital I/O or PSP data) |
| Pin 39 | RD7 — PORTD bit 7 (digital I/O or PSP data) |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply voltage |
| Pin 42 | RE0 — PORTE bit 0 (digital I/O or AN5 / RD) |
| Pin 43 | RE1 — PORTE bit 1 (digital I/O or AN6 / WR) |
| Pin 44 | RE2 — PORTE bit 2 (digital I/O or AN7 / CS) |
Typical Applications
PIC16LC65AT-04/PT is suitable for 6 applications: Industrial Control Panels, Appliance Control Boards, Sensor Interface / Data Acquisition Front End, Simple Motor and Solenoid Drivers, Communication Gateway / Protocol Bridge, Embedded Data Logger (Sensor to EEPROM).
Industrial Control Panels
The PIC16LC65AT-04/PT fits industrial control panel designs that need a deterministic 8-bit core, 33 I/O lines for keypads and indicator LEDs, and reliable serial communication to downstream drivers. Its 2.5 V to 6.0 V supply tolerates the unregulated 24 V-to-5 V rails typical in factory equipment. The 4 MHz clock is sufficient for scan-loop polling of switches and PWM-driven buzzers. Compared with switching to a 32-bit MCU, this part keeps BOM cost low for high-volume appliance and panel products.
Recommended
Appliance Control Boards
White-goods and small appliance controllers benefit from the PIC16LC65AT-04/PT's low power consumption, integrated I2C/SPI/UART, and 44-TQFP SMT compatibility with automated assembly lines. Its 7 KB OTP program memory is well-matched to fixed-function firmware (wash cycles, fan speed control, sensor readouts). The wide voltage range lets the same design operate from 3.3 V battery-backed or 5 V mains-derived rails. For cost-sensitive high-volume runs, OTP is actually preferred to lock firmware against field tampering.
Recommended
Sensor Interface / Data Acquisition Front End
Use the PIC16LC65AT-04/PT as a low-cost sensor hub that aggregates readings from I2C or SPI sensors and reports them over UART to a host processor. Its 4 MHz clock and 192-byte RAM can comfortably handle polled sensor reads at 10-100 Hz with light averaging. The 33 I/O pins support multiple chip-select lines for SPI sensor stacks. As a slave controller in a larger embedded system, it offloads housekeeping from the main application processor, freeing it for higher-level tasks.
Recommended
Simple Motor and Solenoid Drivers
The PIC16LC65AT-04/PT can drive low-side MOSFET switches or relays for small DC motors and solenoids through its GPIO pins. Its 4 MHz instruction rate easily generates PWM at audio-subsonic frequencies for motor-speed or valve-position control. The integrated UART allows command input from a master controller, while SPI/I2C connect to position encoders or current sensors. OTP memory locks the safety-critical control algorithm, preventing accidental firmware changes in the field.
Recommended
Communication Gateway / Protocol Bridge
Deploy the PIC16LC65AT-04/PT as a bridge between I2C sensor networks and a UART-attached host (PC, modem, or another MCU). Its three hardware serial peripherals (I2C, SPI, UART) let it translate between buses without software bit-banging, reducing CPU load. 192 bytes of RAM is enough for short packet buffers in polling-mode bridges. For industrial Modbus-RTU or similar protocols, the deterministic instruction timing simplifies timing-budget calculations versus 32-bit Cortex-M parts.
Recommended
Embedded Data Logger (Sensor to EEPROM)
Pair the PIC16LC65AT-04/PT with an external I2C EEPROM to build a compact data logger for unattended sensor recording. The 4 MHz core, watchdog timer, and SLEEP mode enable long battery life by waking periodically, sampling, and returning to sleep. UART output allows log retrieval without removing the device. OTP firmware locks the recording algorithm, ensuring field deployments cannot be accidentally reprogrammed. The 44-TQFP package suits conformal-coated outdoor or industrial enclosures.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC65AT-04/PT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F877A-I/PT | PIC16F877-04/PT | PIC16F887-I/PT | PIC16LC65A-04I/PQ | PIC16F914-I/PT |
|---|---|---|---|---|---|---|
| Package | 44-TQFP (10x10 mm) | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-TQFP (10x10 mm) - same | 44-MQFP (PQ) - same die, different package | 44-TQFP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP (7 KB) | Flash (14 KB) | Flash (14 KB) | Flash (14 KB) | OTP (7 KB) | Flash (14 KB) |
| Program Memory Size | 7 KB (4K x 14) | 14 KB (8K x 14) | 14 KB (8K x 14) | 14 KB (8K x 14) | 7 KB (4K x 14) | 14 KB (8K x 14) |
| RAM Size | 192 x 8 bytes | 368 x 8 bytes | 368 x 8 bytes | 368 x 8 bytes | 192 x 8 bytes | 368 x 8 bytes |
| Maximum CPU Speed | 4 MHz | 20 MHz | 4 MHz | 20 MHz | 4 MHz | 20 MHz |
| Number of I/O Pins | 33 | 33 | 33 | 36 | 33 | 36 |
| Supply Voltage Range | 2.5 V to 6.0 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.5 V to 6.0 V | 2.0 V to 3.6 V |
| Peripherals | I2C, SPI, UART/USART | I2C, SPI, UART/USART, ADC | I2C, SPI, UART/USART, ADC | I2C, SPI, UART/USART, ADC, nanoWatt | I2C, SPI, UART/USART | I2C, SPI, UART/USART, LCD driver |
| Lifecycle Status | NRND | Active | Active | Active | NRND | Active |
Key Differentiators
- Flash-based reprogrammability (vs PIC16LC65A-04I/PQ)
- Higher CPU clock headroom (vs PIC16F877-04/PT)
- Long-term availability (vs PIC16F914-I/PT)
Design Notes
The PIC16LC65AT-04/PT uses OTP (One-Time Programmable) memory, so each unit can only be programmed once. Validate firmware on a flash-based equivalent (PIC16F877A-I/PT) or a socketed PIC16C65A development setup before committing to OTP production. Programming errors or firmware bugs discovered after programming result in scrapped silicon.
Decouple VDD with a 100 nF ceramic capacitor placed within 5 mm of each VDD pin (the device has multiple VDD pins on a 44-TQFP). Add a bulk 10 uF tantalum or aluminum polymer capacitor at the board's supply input. The PIC16LC65A family is sensitive to supply ripple during ADC conversions if used; keep analog and digital VDD traces short and separated if mixing analog and digital loads.
For the 44-TQFP (10x10 mm) package, route traces on a 4-layer PCB with a continuous ground plane beneath the IC. Keep the MCLR/VPP trace short and add a 10 kohm pull-up to VDD; if in-circuit programming is desired, expose the ICSP pins (RB6/RB7, MCLR) to a 5-pin header. Avoid long parallel runs to high-frequency signals to reduce crosstalk into the analog-input capable PORTA pins.
Compliance Information
RoHS and REACH compliance status not explicitly stated in verified distributor data; Microchip's product environmental compliance documents should be consulted for definitive answers. Part is not AEC-Q100 qualified (industrial/commercial grade only).