PIC16LC662-04I/PT - 7KB OTP 8-bit MCU 33 I/O | Microchip
MPN: PIC16LC662-04I/PT β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.95 | $8.95 |
| 10 | $7.92 | $79.20 |
| 100 | $6.45 | $645.00 |
| 500 | $5.1 | $2,550.00 |
| 1,000 | $4.25 | $4,250.00 |
PIC16LC662-04I/PT Overview
A PIC16C-series microcontroller is a CMOS 8-bit MCU based on a RISC Harvard architecture with separate program and data buses, a small fixed instruction set, and on-chip peripherals targeted at embedded control. The PIC16C family sits in Microchip's PIC hierarchy as: PIC16C -> PIC16 mid-range -> 8-bit PIC -> PIC MCU -> microcontroller -> embedded processor -> semiconductor. The LC sub-family specifically operates from 2.5V to 6.0V with reduced supply current compared to the standard C version, suiting battery-powered or 3.3V/5V mixed-voltage systems.
Key features include a 14-bit instruction word, 8-level hardware stack, up to 33 I/O pins with individual direction control, an integrated analog comparator, a watchdog timer with on-chip RC oscillator, and programmable code protection. The OTP program memory allows one-time factory or in-circuit programming, providing a low-cost solution for production volumes where firmware is finalized. Power-on reset, brown-out reset, and a programmable oscillator start-up timer simplify firmware bring-up.
Typical applications include industrial automation controllers, automotive body and chassis subsystems (non-safety-critical), consumer appliance control boards, HVAC thermostats, and embedded sensor front-ends. The wide operating voltage (2.5V to 6.0V) and industrial temperature range (-40C to +85C) make it well suited for factory-floor equipment, while its 33 I/O pins give enough headroom for keypads, displays, and relays in a single chip.
When designing with this device, allocate enough board area for the TQFP-44 footprint (0.8 mm pitch) and use a 4-layer PCB with a solid ground plane for noise immunity on the analog comparator inputs. Ensure in-circuit serial programming (ICSP) header access is preserved on the PCB so firmware can be updated without removing the OTP part, even though it cannot be reprogrammed in the field.
Drop-in alternatives for PIC16LC662-04I/PT 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 PIC16LC662-04I/PT (same form factor and footprint) β differing in Program Memory Size, RAM Size, Mounting Type, RoHS Status, ADC.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16F662-I/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16C662-04/PT
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
PIC16LC662-04/L
β Drop-Inβ In Stock
$4.95 / Unit
View Datasheet βPIC16LC66-04I/SO
β Drop-Inβ In Stock
$2.78 / Unit
View Datasheet βPIC16F747-I/PT
β Drop-Inπ Reference alternative (not in catalog)
PIC16LC662-04I/PT Maximum Ratings & Electrical Characteristics
| Core Processor | PIC |
| Core Size | 8-bit |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 176 x 8 (176 bytes) |
| EEPROM Size | None (external only) |
| Number of I/O | 33 |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 200 ns |
| Supply Voltage Range | 3.0 V to 6.0 V |
| Operating Temperature Range | -40C to +85C (industrial) |
| Package / Case | 44-pin TQFP (10x10 mm, 0.8 mm pitch) |
| Mounting Type | Surface Mount |
| Oscillator Type | External |
| Instruction Set | 35 single-cycle instructions |
| Peripherals | Brown-out reset, watchdog timer, analog comparator, POR |
| MSL Level | 3 (168 hours) |
| RoHS Status | Compliant |
PIC16LC662-04I/PT Pin Configuration
| Pin 1 | RB7 β PORTB bit 7 (ICSP PG data) |
| Pin 2 | RB6 β PORTB bit 6 (ICSP PGC clock) |
| Pin 3 | RB5 β PORTB bit 5 |
| Pin 4 | RB4 β PORTB bit 4 |
| Pin 5 | RB3 β PORTB bit 3 |
| Pin 6 | RB2 β PORTB bit 2 |
| Pin 7 | RB1 β PORTB bit 1 |
| Pin 8 | RB0 β PORTB bit 0 (interrupt) |
| Pin 9 | RC0 β PORTC bit 0 |
| Pin 10 | RC1 β PORTC bit 1 |
| Pin 11 | RC2 β PORTC bit 2 |
| Pin 12 | RC3 β PORTC bit 3 |
| Pin 13 | RC4 β PORTC bit 4 |
| Pin 14 | RC5 β PORTC bit 5 |
| Pin 15 | RC6 β PORTC bit 6 (TX) |
| Pin 16 | RC7 β PORTC bit 7 (RX) |
| Pin 17 | RD0 β PORTD bit 0 |
| Pin 18 | RD1 β PORTD bit 1 |
| Pin 19 | RD2 β PORTD bit 2 |
| Pin 20 | RD3 β PORTD bit 3 |
| Pin 21 | RD4 β PORTD bit 4 |
| Pin 22 | RD5 β PORTD bit 5 |
| Pin 23 | RD6 β PORTD bit 6 |
| Pin 24 | RD7 β PORTD bit 7 |
| Pin 25 | VSS β Ground |
| Pin 26 | VDD β Positive supply (3.0-6.0 V) |
| Pin 27 | RE0 β PORTE bit 0 |
| Pin 28 | RE1 β PORTE bit 1 |
| Pin 29 | RE2 β PORTE bit 2 |
| Pin 30 | OSC1 β Oscillator input |
| Pin 31 | OSC2 β Oscillator output |
| Pin 32 | RA0 β PORTA bit 0 / AN0 |
| Pin 33 | RA1 β PORTA bit 1 / AN1 |
| Pin 34 | RA2 β PORTA bit 2 / AN2 / VREF- |
| Pin 35 | RA3 β PORTA bit 3 / AN3 / VREF+ |
| Pin 36 | RA4 β PORTA bit 4 (open-drain) |
| Pin 37 | RA5 β PORTA bit 5 |
| Pin 38 | VSS β Ground |
| Pin 39 | VDD β Positive supply (3.0-6.0 V) |
| Pin 40 | MCLR β Master clear reset (active low) |
Typical Applications
PIC16LC662-04I/PT is suitable for 6 applications: Industrial Automation Controllers, HVAC Thermostat Control, Consumer Appliance Control Boards, Automotive Body and Chassis Modules, Embedded Sensor Front-Ends, User Interface Keypad / Display Boards.
Industrial Automation Controllers
The PIC16LC662-04I/PT fits industrial automation controllers because it combines 33 I/O pins, 7 KB of OTP program memory, and a -40C to +85C industrial temperature rating in a single 44-pin TQFP. In a typical PLC-style I/O module, the MCU scans digital inputs, drives relay or SSR outputs, and communicates over RS-485 or UART. Its 3.0 V to 6.0 V supply range lets it run directly from a 5 V regulated rail, and the 200 ns instruction cycle keeps 1 ms control loops well within budget. The watchdog timer and brown-out reset add the robustness needed for factory-floor environments with noisy supplies.
Recommended
HVAC Thermostat Control
The PIC16LC662-04I/PT suits HVAC thermostat designs because its 33 I/O pins can drive a 7-segment LCD or character display, scan a keypad matrix, and read multiple temperature sensors through the analog comparator. Operating from 3.0 V to 6.0 V lets it share a 5 V rail with the relay driver stage, while OTP memory locks the firmware at production cost. The integrated brown-out reset and power-on reset prevent undefined behavior during brown-outs on the HVAC transformer supply. The PIC16C662 family is widely deployed in legacy thermostat designs, with the LC variant providing lower power consumption for battery-backed thermostats.
Recommended
Consumer Appliance Control Boards
The PIC16LC662-04I/PT powers consumer appliance controllers such as washing machines, microwave ovens, and dishwashers where cost-sensitive OTP memory and a moderate pin count are ideal. Its 35 single-cycle instructions and 4 MHz max clock keep firmware simple and deterministic for motor-control sequencing. The 33 I/O pins drive keypad inputs, LED indicators, buzzer PWM, and triac-fired heater loads. Operating from 3.0 V to 6.0 V simplifies the power supply by running directly off a rectified 5 V rail. The watchdog timer recovers the MCU from firmware lock-ups caused by EMI from the triac switching.
Recommended
Automotive Body and Chassis Modules
The PIC16LC662-04I/PT is used in non-safety automotive body and chassis subsystems such as lighting controllers, seat adjusters, and HVAC blend-door actuators. Its -40C to +85C industrial temperature range covers most cabin environments, and its 33 I/O pins comfortably handle multiple switch inputs, LED drivers, and LIN-bus transceivers. The OTP memory locks the calibration data at production, preventing field tampering. However, for under-hood or safety-critical designs, Microchip recommends AEC-Q100-qualified PIC16 variants like PIC16F1936-I/PT to meet automotive stress requirements.
Recommended
Embedded Sensor Front-Ends
The PIC16LC662-04I/PT serves as the controller in distributed sensor front-ends such as environmental monitors, smart meters, and IoT edge nodes. Its analog comparator enables direct connection of analog sensor outputs without an external op-amp, while the 33 I/O pins drive multiple sensor channels. The wide 3.0 V to 6.0 V supply range accepts a 3.3 V or 5 V rail and the low quiescent current of the LC sub-family suits battery-backed installations. OTP memory locks the sensor calibration coefficients at factory programming, ensuring consistent measurement accuracy.
Recommended
User Interface Keypad / Display Boards
The PIC16LC662-04I/PT drives user interface boards with 4x4 keypads, character LCDs, and rotary encoders. Its 33 I/O pins support an 8-bit data bus plus control lines for an HD44780 LCD, with leftover pins for keypad scanning. The 200 ns instruction cycle debounces keypad inputs in firmware without external capacitors. Operating from 5 V lets the PIC drive the LCD contrast circuit directly. The on-chip analog comparator can also monitor the encoder quadrature signal, simplifying firmware.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC662-04I/PT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F662-I/PT | PIC16C662-04/PT | PIC16LC662-04/L | PIC16LC66-04I/SO | PIC16F747-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 | TQFP-44 - same | TQFP-44 - same | TQFP-44 - same | SOIC-28 - different | TQFP-44 - same family |
| Program Memory | 7 KB OTP | 14 KB Flash | 7 KB OTP | 7 KB OTP | 14 KB OTP | 7 KB Flash |
| RAM Size | 176 B | 176 B | 176 B | 176 B | 368 B | 368 B |
| Number of I/O | 33 | 33 | 33 | 33 | 22 | 28 |
| Max Clock Frequency | 4 MHz | 20 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz |
| Supply Voltage | 3.0-6.0 V | 2.0-5.5 V | 4.5-6.0 V | 3.0-6.0 V | 2.5-6.0 V | 2.0-5.5 V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C | -40C to +85C | -40C to +85C |
| Memory Type | OTP | Flash | OTP | OTP | OTP | Flash |
Key Differentiators
- Field-reprogrammable Flash vs OTP (vs PIC16C662-04/PT)
- Low-voltage CMOS operation vs standard CMOS (vs PIC16C662-04/PT)
- 44-pin TQFP for high I/O count (vs PIC16LC66-04I/SO)
Design Notes
Place a 0.1 uF ceramic decoupling capacitor within 5 mm of each VDD pin (pins 26 and 39), and add a bulk 10 uF tantalum or aluminum capacitor on the main 5 V rail. According to Microchip's PIC16C662 datasheet, the LC sub-family draws approximately 2 mA at 4 MHz and 5 V, but supply current can spike to 10 mA during OTP programming. Use a linear regulator with at least 100 mA headroom if the same rail drives relays or LEDs. Add a 10 kohm pull-up on MCLR (pin 40) and a 100 nF cap to ground for clean reset behavior.
The TQFP-44 package uses a 0.8 mm pin pitch, which requires careful PCB layout. Use a 4-layer PCB with a solid ground plane under the MCU to provide a stable reference for the analog comparator inputs (RA0-RA3) and to minimize EMI coupling into OSC1/OSC2. Per IPC-2221 design standards, the trace width from the regulator to VDD should be at least 0.3 mm to handle inrush during programming. Reserve a 5-pin ICSP header on the PCB (VPP/MCLR, VDD, VSS, PGD, PGC) so firmware can be written to the OTP memory in-circuit even after PCB assembly.
Common design pitfalls with the PIC16LC662-04I/PT include: (1) using a 20 MHz crystal on the -04 speed grade part - this part is rated to 4 MHz only; choose the -20 speed grade if higher clock is needed. (2) Forgetting to configure the watchdog timer (WDT) timeout in the CONFIG register; the default WDT is enabled and may reset the MCU unexpectedly. (3) Using analog inputs on RA0-RA3 without configuring the A/D converter or comparator - the pins default to digital I/O. (4) Exceeding 6.0 V on VDD permanently damages the part - add a TVS diode if the supply is unregulated.
Compliance Information
RoHS compliant per Microchip product page. Not AEC-Q100 qualified; for automotive applications use AEC-Q100-qualified PIC16F1936-I/PT or similar.
