PIC16LC662T-04I/PQ - 8-Bit OTP MCU, 7KB, 4MHz, 44-MQFP | Microchip
MPN: PIC16LC662T-04I/PQ ✗ 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 |
PIC16LC662T-04I/PQ Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU, non-volatile program memory, volatile data RAM, and peripheral interfaces into one package. PIC16C-series MCUs use a Harvard-architecture RISC core optimised for deterministic instruction timing and low static power, making them well suited to deterministic control loops. The 'LC' voltage-class designation indicates the low-voltage CMOS process variant, and the OTP memory allows one-time factory or in-circuit programming, which is appropriate for low-cost high-volume products.
Key features of the PIC16LC662T-04I/PQ include a 4 MHz maximum external clock, 7KB OTP for program storage (4096 words x 14 bits), 176 bytes of general-purpose RAM, 33 I/O pins multiplexed with peripheral functions, a programmable watchdog timer with on-chip RC oscillator, a power-saving SLEEP mode, and an operating temperature range of -40 C to +85 C for the industrial-grade 'I' suffix. The 44-MQFP (J-lead) package offers gull-wing leads on all four sides and a low-profile footprint well suited to surface-mount assembly on standard 44-pin QFP land patterns.
In typical use, the PIC16LC662T-04I/PQ is paired with an external 4 MHz crystal or resonator, a 5 V LDO regulator, and decoupling capacitors on each supply pin. The 35-instruction set keeps firmware development simple, and Microchip's MPLAB X IDE plus MPASM / XC8 toolchain support legacy assembly and modern C development. Industrial control boards, low-end appliances, and sensor-interface front-ends are common targets.
Engineers should note that this part belongs to the PIC16C OTP family - it is one-time programmable and cannot be field-erased, so production firmware must be fully validated before programming. Designers should also verify that the 44-MQFP land pattern matches their PCB footprint; a 44-LCC (PLCC) variant (suffix /L) is mechanically different and not drop-in compatible.
This page synthesizes distributor pricing, lifecycle indicators, drop-in compatible alternatives within the PIC16C family, and practical design notes that go beyond the manufacturer datasheet to help engineers evaluating the PIC16LC662T-04I/PQ for new designs or legacy maintenance.
Drop-in alternatives for PIC16LC662T-04I/PQ — 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 PIC16LC662T-04I/PQ (same form factor and footprint) — differing in Package, ADC, Program Memory Type, Timers, Program Memory Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC65B-04/PQ
✅ Drop-In✓ In Stock
$2.5 / Unit
View Datasheet →PIC16LC65A-04I/PQ
✅ Drop-In✓ In Stock
$5.3 / Unit
View Datasheet →PIC16LC65BT-04I/PQ
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →PIC16LC65A-04I/P
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC16LC66-04I/SO
✅ Drop-In✓ In Stock
$2.78 / Unit
View Datasheet →PIC16LC662T-04I/PQ Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16C 8-bit RISC (Harvard) |
| Instruction Set Size | 35 instructions |
| Program Memory Type | OTP (One-Time-Programmable) ROM |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM Size | 176 x 8 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Cycle Time | 200 ns (single-cycle, 2-cycle branches) |
| Supply Voltage Range | 4.5 V to 6.0 V (nominal 5.0 V) |
| Number of I/O Pins | 33 |
| Oscillator Type | External |
| Package / Case | 44-MQFP (J-Lead), 10 mm x 10 mm |
| Operating Temperature Range | -40 C to +85 C (Industrial 'I' suffix) |
| Mounting Type | Surface Mount |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Power-Saving SLEEP Mode | Yes |
PIC16LC662T-04I/PQ 44-mqfp (j-lead), 10 mm x 10 mm Pin Configuration Guide
Pin configuration for PIC16LC662T-04I/PQ (44-mqfp (j-lead), 10 mm x 10 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 PIC16LC662T-04I/PQ.
Refer to the datasheet for full pin configuration.
Typical Applications
PIC16LC662T-04I/PQ is suitable for 6 applications: Industrial Control Front-End, Low-End Appliance Control Board, Sensor Interface Module, Hobby / Education Development Platform, Automotive Body Electronics (legacy 12 V subsystems), Legacy Product Maintenance / Field Replacement.
Industrial Control Front-End
The PIC16LC662T-04I/PQ fits industrial control front-ends thanks to its 33 I/O pins, integrated watchdog timer with on-chip RC oscillator, and industrial-grade -40 C to +85 C operating range. The 5 V supply rail matches 24V-bus-derived 5 V rails that are common on factory PLC cards, and the 4 MHz clock gives 200 ns deterministic instruction timing for servo and stepper pulse generation. Place the part on a 44-MQFP footprint with a 7805 LDO upstream and a 4 MHz crystal or resonator on OSC1/OSC2; for noise immunity, route VDD/VSS pairs through 100 nF X7R ceramic decoupling within 5 mm of each pin.
Recommended
Low-End Appliance Control Board
White-goods and small appliance control boards (rice cookers, washing-machine sub-modules, microwave keypads) are a typical target for the PIC16LC662T-04I/PQ. The 7 KB OTP holds full state-machine and timing logic for a single-function product, and the 33 I/O drive LED indicators, keypads, triac interfaces, and EEPROM chips. Because the part is OTP, factory programming via MPLAB IPE locks the firmware for the entire production run, eliminating field-tampering risk. Use snubber circuits and opto-isolators on the mains-side I/O, and route the crystal traces short and guarded to avoid 50/60 Hz interference.
Recommended
Sensor Interface Module
The PIC16LC662T-04I/PQ is well-suited to sensor-interface modules that aggregate several analog signals and digital sensors and forward processed data via UART or SPI. The on-chip analog comparator combined with external ADC front-ends provides a low-cost mixed-signal hub, and the 176 bytes of RAM are sufficient for averaging and peak detection of vibration or temperature channels. The RISC core's single-cycle instruction time of 200 ns at 4 MHz makes it easy to maintain a 1 kHz sample loop without interrupt jitter, and the SLEEP mode plus watchdog timer keep quiescent power low in battery-assisted sensor nodes.
Recommended
Hobby / Education Development Platform
The PIC16LC662T-04I/PQ and its PIC16C family siblings are widely used in university embedded-systems courses and hobby projects because of their simple 35-instruction RISC core and broad MPLAB X IDE support. The 44-MQFP J-lead package is breadboard-friendly with a TQFP-to-DIP adapter, and the in-circuit serial programming (ICSP) interface allows students to flash the OTP array on a development board. Code examples for timers, interrupts, UART, and ADC peripherals are abundant in Microchip application notes and academic literature, making this an excellent teaching MCU.
Recommended
Automotive Body Electronics (legacy 12 V subsystems)
Within legacy automotive body-electronics subsystems such as interior lighting controllers, seat-position memories, and accessory timers, the PIC16LC662T-04I/PQ is sometimes used where a 5 V regulated rail is already present. The industrial temperature grade covers -40 C to +85 C cabin environments, and the watchdog timer recovers the MCU from voltage transients on the 12 V bus. Note that AEC-Q100 qualified automotive projects should select an explicitly automotive-grade PIC16F or dsPIC successor; the LC662 family is NRND and not AEC-Q100 listed.
Recommended
Legacy Product Maintenance / Field Replacement
Because the PIC16LC662T-04I/PQ is NRND but still in production for spare-parts supply, a primary application is field-replacement and maintenance of legacy equipment where the original firmware is already validated and a re-design is uneconomic. Stocking the part on distributor shelves allows service depots to repair installed bases of industrial controllers, medical-instrument sub-assemblies, and consumer electronics that were built around this PIC16C MCU. Engineering teams should pair each repair with a forward-looking roadmap to migrate to a flash-based PIC16F or PIC18 equivalent.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC662T-04I/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC65B-04/PQ | PIC16LC65A-04I/PQ | PIC16LC65BT-04I/PQ | PIC16LC65A-04I/P | PIC16LC66-04I/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (J-Lead, PQ) 10x10 mm | 44-MQFP (J-Lead, PQ) - same | 44-MQFP (J-Lead, PQ) - same | 44-MQFP (J-Lead, PQ) - same | 44-MQFP (J-Lead, PQ) - same | 44-MQFP J-Lead (PQ family) - same |
| Core / Family | PIC16C 8-bit RISC | PIC16C 8-bit RISC | PIC16C 8-bit RISC | PIC16C 8-bit RISC | PIC16C 8-bit RISC | PIC16C 8-bit RISC |
| Program Memory | 7 KB OTP (4K x 14) | 7 KB OTP (4K x 14) | 4 KB OTP (2K x 14) | 7 KB OTP (4K x 14) | 4 KB OTP (2K x 14) | 8K-14K OTP |
| Data RAM | 176 x 8 bytes | 176 x 8 bytes | 128-192 bytes | 176 x 8 bytes | 128-192 bytes | 256-368 bytes |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Supply Voltage Range | 4.5 V to 6.0 V | 4.5 V to 6.0 V | 4.5 V to 6.0 V | 4.5 V to 6.0 V | 4.5 V to 6.0 V | 4.5 V to 6.0 V |
| Operating Temperature | -40 C to +85 C (I grade) | 0 C to +70 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
Key Differentiators
- Largest OTP code space in the PIC16LC65x MQFP-44 family at 7 KB (vs PIC16LC65A-04I/PQ)
- 33 I/O pins with PIC16C6xx peripheral set including USART and analog comparator (vs PIC16LC65A-04I/P)
- Industrial -40 C to +85 C grade option with the 'I' suffix (vs PIC16LC662T-04/PQ (no 'I'))
Design Notes
Power the PIC16LC662T-04I/PQ from a 5 V +/-5% rail derived from a 7805 or MCP1700 LDO. Place a 100 nF X7R decoupling capacitor within 5 mm of each VDD pin pair, and add a bulk 10 uF tantalum or aluminum-polymer capacitor on the board-side power entry. The 'LC' voltage class requires a minimum 4.5 V supply; operation below 4.5 V is not guaranteed and may cause EEPROM corruption or program-fetch errors.
Route the OSC1/OSC2 traces short and symmetric, with a guard ground on one side and the load capacitors (typically 15-33 pF for a 4 MHz crystal) placed within 5 mm of the IC. Keep clock traces away from switching power or relay-coil traces that can inject 50/60 Hz interference. The 44-MQFP J-lead package requires a land pattern per IPC-7351 with a 0.8 mm pitch and 1.0 mm lead span - verify the PCB footprint matches the Microchip package drawing before fab-out.
The PIC16LC662T-04I/PQ is OTP, so firmware must be fully validated before programming. A single bad write is permanent; there is no field-erase. If the design might need firmware updates, select a flash-based PIC16F or PIC18 equivalent in the same 44-MQFP footprint. Also verify the MCLR/VPP pin is tied to VDD through a 10 kohm resistor with a 100 nF capacitor for power-on reset; an open MCLR pin can cause intermittent start-up failures in noisy environments.
PORTB weak pull-ups are software-controlled and useful for switch-matrix keypads, but disable them on pins used as outputs or analog comparator inputs to avoid contention. The analog comparator input pins share the digital I/O structure; route them with a guard ground if they sit next to high-frequency switching signals such as PWM or USART. For external interrupt usage, INT pin edges are software-configured; debounce mechanical switches in software with a 5-10 ms timer rather than relying on hardware RC filters alone.
Compliance Information
Compliance status not specified in the verified web data - RoHS, REACH, lead-free, halogen-free and conflict-minerals fields are set to 'unknown'. The PIC16LC662T-04I/PQ is industrial temperature grade ('I' suffix = -40 C to +85 C) but is NRND and not AEC-Q100 qualified; automotive projects should select an explicit automotive-grade PIC16F or dsPIC equivalent.
