PIC16LC67T-04/PQ - 4MHz 8-Bit MCU 14KB OTP 44-MQFP | Microchip
MPN: PIC16LC67T-04/PQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.42 | $9.42 |
| 10 | $8.75 | $87.50 |
| 100 | $7.95 | $795.00 |
| 500 | $7.1 | $3,550.00 |
| 1,000 | $6.5 | $6,500.00 |
PIC16LC67T-04/PQ Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory, and peripherals on one silicon die. Within the broader taxonomy, the PIC16LC67 sits in the PIC16C mid-range family, which belongs to the Microchip PIC mid-range architecture, a Harvard RISC design optimized for deterministic instruction execution. The PIC16C6X family uses a 14-bit instruction word with only 35 single-word instructions, allowing most instructions to execute in one instruction cycle. This architectural simplicity enables embedded engineers to develop deterministic real-time control firmware without complex operating systems.
Key features include 8192 ROM words (14K x 14) of OTP program memory, 368 bytes of data RAM, and 33 digital I/O pins distributed across multiple ports. The device operates from 2.5V to 5.5V VDD (low-power LC variant), supports DC to 4 MHz clock input, and includes integrated peripherals such as timers, a synchronous serial port (SSP) compatible with SPI and I2C, a USART, an 8-bit ADC, and capture/compare/PWM modules. The "LC" family uses CMOS process technology with low quiescent current, making the part suitable for battery-powered applications where standby power matters.
Typical applications include industrial process control, instrumentation, automotive body electronics, low-power sensor nodes, and legacy embedded systems requiring 8-bit deterministic control. The wide operating voltage (2.5V-5.5V) and 33 I/O pins provide flexibility for both sensor interfacing and actuator driving.
When designing with this device, ensure that OTP memory programming is performed before final PCB assembly (OTP cannot be erased after programming). For in-circuit reprogrammability, consider the PIC16F67 flash-based variant in the same pin-compatible package.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16LC67T-04/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 PIC16LC67T-04/PQ (same form factor and footprint) — differing in ADC, Communication Peripherals, Core Architecture, MSL Level, Mounting Type.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC67T-04I/PQ
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →PIC16LC67T-04/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC67-04/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC67-04I/PQ
✅ Drop-In✓ In Stock
$7.05 / Unit
View Datasheet →PIC16LC67T-20/PQ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
PIC16LC67T-04/PQ Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC16C (8-bit RISC, Harvard) |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 14 KB (8K x 14 words) |
| Data RAM | 368 bytes |
| Maximum Clock Frequency | 4 MHz |
| Operating Voltage (VDD) | 2.5 V to 5.5 V |
| Number of I/O Pins | 33 |
| Package | 44-pin MQFP (PQ) |
| Mounting Type | Surface Mount (Gull-Wing) |
| Temperature Grade | Commercial (0C to +70C) |
| Instruction Set | 35 single-word instructions |
| Instruction Cycle | 1 cycle (4 cycles for branches) |
| ADC | 8-bit integrated |
| Communication Peripherals | SSP/SPI/I2C, USART |
| Process Technology | CMOS (low-power LC variant) |
| MSL Level | 3 (168 hours) |
PIC16LC67T-04/PQ Pin Configuration
| Pin 1 | RA0/AN0 — PORTA bit 0 / ADC input 0 |
| Pin 2 | RA1/AN1 — PORTA bit 1 / ADC input 1 |
| Pin 3 | RA2/AN2 — PORTA bit 2 / ADC input 2 |
| Pin 4 | RA3/AN3/VREF+ — PORTA bit 3 / ADC input 3 / VREF+ |
| Pin 5 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 6 | RA5/AN4/SS — PORTA bit 5 / ADC input 4 / SSP slave select |
| Pin 7 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Pin 8 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Pin 9 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Pin 10 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 11 | RC2/CCP1 — PORTC bit 2 / CCP1 |
| Pin 12 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 13 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 14 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 15 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Pin 16 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 17 | GND — Ground reference |
| Pin 18 | RD0/PSP0 — PORTD bit 0 / Parallel slave port bit 0 |
| Pin 19 | RD1/PSP1 — PORTD bit 1 / Parallel slave port bit 1 |
| Pin 20 | RD2/PSP2 — PORTD bit 2 / Parallel slave port bit 2 |
| Pin 21 | RD3/PSP3 — PORTD bit 3 / Parallel slave port bit 3 |
| Pin 22 | RD4/PSP4 — PORTD bit 4 / Parallel slave port bit 4 |
| Pin 23 | RD5/PSP5 — PORTD bit 5 / Parallel slave port bit 5 |
| Pin 24 | RD6/PSP6 — PORTD bit 6 / Parallel slave port bit 6 |
| Pin 25 | RD7/PSP7 — PORTD bit 7 / Parallel slave port bit 7 |
| Pin 26 | VSS — Ground reference |
| Pin 27 | VDD — Positive supply voltage (2.5V-5.5V) |
| Pin 28 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 29 | RB1 — PORTB bit 1 |
| Pin 30 | RB2 — PORTB bit 2 |
| Pin 31 | RB3 — PORTB bit 3 |
| Pin 32 | RB4 — PORTB bit 4 |
| Pin 33 | RB5 — PORTB bit 5 |
| Pin 34 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 35 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 36 | RE0/RD/AN5 — PORTE bit 0 / Read control / ADC input 5 |
| Pin 37 | RE1/WR/AN6 — PORTE bit 1 / Write control / ADC input 6 |
| Pin 38 | RE2/CS/AN7 — PORTE bit 2 / Chip select / ADC input 7 |
| Pin 39 | VDD — Positive supply voltage (2.5V-5.5V) |
| Pin 40 | VSS — Ground reference |
| Pin 41 | NC — Not connected |
| Pin 42 | NC — Not connected |
| Pin 43 | NC — Not connected |
| Pin 44 | MCLR/VPP — Master clear reset / Programming voltage |
Typical Applications
PIC16LC67T-04/PQ is suitable for 6 applications: Industrial Process Control, Low-Power Sensor Nodes, Automotive Body Electronics, Instrumentation and Test Equipment, Legacy Embedded Control Systems, HVAC and Building Automation.
Industrial Process Control
The PIC16LC67T-04/PQ fits industrial process control with 33 I/O pins supporting sensor multiplexing and actuator driving, 4 MHz CPU delivering 1 MIPS for PID loop execution, and 2.5V-5.5V VDD range compatible with 3.3V and 5V industrial backplanes. Its integrated 8-bit ADC samples process variables such as temperature, pressure, and flow rate with adequate resolution for closed-loop control. Unlike newer Cortex-M parts, the 8-bit RISC architecture provides deterministic interrupt latency essential for time-critical control loops without RTOS overhead. The 368-byte RAM buffers control variables and stack frames during interrupts. The MQFP-44 package supports reflow soldering for high-volume assembly.
Recommended
Low-Power Sensor Nodes
The PIC16LC67T-04/PQ suits battery-powered sensor nodes where the LC low-power CMOS process minimizes quiescent current draw. Operating from 2.5V to 5.5V VDD allows direct connection to single-cell lithium or two-AA battery stacks. The 4 MHz clock can be dynamically slowed or stopped via sleep mode to extend battery life, with the integrated ADC performing periodic sensor measurements under interrupt control. The 14 KB OTP program memory stores sensor calibration coefficients and wake-up logic. Compared to flash MCUs, the OTP variant reduces per-unit cost in high-volume disposable sensor applications.
Recommended
Automotive Body Electronics
The PIC16LC67T-04/PQ addresses automotive body electronics applications such as seat controllers, mirror adjusters, and HVAC flap motors where 8-bit deterministic control is sufficient. The 33 I/O pins drive relays, H-bridges, and switch matrices, while the USART peripheral interfaces with body control modules over LIN or serial protocols. For under-hood or high-temperature zones, choose the PIC16LC67T-04I/PQ industrial grade (-40C to +85C). This part predates AEC-Q100 qualification requirements; new automotive designs should select AEC-Q100-qualified alternatives like PIC16F1939 or dsPIC33 variants.
Recommended
Instrumentation and Test Equipment
The PIC16LC67T-04/PQ fits benchtop instrumentation such as digital multimeters, signal generators, and lab data loggers where 8-bit performance and integrated peripherals simplify BOM. The integrated USART streams measurement data to PCs at standard baud rates, while the SSP peripheral drives SPI LCD displays or EEPROM storage. The 8-bit ADC with multiple channels reads voltage, current, and temperature sensors for measurement front-ends. The 14 KB OTP stores calibration constants and menu logic in production firmware. The MQFP-44 footprint provides stable mechanical mounting in vibration-prone lab environments.
Recommended
Legacy Embedded Control Systems
The PIC16LC67T-04/PQ is widely used in legacy embedded control systems for industrial machinery, building automation, and medical devices where field replacement and long-term support require bit-identical firmware compatibility. The OTP memory ensures firmware cannot be corrupted by unauthorized reprogramming, a regulatory requirement in some medical and metrology applications. The deterministic RISC architecture with 35 single-word instructions enables code reviews and certification audits without complex RTOS analysis. Choose this part when maintaining production lines originally designed around PIC16C6X firmware.
Recommended
HVAC and Building Automation
The PIC16LC67T-04/PQ serves HVAC and building automation including thermostat controllers, fan speed regulators, and zone valve actuators. The 33 I/O pins interface with keypad inputs, LED indicators, relay outputs, and triac phase-control circuits for AC load dimming. The integrated timer modules generate PWM signals for variable-speed blower motors and proportional damper control. Operating from 2.5V-5.5V accommodates both 3.3V logic sensors and 5V relay drivers. The OTP memory locks in calibration and zone-setpoint firmware, preventing field tampering in commercial building installations.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC67T-04/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC67T-04I/PQ | PIC16LC67T-04/L | PIC16LC67-04/PQ | PIC16LC67-04I/PQ | PIC16LC67T-20/PQ |
|---|---|---|---|---|---|---|
| Package | 44-pin MQFP (PQ) | 44-pin MQFP (PQ) - same | 44-pin PLCC - different footprint | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same | 44-pin MQFP (PQ) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz (+400%) |
| Program Memory | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB OTP |
| Data RAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 368 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Commercial (0C to +70C) | Industrial (-40C to +85C) | Commercial (0C to +70C) | Commercial (0C to +70C) | Industrial (-40C to +85C) | Commercial (0C to +70C) |
| Operating Voltage | 2.5V to 5.5V | 2.5V to 5.5V | 2.5V to 5.5V | 2.5V to 5.5V | 2.5V to 5.5V | 2.5V to 5.5V |
Key Differentiators
- Industrial temperature grade option in same MQFP footprint (vs PIC16LC67T-04/PQ (commercial) vs PIC16LC67T-04I/PQ (industrial))
- PLCC variant for legacy through-hole repair (vs PIC16LC67T-04/PQ (MQFP) vs PIC16LC67T-04/L (PLCC))
- 5x faster clock option available (vs PIC16LC67T-04/PQ (4 MHz) vs PIC16LC67T-20/PQ (20 MHz))
Design Notes
The PIC16LC67T-04/PQ operates from 2.5V to 5.5V VDD. Decouple both VDD pins (27 and 39) with 100 nF ceramic capacitors placed within 5 mm of each pin to suppress switching noise from internal peripherals. Add a bulk 10 uF tantalum or aluminum capacitor at the board's power entry point. For battery-powered designs, use the LC variant's low-power sleep mode with oscillator halted to achieve standby currents below 1 uA.
Place the 4 MHz crystal or ceramic resonator within 10 mm of pins 7 (OSC1) and 8 (OSC2) to minimize parasitic capacitance. Add 1 M ohm parallel resistor across the crystal for reliable startup with low-drive crystals. Route the MCLR/VPP pin (pin 44) directly to a reset supervisor or pull-up resistor; do not leave floating, as noise on MCLR can cause spurious resets. Keep ICSP pins RB6/PGC and RB7/PGD accessible for in-circuit programming during prototyping.
The OTP program memory cannot be erased after programming - verify firmware thoroughly before final programming. For development cycles, use the PIC16F67 flash-based variant in the same MQFP-44 package to enable reprogramming. Configuration bits (fuses) must be set correctly for oscillator selection, watchdog timer, brown-out reset, and code protection - a misconfigured MCLR can lock the device. The LC variant requires supply voltage above 2.5V before oscillator starts; add a brown-out reset for low-voltage safety.
Compliance Information
RoHS and REACH compliance status not confirmed in verified web data - marked unknown. Part is NRND by Microchip. PIC16LC67T-04/PQ does not carry AEC-Q100 automotive qualification.
