PIC16LC67T-04I/PQ - 14KB OTP 8-bit MCU, 4MHz, 44-MQFP | Microchip
MPN: PIC16LC67T-04I/PQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.01 | $3.01 |
| 10 | $2.85 | $28.50 |
| 100 | $2.5 | $250.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.92 | $1,920.00 |
PIC16LC67T-04I/PQ Overview
What is a microcontroller? A microcontroller (MCU) is a single-chip computer integrating a CPU core, non-volatile program memory (here One-Time-Programmable EPROM), volatile data memory (RAM), peripherals, and I/O. The PIC16LC67 sits inside the PIC16C sub-family and shares the baseline PIC instruction set with PIC16C6X devices, putting it in the broader hierarchy of 8-bit microcontroller -> embedded controller -> integrated circuit. The architecture's hallmark is deterministic instruction timing and code density - one 14-bit instruction per clock cycle - which simplifies real-time firmware development versus accumulator-based 8-bit cores.
Key features include 33 digital I/O lines across five ports (PORTA-PORTE), three timer/counter modules (Timer0, Timer1, Timer2), a 5-channel 8-bit ADC, two PWM modules, and a Watchdog Timer with its own on-chip RC oscillator for reliable operation. Communication peripherals include USART/SCI, SPI, and I2C (Master/Slave) plus a Parallel Slave Port (PSP), making the device suitable for both sensor and host-bus interfacing. On-chip safety features include Brown-Out Detect (BOD), Power-On Reset (POR), and a programmable code-protection scheme that supports partial and full memory lock.
Typical applications include industrial control panels, smart instrumentation, sensor hubs with serial reporting, low-power battery-powered metering, and white-goods motor control where the ADC plus PWM combination eliminates external analog/driver ICs. The MQFP-44 footprint gives the same generous ground/power pinout that has been standard across PIC16C6X since the late 1990s, easing PCB reuse for designers migrating between PIC16C6X variants.
Designers should treat the OTP memory as truly one-time - any firmware update requires a new device - and budget at least 1 uF of decoupling on VDD with a 0.1 uF ceramic placed within 5 mm of the package. The clock input requires careful routing to avoid coupling noise into the ADC analog channel. This page consolidates distributor pricing, drop-in alternatives, and design considerations not available on the manufacturer landing page.
Drop-in alternatives for PIC16LC67T-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 PIC16LC67T-04I/PQ (same form factor and footprint) — differing in Program Memory Size, Package, ADC, Program Memory Type, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC67-04I/PQ
✅ Drop-In✓ In Stock
$7.05 / Unit
View Datasheet →PIC16LC65BT-04I/PQ
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →PIC16LC65B-04/PQ
✅ Drop-In✓ In Stock
$2.5 / Unit
View Datasheet →PIC16LC65A-04I/PQ
✅ Drop-In✓ In Stock
$5.3 / Unit
View Datasheet →PIC16LC67T-04I/PQ Maximum Ratings & Electrical Characteristics
| Product Family | PIC16C6X (PIC16LC67) |
| Core Architecture | 8-bit RISC PIC |
| Program Memory Size | 14 KB (8K x 14) OTP/EPROM |
| RAM Size | 368 bytes |
| Maximum Clock Frequency | 4 MHz |
| Instruction Set | 35 single-word instructions |
| Supply Voltage Range | 3.0 V to 6.0 V |
| Number of I/O Pins | 33 |
| Number of Timers | 3 |
| PWM Modules | 2 |
| ADC | 5 channels x 8-bit |
| Communication Peripherals | USART, SPI, I2C, PSP |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Package | 44-pin MQFP (10x10 mm), Tape & Reel |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
PIC16LC67T-04I/PQ Pin Configuration
| Pin 1 | MCLR — Master Clear (Reset) input, active low |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 / VREF- |
| Pin 5 | RA3/AN3/VREF+ — PORTA bit 3 / Analog input 3 / VREF+ |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 9 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / clock input |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 PWM output |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / CCP1 PWM output |
| Pin 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 16 | RC6/TX/CK — PORTC bit 6 / USART TX / USART clock |
| Pin 17 | RC7/RX/DT — PORTC bit 7 / USART RX / USART data |
| Pin 18 | VSS — Ground |
| Pin 19 | VDD — Positive supply voltage (3.0V to 6.0V) |
| Pin 20 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 21 | RB1 — PORTB bit 1 |
| Pin 22 | RB2 — PORTB bit 2 |
| Pin 23 | RB3/PGM — PORTB bit 3 / Low-voltage programming |
| Pin 24 | RB4 — PORTB bit 4 |
| Pin 25 | RB5 — PORTB bit 5 |
| Pin 26 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 27 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 28 | VSS — Ground |
| Pin 29 | VDD — Positive supply voltage |
| Pin 30 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pin 31 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pin 32 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pin 33 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Pin 34 | RD4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pin 35 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pin 36 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pin 37 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pin 38 | RE0/RD — PORTE bit 0 / Parallel Slave Port read strobe |
| Pin 39 | RE1/WR — PORTE bit 1 / Parallel Slave Port write strobe |
| Pin 40 | RE2/CS — PORTE bit 2 / Parallel Slave Port chip select |
| Pin 41 | VSS — Ground |
| Pin 42 | VDD — Positive supply voltage |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16LC67T-04I/PQ is suitable for 6 applications: Industrial Control Panels, Smart Sensor Hubs, Battery-Powered Metering, White-Goods Motor Control, Serial-Reporting Data Loggers, Human-Machine Interface Boards.
Industrial Control Panels
The PIC16LC67T-04I/PQ's 33 I/O pins and 5-channel 8-bit ADC make it well suited for industrial control-panel front-ends that read multiple potentiometers, panel buttons, and discrete sensors while driving relays and indicator LEDs. The 14 KB OTP holds full state-machine plus Modbus-RTU protocol stacks for a panel-mounted HMI. Wide-voltage 3.0V to 6.0V operation tolerates unregulated 24V-derived rails after a buck stage, and the -40 C to +85 C industrial range supports factory-floor enclosures. The 44-MQFP footprint keeps the design in an industry-standard package with broad second-source alternatives like PIC16LC67-04I/PQ.
Recommended
Smart Sensor Hubs
The PIC16LC67T-04I/PQ integrates ADC, I2C, SPI, and USART peripherals, allowing one device to aggregate data from multiple sensor front-ends (temperature, pressure, flow) over I2C/SPI and report over a UART link to a host controller. Its 14 KB OTP holds custom calibration tables and a lightweight RTOS-style scheduler, while 368 bytes of RAM is enough for buffering a few sensor frames. The 4 MHz clock provides adequate throughput for polling loops in the 100 Hz range typical of environmental monitoring. Power consumption in the low-MA range at 3.3V suits battery-backed sensor nodes.
Recommended
Battery-Powered Metering
Battery-powered metering benefits from the PIC16LC67T-04I/PQ's low-power CMOS process and 3.0V minimum supply, which enables 2xAA alkaline operation with a switching boost converter. Brown-Out Detect reliably resets the device when cells deplete, protecting EEPROM-style user logs from corruption. The ADC and PWM channels drive a multiplexed LCD segment driver or a low-cost LED bargraph display. The 14 KB OTP fits a metrology algorithm plus LCD-segment rendering tables, and the Watchdog Timer plus on-chip RC oscillator keep the system alive during brown-out events.
Recommended
White-Goods Motor Control
Appliance motor control boards use the PIC16LC67T-04I/PQ's two PWM modules plus 5-channel ADC to drive a single BLDC or universal motor with closed-loop current and speed feedback. The 33 I/O lines interface Hall sensors, quadrature encoders, and discrete switches, while USART/SPI ports feed back telemetry to a higher-level appliance controller. Industrial -40 to +85 C operation covers refrigerator and washer environments, and the 44-MQFP provides good thermal dissipation at moderate PWM switching frequencies up to 25 kHz. The 14 KB OTP accommodates lookup tables for sinusoidal commutation.
Recommended
Serial-Reporting Data Loggers
Data loggers that periodically sample analog inputs and transmit over RS-232 or RS-485 benefit from the PIC16LC67T-04I/PQ's USART peripheral and 5-channel ADC. The 14 KB OTP holds a small file system driver for external I2C EEPROM or SPI flash, plus a Modbus-RTU frame parser. Brown-Out Detect and Watchdog Timer protect long unattended deployments, and the 3.0V to 6.0V range supports both 3.3V and 5V transceivers. Industrial temperature range allows outdoor or factory cabinet mounting.
Recommended
Human-Machine Interface Boards
HMI front-end boards with keypads, rotary encoders, and small character LCDs can be built around the PIC16LC67T-04I/PQ, using its 33 I/O to scan 4x4 key matrices and drive HD44780-style LCDs in 4-bit mode. The 14 KB OTP holds custom menu trees, while 368 bytes RAM is enough for key debounce buffers and active-screen state. The PSP (Parallel Slave Port) interfaces to a host CPU that renders graphics, offloading the scan/keyboard logic to the PIC. Wide 3.0-6.0V supply matches both 3.3V and 5V system rails.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC67T-04I/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC67-04I/PQ | PIC16LC65BT-04I/PQ | PIC16LC65B-04/PQ | PIC16LC65A-04I/PQ |
|---|---|---|---|---|---|
| Package | 44-MQFP (10x10 mm), T&R | 44-MQFP (10x10 mm), Tray | 44-MQFP (10x10 mm), T&R | 44-MQFP (10x10 mm), T&R | 44-MQFP (10x10 mm), T&R |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (KB OTP) | 14 KB | 14 KB | 7 KB | 7 KB | 7 KB |
| Maximum Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| I/O Pins | 33 | 33 | 33 | 33 | 33 |
| Operating Voltage | 3.0V to 6.0V | 3.0V to 6.0V | 3.0V to 6.0V | 3.0V to 6.0V | 3.0V to 6.0V |
| Temperature Grade | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Industrial -40 C to +85 C | Commercial 0 C to +70 C | Industrial -40 C to +85 C |
| Lifecycle Status | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete |
Key Differentiators
- Highest-density PIC16LC6X variant in MQFP-44 (vs PIC16LC65BT-04I/PQ)
- Industrial temperature grade with full memory (vs PIC16LC65B-04/PQ)
- Tape & Reel format for SMT high-volume (vs PIC16LC67-04I/PQ (Tray))
Design Notes
Place a 1 uF tantalum and a 0.1 uF ceramic decoupling capacitor as close as physically possible to each VDD/SS pin pair (pins 19/18, 29/28, 42/41). The PIC16LC67T-04I/PQ has three VDD pins distributed across the 44-MQFP package and each must be decoupled locally to prevent logic errors during high-current ADC or PWM switching events. Add a 10 uF bulk capacitor at the regulator output to handle transient loads during ADC conversions.
Route the analog inputs (RA0-RA5) away from digital switching traces, especially the PWM outputs on RC1/RC2. The 8-bit ADC does not include dedicated guard traces; physical separation is the primary isolation method. Keep the crystal/oscillator traces short and symmetric, surrounded by a ground pour on the same layer. MCLR should be pulled up to VDD through a 10 kohm resistor with a 100 nF cap to ground to allow in-circuit serial programming without spurious resets.
Because the PIC16LC67T-04I/PQ uses OTP EPROM, firmware bugs cannot be patched in-circuit - a new OTP window must be erased under UV light (for windowed variants) or a fresh part must be ordered (for OTP-only variants). Always validate firmware on a windowed PIC16C67 or a flash-based PIC16F877A equivalent before committing to OTP production. Additionally, code-protect bits cannot be reset on OTP parts without a full erase cycle, so set them only after final firmware verification.
Estimated: At VDD=5V, clock=4 MHz, and all 33 I/O lines sourcing 20 mA, the PIC16LC67T-04I/PQ dissipates roughly 100 mA * 5V + CMOS core current, yielding an estimated 0.6W junction dissipation. The 44-MQFP has theta_JA around 50 C/W on a 4-layer JEDEC test board, giving an estimated junction rise of 30 C above ambient - well within the 125 C max junction. Designers should still verify worst-case dissipation if all I/O lines are simultaneously sourcing full current.
Compliance Information
Lifecycle status: obsolete. RoHS/REACH compliance not confirmed for this mature OTP variant - Microchip legacy datasheets typically predate RoHS transition. AEC-Q100 not applicable for PIC16C6X family.
