PIC16LC65BT-04I/PQ - 8-Bit 7KB MCU 44-MQFP | Microchip
MPN: PIC16LC65BT-04I/PQ ✓ Active| 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 |
PIC16LC65BT-04I/PQ Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory, working RAM, and peripheral interfaces. Within the broader semiconductor hierarchy, MCUs sit under microcontrollers -> embedded processors -> computing ICs -> integrated circuits. PIC16-series MCUs use Microchip's enhanced mid-range RISC architecture, providing deterministic instruction execution ideal for real-time control loops where predictable timing matters more than raw clock speed.
Key features include a hardware USART with addressable SPI and I2C (MSSP-style) serial peripherals, a 5-channel 8-bit ADC, programmable code protection, and an industrial temperature rating of -40 °C to +85 °C. The OTP program memory is factory- or device-programmable for volume production, while the 192-byte SRAM supports modest data-table and stack operations typical of mid-range 8-bit control firmware.
Typical applications include industrial automation controllers, consumer-electronics user-interface boards, automotive body and HVAC sub-systems, appliance motor control, and low-bandwidth sensor-hub nodes. The wide 2.5 V–5.5 V input range makes the part tolerant of unregulated battery or USB-derived rails.
When designing with this device, allocate the 33 I/O pins carefully against the analog and digital requirements, and respect the 4 MHz oscillator ceiling at 5 V. For code-protection requirements, evaluate Windowed (CERDIP) or QFP variants against your programming strategy. This page synthesizes distributor availability, drop-in alternatives, and practical design notes not collected on the manufacturer datasheet.
Drop-in alternatives for PIC16LC65BT-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 PIC16LC65BT-04I/PQ (same form factor and footprint) — differing in Program Memory Type, ADC, Communication Interfaces, Package, Instruction Set.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC65B-04I/PQ
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC65B-04/PQ
✅ Drop-In✓ In Stock
$2.5 / Unit
View Datasheet →PIC16LC65A-04I/PQ
✅ Drop-In✓ In Stock
$5.3 / Unit
View Datasheet →PIC16LC65A-04I/P
✅ Drop-In✓ In Stock
$4.65 / Unit
View Datasheet →PIC16LC65A-04/PQ
✅ Drop-In✓ In Stock
$6.5 / Unit
View Datasheet →PIC16LC65AT-04I/PT
✅ Drop-In✓ In Stock
$7.8 / Unit
View Datasheet →PIC16LC65BT-04I/PQ Maximum Ratings & Electrical Characteristics
| Product Type | 8-Bit Microcontroller (MCU) |
| Series | PIC16CXX mid-range (PIC16C63A/65B/73B/74B family) |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 bytes |
| CPU Speed | 4 MHz |
| Supply Voltage Range | 2.5 V to 5.5 V |
| I/O Pins | 33 |
| ADC | 8-bit, multi-channel (integrated) |
| Timers | Timer0 (8-bit), Timer1 (16-bit, sleep-increment), Timer2 (8-bit) |
| Communication Interfaces | USART, SPI, I2C |
| Package | 44-MQFP (10x10 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40 °C to +85 °C (Industrial) |
| Lifecycle Stage | ACTIVE |
PIC16LC65BT-04I/PQ Pin Configuration
| Pin 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| 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 |
| Pin 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / ADC reference |
| 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 |
| Pin 9 | OSC2/CLKOUT — Oscillator output / Clock out |
| Pin 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / clock in |
| Pin 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Pin 12 | RC2/CCP1 — PORTC bit 2 / Capture-Compare-PWM1 |
| 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 / clock |
| Pin 17 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pin 18 | VSS — Ground reference |
| Pin 19 | VDD — Positive supply (2.5 V - 5.5 V) |
| Pin 20 | VSS — Ground reference |
| Pin 21 | VDD — Positive supply (2.5 V - 5.5 V) |
| Pin 22 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 23 | RB1 — PORTB bit 1 |
| Pin 24 | RB2 — PORTB bit 2 |
| Pin 25 | RB3 — PORTB bit 3 |
| Pin 26 | RB4 — PORTB bit 4 |
| Pin 27 | RB5 — PORTB bit 5 |
| Pin 28 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 29 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 30 | VSS — Ground reference |
| Pin 31 | VDD — Positive supply (2.5 V - 5.5 V) |
| Pin 32 | RD0 — PORTD bit 0 |
| Pin 33 | RD1 — PORTD bit 1 |
| Pin 34 | RD2 — PORTD bit 2 |
| Pin 35 | RD3 — PORTD bit 3 |
| Pin 36 | RD4 — PORTD bit 4 |
| Pin 37 | RD5 — PORTD bit 5 |
| Pin 38 | RD6 — PORTD bit 6 |
| Pin 39 | RD7 — PORTD bit 7 |
| Pin 40 | VSS — Ground reference |
| Pin 41 | VDD — Positive supply (2.5 V - 5.5 V) |
| Pin 42 | RE0/RD — PORTE bit 0 / Parallel slave port read |
| Pin 43 | RE1/WR — PORTE bit 1 / Parallel slave port write |
| Pin 44 | RE2/CS — PORTE bit 2 / Parallel slave port chip select |
Typical Applications
PIC16LC65BT-04I/PQ is suitable for 6 applications: Industrial Automation Controllers, Consumer Electronics User Interface Boards, Automotive Body and HVAC Sub-Systems, Appliance Motor Control (BLDC/PWM), Low-Bandwidth Sensor Hub Nodes, Battery-Powered Measurement Instruments.
Industrial Automation Controllers
The PIC16LC65BT-04I/PQ fits industrial automation controllers because of its 33 I/O pins, 4 MHz CPU, and -40 °C to +85 °C industrial temperature rating. The wide 2.5 V–5.5 V supply tolerates unregulated 24 V->5 V rails common on factory PLC backplanes, while the integrated 8-bit ADC handles analog sensor inputs (temperature, pressure, flow) directly without an external converter. Compared with flash PICs, the OTP variant is favored when firmware is locked at MP launch and production volumes exceed 10K units, since OTP die cost is 30–50% lower. The PIC's deterministic RISC pipeline delivers consistent interrupt latency required by real-time PID loops driving conveyor motors, valve actuators, and relay sequencing.
Recommended
Consumer Electronics User Interface Boards
The PIC16LC65BT-04I/PQ is well matched to consumer-electronics user-interface boards, including washing-machine control panels, microwave keypads, and HVAC thermostats. Its 33 I/Os can drive 7-segment displays, multiplexed key matrices, and rotary encoders simultaneously without external I/O expanders. The 192-byte RAM is ample for menu state machines, while the 7 KB OTP holds firmware for icons, beep patterns, and sensor-conditioning logic. Unlike flash MCUs, the OTP device prevents end-user firmware tampering and reduces BOM cost in high-volume SKUs, which is critical when consumer price-points drive design economics.
Recommended
Automotive Body and HVAC Sub-Systems
The PIC16LC65BT-04I/PQ supports automotive body and HVAC sub-systems such as seat controllers, mirror adjusters, and climate-control modules, where its -40 °C to +85 °C industrial window covers most cabin-temperature use cases. The integrated SPI and I2C peripherals talk to dashboard sensors and actuator drivers, while the hardware USART enables LIN-bus-like slave communication via a LIN transceiver. Its 4 MHz core easily handles debounced switch scanning, PWM-driven blower motors, and lookup-table-based temperature compensation. The 44-MQFP package provides a robust surface-mount footprint suited to vibration-prone automotive PCB environments.
Recommended
Appliance Motor Control (BLDC/PWM)
The PIC16LC65BT-04I/PQ can drive appliance motor-control sub-circuits including PWM controllers for fans, pumps, and small universal motors in washing machines and dishwashers. Its Timer2 module generates accurate PWM with a programmable period, while the 8-bit ADC samples motor current and back-EMF for closed-loop speed control. The 33 I/Os are sufficient for H-bridge gate drivers, tachometer inputs, and safety interlocks. The 2.5–5.5 V supply allows direct connection to rectified mains-derived rails through low-cost regulators, simplifying the analog supply chain in cost-sensitive appliances.
Recommended
Low-Bandwidth Sensor Hub Nodes
The PIC16LC65BT-04I/PQ suits low-bandwidth sensor-hub nodes that aggregate temperature, humidity, and contact-closure data in building-automation and asset-tracking deployments. Its hardware I2C and SPI ports allow direct attachment of digital temperature sensors (e.g., MCP9808), accelerometers, and EEPROM, while the USART links to RS-485 transceivers for multi-drop fieldbus wiring. The 7 KB OTP holds Modbus RTU frame builders, sensor-calibration tables, and CRC routines. The 192-byte RAM and deterministic mid-range pipeline let the device poll up to a dozen sensors at sub-second intervals without missing scheduled control cycles.
Recommended
Battery-Powered Measurement Instruments
The PIC16LC65BT-04I/PQ can anchor battery-powered measurement instruments such as handheld multimeters, IR thermometers, and portable gas detectors, thanks to its low 2.5 V minimum supply that allows 2xAA or 2xAAA alkaline cells to power the system directly. The integrated 8-bit ADC with 5+ channels reads sensor bridges, while Timer1's sleep-increment capability enables low-power RTC-style timing without an external RTC chip. The 33 I/Os drive LCD segments, button matrices, and buzzer drivers. OTP memory protects proprietary calibration constants from being read back electrically, an important consideration for calibration-locked test instruments.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC65BT-04I/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC65B-04I/PQ | PIC16LC65A-04I/PQ | PIC16LC65AT-04I/PT |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (10x10) | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same | 44-MQFP (10x10) - same |
| Program Memory | 7 KB (4K x 14) OTP | 7 KB (4K x 14) OTP | 7 KB (4K x 14) OTP | 7 KB (4K x 14) OTP |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| I/O Pins | 33 | 33 | 33 | 33 |
| CPU Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage | 2.5 V - 5.5 V | 2.5 V - 5.5 V | 2.5 V - 5.5 V | 2.5 V - 5.5 V |
| Operating Temperature | -40 °C to +85 °C (Industrial) | -40 °C to +85 °C | -40 °C to +85 °C | -40 °C to +85 °C |
Key Differentiators
- Industrial-temperature OTP MCU with 33 I/Os in 44-MQFP (vs PIC16LC65B-04/PQ)
- Tape-and-reel packaging revision for SMT production (vs PIC16LC65B-04I/PQ)
- Latest silicon revision vs older A-revision (vs PIC16LC65A-04I/PQ)
Design Notes
OTP program memory cannot be erased electrically - once a PIC16LC65BT-04I/PQ is programmed, the firmware is permanent. For prototype and pre-production builds, use a Windowed (CERDIP) variant (PIC16LC65BT-04I/JW) or a flash-based PIC from the same pinout family to allow code iteration. Only commit to OTP volume orders after firmware is fully validated, since a single OTP die with a firmware bug results in scrap, not rework.
Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pair of the PIC16LC65BT-04I/PQ (the 44-MQFP exposes 4 VDD and 4 VSS pins). Add a bulk 10 µF tantalum or ceramic near the package to suppress board-level noise during ADC conversions. Keep the MCLR/VPP trace short and route it away from the OSC1/OSC2 crystal traces to avoid false resets during high-current switching events on adjacent I/Os.
The PIC16LC65BT-04I/PQ draws significantly more current at 5 V than at 3.3 V when peripherals are active. For battery-powered designs, run the core at 3.3 V and gate peripheral power through a P-MOSFET controlled by an unused I/O pin. The brown-out reset (BOR) is enabled by configuration fuse - leave it enabled in industrial designs to ensure deterministic restart on supply droop below ~4 V at 5 V operation.
Compliance Information
RoHS and REACH compliant per Microchip product page. AEC-Q100 not applicable for PIC16LC65 family (industrial grade, not automotive-qualified).
