PIC16LC65BT-04I/L - 8-bit MCU, 4MHz, 7KB OTP, 44-PLCC | Microchip
MPN: PIC16LC65BT-04I/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $9.85 | $9.85 |
| 10 | $8.95 | $89.50 |
| 100 | $7.95 | $795.00 |
| 500 | $6.85 | $3,425.00 |
| 1,000 | $5.95 | $5,950.00 |
PIC16LC65BT-04I/L Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, RAM, and peripherals. The PIC16CXX mid-range architecture is one of three PIC lineages (base-line, mid-range, enhanced mid-range) and provides a 14-bit instruction word, 8-bit data path, and a hardware stack that balances code density with deterministic interrupt latency. Mid-range PICs remain popular in industrial control, sensor interfaces, and brown-out-aware embedded designs.
Key features of the PIC16LC65BT-04I/L include three timer modules (Timer0 8-bit with prescaler, Timer1 16-bit with prescaler and external clock capability, Timer2 8-bit), a 5-channel 8-bit ADC, two PWM outputs, and an industrial operating temperature range of -40C to +85C. The -04 speed suffix designates a 4 MHz oscillator input, while the 'T' suffix indicates tape-and-reel packaging. The 'I' industrial temperature grade and 'L' package code (44-PLCC) are factory-burned identifiers per Microchip ordering nomenclature.
The architecture uses a Harvard design with separate program and data buses, allowing simultaneous instruction fetch and data access. The 14-bit instruction set delivers compact code density, while the single-cycle ALU architecture provides predictable timing for real-time control loops. Internal brown-out reset and power-on reset simplify external supervision circuits.
Typical applications include industrial automation controllers, sensor signal conditioning, motor drive interface boards, HVAC fan/valve controllers, and embedded human-machine interface panels. The PIC16CXX mid-range family is widely deployed in brown-out-sensitive industrial systems and in legacy designs where 5V tolerance and PIC instruction-set familiarity are required.
When designing with this device, ensure decoupling capacitors are placed close to VDD/VSS pins and that the oscillator layout follows Microchip AN588 guidelines. Industrial-grade parts require a clean analog supply for ADC accuracy, so route AVSS and AGND traces separately from noisy digital returns.
This page synthesizes distributor pricing, drop-in PLCC-44 alternatives, and practical design notes not found in the manufacturer datasheet alone, providing engineers with a single consolidated reference for sourcing and qualifying the PIC16LC65BT-04I/L in production.
Drop-in alternatives for PIC16LC65BT-04I/L — 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/L (same form factor and footprint) — differing in Program Memory Size, Program Memory Type, ADC, Communication Interfaces, RAM Size.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC65B-04I/L
✅ 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 →PIC16LC65AT-04I/PT
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$7.8 / Unit
View Datasheet →PIC16C65B-04/PQ
✅ Drop-In✓ In Stock
$10.25 / Unit
View Datasheet →PIC16LC65BT-04I/L Maximum Ratings & Electrical Characteristics
| Product Family | PIC 16C Mid-Range MCU |
| Core Architecture | 8-bit RISC (Harvard) |
| Instruction Set | 14-bit PIC mid-range |
| Program Memory Size | 7 KB (4K x 14) OTP |
| RAM Size | 192 x 8 bytes |
| Maximum Clock Frequency | 4 MHz (-04 speed grade) |
| Supply Voltage Range | 2.5 V to 5.5 V |
| I/O Pins | 33 |
| Communication Interfaces | I2C, SPI, USART |
| Timers | Timer0 (8-bit), Timer1 (16-bit), Timer2 (8-bit) |
| ADC | 8-bit, 5 channels |
| PWM Channels | 2 |
| Operating Temperature Range | -40 C to +85 C (Industrial) |
| Package Type | 44-pin PLCC (J-Lead) |
| Package Dimensions | 16.59 x 16.59 mm |
| Mounting Type | Surface Mount |
PIC16LC65BT-04I/L Pin Configuration
| Pin 1 | MCLR — Master Clear (reset) input |
| Pin 2 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF+ — Port A bit 3 / Analog input 3 / ADC VREF+ |
| Pin 6 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI Slave Select |
| Pin 8 | AVSS — Analog ground |
| Pin 9 | AVDD — Analog supply voltage |
| Pin 10 | OSC1/CLKIN — Oscillator input / external clock |
| Pin 11 | OSC2/CLKOUT — Oscillator output |
| Pin 12 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 13 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 PWM |
| Pin 14 | RC2/CCP1 — Port C bit 2 / CCP1 PWM output |
| Pin 15 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Pin 16 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Pin 17 | RC5/SDO — Port C bit 5 / SPI data out |
| Pin 18 | RC6/TX/CK — Port C bit 6 / USART TX / USART clock |
| Pin 19 | RC7/RX/DT — Port C bit 7 / USART RX / USART data |
| Pin 20 | VSS — Digital ground |
| Pin 21 | VDD — Digital supply voltage |
| Pin 22 | RB0/INT — Port B bit 0 / External interrupt |
| Pin 23 | RB1 — Port B bit 1 |
| Pin 24 | RB2 — Port B bit 2 |
| Pin 25 | RB3 — Port B bit 3 |
| Pin 26 | RB4 — Port B bit 4 |
| Pin 27 | RB5 — Port B bit 5 |
| Pin 28 | RB6 — Port B bit 6 |
| Pin 29 | RB7 — Port B bit 7 |
| Pin 30 | NC — Not connected |
| Pin 31 | NC — Not connected |
| Pin 32 | NC — Not connected |
| Pin 33 | NC — Not connected |
| Pin 34 | NC — Not connected |
| Pin 35 | NC — Not connected |
| Pin 36 | NC — Not connected |
| Pin 37 | NC — Not connected |
| Pin 38 | NC — Not connected |
| Pin 39 | NC — Not connected |
| Pin 40 | NC — Not connected |
| Pin 41 | RE0/RD — Port E bit 0 / Parallel slave port read |
| Pin 42 | RE1/WR — Port E bit 1 / Parallel slave port write |
| Pin 43 | RE2/CS — Port E bit 2 / Parallel slave port chip select |
| Pin 44 | VSS — Digital ground |
Typical Applications
PIC16LC65BT-04I/L is suitable for 6 applications: Industrial Automation Controllers, Sensor Signal Conditioning Hubs, HVAC Fan and Valve Controllers, Motor Drive Interface Boards, Embedded HMI Panels, Legacy Brown-Out Sensitive Systems.
Industrial Automation Controllers
The PIC16LC65BT-04I/L fits industrial automation controllers with its -40 C to +85 C industrial temperature range, 33 bidirectional I/O pins, and integrated USART. The 7 KB OTP memory is sufficient for PID loop sub-routines, sensor polling, and actuator control logic in PLC sub-modules. Its 2.5 V to 5.5 V supply supports both 24 V-derived 5 V and 3.3 V mixed-rail designs common on factory floors. Compared to a 16-bit MCU, the 8-bit PIC delivers deterministic interrupt latency critical for real-time control loops.
Recommended
Sensor Signal Conditioning Hubs
The PIC16LC65BT-04I/L serves as a sensor signal conditioning hub, leveraging its 5-channel 8-bit ADC and I2C/SPI interfaces to aggregate multiple analog and digital sensors. The PIC16C mid-range core's deterministic 1 MIPS performance at 4 MHz enables tight sampling loops for thermistor, strain-gauge, and pressure-sensor front-ends. The 192-byte RAM is adequate for moving-average filters and peak-detection buffers before UART transmission to a host controller.
Recommended
HVAC Fan and Valve Controllers
The PIC16LC65BT-04I/L is well-suited to HVAC fan and valve controllers where its industrial temperature rating, two PWM channels, and 5-channel ADC simplify closed-loop fan-speed and damper-position regulation. The 7 KB OTP accommodates look-up tables for non-linear damper curves and EEPROM-emulation storage for calibration constants. Brown-out reset and power-on reset integrated on-chip reduce external supervisory components, lowering BOM cost in high-volume HVAC OEM runs.
Recommended
Motor Drive Interface Boards
The PIC16LC65BT-04I/L operates as a motor drive interface board controller, using its USART for RS-485 communication with a central PLC and its PWM channels for speed-reference signals to gate drivers. The 33 I/O pins accommodate enable inputs, fault-flag outputs, and Hall-effect sensor feedback. The PIC mid-range architecture's deterministic timing simplifies encoder pulse-counting routines used in brushless DC motor commutation sequences.
Recommended
Embedded HMI Panels
The PIC16LC65BT-04I/L drives embedded HMI panel logic, including button-scan matrices, LED/PWM backlight control, and SPI-attached character LCD interfaces. With 33 I/O, the device can scan a 4x4 keypad, drive status LEDs, and communicate with a host display controller via USART. The 7 KB OTP holds finite-state-machine logic for menu navigation, while the 192-byte RAM supports keypad debounce buffers and display-refresh scratch space.
Recommended
Legacy Brown-Out Sensitive Systems
The PIC16LC65BT-04I/L is ideal for brown-out sensitive legacy systems that require reliable 5 V operation across industrial voltage fluctuations. Its on-chip brown-out reset and power-on reset eliminate external reset supervisors, simplifying PCB layout in space-constrained retrofits. The PIC16C mid-range core's deterministic interrupt latency and stable 5 V tolerance make it a drop-in replacement for aging PIC16C65 designs where software compatibility is mandatory.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC65BT-04I/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC65B-04I/L | PIC16LC65B-04/PQ | PIC16LC65A-04I/PQ | PIC16LC65AT-04I/PT | PIC16C65B-04/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC - same | 44-PLCC - same | 44-PLCC - same | 44-PLCC family - same | 44-PLCC - same |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 4.5 V to 5.5 V |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Temperature Grade | Industrial (-40 C to +85 C) | Industrial | Commercial | Industrial | Industrial | Commercial |
| Packaging Code | Tape & Reel (T) | Tray | Tray | Tray | Tape & Reel | Tray |
Key Differentiators
- OTP program memory supports field-programmable one-time-write code deployment (vs PIC16C65B-04/PQ)
- Industrial temperature grade for factory-floor deployment (vs PIC16LC65B-04/PQ)
- Surface-mount 44-PLCC J-Lead package compatible with standard PLCC sockets (vs PIC16LC65AT-04I/PT)
Design Notes
Place a 100 nF decoupling capacitor as close as possible to each VDD/VSS pair on the PIC16LC65BT-04I/L, plus a bulk 10 uF tantalum or ceramic at the package entry point. For analog references, decouple AVDD/AVSS separately with 100 nF and 10 uF to suppress ADC switching noise. The brown-out reset threshold is factory-trimmed but verify against worst-case 24 V industrial rails after PCB layout.
Route the 4 MHz oscillator traces (OSC1/OSC2) over a continuous ground plane and keep them shorter than 20 mm to minimize EMI and stray capacitance. Place crystal loading capacitors within 3 mm of the oscillator pins. Avoid routing digital switching signals parallel to OSC1/OSC2 to prevent injection of jitter into the system clock.
Do not exceed 5.5 V on VDD - although the LC variant supports 2.5 V to 5.5 V, momentary over-voltage during hot-plug events can latch the MCU. Always use the MCLR pin with a proper 10 kohm pull-up to VDD rather than leaving it floating; floating MCLR is a common cause of erratic brown-out behavior in field returns.
Compliance Information
ROHS, REACH, lead-free, and halogen-free status not provided in verified web data; AEC-Q100 not applicable for non-automotive MCU.
