PIC16LC65BT-04/L - 8-Bit 4MHz 7KB OTP MCU 44-PLCC | Microchip
MPN: PIC16LC65BT-04/L ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.85 | $7.85 |
| 10 | $7.2 | $72.00 |
| 100 | $6.55 | $655.00 |
| 500 | $5.95 | $2,975.00 |
| 1,000 | $5.4 | $5,400.00 |
PIC16LC65BT-04/L Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable peripheral interfaces. The PIC16C6x family belongs to Microchip's mid-range 8-bit PIC architecture, sitting below the enhanced PIC18 family and above the baseline PIC10/12/16 families. Mid-range PICs are commonly deployed in appliance controls, motor control, instrument clusters, and consumer embedded products where deterministic instruction execution and low BOM cost outweigh raw MIPS throughput.
Key features include 35 single-word instructions (200 ns per instruction at 20 MHz oscillator), 8K x 14 program memory address space (7 KB usable in OTP), 192-byte data RAM, eight 8-bit A/D converter channels, a synchronous serial port configurable as SPI or I2C, an enhanced USART with 9-bit address detect, and a watchdog timer with on-chip RC oscillator. The 44-pin PLCC variant exposes 33 I/O pins while the 40-pin variants (P, JW) trade I/O count for a smaller footprint. Power-on reset, brown-out detect, and power-saving sleep mode are standard. The /L suffix designates the PLCC J-Lead windowed CERDIP-style form factor for legacy through-hole or socketed applications.
Typical applications include HVAC thermostat control, vending machine controllers, security panel keypads, washing machine motor drivers, and industrial sensor interfaces where the PIC16C6x's deterministic timing and small footprint excel. The wide 2.5 V-5.5 V range enables direct battery or USB-powered designs. Pair with a 4 MHz resonator or crystal to drive the on-chip oscillator with PLL-like accuracy. Programming via ICSP allows in-circuit firmware updates with high-voltage (13.4 V) entry into the OTP memory.
When designing with this device, ensure the MCLR pin is pulled high through a 10-100 kohm resistor and decoupled with 100 nF of low-ESR ceramic capacitance. The oscillator configuration bits select HS, XT, LP, or RC modes; match the resonator to the chosen mode. Brown-out voltage is selectable between 4.0 V and 2.5 V via the BOR configuration bit; verify the chosen threshold above Vdd_min to avoid spurious resets.
Drop-in alternatives for PIC16LC65BT-04/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-04/L (same form factor and footprint) — differing in Program Memory Size, Program Memory Type, ADC, Communication Interfaces, Core Architecture.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC65BT-04I/L
✅ Drop-In✓ In Stock
$5.95 / Unit
View Datasheet →PIC16LC65BT-04/PQ
✅ Drop-In✓ In Stock
$5.04 / Unit
View Datasheet →PIC16LC65AT-04I/PT
✅ Drop-In✓ In Stock
$7.8 / Unit
View Datasheet →PIC16LC65A-04I/PQ
✅ Drop-In✓ In Stock
$5.3 / Unit
View Datasheet →PIC16LC65B-04/PQ
✅ Drop-In✓ In Stock
$2.5 / Unit
View Datasheet →PIC16LC65BT-04/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit mid-range RISC |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4 K x 14) |
| RAM Size | 192 x 8 B |
| Maximum Clock Speed | 4 MHz |
| Supply Voltage | 2.5 V to 5.5 V |
| I/O Ports | 33 |
| Timers | Timer0 (8-bit), Timer1 (16-bit), Timer2 (8-bit) |
| Communication Interfaces | USART, MSSP (SPI/I2C) |
| A/D Converter | 8 channels, 8-bit |
| Package Type | 44-pin PLCC (J-Lead, 16.59 x 16.59 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (industrial) |
| Instruction Set | 35 single-word instructions |
| Instruction Cycle Time | 200 ns at 20 MHz oscillator |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Brown-out Reset | Yes (configurable threshold) |
| In-Circuit Programming | ICSP via PGD/PGC pins |
PIC16LC65BT-04/L Pin Configuration
| Pin 1 | MCLR/Vpp |
| 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 / A/D reference |
| 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 | RE0/RD/AN5 — Port E bit 0 / Parallel slave port read / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — Port E bit 1 / Parallel slave port write / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — Port E bit 2 / Parallel slave port chip select / Analog input 7 |
| Pin 11 | Vdd — Positive supply voltage |
| Pin 12 | Vss — Ground reference |
| Pin 13 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 15 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP1 — Port C bit 1 / Timer1 oscillator input / Capture/Compare/PWM1 |
| Pin 17 | RC2/CCP2 — Port C bit 2 / Capture/Compare/PWM2 |
| Pin 18 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 — Port D bit 0 / Parallel slave port bit 0 |
| Pin 20 | RD1/PSP1 — Port D bit 1 / Parallel slave port bit 1 |
| Pin 21 | RD2/PSP2 — Port D bit 2 / Parallel slave port bit 2 |
| Pin 22 | RD3/PSP3 — Port D bit 3 / Parallel slave port bit 3 |
| Pin 23 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — Port C bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — Port C bit 6 / USART transmit / USART clock |
| Pin 26 | RC7/RX/DT — Port C bit 7 / USART receive / USART data |
| Pin 27 | RD4/PSP4 — Port D bit 4 / Parallel slave port bit 4 |
| Pin 28 | RD5/PSP5 — Port D bit 5 / Parallel slave port bit 5 |
| Pin 29 | RD6/PSP6 — Port D bit 6 / Parallel slave port bit 6 |
| Pin 30 | RD7/PSP7 — Port D bit 7 / Parallel slave port bit 7 |
| Pin 31 | Vss — Ground reference |
| Pin 32 | Vdd — Positive supply voltage |
| Pin 33 | RB0/INT — Port B bit 0 / External interrupt |
| Pin 34 | RB1 — Port B bit 1 |
| Pin 35 | RB2 — Port B bit 2 |
| Pin 36 | RB3/PGM — Port B bit 3 / Low-voltage programming enable |
| Pin 37 | RB4 — Port B bit 4 |
| Pin 38 | RB5 — Port B bit 5 |
| Pin 39 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — Port B bit 7 / ICSP data |
| Pin 41 | Vss — Ground reference |
| Pin 42 | Vdd — Positive supply voltage |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16LC65BT-04/L is suitable for 6 applications: HVAC Thermostat Control, Vending Machine Controller, Security Alarm Keypad, Washing Machine Motor Driver, Industrial Sensor Interface Hub, Consumer Appliance UI Controller.
HVAC Thermostat Control
The PIC16LC65BT-04/L fits HVAC thermostat designs where 33 I/O lines drive keypad scanning, LCD backlight control, and relay triac firing for heat/cool stages. The 8-channel 8-bit A/D reads thermistor dividers with 1 degree C resolution across the 0-50 C comfort range. The 16-bit Timer1 captures zero-cross events from a 24 VAC rectified rail with 1 us resolution, enabling phase-angle TRIAC control of inductive loads. The 2.5 V-5.5 V supply range accepts the rectified 24 VAC bus directly through a simple linear regulator.
Recommended
Vending Machine Controller
The PIC16LC65BT-04/L serves as the vending machine MPU controlling bill/coin validators, multi-drop MDB peripherals, and 7-segment dispense counters. The USART runs MDB protocol at 9600 baud with 9-bit address detect, while the MSSP SPI drives the front-panel LED matrix. The 7 KB OTP holds the price table, dispense logic, and audit-trail logging routines; the 192-byte RAM caches the current transaction state. Brown-out reset protects credit memory across power glitches, and the watchdog timer recovers from firmware lock-ups in unattended field deployments.
Recommended
Security Alarm Keypad
The PIC16LC65BT-04/L powers PIR-driven alarm panels with 33 I/O pins allocated to 16-key matrix scanning, eight zone inputs, and four siren/relay outputs. The MSSP I2C master drives an EEPROM for event-log storage and an RTC for timestamp accuracy. The wide 2.5 V-5.5 V supply accepts a 12 V SLA battery through an LDO, and the 200 ns instruction cycle executes 5000-line keypad-debounce routines in under 1 ms. Brown-out reset and watchdog timer combination ensures the panel recovers cleanly from AC power sags.
Recommended
Washing Machine Motor Driver
The PIC16LC65BT-04/L drives universal motor phase-control circuits in washing machines via the capture/compare/PWM module at 20 kHz switching frequency. The 8-channel A/D monitors motor current via shunt amplifiers and NTC water temperature sensors simultaneously. The USART interfaces an inverter display board reporting cycle status; the MSSP SPI runs the user-interface LED ring. With 33 I/O lines, the MCU can drive triac-controlled inlet valves, drain pump, door lock, and buzzer all from a single chip, eliminating external I/O expanders.
Recommended
Industrial Sensor Interface Hub
The PIC16LC65BT-04/L aggregates 4-20 mA loop transmitters, RTD probes, and digital sensors in industrial process control cabinets. The 8-channel 8-bit A/D reads each loop with 0.5 percent FS accuracy, while the MSSP SPI chain-scans up to 8 external A/D converters for higher-resolution channels. The USART streams linearized, calibrated data to a PLC master via Modbus RTU at 19200 baud. The 2.5 V-5.5 V supply supports 24 V industrial rails through simple buck regulation, and the watchdog timer prevents field lock-ups across EMC-disturbed environments.
Recommended
Consumer Appliance UI Controller
The PIC16LC65BT-04/L powers microwave oven, rice cooker, and air purifier user-interface boards with 33 I/O lines allocated to 4x4 keypads, 7-segment plus icon LCDs, and buzzer control. The capture/compare/PWM generates variable-tone alerts and triac-driven heating element switching. The ICSP interface enables factory-line firmware customization per region. The 192-byte RAM caches the user setting state during interrupts, and the brown-out reset preserves the running program through momentary mains dropouts typical of consumer-grade power supplies.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC65BT-04/L — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC65BT-04I/L | PIC16LC65BT-04/PQ | PIC16LC65AT-04I/PT | PIC16LC65A-04I/PQ | PIC16LC65B-04/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PQFP (J-Lead) | 44-PLCC (J-Lead) - same | 44-PQFP (J-Lead) | 44-PQFP (J-Lead) |
| Core / Architecture | 8-bit PIC mid-range RISC | 8-bit PIC mid-range RISC | 8-bit PIC mid-range RISC | 8-bit PIC mid-range RISC | 8-bit PIC mid-range RISC | 8-bit PIC mid-range RISC |
| Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP |
| RAM Size | 192 x 8 B | 192 x 8 B | 192 x 8 B | 192 x 8 B | 192 x 8 B | 192 x 8 B |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| 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 | 2.5 V to 5.5 V |
| Operating Temperature | -40C to +85C | -40C to +125C (extended industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Temperature Grade | Commercial (C) | Industrial (I) | Commercial (C) | Industrial (I) | Industrial (I) | Commercial (C) |
Key Differentiators
- 44-pin PLCC J-lead socket-compatible package (vs PIC16LC65BT-04/PQ)
- Commercial temperature grade -40C to +85C (vs PIC16LC65BT-04I/L)
- 33 I/O pins in mid-range 8-bit PIC architecture (vs PIC16C63 (28-pin))
Design Notes
Decouple both Vdd pins (12 and 32) with 100 nF X7R ceramic capacitors placed within 5 mm of each pin; add a single 10 uF tantalum or aluminum polymer bulk capacitor near the IC. The PIC16LC65BT-04/L draws approximately 2 mA at 4 MHz active and 1 uA in sleep mode per the datasheet. Place the bulk capacitor where the analog and digital Vdd planes join to suppress ground bounce on motor-control drive edges.
Always configure the BOR (brown-out reset) threshold above the application's minimum Vdd to prevent firmware lock-ups at low battery. Per the datasheet configuration bits, the BOREN bit enables the brown-out circuit with thresholds of 4.0 V, 2.7 V, or 2.5 V selectable via BORV. Programming the OTP without correct configuration-word values can brick the device, requiring factory-grade ICSP recovery.
Route the 4 MHz crystal traces symmetrically with the load capacitors (typical 15-33 pF) placed adjacent to the OSC1 and OSC2 pins. Keep crystal traces short and shielded from switching nodes; for SMT boards use a guard ring tied to ground. The /L PLCC J-lead package requires through-hole socket footprints for socketed programming or field replacement; reserve PCB area for an optional 44-pin PLCC socket on production boards to ease firmware updates.
Compliance Information
RoHS, REACH, lead-free, and halogen-free compliance status not stated in retrieved web data; conflict-minerals compliance inferred from Microchip Technology's published statement. AEC-Q100 not applicable for consumer/industrial MCU. /L commercial-temperature part is not automotive qualified; PIC16LC65BT-04I/L is the industrial-grade sibling.
