PIC16LC65B-04/PQ - 8-Bit 4MHz OTP MCU 7KB 33 I/O | Microchip
MPN: PIC16LC65B-04/PQ ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.1 | $4.10 |
| 10 | $3.78 | $37.80 |
| 100 | $3.2 | $320.00 |
| 500 | $2.83 | $1,415.00 |
| 1,000 | $2.5 | $2,500.00 |
PIC16LC65B-04/PQ Overview
What is an 8-bit OTP microcontroller? An 8-bit microcontroller is a small computer-on-a-chip built around an 8-bit data bus, integrating a CPU core, program memory (here, OTP - one-time-programmable EPROM), data RAM, and peripherals into a single IC. OTP memory is programmed once and cannot be erased, making it ideal for high-volume production runs where code stability is locked. Within the broader semiconductor taxonomy, this part belongs to the microcontroller (MCU) category, which sits under microcontrollers and microprocessors in the integrated circuits hierarchy.
Key features include 33 bidirectional I/O pins, an integrated analog-to-digital converter (ADC), three timer/counter modules, a USART for serial communication, and a synchronous serial port (SSP). The OTP program memory supports in-circuit serial programming (ICSP) via two pins, enabling production-line programming without removing the part. The MQFP-44 package provides ample pin count for embedded control tasks while maintaining a modest 10x10 mm footprint.
Typical applications include industrial control systems, automotive body electronics, sensor interface modules, appliance controllers, and embedded data acquisition devices. The wide 2.5V-5.5V operating range allows direct connection to a single lithium cell, three alkaline cells, or regulated 5V rails, simplifying power supply design. Three timer/counter modules plus a USART support motor control, PWM generation, and master/slave multi-drop communication links.
When designing with this device, note that OTP memory cannot be re-programmed; use the PIC16F65B or PIC16C65B flash/UV-erase equivalents for prototyping and field updates. Operating temperature is 0C to +70C (commercial grade); choose the PIC16LC65BT-04I/PQ industrial variant (-40C to +85C) for outdoor or automotive under-hood deployments.
This page synthesizes current distributor pricing, drop-in Microchip PIC16 family alternatives, and practical MQFP-44 design notes not found in the manufacturer datasheet alone, helping engineers quickly evaluate substitutes and source decisions for production runs.
Drop-in alternatives for PIC16LC65B-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 PIC16LC65B-04/PQ (same form factor and footprint) — differing in ADC, Program Memory Size, Operating Temperature, Package, Timers.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC65BT-04/PQ
✅ Drop-In✓ In Stock
$5.04 / Unit
View Datasheet →PIC16LC65BT-04I/PQ
✅ Drop-In✓ In Stock
$5.45 / Unit
View Datasheet →PIC16LC65A-04I/PQ
✅ Drop-In✓ In Stock
$5.3 / Unit
View Datasheet →PIC16LC65A-04/PQ
✅ Drop-In✓ In Stock
$6.5 / Unit
View Datasheet →PIC16C65B-04/PQ
✅ Drop-In✓ In Stock
$10.25 / Unit
View Datasheet →PIC16F884-I/PT
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC65B-04/PQ Maximum Ratings & Electrical Characteristics
| Family | PIC16CXX mid-range |
| Core | 8-bit RISC |
| Program Memory Type | OTP (One-Time Programmable EPROM) |
| Program Memory Size | 7 KB (4K x 14) |
| RAM Size | 192 bytes |
| Maximum Clock Frequency | 4 MHz |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Operating Temperature Range | 0 C to +70 C (commercial) |
| Number of I/O Pins | 33 |
| ADC | Integrated |
| Timers/Counters | 3 |
| Communication Peripherals | USART, SSP (Synchronous Serial Port) |
| Package | MQFP-44 (10x10 mm) |
| Mounting Type | Surface Mount |
| ICSP Programming | Yes (In-Circuit Serial Programming) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC16LC65B-04/PQ Pin Configuration
| Pin 1 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 2 | OSC2/CLKOUT — Oscillator output / clock output |
| Pin 3 | MCLR/VPP — Master clear reset / programming voltage input |
| Pin 4 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 5 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 6 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 7 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / Voltage reference |
| Pin 8 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 9 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SSP slave select |
| Pin 10 | RE0/RD/AN5 — PORTE bit 0 / Read signal / Analog input 5 |
| Pin 11 | RE1/WR/AN6 — PORTE bit 1 / Write signal / Analog input 6 |
| Pin 12 | RE2/CS/AN7 — PORTE bit 2 / Chip select / Analog input 7 |
| Pin 13 | VDD — Positive supply voltage |
| Pin 14 | VSS — Ground reference |
| Pin 15 | OSC1 — Oscillator crystal input (alternate) |
| Pin 16 | OSC2 — Oscillator crystal output (alternate) |
| Pin 17 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock |
| Pin 18 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / CCP2 |
| Pin 19 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM 1 |
| Pin 20 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 21 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 22 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 23 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| Pin 24 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| Pin 25 | VSS — Ground reference |
| Pin 26 | RB0/INT — PORTB bit 0 / External interrupt |
| Pin 27 | RB1 — PORTB bit 1 |
| Pin 28 | RB2 — PORTB bit 2 |
| Pin 29 | RB3/PGM — PORTB bit 3 / Low-voltage programming |
| Pin 30 | RB4 — PORTB bit 4 |
| Pin 31 | RB5 — PORTB bit 5 |
| Pin 32 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pin 33 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pin 34 | VDD — Positive supply voltage |
| Pin 35 | VSS — Ground reference |
| Pin 36 | RD0 — PORTD bit 0 |
| Pin 37 | RD1 — PORTD bit 1 |
| Pin 38 | RD2 — PORTD bit 2 |
| Pin 39 | RD3 — PORTD bit 3 |
| Pin 40 | RD4 — PORTD bit 4 |
| Pin 41 | RD5 — PORTD bit 5 |
| Pin 42 | RD6 — PORTD bit 6 |
| Pin 43 | RD7 — PORTD bit 7 |
| Pin 44 | VSS — Ground reference |
Typical Applications
PIC16LC65B-04/PQ is suitable for 6 applications: Industrial Control Systems, Appliance Controllers, Sensor Interface Modules, Automotive Body Electronics, Embedded Data Acquisition, Consumer Electronics Controllers.
Industrial Control Systems
The PIC16LC65B-04/PQ fits industrial control systems through its 33 digital I/O pins, three 16-bit timer/counter modules capable of PWM generation, and integrated ADC for sensor readout. The 2.5V-5.5V supply range supports both 3.3V and 5V PLC backplanes. With 7KB OTP memory, the part locks firmware at production, preventing costly field tampering. The 4MHz clock is sufficient for relay sequencing, conveyor control, and machine-status monitoring loops. Designers should allocate adequate decoupling (100nF + 10uF) near VDD pins, and use the USART for Modbus RTU communication to a host controller.
Recommended
Appliance Controllers
The PIC16LC65B-04/PQ serves washing machines, microwave ovens, and HVAC controllers where its 33 I/O pins drive seven-segment displays, keypads, and triac-control opto-isolators. The USART links to inverter boards or wireless modules for smart-appliance connectivity. OTP memory at 7KB fits mid-complexity user-interface firmware including menu navigation, timer logic, and fault detection. The 0C to +70C commercial temperature range covers indoor appliance environments; for outdoor units, choose the PIC16LC65BT-04I/PQ industrial variant. Power consumption under the LC process is approximately 2 mA active at 4MHz, suitable for always-on control boards.
Recommended
Sensor Interface Modules
The PIC16LC65B-04/PQ handles multi-sensor data acquisition with its integrated ADC, supporting temperature, pressure, and humidity transducers in process-control cabinets. The synchronous serial port (SSP) interfaces SPI sensors and EEPROM data loggers, while the USART streams readings to a SCADA host at 9600-115200 baud. Low-power LC operation at 2.5V enables battery-backed sensor nodes that draw less than 5 mA active. With 192 bytes RAM, the part buffers several sample channels before transmission. For high-accuracy measurement, run the ADC at 4MHz ECLK with appropriate acquisition time and use averaging filters in firmware.
Recommended
Automotive Body Electronics
Although the PIC16LC65B-04/PQ is commercial grade, it serves non-critical body-electronics modules such as interior lighting, seat-position memory, and door-lock controllers where the 0C to +70C range suffices. The 33 I/O drive LED arrays, motor bridges, and switch matrices directly through appropriate driver stages. The USART links to body control modules for diagnostic communication; the ADC reads potentiometer wiper positions for seat adjustment. For under-hood or outdoor automotive use, the PIC16LC65BT-04I/PQ industrial variant extends temperature coverage to -40C to +85C, meeting most passenger-compartment requirements.
Recommended
Embedded Data Acquisition
The PIC16LC65B-04/PQ performs portable data logging in field instruments where its 2.5V minimum supply allows three-alkaline-cell operation for hundreds of hours. The 7KB OTP holds compact firmware for sampling, time-stamping, and storing readings to external EEPROM via SSP. With 192 bytes RAM, the device buffers sample bursts before committing to non-volatile storage. The 4MHz clock runs the ADC conversion and SPI transfer with margin. Engineers should add a hardware watchdog and brown-out reset to survive battery end-of-life; an external 32.768 kHz crystal can drive Timer1 for real-time-clock accuracy when wall power is absent.
Recommended
Consumer Electronics Controllers
The PIC16LC65B-04/PQ powers remote controls, toys, gaming peripherals, and small home appliances where cost per unit matters and OTP memory eliminates the need for code protection. Its 33 I/O drive IR LEDs, character LCDs, keypads, and audio feedback buzzers. The synchronous serial port connects to character LCD modules and SPI peripherals. At 4MHz clock, the device generates accurate IR carrier frequencies (38-56 kHz) for remote protocols. Designers should budget code size carefully since OTP cannot be reprogrammed; reserve the final 256 words for bootloader hooks if future migration to flash variants is anticipated. The 44-MQFP package suits compact handheld enclosures.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC65B-04/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC65BT-04/PQ | PIC16LC65BT-04I/PQ | PIC16LC65A-04I/PQ | PIC16C65B-04/PQ | PIC16F884-I/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | MQFP-44 (10x10 mm) | MQFP-44 (10x10 mm) - same | MQFP-44 (10x10 mm) - same | MQFP-44 (10x10 mm) - same | MQFP-44 (10x10 mm) - same | MQFP-44 (10x10 mm) - same |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB Flash |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz (F variant) |
| Supply Voltage Range | 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 | 2.0 V to 5.5 V |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C | -40 C to +85 C | 0 C to +70 C | -40 C to +85 C |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 256 bytes (F variant) |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM | Flash |
Key Differentiators
- Low-power LC process variant supports 2.5V minimum supply (vs PIC16C65B-04/PQ)
- 33 I/O pins and integrated ADC in 44-MQFP (vs PIC16LC63A-04I/SO)
- Same MQFP-44 footprint as flash-based PIC16F884 (vs PIC16F884-I/PT)
Design Notes
The PIC16LC65B-04/PQ draws approximately 2 mA active at 4MHz and 5V, and less than 1 uA in sleep mode. Place a 100nF ceramic decoupling capacitor as close as possible to each VDD pin (pins 13, 34), with a bulk 10uF tantalum or aluminum electrolytic on the supply rail. For battery-powered designs, use the sleep mode aggressively and wake via watchdog timer or external interrupt to extend battery life into the multi-year range.
The MQFP-44 package has 0.8 mm lead pitch and 10x10 mm body size. Route signal traces on 0.2 mm (8 mil) width or finer, and provide a continuous ground plane beneath the IC to minimize EMI. Keep the MCLR/VPP trace short and isolated from switching signals; add a 10 kohm pull-up to VDD and a 100nF capacitor to ground for clean reset behavior. For ICSP programming, dedicate the RB6/PGC and RB7/PGD pins and route them to an in-circuit programming header.
Do not use OTP (one-time-programmable) memory for prototyping - once programmed, the device cannot be erased or reprogrammed. Use a flash-based PIC16F65B or PIC16F884 equivalent for development, then port the verified firmware to the OTP part for production. Also verify that the supply voltage does not exceed 5.5V absolute maximum, especially during ICSP programming when VPP can reach 13V on the MCLR pin.
Compliance Information
RoHS compliant per distributor listings. Commercial temperature grade only - not AEC-Q100 qualified for automotive under-hood use.
