PIC16LC65A-04I/PQ - 8-bit MCU, 7KB OTP, 33 I/O, 44-MQFP | Microchip
MPN: PIC16LC65A-04I/PQ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.2 | $8.20 |
| 10 | $7.4 | $74.00 |
| 100 | $6.6 | $660.00 |
| 500 | $5.9 | $2,950.00 |
| 1,000 | $5.3 | $5,300.00 |
PIC16LC65A-04I/PQ Overview
Background: An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, memory (program + data), and peripherals on one die. The PIC architecture belongs to the RISC (Reduced Instruction Set Computer) family, characterised by a small, fixed instruction set - typically 35 single-word instructions for the PIC16CXX core - where every instruction executes in a single instruction cycle except program branches, which take two. The PIC16LC65A uses a Harvard architecture with separate program and data buses, the program memory being one-time programmable (OTP) EPROM suitable for low-to-medium volume production runs where in-circuit programming flexibility is desired without the cost of windowed ceramic parts. In the broader taxonomy this part is: microcontroller -> 8-bit MCU -> PIC16 family -> RISC processor -> embedded computing.
Key features include 33 I/O pins capable of driving LEDs, relays, or interfacing to sensors, an integrated analog comparator, a USART/SCI synchronous-asynchronous serial port, a 16-bit timer/counter with capture/compare/PWM, a Watchdog Timer with on-chip RC oscillator for safety-critical applications, and power-saving SLEEP mode. The device supports in-circuit debugging via the ICSP interface and is rated for the industrial -40C to +85C temperature range.
Architecturally, the PIC16LC65A core executes one instruction per oscillator cycle (4-clock cycle), giving 1 MIPS at 4 MHz. Its OTP EPROM memory means each cell can be programmed once; it cannot be erased electrically but can be UV-erased in windowed variants (different MPN suffix). The device includes a wide operating voltage (3.0V-5.5V) suitable for both 3.3V and 5V systems, a brown-out reset, and a low-power SLEEP mode drawing microamp-level current.
Typical applications include industrial automation controllers, automotive body and chassis subsystems, consumer electronics, white goods, HVAC controls, and small appliance motor control where 33 I/O and 192-byte RAM are sufficient.
Trade-off to consider: the OTP memory is single-program only; for design-iteration cycles the flash-based PIC16F877A in the same 44-pin family is preferable. Always add 0.1uF decoupling near VDD and verify oscillator start-up time in your layout.
This page synthesizes distributor pricing, drop-in alternatives from Microchip's own portfolio, and practical design considerations not found in the manufacturer datasheet.
Drop-in alternatives for PIC16LC65A-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 PIC16LC65A-04I/PQ (same form factor and footprint) — differing in Package, Program Memory Type, RAM Size, ADC, Communication Interfaces.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC65A-04/PQ
✅ Drop-In✓ In Stock
$6.5 / Unit
View Datasheet →PIC16LC65A-04I/L
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC65A-04I/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.65 / Unit
View Datasheet →PIC16LC64A-04I/P
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$5.2 / Unit
View Datasheet →PIC16LC64AT-04I/L
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$7.5 / Unit
View Datasheet →PIC16LC63A-04I/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$4.65 / Unit
View Datasheet →PIC16LC65A-04I/PQ Maximum Ratings & Electrical Characteristics
| Program Memory Type | OTP EPROM |
| Program Memory Size | 7 KB (4K x 14 words) |
| RAM Size | 192 bytes |
| CPU | 8-bit PIC RISC |
| Instruction Set | 35 single-word instructions |
| Maximum CPU Speed | 4 MHz (4 MIPS equivalent) |
| Supply Voltage | 3.0 V to 5.5 V |
| I/O Pins | 33 |
| Timers | 16-bit Timer/Counter with CCP |
| Communication Interfaces | USART/SCI, SSP/SPI/I2C |
| ADC | 8-bit, 8 channels (multiplexed) |
| Watchdog Timer | Yes (with on-chip RC oscillator) |
| Package | 44-pin Metric QFP (MQFP, PQ) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead Free | Yes |
PIC16LC65A-04I/PQ Pin Configuration
| Pin 1 | OSC1/CLKIN — Oscillator crystal/clock input |
| Pin 2 | OSC2/CLKOUT — Oscillator crystal/output |
| Pin 3 | MCLR/VPP — Master clear reset / programming voltage |
| Pin 4 | RA0/AN0 — Port A bit 0 / analog input 0 |
| Pin 5 | RA1/AN1 — Port A bit 1 / analog input 1 |
| Pin 6 | RA2/AN2/VREF- — Port A bit 2 / analog input 2 / VREF- |
| Pin 7 | RA3/AN3/VREF+ — Port A bit 3 / analog input 3 / VREF+ |
| Pin 8 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 9 | RA5/AN4/SS — Port A bit 5 / analog input 4 / SPI slave select |
| Pin 10 | RE0/RD/AN5 — Port E bit 0 / read control / analog input 5 |
| Pin 11 | RE1/WR/AN6 — Port E bit 1 / write control / analog input 6 |
| Pin 12 | RE2/CS/AN7 — Port E bit 2 / chip select / analog input 7 |
| Pin 13 | VDD — Positive supply voltage |
| Pin 14 | VSS — Ground |
| Pin 15 | OSC1/CLKIN — Oscillator crystal/clock input (secondary) |
| Pin 16 | OSC2/CLKOUT — Oscillator crystal/output (secondary) |
| Pin 17 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / clock input |
| Pin 18 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 |
| Pin 19 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| Pin 20 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Pin 21 | RD0/PSP0 — Port D bit 0 / parallel slave port bit 0 |
| Pin 22 | RD1/PSP1 — Port D bit 1 / parallel slave port bit 1 |
| Pin 23 | RD2/PSP2 — Port D bit 2 / parallel slave port bit 2 |
| Pin 24 | RD3/PSP3 — Port D bit 3 / parallel slave port bit 3 |
| Pin 25 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Pin 26 | RC5/SDO — Port C bit 5 / SPI data out |
| Pin 27 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| Pin 28 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| Pin 29 | RD4/PSP4 — Port D bit 4 / parallel slave port bit 4 |
| Pin 30 | RD5/PSP5 — Port D bit 5 / parallel slave port bit 5 |
| Pin 31 | RD6/PSP6 — Port D bit 6 / parallel slave port bit 6 |
| Pin 32 | RD7/PSP7 — Port D bit 7 / parallel slave port bit 7 |
| Pin 33 | VSS — Ground |
| Pin 34 | RB0/INT — Port B bit 0 / external interrupt |
| Pin 35 | RB1 — Port B bit 1 |
| Pin 36 | RB2 — Port B bit 2 |
| Pin 37 | RB3/PGM — Port B bit 3 / low-voltage programming |
| Pin 38 | RB4 — Port B bit 4 |
| Pin 39 | RB5 — Port B bit 5 |
| Pin 40 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 41 | RB7/PGD — Port B bit 7 / ICSP data |
| Pin 42 | VDD — Positive supply voltage |
| Pin 43 | VSS — Ground |
| Pin 44 | NC — Not connected (per datasheet) |
Typical Applications
PIC16LC65A-04I/PQ is suitable for 6 applications: Industrial Automation Controller, Automotive Body & Chassis Subsystems, Consumer Electronics & White Goods, HVAC Control Systems, Small Appliance Motor Control, LED Display & Signage Drivers.
Industrial Automation Controller
The PIC16LC65A-04I/PQ suits industrial PLC sub-modules and small machine controllers where 33 I/O drive sensors, relays, and motor contactors directly. Its 3.0V-5.5V supply tolerates 24V-bus-derived rails, while the -40C to +85C industrial temperature grade supports cabinet installations. The Watchdog Timer with on-chip RC oscillator prevents lockup in factory environments, and the 8-bit ADC reads analog sensor bridges without an external converter.
Recommended
Automotive Body & Chassis Subsystems
Within automotive body controllers, the PIC16LC65A-04I/PQ drives seat control, mirror positioning, and lighting modules via its 33 I/O and PWM-capable 16-bit timer. The 8-bit ADC monitors position sensors and battery voltage, while the USART interfaces to body-network peripherals. The -40C to +85C rating handles under-dash thermal conditions, though AEC-Q100-qualified variants should be selected for safety-critical subsystems.
Recommended
Consumer Electronics & White Goods
Washing machines, microwave ovens, and small kitchen appliances use the PIC16LC65A-04I/PQ as the main control MCU. The 33 I/O drive 7-segment displays, keypad matrices, and triac-fired loads, while the 7 KB OTP holds the appliance program logic. The integrated USART enables diagnostics via service tools, and SLEEP mode reduces standby power below 1 microamp for energy-star ratings.
Recommended
HVAC Control Systems
Thermostat and HVAC control boards use the PIC16LC65A-04I/PQ to read thermistor temperature, drive triac-controlled fans, and sequence compressors. The 8-bit ADC handles multiple temperature channels, while the PWM timer modulates damper actuators. The 44-pin MQFP package fits compact thermostat PCBs, and the industrial temperature range operates reliably in plenum environments.
Recommended
Small Appliance Motor Control
Universal motors in blenders, food processors, and small fans rely on the PIC16LC65A-04I/PQ for back-EMF sensing, triac phase-angle firing, and overcurrent protection. The 16-bit CCP module generates precise phase-control waveforms, while the analog comparator detects zero-cross events. The 7 KB program memory holds lookup tables and PID loops for motor control.
Recommended
LED Display & Signage Drivers
Matrix LED displays and scrolling signs employ the PIC16LC65A-04I/PQ to multiplex row/column drivers via its 33 I/O. The 7 KB OTP holds font tables and animation sequences, while the 16-bit timer drives refresh interrupts. The SSP peripheral drives daisy-chained LED driver ICs at high speed. Industrial temperature rating supports outdoor signage.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC65A-04I/PQ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC65A-04/PQ | PIC16LC65A-04I/L | PIC16LC64A-04I/P | PIC16LC63A-04I/SS |
|---|---|---|---|---|---|
| Package | MQFP-44 (PQ) | MQFP-44 (PQ) - same | MQFP-44 (PQ) - same | DIP-40 - different | SSOP-28 - different |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 6 KB OTP | 4 KB OTP |
| RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 22 |
| Max Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage | 3.0V-5.5V | 3.0V-5.5V | 3.0V-5.5V | 3.0V-5.5V | 3.0V-5.5V |
| Operating Temperature | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) | -40C to +85C (industrial) |
| Unit Price (qty 1000) | $5.30 | $5.30 | $7.50 (windowed ceramic) | $5.10 | $4.80 |
Key Differentiators
- Highest memory tier within PIC16LC6x family (vs PIC16LC63A-04I/SS)
- Industrial temperature range as standard (vs PIC16LC65A-04/PQ)
- 33 I/O pins - largest in legacy PIC16C6x portfolio (vs PIC16LC63A-04I/SS)
Design Notes
Place a 0.1uF decoupling capacitor as close as possible to each VDD pin (pins 13 and 42) and a bulk 10uF tantalum at the board-level supply entry. The PIC16LC65A has two VDD/VSS pairs (13/14 and 33/42/43) to reduce digital switching noise injection into analog circuits - both must be decoupled per Microchip layout guidelines. Brown-out reset configuration bits should be enabled for industrial applications to avoid undefined execution at low VDD.
The 44-pin MQFP has a 0.8 mm lead pitch and requires careful PCB land pattern design per IPC-7351. Use a solder mask-defined (SMD) pad rather than non-solder mask-defined (NSMD) for easier rework. Keep analog input traces (RA0-RA5, RE0-RE2) short and away from switching signals like the oscillator or PWM outputs to minimise ADC noise coupling. The exposed thermal pad is not present on this package; thermal management is passive only.
The OTP EPROM memory can be programmed only once - any bit-cell programmed becomes a logical 0 and cannot be electrically erased. Design teams commonly attempt to use OTP parts for prototype iteration and waste parts; Microchip strongly recommends using the PIC16F877A (flash) or PIC16LC65A-04I/L (windowed UV-erase) for development, then transition to the OTP PIC16LC65A-04I/PQ for production. Also note that configuration bits are part of the program memory and cannot be changed after programming without a new device.
The PIC16LC65A's parallel slave port (PSP) on port D shares the same pins with general I/O - ensure the PSP control bits (PSPMODE in TRISE) are cleared when PSP is not in use to prevent bus contention. The USART TX/RX pins (RC6/RC7) are shared with the synchronous clock/data functions; confirm the SPEN/CREN register bits match the desired serial mode. Watchdog Timer postscaler must be tuned to avoid spurious resets under heavy interrupt load.
Compliance Information
Microchip PIC16LC65A-04I/PQ is RoHS compliant per Microchip product page. Not AEC-Q100 qualified; not recommended for safety-critical automotive subsystems without further qualification.
