PIC16LC64AT-04I/L - 8-bit OTP MCU, 4MHz, 3.5KB, 44-PLCC | Microchip
MPN: PIC16LC64AT-04I/L β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $9.95 | $995.00 |
| 500 | $8.75 | $4,375.00 |
| 1,000 | $7.5 | $7,500.00 |
PIC16LC64AT-04I/L Overview
A PIC (Peripheral Interface Controller) microcontroller is a compact, self-contained computer-on-a-chip that integrates a CPU, memory, and peripherals into a single IC. The PIC16C family is part of Microchip's mid-tier 8-bit MCU lineup, sitting between the baseline PIC10/12/16 families and the higher-end PIC18 family. These MCUs use a Harvard architecture with separate program and data buses, enabling single-cycle instruction execution for most opcodes. Within the broader taxonomy, an 8-bit MCU is a type of microcontroller -> embedded processor -> semiconductor IC.
Key features include 35 single-word instructions (only 14-bit wide), single-cycle operation on all instructions except branches (which take two cycles), DC to 20 MHz operating speed, an 8-level hardware stack, and integrated I2C and SPI synchronous serial communication peripherals. The PIC16LC64A also integrates a watchdog timer, up to four timer modules, and a Capture/Compare/PWM (CCP) module, providing flexible embedded control for cost-sensitive applications.
The PIC16LC64A core uses a RISC-based architecture with a 14-bit instruction word and 8-bit data path, achieving approximately 5 MIPS performance at 20 MHz. The integrated peripherals include a 10-bit (approximate) ADC, USART, I2C, SPI, and multiple timer/counter modules. The CMOS process delivers low power consumption with typical active current around 2-5 mA at 4 MHz, making it suitable for both battery-powered and line-powered designs.
Typical applications include industrial control systems, consumer appliance control, automotive body electronics (non-safety), sensor signal conditioning, and low-cost embedded control where deterministic 8-bit processing is sufficient. The OTP program memory allows prototype-to-production migration with one-time-programmed code, lowering per-unit cost versus flash-based alternatives.
When designing with this MCU, ensure the oscillator configuration is correctly selected (RC, XT, HS, or LP) to match the clock source, and that brown-out reset (BDR) is properly enabled for robust startup. The 44-PLCC package provides socket-friendly through-hole compatibility for prototyping and field-serviceable legacy systems.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for PIC16LC64AT-04I/L β 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 PIC16LC64AT-04I/L (same form factor and footprint) β differing in RAM Size, Mounting Type, Program Memory Size, Program Memory Type, Communication Interfaces.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16LC64A-04I/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16LC64AT-04/L
β Drop-Inπ Reference alternative (not in catalog)
PIC16LC64A-04I/PQ
β Drop-Inπ Reference alternative (not in catalog)
PIC16LC64AT-04I/PQ
β Drop-Inβ In Stock
$6.1 / Unit
View Datasheet βPIC16LC64AT-04/PT
β Drop-Inβ In Stock
$5.25 / Unit
View Datasheet βPIC16LC64AT-04I/L Maximum Ratings & Electrical Characteristics
| Core Architecture | PIC 8-bit RISC |
| Family | PIC16C |
| Sub-family | PIC16LC64A |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 3.5 KB (2K x 14) |
| RAM Size | 128 x 8 bytes |
| Maximum Clock Speed | 4 MHz |
| Supply Voltage Range | 3.0 V to 5.5 V |
| I/O Pins | 33 |
| Instruction Word Width | 14-bit |
| Instruction Set Size | 35 instructions |
| Communication Interfaces | I2C, SPI |
| Package | 44-PLCC (J-Lead, 16.59 x 16.59 mm) |
| Operating Temperature Range | -40C to +85C (Industrial) |
| Mounting Type | Surface Mount (PLCC socket compatible) |
PIC16LC64AT-04I/L Pin Configuration
| Pin 1 | RA0/AN0 β Port A bit 0 / Analog input 0 |
| Pin 2 | RA1/AN1 β Port A bit 1 / Analog input 1 |
| Pin 3 | RA2/AN2 β Port A bit 2 / Analog input 2 |
| Pin 4 | RA3/AN3/VREF β Port A bit 3 / Analog input 3 / Voltage reference |
| Pin 5 | RA4/T0CKI β Port A bit 4 / Timer 0 clock input |
| Pin 6 | RA5/AN4/SS β Port A bit 5 / Analog input 4 / SPI slave select |
| Pin 7 | OSC1/CLKIN β Oscillator input / external clock input |
| Pin 8 | OSC2/CLKOUT β Oscillator output / clock output |
| Pin 9 | MCLR β Master clear reset (active low) |
| Pin 10 | VSS β Ground reference |
| Pin 11 | VDD β Positive supply voltage (3.0 V to 5.5 V) |
| Pin 12 | RB0/INT β Port B bit 0 / External interrupt input |
| Pin 13 | RB1 β Port B bit 1 |
| Pin 14 | RB2 β Port B bit 2 |
| Pin 15 | RB3 β Port B bit 3 |
| Pin 16 | RB4 β Port B bit 4 |
| Pin 17 | RB5 β Port B bit 5 |
| Pin 18 | RB6 β Port B bit 6 / In-circuit debug clock |
| Pin 19 | RB7 β Port B bit 7 / In-circuit debug data |
| Pin 20 | VSS β Ground reference |
| Pin 21 | VDD β Positive supply voltage (3.0 V to 5.5 V) |
| Pin 22 | RC0 β Port C bit 0 |
| Pin 23 | RC1 β Port C bit 1 |
| Pin 24 | RC2 β Port C bit 2 |
| Pin 25 | RC3 β Port C bit 3 |
| Pin 26 | RC4 β Port C bit 4 |
| Pin 27 | RC5 β Port C bit 5 |
| Pin 28 | RC6 β Port C bit 6 |
| Pin 29 | RC7 β Port C bit 7 |
| Pin 30 | VSS β Ground reference |
| Pin 31 | VDD β Positive supply voltage (3.0 V to 5.5 V) |
| Pin 32 | RD0 β Port D bit 0 |
| Pin 33 | RD1 β Port D bit 1 |
| Pin 34 | RD2 β Port D bit 2 |
| Pin 35 | RD3 β Port D bit 3 |
| Pin 36 | RD4 β Port D bit 4 |
| Pin 37 | RD5 β Port D bit 5 |
| Pin 38 | RD6 β Port D bit 6 |
| Pin 39 | RD7 β Port D bit 7 |
| Pin 40 | VSS β Ground reference |
| Pin 41 | VDD β Positive supply voltage (3.0 V to 5.5 V) |
| Pin 42 | RE0 β Port E bit 0 |
| Pin 43 | RE1 β Port E bit 1 |
| Pin 44 | RE2 β Port E bit 2 |
Typical Applications
PIC16LC64AT-04I/L is suitable for 6 applications: Industrial Control Systems, Consumer Electronics Control, Automotive Body Electronics, Sensor Signal Conditioning Hubs, Legacy Embedded System Maintenance, Educational and Prototyping Platforms.
Industrial Control Systems
The PIC16LC64AT-04I/L is well-suited for industrial control applications such as motor control, sensor interface boards, and PLC I/O modules. Its 3.0 V to 5.5 V wide supply range supports both 3.3 V and 5 V industrial bus architectures, while 4 MHz clock and 1 MIPS performance deliver deterministic control loop timing for servo positioning or conveyor sequencing. The 33 I/O pins can drive multiple optocouplers and indicator LEDs directly, and the integrated I2C/SPI peripherals interface with digital sensors, EEPROMs, and HMI displays. The OTP memory provides tamper-proof firmware critical for regulated industrial environments where code cannot be field-modified, and the industrial -40C to +85C temperature grade handles factory floor conditions. Per Microchip application notes, similar PIC16C6X parts are deployed in millions of industrial controllers.
Recommended
Consumer Electronics Control
The PIC16LC64AT-04I/L fits consumer appliance controllers including washing machines, microwave ovens, air conditioners, and small kitchen electronics, typically where key performance per dollar matters. The 3.5 KB OTP memory stores appliance firmware (state machines, timer logic, keypad scanning) at minimal per-unit cost versus flash-based alternatives, while 128 bytes RAM handles stack and runtime variables for typical appliance control loops. The integrated I2C peripheral interfaces with temperature sensors, EEPROM presets, and LED/LCD display modules. Per Microchip's design guidance, the PIC16C6X family has shipped in over a billion consumer units, demonstrating proven reliability in sealed appliance environments where field firmware updates are not required.
Recommended
Automotive Body Electronics
The PIC16LC64AT-04I/L serves automotive body electronics modules such as lighting controllers, mirror adjusters, seat position memory, and HVAC blend-door drivers. Its 33 I/O pins handle multiple switch inputs and actuator outputs in centralized body modules, while the I2C peripheral interfaces with LIN-bus transceivers and dashboard displays. The 3.0 V to 5.5 V supply tolerates automotive cranking transients (when paired with external voltage regulators) and the industrial temperature grade covers cabin environments. However, note that this part is NOT AEC-Q100 qualified - for safety-critical applications, Microchip's PIC16F variants with automotive qualification are required. Per industry practice, non-safety body modules remain good candidates for the PIC16LC64A family.
Recommended
Sensor Signal Conditioning Hubs
The PIC16LC64AT-04I/L operates as a sensor hub aggregating multiple analog and digital sensors in HVAC, building automation, and remote-monitoring systems. Its 33 I/O pins accommodate numerous digital sensor inputs (PIR motion, reed switches, door contacts), while the I2C/SPI peripherals connect to digital temperature, humidity, and pressure sensors. The 4 MHz clock and 1 MIPS performance handle sensor fusion algorithms and threshold detection in real-time. Per the PIC16C6X datasheet, the integrated ADC (10-bit approximation) reads analog sensors directly without external components. OTP memory prevents firmware tampering in deployed building-automation installations where field-modification risk is a security concern.
Recommended
Legacy Embedded System Maintenance
The PIC16LC64AT-04I/L is the form-fit-function replacement for maintaining legacy PIC16C64A-based equipment still in service across industrial, medical, and aerospace systems. The 44-PLCC socket-compatible package allows field replacement of failed boards in systems originally deployed in the 1990s and 2000s, eliminating the need for costly redesign or obsolescence-driven requalification. Per Microchip's product longevity program, the PIC16C6X family has been in continuous production since 1995 and remains available for long-life-cycle customers. The OTP memory matches the original design's code-storage strategy, ensuring that existing firmware images are directly compatible without recompilation or reprogramming.
Recommended
Educational and Prototyping Platforms
The PIC16LC64AT-04I/L serves educational laboratories and engineering prototyping where students learn 8-bit embedded programming on a well-documented, industry-standard MCU. The 44-PLCC package accommodates low-volume socketed programming and erase/replace cycles during development, while the 3.5 KB OTP memory matches typical course assignments (LED blinking, keypad scanning, serial communication protocols). Per Microchip's academic program, the PIC16C6X family is supported by MPLAB IDE, ICD debug tools, and a vast library of application notes and code examples. The 33 I/O pins and I2C/SPI peripherals enable lab projects from traffic-light controllers to simple data-acquisition systems.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC64AT-04I/L β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC64A-04I/L | PIC16LC64AT-04/L | PIC16LC64A-04I/PQ | PIC16LC64AT-04I/PQ | PIC16LC64AT-04/PT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-PLCC (J-Lead) | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead) - same | 44-PLCC (J-Lead, PQ) - same | 44-PLCC (J-Lead, PQ) - same | 44-PLCC (J-Lead, PT) - same |
| Core / Family | PIC 8-bit / PIC16C | PIC 8-bit / PIC16C | PIC 8-bit / PIC16C | PIC 8-bit / PIC16C | PIC 8-bit / PIC16C | PIC 8-bit / PIC16C |
| Program Memory Type | OTP | OTP | OTP | OTP | OTP | OTP |
| Program Memory Size | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) | 3.5 KB (2K x 14) |
| RAM Size | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Maximum Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage Range | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| Operating Temperature Grade | Industrial (-40C to +85C) | Commercial (0C to +70C) | Commercial (0C to +70C) | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial (0C to +70C) |
Key Differentiators
- OTP memory for ultra-low-cost per-unit production at high volumes (vs PIC16F84A (Flash-based, 1.75 KB, 18-pin))
- 44-PLCC socket compatibility for legacy system maintenance (vs PIC16C64A-04I/P (40-pin PDIP through-hole))
- Industrial temperature grade (-40C to +85C) standard on this part number (vs PIC16LC64AT-04/L (commercial grade, 0C to +70C))
- 33 I/O pins support complex multi-peripheral designs (vs PIC16F628 (18-pin, 16 I/O))
Design Notes
The PIC16LC64AT-04I/L operates from 3.0 V to 5.5 V with multiple VDD/VSS pin pairs (pins 11/10, 21/20, 31/30, 41/40) that must each be connected to the supply. Decoupling capacitors of 100 nF ceramic should be placed adjacent to each VDD/VSS pair to suppress switching noise from the internal oscillator and I/O transitions. For battery-powered designs, the 'LC' variant's CMOS process delivers typical active current of 2-5 mA at 4 MHz and standby current under 10 microamps in sleep, enabling multi-year battery life with proper duty-cycling per Microchip AN719 application note guidance.
Route the oscillator traces (OSC1/CLKIN pin 7, OSC2/CLKOUT pin 8) with minimal trace length to ground reference and keep them away from high-current switching traces to prevent clock corruption. For crystal oscillator configurations, place the load capacitors (typically 15-33 pF depending on crystal specification) directly between each oscillator pin and ground. The MCLR pin (pin 9) requires an external pull-up of 10 kOhm to VDD for reliable reset; for in-circuit programming capability, place a diode or resistor network per Microchip ICSP specification to allow low-voltage programming entry.
Common pitfalls when designing with this OTP part include: (1) attempting to reprogram after code is locked in (OTP cannot be erased - one firmware version per unit, plan for A/B pre-programmed part numbers if field-update risk exists); (2) exceeding 4 MHz clock with the '04' speed grade (use '20' suffix parts for 20 MHz operation); (3) misconfiguring oscillator mode fuses (FOSC bits) for the actual clock source - using HS mode with a low-frequency crystal prevents startup; (4) forgetting that PORTB has weak internal pull-ups that must be disabled via RBPU bit for low-power sleep operation per Microchip PIC16C6X datasheet Section 7.
Compliance Information
RoHS and REACH compliance status not explicitly listed in verified data; this part was introduced in the 1990s and may be supplied in legacy non-RoHS packaging. AEC-Q100 not applicable for non-automotive-safety parts. Recommend verifying with Microchip's product compliance declaration before use in regulated applications.
