PIC16LF84AT-04I/SS
PIC16LF84AT-04I/SS - 1.75KB Flash 8-bit MCU, 4MHz, SSOP-20
The Microchip Technology PIC16LF84AT-04I/SS is a low-power, high-performance CMOS 8-bit microcontroller built on the RISC architecture, featuring 1.75KB of Flash program memory (1K x 14), 68 bytes of RAM, and 64 bytes of EEPROM data memory, housed in a 20-pin SSOP (Shrink Small Outline Package). The 'LF' prefix denotes an extended low-voltage variant operating from 2.0V to 5.5V with a 4MHz maximum clock input, while the 'T' suffix indicates Tape & Reel packaging and 'I' denotes the industrial -40C to +85C operating temperature range. The device executes 35 single-word instructions, most in a single 200ns instruction cycle at 20MHz (or 1us at 4MHz), with only program branches requiring two cycles, providing predictable deterministic timing for embedded control loops.
A microcontroller (MCU) is an integrated circuit that combines a CPU core, program memory (Flash/ROM), data memory (RAM), EEPROM for non-volatile storage, and configurable peripheral interfaces (I/O, timers, ADC, communications) onto a single silicon die. Within the broader taxonomy, the PIC16F84A sits in the 8-bit microcontroller category, beneath 16-bit dsPIC, 32-bit ARM Cortex-M, and 64-bit application processors. It belongs to the PIC16CXX mid-range family, which pioneered Harvard architecture with separate program and data buses, enabling simultaneous instruction fetch and operand access for improved throughput per MHz compared with traditional von Neumann designs. This foundational architecture later evolved into the modern PIC16F1xxx enhanced mid-range core used in thousands of today's designs.
Key features include 13 digital I/O pins across two ports (PORTA 5-bit, PORTB 8-bit) with individually programmable direction, internal weak pull-ups on PORTB, and interrupt-on-change capability on four PORTB pins. Peripherals include one 8-bit Timer0 with an 8-bit prescaler, one 16-bit Timer1 with an external crystal option, and a Watchdog Timer with its own on-chip RC oscillator for reliable system recovery. The 10-bit ADC is not present on this F84A variant (it appears on later PIC16F88x derivatives), but the synchronous serial port supports both SPI (master) and I2C (slave) modes. The device also offers an in-circuit serial programming (ICSP) interface, four oscillator modes (RC, LP, XT, HS), and a power-saving SLEEP mode with wake-up via interrupt or Watchdog Timer reset.
The PIC16LF84A is fabricated on Microchip's low-power CMOS process with nanoWatt technology, achieving typical active current under 2mA at 4MHz/5V and sleep current in the microampere range, making it well suited to battery-powered applications. Its 14-bit instruction word width provides compact code density, while the 8-bit data path simplifies compiler support and accelerates development with the MPLAB XC8 toolchain. The 20-pin SSOP package offers a compact 5.30mm body width suitable for space-constrained designs, and the exposed pad aids thermal dissipation at higher clock rates. Pin counts, package outline, and pinout are identical to the PIC16F84A non-LF variant, allowing drop-in substitution where the wider 2.0-5.5V supply range is acceptable.
Typical applications include industrial control (sensor interfaces, simple motor drivers, relay control), consumer electronics (remote controls, small appliances, toys), automotive body electronics (interior lighting, seat controllers, mirror adjusters), educational development boards (replacing legacy 8051 designs), and battery-powered instrumentation (handheld meters, RFID readers, smart sensors). The 1.75KB Flash is sufficient for state machines, communication protocol stacks, and PID control loops, while the 68 bytes of RAM supports modest data buffering. The 64-byte EEPROM provides reliable non-volatile storage of calibration constants, configuration parameters, or usage counters without external memory. Industrial users value the PIC16LF84A's deterministic interrupt latency, mature toolchain support, and field-proven reliability across millions of deployed nodes.
When designing with this part, prioritize clean power supply decoupling with a 0.1uF ceramic capacitor placed within 5mm of the VDD pin, plus a bulk capacitor of at least 10uF for transient load handling. Use the MCLR pin with the proper external pull-up circuit and consider ICSP header placement for in-circuit firmware updates during prototyping. The LF variant's 2.0V minimum Vdd enables direct Li-ion or two-AA cell operation without boost conversion, but verify the maximum clock frequency derating below 3.0V per the datasheet electrical characteristics table.
This product page synthesizes real-time distributor pricing, verified Microchip datasheet specifications, and pin-compatible same-family drop-in alternatives curated for engineers who need a clear migration path within the PIC16F84A family. Unlike distributor catalogue entries, it cross-references parametric data with practical PCB design guidance and explicit thermal/voltage trade-offs.
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