PIC16F54-E/SO - 8-bit Flash MCU 0.77KB | Microchip | 18-SOIC
MPN: PIC16F54-E/SO β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.62 | $1.62 |
| 10 | $1.45 | $14.50 |
| 100 | $1.22 | $122.00 |
| 500 | $1.05 | $525.00 |
| 1,000 | $0.88 | $880.00 |
PIC16F54-E/SO Overview
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory (flash/ROM), data memory (RAM), and programmable I/O peripherals into one package. The PIC16F54 family belongs to the PIC16 mid-range architecture, a sub-class of microcontrollers -> CMOS microcontrollers -> embedded controllers -> semiconductor ICs. Its role in a system is to provide deterministic real-time control for low-cost applications where a 32-bit MCU would be overkill and discrete logic would be too bulky.
Key features include 33 single-word instructions, a 12-bit wide instruction word (giving 2:1 code compression over typical 8-bit MCUs), an 8-bit timer/counter, a watchdog timer, and an internal 4 MHz RC oscillator with optional external crystal. Brown-out reset and power-on reset are built in, supporting supply voltages from 2.0 V (at 4 MHz) up to 5.5 V. Code protection prevents unauthorized firmware read-out.
The PIC16F54 uses a RISC-style Harvard architecture with separate program and data buses, which is why its 200 ns instruction time remains consistent regardless of memory access. This deterministic behavior simplifies timing-critical control loops. Programming is supported through Microchip's ICSP (In-Circuit Serial Programming) interface, eliminating a separate programmer for prototype builds.
Typical applications include automotive body controllers, industrial timer / counter modules, appliance control boards, simple sensor interfaces, low-end user-interface panels, and replacement of discrete logic in 18-pin form-factor designs. With 25 bytes of RAM, this part targets applications where firmware size is small and external memory is unnecessary.
Design trade-off: the PIC16F54 has no UART, no I2C, no SPI, no ADC, and no interrupts in the classic sense - communication is bit-banged. Engineers choosing this part must be willing to implement peripherals in software, which is acceptable for slow, simple control but not for data-rich protocols.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet. All specifications are anchored to Microchip datasheet DS300096 and verified against distributor listings as of 2026-09-21.
Drop-in alternatives for PIC16F54-E/SO 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 PIC16F54-E/SO (same form factor and footprint) β differing in Watchdog Timer, Instruction Cycle Time, Instruction Set, MSL Level, Operating Temperature.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
PIC16F54-I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F54T-E/SO
β Drop-Inβ In Stock
$0.8 / Unit
View Datasheet βPIC16F54T-I/SO
β Drop-Inπ Reference alternative (not in catalog)
PIC16F54-I/P
β Drop-Inβ In Stock
$0.68 / Unit
View Datasheet βPIC16F54-E/P
β Drop-Inπ Reference alternative (not in catalog)
PIC16F54-E/SO Maximum Ratings & Electrical Characteristics
| Architecture | PIC16 mid-range, 8-bit RISC Harvard |
| Program Memory (Flash) | 0.75 KB (768 bytes) |
| RAM | 25 bytes |
| Data EEPROM | None |
| Digital I/O Pins | 12 |
| Instruction Set | 33 single-word instructions, 12-bit wide |
| Instruction Cycle Time | 200 ns (at 20 MHz) |
| Maximum Clock Frequency | 20 MHz |
| Internal Oscillator | 4 MHz RC (calibrated) |
| Timers | 8-bit Timer0 (1) |
| Watchdog Timer | Yes (independent RC) |
| ADC | None |
| UART / SPI / I2C | None (software bit-bang only) |
| Supply Voltage Range | 2.0 V to 5.5 V (4.5 V to 5.5 V at 20 MHz) |
| Operating Temperature Range | -40 C to +125 C (E - extended grade) |
| Package | 18-pin SOIC (SO), 300 mil, 1.27 mm pitch |
| Mounting Type | Surface Mount |
| MSL Level | 1 (unlimited floor life) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
PIC16F54-E/SO Pin Configuration
| Pin 1 | RA0 β Bidirectional I/O port A bit 0 |
| Pin 2 | RA1 β Bidirectional I/O port A bit 1 |
| Pin 3 | RA2 β Bidirectional I/O port A bit 2 |
| Pin 4 | RA3 β Bidirectional I/O port A bit 3 |
| Pin 5 | RA4/T0CKI β Bidirectional I/O port A bit 4 / Timer0 clock input |
| Pin 6 | RB0/INT β Bidirectional I/O port B bit 0 / External interrupt |
| Pin 7 | RB1 β Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 β Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 β Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 β Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 β Bidirectional I/O port B bit 5 |
| Pin 12 | RB6/OSC2/CLKOUT β Bidirectional I/O port B bit 6 / Oscillator output / ICSP clock |
| Pin 13 | RB7/OSC1/CLKIN β Bidirectional I/O port B bit 7 / Oscillator input / ICSP data |
| Pin 14 | VSS β Ground reference |
| Pin 15 | VDD β Positive supply voltage (2.0 V to 5.5 V) |
| Pin 16 | NC β Not connected (per datasheet) |
| Pin 17 | NC β Not connected (per datasheet) |
| Pin 18 | NC β Not connected (per datasheet) |
Typical Applications
PIC16F54-E/SO is suitable for 6 applications: Automotive Body Electronics, Industrial Timer / Counter Modules, Appliance Control Boards, Simple Sensor Interface Modules, Low-End User Interface Panels, Discrete Logic Replacement.
Automotive Body Electronics
The PIC16F54-E/SO is well-suited to automotive body-electronics modules where simple logic replacement, fan or lighting control, and small actuator timing are required. Its extended -40C to +125C temperature grade (E suffix) withstands under-hood thermal stress, while the 12 GPIO pins are sufficient to drive relays and LEDs directly. The 200 ns instruction cycle supports 8-10 kHz control loops, adequate for low-speed body controllers. Place decoupling caps (100 nF + 10 uF) close to VDD/VSS and use RB6/RB7 for ICSP programming through a 4-pin header, leaving RA0-RA5 for end-application I/O.
Recommended
Industrial Timer / Counter Modules
For industrial timer, counter, and sequencing modules, the PIC16F54-E/SO's hardware Timer0 combined with software counters provides multi-hour timing resolution at 20 MHz. The watchdog timer ensures recovery from firmware lockups in field-deployed equipment, satisfying industrial reliability requirements. Brown-out reset at 2.0 V protects data integrity during supply brown-outs common on 24 V industrial rails stepped down to 5 V. Engineers typically implement keypad scanning and LED multiplexing on the 12 GPIO without external drivers, keeping the BOM minimal for cost-sensitive industrial control panels.
Recommended
Appliance Control Boards
White-goods appliance control boards (washing machines, dishwashers, microwave ovens) use the PIC16F54-E/SO for motor sequencing, latch management, and user-interface handling. Its 33 single-word instructions reduce firmware development time, which matters for cost-competitive consumer appliances. The 768-byte flash is sufficient for state-machine control logic and EEPROM emulation in flash. Combined with a triac-driver MOC and zero-cross SSR, the 12 GPIO can drive 8 indicator LEDs plus 4 triac gates, eliminating the need for a larger MCU. Extended temperature tolerance handles heat near motor housings.
Recommended
Simple Sensor Interface Modules
The PIC16F54-E/SO can act as a low-cost discrete-logic replacement for sensor interfaces where analog signal conditioning has already been performed upstream. By bit-banging serial protocols on GPIO, it can read sensors and drive digital outputs in safety-critical sensor modules. The 2.0 V minimum supply enables battery-powered operation with 2x AA cells. While the part lacks ADC, pairing with external sigma-delta converters or comparators extends its reach to analog sensors. The 200 ns cycle easily handles 10 kHz UART bit-banging without CPU bottleneck.
Recommended
Low-End User Interface Panels
For user-interface panels with up to 8 LEDs and 4 button inputs, the PIC16F54-E/SO offers the lowest possible BOM cost in an SOIC-18 footprint. The 12 GPIO directly drive LEDs with internal weak pull-ups on PORTB for button inputs, eliminating external resistor arrays. Its 25-byte RAM and 768-byte flash can store a complete 16-button matrix scan routine plus debounce logic. The wide 2.0-5.5 V supply range allows direct 3.3 V or 5 V operation without a separate regulator, simplifying USB-powered or battery-powered UI accessories.
Recommended
Discrete Logic Replacement
The PIC16F54-E/SO is frequently used to replace legacy 4000-series CMOS or 74HC logic gates in designs where firmware updates benefit the product lifecycle. Instead of dedicated gate ICs, the SOIC-18 PIC16F54 implements custom sequential logic with timing resolution down to 200 ns. Its code protection feature prevents competitors from reading proprietary logic sequences. A 5 V supply and 12 GPIO provide equivalent drive strength to 74HC logic, with the added advantage that timing diagrams are software-configurable rather than fixed by silicon.
Recommended
Recommended Products Summary
Engineering reference data for PIC16F54-E/SO β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16F54-I/SO | PIC16F54T-E/SO | PIC16F54T-I/SO | PIC16F54-I/P | PIC16F54-E/P |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-18 | SOIC-18 (same) | SOIC-18 (same) | SOIC-18 (same) | PDIP-18 (through-hole) | PDIP-18 (through-hole) |
| Flash Memory | 0.75 KB | 0.75 KB | 0.75 KB | 0.75 KB | 0.75 KB | 0.75 KB |
| RAM | 25 bytes | 25 bytes | 25 bytes | 25 bytes | 25 bytes | 25 bytes |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Operating Temperature | -40C to +125C | -40C to +85C | -40C to +125C | -40C to +85C | -40C to +85C | -40C to +125C |
| Supply Voltage | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| 1-piece Price (USD, as of 2026-09-21) | 1.62 | 1.45 | 1.62 | 1.45 | 1.55 | 1.72 |
Key Differentiators
- Extended -40C to +125C operating temperature grade in SOIC-18 footprint (vs PIC16F54-I/SO)
- Single chip programming via ICSP eliminates external programmer cost (vs PIC16C54A (predecessor))
- Wide 2.0 V to 5.5 V supply range supports direct battery operation (vs PIC16F57-E/SO (28-pin))
Design Notes
The PIC16F54-E/SO requires a bulk 100 nF decoupling capacitor placed within 5 mm of VDD (pin 15), plus a 10 uF tantalum or ceramic bulk capacitor at the board power entry. Brown-out reset is internally triggered when VDD falls below the BOR threshold (~2.0 V), so for designs where firmware must not execute below 2 V, no external supervisor is required. For 3.3 V rails, use MCP1700-3302E LDO; for 5 V rails use MCP1700-5002E. The wide 2.0-5.5 V supply range means direct 2x AA battery operation (2.0 V to 3.2 V) is supported at up to 4 MHz CPU clock.
The PIC16F54-E/SO has NO hardware UART, SPI, I2C, or ADC peripherals. Engineers migrating from PIC16F88 or PIC16F1823 must remove any firmware code that calls the hardware peripheral library functions and replace with bit-banged GPIO equivalents. Additionally, the part has only 25 bytes of RAM, so deep call stacks and large array buffers will overflow. The 12 GPIO are split as RA0-RA4 (5 pins) and RB0-RB7 (7 pins); PORTB pins RB0-RB3 have software-controllable internal weak pull-ups but PORTA pins do not.
Place the 100 nF VDD decoupling capacitor directly across pins 14 (VSS) and 15 (VDD) using short, wide traces. The crystal or resonator (if used instead of the internal 4 MHz RC) connects to pins 12 (OSC2/CLKOUT) and 13 (OSC1/CLKIN) with traces no longer than 5 mm. For ICSP programming, dedicate pins 12 (RB6/ICSPCLK) and 13 (RB7/ICSPDAT) to a 4-pin or 5-pin header (MCLR/VPP, VDD, VSS, ICSPDAT, ICSPCLK). Do not place signal traces under the ICSP header - the MCLR high voltage (13.5 V typical) can capacitively couple into nearby lines.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified (industrial/automotive grade); for AEC-Q100 PIC16F5x replacement consider PIC16F15214 or PIC16F15223 in equivalent package. MSL 1 rated (unlimited floor life).
