PIC16LC554T-04I/SO - 8-bit 4MHz OTP MCU 896B | Microchip
MPN: PIC16LC554T-04I/SO ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.62 | $26.20 |
| 100 | $2.3 | $230.00 |
| 500 | $2.05 | $1,025.00 |
| 1,000 | $1.78 | $1,780.00 |
PIC16LC554T-04I/SO Overview
An 8-bit PIC microcontroller is a class of CMOS RISC microprocessor that integrates CPU core, non-volatile program memory (ROM/EPROM/OTP/Flash), data RAM, working registers, and programmable I/O into a single chip. Within the broader taxonomy, PIC MCUs sit under microcontroller (MCU) -> embedded processor -> semiconductor IC. The PIC16C5X baseline architecture is the entry-level tier in Microchip's PIC portfolio, optimized for cost-sensitive, deterministic, low-to-medium complexity embedded control where every cycle must be predictable.
Key features include a 4 MHz oscillator, hardware reset, watchdog timer, power-on reset, and 12 bidirectional I/O lines multiplexed with peripheral functions. The 8-bit-wide data path, 7-level hardware stack, and 12-bit instruction word yield compact code density typical of baseline PIC silicon. The 'LC' voltage class explicitly targets low-voltage operation down to 3.0 V, distinguishing it from the 4.5 V-minimum PIC16C554 and from PIC16F flash-equipped variants.
The PIC16LC554T-04I/SO uses a RISC Harvard architecture with separate program and data buses, allowing simultaneous instruction fetch and operand access. Its 2-level deep stack and 25-byte register file limit interrupt depth but maximize interrupt response predictability. The 'T' suffix in the MPN denotes tape-and-reel packaging; '-04' denotes 4 MHz maximum clock; the 'I' suffix indicates the industrial operating temperature range of -40C to +85C; 'SO' denotes 18-pin SOIC.
Typical applications include appliance control, security-system keypads, simple sensor interfaces, low-end consumer electronics, hobby/educational projects, and any cost-constrained embedded design that benefits from a stable, well-documented 8-bit platform with mature toolchain support. The wide 3.0-6.25 V input range makes it compatible with both 3.3 V and 5 V system rails.
When designing with the PIC16LC554T-04I/SO, account for OTP (one-time programmable) limitations: firmware cannot be field-upgraded after programming. Plan code carefully, leave margin for late-stage feature additions, and consider PIC16F flash alternatives (e.g. PIC16F505, PIC16F506) for prototypes or designs requiring firmware iteration. The 80-byte RAM budget is tight by modern standards - favor compact variables and reuse register banks.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet, helping engineers quickly evaluate whether the PIC16LC554T-04I/SO fits their application or whether a flash-based successor is a more appropriate choice.
Drop-in alternatives for PIC16LC554T-04I/SO — 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 PIC16LC554T-04I/SO (same form factor and footprint) — differing in Core Architecture, Operating Temperature Range, Program Memory Size, RAM Size, Watchdog Timer.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
PIC16LC554T-04/SO
✅ Drop-In✓ In Stock
$3.85 / Unit
View Datasheet →PIC16C554T-04I/SO
✅ Drop-In📋 Reference alternative (not in catalog)
PIC16LC554T-04I/SS
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$1.24 / Unit
View Datasheet →PIC16LC554T-04I/SO Maximum Ratings & Electrical Characteristics
| Core Architecture | 8-bit PIC RISC |
| Series | PIC 16C |
| Core Sub-family | PIC16C5X (baseline) |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 896 B (512 x 14 bit) |
| RAM Size | 80 B |
| Maximum Clock Frequency | 4 MHz |
| Supply Voltage Range | 3.0 V to 6.25 V |
| Number of I/O Pins | 12 |
| Instruction Set Width | 12 bit |
| Number of Instructions | 33 single-word/cycle |
| Package | 18-pin SOIC (SO) |
| Mounting Type | Surface Mount |
| Operating Temperature Range | -40C to +85C (industrial, 'I' grade) |
| Delivery Form | Tape & Reel ('T' suffix) |
| Watchdog Timer | Yes (on-chip WDT) |
| Power-on Reset | Yes |
PIC16LC554T-04I/SO Pin Configuration
| Pin 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pin 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pin 3 | T0CKI — Timer0 clock input / RA4 |
| Pin 4 | MCLR — Master Clear (reset) input, active low |
| Pin 5 | VSS — Ground reference |
| Pin 6 | RB0 — Bidirectional I/O port B bit 0 |
| Pin 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pin 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pin 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pin 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pin 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pin 12 | RB6 — Bidirectional I/O port B bit 6 |
| Pin 13 | RB7 — Bidirectional I/O port B bit 7 |
| Pin 14 | VDD — Positive supply voltage (3.0-6.25 V) |
| Pin 15 | OSC1/CLKIN — Oscillator crystal input / external clock in |
| Pin 16 | OSC2/CLKOUT — Oscillator crystal output / clock out |
| Pin 17 | RA0 — Bidirectional I/O port A bit 0 |
| Pin 18 | RA1 — Bidirectional I/O port A bit 1 |
Typical Applications
PIC16LC554T-04I/SO is suitable for 6 applications: Appliance Control (Washing Machine, Microwave, Fan), Security System Keypad and Sensor Interface, Low-End Consumer Electronics (Toy, Remote, Timer), Hobby and Educational MCU Projects, Simple Sensor Interface and Signal Conditioning, Industrial Sensor and Control Modules.
Appliance Control (Washing Machine, Microwave, Fan)
The PIC16LC554T-04I/SO is well-suited for major-appliance control boards where the firmware is finalized at production. Its 12 I/O pins can drive relay drivers, triac interfaces for AC loads, and read keypads/temperature sensors. The 3.0-6.25 V supply range allows direct operation from a 5 V regulator, while 80 B RAM and 896 B OTP are sufficient for state-machine based wash-cycle or cook-profile logic. The 4 MHz clock with 1 us instruction cycle delivers deterministic timing critical for zero-cross triac firing and sensor sampling. Watchdog timer prevents lockup in unattended operation.
Recommended
Security System Keypad and Sensor Interface
For PIR motion detectors, door/window sensors, and small alarm keypads, the PIC16LC554T-04I/SO provides a low-cost, low-power 8-bit control core. Its 12 I/O accommodates a 4x4 matrix keypad scan, piezo buzzer drive, LED indicators, and an RF or wired interface to a central panel. The deterministic single-cycle instruction set guarantees bounded response time for alarm-event signaling. Industrial -40C to +85C temperature grade ensures reliable operation in unheated garages or outdoor enclosures. OTP prevents field firmware tampering, a security advantage.
Recommended
Low-End Consumer Electronics (Toy, Remote, Timer)
Toy controllers, simple IR remote controls, kitchen timers, and novelty consumer devices benefit from the PIC16LC554T-04I/SO's sub-$2 cost in volume and 18-pin SOIC form factor. The 33-instruction baseline set is straightforward to hand-code in assembly for simple sequence logic, while the C compiler (XC8 free mode) supports small C projects within the 896 B OTP budget. The 3.0 V minimum supply permits 2-AA-battery operation through a low-drop regulator. Its deterministic interrupt response is well matched to IR frame timing in remote controls.
Recommended
Hobby and Educational MCU Projects
The PIC16LC554T-04I/SO is widely used in university embedded-systems courses and maker projects because of its simple baseline architecture and mature, free MPLAB X + XC8 toolchain. Students learn assembly programming on a 33-instruction RISC core, then graduate to C. The 18-pin SOIC is hand-solderable on breakout boards. The PICkit 3/4 programmer supports in-circuit serial programming on a breadboard. Industrial temperature grade lets student projects double as outdoor sensors. PIC microcontroller's huge codebase of community examples accelerates learning.
Recommended
Simple Sensor Interface and Signal Conditioning
For digital-output sensors (Hall-effect, PIR, reed switches, simple thermistor front-ends with external ADC), the PIC16LC554T-04I/SO provides threshold comparison, debouncing, and alarm-logic functions. The 12 I/O allow direct connection to multiple sensors and actuators without external mux logic. The 4 MHz clock supports software UART-style bit-banged serial output for sensor data reporting at low baud rates. The PIC16C5X's 2-level stack limits interrupt nesting but provides fully predictable response to sensor events.
Recommended
Industrial Sensor and Control Modules
Inside industrial control cabinets, the PIC16LC554T-04I/SO handles low-speed logic for relay sequencing, status-LED multiplexing, and Modbus-RTU slave interfaces at 9600 baud. The -40C to +85C industrial temperature range and 5 V supply compatibility suit factory-floor environments. The 80 B RAM is sufficient for a small RTU register file. The OTP memory prevents unauthorized firmware modification in fielded equipment. The 12-bit instruction width yields compact code, allowing complex protocol stacks in 896 B.
Recommended
Recommended Products Summary
Engineering reference data for PIC16LC554T-04I/SO — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | PIC16LC554T-04/SO | PIC16C554T-04I/SO | PIC16LC554T-04I/SS |
|---|---|---|---|---|
| Package | 18-SOIC | 18-SOIC | 18-SOIC | 20-SSOP |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory | 896 B OTP | 896 B OTP | 896 B OTP | 896 B OTP |
| Maximum Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage Range | 3.0 V to 6.25 V | 3.0 V to 6.25 V | 4.5 V to 5.5 V | 3.0 V to 6.25 V |
| Operating Temperature | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
| RAM Size | 80 B | 80 B | 80 B | 80 B |
| Number of I/O | 12 | 12 | 12 | 12 |
| Memory Type | OTP EPROM | OTP EPROM | OTP EPROM | OTP EPROM |
Key Differentiators
- Low-voltage 3.0 V minimum supply (vs PIC16C554T-04I/SO)
- Industrial temperature grade (vs PIC16LC554T-04/SO)
- Mature, deterministic baseline architecture (vs PIC16F505T-I/SL)
Design Notes
PIC16LC554T-04I/SO uses OTP (one-time programmable) EPROM, not Flash. Once programmed, the firmware cannot be erased or rewritten. Do not use this part for prototype or beta-stage designs where firmware iteration is expected. For development cycles, use the PIC16F505 or PIC16F506 Flash-based successor; once firmware is finalized, port the binary to PIC16LC554T-04I/SO for production cost reduction. Bypass VDD to VSS with a 100 nF ceramic capacitor placed within 5 mm of the supply pins.
The 'LC' low-voltage class requires only 3.0 V minimum supply, but operation at 3.0 V requires the 4 MHz internal oscillator configuration; at higher voltages (5 V nominal), more headroom is available. The MCLR reset pin must be tied to VDD through a 10 kohm pull-up resistor for normal operation; a momentary push-button to ground provides manual reset. Decoupling: place a 10 uF bulk electrolytic and a 100 nF ceramic across VDD-VSS near the MCU.
Keep the crystal or resonator traces short and symmetric; route OSC1 and OSC2 with equal length and guard-ground the area to reduce EMI coupling. Place the MCLR pull-up close to the MCU pin. Avoid running high-speed switching signals (relay coils, triac outputs) directly under the oscillator area. For 18-pin SOIC, hand-soldering is straightforward; for production, follow J-STD-020 MSL-1 floor-life guidelines (this part is moisture-insensitive).
Compliance Information
RoHS and lead-free compliant per Microchip product page; REACH compliance per EU regulation; conflict-minerals statement available from Microchip. Not AEC-Q100 qualified; not suitable for under-hood automotive applications.
