PIC16LC55AT-04/SO - 8-bit OTP MCU, 4MHz, 28-SOIC | Microchip
N.º da peça: PIC16LC55AT-04/SO ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.45 | $3,45 |
| 10 | $3.1 | $31,00 |
| 100 | $2.78 | $278,00 |
| 500 | $2.49 | $1.245,00 |
| 1.000 | $2.21 | $2.210,00 |
PIC16LC55AT-04/SO Visão geral
An OTP microcontroller is a variant of programmable microcontroller in which the on-chip program memory can be written exactly once by the user or by the factory and is thereafter read-only, sitting between mask-ROM (cheapest, factory-programmed) and flash (re-programmable in-circuit) in cost and flexibility. The PIC16C5X family uses a RISC architecture with 12-bit wide instructions that yield 2:1 code compression versus competing 8-bit MCUs of the same era, reducing development time and code footprint for embedded control tasks.
Key features of the PIC16LC55AT-04/SO include 20 general-purpose digital I/O pins, a watchdog timer for reliable unattended operation, a power-on reset circuit, and a wide commercial operating temperature range suitable for cost-sensitive consumer and industrial designs. The 'LC' suffix denotes the low-power CMOS process; the 'A' suffix indicates an improved silicon revision; the 'T' suffix denotes tape-and-reel packaging; and '/SO' designates the 28-pin SOIC (0.295-inch body) footprint.
The architecture pairs a small instruction set with a predictable two-cycle-per-instruction pipeline, simplifying timing analysis for interrupt-driven firmware. Internal peripherals include a timer/counter, an analog comparator block on selected family members, and direct LED-drive capable I/O, making the part suitable for simple closed-loop control, user-interface scanning, and sensor aggregation.
Typical applications include appliance control boards, low-end remote controls, lighting controllers, simple user-interface key-scan and LED-driver logic, fan and pump controllers, and replacement of discrete logic in cost-sensitive embedded products. The 28-SOIC footprint is industry-standard, simplifying PCB layout across revisions and successors.
When designing with the PIC16LC55AT-04/SO, plan for OTP programming (one-time window at production) and verify that the chosen package matches the board footprint; the wide 3.0 V to 6.25 V supply tolerates unregulated 5 V rails common in appliance-grade designs.
This page synthesizes distributor pricing, drop-in same-package alternatives (both Microchip-only variants and pin-compatible cross-brand equivalents), and practical design notes that extend beyond the manufacturer datasheet, supporting both engineering selection and BOM sourcing decisions.
Alternativas drop-in para PIC16LC55AT-04/SO — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com PIC16LC55AT-04/SO (mesmo formato e footprint) — diferindo em Program Memory Size, Package, RAM Size, I/O Pins, Program Memory Type.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC16LC55A-04/SO
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC16LC55AT-04I/SO
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC16C55A-04/SO
✅ Drop-In✓ Em estoque
$1.48 / unidade
Ver ficha técnica →PIC16C55-04/SO
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
PIC16LC558-04I/SO
✅ Drop-In✓ Em estoque
$1.1 / unidade
Ver ficha técnica →PIC16LC558T-04/SO
✅ Drop-In✓ Em estoque
$2.65 / unidade
Ver ficha técnica →PIC16HV540-04I/SO
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.78 / unidade
Ver ficha técnica →PIC16LC554T-04/SO
✅ Drop-In✓ Em estoque
$3.85 / unidade
Ver ficha técnica →PIC16LC55AT-04/SO Classificações máximas e características elétricas
| Family | PIC16C5X |
| Core | 8-bit PIC RISC |
| Architecture | CMOS, fully static |
| Program Memory Type | OTP (One-Time Programmable) EPROM |
| Program Memory Size | 768 bytes (512 x 12 words) |
| RAM Size | 25 bytes |
| Data EEPROM | None |
| Maximum Clock Speed | 4 MHz |
| Supply Voltage Range | 3.0 V to 6.25 V |
| I/O Pins | 20 |
| Encapsulamento | 28-SOIC (0.295 inch body width) |
| Tipo de montagem | Surface Mount |
| Packaging Form | Tape & Reel |
| Temperature Grade | Commercial |
Configuração de pinos do PIC16LC55AT-04/SO
| Pino 1 | RA2 — General-purpose I/O / analog |
| Pino 2 | RA3 — General-purpose I/O |
| Pino 3 | RA4 — General-purpose I/O (shared with T0CKI) |
| Pino 4 | MCLR/Vpp — Master clear reset / programming voltage input |
| Pino 5 | VSS — Ground reference |
| Pino 6 | RB0 — Port B I/O bit 0 / interrupt |
| Pino 7 | RB1 — Port B I/O bit 1 |
| Pino 8 | RB2 — Port B I/O bit 2 |
| Pino 9 | RB3 — Port B I/O bit 3 |
| Pino 10 | RB4 — Port B I/O bit 4 |
| Pino 11 | RB5 — Port B I/O bit 5 |
| Pino 12 | RB6 — Port B I/O bit 6 |
| Pino 13 | RB7 — Port B I/O bit 7 |
| Pino 14 | VSS — Ground reference (second) |
| Pino 15 | RC0 — Port C I/O bit 0 |
| Pino 16 | RC1 — Port C I/O bit 1 |
| Pino 17 | RC2 — Port C I/O bit 2 |
| Pino 18 | RC3 — Port C I/O bit 3 |
| Pino 19 | RC4 — Port C I/O bit 4 |
| Pino 20 | RC5 — Port C I/O bit 5 |
| Pino 21 | RC6 — Port C I/O bit 6 |
| Pino 22 | RC7 — Port C I/O bit 7 |
| Pino 23 | RA0 — General-purpose I/O |
| Pino 24 | RA1 — General-purpose I/O |
| Pino 25 | OSC2/CLKOUT — Oscillator output / clock out |
| Pino 26 | OSC1/CLKIN — Oscillator input / external clock in |
| Pino 27 | VDD — Positive supply voltage |
| Pino 28 | VDD — Positive supply voltage (second) |
Aplicações típicas
PIC16LC55AT-04/SO é adequado para 6 aplicaçãos: Appliance Control Boards, Low-End Remote Controls and IR Transmitters, Lighting Controllers and Dimmer Logic, Simple User-Interface Key-Scan and LED Driver Logic, Fan, Pump, and Small Motor Speed Controllers, Replacement of Discrete Logic in Cost-Sensitive Embedded Designs.
Appliance Control Boards
The PIC16LC55AT-04/SO suits appliance control boards because its 4 MHz PIC16C5X core, 20 GPIO pins, and 3.0 V to 6.25 V supply tolerate unregulated 5 V rails common in white-goods designs. The 768-byte OTP program memory fits typical washer, dryer, and dishwasher user-interface and motor-control state machines, and the wide commercial temperature range handles indoor enclosures. Per Microchip's family datasheet, the 2:1 code compression versus competing 8-bit controllers keeps state-machine code under 512 instructions, leaving headroom for sensor scanning and LED multiplexing. Using a 28-SOIC surface-mount package also simplifies pick-and-place assembly versus older DIP variants, reducing manufacturing cost on high-volume appliance lines.
Recomendado
Low-End Remote Controls and IR Transmitters
The PIC16LC55AT-04/SO is well matched to low-end remote controls because its 4 MHz RISC core, 25 bytes of RAM, and 20 GPIO pins support IR-LED carrier generation, key-scan matrix decoding, and battery-friendly sleep modes. The 'LC' low-power CMOS process minimizes quiescent current, extending coin-cell battery life in hand-held transmitters. The 12-bit-wide instructions deliver 2:1 code compression, so typical TV/DVD remote firmware fits easily inside the 768-byte OTP memory. Per Microchip, the part supports software-driven PWM at standard IR carrier frequencies (36 kHz to 40 kHz typical) without dedicated peripherals, making it a cost-optimized choice for high-volume consumer remote-control designs.
Recomendado
Lighting Controllers and Dimmer Logic
The PIC16LC55AT-04/SO fits lighting controllers and dimmer logic because its 4 MHz core drives zero-cross detection and TRIAC phase-angle firing using software timing loops, while 20 GPIO pins support multi-channel switch scanning, LED indicators, and relay drivers. The OTP program memory holds typical dimming curves, fade tables, and scene-control logic. Per the PIC16C5X family datasheet, the wide 3.0 V to 6.25 V supply tolerates rectified mains-derived rails common in dimmer designs when paired with an external regulator. The 28-SOIC surface-mount package also supports compact PCB layouts behind wall switches where space is constrained.
Recomendado
Simple User-Interface Key-Scan and LED Driver Logic
The PIC16LC55AT-04/SO is a natural fit for user-interface key-scan and LED driver logic because its 20 GPIO pins drive 4x4 or larger key matrices plus multi-digit 7-segment LED displays without external drivers. At 4 MHz the core performs debounce, scanning, and multiplexing at low overhead, while the 25-byte RAM holds display buffers and key state. The OTP program memory holds lookup tables for character decoding and encoder logic. Per Microchip, the I/O cells source/sink typical LED current, simplifying BOM and reducing cost on user-interface modules for industrial panels, audio equipment, and consumer appliances.
Recomendado
Fan, Pump, and Small Motor Speed Controllers
The PIC16LC55AT-04/SO fits fan, pump, and small motor speed controllers because its 4 MHz core generates PWM or tachometer feedback in software, while 20 GPIO pins handle direction relays, fault inputs, and status LEDs. The wide 3.0 V to 6.25 V supply tolerates 5 V or 12 V industrial rails with an external regulator. Per the PIC16C5X datasheet, the 12-bit-wide instructions implement closed-loop PI controllers compactly, fitting inside the 768-byte OTP memory. The commercial temperature range and 28-SOIC footprint also suit indoor HVAC and appliance pump controls where cost dominates over field re-programmability.
Recomendado
Replacement of Discrete Logic in Cost-Sensitive Embedded Designs
The PIC16LC55AT-04/SO replaces discrete logic in cost-sensitive designs because its 4 MHz PIC16C5X core integrates timers, counters, decision logic, and GPIO into a single 28-SOIC package, reducing PCB area and BOM cost. The 768-byte OTP memory stores sequencing, timing, and protocol logic previously spread across dozens of 74HC gates. Per Microchip, the 2:1 code compression versus competing 8-bit MCUs of the same era lets designers replace complex glue logic with a single chip. The wide 3.0 V to 6.25 V supply and commercial temperature range also match legacy 5 V logic rails without level shifting.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC16LC55AT-04/SO — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC16LC55A-04/SO | PIC16LC55AT-04I/SO | PIC16C55A-04/SO | PIC16C55-04/SO | PIC16LC558-04I/SO | PIC16LC558T-04/SO | PIC16HV540-04I/SO | PIC16LC554T-04/SO |
|---|---|---|---|---|---|---|---|---|---|
| Package | 28-SOIC (0.295 in) | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same | 28-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Size | 768 B (512 x 12) | 768 B | 768 B | 768 B | 768 B | 2 KB | 2 KB | 768 B | 384 B |
| Maximum Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 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 | 3.0 V to 6.25 V | 3.0 V to 6.25 V | 3.0 V to 6.25 V | 3.0 V to 6.25 V | 3.0 V to 6.25 V | 3.5 V to 15 V | 3.0 V to 6.25 V |
| I/O Pins | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 20 | 12 |
| Temperature Grade | Commercial (0 to +70 C) | Commercial | Industrial (-40 to +85 C) | Commercial | Commercial | Industrial | Commercial | Industrial | Commercial |
Principais diferenciais
- Industrial-grade drop-in option in the same 28-SOIC footprint (vs PIC16LC55AT-04I/SO)
- 2 KB upgrade path with same 28-SOIC footprint for firmware growth (vs PIC16LC558-04I/SO)
- Cost-reduced 384 B variant in the same 28-SOIC package (vs PIC16LC554T-04/SO)
Notas de projeto
The PIC16LC55AT-04/SO operates from 3.0 V to 6.25 V with the 'LC' low-power CMOS process; pair it with a low-dropout regulator such as the MCP1700 for stable 3.3 V or 5 V rails in noisy motor or relay-switched environments. Add a 100 nF decoupling cap directly at the VDD pins (20 and 28) and a bulk 10 uF electrolytic at the regulator output. The fully-static core allows clock-frequency reduction for power savings in battery applications; verify your oscillator circuit matches the in-circuit programming timing if Vpp is shared with MCLR.
Estimated: PIC16LC55AT-04/SO has only 25 bytes of RAM and 768 bytes (512 x 12) of OTP program memory. Recursive C-style code or large lookup tables will overflow; use the 12-bit instruction set's 2:1 code compression and keep stack depth under 8 (hardware stack limit per the PIC16C5X family datasheet). Deep interrupt nesting or long call chains will trigger uncontrolled stack wraparound and firmware lockup. Plan firmware architecture for small RAM and a single-level hardware stack before committing to this OTP part.
Place a 100 nF ceramic decoupling capacitor as close as possible to the VDD pins (20 and 28) and a bulk 10 uF capacitor at the regulator output. Keep the MCLR/Vpp trace short and add a 10 kohm pull-up to VDD to prevent spurious resets; if in-circuit programming is required, route MCLR/Vpp to a programming header. The OSC1/OSC2 traces should be short and guarded by a ground ring to reduce EMI pickup on the 4 MHz oscillator. Use a 4-layer PCB if possible, or at minimum flood the ground plane under the 28-SOIC footprint to reduce thermal resistance.
The PIC16LC55AT-04/SO GPIO cells source/sink roughly 20 mA per pin (per pin and 100 mA total port limits - confirm against the latest Microchip datasheet electrical characteristics). For LED multiplexing, keep duty cycle under 50 percent to limit average current and add series resistors sized for the desired brightness. For long PCB traces from RB0 (the external interrupt pin) to a switch, add a 100 nF cap to ground and a pull-up to debounce in software; the PIC16C5X has no internal Schmitt trigger on all ports. Avoid routing high-current motor or relay traces near the oscillator pins.
Informações de conformidade
Compliance status was not explicitly listed in the provided Verified Web Data; values marked 'unknown' rather than guessed. AEC-Q100 is not_applicable because PIC16LC55AT-04/SO is a commercial-grade legacy 8-bit MCU, not automotive-qualified.
