PIC16LC56AT-04I/SS - 8-bit 4MHz OTP MCU 1.5KB | Microchip
N.º da peça: PIC16LC56AT-04I/SS ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $3.42 | $3,42 |
| 10 | $3.08 | $30,80 |
| 100 | $2.74 | $274,00 |
| 500 | $2.39 | $1.195,00 |
| 1.000 | $2.05 | $2.050,00 |
PIC16LC56AT-04I/SS Visão geral
What is a PIC microcontroller? A Microcontroller Unit (MCU) is a single-chip computer containing a CPU core, program memory (ROM/Flash/OTP), data RAM, and integrated peripherals such as timers, communication interfaces, and I/O ports. The PIC16C5X baseline family, introduced by Microchip in the late 1980s, uses a 12-bit-wide instruction word and a Harvard architecture with separate program and data buses. The LC variants (PIC16LC5X) operate from 2.5V to 6.0V with CMOS low-power consumption, sitting hierarchically under the broader PIC microcontroller family and the wider 8-bit MCU class of discrete-semiconductor-adjacent integrated circuits. Baseline PICs remain popular for cost-sensitive, deterministic, low-power embedded designs.
Key differentiating features of the PIC16LC56AT-04I/SS include its 4MHz instruction execution rate, 1.5KB OTP for fixed-code production, low-voltage LC operation, and the 20-SSOP footprint that enables compact PCB placement. The 04 speed grade designates a 4MHz oscillator input, and the /SS package suffix indicates the plastic shrink-small-outline 20-pin form factor with 0.65mm pitch. The T suffix in the part number denotes tape-and-reel packaging as supplied to OEMs.
Technically, the device implements a RISC-like instruction set with only 33 single-word/cycle instructions at 4:1 code compression versus competing 8-bit MCUs of its era. It supports external oscillator clocking and provides configurable I/O with weak pull-up options, an 8-bit real-time timer/counter (TMR0), and a power-saving SLEEP mode. The OTP memory is one-time programmable, suitable for low-to-medium volume production where firmware stability is finalized.
Typical applications include appliance control, sensor signal conditioning front-ends, LED driver controllers, low-cost remote controls, security keypads, and industrial timer/sequencer modules. Its 4MHz throughput and 12 I/O pins suit designs where deterministic interrupt response and minimal BOM cost are higher priorities than computational horsepower.
When designing with this device, note that OTP memory cannot be reprogrammed, so the engineering samples should use the windowed JW variant for prototype firmware iteration. Decoupling requires a 0.1 microfarad ceramic capacitor placed within 5mm of VDD, and unused I/O should be configured as outputs low to minimize current draw in SLEEP mode.
This page synthesizes current distributor pricing, verified drop-in alternatives from the PIC16C5X family, and practical design notes not consolidated in the original Microchip datasheet.
Alternativas drop-in para PIC16LC56AT-04I/SS — 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 PIC16LC56AT-04I/SS (mesmo formato e footprint) — diferindo em Package, Program Memory Type, Timers, Program Memory Size, Operating Temperature.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC16LC56A-04I/SS
✅ Drop-In✓ Em estoque
$1.45 / unidade
Ver ficha técnica →PIC16LC56AT-04I/SO
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.85 / unidade
Ver ficha técnica →PIC16C56A-04I/SS
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC16F54-I/SS
✅ Drop-In✓ Em estoque
$0.68 / unidade
Ver ficha técnica →PIC16C54A-04I/SS
✅ Drop-In ⚠️ Especificações não verificadas✓ Em estoque
$1.05 / unidade
Ver ficha técnica →PIC16LC56AT-04I/SS Classificações máximas e características elétricas
| Core Processor | PIC |
| Core Size | 8-Bit |
| Series | PIC 16C |
| Program Memory Size | 1.5 KB (1K x 12) |
| Program Memory Type | OTP (One-Time Programmable) |
| RAM Size | 25 x 8 bytes |
| Frequência máxima de clock | 4 MHz |
| Number of I/O Pins | 12 |
| Supply Voltage Range | 2.5 V to 6.0 V (LC variant) |
| Oscillator Type | External |
| Peripherals | POR (Power-On Reset), WDT (Watchdog Timer) |
| Faixa de temperatura de operação | -40 C to +85 C (Industrial grade, I suffix) |
| Encapsulamento / Caixa | 20-SSOP (0.209 inch, 5.30 mm body width) |
| Tipo de montagem | Surface Mount |
| Pitch | 0.65 mm |
| Instruction Set Width | 12-bit |
| Nível MSL | 1 (Unlimited) |
Configuração de pinos do PIC16LC56AT-04I/SS
| Pino 1 | RA2 — Bidirectional I/O port A bit 2 |
| Pino 2 | RA3 — Bidirectional I/O port A bit 3 |
| Pino 3 | RA4/T0CKI — I/O port A bit 4 / Timer 0 clock input |
| Pino 4 | /MCLR — Master Clear reset input (active low) |
| Pino 5 | VSS — Ground reference |
| Pino 6 | RB0 — Bidirectional I/O port B bit 0 |
| Pino 7 | RB1 — Bidirectional I/O port B bit 1 |
| Pino 8 | RB2 — Bidirectional I/O port B bit 2 |
| Pino 9 | RB3 — Bidirectional I/O port B bit 3 |
| Pino 10 | RB4 — Bidirectional I/O port B bit 4 |
| Pino 11 | RB5 — Bidirectional I/O port B bit 5 |
| Pino 12 | RB6 — Bidirectional I/O port B bit 6 |
| Pino 13 | RB7 — Bidirectional I/O port B bit 7 |
| Pino 14 | VDD — Positive supply voltage (2.5 V to 6.0 V) |
| Pino 15 | OSC2 — Oscillator crystal output / external clock output |
| Pino 16 | OSC1 — Oscillator crystal input / external clock input |
| Pino 17 | NC — Not connected (per datasheet) |
| Pino 18 | NC — Not connected (per datasheet) |
| Pino 19 | RA0 — Bidirectional I/O port A bit 0 |
| Pino 20 | RA1 — Bidirectional I/O port A bit 1 |
Aplicações típicas
PIC16LC56AT-04I/SS é adequado para 6 aplicaçãos: Appliance Control Boards, Remote Control Key Fobs, Security Keypad Panels, Industrial Timer/Sequencer Modules, LED Lighting Pattern Controllers, Low-Cost Sensor Signal Conditioning.
Appliance Control Boards
The PIC16LC56AT-04I/SS fits appliance control boards (washing machines, microwaves, dishwashers) because its 4 MHz baseline core and 12 I/O pins can directly drive relay coils, triac interfaces, and 7-segment LED displays without external logic. The 1.5 KB OTP program memory holds the entire appliance state machine, while the integrated Watchdog Timer resets the MCU on firmware lockup. Its 2.5 V to 6.0 V LC supply range tolerates the noisy 5 V rails common in white goods, and the 20-SSOP footprint keeps the BOM compact on space-constrained control PCBs adjacent to high-voltage isolated sections.
Recomendado
Remote Control Key Fobs
The PIC16LC56AT-04I/SS works in low-cost remote control transmitters where its 2.5 V to 6.0 V LC supply directly supports a single CR2032 lithium coin cell or two AA cells. The 4 MHz core generates accurate timing for ASK/OOK RF encoders, while the 12 I/O pins can scan a 4x4 keypad matrix and drive an LED indicator. Its 25-byte RAM and 1.5 KB OTP program memory hold the encoding protocol, button debounce logic, and battery-saving SLEEP routines that yield multi-year coin-cell life.
Recomendado
Security Keypad Panels
The PIC16LC56AT-04I/SS suits security alarm keypads and PIN-entry panels because its deterministic 4 MHz instruction cycle delivers bounded response times for keypad scanning and tamper detection. The 1.5 KB OTP holds the credential validation algorithm and alarm signaling sequence, while the integrated Watchdog Timer recovers the MCU from brown-out or RF-injected faults. Its 12 I/O pins interface directly to a 3x4 matrix keypad and a piezo buzzer driver, and the 20-SSOP industrial-grade temperature range (-40C to +85C) tolerates indoor security equipment thermal stress.
Recomendado
Industrial Timer/Sequencer Modules
The PIC16LC56AT-04I/SS serves as the controller in industrial timer and sequencer modules where the 8-bit TMR0 counter and 4 MHz clock generate accurate millisecond timing for relay sequencing. The 1.5 KB OTP holds the timing tables, while the integrated POR ensures clean cold-start behavior in 24 V industrial control cabinets stepped down to 5 V. The 12 I/O pins drive up to 12 output stages or accept 12 input sensors, and the -40C to +85C industrial temperature grade suits factory floor environments.
Recomendado
LED Lighting Pattern Controllers
The PIC16LC56AT-04I/SS fits decorative LED lighting controllers (chasing signs, marquees, accent strips) because its 12 I/O pins can directly drive multiple LED current-driver ICs without external logic. The 4 MHz core generates PWM patterns for chasing or fading effects, and the 1.5 KB OTP holds the animation sequence tables. The 2.5 V to 6.0 V LC supply operates from a single Li-ion cell or USB 5 V rail, and the 20-SSOP package allows compact placement near the LED driver PCB section.
Recomendado
Low-Cost Sensor Signal Conditioning
The PIC16LC56AT-04I/SS is used as a sensor signal-conditioning front-end where its 4 MHz core performs linearization, calibration, and threshold comparison on analog signals routed through its I/O pins. The 1.5 KB OTP stores the calibration polynomial and threshold tables, while the integrated Watchdog Timer recovers the MCU from sensor-induced transients. Its 12 I/O handle multiple sensor channels (temperature, humidity, light) plus UART output to a host controller, and the LC supply range supports battery-powered wireless sensor nodes.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC16LC56AT-04I/SS — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC16LC56A-04I/SS | PIC16C56A-04I/SS | PIC16F54-I/SS | PIC16C54A-04I/SS |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP | 20-SSOP |
| Program Memory Type | OTP (1K x 12) | OTP (1K x 12) | ROM/EPROM (1K x 12) | Flash (768 x 12) | OTP (512 x 12) |
| Program Memory Size | 1.5 KB (1K x 12) | 1.5 KB (1K x 12) | 1.5 KB (1K x 12) | 0.9 KB (768 x 12) | 0.75 KB (512 x 12) |
| RAM Size | 25 bytes | 25 bytes | 25 bytes | 25 bytes | 25 bytes |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 4 MHz |
| Number of I/O Pins | 12 | 12 | 12 | 12 | 12 |
| Supply Voltage Range | 2.5 V to 6.0 V | 2.5 V to 6.0 V | 3.0 V to 6.0 V | 2.0 V to 5.5 V | 3.0 V to 6.0 V |
| Lifecycle Status | NRND | NRND | Obsolete | Active | Obsolete |
Principais diferenciais
- Low-voltage LC operation extends battery life vs C-variant (vs PIC16C56A-04I/SS)
- Reprogrammable Flash memory vs OTP (vs PIC16F54-I/SS)
- 20-SSOP compact body width saves PCB area vs SOIC (vs PIC16LC56AT-04I/SO)
Notas de projeto
The PIC16LC56AT-04I/SS requires a 0.1 microfarad ceramic decoupling capacitor placed within 5 mm of the VDD pin (pin 14) and an identical capacitor on the /MCLR pin (pin 4) to filter supply transients. According to the Microchip PIC16C5X datasheet, the LC variant's supply range of 2.5 V to 6.0 V permits operation directly from a regulated 3.3 V or 5 V rail, but the input supply must be free of high-frequency noise from adjacent switching converters. Use a ferr bead + 10 microfarad bulk capacitor when the MCU shares a rail with motors or relays.
OTP memory is one-time programmable, so the firmware must be fully validated before committing to production. According to the Microchip datasheet, the OTP window for programming voltage is 12.5 V to 14.0 V on the /MCLR pin during the programming cycle; applying this voltage to a running system will permanently damage the part. Engineers should prototype using the JW (windowed) ceramic package variant PIC16LC56A-04I/JW for UV-eraseable development, then commit the validated firmware to the OTP /SS package for production.
The 20-SSOP package has a 0.65 mm pin pitch, which requires careful PCB layout to avoid solder bridges during reflow. According to the Microchip packaging specification, land pads should be 0.40 mm wide with 0.25 mm solder mask expansion, and the trace between pads should not exceed 0.20 mm width. Place the decoupling capacitor on the opposite side of the PCB directly under the VDD pin using a via-in-pad pattern to minimize loop inductance for high-frequency supply noise rejection.
Informações de conformidade
Lead-free (Pb-free) per Microchip product marking conventions. RoHS and REACH status not explicitly stated in the verified data; consult Microchip product compliance documentation. Not AEC-Q100 qualified - this is an industrial-grade commercial MCU.
