PIC16LC74A-04/PT - 4MHz 8-bit MCU 7KB OTP 44-TQFP | Microchip
N.º da peça: PIC16LC74A-04/PT ✗ Fim de vida| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $5.02 | $5,02 |
| 10 | $4.85 | $48,50 |
| 100 | $4.5 | $450,00 |
| 500 | $4.1 | $2.050,00 |
| 1.000 | $3.75 | $3.750,00 |
PIC16LC74A-04/PT Visão geral
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and peripheral interfaces onto one silicon die. The PIC16LC7x family belongs to the broader 8-bit microcontroller category, which sits below 32-bit microcontrollers and microprocessors in the silicon hierarchy. PIC16 mid-range devices are known for their deterministic 35-instruction RISC architecture, simple in-circuit programming, and rich peripheral integration that makes them well-suited for control-oriented embedded designs.
Key features include 192 bytes of data RAM, 33 bidirectional I/O pins multiplexed with peripheral functions, an integrated 8-channel 8-bit Analog-to-Digital Converter (ADC), two Capture/Compare/PWM modules, a USART with addressable Receive/Transmit buffers, and a Synchronous Serial Port (SSP) that supports SPI and I2C master/slave operation. The part also provides two 8-bit timers plus one 16-bit timer, a watchdog timer with its own on-chip RC oscillator, and brown-out reset for supply monitoring. The integrated analog and digital peripherals let a single chip replace several discrete components in a control loop.
Technically, the PIC16LC74A uses a 14-bit instruction set with a 2-stage pipeline and an 8-bit data path; OTP program memory is programmed once via ICSP. The device runs from 2.5 V to 6.0 V, has a maximum CPU speed of 4 MHz, and includes low-power SLEEP and brown-out reset for energy-constrained designs. Compared with flash-based PIC16F siblings, OTP variants are typically used in mature, cost-sensitive volume production where reprogrammability in-circuit is no longer needed.
Typical applications include industrial instrumentation front ends, consumer appliance control boards, motor control with PWM, sensor-conditioning front-ends feeding the on-chip ADC, simple human-machine interface panels, and low-cost data-acquisition modules. The 33 I/O pins and the integrated peripherals also make it useful as a peripheral controller alongside a higher-end host processor in distributed embedded systems.
When designing with the PIC16LC74A-04/PT, note that OTP memory cannot be erased and rewritten - production code must be final before programming. Plan the in-circuit serial programming (ICSP) header and decoupling early; a 100 nF decoupling capacitor on each supply pin and a bulk 10 uF cap near VDD are typical starting values for the 44-TQFP land pattern.
This page combines verified-portrait distributor pricing, cross-referenced drop-in alternatives, and practical design notes to help engineers select the PIC16LC74A-04/PT quickly.
Alternativas drop-in para PIC16LC74A-04/PT — 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 PIC16LC74A-04/PT (mesmo formato e footprint) — diferindo em Package, Timers, Watchdog Timer, Program Memory Type, ADC.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
PIC16F74A-I/PT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC16LF74-I/PT
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
PIC16F747-I/PT
✅ Drop-In✓ Em estoque
$4.4 / unidade
Ver ficha técnica →PIC16F914-I/PT
✅ Drop-In✓ Em estoque
$2.98 / unidade
Ver ficha técnica →PIC16LC74A-04/PQ
✅ Drop-In✓ Em estoque
$2.43 / unidade
Ver ficha técnica →PIC16LC65A-04I/PQ
✅ Drop-In✓ Em estoque
$5.3 / unidade
Ver ficha técnica →PIC16LC74A-04/PT Classificações máximas e características elétricas
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| CPU Speed | 4 MHz |
| Data RAM | 192 bytes |
| I/O Pins | 33 |
| ADC | 8 channels x 8-bit (per family datasheet) |
| Timers | Two 8-bit + one 16-bit |
| Capture/Compare/PWM | 2 modules (per family datasheet) |
| Serial Interfaces | USART, SSP (SPI/I2C) |
| Watchdog Timer | Yes (with dedicated on-chip RC) |
| Brown-out Reset | Yes |
| Temperatura de operação | 0C to +70C (per Jotrin listing) |
| Encapsulamento | 44-pin TQFP (PT) |
| Tipo de montagem | Surface Mount (Gull-Wing) |
| Architecture | 8-bit PIC16C mid-range, 14-bit instruction, 2-stage pipeline |
Configuração de pinos do PIC16LC74A-04/PT
| Pino 1 | OSC1/CLKIN — Oscillator input / external clock |
| Pino 2 | RA0/AN0 — PORTA bit 0 / ADC input 0 |
| Pino 3 | RA1/AN1 — PORTA bit 1 / ADC input 1 |
| Pino 4 | RA2/AN2 — PORTA bit 2 / ADC input 2 |
| Pino 5 | RA3/AN3/VREF0 — PORTA bit 3 / ADC input 3 / ADC VREF |
| Pino 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pino 7 | RA5/AN4/SS — PORTA bit 5 / ADC input 4 / SPI slave select |
| Pino 8 | VSS — Ground reference |
| Pino 9 | OSC2/CLKOUT — Oscillator output / clock out |
| Pino 10 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator out / Timer1 clock |
| Pino 11 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator in / CCP2 |
| Pino 12 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM1 |
| Pino 13 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pino 14 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pino 15 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pino 16 | RC6/TX/CK — PORTC bit 6 / USART TX / clock |
| Pino 17 | RC7/RX/DT — PORTC bit 7 / USART RX / data |
| Pino 18 | VSS — Ground reference |
| Pino 19 | RD0/PSP0 — PORTD bit 0 / Parallel Slave Port bit 0 |
| Pino 20 | RD1/PSP1 — PORTD bit 1 / Parallel Slave Port bit 1 |
| Pino 21 | RD2/PSP2 — PORTD bit 2 / Parallel Slave Port bit 2 |
| Pino 22 | RD3/PSP3 — PORTD bit 3 / Parallel Slave Port bit 3 |
| Pino 23 | RC4/PSP4 — PORTD bit 4 / Parallel Slave Port bit 4 |
| Pino 24 | RD5/PSP5 — PORTD bit 5 / Parallel Slave Port bit 5 |
| Pino 25 | RD6/PSP6 — PORTD bit 6 / Parallel Slave Port bit 6 |
| Pino 26 | RD7/PSP7 — PORTD bit 7 / Parallel Slave Port bit 7 |
| Pino 27 | VSS — Ground reference |
| Pino 28 | VDD — Positive supply voltage |
| Pino 29 | RB0/INT — PORTB bit 0 / external interrupt |
| Pino 30 | RB1 — PORTB bit 1 |
| Pino 31 | RB2 — PORTB bit 2 |
| Pino 32 | RB3 — PORTB bit 3 |
| Pino 33 | RB4 — PORTB bit 4 |
| Pino 34 | RB5 — PORTB bit 5 |
| Pino 35 | RB6/PGC — PORTB bit 6 / ICSP clock |
| Pino 36 | RB7/PGD — PORTB bit 7 / ICSP data |
| Pino 37 | VSS — Ground reference |
| Pino 38 | AVDD — Analog positive supply voltage |
| Pino 39 | AVSS — Analog ground reference |
| Pino 40 | RE0/RD/AN5 — PORTE bit 0 / RD control / ADC input 5 |
| Pino 41 | RE1/WR/AN6 — PORTE bit 1 / WR control / ADC input 6 |
| Pino 42 | RE2/CS/AN7 — PORTE bit 2 / CS control / ADC input 7 |
| Pino 43 | VDD — Positive supply voltage |
| Pino 44 | MCLR/VPP — Master clear reset / programming voltage |
Aplicações típicas
PIC16LC74A-04/PT é adequado para 6 aplicaçãos: Industrial Instrumentation Front-End, Consumer Appliance Control Board, Motor Control with PWM, Sensor Conditioning Front-End, Human-Machine Interface (HMI) Panels, Low-Cost Data Acquisition Module.
Industrial Instrumentation Front-End
The PIC16LC74A-04/PT is a strong fit for industrial instrumentation front-ends that need 8 analog inputs and 33 I/O. The integrated 8-channel 8-bit ADC (per the PIC16C7X family datasheet) digitizes sensor signals directly without an external ADC, and the 33 I/O drive status LEDs, keypads, and 7-segment displays. Its 4 MHz CPU is sufficient for slow control loops such as temperature, pressure, and flow monitoring, and the brown-out reset prevents data corruption during supply dips in factory environments.
Recomendado
Consumer Appliance Control Board
Consumer appliance controllers - washing machines, dishwashers, microwave ovens, and rice cookers - benefit from the PIC16LC74A-04/PT's 7 KB OTP memory (per the PIC16C7X datasheet) and integrated peripherals. The Capture/Compare/PWM module drives TRIACs and relays directly, the USART links to a panel indicator or inverter board, and the SSP supports I2C links to EEPROM or temperature sensors. OTP memory is ideal here because the appliance firmware is fully validated and never re-programmed in the field, keeping unit cost low.
Recomendado
Motor Control with PWM
Brush-DC and small BLDC motor controllers are a sweet spot for the PIC16LC74A-04/PT, because the PIC16C7X family provides two CCP modules capable of producing 10-bit PWM (per the family datasheet) and a 16-bit timer for precise period control. The 33 I/O drive Hall-effect sensors, gate drivers, and fault inputs. The 4 MHz CPU is fast enough for commutation at modest RPM, and OTP memory locks the validated control firmware at production. Industrial temperature variants may require a PIC16F74A-I/PT substitute.
Recomendado
Sensor Conditioning Front-End
Multi-channel sensor-conditioning boards for HVAC, agriculture, and environmental monitoring use the PIC16LC74A-04/PT as a front-end digitizer. The 8-channel 8-bit ADC (per the PIC16C7X datasheet) reads thermocouples amplified by op-amps, soil-moisture probes, and gas sensors, while the I2C/SPI SSP port connects to an external higher-resolution ADC for precision channels. With 192 bytes of RAM and 7 KB OTP for lookup-table linearization, the part easily runs sensor-fusion algorithms in slow control loops.
Recomendado
Human-Machine Interface (HMI) Panels
Cost-sensitive HMI panels with 4x4 keypads, 7-segment displays, and status LEDs are well served by the PIC16LC74A-04/PT. With 33 I/O, the MCU scans a 4x4 matrix directly, multiplexes 4-6 seven-segment digits, and drives indicator LEDs without additional logic. The USART links to a host PLC or inverter, and OTP memory keeps the BOM cost low. For richer graphics, designers migrate to the PIC16F914-I/PT, which integrates an LCD driver in the same 44-pin TQFP footprint.
Recomendado
Low-Cost Data Acquisition Module
Distributed data-acquisition modules in industrial networks use the PIC16LC74A-04/PT for its integrated peripherals and low BOM cost. The USART/SSP communicates with the host PLC via RS-485 transceivers, the ADC samples analog or remote inputs, and the CCP modules generate timing pulses for synchronized sampling. OTP memory locks the validated acquisition firmware. The part is a predecessor of the modern PIC16F74A-I/PT, sharing peripheral function set but adding flash and a 20 MHz CPU in the same TQFP-44 footprint.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para PIC16LC74A-04/PT — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | PIC16F74A-I/PT | PIC16LF74-I/PT | PIC16F747-I/PT | PIC16F914-I/PT |
|---|---|---|---|---|---|
| Package | 44-pin TQFP (PT) | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same | 44-pin TQFP (PT) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory Type | OTP | Flash | Flash | Flash | Flash |
| Program Memory Size | 7 KB (4K x 14) | 7 KB | 7 KB | 7 KB | 14 KB |
| CPU Speed | 4 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 256 bytes | 352 bytes |
| I/O Pins | 33 | 33 | 33 | 36 | 36 |
| Operating Temperature | 0C to +70C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Lifecycle Status | Obsolete | Active | Active | Active | Active |
Principais diferenciais
- OTP memory locks validated firmware at production (vs PIC16F74A-I/PT)
- Same 44-pin TQFP footprint as flash siblings (vs PIC16LF74-I/PT)
- Mature mid-range peripheral set (vs PIC16F747-I/PT)
Notas de projeto
OTP memory cannot be erased or rewritten - once programmed, the PIC16LC74A-04/PT is locked to that code. Validate firmware on a PIC16F74A-I/PT equivalent before committing to OTP production. Use Microchip's ICSP header and keep MCLR/VPP accessible for programming; do not put low-ESR caps directly on the MCLR pin without a series resistor for in-circuit programming.
Place a 100 nF decoupling capacitor on each VDD/AVDD pair as close to the pins as possible, with a bulk 10 uF tantalum or ceramic near the supply entry. The 44-pin TQFP has multiple VDD pins (digital and analog) that all need decoupling per the PIC16C7X datasheet. Estimated: at 4 MHz and 5 V, VDD current draw is typically 5-10 mA active plus ADC reference draw; size the bulk cap accordingly for transient loads.
The 44-pin TQFP has a junction-to-ambient thermal resistance of approximately 50-60 C/W (per typical Microchip TQFP data). At 4 MHz, 5 V, and 10 mA active, power dissipation is roughly 50 mW, yielding a junction rise of only 3 C above ambient - well within the 0C to +70C commercial range. In a sealed enclosure with no airflow, derate by 20% to keep Tj below 70 C over the full operating range.
The 44-pin TQFP has a 0.8 mm lead pitch - use a PCB land pattern that follows IPC-7351 nominal density (per JEDEC MO-153). Keep analog and digital ground planes separated, joining at a single point near the AVSS pin. Route the 4 MHz crystal traces short and guard them with a ground ring; place C1/C2 load caps within 2 mm of OSC1/OSC2 to avoid clock jitter and EMI.
Informações de conformidade
Compliance information not present in the verified distributor data; RoHS/REACH status was not listed by Mouser, DigiKey, or Seekic. As an obsolete Microchip part produced before the 2010 RoHS transition, legacy PIC16LC74A stock may be non-RoHS; verify with the distributor before shipping to EU markets.