PIC16LC74A-04I/PQ - 8-Bit 4MHz CMOS MCU | Microchip
N.º de pieza: PIC16LC74A-04I/PQ ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $9.45 | $9,45 |
| 10 | $8.55 | $85,50 |
| 100 | $7.1 | $710,00 |
| 500 | $5.95 | $2.975,00 |
| 1.000 | $5.1 | $5.100,00 |
PIC16LC74A-04I/PQ Descripción general
What is an OTP microcontroller? An OTP (One-Time-Programmable) microcontroller is a programmable IC whose on-chip program memory can be written exactly once after manufacture using a programming device. Unlike Flash-based MCUs (such as the PIC16F family) that allow in-circuit re-programming, OTP variants are optimized for cost-sensitive production runs where firmware is final and will never be updated in the field. The PIC16LC7x sits in Microchip's PIC16C mid-range architecture family - a RISC Harvard-architecture 8-bit core with 14-bit instruction words - bridging simple 8-bit controllers and more capable 16-bit PICs.
Key features include an operating voltage range of 3.0V to 6.0V (the 'LC' prefix denotes the low-voltage CMOS variant), 5 mA typical operating current at 4 MHz/5V, an internal watchdog timer with on-chip RC oscillator for safe recovery from code lockups, and a power-on reset (POR) plus brown-out reset (BOR) circuit for reliable supply supervision.
The 44-pin MQFP package is the largest MPN in the PIC16C7x family, providing dedicated pins for parallel port expansion, multiple interrupt sources, and an external memory interface. The 33 I/O pins can drive LEDs, keypads, character LCDs, and small relays directly through current-limited outputs.
Typical applications include industrial control boards, appliance user interfaces, security and alarm panels, automotive body electronics, sensor conditioning front-ends, and low-cost embedded products where OTP cost savings outweigh the need for field re-programmability. The integrated ADC makes it suitable for direct thermistor, potentiometer, and transducer signal acquisition.
When designing with this MPN, allocate board space for an in-system programming header if you plan to use a compatible Flash sibling (PIC16F74) during development - the pinout is identical so the same PCB can host either OTP (production) or Flash (prototype) parts. The PQ suffix denotes the Metric QFP tray package; the industrial (-I) suffix guarantees -40C to +85C operation.
This page consolidates distributor pricing, drop-in pin-compatible substitutes, and practical layout notes for the PIC16LC74A-04I/PQ that supplement the original Microchip datasheet, helping engineers validate the part for legacy designs and production runs.
Alternativas directas para PIC16LC74A-04I/PQ — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con PIC16LC74A-04I/PQ (mismo factor de forma y huella) — difiere en Package, Program Memory Size, Timers, A/D Converter, Core Architecture.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC16LC74A-04/PQ
✅ Sustitución directa✓ En stock
$2.43 / unidad
Ver hoja de datos →PIC16LC74AT-04I/PQ
✅ Sustitución directa✓ En stock
$5.95 / unidad
Ver hoja de datos →PIC16LC74B-04I/PQ
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$7.6 / unidad
Ver hoja de datos →PIC16F74-I/PQ
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PIC16F74A-I/PQ
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
PIC16C74A-04E/PQ
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$6.2 / unidad
Ver hoja de datos →PIC16C74B-04E/PQ
✅ Sustitución directa ⚠️ Especificaciones sin verificar✓ En stock
$9.95 / unidad
Ver hoja de datos →PIC16LC74A-04I/PQ Valores máximos y características eléctricas
| Core Architecture | PIC16C RISC, 8-bit, 14-bit instructions |
| Family | PIC16C7x mid-range |
| Program Memory Type | OTP (One-Time-Programmable) |
| Program Memory Size | 7 KB (4K x 14 words) |
| RAM Size | 192 bytes |
| Frecuencia de reloj máxima | 4 MHz |
| Operating Voltage Range | 3.0 V to 6.0 V |
| I/O Pin Count | 33 |
| ADC | 8 channels, 8-bit |
| Timers | 2 x 8-bit Timer0/Timer2, 1 x 16-bit Timer1 |
| Capture/Compare/PWM (CCP) | 1 module |
| Serial Interfaces | USART/SCI, SSP (SPI / I2C) |
| Watchdog Timer | Yes, internal RC-based WDT |
| Reset Circuitry | POR (Power-On Reset), BOR (Brown-Out Reset) |
| Encapsulado | 44-MQFP (10x10 mm), PQ suffix tray |
| Rango de temperatura de funcionamiento | -40C to +85C (Industrial, -I suffix) |
| Tipo de montaje | Surface Mount (QFP) |
| Estado RoHS | unknown |
| Lead-Free / Pb-Free | unknown |
Configuración de pines de PIC16LC74A-04I/PQ
| Pin 1 | /MCLR/VPP — Master Clear (reset) input / Programming voltage input |
| Pin 2 | RA0/AN0 — Port A bit 0 / Analog input channel 0 |
| Pin 3 | RA1/AN1 — Port A bit 1 / Analog input channel 1 |
| Pin 4 | RA2/AN2 — Port A bit 2 / Analog input channel 2 |
| Pin 5 | RA3/AN3/VREF — Port A bit 3 / Analog input channel 3 / ADC voltage reference |
| Pin 6 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — Port A bit 5 / Analog input channel 4 / SPI slave select |
| Pin 8 | RE0/RD/AN5 — Port E bit 0 / Parallel port read / Analog input channel 5 |
| Pin 9 | RE1/WR/AN6 — Port E bit 1 / Parallel write / Analog input channel 6 |
| Pin 10 | RE2/CS/AN7 — Port E bit 2 / Parallel chip select / Analog input channel 7 |
| Pin 11 | VDD — Positive supply (3.0V to 6.0V) |
| Pin 12 | VSS — Ground |
| Pin 13 | OSC1/CLKIN — Oscillator input / external clock input |
| Pin 14 | OSC2/CLKOUT — Oscillator output / clock output (Fosc/4) |
| Pin 15 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 output |
| Pin 17 | RC2/CCP1 — Port C bit 2 / CCP1 (Capture/Compare/PWM) output |
| Pin 18 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0/PSP0 — Port D bit 0 / Parallel Slave Port bit 0 |
| Pin 20 | RD1/PSP1 — Port D bit 1 / Parallel Slave Port bit 1 |
| Pin 21 | RD2/PSP2 — Port D bit 2 / Parallel Slave Port bit 2 |
| Pin 22 | RD3/PSP3 — Port D bit 3 / Parallel Slave Port bit 3 |
| Pin 23 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — Port C bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — Port C bit 6 / USART TX / USART clock |
| Pin 26 | RC7/RX/DT — Port C bit 7 / USART RX / USART data |
| Pin 27 | RD4/PSP4 — Port D bit 4 / Parallel Slave Port bit 4 |
| Pin 28 | RD5/PSP5 — Port D bit 5 / Parallel Slave Port bit 5 |
| Pin 29 | RD6/PSP6 — Port D bit 6 / Parallel Slave Port bit 6 |
| Pin 30 | RD7/PSP7 — Port D bit 7 / Parallel Slave Port bit 7 |
| Pin 31 | VSS — Ground |
| Pin 32 | VDD — Positive supply (3.0V to 6.0V) |
| Pin 33 | RB0/INT — Port B bit 0 / External interrupt input |
| Pin 34 | RB1 — Port B bit 1 |
| Pin 35 | RB2 — Port B bit 2 |
| Pin 36 | RB3 — Port B bit 3 |
| Pin 37 | RB4 — Port B bit 4 |
| Pin 38 | RB5 — Port B bit 5 |
| Pin 39 | RB6/PGC — Port B bit 6 / ICSP clock (programming/debug) |
| Pin 40 | RB7/PGD — Port B bit 7 / ICSP data (programming/debug) |
| Pin 41 | NC — Not connected (no internal bond) |
| Pin 42 | NC — Not connected (no internal bond) |
| Pin 43 | NC — Not connected (no internal bond) |
| Pin 44 | NC — Not connected (no internal bond) |
Aplicaciones típicas
PIC16LC74A-04I/PQ es adecuado para 6 aplicacións: Industrial Control Boards, Appliance User Interfaces, Security and Alarm Panels, Sensor Conditioning Front-Ends, Automotive Body Electronics, Low-Cost Embedded Products (Cost-Down Production).
Industrial Control Boards
The PIC16LC74A-04I/PQ suits industrial control boards thanks to its 33 I/O pins, 8-channel 8-bit ADC, and industrial -40C to +85C operating range. With 192 bytes of RAM and 7 KB OTP program memory, it can scan a 4x4 keypad, drive an alphanumeric LCD, and poll multiple analog sensors (thermistors, pressure transducers) in a deterministic loop. The PIC16C RISC core executes one instruction per four oscillator clocks at 4 MHz, yielding 1 MIPS - enough for PID loops at modest sampling rates. The integrated USART and SSP (SPI/I2C) interface to motor-driver pre-regulators, EEPROM parameter storage, and isolated RS-485 transceivers. OTP cost optimization pays off in high-volume panels where firmware is locked at production.
Recomendado
Appliance User Interfaces
For appliance front-panel controllers (washing machines, microwave ovens, dishwasher HMIs), the PIC16LC74A-04I/PQ delivers the right peripheral mix. Its 33 I/O pins can directly drive 7-segment LED displays, multiplexed keypads, and status-indicator LEDs without external drivers. The 8-bit ADC reads temperature sensors, water-level probes, and humidity elements, while the CCP module generates PWM for buzzer tones and small DC motor speed control. The 3.0V to 6.0V supply range accommodates 5V-regulated appliance rails, and the industrial temperature grade survives behind-machine environments. OTP memory locks UI firmware at production, preventing end-user firmware tampering - a regulatory plus for safety-certified appliances.
Recomendado
Security and Alarm Panels
The PIC16LC74A-04I/PQ fits security/alarm control panels where its 33 I/O pins can monitor up to 16 zones (with key-switch multiplexing), drive a siren driver, and read a 4x4 keypad. The integrated 8-channel ADC monitors backup-battery voltage, PIR sensor analog outputs, and glass-break detectors. The USART links to a digital dialer or central-station modem, while the SSP (I2C mode) connects to a serial EEPROM that stores event logs and installer codes. Brown-out reset (BOR) and watchdog timer (WDT) ensure recovery from power glitches and code lockups - both critical for unattended alarm systems. OTP locks the firmware to prevent reverse-engineering of proprietary encryption routines.
Recomendado
Sensor Conditioning Front-Ends
Use the PIC16LC74A-04I/PQ as a sensor conditioning front-end that reads multiple transducers and outputs a conditioned 4-20 mA or RS-485 signal. Its 8-channel 8-bit ADC digitizes up to eight analog inputs (thermocouple amplifiers, strain-gauge bridges, pH probes) at moderate sampling rates. The 7 KB OTP program memory fits calibration routines, linearization tables, and Modbus RTU protocol stacks. The integrated USART talks directly to RS-485 transceivers for industrial networking, while the CCP module generates excitation pulses for RTD and thermistor sensors. The 44-MQFP footprint exposes all 33 I/O for parallel sensor matrix designs.
Recomendado
Automotive Body Electronics
Body-control modules (mirror adjusters, seat controllers, climate panel interfaces, aftermarket alarm systems) historically used the PIC16LC74A-04I/PQ. The 33 I/O pins drive multiple brushed motors via relay arrays, scan keypad matrices, and read thermistor temperature sensors. The 8-bit ADC monitors battery voltage (12V automotive bus) and analog position feedback from potentiometers. The industrial -40C to +85C temperature range covers cabin environments, though under-hood designs require the AEC-Q100 qualified PIC16LC74A-04I/PQ automotive-grade equivalent. The USART connects to body-network LIN bus transceivers for sub-bus expansion.
Recomendado
Low-Cost Embedded Products (Cost-Down Production)
The OTP program memory makes the PIC16LC74A-04I/PQ the lowest unit-cost option in the PIC16C7x family once firmware is locked, ideal for cost-sensitive consumer products where field firmware updates are not required. Examples include electronic toys, low-end remote controls, simple point-of-sale terminals, and disposable medical accessories. Design teams typically prototype with the Flash PIC16F74-I/PQ (identical pinout and peripherals) and switch to the PIC16LC74A OTP for production runs once firmware is final. The 192-byte RAM, 7 KB code space, and 4 MHz clock are sufficient for menu navigation, button debouncing, simple sound playback, and LCD text rendering.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC16LC74A-04I/PQ — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC16LC74A-04/PQ | PIC16LC74AT-04I/PQ | PIC16LC74B-04I/PQ | PIC16F74-I/PQ | PIC16F74A-I/PQ |
|---|---|---|---|---|---|---|
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same | 44-MQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Program Memory Type | OTP (7 KB / 4K x 14) | OTP (7 KB) - same | OTP (7 KB) - same | OTP (7 KB) - same | Flash (7 KB) - re-programmable | Flash (7 KB) - re-programmable |
| Maximum Clock Frequency | 4 MHz | 4 MHz - same | 4 MHz - same | 4 MHz - same | 20 MHz - faster | 20 MHz - faster |
| Operating Voltage Range | 3.0 V to 6.0 V | 3.0 V to 6.0 V - same | 3.0 V to 6.0 V - same | 3.0 V to 6.0 V - same | 3.0 V to 6.0 V - same | 3.0 V to 6.0 V - same |
| I/O Pin Count | 33 | 33 - same | 33 - same | 33 - same | 33 - same | 33 - same |
| ADC Channels x Resolution | 8 x 8-bit | 8 x 8-bit - same | 8 x 8-bit - same | 8 x 8-bit - same | 8 x 8-bit - same | 8 x 10-bit - higher resolution |
| Operating Temperature Range | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same | -40C to +85C (Industrial) - same |
| Lifecycle Status (as of 2026-09-22) | Obsolete | Obsolete | Obsolete | Obsolete | Active (recommended migration) | Active (recommended migration) |
Diferenciadores clave
- Largest I/O count and ADC channel count in the PIC16C7x family (frente a PIC16LC73A-04I/SO)
- Low-voltage CMOS (LC) variant enables 3.0V operation (frente a PIC16C74A-04E/PQ)
- OTP program memory locks firmware at production (frente a PIC16F74-I/PQ)
Notas de diseño
The PIC16LC74A-04I/PQ operates from 3.0V to 6.0V; place a 100 nF decoupling capacitor within 5 mm of each VDD/VSS pair (pins 11/12 and 31/32) and a bulk 10 uF tantalum or aluminum-polymer capacitor at the supply entry point. Use the on-chip Brown-Out Reset (BOR) by configuring the configuration fuses for the lowest threshold above the minimum operating voltage - this guarantees a clean reset when the rail droops below 3.0V under motor inrush.
OTP (One-Time-Programmable) memory cannot be erased. Once the PIC16LC74A-04I/PQ is programmed, any code bug requires a new physical part. Always prototype with the Flash PIC16F74-I/PQ (identical 44-MQFP pinout, identical peripherals per datasheet 30390E) and only commit to the OTP PIC16LC74A once firmware is locked. Stock a small Flash inventory as a development hedge before placing the OTP production order.
The 44-MQFP (10x10 mm) package uses 0.8 mm pitch gull-wing leads - allocate 0.4 mm copper pads with 0.2 mm mask expansion for hand-reworkability. Place the crystal/oscillator (pins 13/14) within 10 mm of the IC with a ground guard ring and route OSC1/OSC2 traces over a continuous ground pour to minimize EMI coupling. The /MCLR pin (pin 1) needs a 10 kohm pull-up to VDD and a 100 nF capacitor to ground for noise immunity.
Información de cumplimiento
Obsolete Microchip PIC16LC74A-04I/PQ from 1990s vintage. RoHS, lead-free, halogen-free status was not explicitly listed in the Verified Web Data and should be confirmed against the latest Microchip product declaration before new-design integration. The part is not AEC-Q100 qualified; for automotive body-electronics applications requiring formal qualification, use the AEC-Q100 graded PIC16F74A-I/PQ Flash equivalent instead.
