PIC16C74B-04I/L - 8-bit OTP MCU, 7KB, 4MHz, 44-PLCC | Microchip
N.º de pieza: PIC16C74B-04I/L ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.03 | $4,03 |
| 10 | $3.78 | $37,80 |
| 100 | $3.42 | $342,00 |
| 500 | $2.95 | $1.475,00 |
| 1.000 | $2.61 | $2.610,00 |
PIC16C74B-04I/L Descripción general
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripheral interfaces onto one silicon die. Within the broader taxonomy, the PIC16C74B belongs to the mid-range 8-bit MCU class (vs. baseline 12-bit core and enhanced 14-bit core), uses Harvard architecture with separate program/data buses, and executes one instruction per internal clock cycle (except program branches which are two cycles). The mid-range PIC family employs an advanced RISC instruction set with only 35 single-word instructions, enabling rapid code development and high code density. OTP (One-Time Programmable) memory is mask-ROM-like non-volatile storage that can be written once during production programming - distinct from flash which can be rewritten many times in-circuit.
Key features include 8 channels of 8-bit Analog-to-Digital conversion, two additional 8-bit timers (TMR0, TMR1, TMR2), two Capture/Compare/PWM modules, a synchronous serial port configurable as either 3-wire SPI or 2-wire I2C, and a USART with 9-bit address detection. The device operates from 2.5V to 5.5V across the industrial temperature range, includes an 8-level hardware stack, power-on reset, brown-out detect, watchdog timer with on-chip RC oscillator, and in-circuit serial programming capability.
The PIC16C74B uses Microchip's PIC16C mid-range core built on a fully-static CMOS process, with a 14-bit instruction word and 8-bit data path. The Harvard architecture allows simultaneous instruction fetch and data access, and the 200 ns instruction execution at 4 MHz provides deterministic interrupt response suitable for real-time control loops. The on-chip peripherals are mapped into the data memory space and accessed via banked registers, with the FSR/INDF indirect addressing mechanism for pointer-based data access.
Typical applications include industrial control panels, motor control subsystems, automotive body electronics (pre-CAN era), smart sensor interfaces, and embedded control modules requiring reliable OTP memory with deterministic interrupt latency. The 33 I/O pins and dual PWM channels make the device suitable for driving multiple actuators or LED arrays from a single chip.
When designing with this device, ensure the OTP programming step is integrated into the production flow because OTP memory cannot be field-upgraded. The PLCC package provides socket compatibility for legacy through-hole production lines but requires a footprint transition for new designs moving to surface-mount packages. The 4 MHz maximum clock is the limiting performance factor; designs requiring higher throughput should consider the PIC16C74B-10 or PIC16C74B-20 speed grades or the flash-based PIC18F family.
This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes - including pinout, package-svg, and FAQ not found on the manufacturer datasheet alone - to accelerate component selection for engineers maintaining legacy PIC16C designs.
Alternativas directas para PIC16C74B-04I/L — 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 PIC16C74B-04I/L (mismo factor de forma y huella) — difiere en Package, Timers, Core Architecture, Operating Temperature, Serial Interfaces.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC16C74B-04/L
✅ Sustitución directa✓ En stock
$3.32 / unidad
Ver hoja de datos →PIC16C74B-04E/L
✅ Sustitución directa✓ En stock
$9.3 / unidad
Ver hoja de datos →PIC16C73B-04I/L
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PIC16C74B-04/PQ
✅ Sustitución directa✓ En stock
$7.25 / unidad
Ver hoja de datos →PIC16C74A-10I/L
✅ Sustitución directa✓ En stock
$6.1 / unidad
Ver hoja de datos →PIC16C74A-04I/L
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PIC16C74B-04I/L Valores máximos y características eléctricas
| Core Architecture | PIC16C mid-range 8-bit RISC |
| Instruction Set Size | 35 single-word instructions |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 7 KB (4K x 14) |
| Data RAM | 192 bytes |
| Data EEPROM | Not present (OTP device) |
| Frecuencia de reloj máxima | 4 MHz |
| Instruction Cycle Time | 200 ns |
| Operating Voltage Range | 2.5 V to 5.5 V |
| Digital I/O Pins | 33 |
| Analog-to-Digital Converter | 8 channels, 8-bit resolution |
| Timers | 3 (TMR0, TMR1, TMR2) |
| Capture/Compare/PWM | 2 modules |
| Serial Interfaces | SPI / I2C (SSP) + USART |
| Encapsulado | 44-pin PLCC (J-Lead), 16.59 x 16.59 mm |
| Rango de temperatura de funcionamiento | -40 C to +85 C (Industrial) |
| Tipo de montaje | Surface Mount (PLCC socket compatible) |
Configuración de pines de PIC16C74B-04I/L
| Pin 1 | MCLR/VPP — Master Clear (Reset) input / Programming voltage |
| Pin 2 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF — Port A bit 3 / Analog input 3 / ADC reference |
| Pin 6 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| Pin 7 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | RE0/RD/AN5 — Port E bit 0 / Parallel port read / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — Port E bit 1 / Parallel port write / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — Port E bit 2 / Parallel port chip select / Analog input 7 |
| Pin 11 | VDD — Positive supply voltage (+5V typical) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Crystal oscillator input / external clock |
| Pin 14 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| Pin 15 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer 1 oscillator / clock |
| Pin 16 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer 1 oscillator / CCP2 |
| Pin 17 | RC2/CCP1 — Port C bit 2 / Capture/Compare/PWM 1 |
| 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 / clock |
| Pin 26 | RC7/RX/DT — Port C bit 7 / USART RX / 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 reference |
| Pin 32 | VDD — Positive supply voltage (+5V typical) |
| Pin 33 | RB0/INT — Port B bit 0 / External interrupt |
| Pin 34 | RB1 — Port B bit 1 |
| Pin 35 | RB2 — Port B bit 2 |
| Pin 36 | RB3/PGM — Port B bit 3 / Low-voltage programming |
| Pin 37 | RB4 — Port B bit 4 |
| Pin 38 | RB5 — Port B bit 5 |
| Pin 39 | RB6/PGC — Port B bit 6 / ICSP clock |
| Pin 40 | RB7/PGD — Port B bit 7 / ICSP data |
| Pin 41 | VSS — Ground reference |
| Pin 42 | VDD — Positive supply voltage (+5V typical) |
| Pin 43 | NC — Not connected (PLCC pin reserved) |
| Pin 44 | NC — Not connected (PLCC pin reserved) |
Aplicaciones típicas
PIC16C74B-04I/L es adecuado para 6 aplicacións: Industrial Control Panels, Motor Control Subsystems, Smart Sensor Interfaces, Embedded Automotive Body Electronics, HVAC Climate Control Modules, LED Display Controllers.
Industrial Control Panels
The PIC16C74B-04I/L fits industrial control panel designs because its 33 digital I/O pins can directly drive 7-segment displays, keypads, relay coils, and status LEDs without external logic. Its 8-channel 8-bit ADC reads potentiometers, voltage dividers, and analog sensor outputs from the panel's front-end circuitry, while the 2.5V-5.5V supply tolerates typical 5V industrial backplanes. The -40C to +85C industrial temperature range keeps the controller reliable inside unheated enclosures on factory floors, and the 200 ns deterministic interrupt response ensures consistent keypad-debounce and relay-debounce timing. The USART drives Modbus RTU over RS-485 through an external transceiver, and the on-chip SPI/I2C peripherals connect to EEPROM calibration storage and digital potentiometers for field-trimmable setpoints.
Recomendado
Motor Control Subsystems
The PIC16C74B-04I/L suits low-cost motor control designs where the 2 CCP/PWM modules generate complementary drive waveforms for small DC or stepper motors below 1A continuous current. The 8-channel ADC samples shunt current, back-EMF, and potentiometer position feedback in real time at up to approximately 20 kS/s aggregate throughput. The -40C to +85C rating tolerates the thermal environment inside motor housings, and the 33 I/O pins drive direction logic, enable lines, and fault inputs without external glue logic. The USART reports telemetry to a host controller for predictive maintenance, while the on-chip watchdog timer with dedicated oscillator catches firmware lockups caused by EMI from the motor's commutator.
Recomendado
Smart Sensor Interfaces
The PIC16C74B-04I/L is well-suited for smart sensor interface modules that aggregate multiple analog and digital sensors into a single fieldbus node. The 8-channel 8-bit ADC reads thermocouples, RTDs, strain gauges, and 4-20 mA loops with on-chip multiplexing; the SPI peripheral connects to digital temperature sensors or accelerometers; and the I2C bus interfaces to EEPROM calibration memory and LCD character displays. The 192-byte RAM buffers sensor data between conversion cycles, and the USART provides RS-232 or RS-485 output for industrial networks. The industrial temperature range of -40C to +85C allows deployment in outdoor and unheated cabinets common to SCADA and process-control installations.
Recomendado
Embedded Automotive Body Electronics
The PIC16C74B-04I/L fits pre-CAN-era automotive body modules controlling lighting, mirrors, seat positioning, and HVAC blend doors. Its 33 I/O pins drive lamp relays, stepper motor windings, and dashboard indicators directly; the ADC reads position sensors and ambient light sensors; and the PWM modules dim interior lighting or drive small BLDC fans. The -40C to +85C industrial temperature range meets cabin-electronics requirements but is not qualified for under-hood engine control. Note that AEC-Q100 automotive qualification is NOT available for the PIC16C74B family; automotive designs after 2020 should use AEC-Q100-qualified PIC16F or dsPIC33 parts. The OTP memory is suitable for high-volume automotive production where firmware is locked at factory programming.
Recomendado
HVAC Climate Control Modules
The PIC16C74B-04I/L integrates HVAC climate control logic by reading multiple thermistor inputs through its 8-channel ADC, driving triac gate pulses through the 2 CCP/PWM modules for heater/coolant valve modulation, and displaying setpoint temperatures via the SPI peripheral to a character LCD. The 192-byte RAM maintains hysteresis and PID state across cycles without external memory. The 33 I/O pins support multiple button inputs, fan-speed relays, and mode-select LEDs; the USART reports diagnostics to a central controller. The industrial -40C to +85C rating tolerates plenum-mounted enclosures near heating ducts. For new HVAC designs, evaluate the PIC18F4620 flash-based successor for field firmware updates via in-circuit serial programming.
Recomendado
LED Display Controllers
The PIC16C74B-04I/L drives multi-segment LED matrix displays where the 33 I/O pins provide direct row/column multiplexing without external shift-register chains. The 2 CCP/PWM modules generate multiplex timing or analog dimming signals, and the on-chip 8-channel ADC reads ambient light sensors for automatic brightness adjustment. The USART receives display data and commands from a host processor at 115.2 kbps or higher. The OTP memory locks the multiplexing algorithm at production, eliminating field-tampering risk in digital-signage applications. The 200 ns instruction cycle ensures refresh rates above 100 Hz for flicker-free operation, even when managing 8x8 or larger LED matrices. Industrial temperature rating supports outdoor kiosk installations.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC16C74B-04I/L — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC16C74B-04/L | PIC16C73B-04I/L | PIC16C74A-10I/L |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-pin PLCC (J-Lead) | 44-pin PLCC (J-Lead) - same | 44-pin PLCC (J-Lead) - same | 44-pin PLCC (J-Lead) - same |
| Maximum Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 10 MHz (+150%) |
| Program Memory | 7 KB OTP (4K x 14) | 7 KB OTP | 4 KB OTP (-43%) | 7 KB OTP |
| Data RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Digital I/O Pins | 33 | 33 | 22 (28-pin feature set on 44-PLCC) | 33 |
| ADC Channels | 8 x 8-bit | 8 x 8-bit | 5 x 8-bit (-38%) | 8 x 8-bit |
| CCP/PWM Modules | 2 | 2 | 2 | 2 |
| Operating Temperature | -40 C to +85 C (Industrial) | 0 C to +70 C (Commercial) | -40 C to +85 C (Industrial) | -40 C to +85 C (Industrial) |
| Lifecycle Status | NRND | NRND | NRND | NRND |
Diferenciadores clave
- Industrial temperature grade OTP microcontroller (frente a PIC16C74B-04/L)
- Largest memory in PIC16C74B family (frente a PIC16C73B-04I/L)
- Mid-range core with full peripheral set (frente a PIC16C74A-10I/L)
Notas de diseño
Decouple the PIC16C74B-04I/L with a 100 nF ceramic capacitor placed within 5 mm of each VDD/VSS pin combination (pins 11/12, 31/41, 32/42 on the 44-PLCC). The PIC16C74B datasheet recommends an additional 10 uF bulk capacitor near the VDD pin cluster. Brown-out detect should be enabled in the configuration word for reliable reset behavior during supply droops below 4.0V; without BOD, voltage drops can cause corrupted program execution in OTP memory reads.
Place the 4 MHz crystal or ceramic resonator within 10 mm of OSC1 (pin 13) and OSC2 (pin 14) to minimize parasitic capacitance. Add a ground guard ring around the oscillator traces and route them over a continuous ground plane to reduce EMI pickup. The MCLR pin (pin 1) requires a 10 kohm pull-up to VDD and a 100 nF capacitor to ground for proper in-circuit serial programming (ICSP) operation.
OTP memory is one-time programmable - any firmware bug shipped to production becomes permanent and cannot be patched without a full chip replacement. Always verify firmware on a flash-based development part (PIC16F877A-I/L or PIC16F877) before committing to PIC16C74B production programming. Configuration bits must be set correctly during programming or the device will not execute; most common failures are wrong oscillator mode (RC vs XT vs HS) and disabled watchdog or brown-out reset.
Route the ICSP clock (PGC, pin 39) and ICSP data (PGD, pin 40) signals away from high-current switching nodes such as PWM outputs and relay drive traces. Keep serial-port traces (RC6/RC7 for USART, RC3-RC5 for SPI/I2C) matched in length and routed over a continuous ground plane for signal integrity. The PLCC-44 socket allows field replacement but introduces parasitic inductance - for production PCBs consider surface-mount PQFP variants to reduce EMI.
Información de cumplimiento
AEC-Q100 automotive qualification is NOT available for PIC16C74B family - use AEC-Q100-qualified PIC16F or dsPIC33A parts for automotive designs. RoHS/REACH/lead-free status not specified in provided data - [DATA_NEEDED].
