PIC16C74BT-20I/PT - 8-bit 20MHz 7KB OTP MCU 44-TQFP | Microchip
N.º de pieza: PIC16C74BT-20I/PT ✗ Fin de vida| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $4.65 | $4,65 |
| 10 | $4.2 | $42,00 |
| 100 | $3.78 | $378,00 |
| 500 | $3.4 | $1.700,00 |
| 1.000 | $3.02 | $3.020,00 |
PIC16C74BT-20I/PT Descripción general
An 8-bit microcontroller (MCU) is a single-chip processor that integrates a CPU core, program memory, working RAM, peripherals, and interrupt logic on one die, optimized for embedded control tasks where deterministic real-time response, low cost, and small code footprint are more important than raw compute throughput. Within the power management hierarchy of a typical embedded system, the PIC16C74BT-20I/PT sits between the 5V power rail and the analog/digital peripherals, generating the timing signals, sequencing I/O, and serving as the central state machine. Synonymous terms include MCU, micro-controller, microcontroller unit, and embedded controller.
Key features include Harvard architecture with separate program and data buses, 14-bit wide instruction words, single-cycle instruction execution except for branches, an 8-level deep hardware stack, and on-chip brown-out and power-on reset. The industrial-grade "I" temperature grade supports -40C to +85C operation, and the "T" suffix indicates tape-and-reel packaging suitable for high-volume SMT assembly.
The PIC16C74B silicon combines the mid-range PIC core with the Capture/Compare/PWM (CCP) module and an 8-channel 8-bit ADC, enabling mixed-signal designs where sensing and motion control coexist with serial communication to host processors. The OTP program memory allows factory or field programming before final seal, which simplifies prototyping versus windowed EPROM parts.
Typical applications include industrial control panels, appliance control boards, motor drive signal conditioning, sensor interfacing front-ends, and embedded serial-communication bridges. The 33 I/O pins and built-in UART make it well suited for legacy 5V system upgrades where pin-compatible migration from older PIC16C7x parts is required.
When designing with the PIC16C74BT-20I/PT, reserve a 100nF decoupling capacitor adjacent to each VDD/VSS pair on the PCB and provide a clean +5V rail. Because the device is OTP, plan firmware revisions carefully; consider the flash-based PIC16F74 for engineering development where in-circuit reprogramming is needed.
This page synthesizes current distributor pricing, drop-in pin-compatible alternatives, and design guidance not consolidated on the manufacturer datasheet, giving engineers and buyers a single decision-ready reference.
Alternativas directas para PIC16C74BT-20I/PT — 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 PIC16C74BT-20I/PT (mismo factor de forma y huella) — difiere en Package, Program Memory Size, ADC, Operating Temperature Range, Program Memory Type.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
PIC16F74-I/PT
✅ Sustitución directa✓ En stock
$5.55 / unidad
Ver hoja de datos →PIC16C74B-20I/PT
✅ Sustitución directa✓ En stock
$4.62 / unidad
Ver hoja de datos →PIC16C73B-20I/PT
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
PIC16C74AT-20I/PT
✅ Sustitución directa✓ En stock
$5.98 / unidad
Ver hoja de datos →PIC16C74BT-04I/PT
✅ Sustitución directa✓ En stock
$7.1 / unidad
Ver hoja de datos →PIC16C74BT-20I/PT Valores máximos y características eléctricas
| Core Architecture | PIC 8-bit RISC mid-range |
| Program Memory Type | OTP (One-Time Programmable EPROM) |
| Program Memory Size | 7 KB (4K x 14 bits) |
| RAM Size | 192 bytes |
| Maximum CPU Frequency | 20 MHz |
| Instruction Width | 14 bits |
| Supply Voltage (Vdd) | 5 V nominal |
| I/O Pins | 33 |
| ADC | 8-bit, up to 8 channels |
| Timers | 3 x 8/16-bit Timer modules |
| Communication Interfaces | UART/USART, SPI, I2C (SSP) |
| Rango de temperatura de funcionamiento | -40C to +85C (Industrial grade) |
| Encapsulado | 44-pin TQFP (10x10 mm) |
| Tipo de montaje | Surface Mount |
Configuración de pines de PIC16C74BT-20I/PT
| Pin 1 | MCLR/VPP — Master Clear reset input or programming voltage input |
| Pin 2 | RA0/AN0 — PORTA bit 0 / Analog input 0 |
| Pin 3 | RA1/AN1 — PORTA bit 1 / Analog input 1 |
| Pin 4 | RA2/AN2 — PORTA bit 2 / Analog input 2 |
| Pin 5 | RA3/AN3/VREF — PORTA bit 3 / Analog input 3 / ADC voltage reference |
| Pin 6 | RA4/T0CKI — PORTA bit 4 / Timer0 clock input |
| Pin 7 | RA5/AN4/SS — PORTA bit 5 / Analog input 4 / SPI slave select |
| Pin 8 | RE0/RD/AN5 — PORTE bit 0 / Parallel slave read / Analog input 5 |
| Pin 9 | RE1/WR/AN6 — PORTE bit 1 / Parallel slave write / Analog input 6 |
| Pin 10 | RE2/CS/AN7 — PORTE bit 2 / Parallel slave chip select / Analog input 7 |
| Pin 11 | VDD — Positive supply (5V) |
| Pin 12 | VSS — Ground reference |
| Pin 13 | OSC1/CLKIN — Crystal oscillator input or external clock input |
| Pin 14 | OSC2/CLKOUT — Crystal oscillator output or clock output |
| Pin 15 | RC0/T1OSO/T1CKI — PORTC bit 0 / Timer1 oscillator output / Timer1 clock input |
| Pin 16 | RC1/T1OSI/CCP2 — PORTC bit 1 / Timer1 oscillator input / Capture/Compare/PWM2 |
| Pin 17 | RC2/CCP1 — PORTC bit 2 / Capture/Compare/PWM1 |
| Pin 18 | RC3/SCK/SCL — PORTC bit 3 / SPI clock / I2C clock |
| Pin 19 | RD0 — PORTD bit 0 |
| Pin 20 | RD1 — PORTD bit 1 |
| Pin 21 | RD2 — PORTD bit 2 |
| Pin 22 | RD3 — PORTD bit 3 |
| Pin 23 | RC4/SDI/SDA — PORTC bit 4 / SPI data in / I2C data |
| Pin 24 | RC5/SDO — PORTC bit 5 / SPI data out |
| Pin 25 | RC6/TX/CK — PORTC bit 6 / USART transmit / USART clock |
| Pin 26 | RC7/RX/DT — PORTC bit 7 / USART receive / USART data |
| Pin 27 | RD4 — PORTD bit 4 |
| Pin 28 | RD5 — PORTD bit 5 |
| Pin 29 | RD6 — PORTD bit 6 |
| Pin 30 | RD7 — PORTD bit 7 |
| Pin 31 | VSS — Ground reference |
| Pin 32 | VDD — Positive supply (5V) |
| Pin 33 | RB0/INT — PORTB bit 0 / External interrupt input |
| Pin 34 | RB1 — PORTB bit 1 |
| Pin 35 | RB2 — PORTB bit 2 |
| Pin 36 | RB3 — PORTB bit 3 (also ICSP programming clock) |
| Pin 37 | RB4 — PORTB bit 4 |
| Pin 38 | RB5 — PORTB bit 5 |
| Pin 39 | RB6/PGC — PORTB bit 6 / ICSP program clock |
| Pin 40 | RB7/PGD — PORTB bit 7 / ICSP program data |
| Pin 41 | AVDD — Analog positive supply |
| Pin 42 | AVSS — Analog ground reference |
| Pin 43 | NC — Not connected (per datasheet) |
| Pin 44 | NC — Not connected (per datasheet) |
Aplicaciones típicas
PIC16C74BT-20I/PT es adecuado para 7 aplicacións: Industrial Control Panels, Appliance Control Boards, Motor Drive Signal Conditioning, Sensor Interfacing Front-Ends, Embedded Serial-Communication Bridges, Legacy 5V System Upgrades, Automotive Body Electronics (Non-Safety).
Industrial Control Panels
The PIC16C74BT-20I/PT's 33 digital I/O lines, 5V operation, and -40C to +85C industrial temperature range make it well suited for factory-floor control panels driving relays, keypads, and 7-segment displays. Its 20 MHz PIC mid-range core executes deterministic control loops in single instruction cycles, and the integrated UART/USART plus MSSP (SPI/I2C) connect directly to HMI display modules and external EEPROMs. Place 100nF decoupling on each VDD/VSS pair and use the brown-out reset to ensure defined startup after noisy power events on the 24V-to-5V industrial rail.
Recomendado
Appliance Control Boards
Household appliances such as washing machines, dishwashers, and microwave ovens benefit from the PIC16C74BT-20I/PT's 7 KB OTP program memory, 8-channel 8-bit ADC, and three timer modules. The ADC reads temperature sensors and water levels, the timers drive PWM for motor speed control via the CCP module, and the UART links to inverter boards. The 5V-only supply and industrial temperature grade align with appliance certifications, while the 44-pin TQFP supports compact PCB designs.
Recomendado
Motor Drive Signal Conditioning
The PIC16C74BT-20I/PT provides the Capture/Compare/PWM (CCP) module, three timers, and the 8-bit ADC required for brushed-DC and stepper motor feedback loops. The 20 MHz clock gives 200ns instruction cycles, sufficient for trapezoidal commutation at moderate RPM, and the 33 I/O pins handle Hall-sensor inputs, gate-driver enables, and fault feedback. For variable-speed drives, sample the ADC at 1 kHz and let the CCP generate the PWM carrier without CPU intervention.
Recomendado
Sensor Interfacing Front-Ends
The PIC16C74BT-20I/PT's 8-channel 8-bit ADC, MSSP (SPI/I2C) peripheral, and 192-byte RAM suit it for sensor-hub modules that aggregate multiple analog and digital sensors and forward results over UART. The ADC can scan 8 inputs at up to 30 kS/s aggregate, and the MSSP drives I2C sensors or SPI ADCs. Use the SSP interrupt to wake the CPU only on sensor-ready events, lowering average current for line-powered monitoring nodes.
Recomendado
Embedded Serial-Communication Bridges
Protocol-converter applications like UART-to-I2C or UART-to-SPI bridges map naturally to the PIC16C74BT-20I/PT's integrated UART/USART and MSSP peripherals. The 20 MHz core provides headroom for bit-banged or interrupt-driven protocol translation, and the 192-byte RAM buffers incoming frames. The 5V supply matches legacy RS-232 transceivers, and the 33 I/O pins leave spare lines for status LEDs and configuration switches.
Recomendado
Legacy 5V System Upgrades
Designers maintaining 5V embedded systems built around older PIC16C7x devices can upgrade to the PIC16C74BT-20I/PT with minimal risk because the 44-pin TQFP, peripheral set, and instruction set are preserved across the family. The 5V supply matches existing analog front-ends and the industrial temperature range supports legacy industrial installations. Use the brown-out reset and watchdog timer for unattended equipment where power-quality is unpredictable.
Recomendado
Automotive Body Electronics (Non-Safety)
The PIC16C74BT-20I/PT's industrial temperature grade and 5V supply make it a candidate for non-safety automotive body electronics such as interior lighting controllers, seat adjustment modules, and accessory multiplexers. Its 33 I/O and UART/USART support LIN-bus-like communication through external transceivers, and the ADC reads switch positions. Note that this part is not AEC-Q100 qualified; use it only in non-safety subsystems where the industrial temperature range is acceptable.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para PIC16C74BT-20I/PT — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | PIC16F74-I/PT | PIC16C74B-20I/PT | PIC16C73B-20I/PT | PIC16C74AT-20I/PT | PIC16C74BT-04I/PT |
|---|---|---|---|---|---|---|
| Package | 44-pin TQFP (10x10 mm) | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP (10x10 mm) - same | 44-pin TQFP (10x10 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | 8-bit PIC mid-range | 8-bit PIC mid-range | 8-bit PIC mid-range | 8-bit PIC mid-range | 8-bit PIC mid-range | 8-bit PIC mid-range |
| Program Memory Type | OTP EPROM (7 KB) | Flash (7 KB) - reprogrammable | OTP EPROM (7 KB) | OTP EPROM (4 KB) - reduced | OTP EPROM (7 KB) - A revision | OTP EPROM (7 KB) |
| Program Memory Size | 7 KB (4K x 14) | 7 KB flash | 7 KB | 4 KB (-43%) | 7 KB | 7 KB |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 4 MHz (-80%) |
| RAM Size | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 |
| ADC | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels | 8-bit, 8 channels |
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) |
Diferenciadores clave
- In-circuit reprogrammability vs OTP (frente a PIC16F74-I/PT)
- Lower cost vs larger-memory siblings (frente a PIC16C74B-20I/PT)
- Maximum 20 MHz clock vs lower-clock parts (frente a PIC16C74BT-04I/PT)
- Smaller program memory than PIC16C74B but pin-compatible (frente a PIC16C73B-20I/PT)
Notas de diseño
Place a 100nF ceramic decoupling capacitor within 5mm of every VDD/VSS pair on the PIC16C74BT-20I/PT, and add a bulk 10uF tantalum or aluminum cap at the board's 5V input. The PIC16C core draws short current spikes during instruction fetches; inadequate decoupling causes erratic resets or ADC drift. The analog supply AVDD and AVSS should be tied to the digital rails with a ferrite bead or filter to keep ADC reference noise below 1 LSB.
Route the 20 MHz crystal traces (OSC1, OSC2) short and symmetric, with a ground guard ring, to avoid stray pickup on the ADC inputs. Keep the MCLR/VPP trace away from high-current switching nodes (relay coils, motor drivers). The 44-pin TQFP has a 0.8mm pitch - use a 4-layer PCB with continuous ground plane under the device to reduce EMI and provide thermal spreading.
The 'T' suffix in PIC16C74BT-20I/PT denotes tape-and-reel packaging, not a different speed grade. The 'I' suffix indicates industrial temperature grade (-40C to +85C). A common mistake is to assume OTP is field-erasable - it is not; once programmed, the device cannot be electrically erased. For prototype firmware iteration, use the PIC16F74-I/PT (flash) on a development board and only commit OTP for production volumes.
When using the MSSP peripheral in SPI mode at 20 MHz Fosc, the maximum SCK frequency is Fosc/4 = 5 MHz. Configure the SPI clock prescaler accordingly and keep SPI traces matched in length to avoid reflections. For I2C, pull-up resistors in the 2.2 kohm to 4.7 kohm range (depending on bus capacitance) are required on SCL and SDA; the PIC16C74B I/O pins are open-drain when configured for I2C.
Información de cumplimiento
Compliance information not provided in verified web data. Industrial temperature grade -40C to +85C verified per datasheet. Part is NRND (Not Recommended for New Designs) per Microchip lifecycle policy.