PIC16C74B-04I/PQ - 8-Bit 4MHz OTP MCU, 7KB, 44-MQFP | Microchip
MPN: PIC16C74B-04I/PQ ✗ اختتامِ زندگیPIC16C74B-04I/PQ جائزہ
An 8-bit microcontroller is a small computer-on-a-chip that combines a CPU, RAM, non-volatile program memory, and peripherals on a single die. The PIC16C74B belongs to the PIC mid-range architecture hierarchy (8-bit PIC -> PIC16 family -> PIC16C7x sub-family), sits within the broader Microcontroller (MCU) category, and is part of Integrated Circuits > Microcontrollers. Mid-range PIC16 devices use a 14-bit instruction word and a RISC core with only 35 single-word instructions, providing deterministic timing and very low power consumption.
Key features include 8 channels of 8-bit Analog-to-Digital conversion, 33 digital I/O pins with 25 mA sink/source drive, two additional timers, two Capture/Compare/PWM modules, a synchronous serial port configurable as 3-wire SPI or 2-wire I2C, and a USART. Wide operating voltage spans 2.5 V to 6.0 V, with typical standby current of 1 uA at 3 V/32 kHz and 15 uA at 5 V/4 MHz, making the part suitable for both line-powered and battery-backed designs.
The architecture pairs a Harvard RISC core with 5 MIPS peak throughput at 4 MHz, an internal 8-bit data bus, and a 14-bit program bus. The OTP program memory is windowed for prototype development and field-programmed via Microchip's standard ICSP interface, while the EPROM-style die allows short reprogram cycles during engineering.
Typical applications include industrial control systems, instrumentation front-ends with on-chip ADC, motor-control PWM drivers, embedded sensor hubs, and legacy PIC16C designs being maintained or re-spun. The combination of USART, SPI/I2C and an 8-channel ADC makes the part a versatile single-chip solution for analog-dominated 5 V systems.
When designing with this MCU, budget for OTP one-time programming: code changes require new parts for production. Provide a robust decoupling network (100 nF + 10 uF) near VDD and use the MCLR reset circuit with the recommended 10 kohm pull-up.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the manufacturer datasheet.
کے لیے ڈراپ اِن متبادل PIC16C74B-04I/PQ — یکساں پیکیج، پن سے پن مطابقت پذیر۔ مختلف پیکیج والے پرزے جن کے لیے PCB دوبارہ کام درکار ہو، شامل نہیں ہیں۔
اس سیریز میں مختلف ورژن
اسی سیریز کے ماڈلز جو ڈراپ اِن مطابقت رکھتے ہیں PIC16C74B-04I/PQ (یکساں فارم فیکٹر اور فٹ پرنٹ) — میں مختلف Serial Interfaces, Package, Timers, Core Architecture, Operating Temperature.
PIC16C74B-04/PQ
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C74B-04I/L
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C74A-04I/PQ
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16C74B-04E/PQ
✅ ڈراپ-اِنقیمت کے لیے رابطہ کریں
ڈیٹا شیٹ دیکھیں →PIC16F74-I/PQ
✅ ڈراپ-اِن📋 حوالہ جاتی متبادل (کیٹلاگ میں نہیں)
PIC16C74B-04I/PQ زیادہ سے زیادہ ریٹنگز اور برقی خصوصیات
| Core Architecture | PIC16CXX mid-range 8-bit RISC |
| Instruction Set | 35 single-word instructions, 14-bit word |
| CPU Speed | 4 MHz (200 ns instruction cycle) |
| Program Memory | 7 KB (4K x 14) OTP |
| Data RAM | 192 bytes |
| I/O Pins | 33 digital I/O |
| ADC | 8 channels, 8-bit |
| Timers | 3 (Timer0, Timer1, Timer2) |
| Capture/Compare/PWM | 2 CCP modules |
| Serial Interfaces | 1x SPI/I2C (SSP) + 1x USART |
| Operating Voltage | 2.5 V to 6.0 V |
| I/O Sink/Source Current | 25 mA / 25 mA |
| Standby Current (3V, 32 kHz) | 1 uA typical |
| Operating Current (5V, 4 MHz) | 15 uA typical |
| پیکیج | 44-MQFP (10x10 mm) |
| آپریٹنگ درجہ حرارت | -40C to +85C (Industrial) |
| ماؤنٹنگ ٹائپ | Surface Mount |
PIC16C74B-04I/PQ پن کنفیگریشن
| پن 1 | MCLR — Master Clear (reset) input, active low |
| پن 2 | OSC1 — Oscillator input / external clock input |
| پن 3 | OSC2 — Oscillator output |
| پن 4 | RA0/AN0 — Port A bit 0 / analog channel 0 |
| پن 5 | RA1/AN1 — Port A bit 1 / analog channel 1 |
| پن 6 | RA2/AN2 — Port A bit 2 / analog channel 2 |
| پن 7 | RA3/AN3/VREF — Port A bit 3 / analog channel 3 / VREF input |
| پن 8 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| پن 9 | RA5/AN4/SS — Port A bit 5 / analog channel 4 / SPI slave select |
| پن 10 | VSS — Ground |
| پن 11 | VDD — Positive supply voltage |
| پن 12 | RB0/INT — Port B bit 0 / external interrupt |
| پن 13 | RB1 — Port B bit 1 |
| پن 14 | RB2 — Port B bit 2 |
| پن 15 | RB3 — Port B bit 3 |
| پن 16 | RB4 — Port B bit 4 |
| پن 17 | RB5 — Port B bit 5 |
| پن 18 | RB6/PGC — Port B bit 6 / ICSP clock |
| پن 19 | RB7/PGD — Port B bit 7 / ICSP data |
| پن 20 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator out / clock in |
| پن 21 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator in / CCP2 |
| پن 22 | RC2/CCP1 — Port C bit 2 / CCP1 |
| پن 23 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| پن 24 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| پن 25 | RC5/SDO — Port C bit 5 / SPI data out |
| پن 26 | RC6/TX/CK — Port C bit 6 / USART TX / clock |
| پن 27 | RC7/RX/DT — Port C bit 7 / USART RX / data |
| پن 28 | VSS — Ground |
| پن 29 | VDD — Positive supply voltage |
| پن 30 | RD0/PSP0 — Port D bit 0 / Parallel Slave Port bit 0 |
| پن 31 | RD1/PSP1 — Port D bit 1 / Parallel Slave Port bit 1 |
| پن 32 | RD2/PSP2 — Port D bit 2 / Parallel Slave Port bit 2 |
| پن 33 | RD3/PSP3 — Port D bit 3 / Parallel Slave Port bit 3 |
| پن 34 | RD4/PSP4 — Port D bit 4 / Parallel Slave Port bit 4 |
| پن 35 | RD5/PSP5 — Port D bit 5 / Parallel Slave Port bit 5 |
| پن 36 | RD6/PSP6 — Port D bit 6 / Parallel Slave Port bit 6 |
| پن 37 | RD7/PSP7 — Port D bit 7 / Parallel Slave Port bit 7 |
| پن 38 | AVSS — Analog ground |
| پن 39 | AVDD — Analog positive supply |
| پن 40 | RE0/RD — Port E bit 0 / Read control for PSP |
| پن 41 | RE1/WR — Port E bit 1 / Write control for PSP |
| پن 42 | RE2/CS — Port E bit 2 / Chip select for PSP |
| پن 43 | NC — Not connected (per datasheet) |
| پن 44 | NC — Not connected (per datasheet) |
عام استعمالات
PIC16C74B-04I/PQ کے لیے موزوں ہے 6 ایپلیکیشنs: Industrial Control PLCs, Motor Control PWM Drivers, Sensor Hub / Data Acquisition, Embedded Instrumentation Front-End, HVAC Control Boards, Legacy Embedded Maintenance.
Industrial Control PLCs
The PIC16C74B-04I/PQ fits industrial PLC front-ends because its 8-channel 8-bit ADC multiplexes directly onto analog sensors (temperature, pressure, 4-20 mA loops) while its 25 mA I/O drive sources and sinks relay coils and LED indicators without external buffers. Industrial -40C to +85C operation, USART for Modbus RTU over RS-485, and SPI/I2C for digital sensor extension all integrate on one die. Two CCP modules generate PWM for proportional valve or motor-speed control. The OTP memory locks firmware for code-security-sensitive installations. Power consumption is 15 uA active at 5 V/4 MHz and 1 uA standby at 3 V/32 kHz, suiting always-on panel instrumentation.
تجویز کردہ
Motor Control PWM Drivers
The PIC16C74B-04I/PQ drives brushed DC and stepper motors via its two Capture/Compare/PWM modules delivering 10-bit PWM resolution at up to ~20 kHz carrier frequency. The 4 MIPS throughput computes PI speed loops with adequate headroom for trapezoidal commutation of small BLDC motors. The 25 mA sink/source I/O eliminates predriver FETs for sub-1 A loads. Hardware timers (Timer0/1/2) provide encoder feedback capture and tick generation. Industrial -40C to +85C operation suits HVAC fan and pump controllers, while the OTP memory secures proprietary motor-tuning firmware from reverse engineering.
تجویز کردہ
Sensor Hub / Data Acquisition
The PIC16C74B-04I/PQ acts as a low-cost sensor hub for 4-20 mA loops, thermocouples (with external amp), and digital SPI/I2C sensors because its 8-channel ADC plus synchronous serial port covers mixed-signal designs in a single chip. The 192-byte RAM holds rolling buffers of 8 channels sampled at low rates, with USART forwarding data to a host controller or HMI display. Industrial temperature rating and 2.5-6.0 V VDD tolerate 5 V analog sensor rails directly. The 4 MIPS core runs polynomial correction algorithms for thermocouple linearization. OTP memory locks calibration constants in production.
تجویز کردہ
Embedded Instrumentation Front-End
The PIC16C74B-04I/PQ provides a complete front-end panel-meter or process-indicator controller: ADC channels read voltage/current transducers, PWM drives a 4-20 mA loop output via an external op-amp, and the USART outputs readings to a remote display. Industrial temperature range supports panel-mount installations. Two CCP modules generate precise PWM for proportional control loops. The OTP memory is ideal for shipping calibrated instruments with locked firmware. With 7 KB OTP and 192 B RAM, the part handles linearization tables, lookup tables for thermistors, and simple menu/UI logic on a small character LCD.
تجویز کردہ
HVAC Control Boards
The PIC16C74B-04I/PQ is well-suited to HVAC damper/valve controllers where multiple analog inputs (temperature, humidity, pressure) and PWM outputs (fan speed, valve position) are required. The 8-channel ADC handles several NTC/PTC thermistors with software linearization; two CCP modules drive TRIAC phase-control circuits or solid-state relay PWM at low frequency. The 25 mA I/O directly interfaces with opto-isolated TRIAC drivers. The -40C to +85C industrial rating covers unconditioned rooftop unit enclosures. OTP memory locks OEM calibration values and prevents unauthorized firmware tampering.
تجویز کردہ
Legacy Embedded Maintenance
The PIC16C74B-04I/PQ serves as maintenance stock for industrial systems deployed in the late 1990s and 2000s, where the PCB is hard-wired for a 44-MQFP footprint and rewrites to flash silicon would require a board respin. Its drop-in compatibility with PIC16F74 and PIC16C74B-04/PQ simplifies field replacements; technicians can swap the OTP part for the flash equivalent when in-system reprogramming is feasible. The PIC16C instruction-set and peripheral set match modern mid-range PIC16F variants, allowing firmware recompilation without source changes.
تجویز کردہ
تجویز کردہ پروڈکٹس کا خلاصہ
کے لیے انجینئرنگ ریفرنس ڈیٹا PIC16C74B-04I/PQ — موازنہ، ڈیزائن رہنمائی، اور تعمیل کی معلومات۔
انتخاب کی گائیڈ
متبادلات کے ساتھ موازنہ
| پیرامیٹر | یہ پروڈکٹ | PIC16C74B-04/PQ | PIC16C74B-04I/L | PIC16C74A-04I/PQ | PIC16C74B-04E/PQ | PIC16F74-I/PQ |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-MQFP (10x10 mm) | 44-MQFP (10x10 mm) - identical | 44-MQFP - footprint equivalent | 44-MQFP (10x10 mm) - identical | 44-MQFP (10x10 mm) - identical | 44-MQFP (10x10 mm) - identical |
| Program Memory | 7 KB (4K x 14) OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 4 KB Flash |
| RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Max CPU Speed | 4 MHz / 5 MIPS | 4 MHz / 5 MIPS | 4 MHz / 5 MIPS | 4 MHz / 5 MIPS | 4 MHz / 5 MIPS | 20 MHz / 5 MIPS (Flash variant) |
| ADC | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit | 8 ch x 8-bit (rev A errata) | 8 ch x 8-bit | 8 ch x 8-bit |
| Operating Temperature | -40C to +85C (Industrial) | 0C to +70C (Commercial) | -40C to +85C (Industrial) | -40C to +85C (Industrial) | -40C to +125C (Extended) | -40C to +85C (Industrial) |
| Memory Type | OTP (one-time programmable) | OTP | OTP | OTP | OTP | Flash (re-programmable) |
| Lifecycle | Obsolete | Obsolete | Obsolete | Obsolete | Obsolete | Active |
اہم امتیازی خصوصیات
- OTP code security with industrial temperature range (بمقابلہPIC16F74-I/PQ)
- Higher program memory density at same speed grade (بمقابلہPIC16C73B-04I/SP)
- Wider operating voltage range than PIC16F1X successors (بمقابلہPIC16F877A-I/P)
ڈیزائن نوٹس
Decouple VDD/AVDD with a 100 nF ceramic capacitor placed within 5 mm of each supply pin, plus a bulk 10 uF tantalum or ceramic on the main 5 V rail. The PIC16C74B-04I/PQ has separate digital VDD/VDD and analog AVDD/AVSS pins (pins 11/29/38/39); connect AVDD to VDD through a ferrite bead or 10 ohm resistor and AVSS to VSS with a star-ground topology. Operating current is 15 uA typical at 5 V/4 MHz and standby current drops to 1 uA at 3 V/32 kHz - budget decoupling accordingly for low-frequency sleep modes.
The PIC16C74B is OTP (one-time programmable) - code changes after programming require physical replacement of the chip, which is expensive in production. Plan firmware development on a windowed PIC16C74B JW or PIC16F74 equivalent before committing to OTP. Also note the Parallel Slave Port (Port D + RE0/RE1/RE2) shares pins with general-purpose I/O - if PSP is enabled in software, those pins lose their digital I/O function. Verify MCLR is pulled high through 10 kohm to VDD and never left floating, which causes random resets.
For the 44-MQFP package (10x10 mm, 0.8 mm pitch), use a 4-layer PCB with continuous ground plane under the IC to minimize EMI and provide thermal spreading. Place the 4 MHz crystal (or ceramic resonator) within 10 mm of OSC1/OSC2 (pins 2-3) and guard the traces with a ground ring. Add a 1 Mohm parallel resistor across the crystal for fast-startup oscillator designs. Route ICSP pins RB6/PGC and RB7/PGD to a 6-pin header (with VDD/VSS/MCLR) for in-circuit programming access - this is essential even though the part is OTP, for prototype-stage programming before production.
The PIC16C74B-04I/PQ's 25 mA source/sink capability allows direct drive of relays, LEDs and optocouplers without buffers; however, switching inductive loads requires flyback diodes (1N4148 or Schottky) across coils to prevent latch-up. For SPI communication above 1 MHz, add 10 kohm pull-ups on SCK/SDO and series 100 ohm termination on clock traces to reduce ringing. The ADC is 8-bit and tolerates source impedances up to 10 kohm - add 100 nF bypass on analog inputs if the source impedance exceeds 5 kohm to prevent ADC sampling errors.
تعمیل کی معلومات
RoHS and lead-free status not confirmed in verified web data; this is a 1990s-2000s era OTP MCU that may predate RoHS. AEC-Q100 not qualified - automotive applications should consider PIC16F877A-I/P or PIC18F variants.
