PIC16LC74B-04I/PT - 8-Bit MCU, 7KB OTP, 4MHz, 44-TQFP | Microchip
MPN: PIC16LC74B-04I/PT ✓ פעילPIC16LC74B-04I/PT סקירה
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory (ROM/Flash/OTP), data memory (RAM), and peripheral interfaces such as timers, ADC, and serial I/O onto one die. Within the PIC family hierarchy, the PIC16C74B belongs to the mid-range 8-bit core, situated between baseline (PIC10/12/14) and enhanced mid-range/PIC18 families. MCUs are foundational components in embedded systems, enabling deterministic real-time control in everything from consumer appliances to industrial automation.
Key features of the PIC16LC74B-04I/PT include 33 digital I/O lines, on-chip peripherals (typically including a USART, MSSP for SPI/I2C, capture/compare/PWM modules, and an 8-channel 8-bit ADC), and the low-power CMOS design typical of the LC family. The /I suffix designates the industrial temperature range (-40C to +85C), while /PT specifies the 44-lead Thin Quad Flat Pack (TQFP). The 4 MHz maximum oscillator frequency reflects the part's position in the early-2000s PIC16C generation.
Architecturally, the PIC16LC74B uses a Harvard-style 14-bit instruction word with separate program and data buses, providing deterministic single-cycle instruction execution (except branches). The 4 MHz oscillator yields a 1 microsecond instruction cycle, suitable for many control loops without external clock multiplication. The 33 I/O pins can be multiplexed across analog/digital functions and external interrupts.
Typical applications include industrial control boards, sensor signal conditioning and acquisition front-ends, low-power consumer appliances, simple motor control, and legacy embedded system maintenance. The OTP memory makes it suitable for low-volume production runs where mask-ROM economics do not apply.
When designing with this part, plan for OTP programming infrastructure, since OTP cannot be reprogrammed in-circuit after the cover-window seal is broken. Ensure decoupling (0.1 uF + 10 uF) is placed close to VDD/VSS pins, and verify that all unused I/O lines are configured as outputs low or inputs with pull-ups.
This page synthesizes verified distributor pricing, package-compatible drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
חלופות תחליף ישיר עבור PIC16LC74B-04I/PT — אותו מארז, תואם פין-לפין. חלקים במארז שונה הדורשים עיבוד מחדש של ה-PCB אינם נכללים.
וריאנטים בסדרה זו
דגמים מאותה סדרה התואמים Drop-in עם PIC16LC74B-04I/PT (אותו גורם צורה וטביעת רגל) — שונים ב Instruction Cycle Time, Timers, Mounting Type, Program Memory Size, Program Memory Type.
PIC16LC74B-04I/PQ
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16LC74A-04/PQ
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16C74B-04I/L
✅ Drop-Inצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16LC74B-04/PQ
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16LF74-I/PT
✅ Drop-In📋 חלופה להתייחסות (לא בקטלוג)
PIC16LC74B-04I/P
✅ Drop-In ⚠️ מפרטים לא מאומתיםצור קשר לקבלת מחיר
הצג גיליון נתונים ←PIC16LC74B-04I/PT דירוגים מרביים ומאפיינים חשמליים
| Core Architecture | PIC16C mid-range 8-bit RISC |
| Program Memory Size | 7 KB (4K x 14) OTP |
| Data Memory (RAM) | 192 bytes |
| תדר שעון מקסימלי | 4 MHz |
| Instruction Cycle Time | 1 us at 4 MHz |
| Supply Voltage Range | 2.5 V to 6.0 V |
| I/O Pins | 33 |
| Package Type | 44-TQFP (PT) |
| סוג הרכבה | Surface Mount |
| Temperature Range | -40C to +85C (Industrial, /I suffix) |
| ADC | 8-channel, 8-bit (per datasheet family) |
| USART | Yes (per datasheet family) |
| MSSP (SPI/I2C) | Yes (per datasheet family) |
| Capture/Compare/PWM | Yes (per datasheet family) |
| ROM Type | OTP (One-Time Programmable) |
תצורת פינים של PIC16LC74B-04I/PT
| פין 1 | OSC1/CLKIN — Oscillator crystal input or external clock input |
| פין 2 | RA0/AN0 — Port A bit 0 / Analog input 0 |
| פין 3 | RA1/AN1 — Port A bit 1 / Analog input 1 |
| פין 4 | RA2/AN2 — Port A bit 2 / Analog input 2 |
| פין 5 | RA3/AN3/VREF — Port A bit 3 / Analog input 3 / ADC reference |
| פין 6 | RA4/T0CKI — Port A bit 4 / Timer 0 clock input |
| פין 7 | RA5/AN4/SS — Port A bit 5 / Analog input 4 / SPI slave select |
| פין 8 | VSS — Ground reference |
| פין 9 | OSC2/CLKOUT — Oscillator crystal output / clock output |
| פין 10 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer 1 oscillator output / clock input |
| פין 11 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer 1 oscillator input / CCP2 |
| פין 12 | RC2/CCP1 — Port C bit 2 / Capture-Compare-PWM 1 |
| פין 13 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| פין 14 | RD0/PSP0 — Port D bit 0 / Parallel Slave Port bit 0 |
| פין 15 | RD1/PSP1 — Port D bit 1 / Parallel Slave Port bit 1 |
| פין 16 | RD2/PSP2 — Port D bit 2 / Parallel Slave Port bit 2 |
| פין 17 | RD3/PSP3 — Port D bit 3 / Parallel Slave Port bit 3 |
| פין 18 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| פין 19 | RC5/SDO — Port C bit 5 / SPI data out |
| פין 20 | RC6/TX/CK — Port C bit 6 / USART transmit / clock |
| פין 21 | RC7/RX/DT — Port C bit 7 / USART receive / data |
| פין 22 | RD4/PSP4 — Port D bit 4 / Parallel Slave Port bit 4 |
| פין 23 | RD5/PSP5 — Port D bit 5 / Parallel Slave Port bit 5 |
| פין 24 | RD6/PSP6 — Port D bit 6 / Parallel Slave Port bit 6 |
| פין 25 | RD7/PSP7 — Port D bit 7 / Parallel Slave Port bit 7 |
| פין 26 | VSS — Ground reference |
| פין 27 | VDD — Positive supply voltage |
| פין 28 | RB0/INT — Port B bit 0 / External interrupt |
| פין 29 | RB1 — Port B bit 1 |
| פין 30 | RB2 — Port B bit 2 |
| פין 31 | RB3 — Port B bit 3 |
| פין 32 | RB4 — Port B bit 4 |
| פין 33 | RB5 — Port B bit 5 |
| פין 34 | RB6/PGC — Port B bit 6 / In-circuit debugger clock |
| פין 35 | RB7/PGD — Port B bit 7 / In-circuit debugger data |
| פין 36 | RE0/RD/AN5 — Port E bit 0 / Read control / Analog input 5 |
| פין 37 | RE1/WR/AN6 — Port E bit 1 / Write control / Analog input 6 |
| פין 38 | RE2/CS/AN7 — Port E bit 2 / Chip select / Analog input 7 |
| פין 39 | VDD — Positive supply voltage |
| פין 40 | VSS — Ground reference |
| פין 41 | NC — Not connected (per datasheet) |
| פין 42 | NC — Not connected (per datasheet) |
| פין 43 | NC — Not connected (per datasheet) |
| פין 44 | MCLR/VPP — Master clear reset / Programming voltage input |
יישומים טיפוסיים
PIC16LC74B-04I/PT מתאים עבור 6 יישוםs: Industrial Control Boards, Sensor Signal Acquisition Front-Ends, Consumer Appliance Controllers, Legacy Embedded System Maintenance, Low-Power Remote Sensor Nodes, Educational and Training Platforms.
Industrial Control Boards
The PIC16LC74B-04I/PT's 4 MHz core and 33 I/O pins make it a workhorse for legacy industrial control applications such as sensor interfacing, relay driving, and contactor control. Its 2.5-6.0 V supply range tolerates noisy 5 V rails typical of factory-floor power, while the -40C to +85C industrial grade supports unconditioned enclosures. The 7 KB OTP memory accommodates multi-state control logic and lookup tables for protocol handling. According to the PIC16C73B/74B datasheet, on-chip peripherals include a USART and MSSP (SPI/I2C) for connecting to PLC backplanes, HMI displays, and sensor networks, while 8-channel 8-bit ADC handles analog transducer inputs. OTP keeps unit cost low for moderate production volumes.
מומלץ
Sensor Signal Acquisition Front-Ends
With its on-chip 8-channel 8-bit ADC and 33 I/O, the PIC16LC74B-04I/PT can directly digitize multiple analog sensors in instrumentation modules. At 4 MHz instruction rate, ADC conversions (approx 20 us per the datasheet) are fast enough for low-bandwidth temperature, pressure, and flow-rate measurements. The 1 microsecond instruction cycle enables simple digital filtering and linearization in firmware. The wide 2.5-6.0 V supply accommodates battery or bus-powered sensor nodes. Industrial temp grade supports outdoor or factory installations. The OTP memory and modest 192-byte RAM keep these modules inexpensive for high-volume deployments.
מומלץ
Consumer Appliance Controllers
The PIC16LC74B-04I/PT is well-suited for consumer appliances such as coffee machines, washing machines, microwave ovens, and HVAC controllers where cost dominates over performance. Its 33 I/O drive 7-segment displays, keypads, relay coils, and triac interfaces, while on-chip timers generate PWM for motor speed or heater regulation. The USART enables diagnostic ports or wireless module hookups. OTP memory keeps per-unit cost low for high-volume SKUs. Per the datasheet, the LC variant offers lower quiescent current than the C version, helping meet energy-star standby targets. Industrial temperature grade handles under-cabinet and garage installations.
מומלץ
Legacy Embedded System Maintenance
Many products designed in the late 1990s and 2000s use PIC16C/LC OTP microcontrollers, and the PIC16LC74B-04I/PT is still purchased for spare-part replacement and ongoing production of long-lifecycle equipment. Its exact 44-TQFP pinout lets it drop into existing PCBs without rework. Industrial temp grade and proven reliability mean the part is favored in medical, aerospace, and military systems that must remain in service for decades. Where firmware bugs are discovered, OTP cannot be reprogrammed - so design revisions typically migrate to flash-based PIC16F74 or PIC16F1xxx families. For exact replica production, the LC OTP variant is preferred.
מומלץ
Low-Power Remote Sensor Nodes
The PIC16LC74B-04I/PT's LC (low-power CMOS) process and 2.5-6.0 V supply make it suitable for battery-powered remote sensors transmitting over RS-485 or proprietary RF links. With sleep current typically under 10 uA (per datasheet family), it can wake periodically, sample sensors via its 8-channel ADC, and transmit via USART before returning to sleep. The 1 us instruction cycle is sufficient for simple averaging and threshold detection. Industrial temperature grade handles outdoor enclosures. OTP memory provides protection against firmware tampering in deployed sensor networks. Solar or lithium-thionyl-chloride battery packs can power the node for years.
מומלץ
Educational and Training Platforms
The PIC16LC74B-04I/PT's mature toolchain (MPLAB X IDE, XC8 compiler, PICkit programmers) and abundant educational resources make it useful for university embedded-systems courses. Its 33 I/O support a wide range of peripheral exercises - LEDs, switches, UART terminals, SPI/I2C sensors, ADC inputs, PWM outputs. The 7 KB OTP forces careful memory budgeting, which is good pedagogical discipline. Industrial temp grade is forgiving of student lab environments. While modern courses prefer flash-based PIC16F or PIC18 parts, the LC OTP variant is excellent for understanding OTP programming flow, including UV-erase window behavior on windowed packages.
מומלץ
סיכום מוצרים מומלצים
נתוני עזר הנדסיים עבור PIC16LC74B-04I/PT — השוואה, הנחיות תכנון ומידע על תאימות.
מדריך בחירה
השוואה עם חלופות
| פרמטר | מוצר זה | PIC16LC74B-04I/PQ | PIC16LC74A-04/PQ | PIC16C74B-04I/L | PIC16LC74B-04/PQ | PIC16LF74-I/PT | PIC16LC74B-04I/P |
|---|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 44-TQFP (PT) | 44-MQFP (PQ) | 44-MQFP (PQ) | 44-PLCC (L) | 44-MQFP (PQ) | 44-TQFP (PT) | 40-PDIP (P) |
| Program Memory | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB OTP | 7 KB Flash | 7 KB OTP |
| RAM | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes | 192 bytes |
| Maximum Clock | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 4 MHz |
| Supply Voltage | 2.5-6.0 V | 2.5-6.0 V | 2.5-6.0 V | 4.0-6.0 V | 2.5-6.0 V | 2.0-6.0 V | 2.5-6.0 V |
| Temperature Range | -40C to +85C (I-grade) | -40C to +85C | -40C to +85C | -40C to +85C | 0C to +70C (commercial) | -40C to +85C | -40C to +85C |
| Memory Type | OTP | OTP | OTP | OTP | OTP | Flash (reprogrammable) | OTP |
| I/O Pins | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
מבדילים עיקריים
- Low-power CMOS process reduces quiescent current (לעומתPIC16C74B-04I/L)
- Reprogrammable memory for development and field updates (לעומתPIC16LF74-I/PT)
- Compact TQFP package for space-constrained designs (לעומתPIC16LC74B-04I/P)
הערות תכנון
Place a 0.1 uF ceramic decoupling capacitor as close as possible to each VDD pin (pins 27 and 39 on the 44-TQFP), with a bulk 10 uF tantalum or aluminum capacitor at the board-level VDD entry. The PIC16LC74B-04I/PT operates over 2.5-6.0 V; ensure VDD rise time is less than 50 ms to guarantee proper Power-On Reset (POR). Add bulk capacitance if the supply is shared with high-current peripherals. Per Microchip PIC16C73B/74B datasheet recommendations, VDD must stabilize before the oscillator starts to avoid undefined reset states.
OTP memory cannot be erased or reprogrammed - once programmed, the PIC16LC74B-04I/PT is fixed. Verify firmware using a windowed or sample device before committing to OTP units. For development, use PIC16F74 (Flash variant) which shares the same pinout and peripherals. Always tie MCLR/VPP high through a 10 kohm resistor with a 100 nF decoupling cap; do not leave MCLR floating. Configure all unused I/O pins as outputs low or inputs with internal weak pull-ups enabled to minimize current draw.
Route the crystal/oscillator traces (OSC1 pin 1, OSC2 pin 9) short and symmetric, with ground guard traces around the crystal network. The 44-TQFP has its pins on all four sides with 0.80 mm pitch - allow adequate breakout room on inner PCB layers. Place the ICSP connector (PGC on RB6 pin 34, PGD on RB7 pin 35, MCLR/VPP on pin 44) so it does not require pin extensions for in-circuit programming. Reference: Microchip PIC16C73B/74B datasheet section on 'Oscillator Design'.
מידע על תאימות
RoHS/REACH/lead-free status not confirmed in verified data; PIC16C/LC family typically pre-dates RoHS standardization for many variants. Industrial /I temperature grade is per the PIC16C73B/74B datasheet family specification.