PIC16F74T-I/L - 8-Bit 20MHz Flash MCU | Microchip
MPN： PIC16F74T-I/L ✗ 停產PIC16F74T-I/L 概覽
A microcontroller is a programmable integrated circuit that combines a processor core, memory, I/O, and peripherals on one semiconductor device. The PIC16F74 belongs to the PIC16 8-bit microcontroller family and executes a compact instruction set with 200 ns instruction execution. Its architecture is upward-compatible with the PIC16C5X, PIC12CXXX, and PIC16C7X device families, making it useful when engineers want to retain familiar programming and peripheral concepts while moving to nonvolatile flash program memory.
Verified device features include eight 8-bit analog-to-digital converter channels plus two additional comparator channels, 33 I/O pins, and 7 KB of flash program memory. The 20 MHz operating capability provides faster control-loop and serial-communication headroom than lower-speed PIC16 devices. The 44-pin PLCC provides more I/O and analog access than 28-pin alternatives, while its leaded ceramic package is mechanically distinct from surface-mount alternatives.
The PIC16F74T-I/L integrates control-oriented digital I/O with an ADC and comparators, allowing a single device to supervise sensors, process switching inputs, drive indicators or actuators, and implement embedded control logic. Its 192-byte RAM provides working memory for variables, stack activity, and intermediate calculations, while the 4K x 14-word flash organization supports a 14-bit program word.
The 44-pin PLCC footprint requires attention to component orientation, lead pitch, solderability, and assembly tooling. Unlike a modern QFN or plastic LQFP MCU, this part uses a larger leaded footprint with exposed soldering surfaces on all four sides. A migration candidate must therefore preserve both pin function and the exact package land pattern rather than relying only on memory and clock specifications.
Typical uses include industrial monitoring, environmental data acquisition, laboratory control, building controls, appliance interfaces, and legacy peripheral-controller upgrades. Designers should use the Microchip PIC16F73/4/6/7 datasheet and the exact package drawing for pin assignment, programming, decoupling, timing, and layout decisions. This page combines verified distributor and manufacturer information with procurement guidance and clearly marks parameters that require confirmation.
直接替換替代品，適用於 PIC16F74T-I/L — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： PIC16F74T-I/L （相同外形與佔位） — 差異在於 Package, Core Architecture, Program Memory, Serial Interfaces, I/O Pins.
PIC16F74T-I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16F74-I/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16F74T-E/L
✅ 直接替換聯絡詢價
查看資料表 →PIC16F74-I/PT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC16F74T-I/PT
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →PIC16F74T-I/L 最大額定值與電氣特性
| Product Type | 8-bit CMOS flash-based microcontroller |
| Architecture | PIC16 8-bit RISC architecture |
| 最大時脈頻率 | 20 MHz |
| Instruction Execution Time | 200 ns |
| Instruction Set | 35 single-word instructions |
| Program Memory | 7 KB flash organized as 4K x 14 words |
| RAM | 192 bytes |
| I/O Pins | 33 |
| ADC Channels | 8 channels of 8-bit analog-to-digital conversion |
| Additional Analog Channels | 2 additional comparator channels |
| 封裝 | 44-pin PLCC, 16.59 mm x 16.59 mm |
| 安裝類型 | Surface-mount leaded ceramic package |
| Architecture Compatibility | Upward-compatible with PIC16C5X, PIC12CXXX, and PIC16C7X devices |
PIC16F74T-I/L 44-pin plcc, 16.59 mm x 16.59 mm 腳位配置指南
PIC16F74T-I/L（44-pin plcc, 16.59 mm x 16.59 mm 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： PIC16F74T-I/L.
請參閱 資料表 以查看完整腳位配置。
典型應用
PIC16F74T-I/L 適用於 6 應用s: Industrial Sensor Interface, Environmental Data Acquisition, Building Control Module, Laboratory Instrument Control, Appliance Control, Legacy Peripheral Controller Upgrade.
Industrial Sensor Interface
PIC16F74T-I/L fits an industrial sensor interface because it provides eight 8-bit ADC channels, two additional comparator channels, and 33 I/O pins for switches, indicators, and actuators. According to Microchip, the device supports 20 MHz operation and 200 ns instruction execution, allowing the firmware to scan inputs and update outputs at practical control rates. Use the ADC channels for transducers with compatible signal ranges and comparator channels for simple threshold events. Its 192-byte RAM can hold recent measurements, state flags, and intermediate calculations. Because the exact industrial temperature limits and analog input electrical limits are not supplied, engineers must confirm them in the manufacturer datasheet before approving the module for field use.
推薦
Environmental Data Acquisition
PIC16F74T-I/L is appropriate for a compact environmental data-acquisition controller where several analog sensors must be sampled and digital status lines must be coordinated. The verified device provides eight 8-bit ADC channels, two additional comparator channels, 33 I/O pins, 192 bytes of RAM, and a 20 MHz maximum clock. Its flash program memory totals 7 KB, organized as 4K x 14 words, which is sufficient for focused acquisition, filtering, thresholding, and local status functions when firmware is kept economical. The MCU can implement periodic sampling without adding a separate analog mux. Designers should still verify the ADC reference, sample-and-hold behavior, acquisition timing, and operating-temperature limits in the complete Microchip datasheet.
推薦
Building Control Module
PIC16F74T-I/L can serve as the local controller in a building-control module that reads inputs and coordinates relays, indicators, or actuator drivers. Its 33 I/O pins provide substantial parallel connectivity, while the eight-channel 8-bit ADC supports monitoring of analog sensing lines. According to Microchip, the 20 MHz architecture executes instructions in as little as 200 ns, helping the firmware combine input scanning, debounce logic, state machines, and communications tasks. The 192-byte RAM supports runtime variables and communication buffers, although 7 KB of flash requires disciplined code organization. Loads should be driven through suitable transistor or driver stages rather than directly from MCU pins, and mains-related isolation must be designed outside the microcontroller package.
推薦
Laboratory Instrument Control
PIC16F74T-I/L is well suited to legacy laboratory instrument control because its combination of flash memory, 192 bytes of RAM, 33 I/O pins, and analog conversion resources supports standalone sequencing. At a 20 MHz maximum clock, the processor can manage front-panel states, execute test sequences, and report results through discrete or serial interfaces. Compared with a feature-rich modern MCU, its 7 KB program memory and 192-byte RAM are modest, so the design should use concise routines and avoid unnecessary abstraction. The verified information does not establish a laboratory temperature rating or EMC qualification. Instrument designers should therefore verify environmental requirements, grounding, analog isolation, and creepage separately rather than inferring them from the device family name.
推薦
Appliance Control
PIC16F74T-I/L can coordinate appliance functions such as button inputs, display states, temperature-related decisions, and controlled outputs. Its 33 I/O pins reduce the need for large I/O expansion networks, while the ADC and comparator resources can support analog front ends used in appliance products. The 20 MHz clock offers ample headroom for a state-machine-based controller, and 7 KB of flash can store compact application firmware. The 192-byte RAM is more constrained than current general-purpose MCUs, so buffers should be sized deliberately. The exact temperature grade represented by the I suffix must be checked against the appliance enclosure's ambient range. High-current heaters, compressors, and motors should use isolated driver circuitry, not direct MCU outputs.
推薦
Legacy Peripheral Controller Upgrade
PIC16F74T-I/L is especially relevant when maintaining a PIC16C7X-era peripheral controller that must move from older nonvolatile-memory technology to flash while retaining a familiar architecture. Microchip describes the PIC16F74 as upward-compatible with PIC16C5X, PIC12CXXX, and PIC16C7X devices, which can reduce firmware-learning effort. Its 20 MHz clock, 4K x 14-word program memory, 192-byte RAM, and eight ADC channels provide a practical control platform. Nevertheless, upward compatibility is not blanket peripheral equivalence. Before replacing the MCU, engineers should compare pin functions, oscillator configuration, interrupt behavior, I/O electrical limits, memory maps, and programming tools. The 44-pin PLCC land pattern must also be matched exactly.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16F74T-I/L — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | PIC16F74-I/L | PIC16F74T-E/L | PIC16F74-I/PT | PIC16F74T-I/PT |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
主要差異化特點
- Exact 44-pin PLCC continuity (對比PIC16F74-I/L)
- Documented control resources (對比PIC16F74T-E/L)
- Established PIC16 firmware compatibility path (對比PIC16F877A-I/L)
設計說明
Use the exact 44-pin PLCC land pattern and orientation from Microchip rather than adapting a generic PLCC drawing from an unrelated MCU. Verify pad length, lead pitch, solder mask, courtyard, and the package pin-1 orientation against the exact family package drawing. The verified dimensions are 16.59 mm by 16.59 mm, but those dimensions alone do not define every land-pattern detail.
Separate analog inputs and references from digital switching nodes and high-current return paths. Route sensor traces away from relay drivers, clock edges, and power-converter nodes where practical. If ADC inputs are long or high impedance, keep the source impedance and acquisition timing within the limits of the manufacturer datasheet. The supplied search data does not provide the full ADC acquisition-cycle table, so it must be consulted directly.
Do not treat upward architecture compatibility as proof that a legacy design can replace its MCU without review. Compare oscillator pins, I/O direction and analog functions, interrupt sources, peripheral registers, memory organization, and programming-device requirements. PIC16F74T-I/L uses 7 KB flash organized as 4K x 14 words, so assembly or compiler assumptions inherited from a different 8-bit architecture can fail even when the application concept is similar.
Place the manufacturer's required bypass capacitors close to the appropriate supply pins and provide clean return paths for analog and digital currents. Because the verified excerpts do not state the operating voltage, decoupling value, ADC reference requirement, or total current limits, do not derive those values from a generic PIC16 design. Confirm them in the PIC16F73/4/6/7 datasheet and the exact device electrical tables before releasing power to the PCB.
合規資訊
The supplied verified excerpts do not state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification status. AEC-Q100 is not applicable unless Microchip documents an automotive-qualified ordering configuration for this exact MPN.
