PIC16LC66T-04I/SO - 8-bit MCU, 14KB OTP, 4MHz, 28-SOIC | Microchip
MPN: PIC16LC66T-04I/SO ✓ Hoạt độngPIC16LC66T-04I/SO Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, RAM, non-volatile program memory, and peripherals such as timers, ADC, and I/O. PIC microcontrollers use a Harvard RISC architecture with a small, fixed instruction set, making them popular for embedded control, instrumentation, and legacy industrial systems. Within the broader semiconductor taxonomy, the PIC16LC66 sits at: 8-bit MCU -> microcontroller -> embedded processor -> semiconductor IC. Its ultra-low-power CMOS design positions it as a fit for battery-backed and power-constrained applications versus standard PIC16C6X parts.
Key features include 22 digital I/O pins organized across multiple ports (Port A, B, C), three timers (Timer0 8-bit with prescaler, Timer1 16-bit with sleep-mode crystal increment, Timer2 8-bit), a capture/compare/PWM (CCP) module, a 5-channel 8-bit ADC, and a universal synchronous/asynchronous receiver-transmitter (USART/SCI). The OTP program memory allows one-time factory or field programming, while 368 bytes of data RAM support runtime variables and stack operations.
Typical applications include industrial sensor interfaces, low-power remote controls, appliance controllers, building automation nodes, white-goods motor control, simple HMI panels, and legacy embedded control boards. The 28-SOIC package supports surface-mount assembly, enabling compact PCB designs in space-constrained products.
When designing with this part, ensure that code density and stack depth fit within 14KB / 8-level hardware stack. The PIC16LC66 uses One-Time Programmable memory, so firmware revisions require physical device replacement; consider PIC16F66 for Flash-based upgrades on the same pinout.
This page synthesizes distributor pricing, drop-in alternatives from the same PIC16C6X family, and practical design notes not found in a quick-datasheet summary. All pricing is quoted as of 2026-09-22.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC66T-04I/SO — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với PIC16LC66T-04I/SO (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Size, Core Architecture, Timers, Mounting Type.
PIC16LC66-04I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC66-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F66-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16C66-04I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC66T-04I/SO Tỷ lệ tối đa & tính chất điện
| Manufacturer | Microchip Technology |
| Series | PIC® 16C |
| Core Architecture | 8-bit RISC (Harvard) |
| Core Processor | PIC16C6X |
| Maximum Clock Speed | 4 MHz |
| Program Memory Type | OTP (One-Time Programmable) |
| Program Memory Size | 14 KB (8K x 14) |
| Data RAM | 368 bytes |
| I/O Pins | 22 |
| Supply Voltage Range | 2.5 V to 5.5 V |
| Nhiệt độ hoạt động | -40 °C to +85 °C (Industrial) |
| Hộp | 28-SOIC (0.295", 7.50 mm width) |
| Kiểu lắp đặt | Surface Mount |
| Timers | Timer0 (8-bit) + Timer1 (16-bit) + Timer2 (8-bit) |
| Communication | USART/SCI |
| Packaging Type | Tape & Reel ("T" suffix) |
Cấu hình chân PIC16LC66T-04I/SO
| Chân 1 | RA2/AN2/VREF- — Port A bit 2 / ADC channel 2 / ADC negative reference |
| Chân 2 | RA3/AN3/VREF+ — Port A bit 3 / ADC channel 3 / ADC positive reference |
| Chân 3 | RA4/T0CKI — Port A bit 4 / Timer0 clock input |
| Chân 4 | RA5/AN4/SS — Port A bit 5 / ADC channel 4 / SPI slave select |
| Chân 5 | OSC1/CLKIN — Crystal oscillator input / external clock input |
| Chân 6 | OSC2/CLKOUT — Crystal oscillator output / clock output |
| Chân 7 | RC0/T1OSO/T1CKI — Port C bit 0 / Timer1 oscillator output / Timer1 clock input |
| Chân 8 | RC1/T1OSI/CCP2 — Port C bit 1 / Timer1 oscillator input / CCP2 |
| Chân 9 | RC2/CCP1 — Port C bit 2 / CCP1 PWM/capture/compare |
| Chân 10 | RC3/SCK/SCL — Port C bit 3 / SPI clock / I2C clock |
| Chân 11 | RC4/SDI/SDA — Port C bit 4 / SPI data in / I2C data |
| Chân 12 | RC5/SDO — Port C bit 5 / SPI data out |
| Chân 13 | RC6/TX/CK — Port C bit 6 / USART TX / USART clock |
| Chân 14 | RC7/RX/DT — Port C bit 7 / USART RX / USART data |
| Chân 15 | VSS — Ground reference |
| Chân 16 | VDD — Positive supply (2.5V to 5.5V) |
| Chân 17 | RB0/INT — Port B bit 0 / external interrupt |
| Chân 18 | RB1 — Port B bit 1 |
| Chân 19 | RB2 — Port B bit 2 |
| Chân 20 | RB3/PGM — Port B bit 3 / LVP programming |
| Chân 21 | RB4 — Port B bit 4 |
| Chân 22 | RB5 — Port B bit 5 |
| Chân 23 | RB6/PGC — Port B bit 6 / ICSP clock |
| Chân 24 | RB7/PGD — Port B bit 7 / ICSP data |
| Chân 25 | RA0/AN0 — Port A bit 0 / ADC channel 0 |
| Chân 26 | RA1/AN1 — Port A bit 1 / ADC channel 1 |
| Chân 27 | MCLR/VPP — Master clear reset / programming voltage |
| Chân 28 | VSS — Ground reference |
Ứng dụng tiêu biểu
PIC16LC66T-04I/SO phù hợp cho 6 Áp dụngs: Industrial Sensor Interface Node, Battery-Backed Remote Control, White-Goods Appliance Controller, Building Automation Node, Simple HMI Display Panel, Legacy Embedded Control Board Replacement.
Industrial Sensor Interface Node
The PIC16LC66T-04I/SO's 2.5 V to 5.5 V low-voltage CMOS operation, 8-bit ADC, and 22 digital I/O make it a strong fit for industrial sensor interface nodes that read analog sensors and forward processed data via USART. Industrial-grade -40°C to +85C operation handles factory-floor temperature swings. The 14 KB OTP memory holds protocol stacks for Modbus RTU, simple state machines, and calibration tables. Estimated: at 4 MHz clock and typical sensor sampling loops, code easily fits 14 KB and 368 bytes RAM is sufficient for protocol buffers.
Được đề xuất
Battery-Backed Remote Control
The PIC16LC66T-04I/SO's "LC" low-voltage CMOS process supports operation down to 2.5 V, ideal for 2xAA or coin-cell battery-powered remote controls. Timer1 with external crystal increment during sleep enables RTC-style wake-up with microamp quiescent current. The 22 I/O drive LED indicators, keypads, and IR transmitters; the USART/SCI provides wired comms to a base station. Estimated: at 4 MHz active and <1% duty cycle, average current draw is well under 100 uA, supporting multi-year battery life.
Được đề xuất
White-Goods Appliance Controller
The PIC16LC66T-04I/SO is widely deployed in legacy washing-machine, dishwasher, and refrigerator control boards where the OTP memory and industrial temperature grade provide long-life reliability. The CCP module drives PWM outputs for motor and valve control, while the 8-bit ADC reads temperature, water level, and motor-current sensors. The 28-SOIC package is compatible with high-volume SMT assembly lines. According to the PIC16C6X datasheet, brown-out reset and watchdog timer are integrated, supporting IEC 60730 class B safety requirements for appliance control.
Được đề xuất
Building Automation Node
The PIC16LC66T-04I/SO's USART/SCI, 22 I/O, and industrial temperature range make it suitable for HVAC zoning nodes, lighting controllers, and access-control sub-modules in building automation. The 14 KB OTP memory fits BACnet/Modbus slave stacks and relay-control logic, while the 8-bit ADC reads analog sensors (light, temperature, CO2). Estimated: typical building-automation node code is 6-10 KB, leaving 4 KB+ headroom in 14 KB OTP. Brown-out reset is critical for HVAC applications with unstable power.
Được đề xuất
Simple HMI Display Panel
The PIC16LC66T-04I/SO drives small character-LCD or 7-segment LED displays in simple human-machine-interface panels such as instrument readouts, kiosk keypads, and vending-machine selectors. The CCP module generates PWM for LED backlight dimming, while the 8-bit ADC reads user potentiometers or touch sensors. The 22 I/O pins are sufficient to drive a 4x4 keypad and 8-digit 7-segment display via BCD decoders. The 28-SOIC footprint is easily laid out on a 2-layer PCB.
Được đề xuất
Legacy Embedded Control Board Replacement
The PIC16LC66T-04I/SO is often specified for legacy industrial control board repair and re-manufacturing, where original equipment manufacturers must source the same silicon and footprint. The "T" tape-and-reel suffix supports modern SMT re-assembly; same 28-SOIC JEDEC footprint allows direct PCB drop-in. According to Microchip, the PIC16LC66 family has been in production for decades and remains ACTIVE (as of 2026-09-22), making it suitable for industrial OEMs with 10-20 year product support commitments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC66T-04I/SO — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | PIC16LC66-04I/SO | PIC16LC66-04/SO | PIC16F66-I/SO | PIC16C66-04I/SO | PIC16LC66-04I/SP |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 28-SOIC (0.295") | 28-SOIC (0.295") - same | 28-SOIC (0.295") - same | 28-SOIC (0.295") - same | 28-SOIC (0.295") - same | 28-SPDIP (0.300") - different footprint |
| Core Architecture | 8-bit PIC RISC | 8-bit PIC RISC | 8-bit PIC RISC | 8-bit PIC RISC | 8-bit PIC RISC | 8-bit PIC RISC |
| Max Clock Speed | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 4 MHz | 4 MHz |
| Program Memory | 14 KB OTP | 14 KB OTP | 14 KB OTP | 14 KB Flash | 14 KB OTP | 14 KB OTP |
| Data RAM | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 368 bytes | 368 bytes |
| Supply Voltage Range | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.5 V to 5.5 V | 2.0 V to 5.5 V | 4.0 V to 6.0 V | 2.5 V to 5.5 V |
| Operating Temperature | -40°C to +85°C (Industrial) | -40°C to +85°C | 0°C to +70°C | -40°C to +85°C | -40°C to +85°C | -40°C to +85°C |
| I/O Pins | 22 | 22 | 22 | 22 | 22 | 22 |
Bảo phân biệt quan trọng
- Low-voltage CMOS ("LC") process variant (vsPIC16C66-04I/SO)
- Tape-and-reel packaging ("T" suffix) for high-volume SMT (vsPIC16LC66-04I/SO)
- Industrial temperature grade (-40°C to +85°C) (vsPIC16LC66-04/SO)
- OTP memory for low per-unit cost and security (vsPIC16F66-I/SO)
Ghi chú thiết kế
The PIC16LC66T-04I/SO "LC" variant supports 2.5 V to 5.5 V operation versus 4.0 V to 6.0 V for the original PIC16C66. For designs migrating between the two, confirm brown-out-reset thresholds in the electrical characteristics table and verify that any 5 V-only peripherals are tolerant of the lower Vdd. A 100 nF decoupling capacitor must be placed within 5 mm of the VDD pin (pin 16) with a low-impedance ground return to pin 15 or 28; add a bulk 10 uF tantalum or ceramic near the IC. Estimated: at 4 MHz clock and 5 V supply, active current is approximately 2 mA per the PIC16C6X datasheet family curves.
The PIC16LC66T-04I/SO uses OTP (One-Time Programmable) memory, not Flash. Once programmed, the firmware cannot be erased or rewritten. For prototypes and design iterations, use the Flash-based PIC16F66-I/SO or PIC16F877A in the same development environment; do not waste OTP parts during bring-up. The MCLR pin (pin 27) requires a 10 kohm pull-up to VDD; if left floating, the device will randomly enter reset. The ICSP clock (RB6/PGC, pin 23) and ICSP data (RB7/PGD, pin 24) must be accessible in the final PCB layout to allow factory programming.
The 28-SOIC package uses the JEDEC MS-013 standard footprint with 1.27 mm pin pitch and 7.50 mm body width. Reserve at least 0.5 mm clearance between the SOIC body and adjacent traces for pick-and-place nozzles. Decoupling: place a 100 nF X7R ceramic between VDD (pin 16) and VSS (pin 15 or 28) with trace length under 2 mm. The crystal oscillator pins (OSC1/CLKIN pin 5, OSC2/CLKOUT pin 6) should be guarded with a ground ring; keep crystal traces short and symmetric to avoid EMI. Estimated: SOIC thermal resistance theta_JA is approximately 70 C/W in still air, sufficient for the 2 mA active current at 4 MHz without heatsinking.
The 8-bit ADC on the PIC16LC66T-04I/SO has 5 channels multiplexed to RA0-RA4. To achieve rated ADC accuracy, the source impedance should be under 10 kohm, and acquisition time should follow the PIC16C6X datasheet equation (typically 19.7 us minimum at 4 MHz). For noisy analog inputs (e.g., motor current sensing), add an external RC filter (1 kohm + 100 nF = 10 kHz cutoff) and average multiple ADC readings in firmware. The analog reference pins (RA3/VREF+ pin 2, RA2/VREF- pin 1) should be bypassed with 100 nF capacitors; use a low-noise reference such as MCP1525 for precision measurements.
Thông tin tuân thủ
Lead-free finish is standard per Microchip's product page; explicit RoHS/REACH certificates require request to Microchip. Not AEC-Q100 qualified (not an automotive-grade MCU). [DATA_NEEDED: latest RoHS/REACH compliance certificate from Microchip]
