PIC16LC621T-04/SO - 8-Bit PIC MCU, 4MHz, 1.75KB OTP | Microchip
MPN: PIC16LC621T-04/SO ✓ Hoạt độngPIC16LC621T-04/SO Tóm tắt
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, working RAM, and configurable I/O peripherals. The PIC16C family from Microchip is built on a Harvard-architecture RISC core with separate program and data buses, 12-bit-wide instructions and an 8-bit-wide data path. Inside the PIC16LC621 the core is paired with seven (or eight) special-function hardware registers, a two-level-deep hardware stack, and direct/indirect/relative addressing modes that map efficiently onto compiled C and assembly source.
Key features include a 4 MHz maximum clock, 12 CMOS-compatible I/O lines, OTP program memory suited to fixed-code production runs, internal oscillator support, and power-saving SLEEP mode. The 'LC' supply range of 2.5 V to 6.25 V lets the part run directly from a 3.3 V or 5 V rail without a separate regulator. Compared with flash-based PIC16F parts, the OTP variant reduces unit cost in mature, code-stable products where in-field firmware updates are not required.
Typical applications include appliance controls, sensor signal conditioning, low-end remote keyless entry transmitters, automotive body modules, and simple logic-replacement glue. The 18-SOIC footprint remains popular for through-hole-free board designs that migrate from DIP-18 prototypes.
When designing with this device, observe the maximum clock versus supply-voltage derating in the datasheet, keep RESET/MCLR decoupling tight, and reserve the OTP programmer footprint on first-article builds. Migration to the flash-based PIC16F627 (same pinout) is recommended for new designs that need firmware iteration.
This page synthesises distributor pricing, drop-in same-package alternatives, and engineering design notes for the PIC16LC621T-04/SO that are not found in a single manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC621T-04/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 PIC16LC621T-04/SO (cùng hình factor và footprint) — khác nhau ở Package, Program Memory Size, Program Memory Type, RAM Size, I/O Pins.
PIC16LC621A-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC621AT-04I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC621-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC621T-04I/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F627-I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F628-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC621T-04/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC 8-bit RISC (Harvard) |
| Core Size | 8-bit |
| Series | PIC 16C |
| Maximum Clock Speed | 4 MHz |
| Program Memory Size | 1.75 KB (1K x 14) OTP |
| RAM Size | 80 bytes |
| Supply Voltage Range | 2.5 V to 6.25 V |
| Number of I/O Pins | 13 (12 per alternate source listings) |
| Hộp | 18-pin SOIC (SO-18, 0.300 inch) |
| Kiểu lắp đặt | Surface Mount |
| Instruction Word Width | 12-bit |
| Hardware Stack Depth | 2 levels |
| Kiểu bộ nhớ | OTP (One-Time Programmable) |
Cấu hình chân PIC16LC621T-04/SO
| Chân 1 | RA2 — Bidirectional I/O port A bit 2 |
| Chân 2 | RA3 — Bidirectional I/O port A bit 3 |
| Chân 3 | RA4/T0CKI — I/O port A bit 4 / Timer0 clock input |
| Chân 4 | MCLR/VPP — Master Clear reset (active low) / Programming voltage input |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RB0/INT — I/O port B bit 0 / External interrupt input |
| Chân 7 | RB1 — Bidirectional I/O port B bit 1 |
| Chân 8 | RB2 — Bidirectional I/O port B bit 2 |
| Chân 9 | RB3 — Bidirectional I/O port B bit 3 |
| Chân 10 | RB4 — Bidirectional I/O port B bit 4 |
| Chân 11 | RB5 — Bidirectional I/O port B bit 5 |
| Chân 12 | RB6 — I/O port B bit 6 / ICSP clock |
| Chân 13 | RB7 — I/O port B bit 7 / ICSP data |
| Chân 14 | VDD — Positive supply voltage (2.5 V to 6.25 V) |
| Chân 15 | OSC2/CLKOUT — Oscillator crystal output / Clock output |
| Chân 16 | OSC1/CLKIN — Oscillator crystal input / External clock input |
| Chân 17 | RA0 — Bidirectional I/O port A bit 0 |
| Chân 18 | RA1 — Bidirectional I/O port A bit 1 |
Ứng dụng tiêu biểu
PIC16LC621T-04/SO phù hợp cho 7 Áp dụngs: Appliance Control Boards, Remote Keyless Entry (RKE) Transmitters, Automotive Body Modules, Sensor Signal Conditioning, Logic Replacement / Glue Controller, Low-End Consumer Electronics, Industrial Control Panels (HMI).
Appliance Control Boards
The PIC16LC621T-04/SO's 1.75 KB OTP program memory and 13 CMOS I/O lines fit appliance controls such as washing-machine front panels, microwave user interfaces and small kitchen appliances. The 4 MHz core delivers enough MIPS for keypad scanning, LED multiplexing and basic relay timing, while OTP keeps the per-unit cost low in high-volume SKUs. Operating from 2.5 V to 6.25 V lets the part share a 5 V or 3.3 V rail with the rest of the appliance's analog circuitry, simplifying the BOM. Designers should reserve the ICSP pins (RB6/RB7 + MCLR) so first-article boards can be programmed before OTP locking.
Được đề xuất
Remote Keyless Entry (RKE) Transmitters
The PIC16LC621T-04/SO is well matched to low-end RKE transmitter keyfobs where low cost, low standby current and a small 18-SOIC footprint outweigh the need for in-field firmware updates. SLEEP mode plus the 2.5-6.25 V supply range lets the part run directly from a CR2032 coin cell for multi-year battery life. The OTP memory locks the rolling-code algorithm at production, preventing firmware tampering, and 13 I/O pins are sufficient for 4-5 button inputs plus an LED indicator and SAW-transmitter enable line.
Được đề xuất
Automotive Body Modules
For non-safety automotive body functions (interior lighting controllers, mirror-adjust modules, seat-position switches) the PIC16LC621T-04/SO provides adequate processing at the lowest BOM cost. The wide 2.5 V to 6.25 V supply tolerance survives 12 V automotive transients when paired with an external TVS clamp. For AEC-Q100 qualified designs engineers should migrate to the PIC16LC621AT-04I/SO industrial-grade variant, which shares the same 18-SOIC footprint and is qualified to higher automotive reliability standards. OTP memory is acceptable because body-module firmware rarely changes once the part is in production.
Được đề xuất
Sensor Signal Conditioning
The PIC16LC621T-04/SO serves as a low-cost front-end controller for sensor signal conditioning boards (thermistor linearisation, NTC thermometry, simple 4-20 mA loop trim). The 13 I/O pins handle multiplexed analog switch control, reference voltage switching and a one-wire UART output back to a host PLC. The 1.75 KB OTP accommodates calibration lookup tables for a few sensor types, while the 4 MHz core runs the linearisation math in real time at typical loop rates of 100 Hz to 1 kHz. Operating from a 3.3 V or 5 V loop supply, the part avoids the cost of an extra LDO on the sensor board.
Được đề xuất
Logic Replacement / Glue Controller
Designers often drop a PIC16LC621T-04/SO onto a board to replace a handful of 74HC logic gates and a discrete timing RC network. The 1.75 KB OTP stores a custom state machine that handles power-up sequencing, watchdog timing and interlock logic in one 18-SOIC package. The 2.5-6.25 V supply range lets the MCU share the existing 3.3 V or 5 V logic rail with no extra regulator. OTP ensures the logic-replacement firmware is locked at production, simplifying end-product certification.
Được đề xuất
Low-End Consumer Electronics
The PIC16LC621T-04/SO fits low-end consumer products such as electronic toys, novelty LED gadgets, simple remote controls and personal-care devices. The 4 MHz core runs PWM for LED dimming and tone generation for piezo buzzers, while 13 I/O pins drive keypad scanning and segment-LCD multiplexing via external transistors. OTP keeps the unit cost low enough for sub-USD 10 retail products, and the 18-SOIC footprint is friendly to small two-layer PCBs. Designers should reserve the ICSP header on prototype runs to enable last-minute firmware tweaks before OTP lockdown.
Được đề xuất
Industrial Control Panels (HMI)
The PIC16LC621T-04/SO is used in operator-interface panels where it scans a small matrix keypad, drives a multiplexed seven-segment display and communicates with a host PLC over UART or RS-485. The 4 MHz core and 1 MIPS throughput comfortably handle 4-digit multiplexed displays at > 100 Hz refresh, eliminating visible flicker. The 2.5-6.25 V supply lets the MCU run from the same 24 V-to-5 V rail as the rest of the panel electronics. For panels that may need firmware updates the PIC16F627-I/SO is the recommended flash-based drop-in replacement in the same 18-SOIC footprint.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC621T-04/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 | PIC16LC621A-04/SO | PIC16LC621AT-04I/SO | PIC16LC621-04/SO | PIC16LC621T-04I/SO | PIC16F627-I/SO | PIC16F628-04/SO |
|---|---|---|---|---|---|---|---|
| Package | 18-SOIC (SO-18) | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core / Series | 8-bit PIC 16C | 8-bit PIC 16C | 8-bit PIC 16C | 8-bit PIC 16C | 8-bit PIC 16C | 8-bit PIC 16F (flash) | 8-bit PIC 16F (flash) |
| Max Clock Speed | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 20 MHz | 4 MHz grade |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB Flash | 3.5 KB Flash |
| RAM | 80 bytes | 80 bytes | 80 bytes | 80 bytes | 80 bytes | 224 bytes | 224 bytes |
| Supply Voltage | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.5 V to 6.25 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| Memory Type | OTP | OTP | OTP | OTP | OTP | Flash | Flash |
| Temperature Grade | Commercial | Commercial | Industrial (-40C to +85C) | Commercial | Industrial (-40C to +85C) | Industrial (-40C to +85C) | Commercial |
Bảo phân biệt quan trọng
- Same-die 'A' silicon revision with internal oscillator calibration (vsPIC16LC621A-04/SO)
- Industrial temperature grade option in the same 18-SOIC footprint (vsPIC16LC621AT-04I/SO)
- Direct flash-based migration path in same footprint (vsPIC16F627-I/SO)
- Lowest unit cost for fixed-code production (vsPIC16F627-I/SO / PIC16F628-04/SO)
Ghi chú thiết kế
Place a 0.1 uF ceramic decoupling capacitor as close as possible to the VDD pin (pin 14) of the PIC16LC621T-04/SO, with a 10 uF bulk capacitor on the supply rail. Although the device draws only a few mA at 4 MHz, OTP programming pulses on MCLR/VPP inject high di/dt transients that can corrupt logic operation if VDD is not well bypassed. For battery-powered designs leverage the SLEEP mode and verify the wake-up timing against the 4 MHz oscillator start-up specification in the Microchip datasheet.
Keep the trace between the crystal (or ceramic resonator) and the OSC1/OSC2 pins (15, 16) under 10 mm and surround them with a ground pour to minimise oscillator pickup of switching noise. The MCLR/VPP pin (pin 4) needs its own 10 kohm pull-up to VDD and a 100 nF cap to ground for in-circuit serial programming (ICSP). Reserve an unpopulated 6-pin ICSP header on prototype boards so OTP locking can be deferred until final firmware sign-off.
Remember that OTP memory on the PIC16LC621T-04/SO can only be programmed once - any code change after lockdown requires a new physical part. Always validate firmware on a flash-based PIC16F627-I/SO development board before committing to OTP programming. Also note that the maximum clock rate (4 MHz) is derated at lower VDD; consult the Fmax-versus-VDD graph in the datasheet to avoid oscillator failure at 3.0 V operation.
Thông tin tuân thủ
Standard PIC16LC621T-04/SO is commercial temperature grade; for AEC-Q100 qualified automotive designs migrate to the PIC16LC621AT-04I/SO variant. RoHS / lead-free / halogen-free status was not provided in the verified web data and is flagged [DATA_NEEDED] in the specs array.
