PIC16LC621A-04/SO - 8-Bit 4MHz OTP MCU, 1.75KB | Microchip
MPN: PIC16LC621A-04/SO ✓ Hoạt độngPIC16LC621A-04/SO Tóm tắt
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU, program memory, data RAM, and peripherals onto one die. The PIC16C family uses a Harvard RISC architecture that separates program and data buses for single-cycle instruction fetch and deterministic timing, enabling high code density at low clock rates. The PIC16LC621A-04/SO occupies the low-power CMOS "LC" tier within that family, optimized for applications that need OTP-based firmware with low static drain.
Key features include 13 bidirectional I/O pins, two 8-bit timers (Timer0 and Timer2-style modules), a Watchdog Timer with its own on-chip RC oscillator, and an analog comparator. A two-level deep hardware stack supports subroutine nesting, and the device supports direct, indirect, and relative addressing. Dual comparator inputs with programmable reference output make this part a frequent choice for simple sensor interfaces and battery-management front-ends.
Typical applications include low-cost consumer appliances, automotive body and interior modules (with -I/-E temperature grades available across the family), HVAC sensor interfaces, white-goods control boards, and the analog front-end of a switching power supply. The 18-SOIC footprint also supports through-hole legacy boards adapted to surface-mount assembly. For applications needing the same memory map but with field-reprogrammable Flash, designers typically migrate to the PIC16F627 family, which shares the same pinout.
When designing with this device, ensure Vdd decoupling uses a 100 nF ceramic capacitor placed within 5 mm of the package pins, and tie the MCLR pin high through the recommended 10 kohm pull-up to avoid spurious resets. The OTP memory means firmware revisions require a new part - plan for the Flash migration path (PIC16F627A-I/SO) on prototype spins.
This page consolidates distributor pricing, drop-in alternatives, and engineering design notes not found in a single manufacturer datasheet, and is intended to accelerate sourcing and BOM validation.
Bộ thay thế dễ dàng lắp đặt cho PIC16LC621A-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 PIC16LC621A-04/SO (cùng hình factor và footprint) — khác nhau ở Program Memory Size, Package, Core Architecture, Program Memory Type, Operating Temperature Range.
PIC16LC621A-04I/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LC621A-04E/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC621A-04C/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LC620A-04/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16LC620A-04E/SO
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F627T-04/SO
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16LC621-04/SO
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →PIC16LC621A-04/SO Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16C, 8-bit RISC (Harvard) |
| Instruction Word Size | 14-bit (12-bit opcode class) |
| Data Path Width | 8-bit |
| Tần số xung maksimum | 4 MHz |
| Program Memory Type | OTP EPROM |
| Program Memory Size | 1.75 KB (1K x 14) |
| Data RAM | 96 bytes |
| Supply Voltage (VDD) | 2.5 V to 6.25 V |
| I/O Pins | 13 |
| Timers | Two 8-bit (Timer0 + Timer2-style) |
| Analog Comparator | Yes (dual input, programmable reference) |
| Watchdog Timer | Yes (with dedicated on-chip RC) |
| Stack Depth | 2 hardware levels |
| Addressing Modes | Direct, Indirect, Relative |
| Hộp | 18-pin SOIC (SO-18, 0.300 inch) |
| Kiểu lắp đặt | Surface Mount |
| Cấp MSL | 1 |
| Trạng thái RoHS | Compliant |
Cấu hình chân PIC16LC621A-04/SO
| Chân 1 | RA2 — Bidirectional I/O / comparator reference output |
| Chân 2 | RA3 — Bidirectional I/O / analog comparator input |
| Chân 3 | RA4/T0CKI — Bidirectional I/O / Timer0 clock input |
| Chân 4 | MCLR — Master Clear reset input (active low) |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RB0/INT — Bidirectional I/O / external interrupt |
| Chân 7 | RB1 — Bidirectional I/O |
| Chân 8 | RB2 — Bidirectional I/O |
| Chân 9 | RB3 — Bidirectional I/O |
| Chân 10 | RB4 — Bidirectional I/O |
| Chân 11 | RB5 — Bidirectional I/O |
| Chân 12 | RB6 — Bidirectional I/O / serial programming clock |
| Chân 13 | RB7 — Bidirectional I/O / serial programming data |
| Chân 14 | VDD — Positive supply (2.5 V to 6.25 V) |
| Chân 15 | OSC2/CLKOUT — Oscillator output / clock out |
| Chân 16 | OSC1/CLKIN — Oscillator input / external clock in |
| Chân 17 | RA0 — Bidirectional I/O / analog comparator input |
| Chân 18 | RA1 — Bidirectional I/O / analog comparator input |
Ứng dụng tiêu biểu
PIC16LC621A-04/SO phù hợp cho 6 Áp dụngs: Low-Cost Consumer Appliance Control, Automotive Interior and Body Electronics, HVAC Sensor Interface Front-End, Switching Power Supply Analog Front-End, White Goods Control Boards (Washer / Dishwasher / Refrigerator), Battery-Powered Sensor and Smart-Home Nodes.
Low-Cost Consumer Appliance Control
The PIC16LC621A-04/SO is a strong fit for low-cost consumer appliances such as coffee makers, small kitchen gadgets, and countertop devices where BOM cost is paramount. Its 1.75 KB OTP EPROM and 96 B RAM are sufficient for simple state-machine firmware (button debounce, relay sequencing, LED indicators), while the 2.5 V to 6.25 V VDD range lets the same PCB accept either a 3.3 V or 5 V supply rail. The dual analog comparator with programmable voltage reference is useful for over-temperature sensing with an NTC thermistor, eliminating the need for an external comparator IC. At typical 4 MHz operation, instruction throughput is 1 MIPS, which is more than adequate for time-deterministic appliance sequencing. Its commercial 0 C to +70 C operating range matches most indoor appliance environments. Design tip: budget for an external 4 MHz ceramic resonator or crystal because internal oscillator accuracy on the PIC16C family is loose.
Được đề xuất
Automotive Interior and Body Electronics
The PIC16LC621A-04/SO is well suited to interior automotive body modules such as dome-light controllers, seat heaters, mirror adjusters, and keyless-entry receivers when the industrial -I temperature grade (PIC16LC621A-04I/SO) is selected. Its 13 I/O pins handle multiplexed keypad scanning, LED PWM dimming via Timer2, and relay or MOSFET driver outputs without external logic. The on-chip dual comparator simplifies battery-voltage monitoring and brownout detection, important for cranking transients in 12 V automotive rails. At 4 MHz, the 1 MIPS instruction throughput is deterministic, critical for LIN or simple UART-based body-network protocols. The SOIC-18 footprint is also friendly to automotive PCB assembly lines that prefer gull-wing leads over QFN. Design tip: pair with an external TVS diode on the VDD rail because automotive load-dump pulses can exceed 40 V.
Được đề xuất
HVAC Sensor Interface Front-End
The PIC16LC621A-04/SO serves well as the analog front-end controller in HVAC sensor-interface boards where NTC temperature sensors, humidity cells, and CO2 detectors all feed analog signals into the system. Its dual analog comparator with programmable on-chip voltage reference lets the firmware implement window-discriminator threshold logic for each sensor, offloading comparator hardware from the main MCU. The 96 B RAM and 1.75 KB OTP are sufficient for sensor linearization tables and modest state machines. The 2.5 V to 5.5 V range is convenient for 3.3 V fan-controller boards. The 18-SOIC package is easy to hand-prototype on through-hole-to-SMD adapter boards during HVAC controller validation. Design tip: drive each sensor with a dedicated RC low-pass filter to attenuate HVAC compressor noise before the comparator input.
Được đề xuất
Switching Power Supply Analog Front-End
The PIC16LC621A-04/SO is a useful auxiliary controller in the analog front-end of low-power AC-DC or DC-DC switchers, providing primary-side regulation feedback, housekeeping telemetry, or PWM housekeeping for digital-controlled converters. The on-chip dual analog comparator handles primary-side current sensing and over-voltage protection, while the programmable VREF can be repurposed as a soft-start reference. Its 2.5 V to 6.25 V VDD range is compatible with both 3.3 V and 5 V digital subsystems downstream. The 1 MIPS instruction throughput is enough for housekeeping loops that do not need the main switcher timing. For higher-frequency digital control, the PIC16F627A-I/SO Flash variant preserves the SOIC-18 footprint. Design tip: bypass VDD with a 100 nF X7R ceramic placed within 5 mm of the pins to suppress switching-noise injection into the comparator reference.
Được đề xuất
White Goods Control Boards (Washer / Dishwasher / Refrigerator)
The PIC16LC621A-04/SO is a strong match for white-goods control boards where a robust 8-bit MCU drives motor relays, valve solenoids, and indicator LEDs in washers, dishwashers, and refrigerators. The dual analog comparator supports water-level sensing via pressure transducers and NTC thermistor temperature monitoring for wash-cycle thermal protection. With 13 I/O pins, the MCU can directly drive up to 13 relays or sink LEDs without external logic, while Timer0 and Timer2 modules generate the timing-critical PWM and one-shot delays used in cycle sequencing. OTP memory provides tamper-resistance against firmware cloning - valuable for appliance makers protecting proprietary wash algorithms. The 18-SOIC surface-mount package is compatible with high-volume pick-and-place assembly lines. Design tip: add a software-based brownout counter to ride through motor-start voltage sags.
Được đề xuất
Battery-Powered Sensor and Smart-Home Nodes
The PIC16LC621A-04/SO is well-suited as a co-processor or housekeeping controller in battery-powered smart-home sensor nodes such as PIR motion detectors, door/window contact sensors, and HVAC-zone thermostatic radiator valves. Its CMOS LC process variant delivers low quiescent current, and the Watchdog Timer with its own on-chip RC oscillator allows the part to wake from sleep and service sensor interrupts without external components. The on-chip analog comparator handles battery-voltage telemetry and threshold-based wake events. The 2.5 V to 6.25 V VDD range is compatible with both 3.3 V coin-cell designs and 5 V USB-powered hubs. The 18-SOIC is also a serviceable retrofit for older through-hole PIR boards transitioning to SMD assembly. Design tip: use the Watchdog Timer to recover from RF-induced firmware stalls, which are common in dense wireless environments.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16LC621A-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-04I/SO | PIC16LC621A-04E/SO | PIC16LC621A-04C/SO | PIC16LC620A-04/SO | PIC16F627T-04/SO |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | SOIC-18 (0.300 inch) | SOIC-18 - same | SOIC-18 - same | SOIC-18 - same | SOIC-18 - same | SOIC-18 - same |
| Program Memory | 1.75 KB OTP EPROM | 1.75 KB OTP EPROM | 1.75 KB OTP EPROM | 1.75 KB OTP EPROM | 1.75 KB OTP EPROM | 1.75 KB Flash |
| Data RAM | 96 bytes | 96 bytes | 96 bytes | 96 bytes | 96 bytes | 128 bytes |
| Max Clock Frequency | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz | 4 MHz |
| Supply Voltage | 2.5 V to 6.25 V | 2.5 V to 6.0 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 |
| Operating Temperature | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) | -40 C to +125 C (extended) | 0 C to +70 C (commercial) | 0 C to +70 C (commercial) | -40 C to +85 C (industrial) |
| Analog Comparator | Yes (dual + VREF) | Yes (dual + VREF) | Yes (dual + VREF) | Yes (dual + VREF) | No | Yes (dual + VREF) |
| I/O Pins | 13 | 13 | 13 | 13 | 13 | 13 |
Bảo phân biệt quan trọng
- Only 8-bit PIC16C family member with full analog comparator + VREF at this cost point (vsPIC16LC620A-04/SO)
- Wide 2.5 V to 6.25 V VDD supports both 3.3 V and 5 V rails (vsPIC16F627T-04/SO)
- Industrial and extended temperature grades share the same SOIC-18 footprint (vsPIC16LC621A-04/SO (this part, commercial))
Ghi chú thiết kế
Decouple VDD with a 100 nF X7R ceramic placed within 5 mm of the SOIC-18 pins, and add a 10 uF bulk tantalum or aluminum-polymer cap on the same rail. The PIC16LC621A-04/SO is rated for 2.5 V to 6.25 V VDD; operation near the 6.25 V limit reduces comparator accuracy and increases current drain, so target 5.0 V for typical designs and add a 6.2 V Zener clamp for transient protection on noisy industrial rails.
The MCLR pin must be pulled high through the datasheet-recommended 10 kohm resistor; a direct short to VDD disables in-circuit serial programming (ICSP) and complicates factory firmware updates. Also remember that OTP EPROM cannot be erased - every firmware bug on the production part requires a new reel of PIC16LC621A-04/SO, so budget the Flash-based PIC16F627A-I/SO for prototype spins and qualify both parts.
Route the OSC1/OSC2 traces as a short, symmetric pair away from switching nodes and crossing the IC at a 90-degree angle to high-current traces. Place the 4 MHz ceramic resonator or crystal as close as possible to the OSC pins with its load capacitors tied to a quiet analog ground. For boards mixing analog comparators with digital outputs, route the comparator input traces on the opposite side of the PCB from any PWM or relay-coil drive traces.
The PIC16LC621A-04/SO analog comparator inputs share package pins with digital I/O; configure the CMCON register to disable digital output drivers on those pins to avoid digital feed-through into the comparator reference. Use the on-chip programmable voltage reference (VREF) rather than a noisy external divider to maintain a stable threshold across load and temperature variations.
Thông tin tuân thủ
Per the Microchip product page, the PIC16LC621A-04/SO is RoHS compliant and lead-free. It is not AEC-Q100 qualified; for AEC-Q100 automotive designs, migrate to a Flash equivalent from the PIC16F or PIC18 families.
