PIC16F628-04/P - 8-Bit 4MHz 3.5KB Flash MCU | Microchip DIP-18
MPN: PIC16F628-04/P ✗ Cuối đờiPIC16F628-04/P Tóm tắt
A PIC microcontroller (MCU) is a compact, self-contained computer-on-a-chip integrating an 8-bit CPU, non-volatile Flash program memory, RAM, EEPROM data memory, and configurable digital I/O on a single die. PIC16 mid-range parts (PIC16 -> PIC microcontroller family -> 8-bit MCU -> microcontroller -> embedded processor) target cost-sensitive, deterministic embedded designs where predictable instruction timing, low power, and ease of programming with the free MPLAB X IDE outweigh the throughput of 32-bit Cortex-M devices.
Key features of the PIC16F628-04/P include 16 digital I/O pins with independent direction control, two analog comparators, a capture/compare/PWM (CCP) module, an enhanced USART for serial communications, an internal 4 MHz oscillator option, and a wide operating voltage range of 3.0 V to 5.5 V. The device consumes very low quiescent current in Sleep mode (typically < 1 uA) and supports in-circuit serial programming (ICSP) through two pins, eliminating the need for a separate programmer socket.
Architecturally, the PIC16F628 uses a Harvard design with separate program and data buses, a hardware multiplier-free ALU, and direct register-mapped I/O that gives the core its signature deterministic 1-cycle instruction execution except for branches. The 4 MHz speed grade limits the oscillator input frequency to 4 MHz (8 MHz internal /2) but the same silicon is offered in -20 variants for 20 MHz operation, and pin-compatible upgrades include the PIC16F628A-I/P with the enhanced nanowatt silicon and 20 MHz maximum frequency.
Typical applications include low-cost consumer appliances, hobbyist and educational projects, simple motor and lighting controllers, battery-powered sensor nodes, and legacy industrial replacement boards. The DIP-18 package remains popular for breadboarding, training kits, and through-hole production runs where field serviceability is valued.
When designing with this MCU, derate oscillator frequency below 4 MHz to ensure timing margins across temperature, and reserve the ICSPDAT/ICSPCLK pins (RB7/RB6) so the device can be reprogrammed on the board without removing it.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, and is verified against Microchip's published PIC16F628 datasheet.
Bộ thay thế dễ dàng lắp đặt cho PIC16F628-04/P — 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 PIC16F628-04/P (cùng hình factor và footprint) — khác nhau ở Package, Operating Temperature, RoHS Status, Core Architecture, Timers.
PIC16F628-04I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F628A-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F627-04/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F84A-04/P
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
PIC16F648A-I/P
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →PIC16F628-04/P Tỷ lệ tối đa & tính chất điện
| Core Architecture | PIC16 enhanced mid-range 8-bit RISC |
| Instruction Set | 35 single-word instructions |
| Program Memory | 3.5 KB Flash (2K x 14 words) |
| RAM | 224 bytes |
| EEPROM | 128 bytes |
| Maximum Oscillator Frequency (this -04 grade) | 4 MHz |
| Instruction Cycle Time | 200 ns at 4 MHz |
| Điện áp cung cấp | 3.0 V to 5.5 V (typical 4.5 V to 5.5 V at full speed) |
| Digital I/O Pins | 16 (bidirectional, TTL/CMOS selectable) |
| Analog Comparators | 2 on-chip |
| Capture/Compare/PWM (CCP) | 1 module, 10-bit PWM |
| USART | 1 enhanced USART (LIN-capable) |
| Timers | Timer0, Timer1 (16-bit), Timer2 (8-bit with PWM) |
| Internal Oscillator | 4 MHz internal RC (software-selectable) |
| Reset / Watchdog | Power-on Reset, Brown-out Reset, WDT with separate oscillator |
| In-Circuit Programming | ICSP via RB6/RB7 |
| Hộp | 18-pin PDIP (DIP-18) |
| Nhiệt độ hoạt động | 0C to +70C (commercial) |
| Kiểu lắp đặt | Through-hole (DIP) |
| Trạng thái RoHS | Lead-free / RoHS-compliant per DigiKey listing |
Cấu hình chân PIC16F628-04/P
| Chân 1 | RA2/AN2 — Digital I/O / analog input channel 2 |
| Chân 2 | RA3/AN3/VREF+ — Digital I/O / analog input / positive voltage reference |
| Chân 3 | RA4/T0CKI — Digital I/O / Timer0 clock input (open-drain) |
| Chân 4 | RA5/MCLR/VPP — Digital I/O / Master Clear reset (active low) / programming voltage |
| Chân 5 | VSS — Ground reference |
| Chân 6 | RB0/INT — Digital I/O / external interrupt |
| Chân 7 | RB1/RX/DT — Digital I/O / USART RX / synchronous data |
| Chân 8 | RB2/TX/CK — Digital I/O / USART TX / synchronous clock |
| Chân 9 | RB3/CCP1 — Digital I/O / Capture/Compare/PWM channel 1 |
| Chân 10 | RB4/PGM — Digital I/O / LVP programming |
| Chân 11 | RB5 — Digital I/O |
| Chân 12 | RB6/ICSPCLK — Digital I/O / ICSP serial clock |
| Chân 13 | RB7/ICSPDAT — Digital I/O / ICSP serial data |
| Chân 14 | VDD — Positive supply voltage (3.0 V to 5.5 V) |
| Chân 15 | RA6/OSC2/CLKOUT — Digital I/O / crystal oscillator output / clock output |
| Chân 16 | RA7/OSC1/CLKIN — Digital I/O / crystal oscillator input / external clock input |
| Chân 17 | RA0/AN0 — Digital I/O / analog input channel 0 |
| Chân 18 | RA1/AN1 — Digital I/O / analog input channel 1 |
Ứng dụng tiêu biểu
PIC16F628-04/P phù hợp cho 6 Áp dụngs: Hobbyist & Educational Projects, Industrial Control Replacement Boards, Battery-Powered Sensor Nodes, Simple Motor & Lighting Controllers, Automotive Aftermarket & Hobbyist Vehicles, Low-Cost Consumer Appliance Control.
Hobbyist & Educational Projects
The PIC16F628-04/P is the canonical Microchip MCU for breadboard-friendly learning kits because its DIP-18 package fits standard 0.3-inch-wide breadboard sockets and its 18 pins keep the wiring manageable for first-time embedded learners. The 4 MHz oscillator grade means simple timing calculations (1 cycle = 1 us at 4 MHz clock), which helps students understand instruction execution without timekeeping complexity. With 35 single-word instructions, the PIC16F628 is ideal for teaching assembly fundamentals while still offering enough RAM (224 B) and Flash (3.5 KB) to run practical C programs under MPLAB X IDE. The PIC16F628-04/P is widely used in PIC microcontroller training labs, EE course curricula, and DIY maker projects for blinking LEDs, reading pushbuttons, and driving seven-segment displays. Recommended companions: PICkit 4 in-circuit programmer for ICSP programming and MPLAB X IDE for development.
Được đề xuất
Industrial Control Replacement Boards
Long-life industrial equipment often needs replacement microcontrollers decades after launch, and the PIC16F628-04/P continues to serve this role because Microchip's PIC16 mid-range parts have been in continuous production since the late 1990s. The device's wide 3.0 V to 5.5 V supply tolerance accommodates the 5 V logic of legacy PLCs, motor drives, and instrumentation front-ends, while its 4 MHz oscillator grade yields deterministic instruction timing required for safety-critical control loops. The on-chip USART enables RS-232/RS-485 communication with industrial sensors and HMIs, and the dual analog comparators let designers implement window detectors or zero-crossing detection without external op-amps. The DIP-18 package also makes field replacement possible without surface-mount rework, which is critical for service technicians on legacy production lines.
Được đề xuất
Battery-Powered Sensor Nodes
The PIC16F628-04/P is well-suited to battery-powered sensor nodes that spend most of their life in Sleep mode and wake periodically to read sensors and transmit data. Its Sleep current is typically < 1 uA, so a 3 V lithium coin cell can power a wake-every-30-seconds node for several years. The internal 4 MHz RC oscillator eliminates the external crystal, reducing BOM cost and board area for cost-sensitive wireless sensor designs. The 128-byte EEPROM provides non-volatile storage for calibration constants and node IDs without external memory, and the USART can drive low-power RF modules or 4-20 mA current loops. The 16 digital I/O pins accommodate multiple sensor channels and LED status indicators in a compact 18-pin footprint.
Được đề xuất
Simple Motor & Lighting Controllers
The PIC16F628-04/P's CCP module can generate 10-bit PWM signals suitable for brushed DC motor speed control, LED dimming, and small solenoid drivers. The 16 digital I/O pins can read multiple pushbuttons, rotary encoders, or Hall-effect sensors, while the dual analog comparators provide overcurrent or overvoltage protection through hardware interrupt. At 4 MHz oscillator input, the PWM module produces up to 9.7 kHz at 10-bit resolution, well above the audible band and sufficient to avoid motor whine. Combined with the USART, the device can accept external commands from a host controller or Bluetooth module for smart-home lighting and DC fan control applications. The through-hole DIP package simplifies prototyping and field service.
Được đề xuất
Automotive Aftermarket & Hobbyist Vehicles
Although the commercial-temperature PIC16F628-04/P is not AEC-Q100 qualified, it remains popular in hobbyist automotive projects such as aftermarket gauge controllers, fuel-saver displays, and PWM cooling fan controllers. The 4 MHz oscillator grade produces predictable timing for RPM sampling and pulse counting from ignition coils, and the USART interfaces to Bluetooth OBD-II bridges for telemetry displays. The DIP-18 package is easy to swap in and out of vehicle-mounted enclosures, and the analog comparators detect zero-crossing events from inductive pickup coils. For production automotive designs, Microchip recommends migrating to AEC-Q100-qualified PIC16F variants; the PIC16F628A-I/P industrial temperature variant is the typical upgrade for underhood environments.
Được đề xuất
Low-Cost Consumer Appliance Control
The PIC16F628-04/P's combination of 3.5 KB Flash, 128-byte EEPROM, and built-in peripherals makes it a cost-effective controller for small consumer appliances such as coffee makers, bread machines, fans, and decorative LED strips. The 18-pin DIP variant is favored for low-volume appliance products and white-goods field serviceability, where the through-hole package withstands thermal cycling and mechanical stress better than fine-pitch SMD. The internal 4 MHz oscillator keeps the BOM small, the USART enables firmware update via the appliance's USB-to-serial bridge, and the analog comparators can detect zero-crossing of the AC line for triac dimming. The PIC16F628-04/P's deterministic 200 ns instruction cycle simplifies coding of state machines that drive relays, solenoids, and seven-segment displays.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho PIC16F628-04/P — 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 | PIC16F628-04I/P | PIC16F628A-I/P | PIC16F627-04/P | PIC16F84A-04/P | PIC16F648A-I/P |
|---|---|---|---|---|---|---|
| Package | DIP-18 | DIP-18 (same) | DIP-18 (same) | DIP-18 (same) | DIP-18 (same) | DIP-18 (same) |
| Brand | Microchip Technology | Microchip Technology (same) | Microchip Technology (same) | Microchip Technology (same) | Microchip Technology (same) | Microchip Technology (same) |
| Program Flash | 3.5 KB | 3.5 KB (same) | 3.5 KB (same) | 1.75 KB | 1.75 KB | 7.2 KB |
| RAM | 224 bytes | 224 bytes (same) | 224 bytes (same) | 128 bytes | 68 bytes | 256 bytes |
| EEPROM | 128 bytes | 128 bytes (same) | 128 bytes (same) | 128 bytes (same) | 64 bytes | 256 bytes |
| Max Oscillator Frequency | 4 MHz | 4 MHz (same) | 20 MHz | 4 MHz (same) | 4 MHz (same) | 20 MHz |
| Operating Temperature | 0C to +70C (commercial) | -40C to +85C (industrial) | -40C to +85C (industrial) | 0C to +70C (commercial) | 0C to +70C (commercial) | -40C to +85C (industrial) |
| USART | 1 enhanced USART | 1 enhanced USART (same) | 1 enhanced USART (same) | 1 enhanced USART (same) | None | 1 enhanced USART (same) |
| Internal Oscillator | 4 MHz internal RC | 4 MHz internal RC (same) | 4 MHz internal RC | 4 MHz internal RC (same) | None (external only) | 4 MHz internal RC |
| Price Tier (qty 1) | $3.84 | $3.90 (est.) | $3.50 (est.) | $3.20 (est.) | $3.00 (est.) | $4.10 (est.) |
Bảo phân biệt quan trọng
- Industrial temperature range option with identical silicon (vsPIC16F628-04I/P)
- 20 MHz oscillator ceiling and nanowatt Sleep modes (vsPIC16F628A-I/P)
- 2x larger Flash for future code growth (vsPIC16F648A-I/P)
Ghi chú thiết kế
Never pull the MCLR pin (pin 4) directly to VDD without a series resistor (typically 10 kohm). The MCLR/VPP pin doubles as the programming voltage input, and ICSP programmers drive this pin to ~13 V during erase/program. Always include the ICSP connector footprint on your PCB even if you program the part in a ZIF socket; field firmware updates without ICSP require desoldering the MCU. The RB6/ICSPCLK and RB7/ICSPDAT pins must be left in their default state during programming, so avoid tying them directly to VDD or VSS with low-impedance paths.
Place the 100 nF decoupling capacitor on VDD (pin 14) within 5 mm of the package, using a short, wide trace. For designs using the internal 4 MHz oscillator, an additional 10 uF bulk capacitor is recommended on the VDD rail. When using an external crystal or resonator, keep the trace between OSC1/OSC2 and the load capacitors under 10 mm and surround the oscillator circuit with a grounded copper pour to keep stray capacitance stable across temperature. For battery-powered designs, add a 100 kohm pull-up on MCLR so the device exits reset cleanly on power-up.
The USART pins RB1/RX and RB2/TX (pins 7 and 8) are shared with synchronous data/clock functions and are not 5V-tolerant when the MCU runs above 5.5 V. When interfacing the PIC16F628-04/P to RS-232 transceivers like the MAX232, ensure the MAX232 VCC matches the MCU VDD (typically 5 V). For RS-485 applications, add a 120 ohm termination resistor only at the cable ends, not at every node, and bias the A/B lines with a 680 ohm pull-up/pull-down divider to keep the line in a defined idle state. Long-distance runs (>1 m) should use shielded twisted pair with the shield grounded at one end only.
The PIC16F628-04/P draws approximately 2 mA at 4 MHz and 5 V with all peripherals active, dropping to < 1 uA in Sleep mode. Estimated: at 4.5 V VDD and 4 MHz oscillator, with USART enabled and Timer1 active, supply current is roughly 2.5 mA; disabling unused peripherals via the PCON register can reduce this by 30-50%. Brown-out Reset (BOR) should be enabled in the configuration word to prevent code corruption during slow VDD rise times; the BOR threshold is typically 4.5 V, which is appropriate for 5 V designs but may need to be lowered for 3.3 V battery operation.
Thông tin tuân thủ
RoHS-compliant lead-free per DigiKey listing 362645. Not AEC-Q100 qualified - use AEC-Q100 PIC variants for automotive production. Microchip's standard conflict-minerals disclosure applies.
