PIC16F627-20/SS - 8-bit Flash MCU 20MHz 1.75KB SSOP-20 | Microchip
MPN： PIC16F627-20/SS ✓ 啟用中PIC16F627-20/SS 概覽
A microcontroller (MCU) is a single-chip computer containing a CPU, non-volatile program memory (Flash), volatile data memory (RAM), and a configurable set of peripheral interfaces. The PIC16F627 sits within the broader hierarchy of 8-bit MCU -> microcontroller -> embedded controller -> semiconductor IC. Microchip's PIC16F family is among the longest-lived mid-range 8-bit architectures and is widely taught in universities and used in commercial products where deterministic timing, low cost, and ease of development outweigh the need for high-performance ARM-class processing.
Key features of the PIC16F627-20/SS include a Power-on Reset (POR), a Power-up Timer (PWRT), an Oscillator Start-up Timer (OST), a Brown-out Detect (BOD) block, and a Watchdog Timer (WDT) with its own dedicated on-chip RC oscillator for reliable operation. Additional peripherals include a multiplexed MCLR pin, programmable weak pull-ups on PORTB, a USART for serial communication, two 8-bit timers and one 16-bit timer, an analog comparator, and an internal voltage reference. The device is supported by the MPLAB X IDE, the XC8 C compiler, and the legacy PICkit programmers, easing development.
Architecturally the device is built on Harvard architecture with separate program and data buses, allowing instruction fetch and data access to occur in the same instruction cycle. This delivers deterministic throughput - most instructions execute in a single 200 ns cycle at 20 MHz - which is one reason the PIC family is favoured for time-sensitive control loops.
Typical applications include appliance control boards, sensor interface modules, low-end consumer electronics, lighting controllers, and hobby/educational kits. The wide third-party ecosystem and stable toolchain reduce time-to-market for designers replacing older PIC16F84A or PIC16F627 designs. When selecting the -20/SS variant, ensure the 4.5 V to 5.5 V supply matches the speed grade - the older /04 and /20 grades differ only in oscillator rating and Vdd range. This page synthesises distributor pricing, drop-in SSOP-20 alternatives, and design considerations that the bare manufacturer datasheet does not present.
直接替換替代品，適用於 PIC16F627-20/SS — 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： PIC16F627-20/SS （相同外形與佔位） — 差異在於 Package, Timers, I/O Pins, Analog Comparators, Internal Oscillator.
PIC16F627A-I/SS
✅ 直接替換聯絡詢價
查看資料表 →PIC16F627-04/SS
✅ 直接替換聯絡詢價
查看資料表 →PIC16F628-20/SS
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16F627-20I/SS
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
PIC16F628A-I/SS
✅ 直接替換聯絡詢價
查看資料表 →PIC16LF627A-I/SS
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16F627-20/SS 最大額定值與電氣特性
| Core Architecture | 8-bit PIC16 Harvard RISC |
| Family | PIC16F62X |
| Program Memory (Flash) | 1.75 KB (1792 bytes) |
| Data Memory (RAM) | 224 bytes |
| Data EEPROM | 128 bytes |
| 最大時脈頻率 | 20 MHz |
| Instruction Set | 35 single-cycle instructions |
| Supply Voltage (Vdd) | 4.5 V to 5.5 V (20 MHz grade) |
| I/O Pins | 16 bidirectional |
| Timers | 2 x 8-bit, 1 x 16-bit |
| Analog Comparators | 2 |
| USART | Yes (1) |
| Watchdog Timer | Yes, dedicated on-chip RC oscillator |
| Brown-out Detect | Yes |
| Power-on Reset / PWRT / OST | Yes |
| 封裝 | 20-pin SSOP (5.30 mm body) |
| 安裝類型 | Surface Mount |
| RoHS 狀態 | Compliant (lead-free) |
PIC16F627-20/SS 腳位配置
| 腳位 1 | RA2/AN2/CVREF — Bidirectional I/O / analog channel 2 / comparator voltage reference output |
| 腳位 2 | RA3/AN3/C1OUT — Bidirectional I/O / analog channel 3 / comparator 1 output |
| 腳位 3 | RA4/T0CKI/C2OUT — Bidirectional I/O / Timer0 clock input / comparator 2 output |
| 腳位 4 | RA5/MCLR/VPP — Bidirectional I/O / master clear (reset) input / programming voltage |
| 腳位 5 | VSS — Ground reference |
| 腳位 6 | RB0/INT — Bidirectional I/O / external interrupt |
| 腳位 7 | RB1/RX/DT — Bidirectional I/O / USART RX / synchronous data |
| 腳位 8 | RB2/TX/CK — Bidirectional I/O / USART TX / synchronous clock |
| 腳位 9 | RB3/CCP1 — Bidirectional I/O / capture/compare/PWM 1 |
| 腳位 10 | RB4/PGM — Bidirectional I/O / low-voltage ICSP programming |
| 腳位 11 | RB5/PCSCK — Bidirectional I/O / ICSP serial clock |
| 腳位 12 | RB6/PCSDAT — Bidirectional I/O / ICSP serial data |
| 腳位 13 | RB7 — Bidirectional I/O |
| 腳位 14 | VDD — Positive supply voltage |
| 腳位 15 | OSC2/CLKOUT — Oscillator output / clock output (crystal mode) |
| 腳位 16 | OSC1/CLKIN — Oscillator input / external clock input |
| 腳位 17 | RA0/AN0 — Bidirectional I/O / analog channel 0 |
| 腳位 18 | RA1/AN1 — Bidirectional I/O / analog channel 1 |
| 腳位 19 | RA6/OSC2 — Bidirectional I/O / alternate oscillator output |
| 腳位 20 | RA7/OSC1 — Bidirectional I/O / alternate oscillator input |
典型應用
PIC16F627-20/SS 適用於 6 應用s: Appliance Control Boards, Sensor Interface Modules, Low-End Consumer Electronics, Lighting Controllers, Educational and Hobby Kits, Automotive Body Electronics (Non-Safety).
Appliance Control Boards
The PIC16F627-20/SS fits washing-machine, dishwasher and microwave control panels because its 16 I/O pins, two analog comparators and USART drive relays, keypads and triac interfaces at 5 V. At 20 MHz the Harvard RISC core executes a 35-instruction cycle in 200 ns, so control loops run deterministically and meet safety timing budgets. The 1.75 KB Flash accommodates state-machine firmware with room for protocol stacks, and the 224 byte RAM keeps scan tables resident without external memory. Brown-out detect and watchdog timer with dedicated RC oscillator guard against supply droop and firmware runaway. Industrial temperature grades and the SSOP-20 surface-mount footprint suit compact appliance PCAs.
推薦
Sensor Interface Modules
The PIC16F627-20/SS interfaces analog and digital sensors in HVAC, security and industrial telemetry nodes. Two on-chip analog comparators and a programmable voltage reference let the MCU directly condition thermistor, photocell and 4-20 mA loop signals without external op-amps. The USART connects to RS-485 transceivers or low-power RF modules, while the 16-bit timer captures pulse-output flow meters. Brown-out detect protects against brownouts in long cable runs. Programmable weak pull-ups on PORTB eliminate external resistors for switch and one-wire sensors. The SSOP-20 footprint fits inside small sensor housings.
推薦
Low-End Consumer Electronics
The PIC16F627-20/SS powers remote controls, toys, educational kits and small home appliances where 8-bit performance and ultra-low BOM cost outweigh raw MIPS. Its 1.75 KB Flash holds user-interface state machines and IR protocols, while the SSOP-20 package keeps the PCB under 10 mm square. The Harvard RISC pipeline executes each instruction in one cycle so a 50 mA LED PWM dimmer or a buzzer tone generator responds without jitter. Brown-out detect and the watchdog timer with its own on-chip RC oscillator protect battery-low conditions. Microchip's free MPLAB X IDE and XC8 compiler accelerate firmware iteration.
推薦
Lighting Controllers
The PIC16F627-20/SS drives LED dimmers and DMX-512 slave nodes because its 16-bit timer produces 16-bit PWM resolution at 5 V for flicker-free dimming curves. The USART receives DMX packets at 250 kbaud, while the analog comparators monitor zero-cross for triac phase-control of incandescent and dimmable LED loads. Programmable weak pull-ups on PORTB interface directly to tactile switches, and the brown-out detect prevents spurious dim levels during mains brownouts. The 20 MHz clock leaves enough headroom for the UART, PWM and protocol stack simultaneously. SSOP-20 fits slim in-fixture PCBs.
推薦
Educational and Hobby Kits
Universities and makers favour the PIC16F627-20/SS for embedded-systems courses because the PIC16F62X architecture is documented in textbooks, the free MPLAB X IDE and XC8 compiler support Windows/macOS/Linux, and the PICkit programmers target the SSOP-20 footprint directly. Students can blink an LED, drive a 7-segment display, or implement a UART bootloader using the on-chip USART, two analog comparators and 16 I/O lines - all without external peripherals. The 1.75 KB Flash accommodates introductory C projects, and the 128-byte EEPROM stores non-volatile parameters. The 20 MHz instruction throughput keeps labs responsive during debugging.
推薦
Automotive Body Electronics (Non-Safety)
The PIC16F627-20/SS controls low-speed body electronics such as door-lock modules, mirror adjusters and interior lighting timers where 8-bit performance, 5 V operation and the SSOP-20 footprint suffice. Its brown-out detect and watchdog timer guard against automotive cranking transients and supply dropouts. Two analog comparators interface directly with Hall-effect sensors and current shunts. The 1.75 KB Flash fits protocol stacks for LIN-bus slaves via the USART plus a software bit-bang layer. Note: for safety-critical automotive systems, designers should evaluate the PIC16F627-20I/SS industrial-grade variant or migrate to AEC-Q100-qualified PIC16F1xxx parts.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16F627-20/SS — 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 | PIC16F627A-I/SS | PIC16F627-04/SS | PIC16F628-20/SS | PIC16F627-20I/SS | PIC16F628A-I/SS | PIC16LF627A-I/SS |
|---|---|---|---|---|---|---|---|
| Package | 20-SSOP (5.30 mm) | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same | 20-SSOP - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 1.75 KB | 1.75 KB | 1.75 KB | 2 KB | 1.75 KB | 2 KB | 1.75 KB |
| RAM | 224 bytes | 224 bytes | 224 bytes | 224 bytes | 224 bytes | 224 bytes | 224 bytes |
| EEPROM | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes | 128 bytes |
| Maximum Clock | 20 MHz | 20 MHz | 4 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Supply Voltage | 4.5 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V | 3.0 V to 5.5 V | 4.5 V to 5.5 V | 2.0 V to 5.5 V | 2.0 V to 5.5 V |
| I/O Pins | 16 | 16 | 16 | 16 | 16 | 16 | 16 |
| Internal Oscillator | No | No | No | Yes (4 MHz) | No | Yes (4-8 MHz) | No |
主要差異化特點
- Highest clock speed in the /20 grade at 4.5-5.5 V supply (對比PIC16F627-04/SS)
- Original silicon revision with widest third-party ecosystem (對比PIC16F627A-I/SS)
- Lower cost than upgraded 628 variants (對比PIC16F628-20/SS)
設計說明
The PIC16F627-20/SS requires a clean 5 V rail: place a 100 nF ceramic bypass capacitor within 5 mm of the VDD pin and a 10 uF tantalum or ceramic bulk capacitor near the supply entry point. The brown-out detect (BOD) block must be configured in configuration bits to match the minimum Vdd of 4.5 V; enabling BOD prevents code corruption during mains dips. The MCLR pin should be tied to VDD through a 10 kohm pull-up resistor, with a 100 nF capacitor to ground for noise immunity, unless external reset is required.
Route the crystal traces (OSC1/OSC2) as short as possible and guard them with a ground pour to minimise capacitive coupling from switching signals. Keep the crystal within 5 mm of the MCU and avoid routing digital signals underneath. If using the internal RC oscillator mode (not available on -20/SS but on -628), still keep OSC1/OSC2 traces short to avoid stray pickup. Place the ICSP clock/data lines (RB6/RB7) on outer PCB layers accessible to the PICkit probe.
Do not assume the PIC16F627-20/SS supports 3.3 V operation - the /20 speed grade requires 4.5 V to 5.5 V. For 3.3 V systems, choose the PIC16F627-04/SS (4 MHz) or PIC16F627A-I/SS (20 MHz, 2.0-5.5 V). The watchdog timer must be enabled in configuration bits AND periodically cleared (CLRWDT) in firmware, or it will reset the MCU unexpectedly. Also: do not leave OSC1 floating when using an external crystal - tie the crystal across OSC1/OSC2 with the datasheet-recommended load capacitors.
The PIC16F627-20/SS USART pins (RB1/RX, RB2/TX) are 5 V TTL-level and tolerant of 3.3 V inputs but not of higher voltages. Add a 100 ohm series resistor on RB2/TX when driving long cables to limit ringing. For RS-485 half-duplex networks, drive the MCP2551 or MAX485 transceiver from the USART and use a software-direction bit on another I/O pin for DE/RE control. Enable programmable weak pull-ups on PORTB for switch inputs to eliminate external resistor networks.
合規資訊
Lead-free and RoHS compliant per Heisener listing and Microchip product page; AEC-Q100 not qualified (industrial temperature grade only).
