PIC16C621T-20E/SO - 8-Bit 20MHz OTP MCU, 1.75KB | Microchip
MPN： PIC16C621T-20E/SO ✓ 啟用中PIC16C621T-20E/SO 概覽
Background Knowledge. A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory, RAM, and peripheral interfaces. The PIC16C family uses a RISC (Reduced Instruction Set Computer) Harvard architecture with separate program and data buses. OTP program memory allows the device to be programmed once at production; for re-programmable Flash variants in the same pinout, designers typically migrate to the PIC16F or PIC16C62x equivalents. The 16C family sits inside the broader taxonomy: microcontroller -> embedded controller -> integrated circuit -> semiconductor.
Key Features. Core/PIC16c621t-20e/so delivers 20 MHz maximum clock speed, 13 digital I/O pins, two 8-bit timers (TMR0 and TMR2 with prescaler), one analog comparator, a watchdog timer with on-chip RC oscillator, and an operating voltage range of 3.0 V to 6.0 V. The PIC16C621T-20E/SO operates over the extended temperature range of -40 C to +125 C. The wide-body 18-SOIC package is supplied on tape and reel (T/R) for surface-mount assembly.
Technical Depth. The device executes most instructions in a single 200 ns cycle at 20 MHz. Its 14-bit instruction word and 8-bit data path are characteristic of the baseline-plus PIC16C6xx sub-family. Brown-out reset and power-on reset are supported; in-circuit serial programming (ICSP) is available via RB6/RB7 for production programming despite the OTP memory architecture.
Typical Applications. The PIC16C621T-20E/SO suits industrial control, automotive body electronics, consumer appliances, security systems, and white-goods control boards requiring low-cost, fixed-function 8-bit control. Its -40 C to +125 C extended range allows deployment under-hood or in outdoor enclosures.
Design Consideration. The OTP memory cannot be erased; for prototyping or field updates choose the Flash-based PIC16F62x pin-compatible variant. A decoupling capacitor of 0.1 uF must be placed within 5 mm of VDD.
Unique Value. This page synthesizes distributor stock data, exact-spec drop-in alternates, and lifecycle context not aggregated on the manufacturer product page.
直接替換替代品，適用於 PIC16C621T-20E/SO — 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： PIC16C621T-20E/SO （相同外形與佔位） — 差異在於 Program Memory Size, Program Memory Type, Package, Operating Temperature Range, RAM Size.
PIC16C621AT-20E/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC16C621-20I/SO
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16C620-20E/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC16C620T-20E/SO
✅ 直接替換📋 參考替代品（不在目錄中）
PIC16C620AT-20E/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC16C620A-20E/SO
✅ 直接替換聯絡詢價
查看資料表 →PIC16C621T-20E/SO 最大額定值與電氣特性
| Manufacturer | Microchip Technology |
| Series | PIC 16C |
| Core Processor | PIC |
| Core Size | 8-Bit |
| Maximum Clock Speed | 20 MHz |
| Program Memory Size | 1.75 KB (1K x 14) OTP |
| RAM Size | 80 x 8 bytes (80 B) |
| Number of I/O Pins | 13 |
| Supply Voltage Range | 3.0 V to 6.0 V |
| 工作溫度範圍 | -40 C to +125 C (Extended) |
| 封裝 / 外殼 | 18-SOIC (0.295", 7.50 mm width) |
| 安裝類型 | Surface Mount |
| Packaging | Tape & Reel (T/R) |
| Oscillator Type | External |
| Peripherals | Brown-out Reset, Watchdog Timer, Comparator |
| Connectivity | ICSP (In-Circuit Serial Programming) |
| Program Memory Type | OTP (One-Time Programmable) |
| RoHS 狀態 | Non-Compliant (T suffix: tape & reel) |
PIC16C621T-20E/SO 腳位配置
| 腳位 1 | RA2 — Port A bit 2 / analog input |
| 腳位 2 | RA3 — Port A bit 3 / analog input |
| 腳位 3 | RA4 — Port A bit 4 / T0CKI (Timer0 clock input) |
| 腳位 4 | MCLR — Master Clear (Reset) input |
| 腳位 5 | VSS — Ground reference |
| 腳位 6 | RB0/INT — Port B bit 0 / external interrupt |
| 腳位 7 | RB1 — Port B bit 1 |
| 腳位 8 | RB2 — Port B bit 2 |
| 腳位 9 | RB3 — Port B bit 3 |
| 腳位 10 | RB4 — Port B bit 4 |
| 腳位 11 | RB5 — Port B bit 5 |
| 腳位 12 | RB6 — Port B bit 6 / ICSP clock |
| 腳位 13 | RB7 — Port B bit 7 / ICSP data |
| 腳位 14 | VDD — Positive supply voltage |
| 腳位 15 | OSC2/CLKOUT — Oscillator output / clock out |
| 腳位 16 | OSC1/CLKIN — Oscillator input / clock in |
| 腳位 17 | RA0 — Port A bit 0 / analog input |
| 腳位 18 | RA1 — Port A bit 1 / analog input |
典型應用
PIC16C621T-20E/SO 適用於 6 應用s: Industrial Automation Control, Automotive Body Electronics, Consumer Appliance Control, Security and Alarm Systems, Smart Home Sensor Nodes, Hobby and Education Development.
Industrial Automation Control
The PIC16C621T-20E/SO fits industrial automation controllers where its 20 MHz PIC core executes deterministic control loops with a 200 ns instruction cycle. With 13 digital I/O pins and 3.0 V to 6.0 V supply tolerance, the part interfaces directly to 5 V PLC backplanes and 3.3 V sensor bridges. The extended -40 C to +125 C temperature range allows deployment in factory-floor enclosures, motor-drive auxiliary boards, and conveyor controllers without thermal derating. The internal watchdog timer adds fail-safe recovery in a supervisor role, providing protection for unattended industrial nodes.
推薦
Automotive Body Electronics
The PIC16C621T-20E/SO serves automotive body controllers including seat controllers, mirror adjusters, and lighting modules. Its -40 C to +125 C extended range covers under-hood and cabin environments. The 13 I/O pins handle switch scanning, relay drivers, and LIN-bus wake-up tasks. OTP memory secures the application code against unauthorized field reprogramming - a deliberate design choice for high-volume automotive ECUs where software stability outweighs field updates. Brown-out reset and watchdog ensure recovery from cranking-voltage dips during engine start.
推薦
Consumer Appliance Control
The PIC16C621T-20E/SO targets white-goods controllers in washing machines, dishwashers, and microwave ovens. Its 1.75 KB OTP holds appliance cycle logic, sensor sampling, and user-interface state machines. The PIC16C62x instruction set simplifies C/assembly development for engineers familiar with baseline PIC cores. The 18-SOIC wide-body package supports through-hole-style hand-soldering repairs, lowering field-service cost in consumer markets. Low cost at 1.72 USD per 1k qty enables deployment in sub-30 USD retail appliances.
推薦
Security and Alarm Systems
The PIC16C621T-20E/SO controls PIR motion detectors, door/window sensors, and siren drivers in security alarm panels. Its low power consumption and 13 I/O pins handle multiple zone inputs plus keypad scanning. OTP memory locks the alarm protocol against cloning attacks, while the analog comparator enables direct PIR sensor interfacing without external op-amps. The extended temperature range allows outdoor mounting in cold-climate security devices. Watchdog timer prevents lockup during brown-out events in battery-backed alarm panels.
推薦
Smart Home Sensor Nodes
The PIC16C621T-20E/SO is a fit for low-cost smart-home sensor endpoints - thermostats, leak detectors, and HVAC zone controllers. Its 8-bit PIC core delivers predictable latency for control loops with minimum external BOM (no external EEPROM needed for fixed-function nodes). The 3.0 V to 6.0 V supply range accommodates both 3.3 V coin-cell and 5 V USB-powered nodes. Brown-out reset guarantees clean restart after battery brownout; ICSP allows factory programming and final test. Pin-compatible Flash variants ease firmware iteration during development.
推薦
Hobby and Education Development
The PIC16C621T-20E/SO remains a teaching platform for embedded-systems courses thanks to its PIC baseline instruction set and abundant educational resources. With 1.75 KB OTP, students implement timers, PWM via Timer2, and analog comparator projects on the same die used in commercial products. The 18-SOIC is breadboard-friendly via SOIC-to-DIP adapters. ICSP allows students to program multiple iterations on the same board; once finalized, OTP locks the code for the final demonstration unit. Microchip MPLAB X IDE and XC8 compiler handle the legacy code.
推薦
推薦產品摘要
工程參考資料，適用於 PIC16C621T-20E/SO — 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 | PIC16C621AT-20E/SO | PIC16C621-20I/SO | PIC16C620-20E/SO |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 18-SOIC (wide-body) | 18-SOIC - same | 18-SOIC - same | 18-SOIC - same |
| Core Size | 8-Bit | 8-Bit | 8-Bit | 8-Bit |
| Max Clock Speed | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Program Memory | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP | 1.75 KB OTP |
| RAM Size | 80 B | 80 B | 80 B | 80 B |
| Operating Voltage | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V | 3.0 V to 6.0 V |
| Operating Temperature | -40 C to +125 C (Extended) | -40 C to +125 C (Extended) | 0 C to +70 C (Industrial) | -40 C to +125 C (Extended) |
| Number of I/O | 13 | 13 | 13 | 13 |
主要差異化特點
- Extended -40 C to +125 C operating temperature range (對比PIC16C621-20I/SO)
- Lower per-unit cost in 1k+ volume (對比PIC16C620-20E/SO)
- Tape & reel packaging for high-volume SMD assembly (對比PIC16C621-20/P (PDIP tube))
設計說明
Estimated: at VDD = 5.0 V and 20 MHz active mode, typical IDD is approximately 5 mA; total power is roughly 25 mW. Add a 0.1 uF decoupling capacitor within 5 mm of VDD (pin 14) to suppress core-logic switching transients. A bulk 10 uF tantalum capacitor on the supply rail handles motor inrush and brown-out events. For battery-backed designs, switch the PIC16C621T-20E/SO to SLEEP mode (~1 uA) when idle; wake via the watchdog timer or external interrupt on RB0/INT.
Estimated: at 20 MHz, 5 V, 8 mA active load, the 18-SOIC dissipates roughly 40 mW - well within the 18-SOIC thermal envelope of approximately 800 mW. The -40 C to +125 C extended operating range is verified by Microchip characterization. For designs at the temperature extreme, derate clock frequency to 4 MHz and confirm oscillator start-up margins in cold-box qualification.
Estimated: route MCLR (pin 4) directly to the reset controller with a 10 kohm pull-up to VDD; do not place bypass capacitors on MCLR. Place the 18-SOIC crystal/oscillator within 5 mm of OSC1/OSC2 to minimize stray capacitance. Keep RB6/RB7 (ICSP clock/data) traces short to prevent programming interference from adjacent signal edges; avoid routing high-frequency signals across these traces. Maintain a ground plane under the part to reduce EMI from the oscillator.
Estimated: the PIC16C621T-20E/SO uses OTP program memory that cannot be electrically erased - prototype firmware development requires Flash-based PIC16F62x variants (e.g. PIC16F628A-I/SO) before committing to OTP production. Pin assignments for RA0-RA4 and RB0-RB7 differ in alternate-function modes; consult the PIC16C62x datasheet before final pin assignment to avoid conflicts with Timer0 clock input (RA4/T0CKI) and ICSP (RB6/RB7).
合規資訊
T-suffix packaging. OTP program memory architecture. Not automotive-qualified; refer to Microchip PIC16F automotive-grade parts for AEC-Q100 designs. Reach status per Microchip product declaration.