R5F21154SP#U0 - 16-Bit 20MHz Flash MCU | Renesas Electronics
部品番号: R5F21154SP#U0 ✓ 生産中R5F21154SP#U0 概要
A microcontroller is a semiconductor device that integrates a CPU core, memory, and peripheral functions into one package. The R8C/15 belongs to the R8C family of 16-bit embedded controllers, combining an embedded CPU, flash program memory, and general-purpose I/O in a compact surface-mount device. This hierarchy places the part within embedded processing while keeping the external component count and board area below that of a discrete processor design.
Key verified features include a maximum operating frequency of 20 MHz, 16 KB organized as 16K x 8 flash, 16-bit CPU architecture, 1 MB memory space, 3 V to 5 V operation, and a 20-pin LSSOP package. The high-performance silicon gate CMOS process supports an efficient implementation, while single-power-source flash programming simplifies production programming and field firmware updates. The package is identified by distributor sources as 20-LSSOP, also described elsewhere as a 20-pin plastic molded LSSOP.
Typical uses include compact industrial controllers, appliance-control boards, sensor-conditioning equipment, communication modules, and small consumer products. The 20 MHz R8C core provides useful processing headroom for protocol handling, state-machine control, and supervisory logic, while the integrated 16 KB flash eliminates a separate program-memory component in suitable designs.
When designing around this MCU, verify the complete pin assignments, peripheral mix, and electrical limits in the Renesas datasheet before finalizing the PCB. Pay particular attention to supply decoupling, programming interface requirements, clock configuration, and unused-pin handling. Existing firmware should also be checked for clock, timer, and memory-map assumptions before replacing another MCU.
This page consolidates verified distributor specifications, manufacturer product information, package details, sourcing links, and replacement guidance. It distinguishes the electrically and mechanically verified R5F21154SP family option from unverified substitutes so engineers can make a conservative, footprint-aware decision.
ドロップイン代替品: R5F21154SP#U0 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
R5F21154SP#W4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
R5F21154SP#UO
✅ ドロップイン📋 参考代替品（カタログ未掲載）
R5F21154SP#U0 最大定格＆電気的特性
| Product Type | 16-bit microcontroller |
| Series | R8C/1x/15 |
| CPU Core | R8C/Tiny Series |
| Maximum Operating Frequency | 20 MHz |
| Internal Flash Memory | 16 KB (16K x 8) |
| Memory Space | 1 MB |
| 電源電圧 | 3 V to 5 V |
| Process Technology | High-performance silicon gate CMOS |
| Flash Programming Supply | Single power source |
| パッケージ | 20-pin LSSOP |
| Package Construction | 20-pin plastic molded LSSOP |
| Lead-Free Status | Pb-Free |
| 実装タイプ | Surface Mount |
| ピン数 | 20 pins |
| Program Memory Type | Flash |
| Product Family | R8C 16-bit microcontrollers |
R5F21154SP#U0 20-pin plastic molded lssop ピン配置ガイド
R5F21154SP#U0 (20-pin plastic molded lssop パッケージ) のピン配置。 このデジタルICには、GPIO、通信インターフェース (UART、SPI、I2C)、および電源ピンが含まれています。代替ピン機能と設定オプションについては、メーカーのデータシートを参照してください。組み込みシステム設計とPCBレイアウトに不可欠です。
詳細なピン配置データはありません: R5F21154SP#U0.
詳細は データシート をご参照ください。
主な用途
R5F21154SP#U0 の用途: 6 件s: Compact Industrial Control Boards, Appliance and White-Goods Controllers, Sensor Conditioning and Monitoring, Communication Interface Modules, Battery-Powered Portable Accessories, Programmable Logic and Sequencer Products.
Compact Industrial Control Boards
The R5F21154SP#U0 fits compact industrial control boards that require a 16-bit CPU, up to 20 MHz operating speed, and integrated program storage. Its 16 KB flash can hold a compact control program without a separate external program-memory IC, while the 3 V to 5 V operating range supports common industrial logic rails. The device can coordinate discrete sensors, outputs, timers, and supervisory functions in a 20-pin LSSOP footprint. Designers should verify the exact I/O count, peripheral availability, electrical limits, and temperature requirements before using it in a new controller.
おすすめ
Appliance and White-Goods Controllers
R5F21154SP#U0 is appropriate for appliance controllers where deterministic embedded sequencing, local flash storage, and a compact package are valuable. A 20 MHz R8C core can execute control states, user-interface logic, sensor checks, and motor or relay sequencing, while 16 KB flash provides space for a focused firmware image. The 3 V to 5 V supply range can simplify rail planning in products using either 3.3 V or 5 V logic. Final qualification should confirm the required timers, I/O voltage tolerance, reset behavior, and operating-temperature range from the Renesas documentation.
おすすめ
Sensor Conditioning and Monitoring
The R5F21154SP#U0 can serve as the controller in a compact sensor-conditioning module because it combines a 16-bit R8C core with 16 KB of flash at up to 20 MHz. It can acquire samples through suitable analog front-end circuitry, apply calibration and filtering, and format measurements for a downstream communications interface. The integrated flash supports self-contained firmware, and the 20-LSSOP package preserves board area. Analog accuracy, ADC availability, channel multiplexing, and sensor-specific timing must be verified in the complete datasheet before final signal-chain design.
おすすめ
Communication Interface Modules
R5F21154SP#U0 is suitable for small communication interface modules that need local protocol handling and a compact embedded controller. Its 20 MHz maximum operating frequency provides capacity for framing, address management, buffer control, status reporting, and configuration logic in a compact embedded design. The 16 KB flash is adequate for lightweight firmware, and the 3 V to 5 V range can support interface modules built around low-voltage systems. The design must confirm that the selected R8C/15 variant contains every required timer, UART, serial interface, and interrupt resource specified by the communications architecture.
おすすめ
Battery-Powered Portable Accessories
The R5F21154SP#U0 can serve as the control device in low-power portable accessories when the required peripherals and 3 V to 5 V rail are suitable. The 20 MHz R8C/15 core supports responsive user commands and accessory-state management, while the 16 KB flash stores a compact program without an external memory IC. Low-power suitability depends on the specific sleep modes, active current, and wake-up resources listed for the device, which are not included in the supplied snippets. Battery life therefore requires a measured duty-cycle analysis rather than inference from operating frequency alone.
おすすめ
Programmable Logic and Sequencer Products
The R5F21154SP#U0 is a fit for programmable logic, sequencers, and equipment-control products that benefit from 16-bit embedded processing without a high-cost application processor. Its R8C/15 core can execute a state machine, coordinate discrete I/O, and implement timing functions at up to 20 MHz. The 16 KB flash permits field-configurable behavior or firmware updates, and the 20-LSSOP package supports compact assemblies. Engineers should verify the exact peripheral resources and available I/O against the sequencing requirements, and they should include programming and recovery provisions in the production design.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: R5F21154SP#U0 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | R5F21154SP#W4 | R5F21154SP#UO |
|---|---|---|---|
| Package | 20-LSSOP | 20-LSSOP | 20-LSSOP |
| Brand | Renesas Electronics | Renesas Electronics | Renesas Electronics |
| CPU Architecture | 16-bit R8C/1x/15 | 16-bit R8C/1x/15 | 16-bit R8C/1x/15 |
| Maximum Operating Frequency | 20 MHz | 20 MHz | 20 MHz |
| Internal Flash Memory | 16 KB (16K x 8) | 16 KB (16K x 8) | 16 KB (16K x 8) |
| Memory Space | 1 MB | 1 MB | 1 MB |
| Operating Voltage | 3 V to 5 V | 3 V to 5 V | 3 V to 5 V |
| Flash Programming | Single power source | Single power source | Single power source |
主な差別化要因
- Exact family-level alignment in the strongest verified alternative （vs R5F21154SP#W4)
- Single-package 16-bit control with integrated program memory （vs R5F21154SP#UO)
- Verified 3 V to 5 V operating range （vs R5F21154SP#W4)
設計ノート
Design the R5F21154SP#U0 around its verified 3 V to 5 V operating range and place all required bypass capacitors directly beside the corresponding supply pins. Keep switching-regulator and digital return currents out of the MCU ground reference path by using a compact, continuous ground plane and a deliberate quiet-current route. The supplied evidence does not specify capacitor values, ripple limits, or pin-specific decoupling, so those values must come from the Renesas datasheet rather than be inferred.
Use the manufacturer 20-LSSOP footprint and pin-1 orientation without relying solely on the distributor package name. Confirm the actual pin table, programming interface, reset connection, clock components, and exposed I/O functions before routing. Provide a stable ground reference, short power paths, and controlled clock routing. Because the verified data does not contain the complete pin list, this page leaves the pinout null and recommends a direct comparison between the current datasheet and PCB library.
Do not assume that equal package dimensions and equal headline specifications prove that an R5F21154SP ordering suffix is interchangeable. Before substituting R5F21154SP#W4 or R5F21154SP#UO, compare the complete ordering code, temperature range, pin functions, clock limits, memory map, peripheral availability, flash-programming procedure, and lifecycle status. Firmware compatibility also depends on startup code, interrupt behavior, and register definitions, not merely on the 16 KB flash capacity and 20 MHz rating.
Separate sensitive analog or sensor signals from fast digital switching paths and keep programming-related traces away from precision analog inputs. Although the R8C/15 is a digital controller, poor return-current routing can inject noise into the external signal-conditioning circuitry and distort measurements. Use short analog traces, a continuous ground reference, and a deliberate partition between power-conversion, digital, and analog zones. Verify each external network against the final board-level stack-up and component placement.
コンプライアンス情報
The verified Mouser listing identifies R5F21154SP#U0 as Pb-Free. The supplied data does not explicitly establish RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals status.
