R5F21142SP#U0 16-Bit 20MHz 8KB MCU | Renesas Electronics
部品番号: R5F21142SP#U0 ✗ 生産終了R5F21142SP#U0 概要
A microcontroller is an integrated circuit that combines a processor core, program memory, data memory, peripherals, and input/output functions in one package. The R8C/Tiny Series CPU core used by this device provides the execution environment for embedded control logic, while the 8 KB flash provides program storage for firmware. This MCU belongs to the broader hierarchy of microcontrollers, embedded processors, and semiconductors used in industrial, consumer, and communication equipment.
The R5F21142SP#U0 combines a 20 MHz maximum operating frequency with 16-bit processing and 8 KB flash in a 20-LSSOP package. Verified distributor information identifies the R8C/1x/14 family and describes the device as a 16-bit MCU with 8K x 8 flash. The package is identified as 20-LSSOP with a stated width of 4.40 mm. The available verified data does not specify RAM size, peripheral details, pin names, operating temperature, or electrical limits, so those values should be confirmed in the manufacturer datasheet before design release.
The manufacturer describes the R8C/14 Group as using a high-performance silicon-gate CMOS process and an R8C/Tiny Series CPU core. It also states that the group is supported for customers that have already adopted these products, while recommending the RL78/G12 Group for new designs. This lifecycle statement is important when selecting a replacement for an existing R8C design because migration to a different MCU family may require software, toolchain, and board-level changes.
Typical uses for this device include compact industrial controllers, peripheral controllers, instrumentation, and legacy embedded platforms where the existing R8C software and 20-LSSOP footprint are already established. The 3/5 V operating capability can support systems that need compatibility with conventional 3.3 V or 5 V logic environments. The available information does not identify a specific reference design or application circuit, so those applications should be treated as general application categories rather than manufacturer-qualified examples.
For PCB design, confirm the exact 20-pin LSSOP land pattern, exposed-pad requirements, recommended decoupling, programming interface, and pin multiplexing against the official datasheet. Do not infer missing pin functions from the package outline. Because this is a non-promotion MCU, production planning should also verify lifecycle status, software-tool availability, and the availability of a suitable replacement before committing to new platform designs.
This page consolidates the verified distributor and manufacturer information for R5F21142SP#U0, including pricing, package details, lifecycle context, sourcing links, and practical selection considerations. It distinguishes documented R8C/14 characteristics from parameters that remain unavailable in the supplied data, helping engineers make an evidence-based sourcing decision.
ドロップイン代替品: R5F21142SP#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。
R5F21142SP#W4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
R5F21142SP#U0 最大定格＆電気的特性
| Product Type | 16-bit single-chip microcomputer |
| CPU Core | R8C/Tiny Series R8C core |
| Product Family | R8C/14 Group |
| Maximum Operating Frequency | 20 MHz |
| Flash Memory | 8 KB (8K x 8) |
| CPU Word Length | 16 bit |
| Operating Voltage | 3/5 V |
| パッケージ | 20-LSSOP |
| Package Width | 4.40 mm |
| Package Pins | 20 pins |
| 実装タイプ | Surface mount |
| Process Technology | High-performance silicon-gate CMOS |
| Lead-Free Status | Pb-free |
R5F21142SP#U0 20 pins ピン配置ガイド
R5F21142SP#U0 (20 pins 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: R5F21142SP#U0.
詳細は データシート をご参照ください。
主な用途
R5F21142SP#U0 の用途: 6 件s: Industrial Control Modules, Instrumentation and Measurement, Peripheral Controllers, Consumer Appliance Controls, Communication Equipment Interfaces, Legacy Product Maintenance.
Industrial Control Modules
The R5F21142SP#U0 fits legacy industrial-control modules where the existing platform already uses the R8C/14 software toolchain and 20-LSSOP footprint. Its 16-bit R8C/Tiny Series CPU core operates up to 20 MHz, while 8 KB of flash provides program storage for compact control sequences, state-machine logic, and peripheral coordination. The verified 3/5 V operating specification supports conventional embedded-control environments. Because Renesas classifies this group as supported mainly for customers that have already adopted it, the strongest use case is maintenance and continuation of an established controller rather than a new machine platform. Firmware size, RAM availability, peripheral resources, and electrical limits must be checked in the official datasheet before assigning additional control functions.
おすすめ
Instrumentation and Measurement
R5F21142SP#U0 is appropriate for maintaining an existing measurement instrument that depends on an R8C/14-compatible board and firmware environment. The 20 MHz maximum clock and 16-bit instruction architecture provide more processing capability than a basic 8-bit controller, while the 8 KB flash stores the established application program. Its 3/5 V operating capability allows integration with conventional 3.3 V and 5 V peripheral arrangements. The verified package is 20-LSSOP, which helps preserve a compact controller board. Before using it for new measurement functions, verify timer resolution, ADC availability, RAM capacity, and pin multiplexing; none of those detailed resource values is present in the supplied verified snippets and must be confirmed from the manufacturer documentation.
おすすめ
Peripheral Controllers
The R5F21142SP#U0 can continue to serve as the dedicated controller in an established peripheral subsystem, particularly when replacing a failed R8C board without redesigning its mechanical enclosure or wiring. Its 20-LSSOP package is compact, and its verified 20 MHz clock and 8 KB flash are sufficient for targeted control and communication firmware already developed for the device. The 3/5 V operating specification supports integration with conventional control logic. Pin-level compatibility is not fully documented in the supplied snippets, so engineers must compare the official 20-pin diagram, power pins, I/O levels, programming signals, and peripheral mappings with the board being serviced. This application should be treated as product-continuity work rather than a fresh architecture choice.
おすすめ
Consumer Appliance Controls
R5F21142SP#U0 is relevant to an existing appliance-control product that was built around the R8C/14 platform and has a stable 20-LSSOP layout. The microcontroller combines a 16-bit R8C core, 20 MHz operation, and 8 KB flash, which can execute established sequencing, state management, and user-interface logic. Its 3/5 V operating capability is compatible with common appliance-control voltage environments. The verified information does not state RAM, ADC, timer, or communication resources, so appliance functions requiring new sensing channels should not be assigned without checking the datasheet. Renesas's non-promotion position on the R8C/14 Group also means this choice is best suited to product continuation and cost-controlled maintenance rather than new appliance development.
おすすめ
Communication Equipment Interfaces
The R5F21142SP#U0 may be used in an established communication-equipment interface where the board and firmware depend on R8C/14 behavior. Its 16-bit architecture and 20 MHz operating rate can support protocol handling, status monitoring, and configuration logic for an existing embedded subsystem. The verified 3/5 V operation allows use with conventional 3.3 V or 5 V interface electronics, while the 20-LSSOP package supports compact board layouts. The supplied results do not identify UART, SPI, I2C, CAN, or other serial-interface resources, so communications capability must be verified directly in the manufacturer documentation. For new networking or protocol-development programs, Renesas explicitly recommends considering the RL78/G12 Group instead of adopting this non-promotion MCU family.
おすすめ
Legacy Product Maintenance
R5F21142SP#U0 is most defensible for long-running products that already use the R8C/14 ecosystem and need a continuity supply for repair, assembly, or certified-product maintenance. The non-promotion statement from Renesas indicates that the group remains supported primarily for customers with prior adoption, which can make an exact platform continuation more practical than an architectural migration. The 20 MHz R8C core, 8 KB flash, 3/5 V operation, and 20-LSSOP package align with the documented device identity. Procurement teams should obtain lot traceability and lifecycle confirmation because distributor inventory is finite. Any proposed substitute must be checked for identical pin functions, memory organization, clock settings, timing, and firmware compatibility rather than relying on package appearance alone.
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: R5F21142SP#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 | R5F21142SP#W4 |
|---|---|---|
| Package | 20-LSSOP | 20-LSSOP |
| Brand | Renesas Electronics | Renesas Electronics |
| CPU Architecture | 16-bit R8C/Tiny Series core | 16-bit R8C/Tiny Series core |
| Product Family | R8C/14 Group | R8C/1x/14 |
| Maximum Frequency | 20 MHz | 20 MHz |
| Flash Memory | 8 KB (8K x 8) | 8 KB (8K x 8) |
主な差別化要因
- Identified R8C/14 device continuity （vs R5F21142SP#W4)
- Same documented processor and memory configuration （vs R5F21142SP#W4)
- Established 3/5 V integration class （vs R5F21142SP#W4)
設計ノート
Do not treat the 20-LSSOP package as sufficient evidence of drop-in compatibility. Before replacing R5F21142SP#U0, compare the official pin table, power-supply pins, reset behavior, oscillator connections, programming interface, and all peripheral functions with the existing board. The supplied snippets do not include the individual pin assignments, so an inferred footprint-compatible replacement could still cause boot failure, programming difficulty, or incorrect peripheral operation.
For board-level replacement, verify the manufacturer land pattern for 20-LSSOP, including lead pitch, body width, and solderable land geometry. The verified distributor description identifies a 4.40 mm body width and 20-pin surface-mount package, but those facts alone do not establish complete PCB compatibility. Inspect copper, solder mask, paste, courtyard, and assembly clearances against the actual datasheet drawing before approving the substitution.
Design the supply path around the verified 3/5 V operating class, then confirm the exact minimum and maximum voltage ratings and I/O thresholds in the manufacturer datasheet. Place the required bypass capacitors at the device power pins according to the reference circuit, and account for startup and reset requirements. The supplied data does not identify capacitor values or supply-current limits, so those figures must not be guessed.
The R8C/14 Group is a non-promotion family, and Renesas recommends the RL78/G12 Group for new designs. Avoid starting a new platform around R5F21142SP#U0 unless legacy software, qualification, or certification economics clearly justify it. Also distinguish a same-ordering-code variant from a genuinely different replacement: R5F21142SP#W4 matches the listed core specifications, but the supplied data does not define the suffix difference.
コンプライアンス情報
The verified Mouser listing identifies R5F21142SP#U0 as Pb-free. The supplied data does not explicitly state RoHS, REACH, AEC-Q100, halogen-free, or conflict-minerals status.
