R5F21172SP#U0 - 16-Bit 20MHz MCU, 8KB Flash | Renesas
MPN： R5F21172SP#U0 ✗ 停產R5F21172SP#U0 概覽
A microcontroller is a programmable semiconductor that combines a CPU core, memory, peripheral interfaces, and control logic on one integrated circuit. The R8C family is designed for embedded control applications where compact code size, deterministic operation, low-power peripheral handling, and efficient 16-bit instruction processing are important. The R5F21172SP#U0 belongs to the R8C/17 group, which Renesas positions primarily for customers that have already adopted these products; the manufacturer recommends the RL78/G12 group for new designs.
The device combines a 20 MHz maximum clock frequency with 8 KB, or 8K x 8 bits, of flash program memory. Its R8C/Tiny Series core uses a sophisticated CISC-style instruction set intended to improve execution efficiency. The 20-pin LSSOP format provides a relatively compact surface-mount package for embedded systems requiring digital control, serial communication, timing, and discrete input or output handling.
The main architectural consideration is the balance between processing capability and resource constraints. At 20 MHz, the core supports responsive control-loop execution, while the 8 KB flash capacity constrains firmware size and encourages efficient peripheral integration. Because the R8C/17 group is a non-promotion family, engineers should avoid expanding its use in newly designed platforms unless an existing product lineage and software ecosystem justify continuing with it.
Typical uses include compact industrial controllers, sensor-conditioning systems, appliance-control modules, programmable timers, and embedded serial-control equipment. A designer can use the MCU to coordinate analog front ends, digital sensors, communication peripherals, and actuator outputs while keeping the assembly small enough for a 20-pin surface-mount footprint.
Design work should account for the limited 8 KB program space, the 3 V to 5 V operating range, and the vendor's non-promotion position. Firmware should be sized before PCB layout, and the selected development toolchain and peripheral configuration should be checked against the R8C/17 family documentation. Renesas directs new-product development toward the RL78/G12 group.
This product overview consolidates the confirmed processor, memory, speed, voltage, package, and lifecycle information with design guidance, sourcing questions, and alternative-selection considerations. It also highlights the practical distinction between maintaining an existing R8C/17 design and selecting a currently recommended MCU platform for a new project.
直接替換替代品，適用於 R5F21172SP#U0 — 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。
R5F21174DSP#U0
✅ 直接替換📋 參考替代品（不在目錄中）
R5F21172SP#U0 最大額定值與電氣特性
| Microcontroller Type | 16-bit R8C/1x/17 microcontroller |
| CPU Core | R8C/Tiny Series CPU core |
| 最大時脈頻率 | 20 MHz |
| Flash Memory | 8 KB (8K x 8 bits) |
| 工作電源電壓 | 3 V to 5 V |
| Instruction Set | 16-bit CISC-style instruction set |
| Manufacturing Process | High-performance silicon gate CMOS |
| Package Type | 20-pin plastic molded LSSOP |
| 安裝類型 | Surface mount |
| Package Width | 4.40 mm |
| Package Length | 0.173 inch |
| 工作溫度 | -20 °C to +85 °C |
| Lead-Free Status | Pb-free |
R5F21172SP#U0 0.173 inch 腳位配置指南
R5F21172SP#U0（0.173 inch 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： R5F21172SP#U0.
請參閱 資料表 以查看完整腳位配置。
典型應用
R5F21172SP#U0 適用於 6 應用s: Compact Industrial Control Modules, Sensor Conditioning and Data Acquisition, Appliance and Equipment Control, Programmable Timer and Sequencer, Embedded Serial Communication Equipment, Legacy Product Line Maintenance.
Compact Industrial Control Modules
The R5F21172SP#U0 fits compact controller modules that coordinate sensors, digital inputs, timers, and actuator-control outputs from a 3 V to 5 V supply. Its 20 MHz R8C/Tiny Series core provides useful execution headroom for deterministic control routines, while the 20-pin LSSOP preserves board area. The main constraint is the confirmed 8 KB flash capacity, so firmware must be sized around code density and peripheral-library overhead. For new industrial platforms, Renesas recommends evaluating the RL78/G12 group; the R5F21172SP#U0 is strongest for established R8C/17 product continuity.
Sensor Conditioning and Data Acquisition
The R5F21172SP#U0 can serve as the control processor in a small sensor-conditioning assembly that samples digital inputs, applies calibration logic, manages timing, and prepares data for a serial link. Its 16-bit R8C/Tiny Series architecture and 20 MHz clock are appropriate for modest real-time control tasks, and the 20-pin LSSOP supports compact board layouts. Because the device offers 8 KB of flash, measurement tables and protocol code must be checked against memory limits. A production design should also confirm the exact available RAM and the required timer and serial-interface resources.
Appliance and Equipment Control
For appliance controllers, the R5F21172SP#U0 can implement operating-state logic, button handling, timing sequences, motor or heater interlocks, and low-cost status indication within a 3 V to 5 V system. Its compact 20-pin package and moderate 20 MHz processing rate support economical embedded control without requiring a larger pin count. Firmware must remain within the 8 KB flash budget, and the available RAM and peripheral mix should be validated early. The device is most appropriate when extending an existing R8C/17 appliance platform rather than beginning a newly designed product.
Programmable Timer and Sequencer
The R5F21172SP#U0 can be used in a programmable timer, sequencer, or event-control subsystem where deterministic timing and compact embedded logic are more important than high memory capacity. The 16-bit core and 20 MHz maximum operating frequency support responsive multitasking and peripheral coordination, while the 20-pin LSSOP is practical for space-constrained boards. Verify the required timer channels, interrupt behavior, and available RAM against the R8C/17 documentation. With only 8 KB of flash, state tables and long diagnostic routines may need to be placed in external storage or simplified.
Embedded Serial Communication Equipment
The R5F21172SP#U0 can act as a protocol controller or command processor in compact equipment that exchanges data over configured serial interfaces. Its 20 MHz R8C/Tiny Series core can execute framing, validation, and state-machine tasks, and the 3 V to 5 V operating range fits common embedded supply rails. The designer must confirm the exact UART or other interface options and their electrical requirements for the selected R8C/17 variant. Protocol tables should be tested against the 8 KB flash limit, and the non-promotion family status makes this choice most appropriate for maintenance of existing serial-control products.
Legacy Product Line Maintenance
The R5F21172SP#U0 is especially relevant to factories, service organizations, and equipment makers maintaining an established R8C/17 control platform. Replacing a failed MCU with the same ordering code can preserve board layout, firmware behavior, and qualification work, subject to availability. Renesas states that the group is supported for customers that have already adopted it, making lifecycle continuity the central design consideration. Teams should still monitor notices for non-promotion devices, forecast demand, and evaluate an RL78/G12 migration when a major redesign offers sufficient schedule and validation capacity.
工程參考資料，適用於 R5F21172SP#U0 — 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 | R5F21174DSP#U0 |
|---|---|---|
| Brand | Renesas Electronics | Renesas Electronics |
| Package | 20-LSSOP | 20-LSSOP |
| CPU Core | R8C/Tiny Series | R8C/17 family variant |
| Instruction Width | 16 bit | 16 bit |
主要差異化特點
- Confirmed 8 KB flash configuration for the specified ordering code (對比R5F21174DSP#U0)
- Confirmed 20 MHz maximum operating frequency (對比R5F21174DSP#U0)
- Defined 20-LSSOP package for PCB continuity (對比R5F21174DSP#U0)
設計說明
Do not treat family similarity as proof of software or hardware compatibility. The R5F21172SP#U0 has 8 KB of flash, while alternate R8C/17 variants may differ in memory and peripheral resources. Before replacing the MCU, compare the complete pin-description table, electrical limits, clock requirements, RAM size, interrupt assignments, and peripheral configuration. Revalidate bootloader behavior and firmware size because an apparently similar ordering code can require different code-generation settings.
Plan the 3 V to 5 V supply and decoupling around the manufacturer's operating-characteristics limits. Place the input and output capacitors at the pins specified by the reference circuit, keep the high-current return path short, and avoid routing switching-node copper beneath the microcontroller. Confirm regulator tolerance, startup behavior, and the maximum operating frequency used by the final firmware. These checks are particularly important when retaining this non-promotion MCU in a longer-life industrial product.
Use the manufacturer's 20-pin LSSOP land pattern and preserve the orientation marks when replacing the device. Keep programming and debug access reachable, maintain adequate copper for thermal conduction, and isolate sensitive analog or communication routes from fast digital edges. Because the board must support a non-promotion MCU for maintenance purposes, document the exact ordering code and package revision clearly so assemblers do not substitute an electrically or mechanically different family member.
Keep clock, reset, and decoupling connections short and follow the layout shown in the Renesas family reference materials. Assign external support components according to the selected oscillator or clock configuration rather than assuming a pinout shared with another R8C/17 variant. Leave programming pads accessible when the enclosure permits it, and review unused-pin treatment in the manufacturer pin table before release. This reduces rework risk when an older assembly is serviced in the field.
合規資訊
The distributor product classification identifies R5F21172SP#U0 as Pb-free. Formal RoHS, REACH, halogen-free, conflict-minerals, and automotive-qualification documentation should be checked for the exact ordering code.
