R5F21103DFP#U0 Equivalent & Substitute Parts

Part Overview

The R5F21103DFP#U0 is a 16-bit microcontroller from Renesas Electronics Corporation's R8C/1x/10 series, featuring 12KB FLASH memory and operating at 16MHz. This device is classified as obsolete, making identification of compatible substitute parts essential for ongoing system support, redesigns, and production continuity. The R8C core architecture with integrated peripherals including UART/USART connectivity, SIO interface, and 8-channel 10-bit analog-to-digital conversion serves embedded control applications requiring low-power operation across the 2.7V to 5.5V supply range.

Key Parameters

Parameter	R5F21103DFP#U0
Core Processor	R8C
Core Size	16-Bit
Speed	16MHz
Program Memory Size	12KB (12K x 8)
Program Memory Type	FLASH
RAM Size	768 x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V
Data Converters	A/D 8x10b
Number of I/O	22
Package / Case	32-LQFP (7x7)
Operating Temperature	-40°C ~ 85°C (TA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the R5F21103DFP#U0 is determined by the following critical parameters:

Core Architecture: Both main and substitute parts must use the R8C core processor to ensure instruction set compatibility and firmware portability.
Package Type: The 32-LQFP (7x7) surface mount package is mandatory for PCB layout compatibility without redesign.
Voltage Supply Range: Operating voltage must encompass or exceed the original 2.7V ~ 5.5V range to maintain system functionality across supply variations.
Memory Configuration: Program memory (FLASH) and RAM must meet or exceed the original specifications to support existing firmware without modification.
Connectivity Interfaces: UART/USART and SIO interfaces must be present to maintain communication protocol compatibility.
Compliance Standards: RoHS3 compliance and REACH unaffected status ensure regulatory alignment.

The R5F21264SDFP#V2 qualifies as a substitute based on these criteria, offering enhanced specifications while maintaining core compatibility.

Parameter Comparison

Parameter	R5F21103DFP#U0	R5F21264SDFP#V2
Core Processor	R8C	R8C
Core Size	16-Bit	16-Bit
Speed	16MHz	20MHz
Program Memory Size	12KB (12K x 8)	16KB (16K x 8)
Program Memory Type	FLASH	FLASH
RAM Size	768 x 8	1K x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V	2.2V ~ 5.5V
Data Converters	A/D 8x10b	A/D 12x10b
Number of I/O	22	25
Connectivity	SIO, UART/USART	I2C, LINbus, SIO, SSU, UART/USART
Peripherals	LED, WDT	LED, POR, Voltage Detect, WDT
Package / Case	32-LQFP (7x7)	32-LQFP (7x7)
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The R5F21264SDFP#V2 is the qualified substitute for the obsolete R5F21103DFP#U0. Selection is based on the following engineering criteria:

Product Status: The R5F21264SDFP#V2 maintains active product status, ensuring long-term availability and manufacturing support compared to the obsolete R5F21103DFP#U0.
Regulatory Compliance: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying current environmental and safety requirements.
Core Compatibility: Identical R8C core processor and 16-bit architecture preserve instruction set compatibility, allowing firmware migration with minimal or no modification.
Package Compatibility: Identical 32-LQFP (7x7) package eliminates PCB redesign requirements.
Enhanced Specifications: The substitute provides increased program memory (16KB vs. 12KB), expanded RAM (1K x 8 vs. 768 x 8), higher clock speed (20MHz vs. 16MHz), and extended analog conversion channels (12x10b vs. 8x10b), supporting more demanding applications without functional compromise.
Extended Voltage Range: The lower minimum supply voltage (2.2V vs. 2.7V) provides greater operational flexibility in low-power applications.

Frequently Asked Questions (FAQ)

Q: Can the R5F21264SDFP#V2 directly replace the R5F21103DFP#U0 without firmware changes?

A: Yes. Both devices use the identical R8C core processor and 16-bit architecture. Existing firmware compiled for the R5F21103DFP#U0 will execute on the R5F21264SDFP#V2 without modification. The substitute's enhanced memory and peripheral capabilities do not conflict with original firmware.

Q: Are there PCB layout considerations when substituting these parts?

A: No. Both parts use the identical 32-LQFP (7x7) package with matching pin assignments. Direct socket replacement is possible without PCB redesign.

Q: What is the significance of the R5F21103DFP#U0 being classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Renesas Electronics Corporation. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Substitution with the active R5F21264SDFP#V2 ensures production continuity and future availability.

Q: Does the higher clock speed of the R5F21264SDFP#V2 (20MHz vs. 16MHz) require firmware optimization?

A: No optimization is required. The substitute operates at a higher clock speed, which improves performance without introducing incompatibility. Existing firmware will execute correctly at the increased speed.

Q: Are the connectivity interfaces compatible between these parts?

A: The R5F21103DFP#U0 provides SIO and UART/USART interfaces. The R5F21264SDFP#V2 includes these interfaces plus I2C, LINbus, and SSU. Firmware utilizing only the original SIO and UART/USART interfaces will function identically on the substitute.

Q: What compliance certifications apply to both parts?

A: Both the R5F21103DFP#U0 and R5F21264SDFP#V2 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

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