R5F21237DFP#U0 Equivalent & Substitute Parts

Part Overview

The R5F21237DFP#U0 is a 16-bit microcontroller from Renesas Electronics Corporation's R8C/2x/23 series, featuring 48KB FLASH memory and operating at 20MHz. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The part is housed in a 48-LQFP (7x7) surface mount package and supports multiple communication protocols including CANbus, I2C, LINbus, and UART/USART.

Key Parameters

Parameter	Value
Manufacturer	Renesas Electronics Corporation
Series	R8C/2x/23
Core Processor	R8C
Core Size	16-Bit
Speed	20MHz
Program Memory Size	48KB (48K x 8)
Program Memory Type	FLASH
EEPROM Size	2K x 8
RAM Size	2.5K x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V
Number of I/O	41
Package / Case	48-LQFP (7x7)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution for the R5F21237DFP#U0 is based on the following critical parameters:

Package Compatibility: All substitute parts maintain the 48-LQFP (7x7) surface mount package, ensuring PCB-level compatibility without layout modifications.
Core Architecture: Substitute parts utilize the RL78 processor core, representing Renesas' successor architecture to the R8C series.
Memory Configuration: Substitute parts provide equal or greater FLASH memory capacity (64KB minimum) and expanded RAM resources.
Voltage Supply Range: All substitutes operate within or exceed the original 2.7V ~ 5.5V supply range, with R5F11BGEAFB#30 extending to 1.6V minimum.
Communication Protocols: Substitute parts retain I2C, LINbus, and UART/USART connectivity; CANbus support is not present in RL78 variants.
Compliance: All parts maintain ROHS3 compliance and MSL 3 rating.

Parameter Comparison

Parameter	R5F21237DFP#U0 (Main)	R5F104GDGFB#30	R5F104GEGFB#30	R5F11BGEAFB#30
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation	Renesas Electronics Corporation	Renesas Electronics Corporation
Series	R8C/2x/23	RL78/G14	RL78/G14	RL78/G1F
Core Processor	R8C	RL78	RL78	RL78
Core Size	16-Bit	16-Bit	16-Bit	16-Bit
Speed	20MHz	32MHz	32MHz	32MHz
Program Memory Size	48KB (48K x 8)	64KB (64K x 8)	64KB (64K x 8)	64KB (64K x 8)
EEPROM Size	2K x 8	4K x 8	4K x 8	4K x 8
RAM Size	2.5K x 8	5.5K x 8	12K x 8	5.5K x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V	2.4V ~ 5.5V	2.4V ~ 5.5V	1.6V ~ 5.5V
Number of I/O	41	58	58	44
Package / Case	48-LQFP (7x7)	48-LFQFP (7x7)	48-LFQFP (7x7)	48-LQFP (7x7)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 105°C (TA)	-40°C ~ 105°C (TA)	-40°C ~ 85°C (TA)
Product Status	Obsolete	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

All three substitute parts are active products from Renesas Electronics Corporation, providing long-term availability and production support compared to the obsolete R5F21237DFP#U0.

R5F104GDGFB#30 and R5F104GEGFB#30 (RL78/G14 series): These parts offer identical core functionality with increased processing speed (32MHz vs. 20MHz) and expanded I/O count (58 vs. 41). The extended operating temperature range (-40°C ~ 105°C) provides additional thermal margin. R5F104GEGFB#30 features 12K x 8 RAM compared to 5.5K x 8 in R5F104GDGFB#30, supporting applications with higher memory requirements.

R5F11BGEAFB#30 (RL78/G1F series): This part maintains the original operating temperature range (-40°C ~ 85°C) and provides the lowest minimum supply voltage (1.6V), enabling ultra-low-power applications. It includes integrated D/A conversion (1x8b) and expanded A/D resolution (17x10b) compared to the main part's 12x10b configuration. I/O count (44) falls between the main part and RL78/G14 variants.

All substitute parts maintain ROHS3 compliance and MSL 3 rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can R5F104GDGFB#30 or R5F104GEGFB#30 directly replace R5F21237DFP#U0 without firmware modification?

A: Package and pinout compatibility are maintained (48-LQFP 7x7), but firmware adaptation is required due to architectural differences between R8C and RL78 processor cores. Peripheral register maps, interrupt structures, and instruction sets differ between series.

Q: What is the primary difference between R5F104GDGFB#30 and R5F104GEGFB#30?

A: Both are RL78/G14 variants with identical core speed (32MHz), package, and I/O count (58). The primary distinction is RAM capacity: R5F104GEGFB#30 provides 12K x 8 versus 5.5K x 8 in R5F104GDGFB#30. Selection depends on application memory requirements.

Q: Why does R5F11BGEAFB#30 have a lower minimum supply voltage (1.6V)?

A: The RL78/G1F series is optimized for ultra-low-power applications. The extended voltage range enables operation in battery-powered and energy-harvesting systems where supply voltage may drop below 2.4V.

Q: Are CANbus and SSU connectivity available in substitute parts?

A: No. The RL78/G14 and RL78/G1F series support I2C, LINbus, CSI, and UART/USART. CANbus and SSU protocols present in the R8C/2x/23 series are not available in these RL78 variants. Applications requiring CANbus must evaluate alternative Renesas product lines.

Q: What is the impact of the 32MHz speed increase in substitute parts?

A: Substitute parts operate at 32MHz versus the original 20MHz, providing 60% higher processing throughput. This enables faster execution of control algorithms and reduced latency in real-time applications. Power consumption may increase proportionally with clock frequency.

Q: Are all substitute parts available in Tray packaging?

A: R5F104GDGFB#30 and R5F104GEGFB#30 are supplied in Tray packaging. R5F11BGEAFB#30 packaging specification is also Tray. Confirm packaging requirements with your procurement specification.

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