R5F121BCAFP#10 Equivalent & Substitute Parts

Part Overview

The R5F121BCAFP#10 is a 16-bit microcontroller from Renesas Electronics Corporation's RL78/G16 series, designed for embedded applications requiring moderate processing capability and integrated connectivity. This device features 32KB of Flash program memory, 2KB of RAM, and 1KB of EEPROM, operating across a wide supply voltage range of 2.4V to 5.5V. The part is actively produced and widely available in inventory, with 619 units currently in stock. Substitute parts are identified when identical electrical specifications and mechanical packaging are maintained, ensuring direct functional equivalence in system designs.

Key Parameters

Parameter	Value
Manufacturer	Renesas Electronics Corporation
Series	RL78/G16
Core Processor	RL78
Core Size	16-Bit
Speed	16MHz
Program Memory Size	32KB (32K x 8)
Program Memory Type	FLASH
RAM Size	2K x 8
EEPROM Size	1K x 8
Voltage Supply (Vcc/Vdd)	2.4V ~ 5.5V
Package / Case	32-LQFP (7x7)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the R5F121BCAFP#10 is determined by strict equivalence across the following critical parameters:

Processor Architecture: RL78 core with 16-bit instruction set
Memory Configuration: 32KB Flash, 2KB RAM, 1KB EEPROM
Operating Frequency: 16MHz
Supply Voltage Range: 2.4V to 5.5V
Package Specification: 32-LQFP (7x7) surface mount
Connectivity Interfaces: CSI, I2C, SPI, UART/USART
Peripheral Set: Capacitive Touch, POR, PWM, Voltage Detect, WDT
I/O Count: 29 pins
Data Converter: A/D 11x8/10b

The R5F121BCAFP#30 qualifies as a parametric equivalent because it maintains identical specifications across all electrical and mechanical parameters. The difference between these part numbers reflects packaging tape configuration (reel type designation), not functional or performance characteristics.

Parameter Comparison

Parameter	R5F121BCAFP#10	R5F121BCAFP#30	Match
Manufacturer	Renesas Electronics Corporation	Renesas Electronics Corporation	✓
Series	RL78/G16	RL78/G16	✓
Core Processor	RL78	RL78	✓
Core Size	16-Bit	16-Bit	✓
Speed	16MHz	16MHz	✓
Program Memory Size	32KB (32K x 8)	32KB (32K x 8)	✓
Program Memory Type	FLASH	FLASH	✓
RAM Size	2K x 8	2K x 8	✓
EEPROM Size	1K x 8	1K x 8	✓
Voltage Supply (Vcc/Vdd)	2.4V ~ 5.5V	2.4V ~ 5.5V	✓
Data Converters	A/D 11x8/10b	A/D 11x8/10b	✓
Oscillator Type	External, Internal	External, Internal	✓
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	✓
Mounting Type	Surface Mount	Surface Mount	✓
Package / Case	32-LQFP (7x7)	32-LQFP (7x7)	✓
Number of I/O	29	29	✓
Connectivity	CSI, I2C, SPI, UART/USART	CSI, I2C, SPI, UART/USART	✓
Peripherals	Capacitive Touch, POR, PWM, Voltage Detect, WDT	Capacitive Touch, POR, PWM, Voltage Detect, WDT	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
REACH Status	REACH Unaffected	REACH Unaffected	✓
Product Status	Active	Active	✓

Engineering Selection Recommendations

Both the R5F121BCAFP#10 and R5F121BCAFP#30 are active production parts from Renesas Electronics Corporation with full compliance to ROHS3 and REACH regulations. Selection between these parts should be based on supply chain availability and procurement requirements rather than technical performance, as they are functionally identical.

The R5F121BCAFP#30 currently maintains higher inventory availability (2649 units) compared to the R5F121BCAFP#10 (619 units), making it suitable for high-volume production runs or applications with extended lead time requirements. Both parts meet the same environmental and regulatory standards, ensuring equivalent reliability and compliance in end-use applications.

Frequently Asked Questions (FAQ)

Q: Are R5F121BCAFP#10 and R5F121BCAFP#30 functionally identical?

A: Yes. Both parts are parametrically equivalent across all electrical specifications, memory configuration, operating frequency, supply voltage range, package dimensions, and peripheral functionality. The suffix designation (#10 vs #30) indicates packaging tape configuration only and does not affect device performance or compatibility.

Q: Can I substitute R5F121BCAFP#30 for R5F121BCAFP#10 in existing designs?

A: Yes. No design modifications are required. The parts are pin-compatible, electrically equivalent, and mechanically identical in the 32-LQFP (7x7) package. PCB layout, firmware, and system integration remain unchanged.

Q: What determines substitution eligibility for RL78/G16 microcontrollers?

A: Substitution is valid when the following parameters match: processor core (RL78), core size (16-bit), operating frequency (16MHz), memory sizes (32KB Flash, 2KB RAM, 1KB EEPROM), supply voltage range (2.4V–5.5V), package type (32-LQFP 7x7), I/O count (29 pins), and peripheral set (CSI, I2C, SPI, UART/USART, Capacitive Touch, POR, PWM, Voltage Detect, WDT).

Q: Are there any compliance or certification differences between these parts?

A: No. Both parts carry identical RoHS3 compliance and REACH Unaffected status. They meet the same regulatory and environmental standards for industrial and commercial applications.

Q: Which part should I select for new designs?

A: Either part is suitable for new designs. Selection should be based on supplier availability and procurement lead times. The R5F121BCAFP#30 offers higher current inventory levels, which may reduce procurement delays for volume production.

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