UPD78F0484GK-GAK-AX Equivalent & Substitute Parts

Part Overview

The UPD78F0484GK-GAK-AX is an 8-bit microcontroller from Renesas Electronics Corporation's 78K0/Lx3 series, featuring 48KB FLASH memory and operating at 10MHz. This device is classified as obsolete, making identification of functionally compatible alternatives essential for ongoing system support and new design considerations. The 80-LQFP package and specific peripheral configuration require careful evaluation when selecting substitute components.

Substiute Parts

UPD78F0484GK-GAK-AX

Renesas Electronics CorporationIn Stock: 1197UPD78F0484GK-GAK-AX Datasheet

Current PartRFQ

R5F110PEAFB#30

Renesas Electronics CorporationIn Stock: 1518R5F110PEAFB#30 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

The R5F110PEAFB#30 is identified as a substitute based on the following substitution criteria:

Manufacturer Continuity: Both devices are manufactured by Renesas Electronics Corporation, ensuring consistent design philosophy, support infrastructure, and documentation standards.

Core Functionality: While the substitute represents an architectural upgrade (16-bit RL78 core versus 8-bit 78K/0 core), it provides expanded memory capacity (64KB FLASH versus 48KB), enhanced processing speed (24MHz versus 10MHz), and extended peripheral integration (CSI, I2C, USB connectivity in addition to existing interfaces).

Voltage Supply Compatibility: The substitute operates within 1.6V ~ 3.6V, which overlaps with the original device's 1.8V ~ 5.5V range at the lower end, supporting low-power applications.

Peripheral Feature Parity: Both devices include LCD, LVD, POR, PWM, and WDT peripherals, maintaining core functionality for typical embedded applications.

Compliance Alignment: Both components maintain ROHS3 compliance, identical MSL rating (3, 168 Hours), and EAR99 ECCN classification.

Package Consideration: The substitute uses 100-LFQFP packaging versus the original 80-LQFP, requiring PCB layout redesign and increased pin count management.

Parameter Comparison

Engineering Selection Recommendations

Selection of the R5F110PEAFB#30 as a substitute for the UPD78F0484GK-GAK-AX is supported by the following engineering factors:

Product Status Alignment: The original device is obsolete, while the substitute maintains active product status with ongoing manufacturer support and availability.

Compliance Certification: Both components maintain identical ROHS3 compliance, MSL rating, and ECCN classification, ensuring regulatory and supply chain continuity.

Manufacturer Support: Renesas Electronics Corporation provides consistent technical documentation, development tools, and long-term availability for the RL78/L1C series.

Memory and Processing Capacity: The substitute provides increased program memory (64KB versus 48KB), RAM (8K x 8 versus 2K x 8), and processing speed (24MHz versus 10MHz), enabling migration of existing firmware with potential for enhanced functionality.

Peripheral Integration: The addition of CSI, I2C, and USB connectivity in the substitute expands system integration capabilities while maintaining core LCD, LVD, POR, PWM, and WDT functionality.

Design Consideration: PCB redesign is required due to package change from 80-LQFP to 100-LFQFP, necessitating layout modification and increased pin routing complexity.

Frequently Asked Questions (FAQ)

Q: Can the R5F110PEAFB#30 directly replace the UPD78F0484GK-GAK-AX without firmware modification?

A: Direct pin-for-pin replacement is not possible due to package differences (80-LQFP versus 100-LFQFP). Firmware compatibility depends on application-specific code. The 16-bit architecture of the substitute requires evaluation of existing 8-bit code for compatibility with the RL78 instruction set.

Q: What are the voltage supply constraints when substituting these devices?

A: The original device operates at 1.8V ~ 5.5V, while the substitute operates at 1.6V ~ 3.6V. Applications requiring supply voltages above 3.6V cannot use the substitute without external voltage regulation.

Q: How do the memory specifications affect substitution decisions?

A: The substitute provides 64KB FLASH (versus 48KB) and 8K x 8 RAM (versus 2K x 8), offering increased program and data storage. Applications limited by the original device's 48KB FLASH memory may benefit from the expanded capacity.

Q: Are there connectivity differences that impact system integration?

A: The substitute adds CSI, I2C, and USB interfaces beyond the original device's 3-Wire SIO, LINbus, and UART/USART. Existing designs using only the original connectivity set remain compatible, while new designs can leverage expanded interface options.

Q: What packaging considerations apply to this substitution?

A: The package change from 80-LQFP to 100-LFQFP requires PCB redesign, including increased pin count management, modified trace routing, and updated footprint definitions. The 100-LFQFP package dimensions are 14x14mm.

Q: Is the substitute suitable for applications requiring the original 10MHz speed specification?

A: The substitute operates at 24MHz, exceeding the original 10MHz specification. Applications designed for 10MHz operation function correctly at the higher speed, though power consumption and thermal characteristics may differ.