DF36074LFZV Equivalent & Substitute Parts

Part Overview

The DF36074LFZV is a 16-bit H8/300H Tiny microcontroller manufactured by Renesas Electronics Corporation, featuring 32KB FLASH memory and a 64-LFQFP package. This device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, redesigns, and production continuity. The part operates at 16MHz with a 3V to 3.6V supply range and includes integrated peripherals such as I2C, SCI connectivity, PWM, watchdog timer, and low-voltage detection.

Substiute Parts

DF36074LFZV

Renesas Electronics CorporationIn Stock: 821DF36074LFZV Datasheet

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STM32L051R6T6

STMicroelectronicsIn Stock: 836304STM32L051R6T6 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DF36074LFZV is determined by the following critical parameters:

Package Compatibility: Both the main part and substitute must use the 64-LQFP (10x10) surface mount package to ensure PCB footprint compatibility without redesign.

Memory Configuration: The 32KB FLASH program memory is a baseline requirement. The substitute STM32L051R6T6 meets this specification with identical 32KB FLASH capacity.

I/O Pin Count: The DF36074LFZV provides 47 I/O pins. The STM32L051R6T6 provides 51 I/O pins, offering additional I/O capability within the same package footprint.

Supply Voltage Range: The DF36074LFZV operates at 3V to 3.6V. The STM32L051R6T6 operates at 1.65V to 3.6V, providing a wider supply range that encompasses the original specification.

Connectivity and Peripherals: Both devices include I2C connectivity and PWM functionality. The STM32L051R6T6 provides extended connectivity options (IrDA, SPI, UART/USART) and additional peripherals (DMA, I2S) beyond the original part.

Compliance and Certifications: Both parts are ROHS3 compliant, REACH unaffected, and share identical MSL ratings (3, 168 Hours), ensuring regulatory and environmental compatibility.

Parameter Comparison

Engineering Selection Recommendations

The STM32L051R6T6 is an active-status substitute for the obsolete DF36074LFZV. Both devices share identical 64-LQFP package geometry, 32KB FLASH memory capacity, and MSL ratings, enabling direct PCB footprint compatibility. The STM32L051R6T6 maintains supply voltage compatibility within the 3V to 3.6V operating window of the original part while extending the lower voltage limit to 1.65V.

The substitute provides enhanced performance characteristics: 32-bit processing versus 16-bit, 32MHz clock speed versus 16MHz, and doubled RAM capacity (8K x 8 versus 4K x 8). Extended connectivity options and additional peripherals are available on the STM32L051R6T6 but are not required for basic functional equivalence.

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity. The active product status of the STM32L051R6T6 provides long-term supply availability and manufacturing support, addressing the obsolescence of the original DF36074LFZV.

Frequently Asked Questions (FAQ)

Q: Can the STM32L051R6T6 be used as a direct replacement for the DF36074LFZV without PCB modification?

A: Yes. Both devices use the 64-LQFP (10x10) package with identical pin pitch and footprint dimensions. No PCB redesign is required for mechanical and electrical pin compatibility.

Q: Are the supply voltage requirements compatible?

A: Yes. The DF36074LFZV operates at 3V to 3.6V, and the STM32L051R6T6 operates at 1.65V to 3.6V. The substitute encompasses the original voltage range, ensuring power supply compatibility.

Q: What are the differences in memory configuration?

A: Both devices provide 32KB FLASH program memory. The STM32L051R6T6 includes 2K x 8 EEPROM and 8K x 8 RAM, compared to 4K x 8 RAM in the DF36074LFZV. The increased RAM capacity in the substitute provides additional headroom for application data storage.

Q: How do the processor architectures differ?

A: The DF36074LFZV uses a 16-bit H8/300H core at 16MHz. The STM32L051R6T6 uses a 32-bit ARM Cortex-M0+ core at 32MHz. This represents a significant architectural change requiring firmware porting and recompilation for the target platform.

Q: Are the I/O pin counts equivalent?

A: The DF36074LFZV provides 47 I/O pins, while the STM32L051R6T6 provides 51 I/O pins. The additional I/O pins in the substitute are available within the same package footprint and do not impact PCB layout compatibility.

Q: What is the operating temperature range difference?

A: The DF36074LFZV operates from -20°C to 75°C. The STM32L051R6T6 operates from -40°C to 85°C, providing an extended temperature range suitable for wider environmental applications.

Q: Are both parts RoHS compliant?

A: Yes. Both the DF36074LFZV and STM32L051R6T6 are ROHS3 compliant with identical MSL ratings of 3 (168 Hours), ensuring regulatory and environmental compatibility.

Q: What connectivity options are available on each device?

A: The DF36074LFZV provides I2C and SCI connectivity. The STM32L051R6T6 provides I2C, IrDA, SPI, and UART/USART connectivity, offering expanded communication interface options.