DF36074LFZWV Equivalent & Substitute Parts

Part Overview

The DF36074LFZWV 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, WDT, and an 8-channel 10-bit A/D converter.

Substiute Parts

DF36074LFZWV

Renesas Electronics CorporationIn Stock: 978DF36074LFZWV Datasheet

Current PartRFQ

STM32L051R6T6

STMicroelectronicsIn Stock: 836304STM32L051R6T6 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DF36074LFZWV 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 layout modifications.

Memory Configuration: The substitute must provide a minimum of 32KB FLASH program memory to maintain firmware capacity equivalence.

Voltage Supply Range: The substitute must operate within or encompass the 3V to 3.6V supply range of the original part.

Operating Temperature Range: The substitute must support the -40°C to 85°C operating temperature specification.

I/O Count: The substitute must provide sufficient I/O pins (minimum 47) to support existing circuit connections.

Connectivity and Peripherals: The substitute must include I2C and SCI/UART connectivity, along with core peripherals including PWM, WDT, and analog-to-digital conversion capability.

The STM32L051R6T6 meets these substitution criteria through equivalent package geometry, matching memory capacity, compatible voltage operation, and provision of required connectivity and peripheral functions.

Parameter Comparison

Engineering Selection Recommendations

The STM32L051R6T6 is a direct substitute for the obsolete DF36074LFZWV based on the following engineering criteria:

Package Equivalence: Both devices utilize the 64-LQFP (10x10) package, eliminating the need for PCB redesign or layout modifications.

Memory Capacity: Both parts provide 32KB FLASH program memory, ensuring firmware compatibility without code size constraints.

Voltage Compatibility: The STM32L051R6T6 operates across a wider voltage range (1.65V to 3.6V) that fully encompasses the original part's 3V to 3.6V specification, providing enhanced flexibility for power supply design.

Temperature Rating: Both devices maintain the -40°C to 85°C operating temperature range, ensuring thermal compatibility in existing applications.

Compliance Status: Both parts are ROHS3 compliant and carry identical MSL ratings (3, 168 Hours), maintaining regulatory and manufacturing process compatibility.

Active Product Status: The STM32L051R6T6 is classified as active, ensuring long-term availability, ongoing manufacturer support, and continued supply chain access compared to the obsolete DF36074LFZWV.

Frequently Asked Questions (FAQ)

Q: Can the STM32L051R6T6 be used as a direct replacement without PCB modifications?

A: Yes. Both devices use the 64-LQFP (10x10) package with identical pin counts and footprints. No PCB layout changes are required for package compatibility.

Q: What are the key differences between these microcontrollers?

A: The STM32L051R6T6 features a 32-bit ARM Cortex-M0+ core operating at 32MHz, compared to the 16-bit H8/300H core at 16MHz in the DF36074LFZWV. The substitute provides 8KB additional RAM, 2KB EEPROM, enhanced A/D conversion (16x12b vs. 8x10b), and additional connectivity options including SPI, IrDA, and I2S. Both maintain 32KB FLASH memory and identical operating temperature ranges.

Q: Are the voltage supply requirements compatible?

A: Yes. The STM32L051R6T6 operates from 1.65V to 3.6V, which fully encompasses the DF36074LFZWV's 3V to 3.6V range. Existing power supply designs for the original part will function with the substitute.

Q: Will firmware require modification for the substitute part?

A: Firmware migration from the H8/300H architecture to the ARM Cortex-M0+ architecture requires code porting and recompilation. The instruction sets and development environments differ between these processor families.

Q: Are both parts RoHS compliant?

A: Yes. Both the DF36074LFZWV and STM32L051R6T6 are ROHS3 compliant with identical MSL ratings of 3 (168 Hours), maintaining regulatory and manufacturing process compatibility.

Q: What is the I/O pin count difference?

A: The STM32L051R6T6 provides 51 I/O pins compared to 47 on the DF36074LFZWV. This additional I/O capacity does not create compatibility issues; unused pins can remain unconnected in the application circuit.