DF36079LHV Equivalent & Substitute Parts

Part Overview

The DF36079LHV is a 16-bit H8/300H Tiny Microcontroller manufactured by Renesas Electronics Corporation, featuring 128KB FLASH memory and a 64-QFP package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations. 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

DF36079LHV

Renesas Electronics CorporationIn Stock: 1218DF36079LHV Datasheet

Current PartRFQ

MCF51AG128CQH

Freescale SemiconductorIn Stock: 5501MCF51AG128CQH Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DF36079LHV is determined by the following critical parameters:

Package Compatibility: Both the main part and substitute must use the 64-QFP (14x14) package to ensure mechanical and electrical pin compatibility on existing PCBs.

Memory Configuration: The 128KB FLASH program memory is a primary functional requirement. Substitute parts must provide equivalent or greater FLASH capacity to maintain firmware compatibility.

Connectivity Interfaces: I2C and SCI serial communication interfaces are essential for system integration. Substitute parts must support these protocols.

Voltage Supply Range: The 3V to 3.6V supply specification defines the power domain. Substitute parts operating within or encompassing this range are acceptable.

Peripheral Set: Core peripherals including PWM, WDT, and LVD functionality must be present in substitute parts to maintain system functionality.

I/O Count: A minimum of 47 I/O pins is required for signal routing compatibility.

The MCF51AG128CQH meets these substitution criteria through equivalent package geometry, matching FLASH capacity, compatible connectivity options, and overlapping voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The DF36079LHV is classified as obsolete, creating supply chain risk for ongoing production and field support. The MCF51AG128CQH is in active production status, ensuring long-term availability and supply continuity.

Compliance and Certifications: The DF36079LHV carries ROHS3 compliance and REACH unaffected status. Compliance certifications for the MCF51AG128CQH substitute are not provided in the available technical data and must be verified through the manufacturer's documentation prior to implementation in regulated applications.

Package and Pinout Compatibility: Both devices utilize 64-QFP (14x14) packages with equivalent footprints, enabling direct PCB layout compatibility. Pin-to-pin functional mapping must be performed during design integration to account for architectural differences between the H8/300H and Coldfire V1 processor families.

Functional Enhancement: The MCF51AG128CQH provides enhanced capabilities including 32-bit processing, higher clock frequency (50MHz vs. 16MHz), increased RAM (16K vs. 6K), expanded I/O (53 vs. 47), and superior A/D conversion (19x12b vs. 8x10b). These enhancements are backward-compatible with applications designed for the DF36079LHV.

Voltage Supply Compatibility: The MCF51AG128CQH operates across 2.7V to 5.5V, fully encompassing the DF36079LHV specification of 3V to 3.6V. Power supply design modifications are not required for voltage compatibility.

Frequently Asked Questions (FAQ)

Q: Can the MCF51AG128CQH be used as a direct pin-for-pin replacement for the DF36079LHV?

A: Both devices share the 64-QFP (14x14) package footprint and pin count, enabling physical PCB compatibility. However, functional pin mapping differs due to architectural differences between the H8/300H and Coldfire V1 processor families. Firmware porting and pin configuration validation are required.

Q: What are the key differences in memory architecture between these devices?

A: Both devices provide 128KB FLASH program memory. The MCF51AG128CQH offers increased RAM (16K x 8 vs. 6K x 8), providing additional working memory for applications requiring larger data buffers or stack space.

Q: Is the MCF51AG128CQH compatible with existing power supply designs for the DF36079LHV?

A: Yes. The MCF51AG128CQH operates within the 3V to 3.6V range specified for the DF36079LHV. Existing power supply designs require no modification for voltage compatibility. Current consumption specifications must be reviewed to ensure adequate supply capacity.

Q: What connectivity interfaces are available on the MCF51AG128CQH?

A: The MCF51AG128CQH provides I2C, SCI, and SPI interfaces. The DF36079LHV supports I2C and SCI. Applications utilizing only I2C and SCI connectivity maintain full interface compatibility. The additional SPI interface on the substitute provides expanded communication options.

Q: Are there temperature range considerations for substitution?

A: The MCF51AG128CQH operates across -40°C to 85°C, encompassing the DF36079LHV range of -20°C to 75°C. Applications operating within the original temperature specification are fully supported. Extended temperature operation is possible with the substitute within its specified range.

Q: What is the impact of the higher clock speed (50MHz vs. 16MHz) on system design?

A: The MCF51AG128CQH operates at 50MHz compared to the DF36079LHV at 16MHz. This provides enhanced processing performance and faster instruction execution. Existing firmware will execute faster on the substitute. EMI considerations and power consumption may require evaluation in noise-sensitive applications.

Q: Must compliance certifications be re-validated when substituting the MCF51AG128CQH?

A: Yes. The DF36079LHV carries ROHS3 and REACH certifications. Compliance status for the MCF51AG128CQH must be confirmed through manufacturer documentation. Regulatory requirements for your application may necessitate re-certification testing.

Q: How many additional I/O pins does the MCF51AG128CQH provide?

A: The MCF51AG128CQH provides 53 I/O pins compared to 47 on the DF36079LHV, offering 6 additional I/O lines for expanded signal routing and peripheral connectivity.