DF36109HV Equivalent & Substitute Parts

Part Overview

The DF36109HV is a 16-bit H8/300H Tiny Microcontroller manufactured by Renesas Electronics Corporation, featuring 128KB FLASH memory and operating at 20MHz. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, redesigns, and new production requirements. The part is housed in a 100-LFQFP package and operates across a 3V to 5.5V supply range with integrated peripherals including I2C, SCI, PWM, and WDT functionality.

Substiute Parts

DF36109HV

Renesas Electronics CorporationIn Stock: 1034DF36109HV Datasheet

Current PartRFQ

AT32UC3C1128C-AUT

Microchip TechnologyIn Stock: 2294AT32UC3C1128C-AUT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DF36109HV is based on the following critical parameters that must align or exceed the original specification:

Memory Configuration: Program memory must be minimum 128KB FLASH to maintain firmware compatibility.

Package Compatibility: The 100-pin LFQFP/TQFP package footprint (14x14mm) is the primary mechanical constraint for direct PCB substitution.

Voltage Supply Range: Operating voltage must encompass the 3V to 5.5V range to ensure compatibility with existing power delivery systems.

I/O Count: Minimum 79 I/O pins required to maintain signal routing and peripheral connectivity.

Connectivity & Peripherals: I2C, SCI, PWM, and WDT functionality must be present to support existing firmware and hardware interfaces.

Compliance Standards: RoHS3 compliance and MSL rating of 3 are mandatory for manufacturing and supply chain requirements.

The AT32UC3C1128C-AUT qualifies as a substitute based on these parameters, despite architectural differences (32-bit vs. 16-bit core), because it meets or exceeds all critical electrical, mechanical, and compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

The AT32UC3C1128C-AUT is a qualified substitute for the obsolete DF36109HV based on the following engineering criteria:

Compliance Alignment: Both parts maintain ROHS3 compliance and identical MSL ratings, ensuring compatibility with current manufacturing and supply chain standards.

Active Production Status: The AT32UC3C1128C-AUT is in active production with confirmed inventory availability (2212 units), whereas the DF36109HV is obsolete with limited stock (942 units). This makes the substitute the preferred choice for new designs and long-term production support.

Electrical Compatibility: Identical supply voltage range (3V to 5.5V) and package footprint (100-pin, 14x14mm) enable direct PCB substitution without redesign of power delivery or signal routing layers.

Performance Enhancement: The substitute provides superior specifications across multiple dimensions—32-bit architecture, 66MHz operation, 32KB RAM, and extended connectivity options—without introducing incompatibility with the original 128KB FLASH memory requirement.

Functional Superset: All required peripherals (PWM, WDT, I2C) are present in the substitute, with additional capabilities (DMA, I2S, USB, Ethernet) available for future feature expansion without hardware modification.

Frequently Asked Questions (FAQ)

Q: Can the AT32UC3C1128C-AUT directly replace the DF36109HV on existing PCBs?

A: Yes, the 100-pin TQFP footprint (14x14mm) is mechanically and electrically compatible with the 100-pin LQFP footprint. Pin assignments must be verified against both datasheets to ensure signal routing compatibility, as core architecture differences may result in different peripheral pin assignments.

Q: What are the primary differences between these two microcontrollers?

A: The DF36109HV is a 16-bit H8/300H architecture operating at 20MHz with 5KB RAM, while the AT32UC3C1128C-AUT is a 32-bit AVR architecture operating at 66MHz with 32KB RAM. Both share 128KB FLASH memory and 3V to 5.5V supply compatibility. The substitute offers higher performance and expanded connectivity (USB, Ethernet, CANbus) but requires firmware porting due to architectural differences.

Q: Is firmware compatibility guaranteed between these parts?

A: No. Firmware written for the H8/300H architecture cannot execute directly on the AVR32 architecture. Complete firmware porting and recompilation are required. However, the functional requirements (I2C, PWM, WDT) are available on both platforms.

Q: What is the impact of the wider operating temperature range on the substitute?

A: The AT32UC3C1128C-AUT operates from -40°C to 85°C, compared to the DF36109HV range of -20°C to 75°C. This provides additional margin for applications requiring extended temperature operation, with no negative impact on systems designed for the original temperature range.

Q: Are there any compliance or certification concerns with substitution?

A: Both parts are ROHS3 compliant with identical MSL ratings (3, 168 hours). No additional compliance barriers exist for substitution. However, any system-level certifications (medical, automotive, industrial) must be re-evaluated based on the substitute part's specific qualification status.

Q: What inventory considerations should be evaluated?

A: The DF36109HV has 942 units available (obsolete status), while the AT32UC3C1128C-AUT has 2212 units in active production. For long-term production support, the substitute ensures supply chain continuity and eliminates obsolescence risk.