DF38799FP10V Equivalent & Substitute Parts

Part Overview

The DF38799FP10V is a 16-bit H8/300H microcontroller manufactured by Renesas Electronics Corporation, featuring 128KB FLASH memory and a 10MHz core processor. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing system support, redesigns, and new production requirements. The part operates within a 2.7V to 3.6V supply range and includes integrated peripherals such as I2C, IrDA, and SCI connectivity interfaces.

Key Parameters

Parameter	DF38799FP10V
Manufacturer	Renesas Electronics Corporation
Core Processor	H8/300H
Core Size	16-Bit
Speed	10MHz
Program Memory Size	128KB (128K x 8)
Program Memory Type	FLASH
RAM Size	4K x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 3.6V
Number of I/O	75
Package / Case	100-LQFP (14x14)
Mounting Type	Surface Mount
Operating Temperature	-20°C ~ 75°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the DF38799FP10V is determined by the following critical parameters:

Package Compatibility: Both the main part and substitute must use the 100-LQFP (14x14) surface mount package to ensure PCB-level compatibility without redesign.
Program Memory Capacity: The substitute must provide a minimum of 128KB FLASH memory to maintain firmware compatibility.
I/O Pin Count: The substitute must provide sufficient I/O pins (minimum 75) to support existing circuit connections.
Supply Voltage Range: The substitute must operate within or encompass the 2.7V to 3.6V supply range.
Compliance Standards: Both parts must maintain ROHS3 compliance and equivalent moisture sensitivity ratings.

The STM32L151VBT6 qualifies as a substitute based on these parameters: it shares the identical 100-LQFP package, provides 128KB FLASH memory, includes 83 I/O pins (exceeding the requirement), operates within a 1.8V to 3.6V range (encompassing the original specification), and maintains ROHS3 compliance.

Parameter Comparison

Parameter	DF38799FP10V	STM32L151VBT6
Manufacturer	Renesas Electronics Corporation	STMicroelectronics
Core Size	16-Bit	32-Bit Single-Core
Speed	10MHz	32MHz
Program Memory Size	128KB (128K x 8)	128KB (128K x 8)
Program Memory Type	FLASH	FLASH
RAM Size	4K x 8	16K x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 3.6V	1.8V ~ 3.6V
Number of I/O	75	83
Package / Case	100-LQFP (14x14)	100-LQFP (14x14)
Mounting Type	Surface Mount	Surface Mount
Operating Temperature	-20°C ~ 75°C	-40°C ~ 85°C
Product Status	Obsolete	Not For New Designs
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

The STM32L151VBT6 serves as a functional substitute for the DF38799FP10V based on matching package geometry, FLASH memory capacity, and compliance certifications. Both devices maintain ROHS3 compliance and identical moisture sensitivity ratings, ensuring equivalent handling and storage requirements.

The STM32L151VBT6 is classified as "Not For New Designs," indicating limited long-term availability. For applications requiring extended production support, alternative parts with "Active" status should be evaluated. The substitute provides enhanced specifications including 32-bit processing capability, increased RAM capacity (16K x 8 versus 4K x 8), and extended operating temperature range (-40°C to 85°C versus -20°C to 75°C), which may benefit system performance and environmental tolerance without requiring PCB modifications.

Frequently Asked Questions (FAQ)

Q: Can the STM32L151VBT6 directly replace the DF38799FP10V without PCB redesign?

A: Yes, both devices use the 100-LQFP (14x14) package with identical pin spacing and footprint. PCB-level compatibility is maintained. However, firmware porting is required due to architectural differences between the H8/300H and ARM Cortex-M3 processors.

Q: What are the key differences in memory configuration?

A: Both parts provide 128KB FLASH memory. The STM32L151VBT6 includes 16K x 8 RAM and 4K x 8 EEPROM, compared to the DF38799FP10V's 4K x 8 RAM and no EEPROM. The increased RAM capacity in the substitute may reduce design constraints for buffer allocation and stack management.

Q: Is the supply voltage range compatible?

A: The DF38799FP10V operates at 2.7V to 3.6V. The STM32L151VBT6 operates at 1.8V to 3.6V, providing a wider lower voltage margin. Existing 3.3V supply designs are fully compatible with the substitute.

Q: What is the impact of the speed difference?

A: The DF38799FP10V operates at 10MHz, while the STM32L151VBT6 operates at 32MHz. The substitute provides higher processing speed, which may reduce execution time but requires firmware validation to ensure timing-critical operations remain within specification.

Q: Are both parts suitable for new designs?

A: The DF38799FP10V is obsolete and unsuitable for new designs. The STM32L151VBT6 is classified as "Not For New Designs," indicating limited future availability. For new production, parts with "Active" product status should be prioritized.

Q: How do the I/O pin counts compare?

A: The DF38799FP10V provides 75 I/O pins, while the STM32L151VBT6 provides 83 I/O pins. The additional pins in the substitute offer expanded connectivity options without requiring package changes.

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