C161OLMHAFXUMA1 Equivalent & Substitute Parts

Part Overview

The C161OLMHAFXUMA1 is a 16-bit C166 microcontroller from Infineon Technologies, featuring ROMless architecture, 20MHz operation, and 63 I/O pins in an 80-QFP package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing system support. The transition to active alternatives ensures access to current manufacturing, improved specifications, and extended product lifecycle support.

Key Parameters

Parameter	C161OLMHAFXUMA1
Manufacturer	Infineon Technologies
Core Processor	C166
Core Size	16-Bit
Speed	20MHz
Program Memory Type	ROMless
RAM Size	2K x 8
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V
Number of I/O	63
Package / Case	80-QFP
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the C161OLMHAFXUMA1 is based on functional equivalence within Infineon's microcontroller portfolio. The substitute parts are selected from the active XMC4000 series, which provides architectural advancement while maintaining core embedded system functionality. Substitution criteria include:

Manufacturer continuity (Infineon Technologies)
Embedded microcontroller category
Surface mount technology
Connectivity support (SPI, UART/USART)
Peripheral integration (PWM, WDT, POR)
Operating temperature range compatibility (-40°C minimum)
Moisture sensitivity level (MSL 3)

The XMC4000 series represents a generational upgrade from the C166 architecture, offering 32-bit processing, higher clock speeds, expanded memory, and enhanced peripheral integration. Both substitute parts maintain the same manufacturer ecosystem and support equivalent system-level functionality.

Parameter Comparison

Parameter	C161OLMHAFXUMA1	XMC4200F64K256BAXQSA1	XMC4400F100K512BAXQMA1
Manufacturer	Infineon Technologies	Infineon Technologies	Infineon Technologies
Category	Embedded	Embedded	Embedded
Core Processor	C166	ARM® Cortex®-M4	ARM® Cortex®-M4
Core Size	16-Bit	32-Bit Single-Core	32-Bit Single-Core
Speed	20MHz	80MHz	120MHz
Program Memory Type	ROMless	FLASH	FLASH
Program Memory Size	—	256KB (256K x 8)	512KB (512K x 8)
RAM Size	2K x 8	40K x 8	80K x 8
Number of I/O	63	35	55
Voltage Supply (Vcc/Vdd)	4.5V ~ 5.5V	3.13V ~ 3.63V	3.13V ~ 3.63V
Connectivity	EBI/EMI, SPI, UART/USART	CANbus, I2C, LINbus, SPI, UART/USART, USB	CANbus, Ethernet, I2C, LINbus, SPI, UART, USB
Peripherals	POR, PWM, WDT	DMA, I2S, LED, POR, PWM, WDT	DMA, I2S, LED, POR, PWM, WDT
Operating Temperature	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	80-QFP	64-LQFP Exposed Pad	100-LQFP Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Both XMC4000 series substitutes are active products with current manufacturing support and extended lifecycle availability. Selection between XMC4200F64K256BAXQSA1 and XMC4400F100K512BAXQMA1 depends on application requirements:

XMC4200F64K256BAXQSA1 is suitable for applications requiring moderate processing capability, 256KB program memory, and 35 I/O pins in a 64-pin package. This option provides a compact footprint with reduced pin count.

XMC4400F100K512BAXQMA1 is appropriate for applications demanding higher performance (120MHz), expanded memory (512KB FLASH, 80K RAM), 55 I/O pins, and enhanced connectivity including Ethernet. The 100-pin package accommodates more peripheral integration.

Both parts comply with ROHS3 standards and maintain MSL 3 moisture sensitivity classification. The voltage supply range differs from the original part (3.13V–3.63V versus 4.5V–5.5V), requiring power supply redesign in legacy systems.

Frequently Asked Questions (FAQ)

Q: Can the XMC4200 or XMC4400 directly replace the C161OLMHAFXUMA1 without design modifications?

A: Direct pin-for-pin replacement is not possible. The C161OLMHAFXUMA1 uses an 80-QFP package with 63 I/O pins, while XMC4200 uses 64-LQFP (35 I/O) and XMC4400 uses 100-LQFP (55 I/O). PCB layout and schematic redesign is required. Additionally, the voltage supply range differs (3.13V–3.63V for XMC4000 versus 4.5V–5.5V for C161), necessitating power supply modifications.

Q: What are the key architectural differences between the C166 and XMC4000 series?

A: The C161OLMHAFXUMA1 is a 16-bit C166 architecture operating at 20MHz with ROMless design. The XMC4000 substitutes are 32-bit ARM Cortex-M4 processors with integrated FLASH memory, operating at 80MHz (XMC4200) or 120MHz (XMC4400). The XMC4000 series includes enhanced peripherals (DMA, I2S, USB) and expanded memory resources.

Q: Are there firmware compatibility considerations?

A: No direct firmware compatibility exists between C166 and ARM Cortex-M4 architectures. Application code must be rewritten or ported to the ARM Cortex-M4 instruction set. Infineon provides development tools and libraries for the XMC4000 series to facilitate migration.

Q: Which substitute part should be selected for I/O pin count requirements?

A: The C161OLMHAFXUMA1 provides 63 I/O pins. XMC4200F64K256BAXQSA1 provides 35 I/O pins, while XMC4400F100K512BAXQMA1 provides 55 I/O pins. If the application requires more than 55 I/O pins, neither substitute is suitable without external I/O expansion circuitry.

Q: What is the impact of the different operating temperature ranges?

A: The C161OLMHAFXUMA1 operates to 85°C maximum, while both XMC4000 substitutes operate to 125°C maximum. This provides extended thermal margin in the substitutes. Applications designed for the original 85°C limit will operate within specification on the XMC4000 parts.

Q: Are there compliance or certification differences?

A: Both substitute parts are ROHS3 compliant and REACH unaffected, matching the original part's compliance status. Moisture sensitivity level (MSL 3, 168 hours) is identical across all three parts.

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