AT90PWM3B-16SUR Equivalent & Substitute Parts

Part Overview

The AT90PWM3B-16SUR is an 8-bit AVR microcontroller from Microchip Technology's AVR® 90PWM Lighting series, designed for embedded lighting control applications. This device features 8KB of FLASH program memory, 512 bytes of EEPROM, and integrated PWM peripherals. The part is currently listed as obsolete, making identification of compatible substitutes essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Microchip Technology
Core Processor	AVR
Core Size	8-Bit
Speed	16MHz
Program Memory Size	8KB (8K x 8)
Program Memory Type	FLASH
EEPROM Size	512 x 8
RAM Size	512 x 8
Voltage Supply (Vcc/Vdd)	2.7V ~ 5.5V
Number of I/O	27
Data Converters	A/D 11x10b; D/A 1x10b
Connectivity	SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 105°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the AT90PWM3B-16SUR is determined by strict equivalence across the following critical parameters:

Core processor architecture (AVR)
Core size (8-Bit)
Operating frequency (16MHz)
Program memory capacity and type (8KB FLASH)
EEPROM and RAM sizes (512 x 8 each)
Supply voltage range (2.7V ~ 5.5V)
I/O count (27 pins)
Data converter specifications (A/D 11x10b; D/A 1x10b)
Connectivity interfaces (SPI, UART/USART)
Peripheral feature set (Brown-out Detect/Reset, POR, PWM, WDT)
Operating temperature range (-40°C ~ 105°C)
Compliance certifications (ROHS3, REACH Unaffected)

The AT90PWM3B-16MUR qualifies as a direct substitute based on identical electrical and functional specifications. The primary difference is packaging format: the main part uses 32-SOIC, while the substitute uses 32-QFN (7x7). Both packages maintain the same pin count, signal assignments, and electrical performance characteristics.

Parameter Comparison

Parameter	AT90PWM3B-16SUR (Main)	AT90PWM3B-16MUR (Substitute)
Manufacturer	Microchip Technology	Microchip Technology
Base Product Number	AT90PWM3B	AT90PWM3B
Series	AVR® 90PWM Lighting	AVR® 90PWM Lighting
Core Processor	AVR	AVR
Core Size	8-Bit	8-Bit
Speed	16MHz	16MHz
Program Memory Size	8KB (8K x 8)	8KB (8K x 8)
Program Memory Type	FLASH	FLASH
EEPROM Size	512 x 8	512 x 8
RAM Size	512 x 8	512 x 8
Voltage - Supply (Vcc/Vdd)	2.7V ~ 5.5V	2.7V ~ 5.5V
Number of I/O	27	27
Data Converters	A/D 11x10b; D/A 1x10b	A/D 11x10b; D/A 1x10b
Connectivity	SPI, UART/USART	SPI, UART/USART
Peripherals	Brown-out Detect/Reset, POR, PWM, WDT	Brown-out Detect/Reset, POR, PWM, WDT
Operating Temperature	-40°C ~ 105°C (TA)	-40°C ~ 105°C (TA)
Mounting Type	Surface Mount	Surface Mount
Supplier Device Package	32-SOIC	32-QFN (7x7)
Package / Case	32-SOIC (0.295", 7.50mm Width)	32-VQFN Exposed Pad
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

The AT90PWM3B-16MUR is the direct functional equivalent of the AT90PWM3B-16SUR. Both devices are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The substitute part maintains active product status with Microchip Technology, ensuring long-term availability and supply chain stability compared to the obsolete main part.

Selection between these parts depends solely on PCB layout and packaging constraints. The 32-SOIC package accommodates through-hole or surface-mount assembly with larger pitch spacing, while the 32-QFN (7x7) package provides a smaller footprint suitable for space-constrained designs. Pin assignments and electrical performance are identical across both packages.

Frequently Asked Questions (FAQ)

Q: Are the AT90PWM3B-16SUR and AT90PWM3B-16MUR electrically identical?

A: Yes. Both parts share identical core processor architecture, clock speed, memory configuration, I/O count, data converter specifications, and peripheral feature sets. Electrical performance and firmware compatibility are equivalent.

Q: What is the primary difference between these two parts?

A: The packaging format differs. The AT90PWM3B-16SUR uses a 32-SOIC package, while the AT90PWM3B-16MUR uses a 32-QFN (7x7) package. Both are surface-mount packages with 27 I/O pins and identical pin assignments.

Q: Can I use the AT90PWM3B-16MUR as a direct replacement on an existing PCB designed for the AT90PWM3B-16SUR?

A: No. PCB layout modifications are required due to different package footprints. The 32-SOIC and 32-QFN packages have different land patterns, pad spacing, and mounting requirements. A new PCB design or rework is necessary.

Q: Why is the AT90PWM3B-16SUR listed as obsolete?

A: Product status reflects Microchip Technology's lifecycle management. The AT90PWM3B-16MUR remains in active production, making it the recommended choice for new designs and ongoing production support.

Q: Are both parts compliant with current environmental standards?

A: Yes. Both the AT90PWM3B-16SUR and AT90PWM3B-16MUR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the moisture sensitivity level for these parts?

A: Both parts have an MSL rating of 3, indicating a maximum floor life of 168 hours at 60% relative humidity and 30°C before baking is required.

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