ATSAMB11G18A-MU-T Equivalent & Substitute Parts

Part Overview

The ATSAMB11G18A-MU-T is a Bluetooth v4.1 RF transceiver with integrated microcontroller (TxRx + MCU) manufactured by Microchip Technology in a 48-VFQFN exposed pad package. This component combines 2.4GHz Bluetooth connectivity with embedded processing capabilities, featuring 256kB Flash, 128kB ROM, and 128kB RAM memory. The part is currently obsolete, necessitating identification of functionally compatible alternatives for ongoing design requirements and production continuity.

Key Parameters

Parameter	ATSAMB11G18A-MU-T
Manufacturer	Microchip Technology
Product Status	Obsolete
Type	TxRx + MCU
RF Family/Standard	Bluetooth
Protocol	Bluetooth v4.1
Frequency	2.4GHz
Power Output	4.6dBm
Sensitivity	-96dBm
Memory (Flash/ROM/RAM)	256kB / 128kB / 128kB
Serial Interfaces	I2C, SPI, UART
GPIO Count	30
Voltage Supply Range	2.3V ~ 4.3V
Current - Receiving	4.2mA
Current - Transmitting	3mA
Operating Temperature	-40°C ~ 85°C
Package / Case	48-VFQFN Exposed Pad (6x6mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)

Substitute Part Grouping Explanation

Substitute parts for the ATSAMB11G18A-MU-T are grouped based on the following substitution criteria:

Group 1: 48-VFQFN Package (6x6mm) - Pin-Compatible Substitutes

IS1870SF-102 (Tape & Reel)
IS1870SF-202 (Cut Tape)

These parts maintain the same 48-pin VFQFN package footprint and exposed pad configuration, enabling direct PCB layout compatibility. Both operate within overlapping voltage supply ranges and support the same serial interface protocols (I2C, SPI, UART).

Group 2: 32-VFQFN Package (4x4mm) - Functional Alternatives

IS1871SF-102 (Tape & Reel)
IS1871SF-202 (Cut Tape)

These parts provide equivalent Bluetooth v5.0 functionality in a smaller 32-pin VFQFN package. PCB redesign is required due to different pin count and package dimensions. GPIO count is reduced to 15 pins.

Key Substitution Parameters:

Bluetooth protocol version (v4.1 vs v5.0)
Frequency band (2.4GHz vs 2.402GHz ~ 2.48GHz)
Package type and pin count (48-pin vs 32-pin)
Memory configuration (256kB Flash maintained across all substitutes)
Voltage supply compatibility (2.3V ~ 4.3V vs 1.9V ~ 3.6V)
Operating temperature range (-40°C ~ 85°C vs -20°C ~ 70°C)
Serial interface support (I2C, SPI, UART present in all)

Parameter Comparison

Parameter	ATSAMB11G18A-MU-T	IS1870SF-102	IS1870SF-202	IS1871SF-102	IS1871SF-202
Manufacturer	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active	Active	Active
Type	TxRx + MCU	TxRx + MCU	TxRx + MCU	TxRx + MCU	TxRx + MCU
Protocol	Bluetooth v4.1	Bluetooth v5.0	Bluetooth v5.0	Bluetooth v5.0	Bluetooth v5.0
Frequency	2.4GHz	2.402GHz ~ 2.48GHz	2.402GHz ~ 2.48GHz	2.402GHz ~ 2.48GHz	2.402GHz ~ 2.48GHz
Power Output	4.6dBm	0dBm	0dBm	0dBm	0dBm
Sensitivity	-96dBm	-90dBm	-90dBm	-90dBm	-90dBm
Memory (Flash/ROM/SRAM)	256kB / 128kB / 128kB	256kB / 32kB / 24kB	256kB / 32kB / 24kB	256kB / 32kB / 24kB	256kB / 32kB / 24kB
Serial Interfaces	I2C, SPI, UART	ADC, I2C, PWM, SPI, UART	ADC, I2C, PWM, SPI, UART	ADC, I2C, PWM, SPI, UART	ADC, I2C, PWM, SPI, UART
GPIO Count	30	31	31	15	15
Voltage Supply Range	2.3V ~ 4.3V	1.9V ~ 3.6V	1.9V ~ 3.6V	1.9V ~ 3.6V	1.9V ~ 3.6V
Current - Receiving	4.2mA	13mA	10mA	13mA	10mA
Current - Transmitting	3mA	13mA	10mA	13mA	10mA
Operating Temperature	-40°C ~ 85°C	-20°C ~ 70°C	-40°C ~ 85°C	-20°C ~ 70°C	-40°C ~ 85°C
Package / Case	48-VFQFN Exposed Pad	48-VFQFN Exposed Pad	48-VFQFN Exposed Pad	32-VFQFN Exposed Pad	32-VFQFN Exposed Pad
Supplier Device Package	48-QFN (6x6)	48-QFN (6x6)	48-QFN (6x6)	32-QFN (4x4)	32-QFN (4x4)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

For Direct PCB Replacement (No Layout Changes):

Select IS1870SF-102 or IS1870SF-202 for applications requiring the 48-VFQFN package footprint. Both maintain pin-compatible layouts with the ATSAMB11G18A-MU-T. IS1870SF-202 supports the full operating temperature range (-40°C ~ 85°C) matching the original part, while IS1870SF-102 operates within -20°C ~ 70°C. Both are active products with ROHS3 compliance and REACH unaffected status.

For Space-Constrained Designs:

Select IS1871SF-102 or IS1871SF-202 when the smaller 32-VFQFN (4x4mm) package is acceptable. IS1871SF-202 provides full temperature range coverage (-40°C ~ 85°C). PCB redesign is required due to reduced GPIO count (15 vs 30 pins) and different pin configuration.

Temperature Range Considerations:

IS1870SF-202 and IS1871SF-202 maintain the original -40°C ~ 85°C operating range. IS1870SF-102 and IS1871SF-102 operate within -20°C ~ 70°C and are suitable only for applications not requiring extended low-temperature operation.

Power Consumption Trade-offs:

All substitute parts exhibit higher current consumption during receive and transmit operations compared to the ATSAMB11G18A-MU-T. IS1870SF-202 and IS1871SF-202 provide optimized current profiles (10mA receive/transmit) versus IS1870SF-102 and IS1871SF-102 (13mA receive/transmit).

Protocol Upgrade Path:

All substitutes implement Bluetooth v5.0, providing enhanced range and data rate (921.6kbps) compared to Bluetooth v4.1. Firmware compatibility assessment is required for applications dependent on v4.1-specific features.

Frequently Asked Questions (FAQ)

Q: Can IS1870SF-102 or IS1870SF-202 be used as direct replacements without PCB modification?

A: Yes. Both parts maintain the 48-VFQFN exposed pad package with identical footprint dimensions (6x6mm). Pin assignments are compatible, enabling direct PCB replacement. Firmware validation is required to confirm Bluetooth v5.0 compatibility with existing application code.

Q: What is the primary difference between IS1870SF-102 and IS1870SF-202?

A: Both parts are functionally identical in the 48-VFQFN package. The primary differences are packaging format (Tape & Reel vs Cut Tape) and operating temperature range. IS1870SF-202 supports -40°C ~ 85°C; IS1870SF-102 supports -20°C ~ 70°C. IS1870SF-202 also provides optimized current consumption (10mA vs 13mA).

Q: Why do IS1871SF parts have fewer GPIO pins?

A: IS1871SF parts use a 32-pin VFQFN package (4x4mm) compared to the 48-pin VFQFN package (6x6mm) of IS1870SF parts. The reduced package size results in 15 GPIO pins versus 31 pins. Applications requiring all 30 GPIO pins of the original ATSAMB11G18A-MU-T must use IS1870SF variants.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts (IS1870SF-102, IS1870SF-202, IS1871SF-102, IS1871SF-202) are ROHS3 compliant with MSL 3 (168 Hours) moisture sensitivity rating, matching the original part specifications.

Q: What is the impact of Bluetooth v5.0 upgrade on existing firmware?

A: Bluetooth v5.0 is backward compatible with v4.1 for basic connectivity. However, firmware validation is required to confirm compatibility with application-specific features, stack implementations, and proprietary extensions used in the original design.

Q: How do voltage supply ranges differ between the original and substitute parts?

A: The ATSAMB11G18A-MU-T operates at 2.3V ~ 4.3V. All substitute parts operate at 1.9V ~ 3.6V. Applications operating above 3.6V require voltage regulation or redesign to accommodate the lower maximum supply voltage of substitute parts.

Q: Which substitute part provides the best power efficiency?

A: IS1870SF-202 and IS1871SF-202 provide optimized current consumption at 10mA for both receive and transmit operations, compared to 13mA for IS1870SF-102 and IS1871SF-102 variants. Selection depends on package requirements (48-pin vs 32-pin) and temperature range needs.

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