AD7391ARUZ Equivalent & Substitute Parts

Part Overview

The AD7391ARUZ is a 10-bit Digital to Analog Converter (DAC) manufactured by Analog Devices Inc., designed for data acquisition applications requiring voltage output conversion. This single-channel DAC operates across a wide supply voltage range of 2.7V to 5.5V for both analog and digital domains, making it suitable for battery-powered and standard industrial systems. The device is currently in active production status with 3,400 units available in stock. Substitute parts are identified when equivalent functional performance can be achieved within the specified electrical and mechanical parameters while accommodating different package configurations or performance characteristics.

Substiute Parts

AD7391ARUZ

Analog Devices Inc.In Stock: 3475AD7391ARUZ Datasheet

Current PartRFQ

AD5310RBRMZ

Analog Devices Inc.In Stock: 1996AD5310RBRMZ Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the AD7391ARUZ is determined by the following critical parameters:

• Resolution: 10-bit conversion capability
• Channel Count: Single D/A converter
• Output Configuration: Voltage output with buffered stage
• Interface Protocol: SPI serial communication
• Supply Voltage Compatibility: 2.7V to 5.5V dual supply operation
• Reference Input: External reference requirement
• Mounting Technology: Surface mount package
• Compliance Standards: ROHS3 and REACH compliance

The AD5310RBRMZ qualifies as a substitute part because it maintains the core functional requirements of 10-bit resolution, single-channel DAC architecture, buffered voltage output, SPI interface, and identical supply voltage ranges. Both devices are manufactured by Analog Devices Inc. and meet the same regulatory compliance standards. Differences in package configuration (8-TSSOP versus 10-MSOP), settling time performance, and reference flexibility do not preclude substitution when application requirements permit.

Parameter Comparison

Engineering Selection Recommendations

Both the AD7391ARUZ and AD5310RBRMZ are active production devices from Analog Devices Inc. with full ROHS3 compliance and unlimited moisture sensitivity ratings. Selection between these parts is based on application-specific constraints:

The AD7391ARUZ is the primary choice when the 8-TSSOP package footprint is required or when operating temperatures above 105°C are specified. The device maintains R-2R architecture with specified INL/DNL performance across the full -40°C to 125°C range.

The AD5310RBRMZ serves as a substitute when package size reduction is beneficial or when the nanoDAC® series integration is preferred. This part operates within the -40°C to 105°C temperature range and offers improved INL/DNL specifications (±0.5 LSB maximum) with faster settling time (7µs versus 70µs). The 10-MSOP package provides a smaller footprint at 0.118" width compared to the 8-TSSOP at 0.173" width.

Both devices support identical supply voltage ranges and SPI interface protocols, ensuring functional compatibility in applications where package and thermal specifications align with design requirements.

Frequently Asked Questions (FAQ)

Q: Can the AD5310RBRMZ directly replace the AD7391ARUZ in existing designs?

A: Direct replacement requires verification of three factors: (1) PCB footprint compatibility with the 10-MSOP package versus the original 8-TSSOP layout, (2) operating temperature range confirmation that the maximum 105°C specification meets application requirements, and (3) reference input configuration compatibility, as the AD5310RBRMZ supports both external and internal reference options while the AD7391ARUZ requires external reference only.

Q: What are the key differences in settling time between these parts?

A: The AD7391ARUZ specifies 70µs typical settling time, while the AD5310RBRMZ specifies 7µs. This 10-fold improvement in the substitute part may affect system timing requirements and should be evaluated against application bandwidth specifications.

Q: Are both parts suitable for the same supply voltage applications?

A: Yes. Both the AD7391ARUZ and AD5310RBRMZ operate across identical analog and digital supply voltage ranges of 2.7V to 5.5V, making them compatible for battery-powered systems, 3.3V logic interfaces, and 5V industrial applications.

Q: What is the significance of the different DAC architectures?

A: The AD7391ARUZ uses R-2R architecture while the AD5310RBRMZ uses String DAC architecture. Both architectures achieve 10-bit resolution with the specified linearity performance. Architecture selection does not affect substitution eligibility when INL/DNL specifications are met.

Q: How do the INL/DNL specifications compare?

A: The AD7391ARUZ specifies INL/DNL of ±2/±0.9 LSB maximum, while the AD5310RBRMZ specifies ±0.5/±0.5 LSB maximum. The substitute part offers superior linearity performance, which may provide additional design margin in precision measurement applications.

Q: Are both parts available in the same packaging options?

A: No. The AD7391ARUZ is supplied in 8-TSSOP packaging (0.173" width), while the AD5310RBRMZ is supplied in 10-MSOP packaging (0.118" width). PCB layout modifications are required when substituting between these package types.