AD7472AR Equivalent & Substitute Parts

Part Overview

The AD7472AR is a 12-bit Analog to Digital Converter (ADC) manufactured by Analog Devices Inc., featuring a single-ended input with SAR (Successive Approximation Register) architecture and parallel data interface. The device operates across a supply voltage range of 2.7V to 5.25V for both analog and digital domains, with a sampling rate of 1.5M samples per second and an external reference configuration. The AD7472AR is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support, redesign initiatives, and component procurement.

Key Parameters

Parameter	Value
Resolution (Bits)	12
Number of Inputs	1
Input Type	Single Ended
Sampling Rate (SPS)	1.5M
Architecture	SAR
Data Interface	Parallel
Reference Type	External
Supply Voltage (Analog)	2.7V ~ 5.25V
Supply Voltage (Digital)	2.7V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package	24-SOIC
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution of the AD7472AR is determined by strict alignment of core electrical and mechanical parameters. The following criteria define valid substitutes:

Primary Substitution Criteria:

Resolution: 12 bits (mandatory)
Architecture: SAR (mandatory)
Number of A/D Converters: 1 (mandatory)
Configuration: S/H-ADC with 1:1 ratio (mandatory)
Supply voltage compatibility: Minimum overlap within 2.7V ~ 5.25V range
Operating temperature range: Minimum -40°C lower bound
Mounting type: Surface Mount (mandatory)

Substitute Classification:

Direct Equivalent (AD7472ARZ): Identical electrical specifications and 24-SOIC package. Differs only in packaging format (Tube vs. unspecified original) and product status (Active vs. Obsolete). Provides pin-for-pin compatibility with identical performance characteristics.

Similar Substitutes (AD7091R-8BRUZ, AD7091BCPZ-RL7): Share core 12-bit SAR architecture and single A/D converter configuration but introduce variations in input count, data interface, reference type, package format, and operating temperature range. These parts require circuit-level evaluation for compatibility.

Parameter Comparison

Parameter	AD7472AR (Main)	AD7472ARZ (Direct)	AD7091R-8BRUZ (Similar)	AD7091BCPZ-RL7 (Similar)
Resolution (Bits)	12	12	12	12
Number of Inputs	1	1	8	1
Input Type	Single Ended	Single Ended	Single Ended	Single Ended
Sampling Rate (SPS)	1.5M	1.5M	1M	1M
Architecture	SAR	SAR	SAR	SAR
Data Interface	Parallel	Parallel	SPI, DSP	SPI, DSP
Reference Type	External	External	External, Internal	Supply
Supply Voltage (Analog)	2.7V ~ 5.25V	2.7V ~ 5.25V	2.09V ~ 5.25V	2.09V ~ 5.25V
Supply Voltage (Digital)	2.7V ~ 5.25V	2.7V ~ 5.25V	2.09V ~ 5.25V	2.09V ~ 5.25V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	24-SOIC	24-SOIC	24-TSSOP	8-UFDFN Exposed Pad, CSP
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AD7472ARZ: This part is the recommended direct replacement for the obsolete AD7472AR. It maintains identical electrical performance, pin configuration, and package format while offering active product status and ROHS3 compliance. No circuit modifications are required for substitution.

AD7091R-8BRUZ: This part is suitable for applications requiring expanded input capability (8 channels vs. 1 channel). The shift from parallel to SPI/DSP interface requires firmware and PCB-level modifications. The extended operating temperature range (-40°C to 125°C) provides enhanced thermal performance. Lower sampling rate (1M vs. 1.5M SPS) must be evaluated against application timing requirements. ROHS3 compliance and active status are confirmed.

AD7091BCPZ-RL7: This part offers the most compact package footprint (8-LFCSP vs. 24-SOIC) and supply-referenced architecture, reducing external component count. The transition from parallel to SPI/DSP interface and single input configuration requires significant circuit redesign. Extended operating temperature range and ROHS3 compliance are provided. This option is suitable for space-constrained applications with compatible interface requirements.

Frequently Asked Questions (FAQ)

Q: Can AD7472ARZ be used as a direct drop-in replacement for AD7472AR?

A: Yes. AD7472ARZ provides identical electrical specifications, pin configuration, and 24-SOIC package format. The only differences are packaging format (Tube) and product status (Active). No circuit modifications are required.

Q: What are the key differences between AD7472AR and AD7091R-8BRUZ?

A: The primary differences are: (1) input count increases from 1 to 8 channels, (2) data interface changes from parallel to SPI/DSP, (3) sampling rate decreases from 1.5M to 1M SPS, (4) package changes from 24-SOIC to 24-TSSOP, and (5) operating temperature range extends to 125°C. These differences require circuit and firmware modifications.

Q: Is AD7091BCPZ-RL7 compatible with existing AD7472AR PCB layouts?

A: No. AD7091BCPZ-RL7 uses an 8-LFCSP package versus the 24-SOIC package of AD7472AR, requiring complete PCB redesign. Additionally, the SPI/DSP interface replaces the parallel interface, necessitating firmware changes.

Q: What is the minimum supply voltage for each substitute part?

A: AD7472AR and AD7472ARZ require minimum 2.7V. AD7091R-8BRUZ and AD7091BCPZ-RL7 support lower minimum voltage of 2.09V, providing enhanced operation in low-power applications.

Q: Are all substitute parts RoHS compliant?

A: AD7472ARZ, AD7091R-8BRUZ, and AD7091BCPZ-RL7 are all ROHS3 compliant. RoHS status for the original AD7472AR is not specified in available documentation.

Q: Which substitute part maintains the highest sampling rate?

A: AD7472ARZ maintains the original 1.5M SPS sampling rate. AD7091R-8BRUZ and AD7091BCPZ-RL7 both operate at 1M SPS, representing a 33% reduction in sampling speed.

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