AD7451BRMZ Equivalent & Substitute Parts

Part Overview

The AD7451BRMZ is a 12-bit Analog to Digital Converter manufactured by Analog Devices Inc., designed for single-channel data acquisition applications. It features a Successive Approximation Register (SAR) architecture with a 1 MHz sampling rate, pseudo-differential input configuration, and operates across a wide supply voltage range of 2.7V to 5.25V. The device is packaged in an 8-MSOP surface mount package and maintains Active product status with 3,644 units currently in stock.

Equivalent and substitute parts become necessary when the primary part experiences supply constraints, end-of-life transitions, or when design flexibility permits selection from functionally compatible alternatives that meet the same electrical and mechanical requirements.

Key Parameters

Parameter	Value
Number of Bits	12
Sampling Rate (Per Second)	1M
Number of Inputs	1
Input Type	Pseudo-Differential
Data Interface	SPI, DSP
Architecture	SAR
Reference Type	External
Voltage - Supply, Analog	2.7V ~ 5.25V
Voltage - Supply, Digital	2.7V ~ 5.25V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-MSOP (0.118", 3.00mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the AD7451BRMZ is determined by strict alignment with the following critical parameters:

12-bit resolution
1 MHz sampling rate capability
Single input channel
Pseudo-differential input configuration
SPI data interface compatibility
SAR architecture
External reference type
Supply voltage range: 2.7V to 5.25V (both analog and digital)
Operating temperature range: -40°C to 85°C
8-pin surface mount package (8-MSOP or equivalent footprint)

Substitute parts are grouped into two categories:

Parametric Equivalent: AD7451ARMZ is a direct parametric match from Analog Devices Inc., sharing identical electrical specifications and package configuration.

Similar Alternatives: ADS7822IDGKRQ1, ADS7834E/2K5, and MCP3201-CI/MS are functionally similar 12-bit SAR ADCs with single inputs and SPI interfaces. These parts maintain compatibility with the core application requirements but may exhibit variations in sampling rate, input configuration, or supply voltage specifications that require design verification.

Parameter Comparison

Parameter	AD7451BRMZ	AD7451ARMZ	ADS7822IDGKRQ1	ADS7834E/2K5	MCP3201-CI/MS
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	Texas Instruments	Texas Instruments	Microchip Technology
Number of Bits	12	12	12	12	12
Sampling Rate (Per Second)	1M	1M	200k	500k	100k
Number of Inputs	1	1	1	1	1
Input Type	Pseudo-Differential	Pseudo-Differential	Pseudo-Differential	Differential	Pseudo-Differential
Data Interface	SPI, DSP	SPI, DSP	SPI	SPI	SPI
Architecture	SAR	SAR	SAR	SAR	SAR
Reference Type	External	External	External	External, Internal	External
Voltage - Supply, Analog	2.7V ~ 5.25V	2.7V ~ 5.25V	2.7V ~ 3.6V, 5V	5V	2.7V ~ 5.5V
Voltage - Supply, Digital	2.7V ~ 5.25V	2.7V ~ 5.25V	2.7V ~ 3.6V, 5V	5V	2.7V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	8-MSOP	8-MSOP	8-VSSOP	8-VSSOP	8-MSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Active	Active	Active	Last Time Buy	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

AD7451ARMZ is the recommended parametric equivalent. It maintains identical electrical specifications, package configuration, and operating characteristics as the AD7451BRMZ. Both devices are manufactured by Analog Devices Inc., carry Active product status, and are ROHS3 compliant. Selection between AD7451BRMZ and AD7451ARMZ depends solely on inventory availability and packaging preference (Tube vs. alternative formats).

ADS7822IDGKRQ1 (Texas Instruments) is suitable for applications where the 200 kHz sampling rate meets system requirements. This device carries Automotive grade qualification and AEC-Q100 certification, making it appropriate for automotive and harsh environment applications. Supply voltage compatibility is limited to 2.7V–3.6V or 5V discrete levels, requiring design verification against the continuous 2.7V–5.25V range of the primary part.

MCP3201-CI/MS (Microchip Technology) accommodates the widest supply voltage range (2.7V–5.5V) and maintains pseudo-differential input configuration. The 100 kHz sampling rate is the lowest among alternatives and is suitable only for low-bandwidth signal acquisition. Active product status and ROHS3 compliance support long-term availability.

ADS7834E/2K5 (Texas Instruments) carries Last Time Buy status and should be avoided for new designs. The device operates exclusively at 5V supply and features differential (rather than pseudo-differential) input configuration, introducing design incompatibilities.

Frequently Asked Questions (FAQ)

Q: Can AD7451ARMZ be used as a direct replacement for AD7451BRMZ?

A: Yes. AD7451ARMZ is a parametric equivalent with identical electrical specifications, resolution, sampling rate, input configuration, supply voltage range, and package type. Substitution requires no circuit modifications.

Q: What is the primary difference between the AD7451BRMZ and ADS7822IDGKRQ1?

A: The primary difference is sampling rate: AD7451BRMZ operates at 1 MHz, while ADS7822IDGKRQ1 operates at 200 kHz. Additionally, ADS7822IDGKRQ1 carries automotive qualification (AEC-Q100) and supports discrete supply voltages (2.7V–3.6V or 5V) rather than continuous ranges. Supply voltage compatibility must be verified for your application.

Q: Is MCP3201-CI/MS compatible with designs requiring 1 MHz sampling?

A: No. MCP3201-CI/MS operates at a maximum sampling rate of 100 kHz, making it unsuitable for applications requiring 1 MHz conversion rates. This part is appropriate only for low-bandwidth signal acquisition.

Q: Can ADS7834E/2K5 replace the AD7451BRMZ?

A: ADS7834E/2K5 is not recommended for new designs. It carries Last Time Buy status, operates exclusively at 5V (incompatible with the 2.7V–5.25V range), and features differential input configuration rather than pseudo-differential. These differences introduce design incompatibilities.

Q: Are all substitute parts available in the same 8-pin package?

A: No. AD7451BRMZ and MCP3201-CI/MS use 8-MSOP packages. ADS7822IDGKRQ1 and ADS7834E/2K5 use 8-VSSOP packages. While both are 8-pin surface mount packages with similar footprints, PCB layout verification is required before substitution.

Q: Do all substitute parts support both SPI and DSP interfaces?

A: No. AD7451BRMZ and AD7451ARMZ support both SPI and DSP interfaces. ADS7822IDGKRQ1, ADS7834E/2K5, and MCP3201-CI/MS support SPI interface only. Design verification is required if DSP interface functionality is required.

Q: What compliance certifications apply to these parts?

A: All parts are ROHS3 compliant and REACH unaffected. ADS7822IDGKRQ1 carries additional Automotive grade qualification and AEC-Q100 certification, suitable for automotive applications. All parts are classified under ECCN EAR99 and HTSUS 8542.39.0001.

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