AD7870AQ Equivalent & Substitute Parts

Part Overview

The AD7870AQ is a 12-bit Analog to Digital Converter (ADC) with SAR architecture, single-ended input, and dual supply operation (±5V). Manufactured by Analog Devices Inc., this component is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and production continuity. The AD7870AQ operates at 100k samples per second with parallel and SPI data interfaces, housed in a 24-CDIP through-hole package.

Key Parameters

Parameter	Value
Resolution	12 Bits
Sampling Rate	100k Samples/Second
Number of Inputs	1
Input Type	Single Ended
Architecture	SAR (Successive Approximation Register)
Data Interface	SPI, Parallel
Configuration	S/H-ADC (1:1 Ratio)
Reference Type	Internal
Analog Supply Voltage	±5V
Digital Supply Voltage	±5V
Operating Temperature Range	-40°C to 85°C
Package Type	24-CDIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution eligibility for the AD7870AQ is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters must match identically for a part to serve as a direct substitute:

Resolution: 12 bits
Sampling Rate: 100k samples per second
Number of Inputs: 1 (single-ended)
Architecture: SAR
Data Interface: SPI and Parallel
Configuration: S/H-ADC with 1:1 ratio
Reference Type: Internal
Supply Voltages: ±5V (both analog and digital)
Operating Temperature: -40°C to 85°C
Package: 24-CDIP through-hole

All identified substitute parts meet these criteria. The primary distinction between substitutes lies in product status (active vs. obsolete) and compliance certifications (RoHS3, REACH).

Parameter Comparison

Part Number	Manufacturer	Resolution (Bits)	Sampling Rate (kS/s)	Inputs	Input Type	Architecture	Data Interface	Supply (Analog/Digital)	Temp Range (°C)	Package	Product Status	RoHS3	REACH
AD7870AQ	Analog Devices Inc.	12	100	1	Single Ended	SAR	SPI, Parallel	±5V / ±5V	-40 to 85	24-CDIP	Obsolete	—	—
AD7870BQ	Analog Devices Inc.	12	100	1	Single Ended	SAR	SPI, Parallel	±5V / ±5V	-40 to 85	24-CDIP	Active	Compliant	Unaffected
AD7870CQ	Analog Devices Inc.	12	100	1	Single Ended	SAR	SPI, Parallel	±5V / ±5V	-40 to 85	24-CDIP	Active	Compliant	Unaffected
AD7875BQ	Analog Devices Inc.	12	100	1	Single Ended	SAR	SPI, Parallel	±5V / ±5V	-40 to 85	24-CDIP	Active	Compliant	Unaffected
AD7875CQ	Analog Devices Inc.	12	100	1	Single Ended	SAR	SPI, Parallel	±5V / ±5V	-40 to 85	24-CDIP	Active	Compliant	Unaffected

Engineering Selection Recommendations

For applications currently using the obsolete AD7870AQ, the following active alternatives are available:

AD7870BQ — Direct successor within the AD7870 base product family. Maintains identical electrical specifications and package configuration. Carries RoHS3 compliance and REACH unaffected status. Inventory: 672 units.

AD7870CQ — Parametric equivalent with identical electrical and mechanical specifications. RoHS3 compliant and REACH unaffected. Higher inventory availability (1,240 units) supports production continuity.

AD7875BQ — Parametric equivalent from the AD7875 base product family. Meets all electrical and package requirements. RoHS3 compliant and REACH unaffected. Highest inventory availability (2,200 units) provides supply security.

AD7875CQ — Parametric equivalent from the AD7875 base product family. Identical electrical specifications and 24-CDIP package. RoHS3 compliant and REACH unaffected. Largest inventory stock (36,100 units) ensures sustained availability.

All substitute parts are active products with current compliance certifications, eliminating obsolescence risk associated with the original AD7870AQ.

Frequently Asked Questions (FAQ)

Q: Can AD7870BQ, AD7870CQ, AD7875BQ, and AD7875CQ be used interchangeably with AD7870AQ?

A: Yes. All substitute parts are parametric equivalents meeting identical electrical specifications: 12-bit resolution, 100k sampling rate, single-ended input, SAR architecture, ±5V dual supply, and -40°C to 85°C operating range. All are housed in 24-CDIP through-hole packages with SPI and parallel data interfaces.

Q: What is the primary reason to transition from AD7870AQ to an active substitute?

A: The AD7870AQ is classified as obsolete. Active substitutes (AD7870BQ, AD7870CQ, AD7875BQ, AD7875CQ) ensure long-term supply availability, current manufacturing support, and compliance with modern regulatory standards (RoHS3, REACH).

Q: Are there differences between the AD7870 and AD7875 base product families?

A: Within the specified parameter set, AD7870 and AD7875 variants are electrically and mechanically equivalent. Selection between families may be based on inventory availability and supply chain considerations.

Q: Do all substitutes carry the same compliance certifications?

A: All active substitutes (AD7870BQ, AD7870CQ, AD7875BQ, AD7875CQ) are RoHS3 compliant and REACH unaffected. The obsolete AD7870AQ carries no current compliance certifications.

Q: Is the 24-CDIP through-hole package consistent across all parts?

A: Yes. All parts, including the original AD7870AQ and all substitutes, use the 24-CDIP (0.300", 7.62mm) through-hole package. No PCB layout modifications are required for substitution.

Q: Which substitute offers the best supply security?

A: AD7875CQ provides the highest inventory availability (36,100 units), followed by AD7875BQ (2,200 units), AD7870CQ (1,240 units), and AD7870BQ (672 units).

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