AD7643BCPZ Equivalent & Substitute Parts

Part Overview

The AD7643BCPZ is an 18-bit Analog to Digital Converter manufactured by Analog Devices Inc., part of the PulSAR® series. This data acquisition component features a single differential input with SAR (Successive Approximation Register) architecture and operates at a sampling rate of 1.25M samples per second. The device is actively produced and widely used in precision measurement and signal conditioning applications requiring high-resolution analog conversion with multiple interface options (SPI, Parallel, DSP).

Substitute parts are identified when equivalent electrical performance, compatible packaging footprints, and matching operational specifications can support direct replacement in circuit designs, reducing supply chain dependencies while maintaining system performance requirements.

Substiute Parts

AD7643BCPZ

Analog Devices Inc.In Stock: 1980AD7643BCPZ Datasheet

Current PartRFQ

AD7986BCPZ

Analog Devices Inc.In Stock: 1418AD7986BCPZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AD7643BCPZ is determined by the following critical parameters:

• Resolution: 18-bit conversion capability
• Architecture: SAR-based analog to digital conversion
• Input Configuration: Single differential input channel
• Sampling Performance: Minimum 1.25M samples per second
• Supply Voltage Compatibility: Analog and digital supply ranges within 2.37V ~ 2.63V
• Interface Support: SPI and DSP protocols (minimum required)
• Temperature Range: -40°C ~ 85°C operation
• Compliance: ROHS3 and REACH compliance maintained
• Packaging: Surface mount CSP format with exposed pad

The AD7986BCPZ qualifies as a substitute based on matching 18-bit resolution, SAR architecture, differential input, compatible supply voltages, overlapping temperature range, and equivalent compliance certifications. Differences in sampling rate (2M vs. 1.25M), package footprint (20-LFCSP vs. 48-LFCSP), and interface options (SPI, DSP vs. SPI, Parallel, DSP) require circuit-level evaluation for specific applications.

Parameter Comparison

Engineering Selection Recommendations

Both the AD7643BCPZ and AD7986BCPZ maintain active product status with equivalent compliance certifications (ROHS3 Compliant, REACH Unaffected). Selection between these components depends on application-specific requirements:

The AD7643BCPZ provides a 48-pin package with parallel interface support, suitable for applications requiring maximum interface flexibility and pin count availability. The AD7986BCPZ offers a more compact 20-pin package with higher sampling rate (2M vs. 1.25M samples per second), appropriate for space-constrained designs where parallel interface is not required.

Both devices operate within identical temperature ranges (-40°C ~ 85°C) and maintain equivalent moisture sensitivity levels (MSL 3, 168 Hours), ensuring consistent handling and storage requirements. Supply voltage ranges are nominally equivalent, with the AD7986BCPZ providing slightly tighter tolerance specifications (2.375V ~ 2.625V vs. 2.37V ~ 2.63V).

Frequently Asked Questions (FAQ)

Q: Can the AD7986BCPZ directly replace the AD7643BCPZ in existing designs?

A: Direct replacement requires verification of three factors: (1) PCB layout compatibility with the different package footprints (48-LFCSP-VQ 7x7 vs. 20-LFCSP 4x4), (2) interface protocol support (AD7986BCPZ lacks parallel interface), and (3) sampling rate requirements (AD7986BCPZ operates at 2M samples/second vs. 1.25M). If the design uses parallel interface or requires exactly 1.25M sampling rate, substitution is not suitable.

Q: What are the key electrical differences between these parts?

A: Both devices share 18-bit resolution, SAR architecture, single differential input, and identical operating temperature ranges. The primary differences are sampling rate (AD7986BCPZ is faster at 2M vs. 1.25M), available interfaces (AD7643BCPZ includes parallel interface option), and package size (AD7643BCPZ is larger with more pins).

Q: Are the supply voltage ranges compatible?

A: The supply voltage ranges are functionally equivalent. AD7643BCPZ operates at 2.37V ~ 2.63V, while AD7986BCPZ operates at 2.375V ~ 2.625V. Both devices can operate from the same power supply in most practical applications, though the AD7986BCPZ has slightly tighter specifications.

Q: What packaging considerations apply to substitution?

A: The AD7643BCPZ uses a 48-pin 7x7mm package, while the AD7986BCPZ uses a 20-pin 4x4mm package. PCB layout modifications are required for substitution, including trace routing changes, decoupling capacitor repositioning, and potential signal integrity adjustments due to different pin assignments.

Q: Do both parts have equivalent compliance certifications?

A: Yes. Both the AD7643BCPZ and AD7986BCPZ are ROHS3 Compliant and REACH Unaffected, with identical MSL ratings (3, 168 Hours). Compliance documentation and handling requirements are equivalent.