AD7643BSTZRL Equivalent & Substitute Parts

Part Overview

The AD7643BSTZRL is an 18-bit Analog to Digital Converter (ADC) manufactured by Analog Devices Inc., part of the PulSAR® series. This SAR (Successive Approximation Register) architecture device features a single differential input with a 1.25 MHz sampling rate and supports multiple data interfaces including SPI, Parallel, and DSP. The device is housed in a 48-LQFP (7x7) package and operates across the -40°C to 85°C temperature range. Currently in active production status with 855 units in stock, this component is widely used in precision data acquisition applications requiring high-resolution analog signal conversion.

Alternative models may be required due to package availability constraints, higher sampling rate requirements, or specific application space limitations where smaller form factors are necessary.

Substiute Parts

AD7643BSTZRL

Analog Devices Inc.In Stock: 962AD7643BSTZRL Datasheet

Current PartRFQ

AD7986BCPZ

Analog Devices Inc.In Stock: 1418AD7986BCPZ Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the AD7643BSTZRL is permissible with the AD7986BCPZ based on the following core electrical and mechanical compatibility criteria:

Electrical Compatibility Parameters:

• Resolution: Both devices maintain 18-bit resolution
• Input Configuration: Both feature single differential input
• Architecture: Both utilize SAR topology
• Reference Type: Both support external and internal reference options
• Supply Voltage Range: Both operate within compatible 2.37V–2.625V analog and digital supply ranges
• Operating Temperature: Both rated for -40°C to 85°C
• Data Interface: Both support SPI and DSP protocols (note: AD7986BCPZ does not include Parallel interface)

Mechanical Compatibility Parameters:

• Mounting Type: Both are surface mount devices
• RoHS Compliance: Both are ROHS3 compliant
• MSL Rating: Both rated at MSL 3 (168 Hours)
• Manufacturer: Both manufactured by Analog Devices Inc.

Differentiation Parameters:

• Sampling Rate: AD7986BCPZ operates at 2M samples per second (higher than AD7643BSTZRL at 1.25M)
• Package Form Factor: AD7643BSTZRL uses 48-LQFP (7x7); AD7986BCPZ uses 20-LFCSP (4x4)
• Packaging Type: AD7643BSTZRL supplied in Tape & Reel; AD7986BCPZ supplied in Tray

Parameter Comparison

Engineering Selection Recommendations

Both the AD7643BSTZRL and AD7986BCPZ are active production devices from Analog Devices Inc. with full ROHS3 compliance and identical MSL ratings, ensuring equivalent regulatory and environmental qualification status.

Selection between these devices should be based on application-specific requirements:

Select AD7643BSTZRL when:

• Parallel interface communication is required
• 48-pin LQFP package footprint is compatible with PCB layout
• 1.25 MHz sampling rate meets application bandwidth requirements
• Tape & Reel packaging format is preferred for automated assembly

Select AD7986BCPZ when:

• Higher sampling rate of 2 MHz is required
• Compact 20-pin LFCSP (4x4) form factor is necessary for space-constrained designs
• SPI or DSP interface protocols are sufficient
• Tray packaging format is acceptable

Both devices maintain identical 18-bit resolution, differential input configuration, SAR architecture, and supply voltage compatibility, ensuring functional equivalence within the specified electrical parameters.

Frequently Asked Questions (FAQ)

Q: Can AD7986BCPZ directly replace AD7643BSTZRL in existing designs?

A: Direct replacement requires PCB redesign due to package differences (48-LQFP versus 20-LFCSP). Additionally, if the original design utilizes the Parallel interface, the AD7986BCPZ does not support this protocol and must use SPI or DSP instead. Electrical compatibility is maintained for all other parameters.

Q: What is the primary advantage of AD7986BCPZ over AD7643BSTZRL?

A: The AD7986BCPZ offers a 60% higher sampling rate (2M versus 1.25M samples per second) and a significantly smaller package footprint (20-LFCSP 4x4 versus 48-LQFP 7x7), making it suitable for applications requiring higher throughput or compact board designs.

Q: Are the supply voltage ranges identical between these devices?

A: The supply voltage ranges are functionally equivalent. AD7643BSTZRL operates at 2.37V–2.63V, while AD7986BCPZ operates at 2.375V–2.625V. Both ranges overlap sufficiently for standard 2.5V supply applications.

Q: Do both devices support the same reference configurations?

A: Yes, both AD7643BSTZRL and AD7986BCPZ support external and internal reference types, providing equivalent flexibility in reference circuit design.

Q: What are the packaging and inventory implications?

A: AD7643BSTZRL is supplied in Tape & Reel format with 855 units in stock. AD7986BCPZ is supplied in Tray format with 1366 units in stock. Packaging format selection depends on assembly process requirements and inventory management practices.

Q: Are both devices suitable for the same temperature range applications?

A: Yes, both devices are rated for -40°C to 85°C operating temperature, ensuring equivalent thermal performance across industrial and commercial temperature ranges.