AD7658BSTZ Equivalent & Substitute Parts

Part Overview

The AD7658BSTZ is a 12-bit Analog to Digital Converter (ADC) manufactured by Analog Devices Inc., designed for simultaneous sampling applications requiring multiple input channels. This SAR (Successive Approximation Register) architecture device features 6 independent input channels with 6 integrated sample-and-hold circuits, operating at a 250 kSPS sampling rate. The device is actively produced and widely used in data acquisition systems requiring simultaneous multi-channel conversion with true bipolar input capability.

Substitute parts are identified when they maintain identical electrical specifications, mechanical compatibility, and functional performance characteristics while offering alternative sourcing options or inventory availability.

Key Parameters

Parameter	Value
Number of Bits	12
Sampling Rate (Per Second)	250k
Number of Inputs	6
Input Type	Single Ended
Data Interface	SPI, Parallel, DSP
Number of A/D Converters	6
Architecture	SAR
Reference Type	External, Internal
Voltage - Supply, Analog	5V
Voltage - Supply, Digital	5V
Features	Simultaneous Sampling, True Bipolar
Operating Temperature	-40°C ~ 85°C
Package / Case	64-LQFP (10x10)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the AD7658BSTZ is determined by strict equivalence across the following critical parameters:

Resolution: 12-bit conversion accuracy
Sampling Performance: 250 kSPS per channel
Channel Configuration: 6 independent input channels with 6 simultaneous sample-and-hold circuits
Input Architecture: Single-ended input topology
Communication Protocols: SPI, Parallel, and DSP interface support
Power Supply Requirements: 5V analog and digital supply voltages
Functional Features: Simultaneous sampling capability and true bipolar input support
Thermal Range: -40°C to 85°C operating temperature
Physical Form Factor: 64-pin LQFP package (10x10 mm)
Surface Mount Configuration: Standard PCB assembly compatibility

Only parts matching all these parameters across electrical, mechanical, and functional dimensions qualify as direct substitutes.

Parameter Comparison

Parameter	AD7658BSTZ	AD7658BSTZ-1	Match
Manufacturer	Analog Devices Inc.	Analog Devices Inc.	✓
Number of Bits	12	12	✓
Sampling Rate (Per Second)	250k	250k	✓
Number of Inputs	6	6	✓
Input Type	Single Ended	Single Ended	✓
Data Interface	SPI, Parallel, DSP	SPI, Parallel, DSP	✓
Number of A/D Converters	6	6	✓
Architecture	SAR	SAR	✓
Reference Type	External, Internal	External, Internal	✓
Voltage - Supply, Analog	5V	5V	✓
Voltage - Supply, Digital	5V	5V	✓
Features	Simultaneous Sampling, True Bipolar	Simultaneous Sampling, True Bipolar	✓
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	✓
Package / Case	64-LQFP (10x10)	64-LQFP (10x10)	✓
Mounting Type	Surface Mount	Surface Mount	✓
Series	iCMOS®	iCMOS®	✓
Product Status	Active	Active	✓
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	✓
Moisture Sensitivity Level (MSL)	3 (168 Hours)	3 (168 Hours)	✓
REACH Status	REACH Unaffected	REACH Unaffected	✓

Engineering Selection Recommendations

Both the AD7658BSTZ and AD7658BSTZ-1 are actively produced devices with identical electrical and mechanical specifications. Selection between these parts should be based on:

Inventory availability and lead time requirements
Supply chain continuity and sourcing strategy
Compliance requirements: Both parts maintain ROHS3 compliance and REACH unaffected status
Moisture handling: Both parts carry MSL Level 3 (168 hours), requiring equivalent storage and handling protocols
Manufacturing date code considerations for long-term reliability in critical applications

No technical performance differentiation exists between these parts. Direct substitution is permissible in all applications where the AD7658BSTZ is specified.

Frequently Asked Questions (FAQ)

Q: Can AD7658BSTZ-1 be used as a direct replacement for AD7658BSTZ in production designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. No design modifications or re-qualification are required for substitution.

Q: Are there any differences in sampling performance between these parts?

A: No. Both parts operate at 250 kSPS with identical 12-bit resolution, 6-channel configuration, and simultaneous sampling capability.

Q: Do these parts require different PCB layouts or component footprints?

A: No. Both parts use the 64-LQFP (10x10 mm) surface mount package with identical pin assignments and mechanical dimensions.

Q: What is the significance of the "-1" suffix in AD7658BSTZ-1?

A: The "-1" suffix indicates a variant designation from Analog Devices Inc. but does not reflect functional or electrical differences from the base AD7658BSTZ part number.

Q: Are moisture sensitivity requirements identical for both parts?

A: Yes. Both parts carry MSL Level 3 (168 hours), requiring identical storage conditions and handling procedures prior to assembly.

Q: Can these parts be mixed in the same production batch?

A: Yes. Identical specifications permit interchangeable use within the same assembly process without process modifications.

Q: What compliance certifications apply to both parts?

A: Both parts are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components.

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