ADS8505IDWR Equivalent & Substitute Parts

Part Overview

The ADS8505IDWR is a 16-bit Analog to Digital Converter manufactured by Texas Instruments, configured as a single-channel SAR (Successive Approximation Register) ADC in a 28-SOIC surface mount package. This device operates with external or internal voltage references and supports 250k samples per second sampling rate. The part is currently in active production status with ROHS3 compliance and is suitable for data acquisition applications requiring parallel interface communication. Substitute parts are identified when equivalent electrical specifications and mechanical compatibility are maintained across the same package footprint and functional architecture.

Key Parameters

Parameter	Value
Resolution	16 Bit
Sampling Rate	250k Samples Per Second
Number of Inputs	1
Input Type	Single Ended
Data Interface	Parallel
Architecture	SAR
Reference Type	External, Internal
Analog Supply Voltage	5V
Digital Supply Voltage	5V
Operating Temperature Range	-40°C to 85°C
Package	28-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the ADS8505IDWR is determined by strict equivalence in the following parameters: 16-bit resolution, single-channel single-ended input configuration, parallel data interface, SAR architecture, 5V analog and digital supply voltages, -40°C to 85°C operating temperature range, and 28-SOIC package footprint. Substitute parts must maintain these core electrical and mechanical specifications to ensure direct functional replacement without circuit redesign.

The identified substitute parts are grouped into two categories based on sampling rate performance:

Category 1 - Full Performance Match (250k SPS): LTC1606ISW#PBF maintains identical 250k samples per second sampling rate as the primary part.

Category 2 - Reduced Sampling Rate (100k-200k SPS): AD976AARZ (200k SPS), AD976ARZ (100k SPS), AD976BRZ (100k SPS), and AD976CRZ (100k SPS) operate at lower sampling rates but maintain all other electrical and mechanical parameters.

Parameter Comparison

Parameter	ADS8505IDWR	AD976AARZ	AD976ARZ	AD976BRZ	AD976CRZ	LTC1606ISW#PBF
Manufacturer	Texas Instruments	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.	Analog Devices Inc.
Resolution	16 Bit	16 Bit	16 Bit	16 Bit	16 Bit	16 Bit
Sampling Rate (SPS)	250k	200k	100k	100k	100k	250k
Number of Inputs	1	1	1	1	1	1
Input Type	Single Ended	Single Ended	Single Ended	Single Ended	Single Ended	Single Ended
Data Interface	Parallel	Parallel	Parallel	Parallel	Parallel	Parallel
Architecture	SAR	SAR	SAR	SAR	SAR	SAR
Reference Type	External, Internal	External, Internal	External, Internal	External, Internal	External, Internal	External, Internal
Analog Supply Voltage	5V	5V	5V	5V	5V	5V
Digital Supply Voltage	5V	5V	5V	5V	5V	5V
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Package	28-SOIC	28-SOIC	28-SOIC	28-SOIC	28-SOIC	28-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	2 (1 Year)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

All identified substitute parts maintain active product status and ROHS3 compliance, meeting regulatory requirements equivalent to the ADS8505IDWR. Selection between substitute options depends on application-specific sampling rate requirements.

For applications requiring 250k samples per second performance, LTC1606ISW#PBF provides direct functional equivalence with identical sampling rate specification. This part additionally offers superior moisture sensitivity level rating (MSL 1 Unlimited) compared to the primary part (MSL 2, 1 Year), providing extended shelf life and reduced moisture-related handling constraints.

For applications where sampling rates of 200k SPS or lower are acceptable, the AD976 series variants (AD976AARZ at 200k SPS, or AD976ARZ, AD976BRZ, AD976CRZ at 100k SPS) provide functional substitution. These parts are available in higher inventory quantities and maintain identical electrical specifications across all other parameters.

All substitute parts are packaged in 28-SOIC surface mount configuration with identical footprint dimensions (0.295", 7.50mm Width), enabling direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can AD976ARZ, AD976BRZ, or AD976CRZ be used as direct replacements for ADS8505IDWR?

A: These parts are functionally compatible substitutes provided the application does not require 250k samples per second sampling rate. All three variants operate at 100k SPS, which is lower than the primary part's 250k SPS specification. They maintain identical 16-bit resolution, single-channel single-ended input configuration, parallel interface, SAR architecture, 5V supply voltages, and 28-SOIC package footprint. Selection is appropriate only when the system design accommodates reduced sampling rate performance.

Q: What is the difference between AD976AARZ and the other AD976 variants?

A: AD976AARZ operates at 200k samples per second, providing higher sampling rate performance than AD976ARZ, AD976BRZ, and AD976CRZ, which all operate at 100k SPS. All four variants share identical 16-bit resolution, input configuration, reference type, supply voltages, operating temperature range, and 28-SOIC package specification. AD976AARZ is the preferred AD976 series option when higher sampling rate is required within the reduced performance envelope.

Q: Is LTC1606ISW#PBF a complete equivalent to ADS8505IDWR?

A: LTC1606ISW#PBF maintains all electrical specifications of the ADS8505IDWR, including 16-bit resolution, 250k samples per second sampling rate, single-channel single-ended input, parallel data interface, SAR architecture, 5V analog and digital supply voltages, -40°C to 85°C operating temperature range, and 28-SOIC package footprint. The part is manufactured by Analog Devices Inc. and carries ROHS3 compliance. LTC1606ISW#PBF additionally provides MSL 1 (Unlimited) moisture sensitivity rating, offering extended shelf life compared to the primary part's MSL 2 (1 Year) specification.

Q: Are all substitute parts available in the same packaging format?

A: The ADS8505IDWR is supplied in Tape & Reel (TR) packaging. All identified substitute parts are supplied in Tube packaging. Both packaging formats are suitable for surface mount assembly; however, reel-based automation may require adjustment for tube-packaged components. The 28-SOIC package footprint remains identical across all parts, ensuring PCB compatibility.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 export classification, matching the regulatory profile of the ADS8505IDWR. Moisture sensitivity level (MSL) ratings vary: ADS8505IDWR is MSL 2 (1 Year), AD976 series variants are MSL 3 (168 Hours), and LTC1606ISW#PBF is MSL 1 (Unlimited). These ratings affect storage and handling requirements but do not impact functional performance in deployed applications.

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