ADS8505IBDWR 16-Bit SAR ADC Equivalent & Substitute Parts

Part Overview

The ADS8505IBDWR is a 16-bit successive approximation register (SAR) analog-to-digital converter manufactured by Texas Instruments. This single-channel data acquisition IC operates at 250 kSPS sampling rate with external or internal reference capability, housed in a 28-SOIC surface mount package. The device is Active product status and ROHS3 compliant, suitable for industrial and commercial measurement applications requiring high-resolution analog signal conversion.

Substitute parts become necessary when the primary device experiences supply constraints, extended lead times, or when design flexibility permits selection from qualified alternatives meeting equivalent electrical and mechanical specifications.

Substiute Parts

ADS8505IBDWR

Texas InstrumentsIn Stock: 2433ADS8505IBDWR Datasheet

Current PartRFQ

AD976ABRZ

Analog Devices Inc.In Stock: 1185AD976ABRZ Datasheet

MFR RecommendedRFQ

AD976ARZ

Analog Devices Inc.In Stock: 3508AD976ARZ Datasheet

MFR RecommendedRFQ

AD976BRZ

Analog Devices Inc.In Stock: 3739AD976BRZ Datasheet

MFR RecommendedRFQ

LTC1605ACSW#PBF

Analog Devices Inc.In Stock: 1106LTC1605ACSW#PBF Datasheet

MFR RecommendedRFQ

LTC1605AISW#PBF

Analog Devices Inc.In Stock: 1277LTC1605AISW#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

Mandatory Equivalence Criteria:

• Resolution: 16 Bit
• Number of Inputs: 1
• Input Type: Single Ended
• Architecture: SAR
• Data Interface: Parallel
• Reference Type: External, Internal
• Analog Supply Voltage: 5V
• Digital Supply Voltage: 5V
• Package: 28-SOIC (0.295", 7.50mm Width)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant

Variable Parameters (Allowed Differences):

• Sampling Rate: 100 kSPS to 250 kSPS
• Operating Temperature Range: 0°C ~ 70°C or -40°C ~ 85°C
• Moisture Sensitivity Level: 1 to 3
• Manufacturer: Texas Instruments or Analog Devices Inc.

All five substitute parts meet the mandatory equivalence criteria. Differences in sampling rate and operating temperature represent design trade-offs that do not prevent functional substitution in applications where the lower performance specifications remain acceptable.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute (Highest Compatibility): AD976ABRZ maintains the widest operational envelope with -40°C ~ 85°C temperature range matching the ADS8505IBDWR, while delivering 200 kSPS sampling rate. This part accommodates applications where the 250 kSPS specification is not a limiting requirement. Active product status and ROHS3 compliance ensure long-term availability and regulatory alignment.

Secondary Substitutes (Temperature-Matched): AD976ARZ and AD976BRZ provide 100 kSPS sampling capability with identical -40°C ~ 85°C operating range. These parts are suitable for applications with lower bandwidth requirements. Both maintain Active product status and ROHS3 compliance.

Conditional Substitute (Restricted Temperature Range): LTC1605ACSW#PBF operates within 0°C ~ 70°C range, restricting use to commercial temperature applications. Selection requires confirmation that the narrower operating window aligns with end-use environment specifications.

Extended Temperature Substitute (Optimal Moisture Performance): LTC1605AISW#PBF combines -40°C ~ 85°C operating range with MSL 1 (Unlimited) moisture sensitivity rating, providing superior reliability in high-humidity storage and assembly environments compared to the ADS8505IBDWR MSL 2 specification.

All substitute parts carry Active product status, ROHS3 compliance, and REACH Unaffected designation, confirming regulatory qualification for industrial and commercial deployment.

Frequently Asked Questions (FAQ)

Q: Can AD976ARZ replace ADS8505IBDWR in a high-speed data acquisition system? A: AD976ARZ operates at 100 kSPS versus the ADS8505IBDWR 250 kSPS specification. Substitution is valid only if the application's signal bandwidth requirement does not exceed 100 kSPS. Verify Nyquist sampling criteria for your analog input frequency content before selection.

Q: What is the difference between AD976ABRZ and AD976ARZ? A: Both parts are Analog Devices AD976 architecture devices with identical -40°C ~ 85°C operating range and ROHS3 compliance. AD976ABRZ delivers 200 kSPS sampling rate, while AD976ARZ delivers 100 kSPS. Selection depends on required bandwidth. Both maintain parallel data interface and 16-bit resolution.

Q: Is LTC1605ACSW#PBF suitable for industrial temperature applications? A: LTC1605ACSW#PBF operates within 0°C ~ 70°C range, which is restricted to commercial temperature specifications. Industrial applications requiring -40°C ~ 85°C operation must use LTC1605AISW#PBF instead.

Q: Do all substitute parts use the same 28-SOIC package? A: Yes. All substitute parts use 28-SOIC (0.295", 7.50mm Width) surface mount packaging, ensuring mechanical and electrical compatibility with existing PCB layouts designed for ADS8505IBDWR.

Q: What does MSL rating mean for component selection? A: Moisture Sensitivity Level (MSL) indicates maximum storage duration at specified humidity before reflow soldering. ADS8505IBDWR carries MSL 2 (1 Year). LTC1605 series parts carry MSL 1 (Unlimited), providing extended shelf life. AD976 series carries MSL 3 (168 Hours), requiring shorter storage windows. Select based on supply chain and manufacturing schedule requirements.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification, meeting European Union Restriction of Hazardous Substances requirements for lead-free manufacturing and deployment.