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ADS8505IDB Equivalent & Substitute Parts
Part Overview
The ADS8505IDB is a 16-bit Analog-to-Digital Converter (ADC) manufactured by Texas Instruments, featuring single-ended input, SAR architecture, and 250k samples per second sampling rate in a 28-SSOP surface mount package. The device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain functional compatibility across core electrical parameters including bit resolution, sampling rate, input configuration, and supply voltage specifications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Number of Bits | 16 |
| Sampling Rate (Per Second) | 250k |
| Number of Inputs | 1 |
| Input Type | Single Ended |
| Data Interface | Parallel |
| Architecture | SAR |
| Reference Type | External, Internal |
| Voltage - Supply, Analog | 5V |
| Voltage - Supply, Digital | 5V |
| Package / Case | 28-SSOP (0.209", 5.30mm Width) |
| Operating Temperature | -40°C ~ 85°C |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) |
Substitute Part Grouping Explanation
Substitution eligibility is determined by strict adherence to the following core parameters:
Primary Compatibility Criteria:
- 16-bit resolution (mandatory)
- Single-ended input configuration (mandatory)
- Parallel data interface (mandatory)
- SAR architecture (mandatory)
- 5V analog and digital supply voltage (mandatory)
- 28-SSOP package (mandatory)
- External and internal reference type support (mandatory)
Secondary Compatibility Criteria:
- Sampling rate: 250k samples per second (primary requirement) or lower rates acceptable for reduced-speed applications
- Operating temperature range: -40°C to 85°C (primary requirement) or narrower ranges acceptable for limited-temperature applications
- RoHS3 compliance (required)
- REACH unaffected status (required)
Substitute parts are grouped by sampling rate capability and operating temperature range to facilitate selection based on application requirements.
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Bits | Sampling Rate (kSPS) | Operating Temp (°C) | Packaging | Product Status | MSL |
|---|---|---|---|---|---|---|---|
| ADS8505IDB | Texas Instruments | 16 | 250 | -40 ~ 85 | 28-SSOP | Obsolete | 2 (1 Year) |
| ADS8505IBDB | Texas Instruments | 16 | 250 | -40 ~ 85 | 28-SSOP | Active | 2 (1 Year) |
| AD976AARSZRL | Analog Devices Inc. | 16 | 200 | -40 ~ 85 | 28-SSOP | Active | 3 (168 Hours) |
| AD976ABRSZRL | Analog Devices Inc. | 16 | 200 | -40 ~ 85 | 28-SSOP | Active | 3 (168 Hours) |
| AD976ARSZRL | Analog Devices Inc. | 16 | 100 | -40 ~ 85 | 28-SSOP | Active | 3 (168 Hours) |
| LTC1605-2CG#PBF | Analog Devices Inc. | 16 | 100 | 0 ~ 70 | 28-SSOP | Active | 1 (Unlimited) |
| LTC1605-2CG#TRPBF | Analog Devices Inc. | 16 | 100 | 0 ~ 70 | 28-SSOP | Active | 1 (Unlimited) |
| LTC1605-2IG#TRPBF | Analog Devices Inc. | 16 | 100 | -40 ~ 85 | 28-SSOP | Active | 1 (Unlimited) |
| LTC1606CG#PBF | Analog Devices Inc. | 16 | 250 | 0 ~ 70 | 28-SSOP | Active | 1 (Unlimited) |
| LTC1606CG#TRPBF | Analog Devices Inc. | 16 | 250 | 0 ~ 70 | 28-SSOP | Active | 1 (Unlimited) |
| LTC1606IG#TRPBF | Analog Devices Inc. | 16 | 250 | -40 ~ 85 | 28-SSOP | Active | 1 (Unlimited) |
Engineering Selection Recommendations
Tier 1 - Direct Replacement (Identical Specifications): ADS8505IBDB is the manufacturer-recommended direct replacement. It maintains identical electrical specifications (16-bit, 250k SPS, -40°C to 85°C) and package format while offering active product status and improved availability. This part is the primary choice for direct substitution.
Tier 2 - Full-Range Temperature Compatibility (Reduced Sampling Rate): AD976AARSZRL and AD976ABRSZRL provide 200k SPS sampling rate with full -40°C to 85°C operating range. These parts are suitable for applications where 200k SPS meets performance requirements and extended temperature operation is necessary.
AD976ARSZRL provides 100k SPS sampling rate with full -40°C to 85°C operating range. This part is suitable for lower-speed data acquisition applications requiring extended temperature operation.
LTC1605-2IG#TRPBF provides 100k SPS sampling rate with full -40°C to 85°C operating range and superior moisture sensitivity rating (MSL 1).
LTC1606IG#TRPBF provides 250k SPS sampling rate with full -40°C to 85°C operating range and superior moisture sensitivity rating (MSL 1), making it functionally equivalent to the original part with enhanced reliability characteristics.
Tier 3 - Commercial Temperature Range (0°C to 70°C): LTC1605-2CG#PBF and LTC1605-2CG#TRPBF provide 100k SPS sampling rate for commercial temperature applications.
LTC1606CG#PBF and LTC1606CG#TRPBF provide 250k SPS sampling rate for commercial temperature applications with identical sampling performance to the original part.
All substitute parts maintain ROHS3 compliance and REACH unaffected status. Packaging options include tube and tape & reel formats to accommodate different procurement and assembly requirements.
Frequently Asked Questions (FAQ)
Q: Can ADS8505IBDB directly replace ADS8505IDB? A: Yes. ADS8505IBDB is the manufacturer-recommended successor with identical electrical specifications, package format, and operating temperature range. The primary difference is active product status versus obsolete status.
Q: What is the difference between 250k SPS and 100k SPS sampling rates? A: Sampling rate determines the maximum frequency of analog signals that can be accurately digitized. 250k SPS supports higher-frequency signal acquisition. 100k SPS is suitable for lower-frequency applications. Selection depends on the maximum signal frequency in your application.
Q: Are LTC1606 parts compatible with ADS8505IDB? A: LTC1606 parts maintain identical 16-bit resolution, single-ended input, SAR architecture, 5V supply voltage, and 28-SSOP package. LTC1606CG#TRPBF and LTC1606IG#TRPBF both support 250k SPS. Temperature range varies: LTC1606CG#TRPBF operates 0°C to 70°C (commercial), while LTC1606IG#TRPBF operates -40°C to 85°C (industrial). Selection depends on your operating temperature requirements.
Q: What does MSL (Moisture Sensitivity Level) mean? A: MSL indicates the maximum time a component can be exposed to ambient conditions before soldering. MSL 1 (unlimited) allows indefinite storage. MSL 2 (1 Year) requires soldering within one year of packaging. MSL 3 (168 Hours) requires soldering within one week. Higher MSL ratings provide greater handling flexibility.
Q: Can I use AD976ARSZRL as a substitute if my application only requires 100k SPS? A: Yes. AD976ARSZRL provides 100k SPS sampling rate with full -40°C to 85°C operating range, matching the original part's temperature specifications. It is suitable for applications where 100k SPS meets performance requirements.
Q: What packaging options are available? A: Substitute parts are available in tube packaging (standard) and tape & reel (TR) packaging for automated assembly. Select based on your procurement and assembly process requirements.
Q: Are all substitute parts RoHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, meeting current environmental and regulatory requirements.
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