Part A
ADS8505IBDW
Texas Instruments
- Lifecycle
- Active
- Stock
- 6935 PCS
- Package
- SOIC-28
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8505IBDW and ADS8509HDB are both 16-bit successive-approximation ADCs sharing a comparable SAR conversion architecture and parallel interface, making the ADS8509HDB a plausible functional candidate for the ADS8505IBDW in applications where the wider specified temperature range and package differences can be accommodated. However, the differing package outlines and operating temperature grades require board-level and thermal validation before committing to a direct substitution.
Resolution and Architecture
Validation required
Package Type
Validation required
Operating Temperature Range
Validation required
Digital Interface
Validation required
Parts at a glance
Part B
ADS8509HDB
Texas Instruments
- Lifecycle
- Active
- Stock
- 9032 PCS
- Package
- SSOP-28
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS8505IBDW | ADS8509HDB | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so they offer the same nominal quantization and dynamic range for the sampled signal. |
| Sampling Rate | 250 kSPS | 250 kSPS | Maximum throughput determines the highest signal bandwidth that can be digitized without aliasing for a given application. |
| Input Type | Single-ended | Single-ended | Single-ended inputs simplify front-end design but offer less common-mode rejection than differential inputs. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Supply requirements dictate the power rail design and compatibility with surrounding logic and analog circuitry. |
| Interface | Parallel (byte/word) | SPI / Serial | The digital interface determines how the ADC connects to the host processor; parallel and serial interfaces are not directly interchangeable without glue logic or firmware changes. |
| Package | 28-pin SOIC (DW) | 28-pin SSOP (DB) | Different package footprints require different PCB land patterns, so a drop-in replacement is not possible without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +125 °C | The wider temperature range of the ADS8509HDB makes it suitable for harsher environments where the ADS8505IBDW may not be rated. |
| Reference | Internal reference | Internal reference | An internal reference reduces external component count and simplifies the analog front-end design. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8505IBDW | ADS8509HDB |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | 250k | 250k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | Parallel | SPI |
| Configuration | S/H-ADC | S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 5V | 5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 175°C |
Frequently asked questions
What are the key differences between the ADS8505IBDW and ADS8509HDB?
The ADS8505IBDW is a 16-bit successive-approximation ADC from Texas Instruments in a 28-pin SOIC package specified over the industrial temperature range, while the ADS8509HDB is a 16-bit SAR ADC in a 28-pin SSOP package specified over the extended/high-reliability temperature range. They differ in package, grade, and specified operating temperature range, so they are not drop-in equivalents.
Do the ADS8505IBDW and ADS8509HDB have the same resolution and architecture?
Yes. Both devices are 16-bit successive-approximation (SAR) analog-to-digital converters, so their core resolution and conversion architecture are the same; the differences lie in package, grade, and specified operating conditions.
Are the ADS8505IBDW and ADS8509HDB pin-compatible?
No. The ADS8505IBDW uses a 28-pin SOIC (DW) package, while the ADS8509HDB uses a 28-pin SSOP (DB) package. Because the package types and PCB land patterns differ, they are not pin-compatible and cannot be interchanged without a board redesign.
Can the ADS8505IBDW be used as a direct substitute for the ADS8509HDB?
No. A direct substitution is not supported because the two parts differ in package (SOIC vs SSOP) and specified temperature grade. Any replacement must be validated against the manufacturer datasheets and the target design requirements.
What is the difference in specified temperature range between the two parts?
The ADS8505IBDW is specified for the industrial temperature range, while the ADS8509HDB is specified for an extended/high-reliability temperature range. The exact temperature limits should be confirmed from the respective Texas Instruments datasheets before use in a design.
Are both devices manufactured by Texas Instruments?
Yes. Both the ADS8505IBDW and the ADS8509HDB are Texas Instruments analog-to-digital converter products, and their technical parameters should be verified against the official TI datasheets.
What should be checked before considering either part for a new design?
Verify the package footprint (28-pin SOIC for the ADS8505IBDW vs 28-pin SSOP for the ADS8509HDB), the specified operating temperature range, and all datasheet parameters such as supply requirements and interface timing against the target application before selecting either device.