Part A
ADS8505IBDW
Техасские инструменты
- Lifecycle
- Active
- Stock
- 6935 ПКС
- Package
- SOIC-28
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8505IBDW and ADS8509IBDBG4 are both 16-bit successive-approximation analog-to-digital converters sharing the same core resolution, serial interface, and 5 V supply architecture, making the ADS8509IBDBG4 a viable functional replacement candidate for the ADS8505IBDW in many designs. However, the two devices differ in package footprint and input voltage range, so board-level layout and analog front-end scaling must be validated before substitution.
Resolution and Architecture
High match
Digital Interface
High match
Package Type
Validation required
Input Voltage Range
Validation required
Parts at a glance
Part B
ADS8509IBDBG4
Техасские инструменты
- Lifecycle
- Active
- Stock
- 2562 ПКС
- Package
- SSOP-28
- Series
- Сбор данных - аналогово-цифровые преобразователи (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 | ADS8509IBDBG4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both are 16-bit SAR ADCs, so resolution is identical and not a differentiator for substitutability. |
| Sampling Rate | 250 kSPS | 250 kSPS | Identical throughput means either part can meet the same acquisition timing requirements. |
| Input Type | Single-ended | Single-ended | Both accept single-ended analog inputs, so signal conditioning circuitry can remain unchanged. |
| Supply Voltage (Analog) | 5 V | 5 V | Matching analog supply simplifies power rail design and ensures comparable input range. |
| Interface | Parallel | SPI / Serial | Different digital interfaces require different host connections and firmware, directly affecting drop-in substitutability. |
| Package | SOIC-28 (DW) | SSOP-28 (DB) | Different package footprints require PCB layout changes, so the parts are not physically interchangeable. |
| Operating Temperature Range | -40 to +85 °C | -40 to +85 °C | Identical temperature ratings mean both suit the same environmental conditions. |
| Reference Type | Internal | Internal | Both include an internal reference, reducing external component count equally. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8505IBDW | ADS8509IBDBG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| 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 ~ 85°C |
Frequently asked questions
What are the key differences between the ADS8505IBDW and ADS8509IBDBG4?
The ADS8505IBDW is a 16-bit successive-approximation ADC in a 28-pin SOIC (DW) package, while the ADS8509IBDBG4 is a 16-bit SAR ADC in a 28-pin SSOP (DB) package. Both are pin-compatible members of the ADS850x family but differ in package type, which affects PCB land pattern and thermal characteristics. The ADS8509IBDBG4 is supplied in a Pb-free/RoHS-compliant SSOP package as indicated by the G4 suffix.
Are the ADS8505IBDW and ADS8509IBDBG4 functionally interchangeable?
Functionally, both are 16-bit SAR ADCs with similar resolution and serial interface, but they are not drop-in replacements because the ADS8505IBDW uses a 28-pin SOIC (DW) package and the ADS8509IBDBG4 uses a 28-pin SSOP (DB) package. The different package footprints require different PCB land patterns, so substitution requires layout changes and validation against the respective datasheets.
What is the resolution and architecture of these ADCs?
Both the ADS8505IBDW and ADS8509IBDBG4 are 16-bit analog-to-digital converters using successive-approximation register (SAR) architecture, providing 16-bit resolution for precision measurement applications.
What package types do the ADS8505IBDW and ADS8509IBDBG4 use?
The ADS8505IBDW is housed in a 28-pin SOIC package (DW suffix). The ADS8509IBDBG4 is housed in a 28-pin SSOP package (DB suffix). The G4 suffix on the ADS8509IBDBG4 denotes Pb-free/RoHS-compliant construction.
Do both parts support the same serial interface?
Both devices are members of the ADS850x family and provide a serial digital interface for connection to microcontrollers and DSPs. Designers should confirm the exact interface timing and pin assignments against the respective manufacturer datasheets before finalizing a design, since package differences affect pinout.
Which part should be selected for a Pb-free/RoHS-compliant design?
The ADS8509IBDBG4 carries the G4 suffix, indicating Pb-free/RoHS-compliant construction, making it the appropriate choice for designs requiring RoHS compliance. The ADS8505IBDW should be verified against its specific ordering code and datasheet for compliance status before use in RoHS-restricted applications.
Can the ADS8505IBDW be replaced by the ADS8509IBDBG4 without PCB redesign?
No. Because the ADS8505IBDW uses a 28-pin SOIC (DW) footprint and the ADS8509IBDBG4 uses a 28-pin SSOP (DB) footprint, the PCB land patterns differ. A direct replacement without PCB redesign is not possible; layout changes and revalidation against the manufacturer datasheet are required.