Part A
ADS8509IDW
德州儀器
- Lifecycle
- Active
- Stock
- 2404 件
- Package
- SOIC-20
- Series
- 資料獲取-模數轉換器（ADC）
Replacement verdict
Compatible functional replacement candidate
The ADS8506IDWG4 is a viable functional replacement candidate for the ADS8509IDW, sharing the same 16-bit SAR architecture, 5V supply, and 20-pin SOIC footprint, though the designer must validate the reduced 250 kSPS throughput and the narrower input voltage range against the target application requirements.
Resolution and Architecture
High match
Package and Pinout
High match
Sampling Rate
Validation required
Input Voltage Range
Validation required
Parts at a glance
Part B
ADS8506IDWG4
德州儀器
- Lifecycle
- Active
- Stock
- 8155 件
- Package
- SOIC-28
- Series
- 資料獲取-模數轉換器（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 | ADS8509IDW | ADS8506IDWG4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 12 bit | Resolution determines the smallest measurable signal step; a 16-bit ADC offers 16x finer quantization than a 12-bit ADC, directly affecting measurement accuracy and dynamic range. |
| Sampling Rate | 250 kSPS | 400 kSPS | Maximum throughput limits the highest signal frequency that can be digitized; the faster part supports wider-bandwidth or multiplexed applications. |
| Number of Input Channels | 1 (single-ended) | 1 (single-ended) | Channel count determines how many analog signals can be measured without external multiplexing; both are single-channel devices here. |
| Input Type | Single-ended | Single-ended | Input configuration affects how the sensor or signal source must be connected and whether common-mode rejection is available. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Supply voltage must match the system rail; both operate from a single 5 V supply, simplifying power design. |
| Interface | SPI / serial | SPI / serial | The digital interface must be compatible with the host controller; both use a serial SPI-compatible interface. |
| Package | SOIC-28 (wide) | SOIC-28 (wide) | Package footprint and pinout must match for board-level drop-in compatibility; both use the same wide-body SOIC-28 package. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Temperature range defines the environments in which the part can reliably operate; identical industrial ranges here. |
| Reference Type | Internal reference | Internal reference | An internal reference simplifies system design and reduces external component count; both integrate a reference. |
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 | ADS8509IDW | ADS8506IDWG4 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Discontinued at Digi-Key |
| Number of Bits | 16 | 12 |
| Sampling Rate(Per Second) | 250k | 40k |
| Number of Inputs | 1 | 1 |
| Input Type | Single Ended | Single Ended |
| Data Interface | SPI | SPI, Parallel |
| 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 ADS8509IDW and the ADS8506IDWG4?
The ADS8509IDW is a 16-bit successive-approximation ADC with a parallel interface, while the ADS8506IDWG4 is a 12-bit successive-approximation ADC with a serial (SPI-compatible) interface. Both are offered in a 28-pin SOIC (DW) package and operate from a single 5 V supply, but they differ in resolution, digital interface, and pin configuration.
Are the ADS8509IDW and ADS8506IDWG4 pin-compatible?
No. Although both devices use the same 28-pin SOIC (DW) package, their pin functions differ because the ADS8509IDW provides a parallel data bus while the ADS8506IDWG4 provides a serial interface. A direct drop-in replacement is not possible without PCB and firmware changes.
What is the resolution and sampling rate of each device?
The ADS8509IDW offers 16-bit resolution, and the ADS8506IDWG4 offers 12-bit resolution. Both are successive-approximation register (SAR) ADCs. Designers should confirm the required sampling rate against the respective manufacturer datasheet, as the two devices are specified for different throughput classes.
What digital interface does each ADC use?
The ADS8509IDW uses a parallel digital output interface, making it suitable for host processors with a parallel bus. The ADS8506IDWG4 uses a serial interface compatible with SPI, which reduces pin count and suits microcontrollers with serial peripherals.
Do both parts operate from the same analog supply voltage?
Yes. Both the ADS8509IDW and ADS8506IDWG4 are specified for a single 5 V analog supply. Designers should still verify the full recommended operating conditions, including reference and digital supply requirements, in the respective manufacturer datasheets.
Can the ADS8506IDWG4 replace the ADS8509IDW in an existing design?
Not directly. The ADS8506IDWG4 has lower resolution (12-bit versus 16-bit) and a serial rather than parallel interface, so replacing the ADS8509IDW would require firmware changes, a different PCB layout, and revalidation of system accuracy and throughput requirements.
What package do both devices use?
Both the ADS8509IDW and ADS8506IDWG4 are supplied in a 28-pin SOIC package with the DW suffix. The package outline is the same, but pin assignments differ due to the different digital interfaces, so footprint compatibility does not imply electrical compatibility.