Part A
ADS8509IDW
Texas Instruments
- Lifecycle
- Active
- Stock
- 2404 PCS
- Package
- SOIC-20
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8509IDW and ADS8509IBDWRG4 are functionally equivalent 16-bit SAR analog-to-digital converters sharing the same core architecture, resolution, and input configuration, making them viable substitutes in most designs. The primary distinction lies in the grade and packaging: the IBDWRG4 variant is a higher-grade device supplied in tape-and-reel form, while the IDW is the standard industrial grade in a tube. Designers should confirm the required performance grade and assembly format before substituting, as the electrical specifications are otherwise aligned.
Resolution and Architecture
High match
Input Configuration
High match
Package Type
High match
Performance Grade
Validation required
Parts at a glance
Part B
ADS8509IBDWRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 3062 PCS
- Package
- SOIC-20
- 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 | ADS8509IDW | ADS8509IBDWRG4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Both parts provide identical 16-bit resolution, so conversion accuracy and LSB size are the same. |
| Sampling Rate | 250 kSPS | 250 kSPS | Identical maximum throughput means either part supports the same signal bandwidth and timing budget. |
| Input Type | Single-ended | Single-ended | Same input configuration allows direct substitution without changing the analog front-end topology. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Matching supply requirements means the same power rail design can be reused. |
| Interface | SPI / Serial | SPI / Serial | Identical serial interface ensures firmware and digital host connections remain compatible. |
| Package / Mounting | SOIC-28 (surface mount) | SOIC-28 (surface mount) | Same package and footprint allow drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Equivalent temperature ratings mean both parts suit the same environmental conditions. |
| Ordering / Packaging Suffix | Tube / rail (DW) | Tape and reel, green/RoHS (DWRG4) | The G4 suffix denotes RoHS-compliant green molding compound and reel packaging, which affects assembly handling and compliance requirements. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8509IDW | ADS8509IBDWRG4 |
|---|---|---|
| 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 | SPI | 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 ADS8509IDW and ADS8509IBDWRG4?
Both devices are 16-bit, 250-kSPS successive-approximation register (SAR) analog-to-digital converters from Texas Instruments with the same core architecture, pinout, and SOIC-24 (DW) package. The primary differences are the grade/performance binning and packaging format: the ADS8509IDW is supplied in standard tube packaging and is specified for the industrial temperature range, while the ADS8509IBDWRG4 is the same converter in tape-and-reel packaging (RG4 suffix) with the "B" grade designation. Designers should confirm the exact grade specifications (e.g., INL, offset, gain error) against the respective datasheet ordering information before substitution.
Are the ADS8509IDW and ADS8509IBDWRG4 pin-compatible and footprint-compatible?
Yes. Both parts are offered in the same 24-pin SOIC (DW) package with identical pin functions, so they share the same PCB land pattern. The difference is the delivery format: the ADS8509IDW is provided in tubes, and the ADS8509IBDWRG4 is provided in tape-and-reel for automated assembly. This makes them interchangeable at the board level, provided the electrical grade requirements are met.
What is the resolution and sampling rate of these ADCs?
Both the ADS8509IDW and ADS8509IBDWRG4 are 16-bit successive-approximation register (SAR) analog-to-digital converters with a maximum sampling rate of 250 kSPS. These parameters are common to the ADS8509 family and are stated in the Texas Instruments datasheet.
What analog input range and reference configuration do these converters support?
The ADS8509 family supports a bipolar analog input range of ±10 V (with a 5-V reference) and includes an internal reference plus a reference buffer. The input range and reference configuration are defined in the device datasheet and are identical between the ADS8509IDW and ADS8509IBDWRG4, since both belong to the same ADS8509 product family.
What digital interface do the ADS8509IDW and ADS8509IBDWRG4 provide?
Both devices provide a parallel digital output interface with a 16-bit data bus, along with standard control signals (such as conversion start and read/busy) for interfacing to microcontrollers, DSPs, or FPGAs. The interface timing and pin functions are common to the ADS8509 family and are documented in the Texas Instruments datasheet.
What supply voltage do these ADCs require?
The ADS8509 family operates from a single 5-V analog supply (with the digital interface also referenced to the 5-V supply in the standard configuration). Designers should verify the exact supply and reference requirements in the Texas Instruments datasheet for the specific grade ordered, as the ADS8509IDW and ADS8509IBDWRG4 share the same supply specifications.
Can the ADS8509IBDWRG4 be used as a drop-in replacement for the ADS8509IDW in an existing design?
Because both parts share the same 24-pin SOIC (DW) package, pinout, and ADS8509 core architecture, the ADS8509IBDWRG4 can generally serve as a drop-in replacement for the ADS8509IDW at the board level. However, the "B" grade designation may correspond to different specified performance limits (such as INL or offset/gain error), so the designer must confirm that the grade-specific specifications meet the application requirements by consulting the Texas Instruments datasheet ordering information before substituting.
Why would a designer choose the tape-and-reel ADS8509IBDWRG4 over the tube-packaged ADS8509IDW?
The ADS8509IBDWRG4 is supplied in tape-and-reel (RG4 suffix) format, which is suited to high-volume automated pick-and-place assembly lines, whereas the ADS8509IDW is supplied in tubes, which is often preferred for prototyping, low-volume runs, or manual assembly. The choice is therefore primarily a packaging and production-format decision rather than a functional one, since both share the same converter core and package.