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 ADS8505IDWG4 are functionally equivalent 16-bit successive-approximation ADCs sharing identical core specifications, differing only in packaging format (tube vs. tape-and-reel). The ADS8505IDWG4 is a valid drop-in replacement for the ADS8505IBDW in automated assembly environments, with no electrical or footprint changes required.
Resolution and Architecture
High match
Package and Pinout
High match
Supply Voltage and Interface
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADS8505IDWG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4324 PCS
- Package
- SOIC-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 | ADS8505IDWG4 | 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 single-ended input architecture allows direct substitution without changing the analog front end. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Matching 5 V supply requirements means the same power rail design can be reused. |
| Interface | Parallel | Parallel | Identical parallel interface ensures the same host bus and timing configuration apply. |
| Package / Case | 28-SOIC | 28-SOIC | Same SOIC-28 footprint allows drop-in board replacement without layout changes. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Identical industrial temperature range means both parts suit the same environmental conditions. |
| Reference Type | Internal | Internal | Both include an internal reference, so no external reference circuit change is needed. |
| Mounting Type | Surface Mount | Surface Mount | Same surface-mount assembly method keeps the manufacturing process unchanged. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8505IBDW | ADS8505IDWG4 |
|---|---|---|
| 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 | 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 is the difference between the ADS8505IBDW and the ADS8505IDWG4?
The ADS8505IBDW and ADS8505IDWG4 are functionally identical 16-bit successive-approximation analog-to-digital converters from Texas Instruments. The primary difference is the ordering suffix: the "G4" designation on the ADS8505IDWG4 indicates lead-free (RoHS-compliant) construction, while the ADS8505IBDW is the standard non-G4 orderable variant. Both are specified with the same electrical performance and are supplied in a 28-pin SOIC (DW) package.
Are the ADS8505IBDW and ADS8505IDWG4 electrically interchangeable?
Yes. Both devices share the same 16-bit SAR ADC core, the same pinout in the 28-pin SOIC (DW) package, and the same specified performance grades. The "G4" suffix denotes a lead-free/RoHS-compliant finish rather than a change in electrical characteristics, so they are interchangeable in terms of function and specifications.
What are the key performance specifications of the ADS8505?
The ADS8505 is a 16-bit successive-approximation ADC with a maximum throughput of 250 kSPS. It operates from a single 5 V analog supply and features an on-chip sample-and-hold, a parallel interface, and a specified input range of ±10 V (bipolar) with an internal reference. It is offered in the 28-pin SOIC (DW) package.
Do both parts use the same package and pinout?
Yes. Both the ADS8505IBDW and ADS8505IDWG4 are supplied in the 28-pin SOIC (DW) package with identical pin assignments, so PCB land patterns and pin functions are the same for both orderable variants.
Does the "G4" suffix affect RoHS compliance?
Yes. The "G4" suffix on the ADS8505IDWG4 designates the lead-free (RoHS-compliant) version of the device. The ADS8505IBDW is the standard orderable variant without the G4 designation. Designers with RoHS requirements should confirm the specific orderable part number against the manufacturer's product documentation.
Can the ADS8505IBDW and ADS8505IDWG4 be used in the same design without changes?
Yes, from an electrical and footprint standpoint they are interchangeable because they share the same die, package, pinout, and specified performance. The only practical consideration is the RoHS/lead-free status associated with the G4 suffix, which should be matched to the assembly and compliance requirements of the design.
What supply voltage and interface does the ADS8505 family use?
The ADS8505 operates from a single 5 V analog supply and provides a parallel digital output interface. It includes an on-chip sample-and-hold and internal reference, and is specified for a ±10 V bipolar input range, making it suitable for industrial data-acquisition applications.