Part A
ADS8505IBDW
Texas Instruments
- Lifecycle
- Active
- Stock
- 6935 PCS
- Package
- SOIC-28
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8505IBDW and ADS8505IBDBRG4 are functionally equivalent, sharing identical converter architecture, resolution, and analog front-end characteristics. The only meaningful distinction is the packaging format, with the DW suffix denoting a tube-delivered SOIC-28 and the DB suffix denoting a tape-and-reel SOIC-28. Designers can treat these as interchangeable in new and existing layouts, provided the reel packaging suits the assembly line.
Resolution and Architecture
High match
Analog Input Range
High match
Package Type
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADS8505IBDBRG4
Texas Instruments
- Lifecycle
- Active
- Stock
- 4872 PCS
- Package
- SSOP-28
- Series
- Data Acquisition - Analog to Digital Converters (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 | ADS8505IBDBRG4 | Why it matters |
|---|---|---|---|
| Resolution | 16 bit | 16 bit | Determines the number of discrete output codes and the smallest resolvable analog step; identical resolution means equivalent measurement granularity. |
| Sampling Rate | 250 kSPS | 250 kSPS | Sets the maximum throughput for converting analog signals; matching rates ensure the same dynamic signal bandwidth can be captured. |
| Input Type | Single-ended | Single-ended | Defines how the analog source must be connected; both being single-ended means the same signal conditioning and wiring scheme applies. |
| Supply Voltage | 5 V (analog and digital) | 5 V (analog and digital) | Determines power rail requirements and interface logic levels; identical 5 V operation allows direct substitution without rail changes. |
| Interface | Parallel (byte/word) | Parallel (byte/word) | Defines how the host reads conversion data; matching parallel interface ensures the same microcontroller or DSP bus can be used. |
| Reference Type | Internal reference | Internal reference | Affects accuracy and external component count; both having an internal reference means no external reference circuit redesign is needed. |
| Operating Temperature Range | -40 °C to +85 °C | -40 °C to +85 °C | Defines the environmental envelope for reliable operation; identical ranges mean the same application environments are supported. |
| Package / Mounting | 28-SOIC (tube) | 28-SSOP (tape and reel) | Package footprint and assembly method must match the PCB land pattern; different packages require layout changes and affect board space and manufacturing flow. |
| Packaging / Ordering Format | Tube | Tape and reel | Determines how parts are supplied for production; tube vs. reel affects automated pick-and-place assembly and inventory handling. |
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 | ADS8505IBDBRG4 |
|---|---|---|
| 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 are the key differences between the ADS8505IBDW and ADS8505IBDBRG4?
Both parts are functionally identical 16-bit successive-approximation analog-to-digital converters from Texas Instruments with the same electrical specifications. The primary difference is packaging and shipping format: the ADS8505IBDW is supplied in a 28-pin SOIC (DW) tube/rail package, while the ADS8505IBDBRG4 is the same die in a 28-pin SSOP (DB) package delivered in tape-and-reel (R) form with the G4 lead-free/RoHS designation.
Are the ADS8505IBDW and ADS8505IBDBRG4 electrically interchangeable?
Yes, both devices share the same 16-bit SAR ADC core, sample rate, input range, and digital interface. However, because they use different package types (SOIC vs SSOP), the PCB land patterns and footprint dimensions differ, so they are not drop-in replacements on the same board without layout changes.
What is the resolution and sample rate of these ADCs?
Both the ADS8505IBDW and ADS8505IBDBRG4 are 16-bit successive-approximation ADCs with a maximum sampling rate of 250 kSPS, as specified in the Texas Instruments ADS8505 datasheet.
What analog input range do these devices support?
The ADS8505 family supports a bipolar input range of ±10 V (with a ±10 V reference configuration) and operates from a single +5 V analog supply with an internal reference, per the manufacturer datasheet. Designers should confirm the exact reference and input configuration against the TI datasheet for their specific application.
What digital interface do the ADS8505IBDW and ADS8505IBDBRG4 provide?
Both parts provide a parallel digital output interface with a 16-bit data bus, along with standard control signals (CS, RD, CONVST, BUSY) for interfacing to microcontrollers, DSPs, or FPGAs, as documented in the TI ADS8505 datasheet.
Which package should I choose, SOIC (DW) or SSOP (DB)?
Choose the ADS8505IBDW (28-pin SOIC) when board space is less constrained and a wider lead pitch simplifies assembly or rework. Choose the ADS8505IBDBRG4 (28-pin SSOP, tape-and-reel) when a smaller footprint and automated high-volume SMT assembly are priorities. Both are specified over the industrial temperature range per TI documentation.
Are both variants RoHS compliant and lead-free?
The ADS8505IBDBRG4 carries the G4 suffix, indicating TI's lead-free/RoHS-compliant Green material set. The ADS8505IBDW is also available in RoHS-compliant ordering options; customers should verify the specific orderable part number and its environmental status on the TI product page or an authorized distributor listing before finalizing a design.