Part A
ADS8685IPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 3202 PCS
- Series
- Data Acquisition - Analog to Digital Converters (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS8685IPWR and ADS8685IPW are functionally equivalent 16-bit, 500-kSPS SAR ADCs sharing identical silicon, electrical specifications, and operational behavior; the only distinction is tape-and-reel versus tube packaging. Either part number can serve as a direct functional substitute for the other, with the selection driven solely by assembly and inventory handling preferences.
Package Type
High match
Pin Configuration
High match
Electrical Specifications
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADS8685IPW
Texas Instruments
- Lifecycle
- Active
- Stock
- 5604 PCS
- Package
- TSSOP-16
- 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 | ADS8685IPWR | ADS8685IPW | Why it matters |
|---|---|---|---|
| Package / Case | 16-TSSOP (0.173", 4.40mm Width) | 16-TSSOP (0.173", 4.40mm Width) | Both use the same TSSOP body, but the reel vs tube packaging affects assembly line handling and inventory format. |
| Packaging | Tape & Reel (TR) | Tube | Tape and reel is required for automated pick-and-place production; tubes are typically used for prototyping or low-volume manual assembly. |
| Resolution | 16 bit | 16 bit | Resolution determines the smallest measurable signal step and directly affects measurement accuracy. |
| Sampling Rate | 500 kSPS | 500 kSPS | Maximum throughput defines the highest signal frequency the ADC can reliably capture. |
| Number of Inputs / Channels | 1 single-ended | 1 single-ended | Channel count determines how many signals can be digitized without external multiplexing. |
| Input Type | Single-ended, bipolar/unipolar | Single-ended, bipolar/unipolar | Input configuration must match the sensor or signal source topology for correct conversion. |
| Supply Voltage | 5 V analog, 1.65–5 V digital | 5 V analog, 1.65–5 V digital | Supply requirements determine compatibility with the surrounding power rail design. |
| Interface | SPI | SPI | The digital interface must match the host controller's available serial bus. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Temperature range confirms suitability for industrial and harsh-environment applications. |
| Mounting Type | Surface Mount | Surface Mount | Mounting style must match the PCB assembly process and footprint. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS8685IPWR | ADS8685IPW |
|---|---|---|
| Series | - | ADS868x |
| Part Status | Active | Active |
| Number of Bits | 16 | 16 |
| Sampling Rate(Per Second) | - | 500k |
| Number of Inputs | 1 | 1 |
| Input Type | Pseudo-Differential, Single Ended | Pseudo-Differential, Single Ended |
| Data Interface | SPI | SPI |
| Configuration | PGA-S/H-ADC | PGA-S/H-ADC |
| Ratio - S / H: ADC | 1:1 | 1:1 |
| Number of A/D Converters | - | 1 |
| Architecture | SAR | SAR |
| Reference Type | External, Internal | External, Internal |
| Voltage - Supply, Analog | 5V | 4.75V ~ 5.25V |
| Voltage - Supply, Digital | 1.65V ~ 5.25V | 1.65V ~ 5.25V |
| Features | PGA | PGA |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C |
| Base Product Number | ADS8685 | - |
| Sampling Rate (Per Second) | 500k | - |
| Number of A / D Converters | 1 | - |
| Mounting Type | Surface Mount | - |
| Packaging | Cut Tape (CT), Tape & Reel (TR) | - |
Frequently asked questions
What is the difference between the ADS8685IPWR and the ADS8685IPW?
The ADS8685IPWR and ADS8685IPW are the same ADS8685 device (16-bit, 500-kSPS, single-supply SAR ADC with integrated analog front end) in the same TSSOP-16 (PW) package. The only difference is the ordering suffix: the "R" designates tape-and-reel packaging, while the non-R version is supplied in tubes. Electrical and functional specifications are identical.
Are the ADS8685IPWR and ADS8685IPW electrically and functionally identical?
Yes. Both orderable part numbers share the same die, package (PW, TSSOP-16), pinout, and datasheet specifications, including 16-bit resolution, 500-kSPS throughput, and the integrated programmable-gain analog front end. The suffix difference reflects packaging format only, not device performance.
Can the ADS8685IPWR and ADS8685IPW be used interchangeably in the same PCB design?
Yes, from a footprint and electrical standpoint. Both are the same PW (TSSOP-16) package with identical pin assignments, so a board designed for one accepts the other. The choice between them is driven by assembly method: tape-and-reel for automated pick-and-place lines versus tubes for low-volume or manual handling.
Which package do the ADS8685IPWR and ADS8685IPW use?
Both devices are supplied in the PW package, a 16-pin TSSOP. The package code "PW" appears in both orderable part numbers, confirming identical package type, body size, and lead pitch.
Why would a design choose the ADS8685IPWR instead of the ADS8685IPW?
The ADS8685IPWR is supplied in tape-and-reel, which is the standard format for high-volume automated surface-mount assembly. The ADS8685IPW in tubes is typically selected for prototyping, low-volume builds, or manual assembly where reel packaging is unnecessary.
Do the ADS8685IPWR and ADS8685IPW differ in resolution, sample rate, or analog input range?
No. Both part numbers reference the same ADS8685 datasheet specifications: 16-bit resolution, 500-kSPS maximum throughput, and an integrated analog front end with a software-programmable input range of ±10 V, ±5 V, ±2.5 V, and 0 V to 10 V on a single 5-V supply. Packaging format does not affect these parameters.
Are the ADS8685IPWR and ADS8685IPW rated for the same operating temperature range?
Yes. Both carry the "I" grade designation in the part number, indicating the industrial temperature range of -40°C to +125°C as specified in the ADS8685 datasheet. The packaging suffix does not change the temperature rating.