Part A
ADS131A02IPBS
Texas Instruments
- Lifecycle
- Active
- Stock
- 7625 PCS
- Package
- TQFP-32
- Series
- Acquisição de dados - Front End analógico (AFE)
Replacement verdict
Compatible functional replacement candidate
The ADS131A02IPBS is a functional replacement candidate for the ADS131A04IPBSR, sharing the same package, pinout, supply architecture, and SPI interface, but with half the channel count. Designers must confirm that two channels satisfy the application's simultaneous-sampling requirements before substituting.
Package and Pinout
High match
Channel Count
Not compatible
Resolution and Data Rate
High match
Supply and Interface
High match
Parts at a glance
Part B
ADS131A04IPBSR
Texas Instruments
- Lifecycle
- Active
- Stock
- 3693 PCS
- Package
- TQFP-32
- Series
- Acquisição de dados - Front End analógico (AFE)
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADS131A04IPBSR | ADS131A02IPBS | Why it matters |
|---|---|---|---|
| Number of ADC channels | 4 | 2 | Determines how many independent analog signals can be sampled simultaneously; a direct functional substitutability constraint. |
| Resolution | 24 bit | 24 bit | Sets the measurement precision and dynamic range; identical resolution means comparable accuracy per channel. |
| Maximum sample rate | 128 kSPS | 128 kSPS | Defines the highest signal bandwidth that can be captured; matching rates support equivalent timing performance. |
| Supply voltage (analog) | 3.0 V to 3.6 V | 3.0 V to 3.6 V | Must match the system power rail; identical analog supply range allows drop-in power compatibility. |
| Interface type | SPI | SPI | Determines host communication compatibility; same interface simplifies firmware and hardware reuse. |
| Package | 32-TQFP (5x5) | 32-TQFP (5x5) | Affects PCB footprint and assembly; identical package enables direct board-level substitution. |
| Operating temperature range | -40°C to +125°C | -40°C to +105°C | Defines environmental robustness; the wider range of the four-channel device may be required in harsh applications. |
| Typical power consumption | Higher (4 channels active) | Lower (2 channels active) | Impacts thermal budget and energy use; fewer active channels reduce total power draw in the two-channel variant. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS131A02IPBS | ADS131A04IPBSR |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Number of Channels | 2 | 4 |
| Power (Watts) | 2.6 mW | - |
| Voltage - Supply, Analog | 3V ~ 3.45V | 3V ~ 5.5V |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | 1.65V ~ 3.6V |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the key differences between the ADS131A04IPBSR and the ADS131A02IPBS?
The primary difference is the number of analog input channels: the ADS131A04IPBSR is a 4-channel simultaneous-sampling 24-bit delta-sigma ADC, while the ADS131A02IPBS is a 2-channel version of the same family. Both share the same TQFP-32 (PBS) package, SPI interface, internal reference, and similar analog front-end architecture, but the A04 provides two additional differential input channels.
Are the ADS131A04IPBSR and ADS131A02IPBS pin-compatible?
Both devices are offered in the same 32-pin TQFP (PBS) package, but they are not fully pin-compatible because the additional input channels on the ADS131A04IPBSR occupy pins that are unused or assigned differently on the ADS131A02IPBS. A direct drop-in replacement should not be assumed; the PCB layout and pin assignments must be verified against the respective datasheets.
Do both devices support simultaneous sampling of all channels?
Yes. Both the ADS131A04IPBSR and ADS131A02IPBS use simultaneous-sampling delta-sigma architectures, meaning all available input channels (four on the A04, two on the A02) are sampled at the same instant. This makes both suitable for multi-phase power metering and protection applications where channel-to-channel phase relationship must be preserved.
What is the resolution and data rate of these ADCs?
Both devices are 24-bit delta-sigma ADCs. The ADS131A04IPBSR and ADS131A02IPBS support programmable data rates up to 128 kSPS per channel, with flexible oversampling ratio (OSR) settings that allow trade-offs between resolution and throughput. Exact data rate and noise performance figures should be confirmed in the respective TI datasheets.
Can the ADS131A02IPBS be used as a lower-cost alternative to the ADS131A04IPBSR?
Yes, when the application requires only two analog input channels, the ADS131A02IPBS can serve as a lower-cost alternative within the same product family. However, because the channel count and pin assignments differ, the design must be re-validated for layout, firmware channel mapping, and system calibration before substituting one for the other.
Do both parts share the same digital interface and supply requirements?
Yes. Both the ADS131A04IPBSR and ADS131A02IPBS use an SPI-compatible serial interface and are designed for the same analog and digital supply rails within the ADS131A family. Firmware command sets and register maps are largely shared, though channel-specific registers differ due to the different channel counts. Confirm exact supply voltage ranges and interface timing in the TI datasheets.
Which applications typically use the ADS131A04IPBSR versus the ADS131A02IPBS?
The ADS131A04IPBSR is typically used in three-phase power metering, protection relays, and energy monitoring where four simultaneous channels are needed. The ADS131A02IPBS is suited to single-phase metering, two-channel sensor acquisition, and space- or cost-constrained designs that require only two simultaneous input channels.