Part A
ADS131M08IPBSR
Техасские инструменты
- Lifecycle
- Active
- Stock
- 3300 ПКС
- Package
- TQFP-32
- Series
- Сбор данных - аналогово-цифровые преобразователи (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS131M08IPBSR is a functional replacement candidate for the ADS131A02IPBS in applications where a higher channel count and wider feature set are acceptable, but it is not a drop-in replacement due to differences in channel count, package footprint, and interface configuration. Designers must validate pinout, firmware, and layout compatibility before substitution.
Channel Count
Not compatible
Package Type
Validation required
Interface Type
Validation required
Resolution
High match
Parts at a glance
Part B
ADS131A02IPBS
Техасские инструменты
- Lifecycle
- Active
- Stock
- 7625 ПКС
- Package
- TQFP-32
- Series
- Сбор данных - аналоговый фронт-энд (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 | ADS131A02IPBS | ADS131M08IPBSR | Why it matters |
|---|---|---|---|
| Number of ADC channels | 2 | 8 | Channel count determines how many independent analog signals can be measured simultaneously; a 2-channel part cannot directly replace an 8-channel part in multi-phase or multi-sensor designs. |
| Resolution | 24 bit | 24 bit | Both provide 24-bit delta-sigma conversion, so nominal dynamic range and precision class are comparable for energy metering and industrial sensing. |
| Maximum sample rate (per channel) | 128 kSPS | 32 kSPS | Higher per-channel throughput enables wider signal bandwidth and faster control loops; the lower-rate device may not meet high-speed sampling requirements. |
| Data interface | SPI (with additional frame-sync / hardware modes) | SPI | Interface compatibility affects host MCU wiring and firmware; differing protocol options can require board and software changes. |
| Analog supply voltage (AVDD) | 3.0 V to 3.6 V | 2.7 V to 3.6 V | Supply range determines compatibility with the system rail; a narrower minimum may limit operation at lower analog supply voltages. |
| Digital supply voltage (DVDD) | 1.65 V to 3.6 V | 1.65 V to 3.6 V | Matching digital rail ranges ensures direct logic-level compatibility with the host processor without level shifting. |
| Package | 32-pin TQFP (PBS) | 32-pin TQFP (PBS) | Identical package and pin count allow the same PCB footprint, though pinout differences must still be verified before substitution. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +125 °C | Equivalent industrial temperature ratings mean both suit harsh environments without derating concerns. |
| Integrated PGA / gain stages | Yes (programmable gain) | Yes (programmable gain) | On-chip gain allows direct connection of low-amplitude sensors, reducing external signal-conditioning components in both designs. |
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 | ADS131M08IPBSR | ADS131A02IPBS |
|---|---|---|
| Part Status | Active | Active |
| Number of Bits | 24 | 24 |
| Sampling Rate(Per Second) | 32k | - |
| Number of Inputs | 8 | - |
| Input Type | Differential | - |
| Data Interface | SPI | - |
| Configuration | ADC | - |
| Ratio - S / H: ADC | 0:1 | - |
| Number of A/D Converters | 8 | - |
| Architecture | Sigma-Delta | - |
| Reference Type | Internal | - |
| Voltage - Supply, Analog | 2.7V ~ 3.6V | 3V ~ 3.45V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | 1.65V ~ 3.6V |
| Features | PGA, Simultaneous Sampling | - |
| Operating Temperature | -40°C ~ 125°C | - |
| Number of Channels | - | 2 |
| Power (Watts) | - | 2.6 mW |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the key architectural differences between the ADS131A02IPBS and the ADS131M08IPBSR?
The ADS131A02IPBS is a 2-channel, simultaneous-sampling, 24-bit delta-sigma ADC with a maximum data rate of 128 kSPS, housed in a TQFP-32 package. The ADS131M08IPBSR is an 8-channel, simultaneous-sampling, 24-bit delta-sigma ADC with a maximum data rate of 32 kSPS, housed in a TQFP-32 package. The primary differences are channel count (2 vs. 8) and maximum output data rate (128 kSPS vs. 32 kSPS).
Are the ADS131A02IPBS and ADS131M08IPBSR pin-to-pin compatible?
No. Although both devices are offered in a TQFP-32 package, they are not pin-to-pin compatible. The ADS131A02IPBS and ADS131M08IPBSR have different pin functions and assignments, so a direct PCB drop-in replacement is not possible without layout changes.
Do both devices support simultaneous sampling of all channels?
Yes. Both the ADS131A02IPBS and the ADS131M08IPBSR use simultaneous-sampling delta-sigma architectures, meaning all of their respective channels (2 for the ADS131A02IPBS and 8 for the ADS131M08IPBSR) are sampled at the same instant, which preserves phase relationships between channels.
How do the maximum data rates of the ADS131A02IPBS and ADS131M08IPBSR compare?
The ADS131A02IPBS supports a maximum data rate of 128 kSPS, while the ADS131M08IPBSR supports a maximum data rate of 32 kSPS. Designs requiring higher per-channel throughput should account for this difference when selecting between the two parts.
What is the resolution and ADC type of both devices?
Both the ADS131A02IPBS and the ADS131M08IPBSR are 24-bit delta-sigma analog-to-digital converters. They share the same resolution and converter architecture, differing primarily in channel count, data rate, and pinout.
Can the ADS131M08IPBSR replace the ADS131A02IPBS in an existing design without firmware changes?
No. Because the two devices differ in channel count, maximum data rate, and pin assignments, replacing one with the other requires both hardware (PCB layout) and firmware (register map and configuration) changes. A direct substitution without redesign is not supported.
Which device is better suited for multi-channel polyphase metering or power monitoring?
The ADS131M08IPBSR, with its 8 simultaneous-sampling channels, is better suited for multi-channel applications such as polyphase metering or multi-rail power monitoring, where more channels are needed. The ADS131A02IPBS, with only 2 channels, is more appropriate for lower-channel-count signal acquisition.
Do both devices share the same package type and manufacturer?
Yes. Both the ADS131A02IPBS and the ADS131M08IPBSR are manufactured by Texas Instruments and are offered in a TQFP-32 package. However, sharing the package type does not imply pin compatibility between the two parts.