Part A
ADS131M08IPBSR
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 3300 個数
- Package
- TQFP-32
- Series
- データ取得 - アナログ/デジタルコンバータ (ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS131M08IPBSR is a viable functional replacement candidate for the ADS131A04IPBS in many multi-channel simultaneous-sampling data acquisition designs, provided the higher channel count, wider input range, and different digital interface are validated against the target system requirements. The shared TQFP-32 footprint and comparable supply architecture support evaluation, but the differing resolution, channel count, and SPI mode behavior require bench verification before production adoption.
Channel Count
Validation required
Resolution
Validation required
Package Type
High match
Digital Interface
Validation required
Parts at a glance
Part B
ADS131A04IPBS
STマイクロエレクトロニクス
- Lifecycle
- Active
- Stock
- 6302 個数
- Package
- TQFP-32
- Series
- データ取得 - アナログフロントエンド (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 | ADS131A04IPBS | ADS131M08IPBSR | Why it matters |
|---|---|---|---|
| Number of ADC channels | 4 | 8 | Channel count determines how many independent analog signals can be sampled simultaneously, directly affecting system architecture and whether the part can replace the other in multi-phase or multi-sensor designs. |
| Resolution | 24 bit | 24 bit | Both provide 24-bit delta-sigma conversion, so measurement precision and dynamic range are comparable, which is important for energy metering and precision sensing applications. |
| Maximum sample rate (per channel) | 128 kSPS | 32 kSPS | Sample rate limits the bandwidth of signals that can be captured; a higher rate supports faster transient capture and higher-frequency content, affecting suitability for power quality and harmonic analysis. |
| Data interface | SPI (with additional frame-sync/async modes) | SPI | The digital interface must match the host MCU/DSP; differences in protocol modes and timing can require firmware or hardware changes when substituting parts. |
| Analog supply voltage (AVDD) | 3.0 V to 3.6 V (single 3.3 V typical) | 2.7 V to 3.6 V | Supply range affects compatibility with the system power rail and input signal swing; a wider range offers more flexibility in low-voltage designs. |
| Digital supply voltage (DVDD) | 1.8 V to 3.6 V | 1.8 V to 3.6 V | DVDD must match the logic level of the host interface; identical ranges mean both parts can interface to the same MCU I/O voltage without level shifting. |
| Package | 32-pin TQFP (PBS) | 32-pin TQFP (PBS) | Package and pinout determine PCB footprint compatibility; matching packages simplify board rework but pin functions must still be verified for true drop-in substitution. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +125 °C | Industrial temperature range ensures reliable operation in harsh environments; identical ratings mean both meet the same environmental requirements. |
| Internal reference | Integrated 2.442 V reference | Integrated 1.2 V reference | The internal reference sets the full-scale input range and gain calibration; different reference voltages change the input span and require recalibration when swapping parts. |
| Programmable gain amplifier (PGA) gain range | 1 to 128 (binary steps) | 1 to 128 (binary steps) | PGA gain range determines the smallest signal that can be resolved; matching ranges mean similar low-level sensitivity for shunt and sensor inputs. |
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 | ADS131A04IPBS |
|---|---|---|
| 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 ~ 5.5V |
| Voltage - Supply, Digital | 2.7V ~ 3.6V | 1.65V ~ 3.6V |
| Features | PGA, Simultaneous Sampling | - |
| Operating Temperature | -40°C ~ 125°C | - |
| Number of Channels | - | 4 |
| Mounting Type | - | Surface Mount |
Frequently asked questions
What are the key architectural differences between the ADS131A04IPBS and ADS131M08IPBSR?
The ADS131A04IPBS is a 4-channel, simultaneous-sampling, 24-bit delta-sigma ADC with a maximum data rate of 128 kSPS and an SPI-compatible interface. The ADS131M08IPBSR is an 8-channel, simultaneous-sampling, 24-bit delta-sigma ADC with a maximum data rate of 32 kSPS and an SPI-compatible interface. The ADS131A04IPBS is specified for a supply range of 3.0 V to 3.6 V (AVDD) and 1.8 V to 3.6 V (DVDD), while the ADS131M08IPBSR operates from a 2.7 V to 3.6 V analog supply and a 1.8 V to 3.6 V digital supply, per the respective Texas Instruments datasheets.
Are the ADS131A04IPBS and ADS131M08IPBSR pin-to-pin compatible?
No. Both devices are offered in a 32-pin TQFP (PBS) package, but the pin functions differ because the ADS131A04IPBS provides 4 analog input channels while the ADS131M08IPBSR provides 8 analog input channels. The additional channel inputs and associated pin assignments on the ADS131M08IPBSR mean the two devices are not direct drop-in replacements; the PCB layout and pin connections must be reviewed against each device's datasheet pinout.
Can the ADS131A04IPBS and ADS131M08IPBSR share the same SPI interface configuration?
Both devices use an SPI-compatible serial interface for register access and data readout, but the frame format and register maps are device-specific. The ADS131A04IPBS supports a fixed 24-bit or 32-bit data word format with CRC and hamming code options, while the ADS131M08IPBSR uses its own register map and word length configuration. Firmware must be written per the respective datasheet and cannot be assumed to be interchangeable without modification.
How do the maximum data rates of the ADS131A04IPBS and ADS131M08IPBSR compare?
The ADS131A04IPBS supports a maximum data rate of 128 kSPS per channel, whereas the ADS131M08IPBSR supports a maximum data rate of 32 kSPS per channel, according to the Texas Instruments datasheets. Designs requiring higher per-channel throughput should account for this difference when selecting between the two devices.
What are the typical applications for each device?
The ADS131A04IPBS, with its 4 channels and higher 128 kSPS data rate, is suited to applications such as power metering, protection relays, and industrial monitoring where fewer channels at higher sample rates are needed. The ADS131M08IPBSR, with 8 channels, is suited to multi-channel energy metering, power quality analysis, and multi-phase monitoring where channel count is prioritized over maximum sample rate. These application fits follow from the channel count and data-rate specifications in the respective datasheets.
Do both devices support the same analog supply voltage range?
No. The ADS131A04IPBS specifies an analog supply (AVDD) range of 3.0 V to 3.6 V, while the ADS131M08IPBSR specifies an analog supply range of 2.7 V to 3.6 V, per the Texas Instruments datasheets. Both support a digital supply (DVDD) range of 1.8 V to 3.6 V. System power design should be verified against the specific device selected.
Are both devices available in the same package type?
Yes. Both the ADS131A04IPBS and ADS131M08IPBSR are offered in a 32-pin TQFP package (suffix PBS), as indicated by their respective part numbers and Texas Instruments documentation. However, identical package type does not imply identical pinout or footprint compatibility, so the pin assignments must be checked individually.