Part A
ADS131M08IPBS
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 6440 PCS
- Package
- TQFP-32
- Series
- 데이터 수집 - 아날로그 변환기(ADC)
Replacement verdict
Compatible functional replacement candidate
The ADS131M08IPBS is a viable functional upgrade candidate for the ADS131A02IPBS in multi-channel, high-resolution delta-sigma acquisition designs, but it is not a pin-compatible drop-in. The ADS131M08IPBS offers eight channels versus two, a wider analog supply range, and a higher maximum data rate, while both share the same TQFP-32 footprint and SPI interface. Designers must re-validate channel count, supply headroom, and timing margins before substituting.
Channel Count
Validation required
Package Type
High match
Digital Interface
High match
Analog Supply Range
Validation required
Parts at a glance
Part B
ADS131A02IPBS
텍사스 인스트루먼트(주)
- Lifecycle
- Active
- Stock
- 7625 PCS
- Package
- TQFP-32
- Series
- 데이터 수집 - 아날로그 프런트엔드(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 | ADS131M08IPBS | 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 systems. |
| Resolution | 24 bit | 24 bit | Both provide 24-bit delta-sigma conversion, so dynamic range and precision class are equivalent for high-accuracy metering applications. |
| Maximum sample rate (per channel) | 128 kSPS | 32 kSPS | Higher per-channel throughput supports faster control loops and wider signal bandwidth; the lower-rate device may be insufficient for high-speed sampling requirements. |
| Data interface | SPI (with additional frame/DRDY control) | SPI | Interface protocol and framing differences affect firmware and host MCU compatibility, so a drop-in replacement may require software changes. |
| Supply voltage (analog) | 3.0 V to 3.6 V (single 3.3 V supply) | 2.7 V to 3.6 V (analog) | Supply range compatibility ensures the part operates correctly on the existing rail; a narrower range may limit operation at lower voltages. |
| Package | 32-pin TQFP (PBS) | 32-pin TQFP (PBS) | Identical package and pin count simplify PCB layout reuse, though pinout differences must still be verified for direct substitution. |
| Operating temperature range | -40 °C to +125 °C | -40 °C to +125 °C | Matching industrial temperature ranges confirm both parts are suitable for the same harsh-environment applications. |
| Integrated PGA / gain stages | Yes (programmable gain) | Yes (programmable gain) | On-chip gain allows direct connection of low-amplitude sensors without external amplification, preserving signal chain simplicity in both parts. |
| Typical application focus | 2-channel energy metering / power monitoring | 8-channel energy metering / multi-phase power monitoring | The intended application scope indicates whether the device fits single-phase versus multi-phase or multi-sensor designs, affecting functional substitutability. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS131M08IPBS | 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 ADS131M08IPBS?
The ADS131A02IPBS is a 2-channel, simultaneous-sampling, 24-bit delta-sigma ADC with a maximum data rate of 128 kSPS per channel. The ADS131M08IPBS is an 8-channel, simultaneous-sampling, 24-bit delta-sigma ADC with a maximum data rate of 32 kSPS per channel. Both are offered in a TQFP-32 package and operate from an analog supply of 3.0 V to 3.6 V, but they differ in channel count, maximum data rate, and power consumption.
Are the ADS131A02IPBS and ADS131M08IPBS pin-compatible?
No. Although both devices are packaged in a 32-pin TQFP (PBS) package, they are not pin-compatible. The ADS131A02IPBS uses its pins for two analog input channels plus dedicated SYNC, RESET, and clock pins, while the ADS131M08IPBS routes eight analog input channels and additional digital control pins. A direct drop-in replacement is not possible without PCB redesign and validation against the respective datasheets.
How do the maximum data rates of the ADS131A02IPBS and ADS131M08IPBS compare?
The ADS131A02IPBS supports a maximum data rate of 128 kSPS per channel in high-resolution mode. The ADS131M08IPBS supports a maximum data rate of 32 kSPS per channel. Designs requiring higher per-channel throughput should select the ADS131A02IPBS, while the ADS131M08IPBS is intended for multi-channel applications where channel count is prioritized over sample rate.
What are the typical applications for each device?
The ADS131A02IPBS is typically used in power metering, protection relays, and industrial equipment requiring two high-resolution simultaneous-sampling channels at higher data rates. The ADS131M08IPBS is typically used in multi-phase power monitoring, energy meters, and data acquisition systems that require eight simultaneous-sampling channels. Selection depends on channel count, sample rate, and system-level accuracy requirements.
Do both devices support the same digital interface?
Both devices provide an SPI-compatible serial interface for configuration and data readout. However, the register maps, command sets, and frame formats differ between the ADS131A02IPBS and ADS131M08IPBS. Firmware written for one device cannot be reused on the other without modification and revalidation against the respective datasheet.
How does power consumption compare between the ADS131A02IPBS and ADS131M08IPBS?
Power consumption scales with channel count and data rate. The ADS131A02IPBS, with two channels at up to 128 kSPS, and the ADS131M08IPBS, with eight channels at up to 32 kSPS, have different typical supply currents as specified in their respective datasheets. Designers should consult the manufacturer datasheets for exact typical and maximum current values under the intended operating conditions rather than assuming equivalence.
Can the ADS131M08IPBS replace the ADS131A02IPBS in an existing design?
Not directly. The ADS131M08IPBS offers more channels but a lower maximum data rate and a different pinout and register map. Replacing the ADS131A02IPBS with the ADS131M08IPBS requires PCB layout changes, firmware updates, and revalidation of accuracy, timing, and power budgets against the target system requirements.