Part A
ADS1271IBPWR
Texas Instruments
- Lifecycle
- Active
- Stock
- 6728 PCS
- Package
- TSSOP-16
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (ADC)
Replacement verdict
Not a drop-in replacement
The ADS1271IBPWR and ADS1286UB/2K5 are not drop-in replacements for one another. They differ in resolution, architecture, sample rate, and package, so substituting one for the other requires a full redesign of the surrounding signal chain and layout rather than a direct swap.
Different resolution
Different architecture
Different sample rate
Different package
Parts at a glance
Part B
ADS1286UB/2K5
Texas Instruments
- Lifecycle
- Active
- Stock
- 8439 PCS
- Package
- SOIC-8
- Series
- Acquisição de dados - Analogo para Convertedores Digitais (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 | ADS1271IBPWR | ADS1286UB/2K5 | Why it matters |
|---|---|---|---|
| Resolution (bits) | 24 | 12 | Resolution determines the smallest signal change the ADC can distinguish; a 24-bit converter offers far finer quantization than a 12-bit one, so they are not functionally interchangeable for high-dynamic-range measurements. |
| Architecture | Delta-Sigma | SAR | Delta-sigma and SAR architectures differ fundamentally in noise shaping, latency, and oversampling behavior, affecting suitability for precision DC versus fast multiplexed acquisition. |
| Sample Rate (max) | 105 kSPS | 20 kSPS | Maximum throughput limits how fast signals can be digitized; the higher-rate part supports wider-bandwidth or faster-cycling applications. |
| Input Type | Differential | Single-ended | Differential inputs reject common-mode noise and improve accuracy in noisy environments, while single-ended inputs simplify wiring but are more susceptible to ground noise. |
| Supply Voltage | 5 V (analog), 1.8 V to 3.3 V (digital) | 5 V | Supply requirements determine power-rail compatibility; the dual-supply device allows low-voltage digital interfacing while the single-supply device needs a 5 V rail. |
| Interface | SPI (serial) | SPI (serial) | Both use a serial SPI interface, so host-side protocol compatibility is similar, though timing and frame formats must still be verified. |
| Package | TSSOP-16 | SOIC-8 | Package footprint and pin count affect PCB layout and drop-in compatibility; different packages require board redesign. |
| Operating Temperature Range | -40 °C to +105 °C | -40 °C to +85 °C | The wider temperature range of one part supports harsher industrial environments where the other may exceed its rated limits. |
| Power Consumption (typical) | ~70 mW | ~2.5 mW | Power dissipation impacts thermal design and battery life; the SAR device is far more power-efficient, which matters for portable or low-power systems. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADS1271IBPWR | ADS1286UB/2K5 |
|---|---|---|
| Supplier | - | Texas Instruments |
| Part Status | Active | Obsolete |
| Number of Bits | 24 | 12 |
| Sampling Rate(Per Second) | 105k | 20k |
| Number of Inputs | 1 | 1 |
| Input Type | Differential | Differential |
| Data Interface | SPI | SPI |
| Configuration | ADC | S/H-ADC |
| Ratio - S / H: ADC | - | 1:1 |
| Number of A/D Converters | 1 | 1 |
| Architecture | Sigma-Delta | SAR |
| Reference Type | External | External |
| Voltage - Supply, Analog | 5V | 5V |
| Voltage - Supply, Digital | 1.65V ~ 3.6V | 5V |
| Operating Temperature | -40°C ~ 105°C | -40°C ~ 85°C |
Frequently asked questions
What are the primary differences between the ADS1271IBPWR and the ADS1286UB/2K5?
The ADS1271IBPWR is a 24-bit, 105 kSPS delta-sigma ADC with a wide analog supply range (4.75 V to 5.25 V) and a digital supply range of 1.65 V to 3.6 V, housed in a TSSOP-16 package. The ADS1286UB/2K5 is a 12-bit, 200 kSPS successive-approximation register (SAR) ADC with a 5 V single supply, housed in a SOIC-8 package. They differ in resolution, architecture, sampling rate, supply requirements, and package footprint.
Are the ADS1271IBPWR and ADS1286UB/2K5 pin-to-pin or package compatible?
No. The ADS1271IBPWR uses a TSSOP-16 package, while the ADS1286UB/2K5 uses a SOIC-8 package. The pin counts, pin functions, and PCB land patterns are different, so they are not directly interchangeable without a board redesign.
Can the ADS1271IBPWR and ADS1286UB/2K5 be used in the same application interchangeably?
No. The ADS1271IBPWR offers 24-bit resolution at up to 105 kSPS with a delta-sigma architecture, suitable for high-resolution precision measurement. The ADS1286UB/2K5 offers 12-bit resolution at up to 200 kSPS with a SAR architecture, suitable for faster, lower-resolution conversions. Their resolution, speed, and interface characteristics differ, so they target different application requirements.
What are the supply voltage requirements for each device?
The ADS1271IBPWR requires an analog supply (AVDD) of 4.75 V to 5.25 V and a digital supply (DVDD) of 1.65 V to 3.6 V. The ADS1286UB/2K5 operates from a single 5 V supply. Designs must account for these different supply configurations.
How do the sampling rates and resolution of the two ADCs compare?
The ADS1271IBPWR provides 24-bit resolution with a maximum data rate of 105 kSPS. The ADS1286UB/2K5 provides 12-bit resolution with a maximum sampling rate of 200 kSPS. The ADS1271IBPWR prioritizes resolution, while the ADS1286UB/2K5 prioritizes speed.
Do the ADS1271IBPWR and ADS1286UB/2K5 use the same digital interface?
No. The ADS1271IBPWR provides a serial interface (SPI-compatible) for data output. The ADS1286UB/2K5 also provides a serial interface, but the frame format, word length, and timing differ due to the different resolution and architecture. Firmware and interface logic must be adapted accordingly.
What are the typical application differences between the ADS1271IBPWR and ADS1286UB/2K5?
The ADS1271IBPWR is typically used in high-resolution precision measurement applications such as industrial process control, weigh scales, and medical instrumentation. The ADS1286UB/2K5 is typically used in faster, lower-resolution applications such as data acquisition systems, motor control, and general-purpose monitoring where 12-bit resolution is sufficient.