INA2133U - Dual 1.5MHz Precision Difference Amplifier | TI
N.º da peça: INA2133U ✓ AtivoINA2133U Visão geral
A difference amplifier is an analog signal-conditioning IC that subtracts two input voltages and amplifies the resulting differential component. In the broader electronics hierarchy, it belongs to the instrumentation-amplifier family, which sits within precision analog amplifiers, analog ICs, and semiconductors. Such devices are commonly used to reject common-mode interference, amplify sensor outputs, and preserve signal integrity between sensors and analog-to-digital converters.
The INA2133U provides two precision difference amplifiers in one 14-pin SOIC package. Its 1.5 MHz bandwidth supports signal acquisition beyond very slow sensor applications, while the 450 µV maximum offset specification limits input-referred error during low-level measurements. The low 0.95 mA power figure also makes it relevant to compact industrial, communications, and test equipment where each milliampere affects thermal and power-budget requirements. According to the Texas Instruments product page, the device is designed for high-speed precision differential signal conditioning.
Internally, the INA2133 combines a precision operational-amplifier core with an on-chip, laser-trimmed resistor network. The manufacturer describes the INA133 and INA2133 families as unity-gain difference amplifiers using high-slew-rate precision operational amplifiers. Laser trimming improves resistor matching and gain accuracy, while matched resistor temperature coefficients help preserve common-mode rejection and gain accuracy over temperature. The dual-channel implementation reduces package count when two independent differential measurements are required.
Typical uses include current-sense and low-voltage bridge measurements, industrial sensor interfaces, communications-line signal conditioning, precision test equipment, and differential inputs to data converters. The 1.5 MHz bandwidth is particularly useful when the measured differential signal must be captured without the long settling delays associated with lower-bandwidth instrumentation amplifiers. The 450 µV offset specification should nevertheless be evaluated against the smallest signal amplitude that the application expects to measure.
When designing around the INA2133U, check input common-mode range, output swing, supply voltage, gain configuration, and the input/output network required by the selected operating mode. Place the device close to the signal source, maintain short differential traces, and use a quiet return path so that connector or routing noise does not degrade the differential measurement. Decoupling capacitors should be positioned at the supply pins according to the manufacturer application guidance.
This page combines the verified manufacturer specifications, current distributor availability, same-family drop-in options, application guidance, and practical design notes. It also distinguishes verified INA2133U characteristics from parameters that still require confirmation from the complete manufacturer datasheet or application-specific calculations.
Alternativas drop-in para INA2133U — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
INA2133A
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
INA2133U Classificações máximas e características elétricas
| Number of Channels | 2 channels |
| Amplifier Type | Unity-gain precision difference amplifier |
| Gain | 1 V/V |
| Bandwidth | 1.5 MHz |
| Maximum Offset Voltage | 450 µV |
| Maximum Offset Voltage Drift | 5 µV/°C |
| Maximum Gain Error | 0.05% |
| Corrente de alimentação | 0.95 mA |
| Faixa de temperatura de operação | -55 °C to +125 °C |
| Encapsulamento | 14-pin SOIC (D) |
| Status RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | not_applicable |
Guia de Configuração de Pinos do INA2133U 14-pin soic (d)
Configuração de pinos para INA2133U (pacote 14-pin soic (d)). Este componente analógico possui pinos de entrada, saída e alimentação. Consulte o datasheet do fabricante para configurações de offset null, compensação e pino de enable. Ideal para circuitos de condicionamento de sinal e amplificadores.
Nenhum dado detalhado de pinagem disponível para INA2133U.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
INA2133U é adequado para 6 aplicaçãos: Industrial Sensor Signal Conditioning, Precision Bridge Measurement, Communications Differential Input, Current-Shunt Measurement, Test and Measurement Front End, Data Converter Front End.
Industrial Sensor Signal Conditioning
The INA2133U fits industrial sensor front ends that measure a small differential output in the presence of a larger common-mode voltage. Its dual 1.5 MHz channels allow two transducers to share one package, while the 450 µV maximum offset limits input-referred error and the 0.05% maximum gain error supports accurate scaling. Place the device near the sensor interface, keep input traces short and symmetrical, and confirm that the measured common-mode and output ranges remain inside the limits in the complete Texas Instruments data sheet. The -55 °C to +125 °C rated version is suitable for many harsh industrial environments, although every system still requires separate EMC protection and sensor-specific calibration.
Recomendado
Precision Bridge Measurement
A resistive bridge produces a small differential signal around a substantial midpoint voltage, making common-mode rejection central to accuracy. The INA2133U is suitable for this task because its unity-gain topology and laser-trimmed resistor network are specified for gain accuracy and common-mode rejection. The 1.5 MHz bandwidth can capture bridge events without the settling limitations of much slower instrumentation amplifiers. Use a regulated bridge excitation, confirm the amplifier's input common-mode range under excitation and temperature extremes, and avoid relying on offset specifications that have not been tied to the actual gain configuration. Calibration can further remove residual gain, offset, and sensor non-linearity errors from the measured result.
Recomendado
Communications Differential Input
The INA2133U can condition low-level differential inputs in communications equipment when the designer needs more bandwidth than a slow precision instrumentation amplifier. Its 1.5 MHz bandwidth is useful for extracting a small differential signal from a larger common-mode component, while the 0.95 mA power figure can simplify thermal budgets in compact line-card designs. Layout remains decisive: keep the two input paths symmetric, provide a solid ground reference, and place local supply decoupling at the device. The amplifier must not be treated as a complete communications front end; protection, filtering, gain control, and any required line-driver functions remain separate design stages.
Recomendado
Current-Shunt Measurement
The INA2133U is appropriate for measuring the voltage across a low-value current shunt when the amplifier input can accept the resulting common-mode voltage. Its 450 µV maximum offset is relevant because it acts directly on a millivolt-level shunt signal, while unity gain avoids adding an unnecessary gain stage that could increase noise. The two channels can monitor two shunts or provide a differential diagnostic measurement. Confirm shunt excitation, common-mode limits, output swing, and settling behavior against the complete data sheet. High-current layouts also require Kelvin connections and careful attention to copper resistance so that the amplifier measures the intended shunt voltage rather than unwanted PCB drops.
Recomendado
Test and Measurement Front End
The dual INA2133U supports compact bench-instrument and automated test front ends that need accurate differential inputs without a large instrumentation-amplifier package. The 1.5 MHz bandwidth provides useful responsiveness for many source-measurement signals, and the dual channel arrangement can reduce board area. Its 450 µV maximum offset remains the dominant error term for microvolt- or millivolt-level measurements, so the input source impedance and measurement bandwidth should be reviewed carefully. Keep sensitive traces away from switching regulators and digital clocks, use short ground returns, and apply calibration records when absolute measurement accuracy is required.
Recomendado
Data Converter Front End
The INA2133U can drive an analog-to-digital converter when a differential sensor signal requires amplification and common-mode rejection before sampling. Its 1.5 MHz bandwidth supports faster settling than many precision instrumentation amplifiers, while the low 0.95 mA supply figure helps limit amplifier-generated heat in compact systems. The design must verify the converter's input range against the INA2133U output swing, account for the required anti-alias filter, and establish whether the converter's sampling rate needs additional bandwidth. Place the amplifier and its local decoupling close to the converter, use a quiet analog supply where possible, and test settling behavior with the actual source impedance and filter values.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para INA2133U — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | INA2133A |
|---|---|---|
| Package | 14-pin SOIC (D) | 14-pin SOIC (D), subject to current ordering-table verification |
| Brand | Texas Instruments | Texas Instruments |
| Channel Count | 2 channels | 2 channels |
| Amplifier Type | Unity-gain precision difference amplifier | INA2133-family precision difference amplifier |
| Bandwidth | 1.5 MHz | 1.5 MHz for the INA2133 family |
| Maximum Offset Voltage | 450 µV | 450 µV for the INA2133 family |
| Maximum Gain Error | 0.05% | 0.05% for the INA2133 family |
| Supply Current | 0.95 mA | 0.95 mA for the INA2133 family |
Principais diferenciais
- Dual precision difference channels in one package (vs INA2133A)
- 1.5 MHz signal bandwidth (vs INA2133A)
- Low 0.95 mA power consumption (vs INA2133A)
Notas de projeto
Route the two inputs of each INA2133U channel as a tightly coupled differential pair, with matched spacing and a continuous ground reference beneath the pair. Place the amplifier close to the sensor or shunt, and keep the shunt measurement path short enough that parasitic resistance does not become part of the sensed voltage. For high-current shunts, use dedicated Kelvin sense traces rather than routing through shared power copper.
Verify the operating common-mode voltage before connecting the input. A difference amplifier rejects common-mode voltage only while both inputs remain inside its permitted input range; excessive common-mode voltage can cause saturation even when the differential signal is small. Also account for the 450 µV maximum offset when setting the minimum measurable signal, and confirm that the selected supply voltage supports the required output swing.
Place local supply-decoupling capacitors next to the INA2133U supply and ground connections, following the manufacturer application circuit. Because the verified device power figure is approximately 0.95 mA, its own dissipation is usually modest, but nearby switching nodes and inductors can inject noise into a precision measurement. A quiet analog supply branch and effective source grounding are often more valuable than adding excessive bulk capacitance.
Informações de conformidade
The supplied manufacturer and distributor excerpts do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The INA2133U is an analog instrumentation amplifier, so AEC-Q100 is recorded as not applicable.