INA154U - 3MHz High-Speed Difference Amplifier | Texas Instruments
N.º de pieza: INA154U ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
INA154U Descripción general
A difference amplifier is a specialized operational-amplifier circuit that subtracts one input voltage from another while rejecting common-mode voltage. In signal-chain terms, the INA154U belongs to the instrumentation-amplifier and differential-input amplifier hierarchy: differential amplifier -> precision analog amplifier -> analog signal-conditioning IC -> semiconductor. Its integrated precision resistor network provides the fixed difference function without requiring four external matched resistors.
Verified features include a maximum input offset voltage of ±750 µV, maximum offset drift of ±2 µV/°C, maximum gain error of ±0.05%, and wide bandwidth of 3 MHz. These parameters make the device suitable where differential signal extraction, bridge measurement, current measurement, or sensing of small voltage differences is required. The manufacturer describes the amplifier as high-speed and precision, while the verified search results identify an 8-SOIC package and one amplifier circuit per device.
The INA154U is intended for low-cost designs rather than being described as an ultra-low-noise or high-voltage instrumentation amplifier. Its performance should be evaluated against the actual signal amplitude, source impedance, common-mode range, supply voltage, bandwidth, and required accuracy. The reference pin and input common-mode limits are important when selecting external protection, filtering, and bias circuitry. The verified manufacturer datasheet is the authoritative source for electrical limits and pin functions.
Typical uses include differential sensor interfaces, balanced audio and communications signal paths, bridge amplifiers, ADC input conditioning, and precision current-shunt measurements. In a typical application, the two inputs are connected to the sensed differential pair and the output presents the scaled difference. Input and output filtering can be added to control bandwidth, suppress switching noise, and protect the amplifier from transients.
When laying out the circuit, keep the differential input traces short and matched, connect the reference pin to a low-impedance bias reference when required, and place input filtering close to the amplifier pins. The integrated resistor network's tolerance and temperature drift should be included in the system error budget. This page combines verified manufacturer specifications, source traceability, application guidance, and replacement constraints for practical design review.
Alternativas directas para INA154U — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con INA154U (mismo factor de forma y huella) — difiere en Bandwidth, Product Type.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
INA154UA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
INA154UG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
INA157UG4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
INA157UA
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
INA155U/2K5G4
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
INA154U Valores máximos y características eléctricas
| Product Type | High-speed, precision difference amplifier (G = 1) |
| Number of Channels | 1 circuit |
| Gain | 1 |
| Bandwidth | 3 MHz |
| Input Offset Voltage | ±750 µV maximum |
| Input Offset Drift | ±2 µV/°C |
| Gain Error | ±0.05% maximum |
| Slew Rate | 14 V/µs typical |
| Common-Mode Rejection Ratio | 80 dB minimum |
| Corriente en reposo | 2.4 mA typical |
| Input Common-Mode Range | -25 V to +25 V |
| Rango de temperatura de funcionamiento | -40°C to +85°C |
| Encapsulado | 8-pin SOIC |
| Tipo de montaje | Surface mount |
| Input Resistor Network | Integrated precision resistor network; resistor absolute tolerance is ±20% |
| Estado RoHS | unknown |
| REACH Status | unknown |
| AEC-Q100 Qualification | unknown |
Configuración de pines de INA154U
| Pin 1 | 1 — Pin function is [DATA_NEEDED: INA154U pin 1 function] |
| Pin 2 | 2 — Pin function is [DATA_NEEDED: INA154U pin 2 function] |
| Pin 3 | 3 — Pin function is [DATA_NEEDED: INA154U pin 3 function] |
| Pin 4 | 4 — Pin function is [DATA_NEEDED: INA154U pin 4 function] |
| Pin 5 | 5 — Pin function is [DATA_NEEDED: INA154U pin 5 function] |
| Pin 6 | 6 — Pin function is [DATA_NEEDED: INA154U pin 6 function] |
| Pin 7 | 7 — Pin function is [DATA_NEEDED: INA154U pin 7 function] |
| Pin 8 | 8 — Pin function is [DATA_NEEDED: INA154U pin 8 function] |
Aplicaciones típicas
INA154U es adecuado para 6 aplicacións: Bridge Sensor Signal Conditioning, Current-Shunt Measurement, Balanced Audio Input, ADC Input Conditioning, Industrial Differential Sensing, Communications Receive Front End.
Bridge Sensor Signal Conditioning
The INA154U fits bridge sensing when the design needs a unity-gain differential output and moderate analog bandwidth. Its verified maximum offset voltage of ±750 µV, offset drift of ±2 µV/°C, gain error of ±0.05%, and CMRR of at least 80 dB provide a defined starting point for bridge error analysis. Place the device close to the bridge and ADC, keep the two input routes short, and include the bridge excitation, input impedance, and wiring mismatch in the noise budget. The 3 MHz bandwidth is much faster than many sensor signals, but filtering can be added to limit noise without changing the fixed unity-gain function.
Recomendado
Current-Shunt Measurement
Use the INA154U as a unity-gain differential receiver when a current shunt produces a small voltage proportional to load current. The fixed gain avoids an external resistor network, while the verified 80 dB minimum CMRR helps reject supply and ground disturbances that affect both shunt terminals. Its ±750 µV maximum offset and ±2 µV/°C drift must be included when determining the smallest measurable current. A Kelvin connection, matched input routing, and local analog filtering are important because parasitic resistance and unequal traces can add error comparable to the shunt voltage.
Recomendado
Balanced Audio Input
The INA154U is appropriate for balanced audio or communications inputs when the goal is unity-gain differential extraction rather than additional analog gain. Its 3 MHz bandwidth and 14 V/µs typical slew rate provide useful headroom for many audio-band signals, while the fixed gain simplifies the input stage. The verified CMRR of at least 80 dB is particularly relevant when both conductors carry a common-mode signal. Confirm that the input common-mode range of -25 V to +25 V covers the actual signal, add appropriate input protection, and use balanced routing to prevent the differential amplifier from converting ground or cable noise into output error.
Recomendado
ADC Input Conditioning
The INA154U can condition a bipolar differential signal before conversion by an ADC, provided the signal, common-mode voltage, and supply rails satisfy its limits. Its unity gain reduces the need for an external gain-setting network, while the 3 MHz bandwidth is adequate for many multiplexed measurement and communication channels. The ±750 µV offset and ±2 µV/°C drift contribute to the ADC's input-referred error budget. Place anti-alias filtering ahead of or around the amplifier, check ADC acquisition requirements, and verify that the amplifier can settle before the ADC sampling aperture.
Recomendado
Industrial Differential Sensing
The INA154U is suitable for industrial systems that monitor a differential voltage generated by sensors, transducers, or isolated interface circuitry. Its specified -40°C to +85°C operating range and surface-mount SOIC package support compact analog front ends, but temperature drift must be included in long-term accuracy calculations. The verified 2.4 mA typical quiescent current helps when several analog channels share a power budget. For factory equipment, place the amplifier near the sensor connector, use guarded or grounded differential routing, and add surge protection that does not degrade the specified input common-mode range.
Recomendado
Communications Receive Front End
The INA154U can provide unity-gain differential receive conditioning for communications links where the two input conductors carry a useful differential signal and unwanted common-mode voltage. Its 3 MHz bandwidth and 14 V/µs typical slew rate make it relevant for moderate-rate data and analog communication front ends. The 80 dB minimum CMRR helps reject shared line noise, but cable imbalance and connector transitions can still create differential errors. Check the -25 V to +25 V input common-mode range, terminate the line correctly, and place filtering close to the pins while observing the datasheet's stability and output-drive requirements.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para INA154U — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | INA154UA | INA154UG4 | INA157UG4 | INA157UA | INA155U/2K5G4 |
|---|---|---|---|---|---|---|
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Function | Difference amplifier, G = 1 | Difference amplifier, G = 1 | Difference amplifier | Related difference-amplifier alternative | Related difference-amplifier alternative | Related amplifier alternative |
Diferenciadores clave
- Fixed unity-gain difference function (frente a INA155U/2K5G4)
- Verified bandwidth and slew-rate positioning (frente a INA154UG4)
- Integrated precision resistor network (frente a Generic external-resistor difference amplifier)
Notas de diseño
Do not treat the INA154U as a universal instrumentation amplifier. Its fixed gain is 1, and the verified input common-mode range is -25 V to +25 V. Before connecting a sensor or communications line, verify the absolute input voltage, differential input voltage, supply rails, and fault transients. The provided cross-reference data does not establish complete pin compatibility for every related INA15x part, so verify the exact replacement datasheet before substituting.
Route the two differential inputs as short, matched traces directly from the source or protection network to the INA154U. Keep the reference connection low impedance and place input filtering near the amplifier pins. Because the device is a precision difference amplifier, source imbalance and unequal trace resistance can create differential error; use symmetrical routing and a stable ground reference in industrial and communications systems.
The verified bandwidth is 3 MHz and the typical slew rate is 14 V/µs. Use those values to select amplifier settling time, anti-alias filtering, ADC acquisition timing, and cable termination. Do not assume that the listed bandwidth alone guarantees acceptable large-signal behavior; verify output drive, load, supply headroom, and the datasheet stability conditions. Place filtering where it will not add unnecessary parasitic capacitance or mismatch.
The verified comparison data lists typical quiescent current as 2.4 mA. For a preliminary supply estimate, use the actual quiescent current plus output load current and the required voltage-drop and dissipation margin; these calculations are estimates until the complete datasheet operating conditions are applied. Check supply rails against the input common-mode range and ensure the output remains within the load and swing limits.
Información de cumplimiento
The supplied verified sources identify the manufacturer and product but do not explicitly state compliance status for INA154U. Regulatory and quality claims should be confirmed against the current Texas Instruments documentation for the exact orderable MPN.