INA143U - 5V/us G=10 Differential Amplifier | Texas Instruments
N.º da peça: INA143U ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $4.2201 | $4,22 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
INA143U Visão geral
A difference amplifier is a specialized operational-amplifier configuration that measures IN+ relative to IN- and can reject large common-mode voltages that would overwhelm a conventional single-ended amplifier. The INA143 family integrates precision, ratio-matched resistors to implement fixed gain without external feedback components. This simplifies differential sensing in instrumentation, current measurement, and signal-conditioning circuits while reducing resistor-matching errors.
Verified headline specifications include a 5 V/us high slew rate, maximum offset voltage of 250 uV, low offset drift of 3 uV/C maximum, and gain error of 0.01%. The internal gain is selectable between G=10 and G=0.1. The low-cost design targets common-mode input operation from 0.1 V, while its high-speed behavior supports accurate reproduction of rapidly changing differential waveforms.
The INA143U uses matched internal resistor networks to convert the differential input into a single-ended output. The manufacturer notes that the networks are ratio matched but may vary by up to 20% in absolute resistance. That distinction matters: ratio matching supports gain accuracy, but the absolute value should not be treated as a precision external resistor value. Input bias-current and offset-current effects are included in certain published noise and DC specifications.
Typical uses include high-side current sensing in an industrial bus, differential sensor interfaces, analog measurement systems, power-converter feedback, and communications circuitry. Its 8-SOIC format supports conventional surface-mount assembly, although exposed-pad thermal performance is not specified in the provided data. The device operates from dual supplies described in the manufacturer materials, but a single-supply compatibility design must be verified from the complete datasheet before implementation.
When laying out this amplifier, route differential inputs as a compact, matched pair and keep them away from switching-current paths. Place its input/output decoupling capacitors close to the supply and signal pins, and verify common-mode voltage, output swing, supply polarity, and settling performance under the intended load. The INA143U is appropriate when a matched G=10 or G=0.1 network, fast slew rate, and low offset are more important than external gain programmability.
This page consolidates the verified manufacturer information, distributor availability, pricing snapshot, pin details, and application guidance for engineers comparing precision difference amplifiers. It also distinguishes verified drop-in candidates from functional alternatives, preventing unsupported substitutions.
Alternativas drop-in para INA143U — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com INA143U (mesmo formato e footprint) — diferindo em Operating Temperature Range, Package, Product Type.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
INA143U/2K5
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
INA143UA
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
INA143UAG4
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
INA143UA/2K5
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
INA2143U
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
INA143U Classificações máximas e características elétricas
| Product Type | Precision difference amplifier |
| Number of Circuits | 1 circuit |
| High Slew Rate | 5 V/us |
| Maximum Offset Voltage | 250 uV |
| Maximum Offset Voltage Drift | 3 uV/C |
| Gain | 10 V/V or 0.1 V/V |
| Gain Error | 0.01% |
| Minimum Common-Mode Input | 0.1 V |
| Internal Resistor Absolute Tolerance | plus or minus 20% |
| Bandwidth | 150 kHz |
| Faixa de temperatura de operação | -40 C to 85 C |
| Encapsulamento | 8-SOIC, 0.154 in width, 3.90 mm width |
| Tipo de montagem | Surface mount |
Configuração de pinos do INA143U
| Pino 1 | IN+ — Noninverting input |
| Pino 2 | IN- — Inverting input |
| Pino 3 | V+ — Positive supply connection |
| Pino 4 | V- — Negative supply connection |
| Pino 5 | REF1 — First reference connection |
| Pino 6 | REF2 — Second reference connection |
| Pino 7 | OUT — Amplified output |
| Pino 8 | NC — Not connected |
Aplicações típicas
INA143U é adequado para 6 aplicaçãos: High-Side Current Sensing, Industrial Sensor Interfacing, Balanced Audio Input Amplification, Power-Converter Feedback, Communications Receive Chains, Precision Measurement Front Ends.
High-Side Current Sensing
The INA143U fits high-side current measurement because its difference-amplifier topology measures IN+ minus IN- while rejecting the voltage common to both shunt terminals. Its selectable gain of 10 or 0.1 allows a designer to scale either a larger or smaller shunt differential signal without external matched resistors. The verified 250 uV maximum offset and 3 uV/C maximum drift support accurate DC measurement, while 5 V/us slew rate accommodates faster current transients. Confirm the complete common-mode, output-swing, supply, and shunt-power limits against the manufacturer datasheet before implementation.
Recomendado
Industrial Sensor Interfacing
The INA143U is suitable for bridge, pressure, and other differential sensors where a useful signal is buried beneath a larger common-mode voltage. Its integrated ratio-matched resistor network implements a fixed gain of 10 or 0.1 and avoids the external resistor-matching burden of a discrete difference amplifier. The 0.01% specified gain error and 250 uV maximum offset establish useful precision, although sensor calibration may still be required. Keep sensor traces short, matched, and away from motor, relay, and switching-converter return currents to preserve differential signal integrity.
Recomendado
Balanced Audio Input Amplification
The INA143U can process balanced audio or line-level inputs where rejecting common-mode voltage is more important than accepting a single-ended signal directly. Its difference-amplifier configuration produces a single-ended output from two input nodes, while gain of 0.1 can attenuate comparatively large differential voltages. The 5 V/us slew rate supports changing waveforms, but the verified 150 kHz bandwidth indicates a design optimized below audio-bandwidth-class devices. Validate signal amplitude, output headroom, distortion, noise, and stable reference bias before using it in precision audio paths.
Recomendado
Power-Converter Feedback
The INA143U can sense a differential feedback voltage across a power-converter sense pair and scale it to a single-ended control signal. Its precision resistor network and selectable 10 or 0.1 gain help reduce gain-calibration complexity, while high slew rate supports dynamic feedback-node changes. In switching systems, however, the input network can be exposed to fast common-mode transitions, so trace geometry and filtering are as important as nominal gain accuracy. Check the complete input common-mode range and output settling behavior against the converter operating envelope.
Recomendado
Communications Receive Chains
The INA143U is applicable to communications receive chains that present a differential signal with substantial common-mode content, particularly where 5 V/us slew rate is required. Its selectable gain allows attenuation or amplification before a downstream converter or comparator. The verified 150 kHz bandwidth supports certain low- and mid-frequency signaling tasks but does not imply suitability for high-rate RF or multi-gigabit links. Use short differential routing, controlled reference voltage, suitable decoupling, and bandwidth analysis to prevent filtering or ringing from degrading received data.
Recomendado
Precision Measurement Front Ends
The INA143U works as the analog front end for compact laboratory or industrial measurement systems that compare two voltages rather than measuring either one relative to ground. Maximum offset of 250 uV, offset drift of 3 uV/C, and gain error of 0.01% provide a defined starting point for measurement uncertainty. For best results, use an appropriate output reference, decouple both supply rails, avoid placing high-current returns beside the inputs, and calibrate gain and offset over the intended temperature range. The 5 V/us speed also supports faster settling than the 150 kHz small-signal bandwidth alone might suggest.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para INA143U — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | INA143U/2K5 | INA143UA | INA143UAG4 | INA2143U |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC | 8-SOIC |
| Function | Precision difference amplifier | Precision difference amplifier | Precision difference amplifier | Precision difference amplifier | Precision difference amplifier |
| Drop-In Status | Original target device | TI identifies as active drop-in replacement with upgraded functionality | Equivalent profile reported; validate exact ordering suffix | Same-family candidate; validate qualification and ordering details | Specifications stated as the same as INA143U |
Principais diferenciais
- Matched precision gain settings simplify differential front ends (vs INA143UA)
- Manufacturer-designated active drop-in path (vs INA143U/2K5)
- Explicit same-specification family relationship (vs INA2143U)
Notas de projeto
Route IN+ and IN- as a close, matched differential pair and keep the pair away from shunt-current returns, switching nodes, inductors, and relay contacts. A small loop area reduces susceptibility to magnetic pickup and capacitive coupling of common-mode noise. Place input-network components directly beside the amplifier pins with no stubs, and keep the output route away from the input pair. The INA143's integrated network removes external gain resistors, but it does not remove the need for careful differential routing.
Place supply-decoupling capacitors at the amplifier rather than at a remote supply connector. Use the capacitor type, voltage rating, and placement required by the TI datasheet and stability recommendations, then verify that REF1 and REF2 connections produce the intended output bias without excessive output loading. The verified minimum common-mode input is 0.1 V, but complete input common-mode and output-swing limits were not supplied; verify them before operating near either rail.
Do not interpret the internal networks' ratio matching as a plus or minus 20% absolute accuracy claim in the wrong direction. TI states that the networks are ratio matched while their absolute resistance may vary by up to plus or minus 20%; gain accuracy primarily depends on the ratio. Also do not assume that INA149 or INA148 is a pin-compatible substitute merely because it performs differential amplification. Confirm the SOIC pin map, reference-pin use, supply limits, and gain configuration before cross-substitution.
Treat the verified 5 V/us slew rate and 150 kHz bandwidth as separate design limits. Slew rate controls large-signal response, while bandwidth controls small-signal frequency response and settling behavior. For a differential source, terminate or bias the unused input exactly as required by the application, observe source-impedance balance, and simulate the complete network. Add input filtering only after checking that its impedance does not upset the fixed internal gain network or degrade common-mode rejection.
Informações de conformidade
The supplied search results do not explicitly provide compliance declarations for INA143U. No qualification or environmental status was inferred from its operating-temperature range.
