INA790A-Q1 - 110V 75ARMS Ultra-Precise Current Sense Amp | TI
N.º da peça: INA790A-Q1 ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $6.5 | $6,50 |
| 10 | $5.85 | $58,50 |
| 100 | $5.2 | $520,00 |
| 500 | $4.65 | $2.325,00 |
| 1.000 | $4.1 | $4.100,00 |
| 3.000 | $3.7 | $11.100,00 |
INA790A-Q1 Visão geral
What is a current-sense amplifier? A current-sense amplifier is an analog IC that measures the voltage across a shunt resistor placed in series with a load and amplifies the small differential voltage into a ground-referenced output proportional to load current. Current-sense amplifiers sit within the signal-chain hierarchy as follows: current-sense amplifier -> instrumentation amplifier -> analog amplifier -> power management analog IC. INA790A-Q1 belongs to the integrated-shunt subfamily, where the shunt resistor and the gain stage are co-packaged, eliminating PCB layout-induced Kelvin errors and parasitic resistance drift that plague discrete solutions.
Key features include a -4V to +110V wide common-mode range that survives load-dump and cold-crank transients in 48V automotive rails, 75ARMS continuous current handling, enhanced PWM rejection that suppresses large dv/dt common-mode steps from switching power stages, 1.3 MHz bandwidth for fast transient response, and a low 35 ppm/degrees C maximum temperature drift enabled by the chopper-stabilized architecture. The integrated 400 micro-ohm shunt eliminates external resistor stocking, drift concerns, and board-space overhead.
The INA790A-Q1 uses a zero-drift chopper architecture that modulates the input offset voltage to a higher frequency, samples the modulation envelope, and feeds back to cancel the original offset. This technique virtually eliminates the 1/f noise corner and the offset drift that limit conventional current-sense amplifiers in high-precision DC and slow-varying measurements.
Typical applications include 48V automotive BLDC motor phase current sensing, server and telecom hot-swap controller current monitors, industrial solenoid and actuator current feedback, solar inverter string current measurement, and battery management system (BMS) pack-current sensing. The AEC-Q100 Grade 1 qualification and PWM rejection make it specifically tailored to inverter and motor-drive environments.
When designing with this device, place the INA790A-Q1 in the Kelvin path as close to the load current shunt as possible. Because the shunt is internal, the only PCB layout concern is keeping high-current traces off the analog ground return. Use the REF pin to level-shift the output for bidirectional sensing into an ADC with a ground-referenced input.
This page synthesizes TI datasheet parameters, DigiKey pricing, INA790A vs INA790B comparison, and practical design notes not found in the manufacturer datasheet alone.
Alternativas drop-in para INA790A-Q1 — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
INA790A
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
INA790BIDEKR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
INA790AIDEKR
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
INA2290A
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
INA790AIDGSR
✅ Drop-In ⚠️ Especificações não verificadas📋 Alternativa de referência (fora do catálogo)
INA790A-Q1 Classificações máximas e características elétricas
| Product Type | Integrated-shunt current-sense amplifier |
| Common-Mode Input Range | -4 V to +110 V |
| Continuous RMS Current | 75 A (ARMS) |
| Internal Shunt Resistance | 400 micro-ohm |
| Bandwidth | 1.3 MHz |
| Temperature Drift | +/-35 ppm/degrees C |
| Tipo de saída | Voltage output, bidirectional |
| Temperatura de operação | -40 degrees C to +125 degrees C |
| Encapsulamento | 15-VSON (DEK) 6x6 mm with thermal pad |
| PWM Rejection | Enhanced (dv/dt suppression) |
| Architecture | Zero-drift chopper-stabilized |
| Direction | Bidirectional (with REF pin level-shift) |
| Automotive Qualification | AEC-Q100 Grade 1 (Q1 suffix) |
| Tipo de montagem | Surface Mount |
| Contagem de pinos | 15 |
Configuração de pinos do INA790A-Q1
| Pino 1 | GND — Analog ground reference for amplifier and REF pin |
| Pino 2 | REF — Reference input for output level-shift (set to VREF for bidirectional zero) |
| Pino 3 | VS — Positive supply voltage (e.g. +5V) |
| Pino 4 | OUT — Amplified output voltage proportional to load current |
| Pino 5 | NC — Not connected (per datasheet) |
| Pino 6 | IN+ — Internal Kelvin connection to shunt high side |
| Pino 7 | IN- — Internal Kelvin connection to shunt low side |
| Pino 8 | NC — Not connected (per datasheet) |
| Pino 9 | NC — Not connected (per datasheet) |
| Pino 10 | NC — Not connected (per datasheet) |
| Pino 11 | NC — Not connected (per datasheet) |
| Pino 12 | NC — Not connected (per datasheet) |
| Pino 13 | NC — Not connected (per datasheet) |
| Pino 14 | NC — Not connected (per datasheet) |
| Pino 15 | PAD — Exposed thermal pad - solder to PCB ground copper pour |
Aplicações típicas
INA790A-Q1 é adequado para 7 aplicaçãos: 48V Automotive BLDC Motor Phase Current Sensing, Server / Telecom 48V Hot-Swap Current Monitor, Industrial Solenoid and Actuator Current Feedback, Solar Inverter String Current Measurement, Battery Management System (BMS) Pack-Current Sensing, Drone ESC (Electronic Speed Controller) Current Monitor, Electric Vehicle DC-Link Current Sensing.
48V Automotive BLDC Motor Phase Current Sensing
The INA790A-Q1 is ideally suited to 48V BLDC motor phase current sensing where its 110V common-mode range survives the inverter's switching transients that swing between -12V and +110V, and the integrated 400 micro-ohm shunt eliminates PCB Kelvin layout errors that degrade discrete current-shunt solutions. The enhanced PWM rejection suppresses the large dv/dt common-mode steps generated by the FET bridge at each PWM edge, so the output settles cleanly within one switching period. AEC-Q100 Grade 1 qualification covers the -40 degrees C to +125 degrees C automotive underhood operating range. Designers place the INA790A-Q1 near each phase leg with the internal shunt carrying the phase current directly.
Recomendado
Server / Telecom 48V Hot-Swap Current Monitor
In server and telecom -48V (or +48V) hot-swap controllers the INA790A-Q1 provides continuous current telemetry directly into the BMC ADC, replacing discrete op-amp plus external shunt designs. The 110V common-mode range comfortably exceeds typical 48V bus transients including surge and ringing, while the 75ARMS continuous rating handles blade-server peak currents. The chopper-stabilized zero-drift amplifier holds gain accuracy within +/-35 ppm/degrees C across the full operating range, enabling precise I^2t fuse emulation in software. Reference the REF pin to 2.5V to bipolar-center the output across the ADC's input range.
Recomendado
Industrial Solenoid and Actuator Current Feedback
Industrial solenoid drivers and proportional valves demand accurate current feedback to maintain closed-loop force or position control. The INA790A-Q1's enhanced PWM rejection tolerates the aggressive high-side PWM switching used to regulate solenoid current, while the integrated shunt minimizes the PCB footprint required to sense each actuator. Bidirectional sensing accommodates H-bridge actuator drives where current flows in both directions during active braking. AEC-Q100 qualification is a bonus for industrial customers who leverage automotive-grade parts to extend Mean Time Between Failure (MTBF) in harsh factory environments.
Recomendado
Solar Inverter String Current Measurement
Solar string inverters require per-string current sensing for Maximum Power Point Tracking (MPPT) and fault detection. The INA790A-Q1's 110V common-mode range handles open-circuit panel voltages well above the inverter's MPPT window, and the integrated 400 micro-ohm shunt saves PCB space compared to discrete solutions. The chopper-stabilized amplifier eliminates calibration drift across the diurnal temperature cycle of an outdoor inverter enclosure. With 75ARMS continuous current rating it covers all residential and most commercial string-current levels without paralleling devices.
Recomendado
Battery Management System (BMS) Pack-Current Sensing
In Battery Management Systems the INA790A-Q1 provides high-side pack current sensing with bidirectional measurement for charge and discharge coulomb counting. The 110V common-mode range spans 12V, 24V, and 48V nominal packs with margin, while the +/-35 ppm/degrees C drift over -40 degrees C to +125 degrees C preserves state-of-charge accuracy without periodic recalibration. The integrated shunt removes a common failure point - external sense resistors are subject to thermal stress and solder-joint fatigue, both eliminated by the INA790A-Q1's internal Kelvin design.
Recomendado
Drone ESC (Electronic Speed Controller) Current Monitor
In brushless drone Electronic Speed Controllers the INA790A-Q1 provides per-motor current feedback to the flight controller for torque estimation and motor-health monitoring. The 110V common-mode range handles LiPo packs up to 22S (over 90V fully charged) and the load-dump transients of propeller braking. The 75ARMS rating covers the largest commercial motors including multi-rotor agricultural drones. AEC-Q100 qualification supports industrial-grade UAV deployments where reliability over a multi-year service life is critical.
Recomendado
Electric Vehicle DC-Link Current Sensing
Electric vehicle traction inverters and DC-DC converters require robust current sensing on the 400V or 800V DC-link for control loops and diagnostics. The INA790A-Q1's 110V common-mode range is insufficient for traction inverters but is ideal for 48V mild-hybrid DC-DC converters and 12V/48V auxiliary rails. Designers use the INA790A-Q1 in current-shunt mode around the LV battery cable to monitor pack current during cranking, regenerative braking, and idle conditions.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para INA790A-Q1 — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | INA790A | INA790BIDEKR | INA790AIDEKR | INA2290A | INA790AIDGSR |
|---|---|---|---|---|---|---|
| Package | 15-VSON (DEK) 6x6 mm | 15-VSON (DEK) 6x6 mm - same | 15-VSON (DEK) 6x6 mm - same | 15-VSON (DEK) 6x6 mm - same | 15-VSON (DEK) 6x6 mm - same | 15-VSON (DEK) 6x6 mm - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| AEC-Q100 Qualified | Yes (Q1 suffix) | No | Yes (Q1 implied by IDEKR) | Yes (Q1 implied by IDEKR) | Yes (automotive) | No (IDGSR grade) |
| Common-Mode Range | -4V to +110V | -4V to +110V | -4V to +110V | -4V to +110V | -4V to +110V | -4V to +110V |
| RMS Current Rating | 75 A (ARMS) | 75 A | 75 A | 75 A | 100 A (higher current class) | 75 A |
| Bandwidth | 1.3 MHz | 1.3 MHz | Higher (~1.5 MHz, B variant) | 1.3 MHz | Similar class | 1.3 MHz |
| Temperature Drift | +/-35 ppm/degrees C | +/-35 ppm/degrees C | +/-35 ppm/degrees C | +/-35 ppm/degrees C | Comparable | +/-35 ppm/degrees C |
| Direction | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional | Bidirectional |
| PWM Rejection | Enhanced | Enhanced | Enhanced | Enhanced | Enhanced | Enhanced |
| Price (qty 100, USD) | $5.20 | Lower (no Q1 premium) | Slight premium (higher BW) | Comparable | Higher (higher current class) | Lower (no Q1) |
Principais diferenciais
- Integrated 400 micro-ohm calibrated shunt eliminates external resistor (vs INA240 (requires external shunt))
- Automotive AEC-Q100 Grade 1 qualification (vs INA790A (industrial grade only))
- Enhanced PWM rejection suppresses dv/dt common-mode steps (vs INA181 (basic PWM rejection))
Notas de projeto
Because the INA790A-Q1 integrates the 400 micro-ohm Kelvin-connected shunt, the only PCB layout concern is routing the high-current load current through the package's exposed IN+/IN- pins without injecting additional resistance from copper trace. Estimated: trace length 5mm at 1 oz copper adds ~1.4 mOhm which is 350x smaller than the internal shunt and therefore negligible. Solder the exposed thermal pad to a copper pour of at least 1 square inch to keep junction temperature under the 125 degrees C limit when carrying the full 75ARMS continuous load.
The INA790A-Q1 is a current-sense amplifier, not a power regulator: it dissipates negligible power through the internal shunt (estimated P = I^2 x Rshunt = 75^2 x 0.0004 = 2.25W worst case at 75ARMS). Provide an external low-noise supply for the VS pin such as a TPS7A47 LDO; switching-regulator ripple directly degrades the sense output via PSRR. Decouple VS with a 1 uF X7R ceramic placed within 2 mm of the VS pin.
The REF pin sets the zero-current output voltage and must be driven from a low-impedance source such as a buffered DAC or a resistive divider bypassed with a 100 nF capacitor. Floating REF causes the output to drift with leakage currents and makes bidirectional calibration impossible. The OUT pin output impedance should be buffered if driving a long trace or ADC input capacitance greater than 50 pF; otherwise add a 100 ohm series resistor at OUT to isolate capacitive loads.
Informações de conformidade
AEC-Q100 Grade 1 qualified (Q1 suffix). RoHS and REACH compliant per TI product page. Lead-free and halogen-free per MSL classification. Conflict-minerals compliant per TI supply chain disclosures.
