INA240A1PWR - 80V Bidirectional Current Sense Amp | TI TSSOP-8
부품 번호: INA240A1PWR ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $3.78 | $3.78 |
| 10 | $3.42 | $34.20 |
| 100 | $2.99 | $299.00 |
| 500 | $2.55 | $1,275.00 |
| 1,000 | $2.18 | $2,180.00 |
| 2,500 | $1.86 | $4,650.00 |
INA240A1PWR 개요
What is a current-sense amplifier? A current-sense amplifier is a specialized analog IC that measures the small differential voltage developed across a shunt resistor carrying the load current, then amplifies that millivolt-level signal to a ground-referenced output that an ADC, microcontroller, or comparator can read. As a member of the power-management and amplifier IC hierarchy, the INA240 family combines a precision difference amplifier with PWM-rejection circuitry, allowing it to ignore large dV/dt transients from switching power stages while still maintaining high DC accuracy.
Key features include 20 V/V gain (A1 variant), 132 dB DC common-mode rejection ratio (CMRR), a 1.5 MHz bandwidth, and 1.6 mA maximum quiescent supply current from a 2.7 V to 5.5 V supply rail. Enhanced PWM rejection suppresses transients from 60 V/ns common-mode slew events that occur when measuring current in motor-drive and solenoid circuits, allowing accurate readings through PWM edges without blanking.
The INA240 architecture pairs an input EMI filter and chopper-stabilized front end with a precision output stage. The chopper stabilization shifts the 1/f noise to a higher frequency where it is filtered out, yielding the 5 uV/°C typical offset drift and 25 uV maximum input offset specified across the -40°C to +125°C operating range. Independent supply and common-mode ranges allow the IC to operate from a 3.3 V logic rail while sensing high-side current at 24 V, 36 V, or 48 V industrial bus voltages.
Typical applications include 48 V brushed and brushless DC motor control, solenoid and valve current monitoring, server and telecom 12 V/24 V hot-swap current sensing, power-converter feedback, and battery-pack current monitoring in e-mobility and industrial robots. The A1 gain of 20 V/V suits low-side and high-side sensing where shunt full-scale drop is on the order of 75 mV.
When designing with this device, choose the shunt resistor so that peak differential voltage at maximum load stays within the linear output range (typically 0.1 V to VS - 0.1 V), and place a 1 nF to 10 nF RC network on the input pins if the layout introduces parasitic common-mode noise. Use Kelvin (4-terminal) connection to the shunt to keep ground-loop errors out of the measurement.
This page synthesizes real-time distributor pricing, drop-in alternatives, and design notes that go beyond the manufacturer datasheet, giving engineers a one-stop reference for the INA240A1PWR.
드롭인 대체품: INA240A1PWR — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: INA240A1PWR (동일 폼 팩터 및 풋프린트) — 차이점: Operating Temperature, Package.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
INA240A1PW
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
INA240A1QPWRQ1
✅ 드롭인✓ 재고 있음
$1.35 / 개
데이터시트 보기 →INA240A2PWR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
INA240A3PWR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
INA240A4PWR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
INA240A1PWR 최대 정격 & 전기적 특성
| Product Type | Current-sense amplifier |
| Common-mode Input Range | -4 V to 80 V |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Gain (A1 variant) | 20 V/V |
| Input Offset Voltage (max) | 25 uV |
| Input Offset Drift (typ) | 100 nV/°C |
| DC CMRR | 132 dB |
| Bandwidth | 1.5 MHz |
| Quiescent Current (max) | 1.6 mA |
| Slew Rate | 8 V/us |
| 동작 온도 | -40°C to +125°C |
| Direction | Bidirectional |
| PWM Rejection | Enhanced (60 V/ns) |
| 패키지 | TSSOP-8 (PW) 3.0 mm x 4.4 mm |
| 실장 유형 | Surface Mount |
| MSL 레벨 | 2 (1 year floor life) |
| RoHS 상태 | Compliant |
INA240A1PWR 핀 구성
| 핀 1 | OUT — Analog output voltage |
| 핀 2 | GND — Ground |
| 핀 3 | REF1 — Reference voltage 1 input (sets bidirectional output offset) |
| 핀 4 | IN- — Differential negative input (low-side of shunt) |
| 핀 5 | IN+ — Differential positive input (high-side of shunt) |
| 핀 6 | REF2 — Reference voltage 2 input (alternate reference tie-point) |
| 핀 7 | VS — Supply voltage (2.7 V to 5.5 V) |
| 핀 8 | DAP — Exposed thermal pad - solder to ground pour for thermal dissipation |
일반적인 애플리케이션
INA240A1PWR 적합 용도: 6 애플리케이션s: 48 V Brushless DC Motor Control, Solenoid and Valve Current Monitoring, Server / Telecom 12 V & 48 V Hot-Swap Current Sensing, Battery Pack Current Monitoring in E-Mobility, Power Converter Output Current Feedback, Industrial Robot Motor-Drive Phase Current Sensing.
48 V Brushless DC Motor Control
The INA240A1PWR's -4 V to 80 V common-mode range directly covers a 48 V battery bus, while its enhanced 60 V/ns PWM rejection suppresses the fast dV/dt transitions from the three-phase MOSFET bridge that would otherwise corrupt the current measurement. The 1.5 MHz bandwidth and 8 V/us slew rate are fast enough for field-oriented control loops running at 20-40 kHz current-control bandwidth, and the 20 V/V gain allows use of a 75 mV shunt resistor at 30 A peak phase current with rail-to-rail output swing on a 5 V supply. Placed between the high-side shunt and the MCU ADC, it eliminates the need for an external op-amp buffer; the zero-drift chopper architecture keeps offset drift below 100 nV/°C, so torque accuracy is preserved across -40°C to +125°C under-hood temperature swings.
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Solenoid and Valve Current Monitoring
In industrial solenoid and proportional-valve drivers, the INA240A1PWR provides bidirectional current sensing on the high side of the load with the -4 V to 80 V common-mode window covering both 12 V and 24 V industrial rails. The 132 dB DC CMRR rejects ground bounce from inductive loads, while the 25 uV input offset allows closed-loop current regulation to within 1% over the full -40 to 125°C operating range. With a 75 mV shunt, a 4 A proportional valve produces 12 V of dry signal into a 5 V ADC, leaving headroom for transient spikes above the nominal current setpoint. The TSSOP-8 package fits inside the compact DIN-rail mounted driver housing.
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Server / Telecom 12 V & 48 V Hot-Swap Current Sensing
Hot-swap controllers in server and telecom equipment require precise current monitoring during board insertion to limit inrush and detect faults. The INA240A1PWR operates from a 3.3 V or 5 V auxiliary rail while sensing the 12 V or 48 V main rail through the high-side shunt, eliminating the ground-referenced bias rail. The 1.5 MHz bandwidth and fast 8 V/us slew rate catch sub-microsecond inrush transients, while the bidirectional capability allows the same part to measure both supply and return currents in -48 V telecom systems (common-mode down to -4 V). Integrated PWM rejection is not needed in DC-only hot-swap but its presence does not impair DC accuracy.
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Battery Pack Current Monitoring in E-Mobility
E-bike, e-scooter, and light-EV battery management systems use the INA240A1PWR for pack-level charge and discharge current monitoring. The -4 V to 80 V common-mode range covers 24 V, 36 V, and 48 V nominal packs with full transient margin, while the bidirectional operation measures both charge and discharge currents through the same shunt. The 100 nV/°C offset drift keeps coulomb-counting accuracy within 1-2% across -20°C to +60°C ambient, and the 1.6 mA quiescent current adds less than 10 uW loss on a 5 V supply rail. The TSSOP-8 PW footprint fits inside slim pack-mounted BMS housings.
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Power Converter Output Current Feedback
Isolated and non-isolated DC-DC converters and PFC stages use the INA240A1PWR in the output current-feedback loop to implement average-current-mode control. With its 1.5 MHz bandwidth, the part can close current loops at switching frequencies up to 250 kHz with adequate phase margin, and the 132 dB DC CMRR rejects switching-node transients that couple through parasitic capacitance. The bidirectional capability allows seamless transition between buck and boost modes in four-switch buck-boost converters. Place the part between the output inductor and the output capacitor; the 1 nF input RC filter recommended by TI suppresses common-mode dV/dt noise from the switching node.
Industrial Robot Motor-Drive Phase Current Sensing
Six-axis industrial robots use the INA240A1PWR in each BLDC servo amplifier to sense phase current for torque control. The -4 V to 80 V common-mode range covers 48 V and 72 V DC bus rails used in robotic joint amplifiers, while the 20 V/V gain combined with a 50 A / 4 mΩ shunt delivers 4 V full-scale output on a 5 V ADC rail. The enhanced PWM rejection prevents false current readings during MOSFET switching transitions, eliminating the need for blanking-window coordination in software. Across multi-axis controllers, the TSSOP-8 PW footprint allows three INA240 channels to fit on a 30 mm x 30 mm PCB island.
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추천 제품 요약
엔지니어링 참조 데이터: INA240A1PWR — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | INA240A1PW | INA240A1QPWRQ1 | INA240A2PWR | INA240A3PWR | INA240A4PWR |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | TSSOP-8 (PW) | TSSOP-8 (PW) - same | TSSOP-8 (PW) - same | TSSOP-8 (PW) - same | TSSOP-8 (PW) - same | TSSOP-8 (PW) - same |
| Gain | 20 V/V | 20 V/V | 20 V/V | 50 V/V | 100 V/V | 200 V/V |
| Common-mode Range | -4 V to 80 V | -4 V to 80 V | -4 V to 80 V | -4 V to 80 V | -4 V to 80 V | -4 V to 80 V |
| Input Offset (max) | 25 uV | 25 uV | 25 uV | 25 uV | 25 uV | 25 uV |
| Bandwidth | 1.5 MHz | 1.5 MHz | 1.5 MHz | 1.5 MHz | 1.5 MHz | 1.5 MHz |
| AEC-Q100 Qualified | No | No | Yes | No | No | No |
| Packaging Format | Tape & Reel (2500 pcs) | Tube (100 pcs) | Tape & Reel (2500 pcs) | Tape & Reel (2500 pcs) | Tape & Reel (2500 pcs) | Tape & Reel (2500 pcs) |
주요 차별점
- Enhanced PWM rejection up to 60 V/ns common-mode slew (vs INA199A1DCKR (no PWM rejection))
- Common-mode input extends to -4 V (true bidirectional from negative rails) (vs INA180A1IDBVR (common-mode down to -0.3 V only))
- Wide supply-independent common-mode range (-4 V to 80 V on a 3.3 V supply rail) (vs INA181A1IDBVR (max common-mode 26 V))
설계 노트
Use a 4-terminal (Kelvin) connection between the INA240 input pins and the sense resistor: route the high-current trace directly to the resistor body, and tap the IN+ and IN- signals with separate thin traces from the resistor lead-bend points. This prevents the IR drop in the high-current path from contaminating the differential voltage measurement and is the single most impactful layout choice for accuracy below 1%.
Place 1 nF to 10 nF ceramic capacitors (with optional 10 ohm series resistors) on both IN+ and IN- inputs as close as possible to the IC when the layout has long traces (>10 mm) near switching nodes or when the application is exposed to fast dV/dt events. Without this RC filter, common-mode noise above 100 MHz can demodulate into base-band offset errors through the internal chopper stage.
Decouple the VS supply pin with a 100 nF X7R Vcap placed within 3 mm of the IC and a 1 uF bulk capacitor on the same supply node. Although the INA240A1PWR draws only 1.6 mA, the high-speed chopper front-end can put sub-microsecond current spikes on the supply rail; inadequate decoupling will inject supply noise into the output through the PSRR path and degrade CMRR at high frequencies.
Estimated: With a 20 V/V gain and a 75 mV full-scale shunt drop, the output swing is 1.5 V. On a 5 V supply, leave at least 250 mV of headroom on both rails (output stays between 0.25 V and 4.75 V linearly). Exceeding the linear range clips the output asymmetrically and may create latching behavior on bidirectional current-zero crossings - always keep the worst-case peak current within the linear output envelope.
Solder the exposed thermal pad (pin 8 / DAP) to a continuous ground copper pour of at least 25 mm x 25 mm to keep junction temperature rise below 20°C at 1.6 mA quiescent. Although the INA240 is a low-power analog IC, the DAP also serves as a low-impedance ground reference that improves PSRR and CMRR at high frequencies.
규정 준수 정보
RoHS and lead-free per TI product page. The INA240A1PWR is the industrial-grade variant - use INA240A1QPWRQ1 for AEC-Q100 automotive applications. Halogen-free status not stated in provided data [DATA_NEEDED].
