INA240A1D - 20V/V Bidirectional Current Sense Amp | TI
部品番号: INA240A1D ✓ 生産中INA240A1D 概要
A current-sense amplifier is a specialized instrumentation amplifier that converts the small differential voltage across a current shunt into a larger, easier-to-process voltage. The INA240 family belongs to the amplifier hierarchy as a current-sense amplifier, instrumentation amplifier, analog IC, and semiconductor. Its common-mode range allows the shunt to remain near a supply rail while high voltage, high current, or both are present in the monitored circuit.
The INA240A1D combines a 20 V/V gain setting with bidirectional operation and enhanced PWM rejection. Zero-drift architecture minimizes output drift as temperature changes, while the -4 V to 80 V common-mode range supports demanding industrial power systems. Its analog output can be centered near ground for bidirectional current measurement by applying the appropriate reference configuration. The device also supports unidirectional sensing when both reference pins are tied to ground.
Internally, the device provides precision differential sensing, a low-offset amplifier, and an analog output stage. Because the common-mode input range is independent of the supply voltage in the relevant operating region, the INA240 can sense voltage drops across a high-side shunt without requiring the amplifier supply to exceed the sensed bus voltage. This architecture is particularly useful when PWM switching nodes create large common-mode transients.
Typical applications include motor-control systems, industrial power supplies, robotics, solar inverters, battery packs, solenoid drivers, LED drivers, and protected DC power rails. The INA240A1D is especially appropriate when current must be measured bidirectionally, the shunt may sit above ground, and PWM rejection is important. A 20 V/V gain also reduces the required shunt resistance when the measured current range is relatively low.
When designing the circuit, verify that the shunt power dissipation remains below its rating and that the amplifier output stays within its valid output range at maximum load current. Place the differential input traces directly across the shunt, keep them short and symmetric, and provide stable supply decoupling close to the device. Do not exceed the absolute maximum ratings for supply voltage, common-mode voltage, or input voltage.
This page combines manufacturer specifications, drop-in alternatives, application guidance, and practical design notes for engineers evaluating the INA240A1D in motor, industrial, and high-side current-measurement systems.
ドロップイン代替品: INA240A1D — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: INA240A1D （同一形状・フットプリント） — 相違点: Operating Temperature Range.
INA240A1DRG4
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA240A1EDRQ1
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA240A1DR
✅ ドロップイン📋 参考代替品（カタログ未掲載）
INA240A3D
✅ ドロップイン ⚠️ 仕様未検証価格はお問い合わせください
データシートを見る →INA240A4D
✅ ドロップイン ⚠️ 仕様未検証価格はお問い合わせください
データシートを見る →INA240A1D 最大定格＆電気的特性
| Product Type | Bidirectional current-sense amplifier |
| Gain | 20 V/V |
| Common-Mode Voltage Range | -4 V to 80 V |
| 電源電圧 | 5.5 V |
| Input Offset Voltage | 25 uV maximum |
| Offset Drift | Zero-drift architecture |
| PWM Rejection | Enhanced |
| 動作温度範囲 | -40 C to 125 C |
| パッケージ | 8-pin SOIC (D) |
| ピン数 | 8 pins |
| 実装タイプ | Surface mount |
INA240A1D 8-pin soic (d) ピン配置ガイド
INA240A1D (8-pin soic (d) パッケージ) のピン配置。 このアナログコンポーネントは、入力、出力、および電源ピンを備えています。オフセットナル、補償、イネーブルピンの設定については、メーカーのデータシートを参照してください。信号調整やアンプ回路に最適です。
詳細なピン配置データはありません: INA240A1D.
詳細は データシート をご参照ください。
主な用途
INA240A1D の用途: 6 件s: Brushless DC Motor Control, Industrial Power-Supply Feedback, Solenoid and Relay Monitoring, Solar Inverter and Battery Current Sensing, Robotics and Actuator Control, LED Driver Load Monitoring.
Brushless DC Motor Control
The INA240A1D is well suited to closed-loop DC motor control because its 20 V/V gain converts a small shunt differential into a useful analog control signal, while its -4 V to 80 V common-mode range handles elevated motor buses. Place the shunt in the motor return or supply path and route the differential inputs directly across it. The enhanced PWM rejection helps prevent switching-node transitions from corrupting the current signal during commutation. Designers should size the shunt for the maximum phase current and verify that the analog output remains within its valid range at both positive and negative current extremes.
おすすめ
Industrial Power-Supply Feedback
The INA240A1D can provide precise current feedback in industrial power supplies where a high-side shunt may operate at a substantial common-mode voltage. Its 20 V/V gain improves sensitivity to small shunt drops, while the 80 V upper common-mode limit accommodates many 24 V, 48 V, and 60 V power architectures. The amplifier is particularly useful when the feedback node can move because of load changes or fault transients. Keep the input pair tightly routed across the shunt, avoid sharing sensitive traces with motor or switching-node wiring, and confirm that the output can represent the complete programmed current range without saturation.
おすすめ
Solenoid and Relay Monitoring
The INA240A1D is appropriate for measuring current through solenoid, relay, and electromagnetic actuator drivers where short-duration inrush current must be captured accurately. Bidirectional operation supports both energization and current-decay monitoring, while the broad common-mode range permits placement near a switching supply rail. The 20 V/V gain allows a relatively small shunt voltage to produce a measurable analog output for control or protection circuitry. Use suitable transient protection for inductive loads, verify amplifier input limits against switching transients, and calculate the shunt dissipation at the maximum coil current before fixing the resistance value.
おすすめ
Solar Inverter and Battery Current Sensing
The INA240A1D supports current measurement in solar inverters, battery-management systems, and energy-storage equipment where bus voltages can vary widely and current may flow in either direction. The -4 V to 80 V common-mode range supports high-side sensing, and the bidirectional output allows charge and discharge currents to be distinguished around a midpoint reference. Its 20 V/V gain improves resolution for relatively low-current shunts. Place the amplifier close to the shunt, use a shielded or tightly routed differential layout, and establish the reference network so charging and discharging currents fit within the output-voltage headroom.
おすすめ
Robotics and Actuator Control
The INA240A1D is useful in robotic drives and actuator controllers that need dependable feedback from motors, grippers, or powered joints. A 20 V/V gain reduces the signal-conditioning burden when the shunt drop is small, and the enhanced PWM rejection improves measurement integrity in systems where motor current is switched at high frequency. The device can monitor current in either direction, which is valuable during braking or regenerative behavior. Route the IN+ and IN- connections as a short differential pair directly across the shunt, maintain symmetry between the paths, and check the output against the controller ADC range before enabling the power stage.
おすすめ
LED Driver Load Monitoring
The INA240A1D can monitor LED-driver output current when the design requires a linear analog measurement instead of relying only on a controller's internal average. Its 20 V/V gain provides useful signal amplitude from a small series shunt, while the extended common-mode range allows placement near a high-voltage LED bus. Bidirectional reference options can support topology-specific current direction or startup behavior. The shunt should be selected for both continuous dissipation and the driver's peak pulse current. In layout, keep the shunt and differential amplifier path compact, connect the reference network according to the required output origin, and ensure the analog output remains valid during minimum-load conditions.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: INA240A1D — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | INA240A1DRG4 | INA240A1EDRQ1 | INA240A1DR | INA240A3D | INA240A4D |
|---|---|---|---|---|---|---|
| Package | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 (D) | SOIC-8 (D) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | Bidirectional zero-drift current-sense amplifier | Current-sense amplifier | Automotive-qualified current-sense amplifier | Zero-drift current-sense amplifier | Current-sense amplifier | Current-sense amplifier |
| PWM Rejection | Enhanced | Enhanced | Enhanced | Enhanced | Enhanced | Enhanced |
主な差別化要因
- A1 gain retains 20 V/V current sensitivity （vs INA240A3D)
- Wide common-mode range supports elevated power buses （vs INA188IDR)
- Enhanced PWM rejection for switching power paths （vs INA188IDR)
- Automotive-qualified family option （vs INA240A1D)
設計ノート
Route IN+ and IN- as a short, tightly coupled differential pair directly across the shunt. Keep the pair away from switching nodes, power inductors, and high-current return paths to minimize induced measurement error. Place the input and bypass components close to the corresponding INA240A1D pins, use the shortest practical ground return, and connect the two input traces symmetrically to the shunt pads.
Estimated: shunt dissipation equals current squared multiplied by shunt resistance. A 5 A current through a 5 milliohm shunt dissipates 0.125 W, while 10 A through the same shunt dissipates 0.5 W. Select a shunt resistance that provides useful amplifier output while keeping both continuous and pulse power below the shunt's rating. Also verify that the amplifier output remains within its valid swing at maximum load current.
Configure REF1 and REF2 according to the required current direction. For unidirectional sensing, the cross-reference material identifies grounding the reference pins as one configuration; for bidirectional sensing, use a low-impedance midpoint reference sized so the maximum positive and negative currents remain within the output range. Decouple the 5.5 V supply locally and avoid allowing reference-node transients to couple into the differential inputs.
Do not confuse the 80 V common-mode rating with an 80 V supply rating for the amplifier. The INA240A1D itself uses a 5.5 V supply, and its inputs must remain within their own absolute-maximum limits during faults. In high-side sensing, account for shunt-divider input behavior, switching transients, and the tolerance of the reference network before applying the maximum intended bus voltage.
コンプライアンス情報
The automotive-qualified INA240A1EDRQ1 is identified as the automotive-qualified family alternative, while the standard INA240A1D is not described as AEC-Q100 qualified. Other compliance declarations require confirmation from the manufacturer product documentation.
