INA950-SEP - 80V Ultra-Precise Current-Sense Amp | TI
料号： INA950-SEP ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $12.5 | $12.50 |
| 10 | $11.25 | $112.50 |
| 100 | $10 | $1,000.00 |
| 500 | $9 | $4,500.00 |
| 1,000 | $8 | $8,000.00 |
INA950-SEP 概述
A current-sense amplifier is a specialized operational amplifier that measures current by amplifying the small differential voltage across a sense resistor while rejecting the common-mode voltage. It is a key building block in power management systems, enabling accurate monitoring of load currents, battery charging, and power supply health. The INA950-SEP belongs to the family of analog current-sense amplifiers, which are essential for closed-loop control and protection in industrial, automotive, and aerospace systems.
Key features include a wide common-mode input range of 2.7V to 80V, a bandwidth of 1.1MHz, and ultra-precise gain accuracy. The device is designed for space applications, offering enhanced radiation tolerance and reliability. Its low quiescent current of 370μA minimizes power consumption, making it suitable for battery-powered and energy-harvesting systems. The TSSOP-8 package provides a compact footprint for space-constrained PCBs.
Technically, the INA950-SEP uses a precision current-sense architecture that maintains high accuracy across temperature and supply variations. The wide common-mode range allows it to monitor currents on high-voltage rails without level shifting, simplifying system design. The 1.1MHz bandwidth enables fast transient response, which is critical for detecting overcurrent conditions in real time.
Typical applications include high-side current sensing in power supplies, battery management systems, motor control, and load switches. In space applications, it is used for power monitoring in satellites and spacecraft, where reliability and precision are paramount. The device's wide common-mode range and low power consumption make it versatile for both high-voltage and low-power systems.
When designing with the INA950-SEP, ensure that the shunt resistor is placed in the high-side path and that the common-mode voltage does not exceed the absolute maximum rating. Proper PCB layout with Kelvin connections to the shunt resistor is essential to minimize parasitic resistance and maintain measurement accuracy.
直接替换替代料： INA950-SEP ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： INA950-SEP （相同外形与封装尺寸） ——差异在于 Bandwidth, Package.
快速对比工具——选择替代料号进行并排对比：
INA951-SEP
✅ 直接替换📋 参考替代料（不在目录中）
INA240A1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
INA281A1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
INA199A1
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
INA950-SEP 最大额定值与电气特性
| Common-Mode Voltage Range | 2.7 V to 80 V |
| Supply Voltage Range | 2.7 V to 5.5 V |
| 静态电流 | 370 µA (typical) |
| Bandwidth | 1.1 MHz |
| 封装 | TSSOP-8 |
| 安装类型 | Surface Mount |
| Radiation Tolerance | Space Enhanced Product (SEP) |
| RoHS 状态 | Compliant |
| Number of Channels | 1 |
| 输出类型 | Analog |
INA950-SEP 引脚配置
| 引脚 1 | IN+ — Positive input, connect to high side of shunt resistor |
| 引脚 2 | IN- — Negative input, connect to low side of shunt resistor |
| 引脚 3 | GND — Ground |
| 引脚 4 | OUT — Analog output voltage proportional to current |
| 引脚 5 | NC — No connect |
| 引脚 6 | NC — No connect |
| 引脚 7 | NC — No connect |
| 引脚 8 | VS — Supply voltage, 2.7V to 5.5V |
典型应用
INA950-SEP 适用于 6 应用s: Space Power Monitoring, High-Side Current Sensing in Industrial Power Supplies, Battery Management Systems, Motor Control, Load Switch Monitoring, Test and Measurement Equipment.
Space Power Monitoring
The INA950-SEP is designed for space applications, providing ultra-precise current sensing for satellite power systems. Its wide common-mode range (2.7V to 80V) allows monitoring of high-voltage solar array outputs and battery buses. The radiation-tolerant design ensures reliable operation in harsh space environments. With a quiescent current of only 370µA, it minimizes power loss in the spacecraft's power budget. The 1.1MHz bandwidth enables fast detection of overcurrent events, protecting critical loads. This makes it ideal for power distribution units and battery charge controllers in satellites and deep-space probes.
推荐
High-Side Current Sensing in Industrial Power Supplies
In industrial power supplies, the INA950-SEP monitors load currents on high-voltage rails (up to 80V) with high precision. Its wide common-mode range eliminates the need for level shifting, simplifying the design. The low quiescent current (370µA) reduces standby power, which is critical for energy-efficient systems. The 1.1MHz bandwidth allows real-time monitoring of dynamic loads, enabling fast overcurrent protection. The TSSOP-8 package fits compact industrial PCBs. This makes it suitable for programmable logic controllers, motor drives, and power distribution systems.
推荐
Battery Management Systems
The INA950-SEP is used in battery management systems (BMS) to monitor charge and discharge currents. Its wide common-mode range (up to 80V) accommodates high-voltage battery stacks in electric vehicles and energy storage systems. The ultra-precise measurement ensures accurate state-of-charge estimation. The low quiescent current (370µA) is essential for minimizing battery drain during standby. The 1.1MHz bandwidth enables fast detection of overcurrent conditions, protecting the battery from damage. The TSSOP-8 package is suitable for space-constrained BMS modules.
推荐
Motor Control
In motor control applications, the INA950-SEP senses phase currents in high-voltage motor drives. Its common-mode range up to 80V allows direct connection to the motor supply rail. The 1.1MHz bandwidth provides fast current feedback for precise torque control. The low quiescent current (370µA) reduces power loss in the control electronics. The ultra-precise gain ensures accurate current regulation, improving motor efficiency. The TSSOP-8 package is ideal for compact motor drivers. This makes it suitable for industrial robots, CNC machines, and electric vehicles.
推荐
Load Switch Monitoring
The INA950-SEP is used to monitor current through load switches in power distribution systems. Its wide common-mode range (up to 80V) allows sensing on the high side of the switch. The ultra-precise measurement enables accurate power consumption monitoring. The low quiescent current (370µA) is beneficial for always-on monitoring circuits. The 1.1MHz bandwidth allows fast detection of load faults. The TSSOP-8 package is suitable for compact power management boards. This is ideal for servers, telecom equipment, and aerospace power systems.
推荐
Test and Measurement Equipment
In test and measurement equipment, the INA950-SEP provides precise current measurements for instrumentation. Its wide common-mode range (up to 80V) allows measurement of high-voltage signals. The ultra-precise gain ensures accurate readings, essential for calibration and diagnostics. The low quiescent current (370µA) reduces self-heating and measurement errors. The 1.1MHz bandwidth enables capturing fast transients. The TSSOP-8 package is suitable for benchtop instruments. This makes it ideal for digital multimeters, power analyzers, and data acquisition systems.
推荐
推荐产品汇总
工程参考数据： INA950-SEP ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | INA951-SEP | INA240A1 | INA281A1 | AD8210 |
|---|---|---|---|---|---|
| Package | TSSOP-8 | TSSOP-8 | TSSOP-8 | TSSOP-8 | TSSOP-8 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Common-Mode Voltage Range | 2.7V to 80V | 2.7V to 80V | 0V to 80V | 0V to 80V | 4.5V to 65V |
| Supply Voltage Range | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 5V to 65V |
| Quiescent Current | 370 µA | 370 µA | 1.8 mA | 1.8 mA | 2 mA |
| Bandwidth | 1.1 MHz | 1.1 MHz | 400 kHz | 1 MHz | 500 kHz |
| Radiation Tolerance | Space Enhanced Product | Space Enhanced Product | None | None | None |
关键差异点
- Radiation-tolerant for space applications （对比 INA240A1)
- Wider common-mode range （对比 AD8210)
- Lower quiescent current （对比 INA240A1)
设计说明
For accurate current sensing, use Kelvin connections to the shunt resistor to minimize parasitic resistance. Place the shunt resistor close to the INA950-SEP inputs (IN+ and IN-) and route the traces as a differential pair. Keep the sense lines short and shielded to reduce noise pickup. A ground plane under the device helps reduce thermal and electrical noise.
The INA950-SEP operates from a 2.7V to 5.5V supply. Bypass the VS pin with a 0.1µF ceramic capacitor placed as close as possible to the pin. For noisy environments, add a 10µF capacitor in parallel. Ensure the supply voltage is stable and within the absolute maximum ratings to avoid damage.
Do not exceed the common-mode voltage range of 80V. Exceeding this can damage the device. Also, ensure the shunt resistor value is chosen to keep the differential input voltage within the linear range of the amplifier. For high-side sensing, the common-mode voltage is the supply rail, so verify it stays within 2.7V to 80V.
合规信息
RoHS compliant per TI product page. Space Enhanced Product, not AEC-Q100 qualified.
