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Texas Instruments INA170EA/250
- Part No.:
- INA170EA/250
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA170EA/250.pdf
- Description:
- IC CURRENT MONITOR 0.5% 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,342
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Product details
Overview
INA170EA/250 from Texas Instruments is a high-side, bidirectional current shunt monitor IC in MSOP-8 package, featuring 2.7V–40V supply range, 2.7V–60V common-mode input voltage, 1000 µA/V transconductance, ±0.2 mV offset voltage (RTI), and 75 µA typical quiescent current - used for precision battery charge/discharge monitoring in portable power systems.
For engineers reviewing the INA170EA/250 datasheet, INA170EA/250 pinout, INA170EA/250 application, or INA170EA/250 equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in battery management and power rail monitoring, and two validated alternative parts with documented functional and packaging differences.
Technical Context
The INA170EA/250 implements a current-output architecture with programmable gain via external load resistor RL and offset control via ROS and VREF. Its input stage operates independently of supply voltage, enabling accurate measurement of shunt voltages up to 500 mV across common-mode voltages from +2.7 V to +60 V while powered from as low as +2.7 V.
It uses an internal transconductance amplifier (gm = 1000 µA/V) with bipolar differential inputs (VIN+ and VIN−), no internal reference, and output current compliance limited by V+ and VIN−. The device supports true bidirectional sensing through external offset programming and maintains <±0.5% total output error over –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7 V to +40 V - enables operation from single Li-ion cell to industrial 24 V rails without level-shifting. |
| Common-Mode Input Range | +2.7 V to +60 V - allows direct high-side sensing on battery packs or 48 V telecom supplies. |
| Transconductance | 1000 µA/V (±1%) - defines precise current-output scaling for predictable gain with RL. |
| Input Offset Voltage (RTI) | ±0.2 mV (typ) - contributes ≤0.4% error at 50 mV full-scale sense voltage. |
| Quiescent Current | 75 µA (typ) - supports ultra-low-power battery-backed monitoring with minimal drain. |
| Bandwidth | 400 kHz (RL = 10 kΩ) - sufficient for fast transient detection in DC-DC converter current limiting. |
| Total Output Error | ±0.5% (max at 100 mV input) - ensures calibrated accuracy without system-level trimming. |
Pinout & Package
INA170EA/250 is housed in an 8-pin MSOP (VSSOP-DGK) package, 3.0 mm × 3.0 mm × 1.1 mm height, with exposed thermal pad (non-electrical). Pin 1 is marked by a dot or beveled corner per JEDEC MO-187.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN− (Pin 1) | Inverting input | Connects to low-side of shunt; polarity determines current direction in bidirectional mode. |
| VIN+ (Pin 2) | Noninverting input | Connects to high-side of shunt; common-mode voltage here may exceed V+ by up to 20 V. |
| VREF (Pin 3) | Reference input | Accepts external voltage (1 V to VS − 1 V) to set output current offset for bidirectional zero-centering. |
| GND (Pin 4) | Analog ground | Return path for ROS, RL, and reference circuitry; separate from power ground in noisy systems. |
| ROS (Pin 5) | Offset resistor terminal | Current path from VREF; sets offset magnitude: IOS = VREF / ROS. |
| OUT (Pin 6) | Current output | Sinks/sourcing current proportional to (VIN+ − VIN−); requires external RL to generate voltage output. |
| NC (Pin 7) | No connection | Internally unconnected; must remain floating or tied to GND (not recommended). |
| V+ (Pin 8) | Positive supply | Power input for internal circuitry; independent of VIN+ common-mode voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing via offset programming | Enables ±10 A measurement with 0–2.5 V output swing using VREF = 2.5 V and ROS = 20 kΩ. |
| Supply-independent common-mode range | Allows 60 V shunt monitoring while powered from 3.3 V microcontroller rail - eliminates level shifters. |
| Programmable gain (1–100×) | Set precisely by RL value (e.g., 10 kΩ → 10× gain); no internal resistors needed. |
| Low 10 nA input bias current | Introduces <0.01% error on 100 mΩ shunt at 1 A - critical for high-accuracy battery coulomb counting. |
| High CMRR (100 dB min) | Maintains accuracy in noisy environments like motor drives or SMPS where common-mode transients exceed 10 V/µs. |
Applications
| Battery Charge/Discharge Monitoring | 48 V Telecom Power Rail Sensing |
|---|---|
Use Scenario: Real-time tracking of charge/discharge current in lithium-ion battery packs for UPS and portable medical devices. IC Role / Device Role / Timing Role: High-side current shunt monitor converting bidirectional shunt voltage into proportional output current for ADC interfacing. Use Value: Enables coulomb counting with ±0.5% total error and 75 µA quiescent draw - extends runtime in always-on backup systems. | Use Scenario: Continuous current monitoring on +48 V DC distribution bus in telecom rectifier cabinets. IC Role / Device Role / Timing Role: High-common-mode current sensor interfaced to isolated sigma-delta ADC via RL and optocoupler. Use Value: Measures up to ±20 A with 2.7–60 V common-mode tolerance - avoids costly isolation amplifiers or Hall sensors. |
| Laptop Adapter Overcurrent Protection | Industrial PLC Analog Input Module |
Use Scenario: Fast-response overcurrent detection in USB-C PD adapter secondary-side regulation loop. IC Role / Device Role / Timing Role: High-bandwidth (400 kHz) current monitor feeding comparator for sub-µs fault shutdown. Use Value: Detects 500 mV shunt overvoltage in <3 µs settling time - meets IEC 62368-1 short-circuit response requirements. | Use Scenario: Precision current measurement channel in modular I/O system for motor drive feedback. IC Role / Device Role / Timing Role: Bidirectional shunt monitor with programmable offset, delivering ratiometric output to 24-bit delta-sigma ADC. Use Value: Delivers <±0.1% nonlinearity and 20 pA/√Hz noise floor - supports 16-bit effective resolution at 100 Hz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side bidirectional current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA219BIDR | Integrated 12-bit ADC, I²C interface, fixed 50 V common-mode, 2.7–5.5 V supply only | Requires no external ADC or signal conditioning; unsuitable for >5.5 V supply or >50 V common-mode | Select when digital output and compact BOM outweigh need for >50 V common-mode or wide supply range. |
| MAX4080TASA+ | Fixed gain (10×, 20×, 50×), 76 V common-mode, 2.7–76 V supply, SO-8 package | No offset programming; unidirectional output unless externally biased; higher quiescent current (125 µA) | Select when fixed-gain simplicity and 76 V common-mode are prioritized over bidirectional zero-centering. |
Compared with INA170EA/250, INA219BIDR integrates digitization but sacrifices common-mode range and supply flexibility, while MAX4080TASA+ extends voltage capability but removes programmable offset - making INA170EA/250 uniquely suited for wide-supply, offset-tuned bidirectional sensing in industrial battery systems.
Availability
INA170EA/250 is available at Aetrix Electronics and suitable for battery management systems, telecom power monitoring, and industrial PLC analog input modules requiring stable component supply and long-term obsolescence planning.
Supply support for INA170EA/250 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, designing analog ICs, embedded processors, and wireless connectivity solutions since 1930.
The INA170 belongs to TI's precision current-sense amplifier product line, engineered specifically for high-common-mode, bidirectional shunt-based measurement in space-constrained, low-power industrial and portable power applications.
FAQ
What is the maximum common-mode voltage the INA170EA/250 can measure?
The INA170EA/250 supports a common-mode input voltage range of +2.7 V to +60 V, independent of its supply voltage (which ranges from +2.7 V to +40 V). This allows it to monitor shunt voltages on high-voltage rails such as 48 V telecom systems or 60 V battery stacks while being powered from a lower-voltage microcontroller supply. Absolute maximum rating is +75 V, but operation beyond +60 V is not specified.
Can the INA170EA/250 perform true bidirectional current measurement without external components?
No - the INA170EA/250 requires external components to achieve true bidirectional measurement. Specifically, a reference voltage (VREF) applied to Pin 3 and an offset resistor (ROS) connected to Pin 5 are mandatory to generate the output current offset that centers the output at zero for zero shunt current. Without these, the device only measures unidirectional current with output starting at zero.
What is the role of the ROS pin (Pin 5) on the INA170EA/250?
The ROS pin (Pin 5) on the INA170EA/250 serves as the return path for current sourced from the VREF pin (Pin 3). It sets the magnitude of the output current offset: IOS = VREF / ROS. For example, applying 2.5 V to VREF with a 20 kΩ ROS yields a 125 µA offset current, enabling ±10 A measurement across a 0.0125 Ω shunt with 0–2.5 V output swing - a key enabler of bidirectional sensing.
Does the INA170EA/250 require power supply decoupling capacitors?
The INA170EA/250 does not require bypass capacitors for stability, as stated in the datasheet. However, applications with noisy or high-impedance power supplies - such as switch-mode power rails or long PCB traces - benefit from a 0.1 µF ceramic capacitor placed as close as possible between Pin 8 (V+) and Pin 4 (GND) to suppress supply ripple and improve PSRR performance above 10 kHz.
What is the minimum shunt voltage the INA170EA/250 can accurately resolve?
The INA170EA/250 has a typical input offset voltage of ±0.2 mV (RTI) and 100 dB minimum CMRR. With proper layout and ROS/VREF calibration, it can resolve shunt voltages down to ~10 mV full-scale while maintaining <1% error. The datasheet specifies full-scale sense voltage from 100 mV to 500 mV for optimal accuracy, but usable linear range extends down to 10 mV with increased relative offset impact.
INA170EA/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Monitor
- Sensing Method:
- High-Side
- Accuracy:
- ±0.5%
- Voltage - Input:
- 2.7V ~ 60V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
INA170EA/250 FAQ
1.How can I place an order for INA170EA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA170EA/250 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for INA170EA/250 reliable?
The price and inventory of INA170EA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA170EA/250 is usually 5 days.
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4.How is shipping managed for INA170EA/250?
INA170EA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA170EA/250 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for INA170EA/250?
For technical support, including INA170EA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA170EA/250 requirements.
6.How does Aetrix verify that INA170EA/250 is sourced from the original manufacturer or authorized distributors?
All INA170EA/250 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that INA170EA/250 meets industry standards.
7.What is the process for return or replacement of INA170EA/250?
All INA170EA/250 units undergo pre-shipment inspection (PSI). If there is an issue with INA170EA/250, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The INA170EA/250 part is unused and in its original packaging.
Return procedure for INA170EA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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