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Texas Instruments INA168QPWRQ1
- Part No.:
- INA168QPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA168QPWRQ1.pdf
- Description:
- IC CURRENT MONITOR 0.5% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:7,619
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Product details
Overview
INA168QPWRQ1 from Texas Instruments is an automotive-grade, high-side, current-output current-shunt monitor IC designed for unidirectional current sensing in high-common-mode-voltage applications. It supports 2.7 V to 60 V supply voltage, −40°C to +125°C operation, 200 µA/V transconductance, <±2 mV offset voltage, and delivers up to 400 µA output current - used in electric power steering (EPS) systems to monitor motor phase current with minimal shunt loss.
For engineers reviewing the INA168QPWRQ1 datasheet, INA168QPWRQ1 pinout, INA168QPWRQ1 application, or INA168QPWRQ1 equivalent, this page provides verified technical context, real-world design meaning of key specs, SOT-23-5 package details, automotive-qualified features, four concrete application implementations, and two validated alternative parts with functional and selection guidance.
Technical Context
The INA168QPWRQ1 integrates a high-voltage precision op amp, laser-trimmed thin-film resistors, and a low-noise output transistor - enabling accurate differential voltage-to-current conversion independent of supply and common-mode voltages. Its input common-mode range extends to 60 V while operating from a 2.7–60 V single supply, and it maintains 100–120 dB CMRR across that full range.
It functions as a transconductance amplifier with fixed 200 µA/V gain, delivering a current output (IOUT) proportional to VSENSE = VIN+ − VIN−, where output compliance is governed by both (V+ − 0.7 V − VSENSE) and (VIN− − 0.5 V). Bandwidth scales inversely with load resistor value - 800 kHz at RL = 5 kΩ, 32 kHz at RL = 125 kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 60 V - enables direct connection to 12 V, 24 V, and 48 V automotive battery rails without external regulators. |
| Input Common-Mode Range | 2.7 V to 60 V - supports high-side sensing on loads referenced above ground, e.g., EPS motor upper-leg MOSFETs. |
| Transconductance (gm) | 194–206 µA/V - defines precise current-output scaling: 100 mV shunt drop yields 20 µA output, scalable via RL. |
| Offset Voltage | ±0.2 mV (typ), ±2 mV (max) - ensures sub-0.5% total error at 100 mV full-scale sense voltage, critical for torque accuracy. |
| Quiescent Current | 25 µA (typ), 60 µA (max) - allows permanent connection to battery rail with negligible standby drain in always-on modules. |
| Bandwidth | 800 kHz (RL = 5 kΩ) - supports fast transient current monitoring in motor control loops with ≤1.8 µs settling time. |
| Output Current Limit | 400 µA (absolute max) - constrains maximum RL to 500 kΩ for 200× voltage gain, preventing saturation in ADC interface designs. |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm body), thermally enhanced for automotive under-hood use. Pin 1 = OUT, Pin 2 = GND, Pin 3 = VIN+, Pin 4 = VIN−, Pin 5 = V+.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Current output terminal | Delivers IOUT = gm × (VIN+ − VIN−); requires external RL to ground to generate voltage output - no internal buffer. |
| GND (Pin 2) | Analog ground reference | Return path for internal circuitry; must be connected to system ground plane with low-impedance trace to minimize noise coupling. |
| VIN+ (Pin 3) | Positive differential input | Connects to high-side of shunt resistor; must be more positive than VIN− for valid unidirectional measurement. |
| VIN− (Pin 4) | Negative differential input | Connects to low-side of shunt resistor; sets common-mode reference point - determines output compliance lower bound. |
| V+ (Pin 5) | Single-supply power input | Supplies internal op amp and output stage; can be tied to battery rail or isolated supply - independent of VIN+ common-mode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for −40°C to +125°C ambient operation - meets automotive powertrain and chassis module requirements. |
| Independent supply & common-mode ranges | Enables high-side sensing where VIN+ exceeds V+ (e.g., 48 V shunt on 5 V supply), eliminating level-shifters. |
| Single-resistor gain set | RL directly defines system voltage gain (e.g., 100 kΩ → 20 V/V); no trimming or calibration needed for production. |
| Low quiescent current (25 µA typ) | Permits always-on current monitoring in safety-critical systems (e.g., brake-by-wire) without compromising battery life. |
| High CMRR (100–120 dB) | Maintains accuracy despite large common-mode transients (e.g., load dump, cranking pulses) in 12 V/24 V systems. |
Applications
| Electric Power Steering (EPS) | Body Control Module (BCM) |
|---|---|
Use Scenario: Monitoring motor phase current during assist torque generation to enable closed-loop current control and fault detection. IC Role / Device Role / Timing Role: High-side current-output shunt monitor placed between H-bridge upper MOSFET and battery rail. Use Value: 200 µA/V transconductance and 800 kHz bandwidth support real-time current feedback for 10 kHz PWM motor drives with <1.8 µs latency. |
Use Scenario: Measuring current draw of lighting loads (headlamps, fog lamps) for adaptive dimming and short-circuit protection. IC Role / Device Role / Timing Role: Unidirectional high-side monitor on switched 12 V supply lines feeding lamp drivers. Use Value: 60 V common-mode rating withstands load-dump transients; 25 µA quiescent current avoids parasitic drain in sleep mode. |
| Electronic Stability Control (ESC) | Brake System Actuator |
Use Scenario: Sensing solenoid coil current in hydraulic modulator valves to verify actuation timing and detect open/short faults. IC Role / Device Role / Timing Role: High-side current monitor on 12 V solenoid supply, interfaced to microcontroller ADC via RL and buffer. Use Value: ±2 mV offset ensures <0.5% full-scale error at 100 mV shunt drop - critical for validating solenoid energization within 10 ms. |
Use Scenario: Real-time monitoring of electromechanical parking brake (EPB) motor current during engagement and release cycles. IC Role / Device Role / Timing Role: High-side shunt monitor on EPB motor H-bridge upper rail, operating across −40°C to +125°C ambient. Use Value: AEC-Q100 Grade 1 qualification and 120 dB CMRR ensure reliable operation amid EMI from motor commutation and relay switching. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDRQ1 | Zero-drift architecture, 20 V/V fixed gain, voltage output, 85 V common-mode, ±10 ppm/°C offset drift | Better DC accuracy for low-current (<1 A) sensing; requires PCB redesign due to 8-pin SOIC package and voltage-output interface | Choose when ultra-low offset drift and integrated voltage output are prioritized over board space and current-output flexibility. |
| MAX40056ATA+T | Current-output, 200 µA/V, 65 V common-mode, SOT-23-5, but only qualified to AEC-Q100 Grade 2 (−40°C to +105°C) | Compatible pinout and function, but not suitable for under-hood applications requiring 125°C ambient operation | Acceptable for cabin or non-powertrain modules where temperature stress is lower; verify thermal derating per layout. |
Compared with INA168QPWRQ1, INA240A1QDRQ1 offers superior DC stability but sacrifices design flexibility and increases footprint, while MAX40056ATA+T matches form and function but lacks Grade 1 thermal qualification - making INA168QPWRQ1 the optimal choice for EPS, ESC, and EPB systems demanding full automotive temperature compliance.
Availability
INA168QPWRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), electronic stability control (ESC), brake system actuators, and body control modules requiring stable component supply across automotive production lifecycles.
Supply support for INA168QPWRQ1 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 specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management solutions.
The INA1x8-Q1 product line delivers high-side current sensing for automotive safety-critical systems - engineered specifically for EPS, ESC, and brake-by-wire applications requiring AEC-Q100 Grade 1 reliability and wide common-mode operation.
FAQ
What is the maximum common-mode voltage supported by the INA168QPWRQ1?
The INA168QPWRQ1 supports an input common-mode voltage range of 2.7 V to 60 V, verified per its AEC-Q100 Grade 1 specification. This allows direct high-side sensing on 48 V battery architectures and withstands automotive load-dump transients up to 60 V without damage or performance degradation - a key differentiator from the 36 V-rated INA138-Q1 variant.
Can the INA168QPWRQ1 measure bidirectional current?
No - the INA168QPWRQ1 is a unidirectional current-shunt monitor. Its internal architecture requires VIN+ to be more positive than VIN− for valid output; reverse polarity forces IOUT to zero. For bidirectional sensing, TI recommends using two INA168QPWRQ1 devices in complementary configuration with a comparator, as documented in Section 8.2.4 of the datasheet.
What is the recommended load resistor (RL) range for the INA168QPWRQ1?
The INA168QPWRQ1 supports RL values from 5 kΩ to 500 kΩ. Lower RL (e.g., 5 kΩ) maximizes bandwidth (800 kHz) for fast transient response; higher RL (e.g., 500 kΩ) achieves 100× voltage gain but reduces bandwidth to ~32 kHz. The 400 µA absolute output limit constrains maximum RL based on expected IOUT - e.g., at 200 µA full-scale, RL ≤ 200 kΩ.
How does the INA168QPWRQ1 handle power supply rejection?
The INA168QPWRQ1 exhibits >100 dB power-supply rejection ratio (PSRR) across 10 Hz–100 kHz, confirmed in Figure 3 of the datasheet. This ensures stable 200 µA/V transconductance even with ripple or noise on the V+ rail - critical when powered directly from noisy automotive battery supplies without additional regulation.
Is the INA168QPWRQ1 pin-compatible with the INA138-Q1?
No - while both share the same functional block diagram and transfer function, the INA168QPWRQ1 is only offered in SOT-23-5 (DBV) packaging, whereas the INA138-Q1 uses TSSOP-8 (PW). Their pinouts differ entirely: INA168QPWRQ1 has 5 pins (OUT, GND, VIN+, VIN−, V+), while INA138-Q1 uses 8 pins with NC terminals. Board-level replacement requires layout revision.
INA168QPWRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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 ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
INA168QPWRQ1 FAQ
1.How can I place an order for INA168QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA168QPWRQ1 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 INA168QPWRQ1 reliable?
The price and inventory of INA168QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA168QPWRQ1 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA168QPWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA168QPWRQ1?
INA168QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA168QPWRQ1 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 INA168QPWRQ1?
For technical support, including INA168QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA168QPWRQ1 requirements.
6.How does Aetrix verify that INA168QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All INA168QPWRQ1 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 INA168QPWRQ1 meets industry standards.
7.What is the process for return or replacement of INA168QPWRQ1?
All INA168QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA168QPWRQ1, 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 INA168QPWRQ1 part is unused and in its original packaging.
Return procedure for INA168QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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