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Texas Instruments INA138QPWRQ1
- Part No.:
- INA138QPWRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA138QPWRQ1.pdf
- Description:
- IC CURRENT MONITOR 0.5% 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,860
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Product details
Overview
INA138QPWRQ1 from Texas Instruments is an automotive-grade, high-side, current-output current-shunt monitor IC designed for unidirectional current sensing in systems with high common-mode voltages up to 36 V. It features 200 µA/V transconductance, ±0.2 mV offset voltage, 25 µA quiescent current, and operates from –40°C to +125°C in TSSOP-8 packaging - used in electric power steering (EPS) and brake control modules.
For engineers reviewing the INA138QPWRQ1 datasheet, INA138QPWRQ1 pinout, INA138QPWRQ1 application, or INA138QPWRQ1 equivalent, key selection criteria include its independent input common-mode and supply voltage ranges, single-resistor gain configuration via external RL, current-output architecture enabling high-impedance signal routing, and AEC-Q100 Grade 1 qualification for under-hood automotive use.
Technical Context
The INA138QPWRQ1 integrates a precision high-voltage op amp, laser-trimmed thin-film resistors, and a low-noise output transistor in a single-supply architecture. Its input common-mode voltage range (2.7 V to 36 V) exceeds the supply voltage (V+), enabling true high-side sensing across shunts connected to battery rails.
It delivers a proportional output current (IOUT = gm × VSENSE, where gm = 200 µA/V) rather than a voltage output - requiring an external load resistor (RL) to convert to voltage. Gain is fully set by RL, supporting configurable voltage gains from 1× to 100×, with nonlinearity error limited to ±0.01% over 10–150 mV input range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 36 V - supports direct connection to 12 V/24 V automotive batteries without level-shifting. |
| Input Common-Mode Range | 2.7 V to 36 V - enables accurate high-side sensing on positive rails up to battery voltage. |
| Transconductance (gm) | 200 µA/V typical - defines linear IOUT vs. VSENSE relationship; sets system gain with RL. |
| Offset Voltage | ±0.2 mV max - contributes ≤0.4% error at 50 mV full-scale shunt voltage. |
| Quiescent Current | 25 µA typical - minimizes parasitic loading on shunt measurement path and extends system standby life. |
| Bandwidth | 800 kHz (RL = 5 kΩ); 32 kHz (RL = 125 kΩ) - trade-off between gain accuracy and dynamic response. |
| Operating Temperature | –40°C to +125°C - qualified per AEC-Q100 Grade 1 for engine compartment and chassis applications. |
Pinout & Package
TSSOP-8 package (4.40 mm × 3.00 mm), thermally enhanced for automotive ambient conditions; pin-compatible with industry-standard layout footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN– | Negative differential input | Connects to low side of shunt resistor; referenced to VIN+ for VSENSE = VIN+ − VIN−. |
| VIN+ | Positive differential input | Connects to high side of shunt; must be ≥ VIN− to maintain unidirectional operation. |
| GND | Analog ground reference | Return path for internal circuitry; separate from power ground to minimize noise coupling. |
| OUT | Current output terminal | Sinks proportional current (IOUT); requires external RL to ground for voltage conversion. |
| V+ | Power supply input | Supplies internal circuitry; independent of VIN+/VIN− common-mode range. |
| NC (Pins 3, 5, 7) | No internal connection | Unbonded die pads; must remain floating - no PCB trace or thermal pad connection. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2 kV / CDM ±1 kV ESD robustness. |
| Independent V+ and common-mode ranges | Enables V+ = 5 V while sensing across 24 V shunt - eliminates need for isolated supplies or level shifters. |
| Single-resistor gain programming | RL value directly sets system voltage gain (e.g., 100 kΩ → 20× gain); no trimming or calibration required. |
| High output impedance (>1 GΩ) | Prevents loading errors when driving high-Z circuits (e.g., ADC inputs, buffer amplifiers, filters). |
| Low 0.01% nonlinearity | Ensures monotonic response across full 10–150 mV input range - critical for precision motor current feedback. |
Applications
| Electric Power Steering (EPS) | Brake Control Module |
|---|---|
|
Use Scenario: Real-time monitoring of motor phase current during assist torque generation and regenerative braking. IC Role / Device Role / Timing Role: High-side current-output shunt monitor converting millivolt-level shunt voltage into scalable current signal routed to MCU ADC via buffer. Use Value: Enables accurate torque estimation and fault detection with <0.5% total output error across –40°C to 125°C, meeting ISO 26262 ASIL-B requirements. |
Use Scenario: Measuring solenoid coil current in electro-hydraulic brake (EHB) actuators to verify commanded pressure delivery. IC Role / Device Role / Timing Role: Unidirectional current sensor placed on high-side of 12 V solenoid supply, rejecting battery ripple and load dump transients. Use Value: Delivers stable 25 µA quiescent current draw and 800 kHz bandwidth for fast solenoid response verification without compromising MCU power budget. |
| Body Control Module (BCM) | Electronic Stability Control (ESC) |
|
Use Scenario: Monitoring current draw of HVAC blower motors, seat heaters, and lighting loads for diagnostics and energy management. IC Role / Device Role / Timing Role: High-common-mode current sense amplifier interfaced to 12-bit SAR ADC through OPA340 buffer to avoid impedance mismatch errors. Use Value: Supports programmable gain (via RL) from 1× to 100×, allowing one BOM part to cover multiple load current ranges (0.5 A to 30 A) with shared firmware scaling. |
Use Scenario: Detecting wheel motor current asymmetry during yaw correction maneuvers in all-wheel-drive ESC systems. IC Role / Device Role / Timing Role: Precision current mirror front-end feeding dual-slope ADC for synchronized sampling across four wheel channels. Use Value: Achieves ±0.2 mV offset and <10 nA/°C drift - minimizing temperature-induced bias in differential wheel torque calculations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current-sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QPWRQ1 | Zero-drift architecture, 80 V common-mode, 120 dB CMRR, 500 kHz bandwidth, voltage output. | Better DC accuracy and higher common-mode range; requires PCB redesign due to voltage-output interface and different pinout. | Preferred when ultra-low offset drift (<0.01 µV/°C) and >36 V rail sensing are required - not drop-in compatible. |
| MAX40056ATA+T | Current-output, 65 V common-mode, 250 µA quiescent current, ±100 mV input range, SOT-23-5 package. | Higher common-mode capability but lower temperature grade (–40°C to +105°C); lacks AEC-Q100 Grade 1 certification. | Consider only for non-safety-critical 12 V systems where TSSOP-8 footprint is not mandatory and Grade 1 qualification is waived. |
Compared with INA138QPWRQ1, INA240A1QPWRQ1 offers superior DC precision and extended voltage range but demands layout changes and firmware adaptation for voltage-output integration; MAX40056ATA+T provides compact packaging and higher voltage tolerance but omits automotive temperature and reliability validation needed for EPS or brake systems.
Availability
INA138QPWRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), brake control modules, and electronic stability control (ESC) systems requiring stable component supply across automotive production lifecycles.
Supply support for INA138QPWRQ1 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 safety-critical automotive subsystems - engineered specifically for unidirectional shunt monitoring in harsh environments with minimal power overhead and AEC-Q100 compliance.
FAQ
What is the maximum common-mode voltage supported by the INA138QPWRQ1?
The INA138QPWRQ1 supports an input common-mode voltage range of 2.7 V to 36 V, independent of its supply voltage (V+). This allows it to accurately measure shunt voltage on high-side 12 V or 24 V rails - such as those found in EPS or BCM applications - without requiring level-shifting circuitry. Exceeding 36 V may cause permanent damage or measurement inaccuracy.
How is gain configured for the INA138QPWRQ1?
Gain for the INA138QPWRQ1 is set exclusively by the external load resistor (RL) connected between OUT and GND. Since the device outputs current (IOUT = 200 µA/V × VSENSE), the resulting voltage is VOUT = IOUT × RL. For example, a 50 kΩ RL yields 10× gain (100 mV input → 1 V output). No internal resistors or digital configuration are involved - simplifying design and reducing BOM count.
Can the INA138QPWRQ1 be used for bidirectional current sensing?
The INA138QPWRQ1 is specified for unidirectional current sensing only - its functional block diagram and absolute maximum ratings assume VIN+ ≥ VIN−. For bidirectional applications (e.g., regenerative braking), TI recommends using two INA138QPWRQ1 devices in opposing configurations with a comparator, as shown in Figure 15 of the datasheet. Direct reversal of polarity risks forcing IOUT to zero and invalidating measurement integrity.
What is the purpose of the NC pins on the INA138QPWRQ1 TSSOP-8 package?
Pins 3, 5, and 7 of the INA138QPWRQ1 TSSOP-8 package are designated NC (no internal connection) - they are unconnected die bond pads with no electrical function. These pins must remain unconnected on the PCB: no traces, vias, or thermal reliefs should attach to them. Doing so could introduce leakage paths, noise coupling, or mechanical stress affecting long-term reliability in automotive thermal cycling.
Does the INA138QPWRQ1 require a minimum load resistor value for stable operation?
Yes - the INA138QPWRQ1 requires RL ≥ 5 kΩ for guaranteed performance within datasheet specifications. At lower values (e.g., 1 kΩ), bandwidth increases but output compliance voltage drops significantly, and total output error rises beyond ±3.2%. The 5 kΩ minimum ensures the device maintains 800 kHz bandwidth, <0.5% total error, and proper output swing relative to V+ and VIN−, as validated across the full –40°C to +125°C range.
INA138QPWRQ1 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 ~ 36V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-TSSOP
INA138QPWRQ1 FAQ
1.How can I place an order for INA138QPWRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA138QPWRQ1 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 INA138QPWRQ1 reliable?
The price and inventory of INA138QPWRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA138QPWRQ1 is usually 5 days.
3.What payment methods are accepted for INA138QPWRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA138QPWRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA138QPWRQ1?
INA138QPWRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA138QPWRQ1 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 INA138QPWRQ1?
For technical support, including INA138QPWRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA138QPWRQ1 requirements.
6.How does Aetrix verify that INA138QPWRQ1 is sourced from the original manufacturer or authorized distributors?
All INA138QPWRQ1 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 INA138QPWRQ1 meets industry standards.
7.What is the process for return or replacement of INA138QPWRQ1?
All INA138QPWRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA138QPWRQ1, 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 INA138QPWRQ1 part is unused and in its original packaging.
Return procedure for INA138QPWRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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