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Texas Instruments INA281B5QDBVRQ1
- Part No.:
- INA281B5QDBVRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA281B5QDBVRQ1.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,851
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Product details
Overview
INA281B5QDBVRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (–40 °C to +125 °C) unidirectional current-sense amplifier optimized for high-speed overcurrent protection in automotive power stages. It features a fixed gain of 500 V/V, 1.3 MHz bandwidth, –4 V to +110 V common-mode input range, ±0.5% max gain error, and operates from 2.7 V to 20 V supply - enabling precise low-VSENSE measurement in half-bridge motor drivers and solenoid control modules.
For engineers reviewing the INA281B5QDBVRQ1 datasheet, INA281B5QDBVRQ1 pinout, INA281B5QDBVRQ1 application, or INA281B5QDBVRQ1 equivalent, key selection criteria include its 500 V/V gain for sub-10 mΩ shunt compatibility, survival voltage up to +120 V, 2.5 V/µs slew rate for <2 µs overcurrent response, and SOT-23-5 package suitability for space-constrained engine control units.
Technical Context
The INA281B5QDBVRQ1 uses a transconductance architecture with current-feedback amplifier topology, delivering 20 µA typical input bias current at 110 V common-mode and enabling low-leakage sensing in high-side configurations. Its zero-drift input stage ensures ±0.1 µV/°C offset drift and ±55 µV typical offset voltage across –40 °C to +125 °C.
This variant is strictly unidirectional and supports only positive current flow from supply to load. Its 900 kHz bandwidth (at VSENSE = 8 mV) and 65 dB AC CMRR at 50 kHz are specified for fast transient rejection in gasoline/diesel engine platforms and HVAC compressor modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 500 V/V - enables accurate current measurement with ≤1 mΩ shunt resistors at 10 A full-scale, minimizing I²R losses. |
| Bandwidth | 900 kHz - supports detection of fast inrush currents in <2 µs (e.g., 75 A on 2 mΩ shunt), critical for OCP in valve actuators. |
| Common-mode range | –4 V to +110 V - allows operation below ground for recirculating current sensing in half-bridge motor drives. |
| Gain error | ±0.5% max - ensures <5 mV output error at 1 V output, supporting high-accuracy closed-loop current regulation. |
| Offset voltage | ±55 µV typical - enables resolution of <110 nA sensed current with 500 Ω effective shunt impedance (VOS/G). |
| Supply range | 2.7 V to 20 V - compatible with 5 V and 12 V automotive rails without external regulators. |
| Slew rate | 2.5 V/µs - sustains linear output response during fast current transients without distortion or saturation. |
Pinout & Package
SOT-23-5 (DBV) package, 2.90 mm × 1.60 mm body size, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplified output voltage | Delivers G × (VIN+ – VIN−) signal; rail-to-rail swing capability (GND + 5 mV to VS – 70 mV) supports direct MCU ADC interfacing. |
| 2 - GND | Analog ground reference | Return path for internal bias network and output stage; must be connected to low-impedance system ground to maintain CMRR. |
| 3 - VS | Positive power supply | Accepts 2.7 V–20 V; powers internal amplifier and buffer; decoupling capacitor required within 1 cm for stability. |
| 4 - IN+ | Positive shunt sense input | Connects to high-side of current-shunt resistor; 20 µA typical bias current minimizes loading error on precision shunts. |
| 5 - IN− | Negative shunt sense input | Connects to low-side of shunt; matched input structure with IN+ ensures 120 dB DC CMRR and stable operation at –4 V common-mode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive use from –40 °C to +125 °C ambient, including thermal cycling and HBM ±2000 V ESD robustness. |
| Functional safety documentation support | TI provides FIT rate data, failure mode analysis, and diagnostic coverage guidance for ISO 26262 ASIL-B system integration. |
| Survival voltage rating | Withstands –20 V to +120 V common-mode transients without latch-up or parametric shift - essential for load-dump immunity. |
| Low input bias current | 20 µA typical at 110 V common-mode - reduces measurement error on high-value shunts and enables use with >10 kΩ filter networks. |
| High AC CMRR | 65 dB at 50 kHz - rejects PWM switching noise in motor drive applications where VCM contains high-frequency ripple. |
Applications
| Automatic Transmission Control | Automotive HVAC Compressor Module |
|---|---|
Use Scenario: Real-time monitoring of clutch solenoid coil current during gear-shift actuation under 12 V battery supply with load-dump transients. IC Role / Device Role / Timing Role: Unidirectional current-sense amplifier providing analog feedback to transmission control unit (TCU) for closed-loop solenoid current regulation. Use Value: 500 V/V gain enables use of 0.5 mΩ shunt, limiting power loss to <50 mW at 10 A while maintaining 5 mV resolution - improving thermal margin and shift timing accuracy. |
Use Scenario: High-side current monitoring of brushless DC compressor motor phase current in 48 V mild-hybrid HVAC systems. IC Role / Device Role / Timing Role: High-bandwidth (900 kHz), low-offset current sensor feeding fast-response overcurrent protection logic in inverter gate driver IC. Use Value: 2.5 V/µs slew rate and <2 µs response time allow detection of 100 A fault currents before IGBT destruction - meeting ASIL-D functional safety timing requirements. |
| Valve/Motor Actuator | Gasoline & Diesel Engine Platform |
Use Scenario: Precision current measurement in 24 V electro-hydraulic power steering (EHPS) assist motor with bidirectional PWM drive. IC Role / Device Role / Timing Role: Low-drift (±0.1 µV/°C), high-CMRR (120 dB DC) amplifier capturing recirculating current during PWM off-time in half-bridge configuration. Use Value: –4 V common-mode capability enables accurate measurement of negative current during energy recovery, improving torque control fidelity and reducing acoustic noise. |
Use Scenario: Fuel injector driver current sensing in multi-cylinder gasoline direct injection (GDI) engines operating at 14 V nominal with cranking dips to 6 V. IC Role / Device Role / Timing Role: Wide-supply (2.7–20 V), temperature-stable current monitor interfaced to engine control unit (ECU) for injector health diagnostics and misfire detection. Use Value: ±0.5% gain error over temperature ensures consistent injector pulse-width calibration across –40 °C cold start to +125 °C under-hood conditions - reducing emissions variability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A5QDRQ1 | 500 V/V gain, but 4 V/V to 500 V/V programmable via external resistors; 350 kHz bandwidth; ±150 µV max offset. | Supports bidirectional sensing and gain reconfiguration in-field; lower bandwidth limits use in >100 kHz PWM systems. | Select when design requires flexibility to adapt gain per channel or support reverse-current detection - not for fixed-gain, ultra-fast OCP. |
| MAX40056ATA+T | 500 V/V gain, 1.5 MHz bandwidth, but only –0.2 V to +65 V common-mode; ±150 µV max offset; no AEC-Q100 qualification. | Lacks automotive qualification and negative common-mode capability - unsuitable for half-bridge recirculation or load-dump environments. | Select only for non-automotive industrial applications requiring higher bandwidth and lower cost - not for ASIL-relevant vehicle subsystems. |
Compared with INA281B5QDBVRQ1, INA240A5QDRQ1 trades fixed-gain precision and speed for configurability, while MAX40056ATA+T offers higher bandwidth but sacrifices automotive reliability and negative common-mode operation - making INA281B5QDBVRQ1 the optimal choice for AEC-Q100-compliant, high-speed, high-CMRR unidirectional sensing.
Availability
INA281B5QDBVRQ1 is available at Aetrix Electronics and suitable for automatic transmission control, automotive HVAC compressor modules, and gasoline & diesel engine platform designs requiring stable component supply, long-term automotive-grade availability, and traceable sourcing.
Supply support for INA281B5QDBVRQ1 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, specializing in analog and embedded processing technologies with leadership in automotive, industrial, and power management solutions.
The INA281-Q1 product line delivers high-precision, AEC-Q100-qualified current-sense amplifiers targeting real-time current monitoring and fast overcurrent protection in automotive powertrain and chassis systems.
FAQ
What is the maximum common-mode voltage the INA281B5QDBVRQ1 can withstand continuously?
The INA281B5QDBVRQ1 has a continuous operational common-mode input range of –4 V to +110 V. Its survival rating extends to –20 V to +120 V, meaning it can tolerate short-duration transients (e.g., load dump) within that range without damage or parametric shift - critical for under-hood automotive applications where battery voltage spikes exceed 110 V.
Does the INA281B5QDBVRQ1 support bidirectional current sensing?
No, the INA281B5QDBVRQ1 operates in unidirectional mode only and is designed to measure current flowing from supply to load. It cannot accurately sense reverse current or negative differential inputs - this is inherent to its internal architecture and confirmed in the Functional Block Diagram and Section 8.4.1 of the datasheet.
What is the bandwidth of the INA281B5QDBVRQ1 at its 500 V/V gain setting?
At 500 V/V gain, the INA281B5QDBVRQ1 has a –3 dB bandwidth of 900 kHz when VSENSE = 8 mV and CLOAD = 5 pF. This is explicitly specified in Section 6.5 Electrical Characteristics and Figure 7-3, and reflects its optimization for high-speed overcurrent detection in motor and solenoid drivers.
Can the INA281B5QDBVRQ1 be used with a 3.3 V supply?
Yes, the INA281B5QDBVRQ1 operates from 2.7 V to 20 V, so 3.3 V is within its recommended supply range. At 3.3 V, its output swing is limited to GND + 5 mV to VS – 70 mV (i.e., ~3.23 V max), and full-scale output for 10 A with a 1 mΩ shunt remains ~5 V - requiring scaling or attenuation before 3.3 V ADC input.
How does the pinout of INA281B5QDBVRQ1 differ from INA281A5QDBVRQ1?
The INA281B5QDBVRQ1 uses Pin 3 for VS and Pin 5 for IN−, whereas the INA281A5QDBVRQ1 uses Pin 5 for VS and Pin 4 for IN− (per Figures 5-1 and 5-2). This difference affects PCB layout - swapping variants without board revision causes functional failure due to incorrect power and input connections.
INA281B5QDBVRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2.5V/µs
- Gain Bandwidth Product:
- 1.3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 20 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
INA281B5QDBVRQ1 FAQ
1.How can I place an order for INA281B5QDBVRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA281B5QDBVRQ1 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 INA281B5QDBVRQ1 reliable?
The price and inventory of INA281B5QDBVRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA281B5QDBVRQ1 is usually 5 days.
3.What payment methods are accepted for INA281B5QDBVRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA281B5QDBVRQ1 transactions.
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4.How is shipping managed for INA281B5QDBVRQ1?
INA281B5QDBVRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA281B5QDBVRQ1 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 INA281B5QDBVRQ1?
For technical support, including INA281B5QDBVRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA281B5QDBVRQ1 requirements.
6.How does Aetrix verify that INA281B5QDBVRQ1 is sourced from the original manufacturer or authorized distributors?
All INA281B5QDBVRQ1 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 INA281B5QDBVRQ1 meets industry standards.
7.What is the process for return or replacement of INA281B5QDBVRQ1?
All INA281B5QDBVRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA281B5QDBVRQ1, 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 INA281B5QDBVRQ1 part is unused and in its original packaging.
Return procedure for INA281B5QDBVRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA281B5QDBVRQ1 Tags
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LM358DT
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LM358DR
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MCP6006T-E/OT
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MCP6006UT-E/OT
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