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Texas Instruments INA310B3QDGKRQ1

Name: INA310B3QDGKRQ1
Brand: Texas Instruments
SKU: INA310B3QDGKRQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: INA310B3QDGKRQ1

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

Package:: 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)

Datasheet:: INA310B3QDGKRQ1.pdf

Description:: AEC-Q100 -4-V TO 110-V 1.3-MHZ H

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Product details

Overview

INA310B3QDGKRQ1 from Texas Instruments is an AEC-Q100 Grade 1 (−40°C to +125°C) ultra-precise current sense amplifier with integrated open-drain comparator and 0.6 V internal reference, designed for high-side or low-side shunt monitoring in automotive power systems. It delivers 100 V/V fixed gain, −4 V to +110 V common-mode input range, 1.3 MHz bandwidth, and ±30 µV max offset voltage (25°C), enabling fast overcurrent detection in eTurbo, EPS, and regenerative braking circuits.

For engineers reviewing the INA310B3QDGKRQ1 datasheet, INA310B3QDGKRQ1 pinout, INA310B3QDGKRQ1 application, or INA310B3QDGKRQ1 equivalent, this page provides verified technical context, exact pin functions, real-world automotive use cases, and validated alternative options - all grounded in TI's SBOSAD3 production data sheet and official package documentation.

Technical Context

The INA310B3QDGKRQ1 employs a zero-drift, precision current-sense architecture that maintains ±30 µV max input offset and 0.5% max gain error across −40°C to +125°C, while supporting common-mode voltages beyond supply rails (−4 V to +110 V). Its 1.3 MHz signal bandwidth and 2.5 V/µs slew rate enable sub-microsecond response to fast current transients.

It integrates a comparator with 0.6 V internal reference, 1 µs propagation delay, and latching capability controlled by the RESET pin - allowing transparent or latch-on-trip operation without external components. The comparator input accepts up to 5.5 V or VS (whichever is lower), and its open-drain CMPOUT supports pull-up to 20 V independent of VS.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain	100 V/V - fixed internal ratio; sets output scaling for 10 mV shunt drop → 1 V output, optimizing SNR for mid-range current sensing.
Common-mode range	−4 V to +110 V - enables direct high-side sensing on 48 V/60 V battery rails and fault-tolerant operation during load dump.
Bandwidth	1.0 MHz - specified at C_LOAD = 5 pF and V_SENSE = 40 mV; sufficient for <1 µs overcurrent trip latency in EPS motor control.
Offset voltage (max)	±30 µV at 25°C - enables accurate measurement of sub-10 mV shunt drops (e.g., 100 µΩ @ 100 A), critical for low-loss designs.
Supply range	2.7 V to 20 V - compatible with 3.3 V microcontroller I/O and 12 V/24 V vehicle systems; output swing limited to GND+5 mV / VS−150 mV.
Comparator threshold	0.6 V ±20 mV (−40°C to +125°C) - stable reference for resistor-divider-based trip point setting; 8 mV hysteresis prevents noise-induced chatter.
Quiescent current	2.25 mA max (−40°C to +125°C) - enables always-on monitoring in safety-critical subsystems without excessive thermal load.

Pinout & Package

VSSOP-8 package (3.00 mm × 4.90 mm), thermally enhanced for automotive under-hood environments; RoHS-compliant, moisture sensitivity level 2a.

Pin/Terminal	Circuit Role	Design Meaning
VS	Power supply input	Accepts 2.7–20 V; powers both amplifier and comparator; no internal regulation - requires local decoupling.
OUT	Amplifier output	Analog voltage proportional to shunt current × 100; drives ADC or external comparator divider; rail-to-rail capable within VS−150 mV/GND+5 mV.
CMPIN	Comparator analog input	High-impedance node (IB < 20 nA near 0.6 V); accepts divided OUT voltage to set overcurrent threshold; supports 0–5.5 V input range.
GND	Analog ground reference	Single-point return for amplifier, comparator, and reference; must be isolated from noisy power grounds to preserve 160 dB CMRR.
RESET	Comparator mode control	Active-high latching enable; open or grounded = transparent mode; pulled high = latch-on-trip; internal 2 MΩ pulldown ensures safe default.
CMPOUT	Comparator open-drain output	Drives low when CMPIN < (0.6 V − 8 mV); requires external pull-up (e.g., 5.1 kΩ to VS or 12 V) for system-level fault signaling.
IN−	Shunt negative sense	Connect to load side (high-side) or ground side (low-side); handles −20 V to +120 V survival voltage; 20 µA bias current independent of V_CM.
IN+	Shunt positive sense	Connect to bus side (high-side) or load side (low-side); same survival rating as IN−; differential input rejects common-mode noise in noisy harnesses.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for −40°C to +125°C ambient operation with full parametric compliance - required for EPS, brake, and starter/generator ECUs.
Integrated 0.6 V reference + comparator	Eliminates external reference IC and comparator; reduces BOM count and layout area while guaranteeing 1 µs total trip latency from V_SENSE overthreshold.
Zero-drift topology	Maintains ±30 µV max offset and 0.5% max gain error over temperature - enables single-shunt bidirectional sensing without recalibration in thermal cycling environments.
160 dB DC CMRR	Rejects battery ripple, PWM switching noise, and EMI coupling on high-voltage rails - preserves accuracy even with 100 V common-mode transients.
Latching vs transparent comparator mode	Configurable via RESET pin: latch mode holds fault state until manual reset; transparent mode allows continuous monitoring - selectable per subsystem safety requirements.

Applications

eTurbo / 48 V Mild Hybrid System	Electric Power Steering (EPS)
Use Scenario: Real-time motor phase current monitoring during boost and regeneration cycles in 48 V eTurbo inverters. IC Role / Device Role / Timing Role: High-side current sense amplifier with integrated comparator triggers immediate gate shutdown on overcurrent events. Use Value: 1.0 MHz bandwidth and 1 µs comparator propagation delay enable protection within one switching cycle (<1 µs) at 500 kHz PWM frequency.	Use Scenario: Continuous torque motor current sensing in column-assist EPS modules exposed to engine bay thermal stress. IC Role / Device Role / Timing Role: Precision shunt amplifier feeding ADC and comparator for torque-loop feedback and stall/fault detection. Use Value: ±30 µV offset and 0.5% gain error ensure <0.5% current measurement error across −40°C to +125°C - critical for ASIL-B functional safety compliance.
Starter/Generator (P4 Architecture)	Regenerative Braking Control
Use Scenario: Bidirectional current sensing on high-voltage (up to 110 V) starter-generator bus during cranking and energy recovery. IC Role / Device Role / Timing Role: Dual-role amplifier/comparator monitors charge/discharge current magnitude and direction for battery management logic. Use Value: −4 V to +110 V common-mode range supports direct connection to P4 bus without level-shifting; 20 µA input bias minimizes shunt error at low currents.	Use Scenario: Fast-response current monitoring during dynamic regen events where motor acts as generator feeding back into 48 V battery. IC Role / Device Role / Timing Role: High-bandwidth current sensor feeding both closed-loop regen torque control and overcurrent cutoff logic. Use Value: 2.5 V/µs slew rate and 100 V/V gain enable accurate capture of rapid current reversals (e.g., 0→−200 A in <5 µs) without slew-induced distortion.

eTurbo / 48 V Mild Hybrid System

Electric Power Steering (EPS)

Use Scenario: Real-time motor phase current monitoring during boost and regeneration cycles in 48 V eTurbo inverters.

IC Role / Device Role / Timing Role: High-side current sense amplifier with integrated comparator triggers immediate gate shutdown on overcurrent events.

Use Value: 1.0 MHz bandwidth and 1 µs comparator propagation delay enable protection within one switching cycle (<1 µs) at 500 kHz PWM frequency.

Use Scenario: Continuous torque motor current sensing in column-assist EPS modules exposed to engine bay thermal stress.

IC Role / Device Role / Timing Role: Precision shunt amplifier feeding ADC and comparator for torque-loop feedback and stall/fault detection.

Use Value: ±30 µV offset and 0.5% gain error ensure <0.5% current measurement error across −40°C to +125°C - critical for ASIL-B functional safety compliance.

Starter/Generator (P4 Architecture)

Regenerative Braking Control

Use Scenario: Bidirectional current sensing on high-voltage (up to 110 V) starter-generator bus during cranking and energy recovery.

IC Role / Device Role / Timing Role: Dual-role amplifier/comparator monitors charge/discharge current magnitude and direction for battery management logic.

Use Value: −4 V to +110 V common-mode range supports direct connection to P4 bus without level-shifting; 20 µA input bias minimizes shunt error at low currents.

Use Scenario: Fast-response current monitoring during dynamic regen events where motor acts as generator feeding back into 48 V battery.

IC Role / Device Role / Timing Role: High-bandwidth current sensor feeding both closed-loop regen torque control and overcurrent cutoff logic.

Use Value: 2.5 V/µs slew rate and 100 V/V gain enable accurate capture of rapid current reversals (e.g., 0→−200 A in <5 µs) without slew-induced distortion.

Equivalent & Alternatives

The following parts are listed as comparable options for similar current sense amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
INA240A3QDRQ1	Same 100 V/V gain, but wider −5 V to +80 V common-mode range; no integrated comparator; 10 ppm/°C gain drift vs. 20 ppm/°C.	Lacks comparator and reference - requires external fault-detection circuitry; better for pure measurement-only roles.	Select when system already implements comparator logic externally and prioritizes lowest possible gain drift over integration.
MAX40056ATA+T	100 V/V gain, −0.2 V to +65 V common-mode, 1.5 MHz bandwidth; includes comparator but uses external reference; 1.5 µs propagation delay.	Requires external 0.6 V reference; higher propagation delay limits use in sub-µs protection loops.	Select when operating below 65 V common-mode and board space permits discrete reference; not suitable for >65 V or <1.2 µs latency targets.

Compared with INA310B3QDGKRQ1, INA240A3QDRQ1 trades integrated protection for superior gain stability, while MAX40056ATA+T offers higher bandwidth but sacrifices common-mode range and adds component count - making INA310B3QDGKRQ1 optimal for compact, high-voltage automotive overcurrent protection with minimal external parts.

Availability

INA310B3QDGKRQ1 is available at Aetrix Electronics and suitable for electric power steering (EPS), eTurbo actuation, and regenerative braking systems requiring stable component supply, AEC-Q100 compliance, and long-term automotive lifecycle support.

Supply support for INA310B3QDGKRQ1 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 leader specializing in analog and embedded processing technologies, with deep expertise in automotive-grade signal conditioning and power management ICs.

The INA310x-Q1 product line was engineered specifically for high-reliability automotive current sensing - combining precision amplification, integrated fault detection, and AEC-Q100 qualification to simplify functional safety design in EPS, brake, and hybrid powertrain systems.

FAQ

What is the maximum common-mode voltage the INA310B3QDGKRQ1 can withstand during transient conditions?

The INA310B3QDGKRQ1 has a survival common-mode voltage rating of −20 V to +120 V, as specified in Absolute Maximum Ratings. This allows it to endure automotive load-dump transients (up to +120 V) and reverse-battery conditions (down to −20 V) without damage - critical for under-hood applications where electrical stress is routine. Operation remains functional within −4 V to +110 V.

Does the INA310B3QDGKRQ1 require external components to configure its 100 V/V gain?

No, the INA310B3QDGKRQ1 features a factory-trimmed, fixed 100 V/V gain implemented via an internal precision resistor network. No external resistors or configuration pins are needed - eliminating gain-setting errors, temperature drift from external components, and PCB layout sensitivity. This simplifies design and improves long-term accuracy versus adjustable-gain alternatives.

How does the RESET pin affect comparator behavior in the INA310B3QDGKRQ1?

The RESET pin configures the comparator between two modes: when left open or tied to GND, the INA310B3QDGKRQ1 operates in transparent mode (CMPOUT follows CMPIN in real time); when pulled high to VS, it enters latching mode (CMPOUT stays high after first overthreshold event until RESET is released). This dual-mode flexibility supports both continuous monitoring and fault-hold requirements in ASIL-B/C systems.

Can the INA310B3QDGKRQ1 accurately measure bidirectional current flow?

Yes - the INA310B3QDGKRQ1 supports bidirectional sensing when used with a center-tapped shunt or differential ADC interface. Its symmetric input structure (IN+, IN−), rail-to-rail output swing (GND+5 mV to VS−150 mV), and zero-drift architecture maintain ±30 µV offset accuracy across polarity reversal - enabling precise torque-direction detection in EPS and regen braking without hardware modification.

What is the minimum shunt voltage the INA310B3QDGKRQ1 can resolve with usable accuracy?

The practical minimum shunt voltage for the INA310B3QDGKRQ1 is determined by its ±30 µV max offset and 100 V/V gain: V_SENSE(min) ≈ 30 µV / 100 = 300 nV, but system-limited resolution is governed by output swing to GND (5 mV min) → V_SENSE(min) = 5 mV / 100 = 50 µV. At this level, measurement error remains <1% with proper layout and filtering - sufficient for 50 A through 1 mΩ shunts.

INA310B3QDGKRQ1 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

Amplifier Type:: Current Sense

Number of Circuits:: 1

Output Type:: Single-Ended

Slew Rate:: 2.5V/µs

Gain Bandwidth Product:: -

-3db Bandwidth:: 1 MHz

Current - Input Bias:: 20 µA

Voltage - Input Offset:: 30 µV

Current - Supply:: 1.6mA

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:: 8-VSSOP

INA310B3QDGKRQ1 FAQ

1.How can I place an order for INA310B3QDGKRQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for INA310B3QDGKRQ1 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 INA310B3QDGKRQ1 reliable?

The price and inventory of INA310B3QDGKRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA310B3QDGKRQ1 is usually 5 days.

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INA310B3QDGKRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your INA310B3QDGKRQ1 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 INA310B3QDGKRQ1?

For technical support, including INA310B3QDGKRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA310B3QDGKRQ1 requirements.

6.How does Aetrix verify that INA310B3QDGKRQ1 is sourced from the original manufacturer or authorized distributors?

All INA310B3QDGKRQ1 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 INA310B3QDGKRQ1 meets industry standards.

7.What is the process for return or replacement of INA310B3QDGKRQ1?

All INA310B3QDGKRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA310B3QDGKRQ1, 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 INA310B3QDGKRQ1 part is unused and in its original packaging.

Return procedure for INA310B3QDGKRQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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