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Home > Products > Integrated Circuits (ICs) > Linear > Instrumentation, Op Amps, Buffer Amps

Texas Instruments INA296B1IDGKR

Name: INA296B1IDGKR
Brand: Texas Instruments
SKU: INA296B1IDGKR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: INA296B1IDGKR

Manufacturer:: Texas Instruments

Category:: Instrumentation, Op Amps, Buffer Amps

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

Datasheet:: INA296B1IDGKR.pdf

Description:: -5-V TO 110-V, BIDIRECTIONAL, 1.

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Product details

Overview

INA296B1IDGKR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier with 10V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, and ±150µV max input offset voltage. It operates from 2.7V to 20V supply and delivers fast 1µs settling (to 1%) for high-speed overcurrent detection in 48V BMS and DC/DC converters.

For engineers reviewing the INA296B1IDGKR datasheet, INA296B1IDGKR pinout, INA296B1IDGKR application, or INA296B1IDGKR equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options for precision high-voltage current sensing designs.

Technical Context

The INA296B1IDGKR uses a zero-drift, high-common-mode topology enabling accurate bidirectional sensing across −5V to 110V independent of its 2.7V–20V supply rail. Its 35µA typical input bias current remains constant over full V_CM, eliminating voltage-dependent leakage errors in low-shunt applications.

It features dual reference inputs (REF1/REF2) that configure output mid-point for bidirectional operation or rail-referenced output for unidirectional use. The 10V/V gain version supports precise low-V_SENSE measurement down to millivolt-level shunt drops while maintaining ±0.1% gain error and 166dB CMRR at DC.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain	10V/V - fixed ratio; converts 10mV shunt drop to 100mV output, enabling high-resolution ADC interfacing with minimal signal conditioning.
Common-mode Range	−5V to 110V - supports high-side, low-side, and inline sensing in 48V systems with negative rail tolerance and transient survival up to 120V.
Bandwidth	1.1MHz - enables detection of sub-microsecond current transients, critical for fast overcurrent protection in switch-mode power supplies.
Offset Voltage	±150µV max - ensures <±15mA error on 10mΩ shunt at room temperature; drift of ±0.5µV/°C maintains accuracy across −40°C to 125°C.
CMRR	130dB min - rejects >99.99% of common-mode noise from noisy 48V bus, preserving signal integrity in EMI-heavy telecom and server environments.
Supply Range	2.7V to 20V - allows direct operation from 3.3V, 5V, or 12V rails without LDO; output swings within 20mV of GND and 200mV below VS.
Quiescent Current	3.2mA max - enables always-on monitoring in battery-backed BMS without excessive standby drain.

Pinout & Package

VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected), RoHS-compliant, moisture sensitivity level 2a.

Pin/Terminal	Circuit Role	Design Meaning
IN− (Pin 1)	Negative current-sense input	Connects to load side (high-side) or ground side (low-side); differential pair with IN+ defines V_SENSE.
GND (Pin 2)	Analog ground reference	Primary return path for internal circuitry; must be low-impedance connection to system ground plane.
REF2 (Pin 3)	Reference voltage input	One of two matched inputs setting output mid-point; tied to GND or VS for unidirectional mode; paired with REF1 for bidirectional offset control.
NC (Pin 4)	No-connect terminal	Internally reserved; must be connected to GND per datasheet to ensure stability and ESD robustness.
OUT (Pin 5)	Amplified output	Delivers G×V_SENSE + (REF1+REF2)/2; drives 10kΩ loads with rail-to-rail swing capability.
V_S (Pin 6)	Positive supply	Accepts 2.7V–20V; powers internal amplifiers and reference network; bypass capacitor required at pin.
REF1 (Pin 7)	Reference voltage input	Matches REF2; forms precision divider with REF2 to set output baseline; no functional difference between REF1 and REF2.
IN+ (Pin 8)	Positive current-sense input	Connects to bus-voltage side (high-side) or load side (low-side); completes differential sensing path with IN−.

Key Features

Feature	Design Value
Bidirectional sensing	Configurable via REF1/REF2 to measure current flow in either direction-enables charge/discharge monitoring in 48V BMS without external polarity switching.
Constant input bias current	35µA typical, independent of V_CM - eliminates gain error drift caused by shunt resistor self-heating or bus voltage variation in high-accuracy applications.
Low V_SENSE operation	Accurate down to 0mV differential - supports ultra-low-resistance shunts (<1mΩ) for high-current, low-loss measurement in server PSUs and RRU power stages.
Fast transient response	1µs to 1% settling - captures rapid fault events such as short-circuit turn-on in <1µs, enabling hardware-based protection before controller intervention.
High CMRR at frequency	105dB at 50kHz - maintains rejection of high-frequency switching noise from adjacent MOSFETs or gate drivers in compact DC/DC layouts.

Applications

48V Battery Management System	48V DC/DC Converter
Use Scenario: Real-time bidirectional current monitoring during charging and discharging of 48V Li-ion packs in datacenter rack UPS units. IC Role / Device Role / Timing Role: High-side current sense amplifier measuring shunt voltage across 0.5mΩ resistor; outputs analog signal to MCU ADC with 16-bit effective resolution. Use Value: ±150µV offset enables <±15mA absolute current error at 25°C, supporting SOC estimation accuracy within ±0.5% over full temperature range.	Use Scenario: Fast overcurrent detection in 48V→12V synchronous buck converter for macro RRU base stations. IC Role / Device Role / Timing Role: Inline current monitor placed between high-side FET and inductor; triggers hardware shutdown within 1µs of fault onset. Use Value: 1.1MHz bandwidth and 1µs settling allow detection of sub-cycle current spikes before energy dissipation exceeds safe limits.
Test & Measurement Equipment	48V Rack Server Power Distribution
Use Scenario: Precision current sourcing and sinking verification in programmable DC electronic loads rated for 48V/100A operation. IC Role / Device Role / Timing Role: Low-side shunt amplifier feeding calibrated DAC feedback loop; operates across −5V to 110V common-mode to handle reverse-polarity test modes. Use Value: ±0.1% gain error and ±5ppm/°C drift ensure traceable calibration across lab temperature variations without recalibration.	Use Scenario: Per-rail current telemetry in 48V intermediate bus architecture for AI accelerator servers with multiple GPU power domains. IC Role / Device Role / Timing Role: High-side monitor on each 48V→0.8V VRM input; outputs to PMBus-compatible ADC for real-time power mapping and thermal derating. Use Value: 130dB CMRR suppresses noise from adjacent high-dI/dt VRMs, enabling stable current readouts under full GPU load transients.

48V Battery Management System

48V DC/DC Converter

Use Scenario: Real-time bidirectional current monitoring during charging and discharging of 48V Li-ion packs in datacenter rack UPS units.

IC Role / Device Role / Timing Role: High-side current sense amplifier measuring shunt voltage across 0.5mΩ resistor; outputs analog signal to MCU ADC with 16-bit effective resolution.

Use Value: ±150µV offset enables <±15mA absolute current error at 25°C, supporting SOC estimation accuracy within ±0.5% over full temperature range.

Use Scenario: Fast overcurrent detection in 48V→12V synchronous buck converter for macro RRU base stations.

IC Role / Device Role / Timing Role: Inline current monitor placed between high-side FET and inductor; triggers hardware shutdown within 1µs of fault onset.

Use Value: 1.1MHz bandwidth and 1µs settling allow detection of sub-cycle current spikes before energy dissipation exceeds safe limits.

Test & Measurement Equipment

48V Rack Server Power Distribution

Use Scenario: Precision current sourcing and sinking verification in programmable DC electronic loads rated for 48V/100A operation.

IC Role / Device Role / Timing Role: Low-side shunt amplifier feeding calibrated DAC feedback loop; operates across −5V to 110V common-mode to handle reverse-polarity test modes.

Use Value: ±0.1% gain error and ±5ppm/°C drift ensure traceable calibration across lab temperature variations without recalibration.

Use Scenario: Per-rail current telemetry in 48V intermediate bus architecture for AI accelerator servers with multiple GPU power domains.

IC Role / Device Role / Timing Role: High-side monitor on each 48V→0.8V VRM input; outputs to PMBus-compatible ADC for real-time power mapping and thermal derating.

Use Value: 130dB CMRR suppresses noise from adjacent high-dI/dt VRMs, enabling stable current readouts under full GPU load transients.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
INA240A1IDR	10V/V gain, −4V to 80V V_CM, ±120µV V_OS, 400kHz BW, SOIC-8 only	Limited to 80V max V_CM; insufficient for 110V surge-tolerant designs or negative-rail systems	Select when cost-sensitive, lower-bandwidth 48V BMS is acceptable and 110V operation not required.
MAX40056ATA+T	10V/V gain, −0.1V to 65V V_CM, ±100µV V_OS, 1.5MHz BW, 8-WLP package	Lower V_CM ceiling; no negative voltage support; WLP package unsuitable for manual rework or high-reliability industrial use	Choose for space-constrained telecom modules where 65V V_CM suffices and ultra-small footprint is mandatory.

Compared with INA240A1IDR and MAX40056ATA+T, the INA296B1IDGKR uniquely supports −5V to 110V common-mode operation with 1.1MHz bandwidth and VSSOP-8 packaging-making it the only option for ruggedized, bidirectional 48V+ systems requiring both negative-rail compatibility and microsecond fault response.

Availability

INA296B1IDGKR is available at Aetrix Electronics and suitable for 48V battery management systems, 48V DC/DC converters, and telecom remote radio unit (RRU) power monitoring requiring stable component supply and long-term industrial availability.

Supply support for INA296B1IDGKR 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 delivering analog and embedded processing solutions, with deep expertise in precision signal chain and high-reliability power management ICs.

The INA296x family was designed specifically for ultra-precise, high-speed bidirectional current sensing in next-generation 48V infrastructure-targeting datacenter power, EV charging, and 5G telecom equipment where accuracy, speed, and wide common-mode range are non-negotiable.

FAQ

What is the maximum common-mode voltage the INA296B1IDGKR can withstand during normal operation?

The INA296B1IDGKR operates continuously across a common-mode input range of −5V to 110V. This specification applies under recommended operating conditions (TA = −40°C to 125°C, VS = 2.7V to 20V). Its survival rating extends to −20V to 120V, but sustained operation above 110V or below −5V is outside guaranteed specifications. The INA296B1IDGKR achieves this using an internal topology decoupled from supply voltage, enabling true high-side sensing in 48V systems with negative transients.

Can the INA296B1IDGKR be used for unidirectional current sensing, and how is it configured?

Yes, the INA296B1IDGKR supports unidirectional operation by connecting both REF1 and REF2 pins to the same rail-either GND for ground-referenced output or VS for supply-referenced output. When referenced to GND, a positive V_SENSE produces an upward output swing; when referenced to VS, a negative V_SENSE produces a downward swing. This configuration eliminates the need for external level-shifting circuitry in single-direction applications like motor phase current monitoring or DC load current measurement. The INA296B1IDGKR maintains its full accuracy and bandwidth in either mode.

What is the purpose of the NC pin (Pin 4) on the INA296B1IDGKR VSSOP-8 package?

Pin 4 of the INA296B1IDGKR is designated NC (No Connect) but must be externally connected to GND per the official Texas Instruments datasheet. This connection is required for proper ESD protection, thermal stability, and functional reliability-not optional. Leaving Pin 4 floating may degrade CMRR, increase susceptibility to latch-up, or cause parametric shifts under high dV/dt conditions. The INA296B1IDGKR datasheet explicitly states "Reserved. Connect to ground." for this terminal.

How does the INA296B1IDGKR achieve stable performance despite varying common-mode voltage?

The INA296B1IDGKR uses a proprietary high-voltage input stage with constant 35µA typical input bias current across its full −20V to 120V common-mode range. Unlike conventional current sense amplifiers whose bias current scales with V_CM, this architecture prevents gain error drift and offset shift due to shunt resistor self-heating or bus voltage modulation. Combined with 166dB DC CMRR and 105dB CMRR at 50kHz, the INA296B1IDGKR maintains measurement fidelity in noisy, high-dV/dt environments such as 48V server PSUs-where competing devices exhibit significant V_CM-dependent errors.

Is the INA296B1IDGKR pin-compatible with other members of the INA296x family?

Yes, all INA296x variants-including INA296B1IDGKR, INA296A1IDGKR, and other gain versions (B2/B3/B4/B5)-share identical pinout, package dimensions, and electrical interface across DDF (SOT-23-8), DGK (VSSOP-8), and D (SOIC-8) packages. This allows direct substitution within the same package footprint when changing gain or precision grade, provided layout accommodates thermal and noise requirements of the selected variant. The INA296B1IDGKR's VSSOP-8 pin map matches INA296A1IDGKR exactly, enabling drop-in replacement for cost-optimized designs where ±150µV offset is acceptable versus ±10µV in the 'A' grade.

INA296B1IDGKR 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:: 8V/µs

Gain Bandwidth Product:: -

-3db Bandwidth:: 1.1 MHz

Current - Input Bias:: 35 µA

Voltage - Input Offset:: 25 µV

Current - Supply:: 2.5mA

Current - Output / Channel:: -

Voltage - Supply Span (Min):: 2.7 V

Voltage - Supply Span (Max):: 20 V

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-VSSOP

INA296B1IDGKR FAQ

1.How can I place an order for INA296B1IDGKR through Aetrix?

Please submit a Request for Quotation (RFQ) for INA296B1IDGKR 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 INA296B1IDGKR reliable?

The price and inventory of INA296B1IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296B1IDGKR is usually 5 days.

3.What payment methods are accepted for INA296B1IDGKR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296B1IDGKR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for INA296B1IDGKR?

INA296B1IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your INA296B1IDGKR 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 INA296B1IDGKR?

For technical support, including INA296B1IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296B1IDGKR requirements.

6.How does Aetrix verify that INA296B1IDGKR is sourced from the original manufacturer or authorized distributors?

All INA296B1IDGKR 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 INA296B1IDGKR meets industry standards.

7.What is the process for return or replacement of INA296B1IDGKR?

All INA296B1IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA296B1IDGKR, 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 INA296B1IDGKR part is unused and in its original packaging.

Return procedure for INA296B1IDGKR:

1.Submit a request within 90 days.

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

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