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Texas Instruments INA296A4IDGKR
- Part No.:
- INA296A4IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA296A4IDGKR.pdf
- Description:
- -5-V TO 110-V, BIDIRECTIONAL, 1.
- Quantity:
- Payment:
- Shipping:
Inventory:1,330
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Product details
Overview
INA296A4IDGKR from Texas Instruments is an ultra-precise, bidirectional current sense amplifier optimized for 48V systems, featuring 100V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, 8V/µs slew rate, and ±10µV max input offset voltage. It enables high-accuracy DC and transient current monitoring in high-voltage power conversion stages.
For engineers reviewing the INA296A4IDGKR datasheet, INA296A4IDGKR pinout, INA296A4IDGKR application, or INA296A4IDGKR equivalent, this device supports fast overcurrent detection, low-shunt-power-loss designs, and precision bidirectional sensing in 48V BMS, DC/DC converters, and telecom RRU power rails.
Technical Context
The INA296A4IDGKR employs a zero-drift, high-common-mode topology that maintains ±10µV offset (max) and ±0.015% gain error (max) across −40°C to +125°C, with CMRR up to 166dB. Its input bias current remains constant at 35µA (typ) regardless of common-mode voltage - unlike conventional high-voltage amplifiers where bias current scales with VCM.
It operates from 2.7V–20V supply, delivers rail-to-rail output swing (within 20mV of GND and 70mV of VS), and achieves 1µs settling time to 1% for step responses - enabling real-time protection in fast-switching 48V PSU and server power architectures.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100V/V - sets output scaling for 10mV shunt drop → 1V output; optimizes dynamic range with low-ohmic shunts in 48V systems. |
| Common-mode range | −5V to 110V - supports high-side, low-side, and inline sensing beyond supply rails; enables direct connection to 48V bus without level-shifting. |
| Bandwidth | 1.1MHz - ensures faithful reproduction of fast current transients (e.g., MOSFET switching edges) for accurate overcurrent event capture. |
| Input offset voltage | ±10µV (max) - enables sub-10mA resolution with 1mΩ shunt at 48V, critical for precision battery charge/discharge monitoring. |
| Slew rate | 8V/µs - sustains linear output response during rapid current surges (e.g., short-circuit events), avoiding distortion in protection loop timing. |
| CMRR | 166dB (typ) - rejects noise from noisy 48V bus (e.g., PWM ripple, EMI) while preserving µV-level differential signal integrity. |
| Supply range | 2.7V to 20V - decouples operation from system bus voltage; allows use with local 3.3V or 5V LDOs even in 48V environments. |
Pinout & Package
VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected). Compatible with standard 8-pin surface-mount reflow profiles and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Negative current-sense input | Connects to load side (high-side) or ground side (low-side) of shunt; defines polarity for bidirectional output swing. |
| GND (Pin 2) | Analog ground reference | Return path for internal circuitry; must be tied to clean system ground plane near shunt to minimize noise coupling. |
| REF2 (Pin 3) | Reference voltage input | One half of internal reference divider; paired with REF1 to set output mid-point (e.g., VS/2 for bidirectional operation). |
| 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 100×(VIN+−VIN−) + (VREF1+VREF2)/2; drives ADC inputs or comparator thresholds directly. |
| VS (Pin 6) | Positive supply | Accepts 2.7V–20V; powers internal amplifier and reference network; bypass capacitor required at pin. |
| REF1 (Pin 7) | Reference voltage input | Second half of reference divider; identical function to REF2; both pins must be biased within 0V–VS range. |
| IN+ (Pin 8) | Positive current-sense input | Connects to bus side (high-side) or load side (low-side) of shunt; completes differential measurement path. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Configurable unidirectional or bidirectional output via REF1/REF2 voltage pairing - enables single-device current direction + magnitude detection in BMS cell balancing. |
| Zero-drift architecture | ±0.1µV/°C offset drift ensures <±1µV total offset shift over −40°C to +125°C - eliminates calibration drift in rack-mounted telecom equipment. |
| Constant input bias current | 35µA (typ) independent of VCM - avoids gain error variation when sensing across wide bus voltages (e.g., −5V to 110V), unlike competitive solutions. |
| Fast transient response | 1µs settling to 1% enables detection of sub-microsecond overcurrent events in 48V server PSUs - critical for MOSFET gate driver interlock timing. |
| High CMRR at frequency | 105dB at 50kHz - suppresses PWM switching noise from adjacent 48V buck converters without external filtering, reducing BOM count. |
Applications
| 48V Battery Management System (BMS) | 48V DC/DC Converter Monitoring |
|---|---|
Use Scenario: Real-time bidirectional current measurement across series-connected Li-ion cells in datacenter rack batteries. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, rail-independent analog feedback to MCU ADC for charge/discharge control and SOC estimation. Use Value: ±10µV offset enables ≤5mA current resolution with 2mΩ shunt, supporting precise coulomb counting over full temperature range without recalibration. | Use Scenario: Input/output current monitoring in 48V-to-12V intermediate bus converter for AI accelerator cards. IC Role / Device Role / Timing Role: Fast-response current sensor feeding protection logic and digital power controller for cycle-by-cycle current limiting. Use Value: 1.1MHz bandwidth captures switching-edge current spikes; 1µs settling ensures accurate peak-current detection before next PWM cycle. |
| Macro Remote Radio Unit (RRU) | 48V Rack Server Power Distribution |
Use Scenario: Monitoring PA module supply current in outdoor 5G macro base stations operating from −40°C to +85°C ambient. IC Role / Device Role / Timing Role: Bidirectional amplifier interfaced to isolated sigma-delta ADC for telemetry and fault logging in telecom infrastructure. Use Value: 166dB CMRR rejects coupled RF noise from nearby transceivers; −5V to 110V range accommodates negative transient excursions during lightning surge events. | Use Scenario: Per-rail current sensing on 48V backplane supplying multiple server nodes in hyperscale data centers. IC Role / Device Role / Timing Role: Precision current monitor feeding PMBus-compliant digital power management IC for load-line optimization and hot-swap sequencing. Use Value: 100V/V gain provides full-scale output with 0.5mΩ shunt, minimizing I²R loss (<250mW at 50A) while maintaining 12-bit effective resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A4IDR | 100V/V gain, −4V to 80V common-mode, 4V/µs slew rate, ±12µV offset (max), SOIC-8 only | Limited to ≤80V systems; lower bandwidth (350kHz) and slower response unsuitable for fast transient detection in 48V PSUs | Select when cost sensitivity outweighs need for >80V operation or sub-µs protection timing. |
| MAX40056ATA+T | 100V/V gain, −5V to 65V common-mode, 1.5MHz bandwidth, ±15µV offset (max), 8V/µs slew rate, 8-WLP package | Lower common-mode ceiling restricts use in 48V systems with high-voltage transients; WLP footprint limits thermal dissipation in high-current rails | Prefer for space-constrained, lower-transient industrial applications where 65V VCM suffices. |
Compared with INA240A4IDR and MAX40056ATA+T, the INA296A4IDGKR uniquely combines 110V common-mode tolerance, 1.1MHz bandwidth, and ±10µV offset in a thermally enhanced VSSOP-8 package - making it the only option qualified for precision, high-speed 48V telecom and server power monitoring under full industrial temperature range.
Availability
INA296A4IDGKR is available at Aetrix Electronics and suitable for 48V battery management systems, 48V DC/DC converters, and macro remote radio unit (RRU) power monitoring requiring stable component supply and long-term production continuity.
Supply support for INA296A4IDGKR 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 for industrial, automotive, and communications markets.
The INA296x product line was designed specifically for ultra-precise, high-bandwidth current sensing in next-generation 48V power architectures - addressing accuracy, speed, and common-mode range limitations of legacy current sense amplifiers.
FAQ
What is the maximum common-mode voltage the INA296A4IDGKR can withstand during normal operation?
The INA296A4IDGKR supports a continuous operational common-mode input range of −5V to 110V. This allows direct connection to 48V buses with headroom for transients and negative excursions, such as those seen in telecom RRU power supplies. The device also survives up to −20V to 120V in non-operational conditions, per absolute maximum ratings.
Does the INA296A4IDGKR require external calibration to maintain accuracy over temperature?
No, the INA296A4IDGKR does not require external calibration. Its zero-drift architecture ensures input offset voltage drift is limited to ±0.1µV/°C and gain error drift to ±1 ppm/°C over −40°C to +125°C. These specifications guarantee ±10µV offset and ±0.015% gain error across the full temperature range without user intervention - critical for unattended 48V BMS deployments.
Can the INA296A4IDGKR be used for unidirectional current sensing only?
Yes, the INA296A4IDGKR supports unidirectional operation by connecting both REF1 and REF2 pins to either GND (ground-referenced output) or VS (supply-referenced output). In this mode, the output swings from near-GND or near-VS proportional to current magnitude and direction is inferred from polarity - simplifying interface with single-supply ADCs in 48V server power distribution units.
What is the recommended power supply bypassing for the INA296A4IDGKR?
Texas Instruments specifies a minimum 1µF X7R ceramic capacitor placed within 2mm of the VS and GND pins of the INA296A4IDGKR, plus a 0.1µF capacitor in parallel for high-frequency noise suppression. This configuration ensures stable operation under fast load transients in 48V DC/DC converter feedback loops and prevents oscillation due to PCB trace inductance.
How does the INA296A4IDGKR's input bias current behave at high common-mode voltages?
The INA296A4IDGKR maintains a constant typical input bias current of 35µA per input pin across its entire −5V to 110V common-mode range - unlike many high-voltage amplifiers where bias current increases linearly with VCM. This constancy prevents gain error drift and ensures predictable shunt resistor loading in 48V BMS and telecom power applications, even during voltage surges.
INA296A4IDGKR 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:
- 3 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
INA296A4IDGKR FAQ
1.How can I place an order for INA296A4IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296A4IDGKR 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 INA296A4IDGKR reliable?
The price and inventory of INA296A4IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296A4IDGKR is usually 5 days.
3.What payment methods are accepted for INA296A4IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296A4IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296A4IDGKR?
INA296A4IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296A4IDGKR 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 INA296A4IDGKR?
For technical support, including INA296A4IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296A4IDGKR requirements.
6.How does Aetrix verify that INA296A4IDGKR is sourced from the original manufacturer or authorized distributors?
All INA296A4IDGKR 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 INA296A4IDGKR meets industry standards.
7.What is the process for return or replacement of INA296A4IDGKR?
All INA296A4IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA296A4IDGKR, 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 INA296A4IDGKR part is unused and in its original packaging.
Return procedure for INA296A4IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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