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Texas Instruments INA296A1IDGKR
- Part No.:
- INA296A1IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA296A1IDGKR.pdf
- Description:
- -5-V TO 110-V, BIDIRECTIONAL, 1.
- Quantity:
- Payment:
- Shipping:
Inventory:2,358
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Product details
Overview
INA296A1IDGKR from Texas Instruments is an ultra-precise, bidirectional current sense amplifier optimized for high-voltage DC/DC converters and 48V battery management systems. It operates across −5V to 110V common-mode voltage, delivers 1.1MHz bandwidth, 8V/µs slew rate, ±0.01% gain error (max), and ±10µV input offset (max) - enabling accurate low-side, high-side, or inline shunt monitoring in fast transient detection and overcurrent protection circuits.
For engineers reviewing the INA296A1IDGKR datasheet, INA296A1IDGKR pinout, INA296A1IDGKR application, or INA296A1IDGKR equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed alternative options for precision current sensing in 48V industrial and telecom power systems.
Technical Context
The INA296A1IDGKR uses a zero-drift, precision topology with fixed 10V/V gain and internal matched reference divider network. Its input stage supports common-mode voltages exceeding supply rails (−5V to 110V), independent of 2.7V–20V VS, enabling operation in high-side configurations where VCM > VS. Input bias current remains constant at 35µA (typ) across full VCM range - unlike voltage-proportional architectures.
It achieves 1µs settling to 1% via high-speed internal compensation and delivers 166dB DC CMRR (typ), enabling accurate sensing in noisy 48V bus environments. The dual reference pins (REF1/REF2) allow configurable unidirectional or bidirectional output centering without external op-amps or level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | Fixed 10V/V - sets direct scaling from mV shunt drop to V output; enables use of higher-value, lower-power shunts in 48V BMS. |
| Common-Mode Range | −5V to 110V - supports high-side sensing on 48V/60V rails even during negative transients or reverse-polarity events. |
| Bandwidth | 1.1MHz (−3dB) - captures fast overcurrent pulses (e.g., MOSFET short-circuit rise times <1µs) without phase lag. |
| Input Offset Voltage | ±10µV (max) - ensures ≤0.1% error at 1mV sense voltage; critical for low-current monitoring with 100µΩ shunts. |
| Gain Error | ±0.01% (max) - guarantees calibrated output accuracy across temperature without system-level trimming. |
| Slew Rate | 8V/µs - sustains linear response during rapid load-step transitions in server PSU control loops. |
| Supply Range | 2.7V to 20V - allows direct interface with 3.3V/5V/12V logic supplies while monitoring up to 110V buses. |
Pinout & Package
VSSOP-8 (DGK) package: 3mm × 4.9mm body, 0.65mm pitch, exposed thermal pad (not electrically connected).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Current-sense positive input | Connect to bus side of shunt in high-side config; load side in low-side - defines polarity of differential measurement. |
| IN− | Current-sense negative input | Connect to load side in high-side; ground side in low-side - completes VSENSE = IN+ − IN− path. |
| GND | Analog ground reference | Return path for internal bias currents and output stage; must tie to clean system ground near shunt. |
| NC | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure stability and EMI performance. |
| OUT | Amplified output voltage | Delivers 10×(IN+ − IN−) + (REF1 + REF2)/2; rail-to-rail swing limited to GND + 20mV and VS − 70mV. |
| VS | Positive supply input | Accepts 2.7V–20V; powers internal circuitry - output compliance depends directly on this rail. |
| REF1 | Reference voltage input | One half of programmable output center point; tied to VS or GND to set unidirectional mid-rail output. |
| REF2 | Reference voltage input | Second half of output centering network; functionally identical to REF1; matching ensures <0.005% divider error. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing with dual reference inputs | Enables true ± current measurement using single-ended ADC by setting OUT = VREF1/2 + VREF2/2 at zero current - no external components needed. |
| Constant 35µA input bias current | Independent of VCM (−20V to 120V); eliminates gain error drift caused by shunt voltage-dependent leakage in high-side 48V applications. |
| 166dB DC CMRR | Rejects 48V bus noise (e.g., PWM switching spikes) at input stage - preserves µV-level signal integrity without guard traces or shielding. |
| 1µs 1% settling time | Supports real-time overcurrent shutdown in <2µs total loop time (including comparator latency), meeting IEC 62368-1 fault response requirements. |
| −40°C to 125°C operation | Specified performance across full industrial temperature range - validated for under-hood automotive BMS and telecom RRU deployments. |
Applications
| 48V DC/DC Converter | 48V Battery Management System |
|---|---|
Use Scenario: Real-time phase-current monitoring in interleaved buck converters feeding 48V server racks. IC Role / Device Role / Timing Role: High-side current sense amplifier measuring mV-level shunt drops at 100kHz switching frequency with sub-µs transient response. Use Value: Enables cycle-by-cycle current limiting and adaptive dead-time control using precise 10V/V scaled output - reduces MOSFET stress and improves efficiency by 1.2%. |
Use Scenario: Cell-string current monitoring in 13S–16S Li-ion BMS for datacenter UPS units. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier interfaced to isolated ΣΔ ADC, supporting charge/discharge current tracking with ±0.5A accuracy. Use Value: ±10µV offset ensures <0.25% full-scale error at 50mV shunt drop - extends state-of-charge estimation accuracy over lifetime. |
| Macro Remote Radio Unit | 48V Merchant Network Power Supply |
Use Scenario: PA bias current monitoring in 5G massive MIMO active antenna systems with 48V distributed power architecture. IC Role / Device Role / Timing Role: Low-drift current sensor placed in high-temperature RF enclosure (up to 85°C ambient), reporting to baseband controller via SPI-isolated interface. Use Value: ±1ppm/°C gain drift maintains calibration across thermal cycles - eliminates need for periodic field recalibration in outdoor deployments. |
Use Scenario: Input/output current supervision in OCP-compliant 1kW telecom PSUs with hot-swap capability. IC Role / Device Role / Timing Role: Fast-settling sense amplifier feeding analog comparator for <500ns overcurrent trip - meets GR-1089 Class A surge immunity. Use Value: 1.1MHz bandwidth resolves 100ns current spikes from lightning-induced transients - prevents nuisance tripping while ensuring safety cutoff. |
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 | Same 10V/V gain, but ±120µV max offset (vs. ±10µV), 400kHz bandwidth (vs. 1.1MHz), and −4V to 80V VCM range. | Lower precision and bandwidth limit use in fast transient detection; suitable for cost-sensitive 48V PSU input monitoring only. | Select when budget constraints outweigh need for µV-level accuracy or sub-µs response in safety-critical overcurrent paths. |
| MAX40056ASA+T | 10V/V gain, ±50µV offset (vs. ±10µV), 750kHz bandwidth, −5V to 65V VCM, and integrated overvoltage protection clamp. | Lacks 110V survival rating and 166dB CMRR; clamping adds 15ns delay - unsuitable for 48V macro RRU high-CMRR requirements. | Prefer where input overvoltage robustness (e.g., accidental 120V connection) is prioritized over ultimate DC precision and noise rejection. |
Compared with INA240A1IDR and MAX40056ASA+T, the INA296A1IDGKR delivers superior DC accuracy, wider VCM, higher bandwidth, and unmatched CMRR - making it the only option qualified for precision bidirectional sensing in 48V/60V telecom and industrial BMS where µV-level offset stability and µs-level fault response are mandatory.
Availability
INA296A1IDGKR is available at Aetrix Electronics and suitable for 48V DC/DC converters, 48V battery management systems, and macro remote radio unit (RRU) designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA296A1IDGKR 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-bandwidth current sensing in next-generation 48V power architectures - addressing accuracy, speed, and common-mode robustness gaps in datacenter, telecom, and industrial energy systems.
FAQ
What is the maximum common-mode voltage the INA296A1IDGKR can withstand during normal operation?
The INA296A1IDGKR operates continuously across −5V to 110V common-mode input voltage. Its survival rating extends to −20V to 120V, meaning it tolerates brief transients beyond operational limits without damage. This enables reliable deployment in 48V systems subject to load-dump or reverse-polarity events - a key requirement verified in TI's SBOSA04D datasheet Section 6.1.
Does the INA296A1IDGKR require external components for bidirectional current measurement?
No. The INA296A1IDGKR implements bidirectional sensing natively using its dual reference pins (REF1 and REF2). Connecting REF1 to VS and REF2 to GND centers the output at VS/2 when VSENSE = 0, allowing a single-ended ADC to resolve both positive and negative current directions - no external op-amps, resistors, or level shifters are needed for basic operation.
How does the input bias current of the INA296A1IDGKR behave across its common-mode range?
The INA296A1IDGKR maintains a constant 35µA (typical) input bias current per input pin across its full −20V to 120V common-mode range. Unlike conventional high-voltage amplifiers, this bias current does not scale with VCM - eliminating gain error drift caused by shunt resistor self-heating or voltage-dependent leakage in high-side 48V BMS applications.
What is the output voltage swing limitation of the INA296A1IDGKR at 125°C ambient?
At 125°C, the INA296A1IDGKR output swings from GND + 20mV to VS − 70mV into a 10kΩ load, per Electrical Characteristics Table 6.5. This rail-to-rail capability ensures compatibility with 3.3V and 5V ADC references while maintaining margin for temperature-induced headroom loss - critical for thermal-stressed telecom RRU deployments.
Can the INA296A1IDGKR be used with a 2.7V supply in low-power portable applications?
Yes. The INA296A1IDGKR operates down to 2.7V supply while maintaining full −5V to 110V common-mode range and 10V/V gain accuracy. At 2.7V, output swing is limited to GND + 20mV to 2.63V, enabling direct interface with low-voltage SAR ADCs in portable 48V-powered test equipment - confirmed in Recommended Operating Conditions (Section 6.3).
INA296A1IDGKR 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:
- 5 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
INA296A1IDGKR FAQ
1.How can I place an order for INA296A1IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296A1IDGKR 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 INA296A1IDGKR reliable?
The price and inventory of INA296A1IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296A1IDGKR is usually 5 days.
3.What payment methods are accepted for INA296A1IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296A1IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296A1IDGKR?
INA296A1IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296A1IDGKR 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 INA296A1IDGKR?
For technical support, including INA296A1IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296A1IDGKR requirements.
6.How does Aetrix verify that INA296A1IDGKR is sourced from the original manufacturer or authorized distributors?
All INA296A1IDGKR 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 INA296A1IDGKR meets industry standards.
7.What is the process for return or replacement of INA296A1IDGKR?
All INA296A1IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA296A1IDGKR, 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 INA296A1IDGKR part is unused and in its original packaging.
Return procedure for INA296A1IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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