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Texas Instruments INA296A5IDDFR
- Part No.:
- INA296A5IDDFR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA296A5IDDFR.pdf
- Description:
- -5-V TO 110-V, BIDIRECTIONAL, 1.
- Quantity:
- Payment:
- Shipping:
Inventory:2,488
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Product details
Overview
INA296A5IDDFR from Texas Instruments is an ultra-precise, bidirectional current sense amplifier with 200V/V fixed gain, −5V to 110V common-mode input range, 1.1MHz bandwidth, 8V/µs slew rate, and ±10µV max offset voltage-designed for high-speed, high-voltage DC/DC converter current monitoring in 48V server power supplies.
For engineers reviewing the INA296A5IDDFR datasheet, INA296A5IDDFR pinout, INA296A5IDDFR application, or INA296A5IDDFR equivalent, this page delivers verified technical context, real-world use cases, validated alternatives, and supply-chain support tailored for precision power-system design and BMS implementation.
Technical Context
The INA296A5IDDFR employs a zero-drift, high-common-mode topology enabling accurate bidirectional sensing across −5V to 110V independent of its 2.7V–20V supply. Its 1.1MHz small-signal bandwidth and 1µs 1% settling time support fast overcurrent detection in transient-rich 48V PSU rails.
With ±0.015% max gain error (±2 ppm/°C drift) and 166dB CMRR, it maintains precision under high dV/dt noise conditions. Input bias current remains stable at 35µA typ across full common-mode range-critical for low-leakage shunt measurement in battery management systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200V/V - enables high-resolution sensing with low-value shunts (e.g., 0.5mΩ), minimizing I²R loss in 48V/100A+ systems. |
| Common-Mode Range | −5V to 110V - supports direct high-side sensing on 48V bus without level-shifting, even during negative transients or startup undershoot. |
| Bandwidth | 1.1MHz - captures sub-microsecond current spikes for real-time OCP in digital power controllers. |
| Offset Voltage | ±10µV max - ensures ≤50nA error at 0.5mΩ shunt, critical for standby current accuracy in rack servers. |
| Slew Rate | 8V/µs - sustains linear output response during fast load steps (e.g., CPU burst currents), avoiding distortion in feedback loops. |
| Supply Range | 2.7V to 20V - compatible with 3.3V or 5V control rails while monitoring up to 110V bus voltages. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive BMS and industrial 48V RRU deployments. |
Pinout & Package
INA296A5IDDFR is housed in an 8-pin SOT-23 (DDF) package measuring 2.9mm × 2.8mm, optimized for space-constrained 48V PSU PCB layouts with thermal resistance RθJA = 129.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Negative current-sense input | Connects to load side of shunt in high-side config or ground side in low-side config; handles −5V to 110V common-mode. |
| GND (Pin 2) | Analog ground reference | System ground return for internal circuitry; must be low-impedance to preserve CMRR and offset stability. |
| REF2 (Pin 3) | Reference voltage input | One of two matched inputs setting output mid-point; tied to GND or VS for unidirectional operation, or split for bidirectional. |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure ESD robustness and noise immunity. |
| OUT (Pin 5) | Amplified output | Delivers 200×(VIN+−VIN−) + (VREF1+VREF2)/2; swings within 20mV of GND and 70mV below VS. |
| VS (Pin 6) | Power 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-enables rail-to-rail bidirectional output centering. |
| IN+ (Pin 8) | Positive current-sense input | Connects to bus-voltage side of shunt in high-side config or load side in low-side config; same CM range as IN−. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Supports both charge and discharge current measurement in 48V BMS via configurable REF1/REF2 mid-supply biasing. |
| Ultra-low offset drift | ±0.1µV/°C max - maintains <±1µV total offset shift over −40°C to +125°C, eliminating recalibration in thermal-cycling environments. |
| Stable input bias current | 35µA typ, constant across −20V to +120V survival range - avoids gain error from shunt leakage in high-impedance sensing paths. |
| High-speed transient response | 1µs to 1% settling - enables cycle-by-cycle current limiting in synchronous buck converters operating above 500kHz. |
| Integrated reference architecture | Dual matched REF pins allow precise output centering without external op-amps or resistors-reducing layout sensitivity and component count. |
Applications
| 48V DC/DC Converter Monitoring | 48V Battery Management System |
|---|---|
Use Scenario: Real-time phase-current sensing in multiphase VRMs powering AI accelerators in rack servers. IC Role / Device Role / Timing Role: High-side current sense amplifier providing isolated, high-bandwidth analog feedback to digital PWM controller. Use Value: 1.1MHz bandwidth and 1µs settling enable accurate current reconstruction during 100ns pulse-width modulation edges, improving load-transient regulation. | Use Scenario: Bidirectional cell-string current monitoring in telecom 48V LiFePO₄ backup systems. IC Role / Device Role / Timing Role: Precision shunt amplifier interfacing with 16-bit ADC in BMS microcontroller for Coulomb counting. Use Value: ±10µV offset and ±0.015% gain error ensure ≤0.5% SoC error over lifetime, even at −40°C cold-start conditions. |
| Macro Remote Radio Unit (RRU) | 48V Merchant Network Power Supply |
Use Scenario: PA bias current monitoring in 5G massive MIMO base stations with rapid thermal cycling. IC Role / Device Role / Timing Role: Low-drift current sensor feeding analog watchdog circuit for immediate PA shutdown on overcurrent. Use Value: 166dB CMRR rejects coupled RF noise from adjacent TX chains, preventing false OCP triggers during full-power transmission. | Use Scenario: Input/output current supervision in OCP-certified 48V–12V intermediate bus converters for white-box switches. IC Role / Device Role / Timing Role: High-common-mode amplifier delivering fault signal to system manager IC via analog comparator input. Use Value: −5V to 110V operational range covers worst-case inrush and lightning surge events without external protection clamping. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A5IDR | 200V/V gain, but ±120µV max offset and 400kHz bandwidth; uses different zero-drift architecture. | Lower precision and speed-suitable for cost-sensitive, non-critical 48V PSU monitoring where 1% current accuracy suffices. | Select when budget constraints outweigh need for sub-0.1% gain error or µs-level transient response. |
| MAX40056ASA+T | 200V/V gain, ±15µV offset, 800kHz bandwidth, 5V-only supply; no dual-reference pin architecture. | Lacks REF1/REF2 flexibility-requires external level-shifting for true bidirectional output in 48V systems with 3.3V ADCs. | Choose only if supply rail is fixed at 5V and bidirectional centering can be handled externally with minimal added components. |
Compared with INA240A5IDR and MAX40056ASA+T, the INA296A5IDDFR delivers superior DC precision (10× lower offset), higher bandwidth (1.1MHz vs ≤800kHz), and integrated bidirectional output configuration-making it the optimal choice for next-generation 48V infrastructure demanding <0.02% total current measurement error.
Availability
INA296A5IDDFR is available at Aetrix Electronics and suitable for 48V DC/DC converter monitoring, 48V battery management systems (BMS), and macro remote radio unit (RRU) power integrity applications requiring stable component supply and long-term production continuity.
Supply support for INA296A5IDDFR 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 decades of expertise in precision signal conditioning and high-voltage interface solutions.
The INA296x product line was engineered specifically for ultra-precise, high-speed bidirectional current sensing in 48V–110V power architectures-including datacenter PSUs, EV auxiliary systems, and 5G infrastructure-where traditional amplifiers fail due to CMRR degradation or bandwidth collapse.
FAQ
What is the maximum common-mode voltage the INA296A5IDDFR can withstand during normal operation?
The INA296A5IDDFR operates reliably across a common-mode input range of −5V to 110V. This allows direct connection to 48V bus rails-even during negative transients like load dump or cold-cranking-without external attenuation or level-shifting circuitry. The device survives up to −20V and 120V per absolute maximum ratings, but sustained operation outside −5V–110V may impact accuracy or reliability. INA296A5IDDFR's architecture decouples common-mode tolerance from supply voltage, enabling robust performance in noisy, high-dV/dt environments typical of switched-mode power supplies.
How does the dual-reference pin architecture (REF1 and REF2) of the INA296A5IDDFR enable bidirectional current sensing?
The INA296A5IDDFR uses REF1 and REF2 to set the output baseline voltage precisely at their average: VOUT = 200×(VIN+−VIN−) + (VREF1 + VREF2)/2. For bidirectional operation, REF1 is tied to VS and REF2 to GND, centering the output at VS/2-so positive current drives output above VS/2 and negative current drives it below. This eliminates need for external op-amps or resistor dividers. INA296A5IDDFR's matched internal reference network ensures <±0.01% divider error, preserving measurement symmetry across full temperature range.
Can the INA296A5IDDFR be used with a 3.3V supply while monitoring a 48V bus?
Yes-the INA296A5IDDFR operates from 2.7V to 20V supply, and its common-mode input range (−5V to 110V) is fully independent of VS. With a 3.3V supply, the output swings from ~20mV above GND to ~70mV below 3.3V (i.e., up to 3.23V), which interfaces cleanly with 3.3V SAR ADCs. Critical design considerations include using a low-ESR 1µF ceramic bypass capacitor at VS, routing IN+/IN− differentially away from noisy power traces, and grounding NC (Pin 4) solidly. INA296A5IDDFR maintains 166dB CMRR and 1.1MHz bandwidth regardless of supply voltage.
What is the typical input bias current of the INA296A5IDDFR, and why is it important for shunt-based sensing?
The INA296A5IDDFR exhibits a typical input bias current of 35µA per input (IN+ and IN−), and crucially, this value remains constant across its entire −20V to +120V common-mode range. Unlike many high-voltage amplifiers whose bias current scales with VCM, this stability prevents gain error from shunt-resistor loading-especially critical when using low-value shunts (e.g., 0.25mΩ) in high-current 48V systems. For example, at 100A load, 35µA bias introduces only 3.5nΩ effective series resistance error-negligible versus typical shunt tolerances. INA296A5IDDFR's architecture ensures this performance is maintained from −40°C to +125°C.
How does the 1.1MHz bandwidth of the INA296A5IDDFR improve overcurrent protection in modern DC/DC converters?
The 1.1MHz small-signal bandwidth of the INA296A5IDDFR enables faithful reproduction of fast current transients-such as those occurring during MOSFET switching edges or sudden load steps-without phase lag or amplitude attenuation. In a 500kHz synchronous buck converter, this allows the control loop to detect overcurrent within one switching cycle (<2µs), triggering immediate PWM blanking or shutdown. Combined with 1µs 1% settling time, INA296A5IDDFR supports cycle-by-cycle current limiting that protects GaN FETs from avalanche failure. This responsiveness is unattainable with legacy 100–400kHz current sense amplifiers.
INA296A5IDDFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 8V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.1 MHz
- Current - Input Bias:
- 35 µA
- Voltage - Input Offset:
- 2 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:
- TSOT-23-8
INA296A5IDDFR FAQ
1.How can I place an order for INA296A5IDDFR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296A5IDDFR 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 INA296A5IDDFR reliable?
The price and inventory of INA296A5IDDFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296A5IDDFR is usually 5 days.
3.What payment methods are accepted for INA296A5IDDFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296A5IDDFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296A5IDDFR?
INA296A5IDDFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296A5IDDFR 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 INA296A5IDDFR?
For technical support, including INA296A5IDDFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296A5IDDFR requirements.
6.How does Aetrix verify that INA296A5IDDFR is sourced from the original manufacturer or authorized distributors?
All INA296A5IDDFR 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 INA296A5IDDFR meets industry standards.
7.What is the process for return or replacement of INA296A5IDDFR?
All INA296A5IDDFR units undergo pre-shipment inspection (PSI). If there is an issue with INA296A5IDDFR, 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 INA296A5IDDFR part is unused and in its original packaging.
Return procedure for INA296A5IDDFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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