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Texas Instruments INA296B2IDR
- Part No.:
- INA296B2IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA296B2IDR.pdf
- Description:
- -5-V TO 110-V, BIDIRECTIONAL, 1.
- Quantity:
- Payment:
- Shipping:
Inventory:2,444
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Product details
Overview
INA296B2IDR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier optimized for 48V high-side or inline sensing in DC/DC converters and battery management systems. It operates over −5V to 110V common-mode voltage, delivers 20V/V fixed gain, 1.1MHz bandwidth, 8V/µs slew rate, and ±150µV max input offset voltage across −40°C to 125°C.
For engineers reviewing the INA296B2IDR datasheet, INA296B2IDR pinout, INA296B2IDR application, or INA296B2IDR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed application use cases, and two rigorously cross-checked alternative parts with documented functional and application differences.
Technical Context
The INA296B2IDR uses a zero-drift, precision topology enabling stable operation at high common-mode voltages (−5V to 110V) independent of its 2.7V–20V supply. Its 20V/V gain is factory-trimmed with ±0.1% max gain error and ±5ppm/°C drift, supporting accurate bidirectional current measurement down to microvolt-level VSENSE.
It achieves fast transient response via 1.1MHz small-signal bandwidth and 1µs 1% settling time, while maintaining 130dB typical CMRR and 35µA typical input bias current - constant across full common-mode range - enabling low-leakage, high-dynamic-range sensing in 48V server and telecom power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Common-mode range | −5V to 110V operational; enables direct high-side sensing on 48V bus without level-shifting or isolation. |
| Fixed gain | 20V/V; scales shunt voltage for optimal ADC utilization in 0–5V or 0–3.3V input ranges. |
| Bandwidth | 1.1MHz (−3dB); supports detection of sub-microsecond overcurrent transients in PSU protection circuits. |
| Input offset voltage | ±150µV max (25°C); ensures ≤7.5mV output error at 20V/V gain when sensing 0A through 1mΩ shunt. |
| Slew rate | 8V/µs; sustains linear output response during fast load-step events up to 400mA/µs di/dt into 10kΩ load. |
| Supply range | 2.7V to 20V; compatible with 3.3V, 5V, or 12V system rails while sensing beyond supply limits. |
| Operating temperature | −40°C to +125°C; qualified for under-hood automotive, industrial BMS, and telecom RRU environments. |
Pinout & Package
INA296B2IDR is packaged in SOIC-8 (D package), 4.9mm × 6mm body with standard 1.27mm pitch. Pin functions are identical across D, DDF, and DGK packages per TI SBOSA04D Rev D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN− (Pin 1) | Negative current-sense input | Connects to load side of shunt in high-side config; ground side in low-side config - defines differential measurement polarity. |
| GND (Pin 2) | Analog ground reference | Return path for internal circuitry; must be tied to system power ground with low-impedance connection 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., 0V for unidirectional, VS/2 for bidirectional). |
| NC (Pin 4) | No-connect terminal | Internally reserved; must be connected to GND per datasheet to ensure proper ESD performance and thermal stability. |
| OUT (Pin 5) | Amplified output | Delivers G×(VIN+−VIN−) + (VREF1+VREF2)/2; rail-to-rail capable within 20mV of GND and 200mV below VS. |
| VS (Pin 6) | Power supply input | Accepts 2.7V–20V; powers internal amplifiers and reference network; bypass capacitor required at pin for stability. |
| REF1 (Pin 7) | Reference voltage input | Second half of reference divider; identical function to REF2; both pins must be used together to configure unidirectional/bidirectional output centering. |
| IN+ (Pin 8) | Positive current-sense input | Connects to bus-voltage side of shunt in high-side config; load side in low-side config - completes differential pair. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing capability | Configurable output centering via REF1/REF2 allows true ± current measurement (e.g., charge/discharge in BMS) without external op-amps or level shifters. |
| Constant 35µA input bias current | Independent of common-mode voltage up to 110V - eliminates gain error drift caused by shunt leakage in high-voltage applications. |
| 1.1MHz bandwidth at all gains | Enables real-time monitoring of fast-switching 48V DC/DC converters (e.g., >500kHz phase-shifted topologies) without signal attenuation. |
| ±150µV max input offset | Supports accurate low-current sensing (e.g., <1A through 1mΩ shunt) while maintaining <0.1% full-scale error across temperature. |
| Survival rating: −20V to 120V | Withstands transient overvoltage events (e.g., load dump, inductive kickback) without latch-up or permanent damage in industrial 48V systems. |
Applications
| 48V DC/DC Converter Monitoring | 48V Battery Management System (BMS) |
|---|---|
Use Scenario: Real-time current monitoring in isolated 48V-to-12V buck-boost converters for AI server racks. IC Role / Device Role / Timing Role: High-side bidirectional current sense amplifier measuring input/output current with 1µs transient response for OCP triggering. Use Value: Enables cycle-by-cycle overcurrent protection and efficiency optimization using 20V/V gain and 1.1MHz bandwidth - no external signal conditioning required. | Use Scenario: Cell-level or pack-level current sensing in telecom 48V lithium-ion backup systems. IC Role / Device Role / Timing Role: Bidirectional amplifier with REF1/REF2 configured to VS/2, delivering centered output for charge/discharge state estimation. Use Value: ±150µV offset and −40°C to 125°C operation ensure <0.5% SOC error across environmental extremes without calibration. |
| Macro Remote Radio Unit (RRU) | 48V Merchant Network Power Supply |
Use Scenario: Input current supervision in outdoor 48V-powered macro base station RRUs exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: High-CMRR (130dB typ.) current sense amplifier rejecting RF-coupled noise on power feed lines while operating at −40°C to +85°C. Use Value: 130dB CMRR and constant 35µA bias current prevent false trips during burst-mode transmission, improving system uptime. | Use Scenario: Output current monitoring in multi-rail 48V merchant PSUs for cloud data centers. IC Role / Device Role / Timing Role: Low-drift (±5ppm/°C) 20V/V amplifier feeding precision ADC for telemetry and fault logging. Use Value: ±0.1% gain error and ±5ppm/°C drift eliminate need for per-unit gain calibration, reducing test time and BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2IDR | 20V/V gain, ±50µV max offset (A-grade), 4V/µs slew rate, 350kHz bandwidth, −4V to 80V common-mode. | Lower bandwidth and CMRR (120dB) limit use in fast transient detection; suitable for cost-sensitive 48V PSU where 1µs response not required. | Select for lower-cost, lower-bandwidth 48V monitoring where ±50µV offset and 350kHz suffice - not for RRU or fast OCP. |
| MAX40056ASA+T | 20V/V gain, ±125µV max offset, 1.5MHz bandwidth, 10V/µs slew rate, −5V to 65V common-mode, 2.7V–5.5V supply only. | Higher bandwidth but narrower common-mode range restricts use to low-side or isolated high-side configs; requires 3.3V supply. | Select when 1.5MHz bandwidth is critical and system common-mode stays ≤65V; avoid in 110V-tolerant 48V BMS front-end. |
Compared with INA296B2IDR, INA240A2IDR trades bandwidth and common-mode range for lower offset and cost, while MAX40056ASA+T offers higher speed but sacrifices high-voltage robustness and supply flexibility - making INA296B2IDR optimal for unisolated 48V high-side sensing demanding 1.1MHz fidelity and 110V tolerance.
Availability
INA296B2IDR 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 supervision requiring stable component supply and long-term industrial availability.
Supply support for INA296B2IDR 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 chain solutions.
The INA296x product line was designed specifically for high-accuracy, high-speed bidirectional current sensing in next-generation 48V power architectures - including server PSUs, telecom infrastructure, and electric vehicle auxiliary systems.
FAQ
What is the maximum common-mode voltage the INA296B2IDR can withstand continuously?
The INA296B2IDR supports continuous operation from −5V to 110V common-mode voltage per its recommended operating conditions. Its absolute maximum rating extends to −20V to 120V for survival during transients, such as load dump or inductive switching spikes. This makes INA296B2IDR suitable for direct connection to 48V bus lines with margin for overvoltage events without external protection.
Can the INA296B2IDR be used for low-side current sensing?
Yes, the INA296B2IDR supports low-side, high-side, and inline current sensing configurations. For low-side use, connect IN+ to the load side of the shunt and IN− to ground. Its −5V to 110V common-mode range accommodates ground-referenced inputs while maintaining accuracy, and REF1/REF2 can be tied to GND for unidirectional output swing from 0V upward.
What is the purpose of the NC pin (Pin 4) on the INA296B2IDR?
The NC pin (Pin 4) on the INA296B2IDR is internally reserved and must be connected to GND per the TI SBOSA04D datasheet. This connection ensures proper electrostatic discharge (ESD) protection, thermal dissipation, and functional stability - leaving it floating may compromise reliability or parametric performance in production systems.
How does the INA296B2IDR achieve bidirectional current measurement?
The INA296B2IDR achieves bidirectional current measurement by configuring its REF1 and REF2 pins to set the output's quiescent voltage. When REF1 = VS and REF2 = GND (or vice versa), the output centers at VS/2. Positive VSENSE drives output above VS/2; negative VSENSE drives it below - enabling full-scale measurement of both charge and discharge currents in BMS applications using a single INA296B2IDR.
Is the INA296B2IDR pin-compatible with other members of the INA296x family?
Yes, all INA296x variants - including INA296A1/A2/A3/A4/A5 and INA296B1/B2/B3/B4/B5 - share identical pinouts across SOIC-8 (D), VSSOP-8 (DGK), and SOT-23-8 (DDF) packages. The INA296B2IDR is functionally and physically interchangeable with INA296A2IDR or INA296B2DGK at the board level, differing only in grade-specific parameters like offset, drift, and CMRR.
INA296B2IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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-SOIC
INA296B2IDR FAQ
1.How can I place an order for INA296B2IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA296B2IDR 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 INA296B2IDR reliable?
The price and inventory of INA296B2IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA296B2IDR is usually 5 days.
3.What payment methods are accepted for INA296B2IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA296B2IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA296B2IDR?
INA296B2IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA296B2IDR 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 INA296B2IDR?
For technical support, including INA296B2IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA296B2IDR requirements.
6.How does Aetrix verify that INA296B2IDR is sourced from the original manufacturer or authorized distributors?
All INA296B2IDR 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 INA296B2IDR meets industry standards.
7.What is the process for return or replacement of INA296B2IDR?
All INA296B2IDR units undergo pre-shipment inspection (PSI). If there is an issue with INA296B2IDR, 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 INA296B2IDR part is unused and in its original packaging.
Return procedure for INA296B2IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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