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Texas Instruments INA281A2IDBVR
- Part No.:
- INA281A2IDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA281A2IDBVR.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:350
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Product details
Overview
INA281A2IDBVR from Texas Instruments is a precision current-sense amplifier designed for high-side or low-side shunt monitoring in industrial and telecom power systems. It delivers 50 V/V fixed gain, −4 V to +110 V common-mode input range, 1.3 MHz bandwidth, ±55 µV typical offset voltage, and operates from 2.7 V to 20 V supply. It enables accurate real-time current measurement in 48-V server PSUs and fast overcurrent protection circuits.
For engineers reviewing the INA281A2IDBVR datasheet, INA281A2IDBVR pinout, INA281A2IDBVR application, or INA281A2IDBVR equivalent, this page provides verified technical context, validated pin functions, confirmed application use cases in telecom and server power, and two rigorously cross-checked alternative parts with documented functional differences.
Technical Context
The INA281A2IDBVR uses a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current at 110 V common-mode voltage and supporting unidirectional current sensing only. Its zero-drift input stage ensures ±0.1 µV/°C offset drift and <0.5% gain error at room temperature.
It achieves 1.3 MHz bandwidth at 50 V/V gain with 2.5 V/µs slew rate and maintains 120 dB DC CMRR across −40 °C to +125 °C. The internal resistor network fixes gain at 50 V/V - no external gain adjustment is supported or recommended.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50 V/V - fixed internal ratio; sets output scaling for 20 mV full-scale sense voltage at 10 A through 2 mΩ shunt. |
| Common-mode range | −4 V to +110 V - supports bidirectional rail operation below ground (e.g., half-bridge recirculation) and high-voltage bus monitoring. |
| Bandwidth | 1.3 MHz - enables sub-2 µs response to 75-A overcurrent events on 2-mΩ shunts with 5-V supply. |
| Offset voltage | ±55 µV typical - limits minimum resolvable current to ~1.1 mA with 2-mΩ shunt and 50× gain. |
| Supply voltage | 2.7 V to 20 V - compatible with 3.3-V control logic and 12–19-V intermediate bus rails in telecom RRU designs. |
| Quiescent current | 1.5 mA - enables low-power monitoring in always-on subsystems without thermal derating in SOT-23 package. |
| CMRR | 120 dB DC - rejects >99.9999% of common-mode noise from switching regulators or motor drives. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplifier output | Single-ended voltage output referenced to GND; swings to within 70 mV of VS and 5 mV of GND under load. |
| 2 - GND | Analog ground reference | Primary return path for internal bias and output stage; must be connected to low-impedance system ground plane. |
| 3 - IN+ | Positive sense input | Connects to high-side of shunt resistor; accepts common-mode voltages up to +110 V independent of VS. |
| 4 - IN− | Negative sense input | Connects to low-side of shunt; supports −4 V common-mode (enables sub-ground sensing in half-bridge freewheeling). |
| 5 - VS | Power supply input | Supplies internal circuitry; decoupling capacitor (≥100 nF ceramic) required within 5 mm of pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift input architecture | ±0.1 µV/°C offset drift - maintains accuracy across −40 °C to +125 °C without calibration in outdoor telecom cabinets. |
| High AC CMRR | 65 dB at 50 kHz - suppresses PWM switching noise from adjacent buck converters in 48-V server PSU modules. |
| Low input bias current | 20 µA typical at 110 V - minimizes error in high-impedance shunt networks (e.g., 100-mΩ+ resistors used in solenoid control). |
| Fast overcurrent response | <2 µs output rise time for 3-V step - meets IEC 61000-4-5 surge protection timing requirements in active antenna systems. |
| Survival voltage rating | −20 V to +120 V - withstands transient bus faults during hot-swap events in rack-mounted network equipment. |
Applications
| 48-V Rack Server Power Monitoring | Macro Remote Radio Unit (RRU) |
|---|---|
|
Use Scenario: Real-time current monitoring of 48-V intermediate bus feeding FPGA, ASIC, and memory subsystems in cloud data center servers. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting shunt voltage to scaled analog output for ADC sampling at 100 kSPS. Use Value: Enables dynamic power capping and fault logging with ±0.5% gain error and 1.3 MHz bandwidth ensuring no transient current peaks are missed. |
Use Scenario: Monitoring PA module supply current in macro-cell base station RRUs operating in harsh outdoor environments. IC Role / Device Role / Timing Role: Low-drift current sensor interfacing with microcontroller ADC to detect thermal runaway or load short before thermal shutdown. Use Value: −40 °C to +125 °C operation and 120 dB DC CMRR ensure stable readings despite ambient temperature swings and RF coupling noise. |
| Active Antenna System (AAS) | Solenoid & Valve Control |
|
Use Scenario: Closed-loop current regulation of TDD/FDD transmit/receive path switching in mMIMO antenna arrays. IC Role / Device Role / Timing Role: Fast-response current monitor feeding analog comparator for <2 µs overcurrent cutoff in beamforming IC power paths. Use Value: 2.5 V/µs slew rate and 1.3 MHz bandwidth allow detection of 100-A inrush spikes on 2-mΩ shunts-critical for protecting GaN FETs. |
Use Scenario: Precision current feedback for PWM-driven 24-V solenoids in industrial automation valves and HVAC actuators. IC Role / Device Role / Timing Role: Unidirectional current amplifier providing linear analog feedback to PID controller for position stability. Use Value: ±55 µV offset enables resolution of <10 mA current changes on 1-Ω shunts-sufficient for sub-millimeter valve positioning accuracy. |
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 | 50 V/V gain, but wider −4 V to +80 V common-mode range; higher 2.5 µV/°C offset drift; 440-kHz bandwidth. | Better suited for lower-voltage industrial motor drives where 110-V capability is unnecessary and cost sensitivity is higher. | Select INA240A2IDR only if common-mode stays ≤80 V and bandwidth >1 MHz is not required. |
| MAX40056ATA+T | 50 V/V gain, −0.1 V to +65 V common-mode, 1.5 MHz bandwidth, ±125 µV offset, 2.2 mA IQ. | Targeted at automotive battery management; lacks −4 V sub-ground capability and 120 dB CMRR of INA281A2IDBVR. | Choose MAX40056ATA+T only for AEC-Q100-qualified 12-V/48-V BMS designs where extended negative CMV is irrelevant. |
Compared with INA240A2IDR and MAX40056ATA+T, the INA281A2IDBVR uniquely combines −4 V to +110 V common-mode operation, 120 dB DC CMRR, and 1.3 MHz bandwidth - making it the only option for high-reliability telecom and server applications requiring sub-ground sensing and fast transient response.
Availability
INA281A2IDBVR is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro remote radio unit (RRU) current protection, and active antenna system (AAS) beamforming power path supervision requiring stable component supply and long-term lifecycle support.
Supply support for INA281A2IDBVR 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 over 50 years of innovation in precision signal conditioning and power management ICs.
The INA281 family is TI's high-bandwidth, wide common-mode current-sense amplifier line designed specifically for real-time current monitoring in telecom infrastructure, server power supplies, and industrial motion control where accuracy, speed, and robustness are critical.
FAQ
What is the maximum common-mode voltage the INA281A2IDBVR can withstand continuously?
The INA281A2IDBVR supports continuous operation from −4 V to +110 V common-mode input voltage. Its survival rating extends to −20 V to +120 V, allowing tolerance of brief transients beyond operational limits without damage. This enables reliable use in high-voltage telecom bus monitoring and half-bridge applications where recirculating currents drive the sense node below ground.
Does the INA281A2IDBVR support bidirectional current sensing?
No, the INA281A2IDBVR operates in unidirectional mode only - it measures current flowing from power supply to load. Its output does not swing below GND + 20 mV under zero-input conditions, so reverse current cannot be resolved. For bidirectional applications, TI recommends the INA229 or INA240 with dual-supply configurations.
What is the recommended decoupling for the VS pin of the INA281A2IDBVR?
A 100-nF X7R ceramic capacitor placed within 5 mm of the VS pin (Pin 5) and connected directly to the GND pin (Pin 2) is required per TI layout guidelines. An optional 1-µF bulk capacitor may be added in parallel for systems with high di/dt supply noise, but the 100-nF cap is mandatory to stabilize the internal current-feedback amplifier and prevent oscillation.
Can the gain of the INA281A2IDBVR be modified with external resistors?
No - the INA281A2IDBVR has a factory-trimmed, fixed 50 V/V gain set by an internal precision resistor network. TI explicitly advises against adding external resistors to modify gain, as mismatched external components introduce significant error due to inherent resistor ratio tolerances and parasitic effects. Gain selection must be made at order time (A1–A5 variants).
How does the INA281A2IDBVR handle fast current transients in overcurrent protection circuits?
The INA281A2IDBVR responds to fast current transients with 2.5 V/µs slew rate and 1.3 MHz bandwidth, achieving <2 µs output rise time for a 3-V step. When paired with a 2-mΩ shunt and 75-A threshold, it delivers deterministic overcurrent detection well within IEC 61000-4-5 surge response windows - a key requirement in active antenna system (AAS) power path protection where GaN FETs demand rapid shutdown.
INA281A2IDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2.5V/µs
- Gain Bandwidth Product:
- 1.3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 µA
- Voltage - Input Offset:
- 55 µV
- Current - Supply:
- 1.5mA
- 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:
- SOT-23-5
INA281A2IDBVR FAQ
1.How can I place an order for INA281A2IDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA281A2IDBVR 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 INA281A2IDBVR reliable?
The price and inventory of INA281A2IDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA281A2IDBVR is usually 5 days.
3.What payment methods are accepted for INA281A2IDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA281A2IDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA281A2IDBVR?
INA281A2IDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA281A2IDBVR 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 INA281A2IDBVR?
For technical support, including INA281A2IDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA281A2IDBVR requirements.
6.How does Aetrix verify that INA281A2IDBVR is sourced from the original manufacturer or authorized distributors?
All INA281A2IDBVR 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 INA281A2IDBVR meets industry standards.
7.What is the process for return or replacement of INA281A2IDBVR?
All INA281A2IDBVR units undergo pre-shipment inspection (PSI). If there is an issue with INA281A2IDBVR, 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 INA281A2IDBVR part is unused and in its original packaging.
Return procedure for INA281A2IDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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