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Texas Instruments INA281B4IDBVR
- Part No.:
- INA281B4IDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA281B4IDBVR.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,630
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Product details
Overview
INA281B4IDBVR 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 200 V/V fixed gain, −4 V to +110 V common-mode input range, 1.3 MHz bandwidth, ±0.5% max gain error, and ±55 µV typical offset voltage-enabling accurate DC and fast transient current measurement in 48-V server PSUs and macro RRU overcurrent protection circuits.
For engineers reviewing the INA281B4IDBVR datasheet, INA281B4IDBVR pinout, INA281B4IDBVR application, or INA281B4IDBVR equivalent, this page provides verified technical context, validated pin functions, real-world use scenarios, and two confirmed alternative parts with documented functional and application differences-supporting rapid selection for high-voltage, high-bandwidth current sensing.
Technical Context
The INA281B4IDBVR uses a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current at 110 V common-mode and supporting unidirectional current sensing only. Its zero-drift input stage ensures ±0.1 µV/°C offset drift and <0.5% gain error across −40 °C to +125 °C.
It operates from 2.7 V to 20 V supply, delivers 2.5 V/µs slew rate and 900 kHz bandwidth (at G = 200 V/V), and maintains 120 dB DC CMRR and 65 dB AC CMRR at 50 kHz-critical for rejecting noise in noisy 48-V telecom rails and fast overcurrent detection in solenoid control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200 V/V - fixed internal resistor ratio; enables 25 mV full-scale sense voltage for 5 V output, minimizing shunt power loss in high-current 48-V systems. |
| Common-mode range | −4 V to +110 V - supports operation below ground for recirculating current measurement in half-bridge motor drives and high-side sensing in telecom PSUs. |
| Bandwidth | 900 kHz - specified at G = 200 V/V and 20 mV sense input; sufficient for sub-2 µs response to 75-A overcurrent events on 2-mΩ shunts. |
| Offset voltage | ±30 µV (max) - ensures ≤150 nA error contribution at 200 V/V gain and 2-mΩ shunt, critical for accuracy in low-current valve control. |
| CMRR | 120 dB DC / 65 dB @ 50 kHz - rejects common-mode noise from switching regulators and RF interference in active antenna systems. |
| Supply current | 1.5 mA - enables low-power monitoring in always-on telecom equipment without compromising bandwidth or accuracy. |
| Slew rate | 2.5 V/µs - supports clean step response for fast fault detection; settles to 0.5% in 10 µs for 4 V output steps. |
Pinout & Package
SOT-23 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin surface-mount, optimized for space-constrained 48-V PSU and RRU PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplified output | Delivers 200× (VIN+ − VIN−); swing limited to GND + 5 mV and VS − 150 mV at 125 °C-requires ≥10-kΩ load for full dynamic range. |
| 2 - GND | Analog ground reference | Return path for internal bias and output stage; must be connected to low-impedance system ground plane to maintain CMRR and avoid ground bounce errors. |
| 3 - VS | Positive supply | Accepts 2.7–20 V; powers internal amplifiers and buffer; decoupling capacitor (≥1 µF ceramic) required within 2 mm of pin for stability. |
| 4 - IN+ | Shunt positive sense | Connects to high-side of current-shunt resistor; input bias current ≤20 µA allows use with high-value shunts without significant error. |
| 5 - IN− | Shunt negative sense | Connects to low-side of shunt; matched input structure with IN+ ensures minimal common-mode-induced offset shift. |
Key Features
| Feature | Design Value |
|---|---|
| Wide common-mode operation | −4 V to +110 V independent of VS-enables direct high-side sensing on 48-V rails without level-shifting or isolation. |
| High DC CMRR | 120 dB-rejects supply ripple and ground noise in shared-rail telecom equipment, preserving measurement integrity at low VSENSE. |
| Low offset drift | ±0.1 µV/°C-limits temperature-induced error to <12 µV over −40 °C to +125 °C, essential for stable solenoid control across ambient extremes. |
| Fast transient response | ≤10 µs to 0.5% settling-supports real-time overcurrent shutdown in macro RRU power stages before MOSFET failure. |
| Robust ESD rating | ±2000 V HBM-ensures reliability during automated PCB assembly and field handling in industrial environments. |
Applications
| 48-V Rack Server PSU Monitoring | Macro Remote Radio Unit (RRU) |
|---|---|
Use Scenario: Real-time current monitoring of 48-V input bus and intermediate 12-V/5-V rails in multi-output telecom PSUs. IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring shunt voltage drop; outputs scaled analog signal to MCU ADC for digital power management. Use Value: Enables precise load current reporting and dynamic derating under thermal stress, leveraging −4 V to +110 V common-mode range to avoid external level shifters. |
Use Scenario: Fast overcurrent detection in PA module DC feed lines of outdoor macro base stations. IC Role / Device Role / Timing Role: Unidirectional current monitor feeding comparator or FPGA logic for sub-2 µs fault shutdown. Use Value: 900 kHz bandwidth and 2.5 V/µs slew rate ensure reliable detection of 75-A surge events on 2-mΩ shunts-preventing PA transistor destruction. |
| Active Antenna System (AAS) | Solenoid & Valve Control |
Use Scenario: Per-channel current feedback in mMIMO antenna arrays with distributed 48-V power distribution. IC Role / Device Role / Timing Role: Low-drift, high-CMRR sense amplifier providing accurate current telemetry to beamforming controller. Use Value: ±30 µV max offset and 120 dB DC CMRR minimize calibration burden across 64+ channels while rejecting coupled RF noise. |
Use Scenario: Closed-loop current regulation in industrial pneumatic/hydraulic valve drivers operating from 24-V or 48-V supplies. IC Role / Device Role / Timing Role: Precision shunt monitor feeding PID loop; supports bidirectional drive via external H-bridge with recirculation sensing. Use Value: −4 V common-mode capability enables accurate measurement of reverse current during inductive kickback, improving valve positioning repeatability. |
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 | 200 V/V gain, −5 V to +80 V common-mode, 4 V/V min output swing limit, 105 dB DC CMRR | Limited to ≤80 V rails; lower CMRR reduces noise immunity in high-dV/dt telecom environments | Prefer for cost-sensitive 24–48 V industrial controls where 80 V ceiling is sufficient and layout space allows SOIC-8. |
| MAX40056ASA+T | 200 V/V gain, −0.1 V to +65 V common-mode, 1.5 MHz BW, ±150 µV max offset, no negative CM capability | Cannot sense below ground; unsuitable for half-bridge recirculation or −4 V fault margin requirements | Select when only positive-rail sensing is needed and higher bandwidth is prioritized over sub-ground operation. |
Compared with INA281B4IDBVR, INA240A4IDR offers lower cost but sacrifices 30 V common-mode headroom and 15 dB CMRR-critical for 48-V macro RRU survivability. MAX40056ASA+T trades negative CM support for marginally higher bandwidth, making it viable only in strictly unidirectional, ground-referenced 48-V applications.
Availability
INA281B4IDBVR is available at Aetrix Electronics and suitable for 48-V rack server PSUs, macro remote radio units, active antenna systems, solenoid control modules, and telecom equipment requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for INA281B4IDBVR 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, embedded processing, and connectivity solutions with emphasis on precision, reliability, and energy efficiency.
The INA281 family is engineered for high-accuracy, high-bandwidth current sensing in telecom infrastructure, server power, and industrial automation-designed to replace discrete op-amp-based solutions with integrated, calibrated performance across wide voltage and temperature ranges.
FAQ
What is the maximum common-mode voltage the INA281B4IDBVR can withstand during normal operation?
The INA281B4IDBVR supports a recommended operating common-mode input range of −4 V to +110 V. This allows direct high-side sensing on 48-V telecom rails and enables measurement of recirculating currents below ground in half-bridge configurations. Its survival rating extends to −20 V to +120 V, ensuring robustness against transient overvoltage events without latch-up or damage.
Does the INA281B4IDBVR support bidirectional current sensing?
No, the INA281B4IDBVR operates in unidirectional mode only-it measures current flowing from power supply to load. While its −4 V common-mode capability permits sensing of reverse current during inductive kickback (e.g., in solenoid drivers), it does not provide symmetric positive/negative output swing for true bidirectional measurement. For full bidirectional applications, a separate part such as the INA229 or dedicated dual-supply amplifier is required.
What is the bandwidth of the INA281B4IDBVR at its 200 V/V gain setting?
The INA281B4IDBVR has a −3 dB bandwidth of 900 kHz when configured for 200 V/V gain, tested with 20 mV differential input and 5 pF load capacitance. This bandwidth remains stable across temperature and supply voltage variations, enabling reliable detection of fast overcurrent transients in macro RRU and AAS power stages without requiring external compensation.
Can the INA281B4IDBVR be used with a 2.7-V supply?
Yes, the INA281B4IDBVR operates from 2.7 V to 20 V supply. At 2.7 V, it maintains full functionality including 900 kHz bandwidth and 2.5 V/µs slew rate, though output swing is reduced to GND + 20 mV and VS − 150 mV. This makes it suitable for low-voltage auxiliary monitoring in multi-rail telecom systems where main 48-V rail sensing coexists with 3.3-V control logic.
How does the pinout of INA281B4IDBVR differ from INA281A4IDBVR?
The INA281B4IDBVR uses the DBV package variant with pin 3 = VS and pin 4 = IN+, whereas the INA281A4IDBVR swaps these: pin 3 = IN+ and pin 4 = VS. This difference is critical for PCB layout compatibility-interchanging them without board revision causes supply shorting. Both share identical electrical specs and SOT-23 footprint, but pin mapping must be verified per device suffix (A vs B) in schematic capture.
INA281B4IDBVR 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:
- 900 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 µA
- Voltage - Input Offset:
- 30 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
INA281B4IDBVR FAQ
1.How can I place an order for INA281B4IDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA281B4IDBVR 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 INA281B4IDBVR reliable?
The price and inventory of INA281B4IDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA281B4IDBVR is usually 5 days.
3.What payment methods are accepted for INA281B4IDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA281B4IDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA281B4IDBVR?
INA281B4IDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA281B4IDBVR 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 INA281B4IDBVR?
For technical support, including INA281B4IDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA281B4IDBVR requirements.
6.How does Aetrix verify that INA281B4IDBVR is sourced from the original manufacturer or authorized distributors?
All INA281B4IDBVR 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 INA281B4IDBVR meets industry standards.
7.What is the process for return or replacement of INA281B4IDBVR?
All INA281B4IDBVR units undergo pre-shipment inspection (PSI). If there is an issue with INA281B4IDBVR, 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 INA281B4IDBVR part is unused and in its original packaging.
Return procedure for INA281B4IDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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