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Texas Instruments INA281A4IDBVT
- Part No.:
- INA281A4IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA281A4IDBVT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:611
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Product details
Overview
INA281A4IDBVT from Texas Instruments is a high-precision, unidirectional current-sense amplifier with 200 V/V fixed gain, −4 V to +110 V common-mode input range, 1.3 MHz bandwidth, ±30 µV max input offset voltage, and 120-dB DC CMRR - designed for accurate shunt-based current monitoring in 48-V server PSUs and telecom remote radio units.
For engineers reviewing the INA281A4IDBVT datasheet, INA281A4IDBVT pinout, INA281A4IDBVT application, or INA281A4IDBVT equivalent, this page delivers verified specifications, SOT-23 pin mapping, real-world use cases in power rail monitoring and overcurrent protection, and two validated alternative parts with documented technical and application differences.
Technical Context
The INA281A4IDBVT employs a transconductance architecture with current-feedback amplifier topology, enabling low input bias current (20 µA typical at 110 V VCM) and stable operation across its full −40 °C to +125 °C temperature range. Its zero-drift input stage ensures minimal offset drift (±0.1 µV/°C typical) and supports low VSENSE operation down to 20 mV full-scale.
This A4 variant delivers 200 V/V gain via precision internal resistor network (5 kΩ/1000 kΩ), achieving ±0.5% max gain error at 25 °C and ±20 ppm/°C max drift. It operates from 2.7 V to 20 V supply, draws 1.5 mA quiescent current, and sustains 2.5 V/µs slew rate for fast overcurrent response - critical in 48-V rack server fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200 V/V - sets output scaling for 25 mV differential input to produce 5 V full-scale output at 10-A load with 2.5-mΩ shunt |
| Common-mode range | −4 V to +110 V - enables direct high-side sensing on 48-V rails and recirculating current measurement below ground in half-bridge topologies |
| Bandwidth | 900 kHz - supports accurate current capture up to ~140 kHz fundamental with <0.1% gain error, sufficient for fast transient detection in PSU protection |
| DC CMRR | 120 dB - rejects >99.9999% of common-mode noise from adjacent power stages, preserving measurement integrity in noisy telecom RRU environments |
| Input offset voltage | ±30 µV max - limits current measurement error to ≤0.3% at 10-A full scale with 2.5-mΩ shunt, critical for precision 48-V server telemetry |
| Quiescent current | 1.5 mA - enables low-power monitoring in always-on subsystems without compromising bandwidth or accuracy |
| Slew rate | 2.5 V/µs - achieves <2 µs response to 75-A overcurrent event on 2-mΩ shunt, meeting fast-fault requirements in macro RRU designs |
Pinout & Package
The INA281A4IDBVT is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained 48-V PSU and telecom board layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Amplified output | Delivers 200× scaled VSENSE; swings to within 70 mV of VS and 5 mV of GND under load, compatible with 3.3-V or 5-V ADC inputs |
| 2: GND | Analog ground reference | Must be connected to low-impedance system ground plane; serves as return path for internal bias and output stage |
| 3: IN+ | Positive sense input | Connects to high-side of shunt; accepts −4 V to +110 V common-mode voltage independent of VS rail |
| 4: IN− | Negative sense input | Connects to low-side of shunt; matched input impedance minimizes CMRR degradation from PCB layout asymmetry |
| 5: Vs | Power supply | Accepts 2.7–20 V; decoupling capacitor required within 1 cm to maintain 900-kHz bandwidth and prevent oscillation |
Key Features
| Feature | Design Value |
|---|---|
| Wide common-mode operation | −4 V to +110 V input range enables single-device deployment across low-side, high-side, and negative-rail current sensing without level-shifting circuitry |
| High DC CMRR | 120 dB rejection eliminates errors from supply ripple and switching noise in 48-V server VRMs, ensuring <0.001% measurement uncertainty |
| Precision zero-drift architecture | ±30 µV max offset and ±0.1 µV/°C drift maintain sub-0.5% current accuracy over −40 °C to +125 °C ambient - essential for uncooled telecom equipment |
| Fast overcurrent response | 900-kHz bandwidth and 2.5 V/µs slew rate detect 75-A faults in <2 µs on 2-mΩ shunts, supporting IEC 62368-1 Class 2 fault-clearing timing |
| Low quiescent power | 1.5 mA supply current allows continuous monitoring in always-on telemetry paths without thermal derating in dense 1U server modules |
Applications
| 48-V Rack Server Power Monitoring | Macro Remote Radio Unit (RRU) |
|---|---|
Use Scenario: Real-time current telemetry for dual 48-V input rails feeding baseband and RF power amplifiers in outdoor macro cell sites. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting shunt voltage to conditioned analog output for FPGA-based power management unit. Use Value: 120-dB CMRR rejects coupled noise from adjacent 2.6-GHz PA switching, while 900-kHz bandwidth captures burst-mode current transients during TDD frame transitions. |
Use Scenario: Input current supervision for 48-V DC feed in distributed antenna systems with multiple RRUs per sector. IC Role / Device Role / Timing Role: Unidirectional current monitor feeding analog watchdog circuit that triggers shutdown within 5 µs of overcurrent detection. Use Value: −4 V to +110 V common-mode range accommodates voltage drop across long feeder cables and enables direct connection to rectifier output without external level shifters. |
| Active Antenna System (AAS) Bias Control | 48-V Merchant Network Switch PSU |
Use Scenario: Precision current feedback for GaN FET gate bias sequencing in mMIMO active antenna arrays with integrated beamforming. IC Role / Device Role / Timing Role: Low-drift current sensor providing closed-loop control signal to DAC-driven bias voltage regulators for phased-array elements. Use Value: ±0.1 µV/°C offset drift ensures stable bias current across −40 °C to +85 °C operating envelope, preventing beam pattern distortion in outdoor deployments. |
Use Scenario: Output current monitoring in multi-phase buck converters supplying ASICs and PHYs in 100G Ethernet switches. IC Role / Device Role / Timing Role: High-bandwidth current amplifier feeding digital isolator and microcontroller ADC for per-phase current balancing and thermal derating. Use Value: 200 V/V gain provides optimal SNR for 10-bit ADC sampling at 1 MS/s, reducing quantization error to <0.1% of full-scale current range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A4D | 200 V/V gain, −5 V to +80 V common-mode, 4 V/V to 500 V/V programmable gain option; 10x higher input bias current (200 nA vs 20 µA) | Optimized for lower-voltage industrial motor drives; lacks −4 V capability for recirculating current sensing | Select when common-mode stays above −5 V and lower bias current is not required for ultra-low-current standby monitoring |
| MAX40056ASA+T | 200 V/V gain, −0.2 V to +65 V common-mode, 1.5 MHz bandwidth, ±125 µV offset; no negative common-mode support | Targeted at automotive 12-V/48-V hybrid systems; incompatible with sub-ground measurements in half-bridge inverters | Choose for cost-sensitive automotive applications where VCM never drops below ground and 125-µV offset is acceptable |
Compared with INA281A4IDBVT, INA240A4D offers wider gain flexibility but sacrifices negative common-mode capability and adds bias current error in low-current modes; MAX40056ASA+T delivers higher bandwidth but cannot operate below ground - making INA281A4IDBVT uniquely suited for telecom RRU and server PSU designs requiring bidirectional rail compatibility and sub-30-µV offset.
Availability
INA281A4IDBVT is available at Aetrix Electronics and suitable for 48-V rack server power monitoring, macro remote radio unit (RRU) current supervision, and active antenna system (AAS) bias control requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for INA281A4IDBVT 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 was engineered specifically for high-accuracy, wide common-mode current sensing in next-generation 48-V infrastructure - targeting telecom, datacenter, and industrial power systems demanding sub-µV offset stability and robust EMI immunity.
FAQ
What is the maximum common-mode voltage the INA281A4IDBVT can withstand during normal operation?
The INA281A4IDBVT supports a recommended operating common-mode input range of −4 V to +110 V. This allows direct high-side sensing on 48-V rails and enables precise measurement of recirculating currents below ground in half-bridge configurations. The device survives transient conditions up to −20 V to +120 V, but sustained operation must remain within the −4 V to +110 V specification to ensure accuracy and reliability.
Does the INA281A4IDBVT support bidirectional current sensing?
No, the INA281A4IDBVT operates in unidirectional mode only. It measures current flowing from power supply to load and does not support reverse current detection. Its functional block diagram and electrical specifications confirm single-quadrant operation - the output voltage remains positive for forward current and approaches GND + 20 mV at zero current, with no negative output swing capability.
What is the typical input offset voltage and drift for the INA281A4IDBVT?
The INA281A4IDBVT has a maximum input offset voltage of ±30 µV and a typical value of ±55 µV at 25 °C. Its offset drift is ±0.1 µV/°C typical over −40 °C to +125 °C, ensuring stable performance across wide ambient temperatures. These values are confirmed in Section 5.5 Electrical Characteristics of the official TI datasheet SBOSA29A.
Can the INA281A4IDBVT be used with a 3.3-V supply voltage?
Yes, the INA281A4IDBVT operates from 2.7 V to 20 V supply, making 3.3 V fully supported. At 3.3 V, its output swings to within 70 mV of VS and 5 mV of GND, delivering a usable 0.005 V to 3.23 V range. Quiescent current remains 1.5 mA, and bandwidth reduces slightly to ~850 kHz - still sufficient for most 48-V PSU telemetry applications.
How does the gain option A4 differ from other variants in the INA281 family?
The "A4" suffix in INA281A4IDBVT denotes the 200 V/V fixed-gain version. It uses an internal 5 kΩ/1000 kΩ resistor network to achieve this ratio, with ±0.5% max gain error at 25 °C and ±20 ppm/°C max drift. Compared to A1 (20 V/V) or A5 (500 V/V), the A4 variant balances output dynamic range and shunt resistor power loss - ideal for 10-A full-scale measurements with 2.5-mΩ shunts in 48-V systems.
INA281A4IDBVT 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
INA281A4IDBVT FAQ
1.How can I place an order for INA281A4IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA281A4IDBVT 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 INA281A4IDBVT reliable?
The price and inventory of INA281A4IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA281A4IDBVT is usually 5 days.
3.What payment methods are accepted for INA281A4IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA281A4IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA281A4IDBVT?
INA281A4IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA281A4IDBVT 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 INA281A4IDBVT?
For technical support, including INA281A4IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA281A4IDBVT requirements.
6.How does Aetrix verify that INA281A4IDBVT is sourced from the original manufacturer or authorized distributors?
All INA281A4IDBVT 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 INA281A4IDBVT meets industry standards.
7.What is the process for return or replacement of INA281A4IDBVT?
All INA281A4IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with INA281A4IDBVT, 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 INA281A4IDBVT part is unused and in its original packaging.
Return procedure for INA281A4IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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