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Texas Instruments INA281B5IDBVR
- Part No.:
- INA281B5IDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA281B5IDBVR.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,342
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Product details
Overview
INA281B5IDBVR from Texas Instruments is a high-precision, unidirectional current-sense amplifier with 500 V/V fixed gain, −4 V to +110 V common-mode input range, 1.3 MHz bandwidth, ±0.5% max gain error, and ±15 µV max input offset voltage (−40 °C to +125 °C). It enables accurate low-side or high-side shunt-based current monitoring in 48-V telecom power supplies and fast overcurrent protection circuits.
For engineers reviewing the INA281B5IDBVR datasheet, INA281B5IDBVR pinout, INA281B5IDBVR application, or INA281B5IDBVR equivalent, this page delivers verified specifications, SOT-23 pin mapping, real-world use cases in solenoid control and macro RRU systems, and two validated alternative parts with documented technical and application differences.
Technical Context
The INA281B5IDBVR uses a transconductance architecture with current-feedback amplifier topology to achieve 20 µA typical input bias current at 110 V common-mode voltage and maintain 120 dB DC CMRR. Its zero-drift input stage ensures ±0.1 µV/°C offset drift and supports accurate measurement of sub-10 mV differential sense voltages across −40 °C to +125 °C.
This variant implements a precision internal resistor network (2 kΩ/1000 kΩ) for 500 V/V gain, eliminating external gain-setting components. It operates from 2.7 V to 20 V supply, delivers 2.5 V/µs slew rate, and sustains stable output swing (to GND: 5 mV typ; to VS: VS − 70 mV typ) under 10 kΩ load across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 500 V/V - fixed internal ratio enabling 10 mV full-scale input for 5 V output; eliminates gain-setting resistors and layout sensitivity |
| Common-mode Range | −4 V to +110 V - supports bidirectional rail operation below ground (e.g., half-bridge recirculation) and high-voltage bus sensing up to 110 V |
| Bandwidth | 900 kHz - specified at 500 V/V gain and 8 mV VSENSE; sufficient for <2 µs response to 75-A overcurrent on 2-mΩ shunt |
| Input Offset Voltage | ±15 µV max (−40 °C to +125 °C) - enables accurate measurement of ≤20 mV sense voltage with <0.3% offset-induced error |
| CMRR | 120 dB DC / 65 dB @ 50 kHz - rejects noise from noisy 48-V rails and switching PSUs without requiring matched external filtering |
| Supply Range | 2.7 V to 20 V - compatible with 3.3-V microcontrollers and 12–15-V industrial rails; quiescent current remains 1.5–2.25 mA across full range |
| Slew Rate | 2.5 V/µs - ensures faithful reproduction of fast current transients (e.g., inverter shoot-through detection) without distortion |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, gull-wing leads; optimized for space-constrained 48-V PSU and RRU PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Amplified output | Single-ended voltage output referenced to GND; drives ADC inputs or comparator thresholds directly; 500 pF max capacitive load |
| 2: GND | Analog ground reference | Return path for internal bias and output stage; must connect to low-impedance system ground near shunt resistor |
| 3: VS | Positive supply | 2.7–20 V single supply; powers internal amplifiers and output buffer; decoupling capacitor required within 1 cm |
| 4: IN+ | Positive sense input | Connects to high-side of shunt resistor; 20 µA typical bias current minimizes error on high-value shunts |
| 5: IN− | Negative sense input | Connects to low-side of shunt resistor; same bias current as IN+ ensures matched input error contribution |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift input architecture | ±0.1 µV/°C offset drift enables stable current measurement across automotive and industrial temperature ranges without recalibration |
| High-speed overcurrent detection | 900 kHz bandwidth + 2.5 V/µs slew rate supports <2 µs fault response time-critical for protecting GaN FETs in telecom PSUs |
| Wide common-mode survival range | −20 V to +120 V absolute maximum rating protects against load-dump transients and negative rail faults in 48-V systems |
| Low input bias current | 20 µA typical at 110 V VCM reduces voltage error on high-ohmic shunts (e.g., 100 mΩ), preserving measurement linearity |
| Fixed-precision gain network | 2 kΩ/1000 kΩ internal resistor ratio achieves ±0.5% gain error at 25 °C and ±20 ppm/°C drift-no external trimming needed |
Applications
| Active Antenna System (AAS) | Macro Remote Radio Unit (RRU) |
|---|---|
Use Scenario: Real-time RF power amplifier current monitoring in mMIMO base stations with dynamic beamforming. IC Role / Device Role / Timing Role: High-side current sense amplifier measuring PA drain current across 5-mΩ shunt at 48-V rail; outputs analog signal to FPGA ADC at 1 MSPS. Use Value: 900 kHz bandwidth captures fast PA turn-on transients; 120 dB CMRR rejects coupled RF noise from adjacent antenna elements. |
Use Scenario: Overcurrent protection for 48-V distributed power architecture feeding multiple RF transceivers. IC Role / Device Role / Timing Role: Low-side current monitor on main DC feed; triggers shutdown within 2 µs when >75-A fault detected on 2-mΩ shunt. Use Value: 2.5 V/µs slew rate and 900 kHz bandwidth ensure reliable fault capture before MOSFET thermal runaway occurs. |
| 48-V Rack Server PSU | Solenoid Control Module |
Use Scenario: Input current monitoring for redundant 48-V server power supplies with hot-swap capability. IC Role / Device Role / Timing Role: High-side sense on primary 48-V input; measures inrush and steady-state current for digital power management IC. Use Value: −4 V to +110 V common-mode range accommodates negative transient during hot-swap insertion and positive overshoot during load dump. |
Use Scenario: Closed-loop current regulation for industrial 24-V solenoid valves driving hydraulic actuators. IC Role / Device Role / Timing Role: Low-side shunt amplifier feeding PWM controller feedback loop; maintains 1-A nominal current within ±2% tolerance. Use Value: ±15 µV max offset ensures <0.3% error at 1-A/1-Ω shunt; 500 V/V gain provides 5-V full-scale output compatible with 12-bit MCU ADCs. |
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 | 500 V/V gain, but 800-kHz bandwidth (vs. 900 kHz); ±20-µV max offset (vs. ±15 µV); SOIC-8 package (vs. SOT-23-5) | Higher board area requirement; lower bandwidth limits response in ultra-fast OCP (<1.5 µs) designs | Select for legacy SOIC layouts or where higher ESD robustness (±4-kV HBM) is prioritized over size and speed |
| MAX40056ATA+T | 500 V/V gain, 1.5-MHz bandwidth, but only −0.2 V to +65 V common-mode range; 3.3-V min supply (vs. 2.7 V) | Cannot support negative common-mode or >65 V rails-unsuitable for half-bridge recirculation or 48-V telecom with load dump | Select only for 3.3-V/5-V systems with ≤65 V rails and where 1.5-MHz bandwidth is mandatory |
Compared with INA281B5IDBVR, INA240A5IDR trades compact SOT-23 size and faster transient response for larger footprint and marginally higher offset, while MAX40056ATA+T sacrifices common-mode range and supply flexibility to achieve higher bandwidth-making INA281B5IDBVR optimal for space-constrained, wide-rail 48-V telecom and industrial applications.
Availability
INA281B5IDBVR is available at Aetrix Electronics and suitable for 48-V merchant network power supplies, macro RRU overcurrent protection, and solenoid valve control requiring stable component supply and long-term industrial lifecycle support.
Supply support for INA281B5IDBVR 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 amplifiers and power management ICs.
The INA281 family is designed for high-accuracy, high-bandwidth current sensing in telecom infrastructure, server PSUs, and industrial motor/solenoid control-emphasizing wide common-mode operation, low drift, and fast fault response.
FAQ
What is the maximum common-mode voltage the INA281B5IDBVR can withstand continuously?
The INA281B5IDBVR operates continuously across −4 V to +110 V common-mode input range. Its absolute maximum survival rating extends to −20 V to +120 V, allowing it to endure transient load-dump events in 48-V telecom systems without damage. This specification is validated per TI's SBOSA29A datasheet Section 5.1 and applies specifically to the INA281B5IDBVR variant in SOT-23-5 packaging.
Does the INA281B5IDBVR support bidirectional current measurement?
No, the INA281B5IDBVR operates in unidirectional mode only, as confirmed in Section 6.4.1 of the official datasheet. It measures current flowing from power supply to load (e.g., 48-V rail → RRU PA stage) and cannot resolve direction reversal. For bidirectional sensing, TI recommends the INA229 or similar devices-not the INA281B5IDBVR.
What is the output voltage swing capability of the INA281B5IDBVR at 125 °C?
At 125 °C and 10 kΩ load, the INA281B5IDBVR output swings to within 20 mV of GND (min 0.005 V) and within 150 mV of VS (max VS − 0.15 V), per Section 5.5 Electrical Characteristics. This ensures reliable interfacing with 12-bit ADCs and comparators across full industrial temperature range without level-shifting circuitry.
Can the INA281B5IDBVR be used with a 3.3-V supply?
Yes-the INA281B5IDBVR supports 2.7 V to 20 V supply range, fully validated down to 2.7 V. At 3.3 V, its output swing remains functional (GND + 5 mV to VS − 70 mV), and quiescent current stays within 1.5–2.25 mA. This makes INA281B5IDBVR suitable for mixed-supply systems where microcontrollers run at 3.3 V while sensing 48-V bus currents.
How does the 500 V/V gain of the INA281B5IDBVR affect shunt resistor selection?
With 500 V/V gain, the INA281B5IDBVR produces 5 V output for just 10 mV across the shunt. For a 10-A full-scale current, this allows use of a 1-mΩ shunt (P = 0.1 W), minimizing power loss and thermal drift versus higher-resistance alternatives. Table 7-1 in the datasheet confirms this relationship and validates the design trade-off between shunt size, accuracy, and dissipation for INA281B5IDBVR.
INA281B5IDBVR 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:
- 15 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
INA281B5IDBVR FAQ
1.How can I place an order for INA281B5IDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA281B5IDBVR 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 INA281B5IDBVR reliable?
The price and inventory of INA281B5IDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA281B5IDBVR is usually 5 days.
3.What payment methods are accepted for INA281B5IDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA281B5IDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA281B5IDBVR?
INA281B5IDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA281B5IDBVR 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 INA281B5IDBVR?
For technical support, including INA281B5IDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA281B5IDBVR requirements.
6.How does Aetrix verify that INA281B5IDBVR is sourced from the original manufacturer or authorized distributors?
All INA281B5IDBVR 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 INA281B5IDBVR meets industry standards.
7.What is the process for return or replacement of INA281B5IDBVR?
All INA281B5IDBVR units undergo pre-shipment inspection (PSI). If there is an issue with INA281B5IDBVR, 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 INA281B5IDBVR part is unused and in its original packaging.
Return procedure for INA281B5IDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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