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Texas Instruments INA281A1IDBVT
- Part No.:
- INA281A1IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA281A1IDBVT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:6,187
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Product details
Overview
INA281A1IDBVT 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 20 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.
For engineers reviewing the INA281A1IDBVT datasheet, INA281A1IDBVT pinout, INA281A1IDBVT application, or INA281A1IDBVT equivalent, this device supports unidirectional sensing with rail-to-rail output swing capability, low 20 µA input bias current at 110 V VCM, and operation from 2.7 V to 20 V supply - critical for high-voltage, high-accuracy, high-speed current monitoring in space-constrained SOT-23 layouts.
Technical Context
The INA281A1IDBVT uses a transconductance architecture with current-feedback amplifier topology, enabling low input bias current (20 µA typ at 110 V) and high CMRR (120 dB DC, 65 dB at 50 kHz). Its zero-drift input stage ensures stable offset performance across −40 °C to +125 °C.
This variant implements a fixed 20 V/V gain via internal precision resistor network (R1 = 25 kΩ, RL = 500 kΩ), eliminating external gain-setting components. The device operates unidirectionally and requires ≥20 mV output voltage to remain in linear region under zero-current conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V - fixed internal ratio optimized for 250-mV full-scale VSENSE at 5-V output |
| Common-Mode Range | −4 V to +110 V - supports below-ground sensing in half-bridge recirculation and high-side 48-V/110-V bus monitoring |
| Bandwidth | 1.3 MHz - enables sub-2-µs response to 75-A overcurrent events on 2-mΩ shunts |
| DC CMRR | 120 dB - rejects >99.9999% of common-mode voltage error in noisy power rails |
| Offset Voltage | ±55 µV typical - contributes ≤1.1 µA error at 25-mΩ shunt, critical for low-current accuracy |
| Slew Rate | 2.5 V/µs - sustains fast output transitions without distortion during inrush detection |
| Supply Range | 2.7 V to 20 V - compatible with 3.3-V control logic and 12–20-V auxiliary rails |
Pinout & Package
The INA281A1IDBVT is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts in telecom and server power modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplified output | Delivers 20×(VIN+ − VIN−); swings to within 70 mV of VS and 5 mV of GND at 10-kΩ load |
| 2 - GND | Analog ground reference | Return path for internal bias and output stage; must be low-impedance connection to system ground plane |
| 3 - IN+ | Positive shunt sense input | Connects to high-side of current-sense resistor; 20-µA bias current flows into pin |
| 4 - IN− | Negative shunt sense input | Connects to low-side of shunt; matched 20-µA bias current minimizes differential error |
| 5 - VS | Power supply input | Accepts 2.7–20 V; supplies internal amplifiers and output buffer; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| Wide common-mode operation | −4 V to +110 V enables direct sensing on 48-V, 54-V, and 110-V buses without level-shifting or isolation |
| High DC CMRR | 120 dB eliminates error from rail noise in telecom RRU and active antenna systems |
| Low offset drift | ±0.1 µV/°C typical ensures <1.5 µV total drift over −40 °C to +125 °C - critical for thermal-stable PSU monitoring |
| Fast transient response | 1.3-MHz bandwidth + 2.5 V/µs slew rate supports real-time overcurrent shutdown in <2 µs |
| Low quiescent current | 1.5 mA at 5 V allows integration into always-on monitoring paths without significant power penalty |
Applications
| 48-V Rack Server Monitoring | Macro Remote Radio Unit (RRU) |
|---|---|
Use Scenario: Real-time current monitoring of 48-V backplane distribution and CPU VRM output stages. IC Role / Device Role / Timing Role: High-side current-sense amplifier converting mV-level shunt voltage to robust 0–5 V analog signal for ADC or comparator input. Use Value: Enables precise load profiling and early fault detection using 25-mΩ shunt with ≤1.1 µA offset-induced error at full scale. | Use Scenario: Overcurrent protection for PA bias circuits and power amplifiers in outdoor macro base stations. IC Role / Device Role / Timing Role: Fast-response current monitor feeding digital isolator or FPGA logic for <2-µs trip decision on 75-A surge. Use Value: Leverages 1.3-MHz bandwidth and 2.5 V/µs slew rate to detect inrush before damage occurs - validated per TI Table 6-2. |
| Solenoid Control Feedback | Telecom Equipment Power Management |
Use Scenario: Closed-loop current regulation of 24-V solenoid valves in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Low-drift unidirectional amplifier providing feedback to PWM controller for coil current stabilization. Use Value: ±55 µV offset and ±0.1 µV/°C drift ensure <0.5% current error across operating temperature - essential for repeatable actuation force. | Use Scenario: Input current supervision for AC/DC front-end and DC/DC intermediate bus converters in NEBS-compliant telecom shelves. IC Role / Device Role / Timing Role: High-common-mode amplifier interfacing directly to 110-V rectified bus for system-level power health reporting. Use Value: −4 V to +110 V VCM range permits direct connection without external attenuators or isolated amplifiers - reducing BOM count and layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDR | Automotive-grade (AEC-Q100), 20 V/V gain, 800-kHz bandwidth, ±120-µV max offset | Designed for automotive battery management; higher offset and lower bandwidth than INA281A1IDBVT | Select when AEC-Q100 qualification is mandatory and 800-kHz response suffices |
| MAX40056ASA+ | 20 V/V gain, 1.5-MHz bandwidth, ±150-µV max offset, 2.7–5.5-V supply only | Optimized for low-voltage, high-speed applications; lacks −4-V to +110-V VCM range | Select when supply is strictly ≤5.5 V and ultra-fast 1.5-MHz response is prioritized over wide VCM |
Compared with INA240A1QDR and MAX40056ASA+, the INA281A1IDBVT uniquely combines 1.3-MHz bandwidth, −4 V to +110 V common-mode range, and ±55 µV typical offset - making it optimal for high-voltage, high-accuracy, high-speed current sensing where automotive qualification or sub-3-V operation is not required.
Availability
INA281A1IDBVT is available at Aetrix Electronics and suitable for 48-V rack server monitoring, macro remote radio unit (RRU) protection, and telecom equipment power management requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for INA281A1IDBVT 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 for industrial, automotive, and communications markets.
The INA281 product line is engineered for precision high-voltage current sensing in telecom infrastructure, server power supplies, and industrial motor controls - emphasizing wide VCM, low drift, and fast transient response.
FAQ
What is the maximum common-mode voltage the INA281A1IDBVT can withstand during normal operation?
The INA281A1IDBVT operates continuously over a common-mode input range of −4 V to +110 V. Its survival rating extends to −20 V to +120 V, but functional operation is guaranteed only within the −4 V to +110 V range per recommended operating conditions. This allows direct interface to 48-V, 54-V, and 110-V power rails without attenuation or level-shifting circuitry - a key advantage of the INA281A1IDBVT in high-voltage monitoring applications.
Does the INA281A1IDBVT support bidirectional current sensing?
No, the INA281A1IDBVT operates in unidirectional mode only, as confirmed in Section 6.4.1 of its datasheet. It measures current flowing from power supply to load and cannot accurately resolve reverse or recirculating current polarity. For bidirectional applications, TI recommends the INA229 or INA240 families. The INA281A1IDBVT's design focuses on high-speed, high-accuracy forward current detection - such as overcurrent protection in RRU PA stages.
What is the output voltage swing capability of the INA281A1IDBVT at 5 V supply?
At VS = 5 V and TA = −40 °C to +125 °C, the INA281A1IDBVT output swings to within 70 mV of VS (i.e., up to 4.93 V) and to within 5 mV of GND (i.e., down to 0.005 V) under 10-kΩ load. This rail-to-rail output capability ensures full utilization of ADC input ranges and reliable comparator triggering - a verified specification in Section 5.5 of the INA281A1IDBVT datasheet.
How does the gain error of the INA281A1IDBVT change with temperature?
The INA281A1IDBVT exhibits ±0.5% maximum gain error at room temperature, with gain drift limited to ±20 ppm/°C over −40 °C to +125 °C. This translates to ≤0.025% additional error across a 100°C span - significantly tighter than competing amplifiers like the MAX40056. This stability is achieved via laser-trimmed internal resistors and is explicitly characterized in Figure 5-4 of the INA281A1IDBVT datasheet.
Can the INA281A1IDBVT be used with a 2.7-V supply?
Yes, the INA281A1IDBVT is fully specified for operation from 2.7 V to 20 V supply, including all electrical characteristics across −40 °C to +125 °C. At 2.7 V, its output swing remains functional (VS − 0.15 V min, GND + 0.005 V min), and quiescent current drops to ~1.25 mA. This makes the INA281A1IDBVT suitable for low-power always-on monitoring in battery-backed telecom systems - a capability confirmed in Section 5.3 of its official datasheet.
INA281A1IDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 100 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
INA281A1IDBVT FAQ
1.How can I place an order for INA281A1IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA281A1IDBVT 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 INA281A1IDBVT reliable?
The price and inventory of INA281A1IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA281A1IDBVT is usually 5 days.
3.What payment methods are accepted for INA281A1IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA281A1IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA281A1IDBVT?
INA281A1IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA281A1IDBVT 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 INA281A1IDBVT?
For technical support, including INA281A1IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA281A1IDBVT requirements.
6.How does Aetrix verify that INA281A1IDBVT is sourced from the original manufacturer or authorized distributors?
All INA281A1IDBVT 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 INA281A1IDBVT meets industry standards.
7.What is the process for return or replacement of INA281A1IDBVT?
All INA281A1IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with INA281A1IDBVT, 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 INA281A1IDBVT part is unused and in its original packaging.
Return procedure for INA281A1IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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