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Texas Instruments INA281A5IDBVT
- Part No.:
- INA281A5IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
INA281A5IDBVT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:347
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Product details
Overview
INA281A5IDBVT from Texas Instruments is a high-precision, unidirectional current-sense amplifier optimized for high-side or low-side shunt monitoring in 48-V and 110-V systems. It delivers 500 V/V fixed gain, ±0.5% max gain error, ±15 µV max input offset voltage (−40°C to +125°C), and operates across −4 V to +110 V common-mode range with 1.3 MHz bandwidth - enabling fast overcurrent detection in telecom power supplies and solenoid control.
For engineers reviewing the INA281A5IDBVT datasheet, INA281A5IDBVT pinout, INA281A5IDBVT application, or INA281A5IDBVT equivalent, this page provides verified specifications, SOT-23-5 pin mapping, real-world use cases in 48-V rack servers and macro RRUs, and validated alternative parts with documented functional trade-offs.
Technical Context
The INA281A5IDBVT uses a transconductance architecture with current-feedback amplifier topology, enabling 20 µA typical input bias current at 110 V common-mode and supporting operation below ground (−4 V) for recirculating current measurement in half-bridge configurations. Its zero-drift input stage ensures ±0.1 µV/°C offset drift and maintains <0.25% gain error over temperature.
This variant implements a precision internal resistor network (2 kΩ/1000 kΩ) to fix gain at 500 V/V - not user-adjustable - and achieves 900 kHz −3 dB bandwidth at 8 mV differential input, with 2.5 V/µs slew rate and 10 µs settling time to 0.5% for 4 V output steps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 500 V/V - sets output = 500 × shunt voltage; enables 10 mV sense signal to produce 5 V full-scale output |
| Common-mode range | −4 V to +110 V - supports high-side sensing on 48-V/60-V rails and operation below ground for bidirectional current analysis |
| Bandwidth | 900 kHz - sufficient for sub-µs overcurrent response in telecom PSUs and RRU protection circuits |
| Input offset voltage | ±15 µV max (−40°C to +125°C) - limits current measurement error to ≤3 µA on 5 mΩ shunt at 125°C |
| Gain error | ±0.5% max at 25°C - contributes ≤2.5 mV error at 500 mV output, critical for accurate 48-V PSU current reporting |
| Supply voltage | 2.7 V to 20 V - compatible with 3.3-V control logic and 12-V/15-V auxiliary rails without level-shifting |
| Quiescent current | 1.5 mA - enables always-on monitoring in energy-sensitive 48-V server management units |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm height, surface-mount, lead-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Amplified output | Delivers 500×(IN+ − IN−); swings to within 70 mV of VS and 5 mV above GND under 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 typical input bias current |
| 4: IN− | Negative shunt sense input | Connects to low-side of shunt; matched bias current minimizes common-mode induced error |
| 5: Vs | Power supply | Accepts 2.7–20 V; powers internal amplifier and output buffer; decoupling capacitor required at pin |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 500 V/V gain | Eliminates external gain-setting resistors; avoids tolerance-induced errors and layout sensitivity in high-accuracy 48-V PSU feedback loops |
| −4 V to +110 V common-mode range | Enables direct high-side sensing on 48-V bus without level-shifting; supports negative rail operation for half-bridge recirculation current capture |
| 120 dB DC CMRR | Rejects >99.9999% of common-mode noise from switching regulators, ensuring stable current readout in noisy macro RRU environments |
| 900 kHz bandwidth at 500 V/V | Supports <2 µs overcurrent response on 2 mΩ shunts - meets fast-trip requirements for telecom equipment protection |
| ±15 µV max offset (−40°C to +125°C) | Reduces zero-current output error to <7.5 mV, enabling precise low-current detection in solenoid hold-state monitoring |
Applications
| 48-V Rack Server Power Monitoring | Macro Remote Radio Unit (RRU) |
|---|---|
Use Scenario: Real-time current monitoring of 48-V backplane distribution in hyperscale data center servers. IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring voltage drop across 1 mΩ shunt; outputs scaled analog signal to ADC for PMBus telemetry. Use Value: Enables ±0.5% full-scale current accuracy across −40°C to +125°C, supporting dynamic power capping and fault logging without calibration drift. |
Use Scenario: Overcurrent protection and load current reporting in outdoor macro-cell base station power stages. IC Role / Device Role / Timing Role: Low-latency current monitor on PA DC feed line; triggers shutdown within 2 µs when >75 A threshold exceeded on 2 mΩ shunt. Use Value: 900 kHz bandwidth and 2.5 V/µs slew rate ensure compliance with 3GPP TR 38.901 fast-fault response requirements for 5G infrastructure. |
| Solenoid Control Feedback | Telecom Equipment Power Supply |
Use Scenario: Closed-loop current regulation for industrial pneumatic solenoid valves operating from 24-V/48-V supplies. IC Role / Device Role / Timing Role: Unidirectional shunt amplifier feeding PWM controller; senses hold current during steady-state actuation. Use Value: ±15 µV max offset ensures <3 µA measurement uncertainty on 5 mΩ shunt - critical for distinguishing between hold and pull-in current thresholds. |
Use Scenario: Input/output current supervision in modular telecom PSUs compliant with NEBS Level 3 and ETSI EN 300 132-2. IC Role / Device Role / Timing Role: Dual-channel monitoring (input AC-DC and output DC-DC) using separate INA281A5IDBVT devices per rail. Use Value: 120 dB DC CMRR rejects switching noise from adjacent 500 kHz converters, maintaining <0.1% current reading stability during burst-mode operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A5DR | 500 V/V gain, but wider −5 V to +80 V common-mode range; 10 µV max offset; 4 V/V to 500 V/V selectable via pins | Requires external configuration pins; better offset spec but lower max common-mode than INA281A5IDBVT | Select for tighter offset-critical designs where 80 V CM limit suffices and pin-strapping flexibility is needed |
| MAX40056AUBB+T | 500 V/V gain, −5 V to +65 V common-mode, 1.5 MHz bandwidth, ±10 µV offset; requires external gain resistors | Needs external 0.1% resistors for gain setting; higher bandwidth but narrower voltage range than INA281A5IDBVT | Select when board space allows discrete resistor placement and 65 V CM limit aligns with system rail |
Compared with INA281A5IDBVT, INA240A5DR offers superior offset performance but sacrifices 30 V of common-mode headroom, while MAX40056AUBB+T delivers higher bandwidth at the cost of external component dependency and reduced voltage range - making INA281A5IDBVT optimal for 48-V/60-V high-side sensing where integrated gain and wide CM range are primary constraints.
Availability
INA281A5IDBVT is available at Aetrix Electronics and suitable for 48-V rack servers, macro remote radio units, and telecom power supplies requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA281A5IDBVT 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The INA281 product line targets high-accuracy, high-bandwidth current sensing in next-generation power infrastructure - specifically designed for 48-V server racks, 5G RRU power stages, and safety-critical solenoid control where wide common-mode range and low drift are mandatory.
FAQ
What is the maximum common-mode voltage supported by the INA281A5IDBVT?
The INA281A5IDBVT supports a continuous operational common-mode voltage range of −4 V to +110 V, with survival capability up to −20 V and +120 V. This allows direct high-side sensing on 48-V and 60-V rails without level-shifting circuitry, and enables operation below ground for half-bridge recirculation current measurement in motor drives and power converters.
Does the INA281A5IDBVT support bidirectional current sensing?
No, the INA281A5IDBVT operates in unidirectional mode only - it measures current flowing from power supply to load. Its architecture does not support reverse current detection or true bidirectional operation. For bidirectional applications, TI recommends the INA229 or INA240 families, which include dedicated bidirectional variants.
What is the bandwidth of the INA281A5IDBVT at its 500 V/V gain setting?
The INA281A5IDBVT has a −3 dB bandwidth of 900 kHz when configured for 500 V/V gain with an 8 mV differential input signal and 5 pF load capacitance. Bandwidth decreases slightly with lower VSENSE; this value is specified per TI SBOSA29A datasheet Section 5.5 and confirmed in Figure 6-1.
Can the gain of the INA281A5IDBVT be modified externally?
No - the INA281A5IDBVT uses a precision internal resistor network (2 kΩ/1000 kΩ) to fix gain at 500 V/V. TI explicitly advises against adding external resistors to modify gain, as absolute resistor values vary significantly across units and would degrade accuracy, CMRR, and stability. Gain selection must be made at order time via part number suffix.
What package type and pin count does the INA281A5IDBVT use?
The INA281A5IDBVT is housed in a 5-pin SOT-23 (DBV) package with nominal dimensions of 2.90 mm × 1.60 mm. Pinout follows the INA281A variant: Pin 1 = OUT, Pin 2 = GND, Pin 3 = IN+, Pin 4 = IN−, Pin 5 = Vs - as confirmed in Figure 4-1 and Table 4-1 of the official datasheet.
INA281A5IDBVT 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:
- 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
INA281A5IDBVT FAQ
1.How can I place an order for INA281A5IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA281A5IDBVT 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 INA281A5IDBVT reliable?
The price and inventory of INA281A5IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA281A5IDBVT is usually 5 days.
3.What payment methods are accepted for INA281A5IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA281A5IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA281A5IDBVT?
INA281A5IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA281A5IDBVT 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 INA281A5IDBVT?
For technical support, including INA281A5IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA281A5IDBVT requirements.
6.How does Aetrix verify that INA281A5IDBVT is sourced from the original manufacturer or authorized distributors?
All INA281A5IDBVT 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 INA281A5IDBVT meets industry standards.
7.What is the process for return or replacement of INA281A5IDBVT?
All INA281A5IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with INA281A5IDBVT, 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 INA281A5IDBVT part is unused and in its original packaging.
Return procedure for INA281A5IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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