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Texas Instruments INA181A2IDBVT
- Part No.:
- INA181A2IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
INA181A2IDBVT.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,581
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Product details
Overview
INA181A2IDBVT from Texas Instruments is a single-channel, bidirectional current-sense amplifier optimized for high-accuracy, low-power current monitoring in both high-side and low-side configurations. It features 50 V/V fixed gain, –0.2 V to +26 V input common-mode range, ±500 µV max offset at 12 V VCM, 210 kHz bandwidth, and 2 V/µs slew rate - enabling precise motor control and battery monitoring in 2.7–5.5 V systems.
For engineers reviewing the INA181A2IDBVT datasheet, INA181A2IDBVT pinout, INA181A2IDBVT application, or INA181A2IDBVT equivalent, this page delivers verified specifications, validated SOT-23-6 pin functions, real-world use cases in power management and solar inverters, and two confirmed alternative parts with documented technical and application differences.
Technical Context
The INA181A2IDBVT implements a precision current-shunt monitor architecture with integrated matched resistor gain network (50 V/V), enabling accurate RTI voltage measurement across sense resistors independent of supply voltage. Its proprietary topology supports operation with common-mode voltages up to 26 V - exceeding its 2.7–5.5 V supply rail - making it suitable for direct connection to high-voltage bus lines without level-shifting.
It delivers bidirectional sensing via REF pin biasing, where output voltage = GAIN × (IN+ − IN−) + VREF, supporting zero-current centered outputs. The device achieves ±1% max gain error and 1 µV/°C max offset drift over –40°C to +125°C, with rail-to-rail output swing (within 30 mV of VS and 5 mV of GND) for maximum dynamic range utilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50 V/V fixed - eliminates external gain-setting components and reduces temperature-induced gain error. |
| Common-mode range | –0.2 V to +26 V - enables direct high-side sensing on 24-V industrial buses without attenuation or isolation. |
| Offset voltage | ±500 µV max at VCM = 12 V - ensures ≤10 mA error when measuring 100 mΩ shunt at 1 A, critical for battery SOC accuracy. |
| Bandwidth | 210 kHz - supports fast transient detection in motor phase current monitoring and overcurrent protection. |
| Supply voltage | 2.7 V to 5.5 V - compatible with single Li-ion, USB, or 3.3-V/5-V system rails without LDO overhead. |
| Quiescent current | 260 µA max - enables always-on current monitoring in energy-sensitive applications like portable medical devices. |
| Output swing | Within 30 mV of VS and 5 mV of GND - maximizes usable ADC input range in 12-bit systems with 3.3-V reference. |
Pinout & Package
INA181A2IDBVT is packaged in a 6-pin SOT-23 (DBV) with 2.90 mm × 2.80 mm footprint, optimized for space-constrained PCB layouts and thermal performance (RθJA = 198.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT | Analog output | Current-sense amplifier output voltage referenced to GND; drives ADC or comparator directly. |
| 2: GND | Analog ground | Reference node for all analog signals; must be connected to low-impedance system ground plane. |
| 3: IN+ | Analog input (+) | Positive input of differential pair; connects to bus side of shunt in high-side, load side in low-side sensing. |
| 4: IN− | Analog input (−) | Negative input of differential pair; connects to load side of shunt in high-side, ground side in low-side sensing. |
| 5: REF | Analog reference input | Bias point for bidirectional output; sets zero-current output level (e.g., 1.65 V for 3.3-V ADC mid-scale). |
| 6: VS | Power supply | 2.7–5.5 V analog supply; bypass with 0.1 µF ceramic capacitor close to pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing | Enables true zero-centered current measurement using REF pin bias - essential for regenerative braking and charge/discharge monitoring. |
| Wide VCM range | Operates with inputs up to 26 V while powered from 3.3 V - eliminates need for isolated amplifiers or resistive dividers in 24-V systems. |
| Matched internal gain resistors | Reduces gain error to ±1% max and minimizes temperature drift (1.5 ppm/°C) - improves long-term calibration stability. |
| Rail-to-rail output | Delivers full-scale output within 30 mV of VS and 5 mV of GND - preserves >98% of 3.3-V ADC range without external level-shifting. |
| Low quiescent current | 260 µA max enables continuous current monitoring in battery-powered devices with multi-year runtime. |
Applications
| Motor Control | Battery Monitoring |
|---|---|
|
Use Scenario: Real-time phase current sensing in BLDC motor drivers for field-oriented control (FOC). IC Role / Device Role / Timing Role: Current-shunt monitor converting mV-level shunt voltage to amplified analog signal for MCU ADC sampling at ≥20 kHz. Use Value: 210 kHz bandwidth and 2 V/µs slew rate enable accurate capture of PWM ripple and fault transients, improving torque regulation and stall detection. |
Use Scenario: Bidirectional current measurement in lithium-ion battery packs for state-of-charge (SOC) and health (SOH) estimation. IC Role / Device Role / Timing Role: High-precision current sensor interfacing to fuel-gauge IC or microcontroller ADC with REF-biased output for charge/discharge polarity indication. Use Value: ±500 µV max offset at 12 V VCM ensures <±10 mA error on 100 mΩ shunt, directly improving SOC accuracy by up to 2% over full cycle. |
| Power Management | Solar Inverters |
|
Use Scenario: Input/output current monitoring in DC-DC converters and PMICs for overcurrent protection and efficiency optimization. IC Role / Device Role / Timing Role: Low-side current sense amplifier feeding protection logic or digital controller with fast response to load-step events. Use Value: –0.2 V to +26 V common-mode range allows direct placement on high-side or low-side of buck/boost stages without voltage translation. |
Use Scenario: String current monitoring in photovoltaic combiner boxes for fault detection and MPPT optimization. IC Role / Device Role / Timing Role: High-voltage common-mode current sensor placed between PV string and inverter input, operating at up to 26 V common-mode. Use Value: Ability to withstand –0.2 V to +26 V VCM enables direct connection to PV strings without external attenuators, reducing BOM cost and measurement error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2IDR | Higher bandwidth (400 kHz), wider VCM (–4 V to 80 V), higher quiescent current (1.1 mA), SOIC-8 package. | Required for 48-V industrial systems or faster transient response; not drop-in due to different pinout and supply requirements. | Select when VCM exceeds 26 V or bandwidth >210 kHz is needed; verify layout changes for SOIC-8 and thermal design. |
| MAX40056ATA+T | 50 V/V gain, 270 kHz bandwidth, ±150 µV max offset at VCM = 0 V, 2.7–5.5 V supply, 6-pin WLP package. | Superior offset performance at low VCM but untested above 12 V VCM; smaller WLP footprint limits thermal dissipation. | Prefer for ultra-low-offset, space-constrained designs below 12 V VCM; avoid for 24-V bus monitoring where INA181A2IDBVT's 26 V rating is validated. |
Compared with INA240A2IDR and MAX40056ATA+T, the INA181A2IDBVT offers the optimal balance of 26-V VCM compliance, 210-kHz bandwidth, and 260-µA quiescent current in a standard SOT-23 package - making it the most cost-effective and layout-compatible choice for 24-V industrial and battery-powered applications requiring bidirectional sensing.
Availability
INA181A2IDBVT is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter applications requiring stable component supply, extended temperature support (–40°C to +125°C), and long-term production continuity.
Supply support for INA181A2IDBVT 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 signal conditioning and power management ICs.
The INA181 family was designed specifically for cost-optimized, high-accuracy bidirectional current sensing in industrial, automotive, and energy systems - emphasizing wide common-mode range, low offset, and minimal external component count.
FAQ
What is the maximum common-mode voltage supported by the INA181A2IDBVT?
The INA181A2IDBVT supports a common-mode input voltage range of –0.2 V to +26 V, independent of its 2.7–5.5 V supply voltage. This allows direct high-side sensing on 24-V industrial buses without external level-shifting circuitry. The specification is validated per TI SBOS793H datasheet Section 6.3, with absolute maximum rating of 26 V under recommended operating conditions.
Does the INA181A2IDBVT support bidirectional current sensing, and how is it implemented?
Yes, the INA181A2IDBVT supports true bidirectional current sensing via its REF pin. Applying a reference voltage (e.g., VS/2 = 1.65 V for 3.3-V supply) centers the output: positive current yields VOUT > VREF, negative current yields VOUT < VREF. This is explicitly defined in Equation 1 of the SBOS793H datasheet and enables charge/discharge monitoring in battery systems without polarity-switching circuitry.
What is the gain accuracy and temperature drift of the INA181A2IDBVT?
The INA181A2IDBVT has a guaranteed gain error of ±1% maximum over –40°C to +125°C, with gain error drift of 1.5–20 ppm/°C. These values are specified in Section 6.5 of the SBOS793H datasheet under "Gain error vs temperature" and reflect the stability provided by its integrated matched resistor network - eliminating external resistor tolerances and thermal tracking errors.
Can the INA181A2IDBVT operate with a 3.3-V supply and still measure currents on a 24-V bus?
Yes - the INA181A2IDBVT operates from 2.7 V to 5.5 V while accepting input common-mode voltages up to +26 V. This decoupling allows it to be powered from a 3.3-V rail while directly monitoring current on a 24-V bus in high-side configuration. This capability is core to its architecture and confirmed in Sections 3 and 7.3.3 of the SBOS793H datasheet.
What package type and pinout does the INA181A2IDBVT use?
The INA181A2IDBVT uses the 6-pin SOT-23 (DBV) package with standardized pinout: Pin 1 = OUT, Pin 2 = GND, Pin 3 = IN+, Pin 4 = IN−, Pin 5 = REF, Pin 6 = VS. This is documented in Figure 5-1 and Table 5-1 of the SBOS793H datasheet, and matches industry-standard SOT-23 footprints for easy layout integration.
INA181A2IDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 350 kHz
- Current - Input Bias:
- -
- Voltage - Input Offset:
- -
- Current - Supply:
- 260µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
INA181A2IDBVT FAQ
1.How can I place an order for INA181A2IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for INA181A2IDBVT 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 INA181A2IDBVT reliable?
The price and inventory of INA181A2IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA181A2IDBVT is usually 5 days.
3.What payment methods are accepted for INA181A2IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA181A2IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA181A2IDBVT?
INA181A2IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA181A2IDBVT 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 INA181A2IDBVT?
For technical support, including INA181A2IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA181A2IDBVT requirements.
6.How does Aetrix verify that INA181A2IDBVT is sourced from the original manufacturer or authorized distributors?
All INA181A2IDBVT 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 INA181A2IDBVT meets industry standards.
7.What is the process for return or replacement of INA181A2IDBVT?
All INA181A2IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with INA181A2IDBVT, 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 INA181A2IDBVT part is unused and in its original packaging.
Return procedure for INA181A2IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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