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Texas Instruments INA271AIDG4
- Part No.:
- INA271AIDG4
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA271AIDG4.pdf
- Description:
- IC CURRENT MONITOR 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,369
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Product details
Overview
INA271AIDG4 from Texas Instruments is a voltage-output, unidirectional current-shunt monitor IC designed for high-accuracy sensing across shunt resistors at common-mode voltages from –16 V to +80 V. It features 20 V/V fixed gain, 130-kHz bandwidth, ±0.5-mV typical input offset, 120-dB CMRR, and operates from a single +2.7-V to +18-V supply - enabling precise current measurement in automotive battery monitoring and telecom power supplies.
For engineers reviewing the INA271AIDG4 datasheet, INA271AIDG4 pinout, INA271AIDG4 application, or INA271AIDG4 equivalent, this page delivers verified technical context, SOIC-8 package mapping, filtering-capable pin architecture, real-world accuracy behavior across VSENSE and VCM, and validated alternative options for current-sense amplifier selection.
Technical Context
The INA271AIDG4 integrates a precision current-sense amplifier with a dedicated preamp output (PRE OUT) and buffered output (OUT), enabling external RC filtering without degrading accuracy. Its dual-op-amp front-end architecture supports operation across –16 V to +80 V common-mode range independent of supply voltage, while maintaining 120-dB CMRR and 2.5 μV/°C offset drift.
It implements a two-stage signal path: first-stage amplification with 20 V/V total gain (including 2× buffer gain), followed by a high-impedance PRE OUT (96 kΩ) optimized for single-pole or Sallen-Key filter integration. The device draws only 700 μA typical quiescent current and is specified over –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V total gain - enables direct interface to 3.3-V ADCs with 100-mV shunt drop yielding 2-V output. |
| Common-Mode Range | –16 V to +80 V - supports battery reversal protection and load-dump transient immunity in 12-V/24-V automotive systems. |
| CMRR | 120 dB - rejects noise from high-side switching nodes in DC-DC converters and motor drives. |
| Offset Voltage | ±0.5 mV (typ) - contributes ≤0.5% error at 100-mV full-scale sense voltage, critical for low-current accuracy. |
| Bandwidth | 130 kHz - sufficient for closed-loop current control in PWM inverters and fast-charging battery management. |
| Supply Voltage | +2.7 V to +18 V - compatible with wide-input industrial power rails and single-supply microcontroller interfaces. |
| Quiescent Current | 700 μA (typ) - enables always-on current monitoring in energy-sensitive applications like portable medical devices. |
Pinout & Package
INA271AIDG4 is housed in an SOIC-8 (D) package measuring 4.90 mm × 3.91 mm, with standard JEDEC MS-012 footprint and gull-wing leads. Thermal resistance RθJA is 78.8°C/W, supporting operation up to +125°C ambient with minimal heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Analog input | Connects to supply side of shunt resistor; referenced to common-mode voltage up to +80 V. |
| IN– | Analog input | Connects to load side of shunt resistor; differential input defines VSENSE = VIN+ – VIN–. |
| PRE OUT | Analog output | High-impedance (96 kΩ) pre-buffer output for external RC filtering; enables configurable low-pass response. |
| BUF IN | Analog input | Accepts filtered signal from PRE OUT; internal 2× buffer gain applied before final OUT stage. |
| OUT | Analog output | Low-impedance (1.5 Ω) buffered output delivering final 20 V/V gain; drives 10-kΩ loads to within 50 mV of rails. |
| V+ | Power supply | Single positive supply input (+2.7 V to +18 V); powers both amplifier stages and buffer. |
| GND | Analog ground | Reference node for output swing and internal biasing; must be tied to system analog ground plane. |
| NC | No connection | Pin 7 has no internal connection; recommended to tie to GND for mechanical stability and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Wide common-mode input range | –16 V to +80 V enables direct high-side sensing in 48-V telecom rectifiers and 12-V automotive start-stop systems without level-shifting. |
| Integrated filtering architecture | Dedicated PRE OUT and BUF IN pins simplify addition of single-pole or second-order Sallen-Key filters to suppress PWM switching noise. |
| High CMRR (120 dB) | Maintains accuracy in noisy environments such as motor drive inverters where common-mode dv/dt exceeds 10 V/ns. |
| Low offset drift (2.5 μV/°C) | Ensures stable calibration over temperature in battery pack monitors operating from –40°C to +125°C. |
| 130-kHz bandwidth | Supports real-time current feedback in digital PFC controllers and Class-D amplifier current limiting loops. |
Applications
| Automotive Battery Monitoring | Telecom Rectifier Current Sensing |
|---|---|
Use Scenario: Real-time monitoring of starter battery charge/discharge current in 12-V vehicles with stop-start functionality. IC Role / Device Role / Timing Role: High-side current-shunt monitor interfacing to MCU ADC, rejecting alternator ripple and load-dump transients. Use Value: –16 V to +80 V common-mode range withstands reverse-battery connection and ISO 7637-2 pulse 5a without external protection. |
Use Scenario: Output current measurement in 48-V telecom rectifier modules supplying distributed base station power. IC Role / Device Role / Timing Role: Unidirectional current sensor placed on positive output rail, feeding isolated ADC via 20 V/V gain scaling. Use Value: 120-dB CMRR rejects common-mode noise from high-frequency LLC resonant converter switching. |
| Lithium-Ion Charger Safety Monitoring | Welding Equipment Current Feedback |
Use Scenario: Precision current sensing during CC/CV charging phases in multi-cell Li-ion battery chargers. IC Role / Device Role / Timing Role: Shunt-based current monitor providing feedback to charger controller for accurate termination and thermal derating. Use Value: ±0.5-mV offset ensures ≤0.5% full-scale error at 100-mV shunt drop, critical for compliance with IEC 62368-1 safety limits. |
Use Scenario: Closed-loop current regulation in industrial arc welding inverters requiring fast response to load changes. IC Role / Device Role / Timing Role: High-bandwidth (130 kHz) current sensor in inner current-control loop, driving gate driver with minimal phase lag. Use Value: 130-kHz bandwidth supports >10-kHz current loop update rates, improving arc stability and spatter reduction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1DR | 20 V/V gain, –4 V to +80 V common-mode, 350-kHz bandwidth, 50-μV offset (max), SOIC-8 | Better bandwidth and offset for high-speed motor control; lacks PRE OUT/BUF IN filtering architecture | Select when higher speed and lower offset outweigh need for integrated RC filtering capability. |
| MAX4080TASA+ | 20 V/V gain, –10 V to +76 V common-mode, 250-kHz bandwidth, 100-μV offset (max), SOIC-8 | Higher bandwidth and lower offset; requires external RC network for filtering, no dedicated filter pins | Prefer for space-constrained designs needing tighter offset spec but willing to add discrete filter components. |
Compared with INA271AIDG4, INA240A1DR offers 2.7× higher bandwidth and 5× lower max offset but omits the PRE OUT/BUF IN filtering interface; MAX4080TASA+ provides superior offset and bandwidth yet requires external passive filtering instead of the INA271AIDG4's built-in filter-ready architecture.
Availability
INA271AIDG4 is available at Aetrix Electronics and suitable for automotive battery management, telecom rectifier monitoring, lithium-ion charger safety circuits, and industrial welding equipment requiring stable component supply and long-term production continuity.
Supply support for INA271AIDG4 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 INA27x product line was designed specifically for high-voltage, high-accuracy current sensing in automotive, industrial, and telecom power systems - emphasizing robust common-mode rejection, integrated filtering flexibility, and extended temperature operation.
FAQ
What is the maximum common-mode voltage the INA271AIDG4 can handle?
The INA271AIDG4 supports a common-mode input voltage range of –16 V to +80 V, as specified in its absolute maximum ratings and recommended operating conditions. This allows direct high-side sensing in 48-V telecom systems and tolerance of automotive load-dump transients up to +80 V without external protection circuitry. Operation beyond these limits risks permanent damage.
Does the INA271AIDG4 require external filtering components?
The INA271AIDG4 does not require external filtering but is explicitly architected to support it via dedicated PRE OUT and BUF IN pins. A single capacitor from PRE OUT to GND forms a first-order low-pass filter using the 96-kΩ output impedance; for steeper roll-off, a Sallen-Key configuration is enabled. No filtering is needed for basic DC or low-frequency current measurement.
What is the gain accuracy of the INA271AIDG4 over temperature?
The INA271AIDG4 exhibits ±2% total gain error over the full –40°C to +125°C operating temperature range, with a maximum gain drift of 50 ppm/°C. At room temperature, typical gain error is ±0.2%, making it suitable for applications where calibrated gain stability is required across automotive and industrial thermal profiles.
Can the INA271AIDG4 be used for bidirectional current sensing?
No, the INA271AIDG4 is a unidirectional current-shunt monitor optimized for sensing current flow in one direction only - from IN+ to IN–. Its architecture and specifications (e.g., output swing referenced to GND, lack of bipolar output capability) do not support accurate bidirectional measurement. For bidirectional applications, TI's INA226 or INA240 series are appropriate alternatives.
What package type is used for the INA271AIDG4?
The INA271AIDG4 is packaged in an SOIC-8 (D) body with nominal dimensions of 4.90 mm × 3.91 mm. This surface-mount package features gull-wing leads, JEDEC MS-012 compliance, and a junction-to-ambient thermal resistance (RθJA) of 78.8°C/W, enabling reliable operation in compact, thermally constrained PCB layouts.
INA271AIDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Current Monitor
- Sensing Method:
- High-Side
- Accuracy:
- ±1%
- Voltage - Input:
- -16V ~ 80V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA271AIDG4 FAQ
1.How can I place an order for INA271AIDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA271AIDG4 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 INA271AIDG4 reliable?
The price and inventory of INA271AIDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA271AIDG4 is usually 5 days.
3.What payment methods are accepted for INA271AIDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA271AIDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA271AIDG4?
INA271AIDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA271AIDG4 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 INA271AIDG4?
For technical support, including INA271AIDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA271AIDG4 requirements.
6.How does Aetrix verify that INA271AIDG4 is sourced from the original manufacturer or authorized distributors?
All INA271AIDG4 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 INA271AIDG4 meets industry standards.
7.What is the process for return or replacement of INA271AIDG4?
All INA271AIDG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA271AIDG4, 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 INA271AIDG4 part is unused and in its original packaging.
Return procedure for INA271AIDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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