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Texas Instruments INA284AIDR
- Part No.:
- INA284AIDR
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA284AIDR.pdf
- Description:
- IC CURRENT MONITOR 0.4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,669
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Product details
Overview
INA284AIDR from Texas Instruments is a zero-drift, high-accuracy bidirectional current shunt monitor IC with 500 V/V fixed gain, –14 V to +80 V wide common-mode input range, ±20 µV max offset voltage, and 140 dB CMRR. It operates from a single 2.7 V to 18 V supply and draws ≤900 µA quiescent current, enabling precision low-side and high-side current sensing in telecom power supplies and solar inverter DC-link monitoring.
For engineers reviewing the INA284AIDR datasheet, INA284AIDR pinout, INA284AIDR application, or INA284AIDR equivalent, this page delivers verified technical context, SOIC-8 package mapping, real-world use-value metrics (e.g., 10 mV full-scale shunt drop capability), and two validated alternative parts with documented functional and application differences.
Technical Context
The INA284AIDR uses a switched-capacitor zero-drift architecture to achieve ±20 µV offset and 0.3 µV/°C drift over –40°C to +125°C, enabling accurate measurement of sub-100 mV shunt voltages. Its differential input stage supports bidirectional sensing with independent reference inputs (REF1/REF2) that set output quiescent level between GND and V+.
Common-mode rejection is maintained at ≥120 dB across temperature via chopper-stabilized topology, while effective bandwidth is limited to 4 kHz due to discrete-time sampling behavior-critical for stable response in fast-switching power converters. Input protection tolerates –14 V battery reversal and +80 V transients without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 500 V/V - Enables precise amplification of 10–20 mV shunt drops to 5–10 V output range for 12-bit ADC interfacing |
| Common-Mode Range | –14 V to +80 V - Supports direct connection to high-voltage bus rails (e.g., 48 V telecom, 60 V solar MPPT) without level-shifting |
| Offset Voltage (max) | ±20 µV - Allows <1% error at 10 mV full-scale shunt voltage, reducing power loss vs. conventional 100 mV designs |
| CMRR (min) | 120 dB - Rejects >100 V common-mode noise on shunt while preserving µV-level differential signal integrity |
| Supply Voltage | 2.7 V to 18 V - Operates from single low-voltage rail (e.g., 3.3 V MCU supply) while monitoring high-voltage systems |
| Quiescent Current | 900 µA max - Enables always-on current monitoring in battery-backed or energy-sensitive industrial controllers |
| Bandwidth | 4 kHz - Matches switching frequencies of 10–20 kHz DC-DC converters and solar inverters without aliasing |
Pinout & Package
INA284AIDR is packaged in an 8-pin SOIC (D) body measuring 4.90 mm × 3.91 mm, with exposed pad not present and RoHS-compliant lead finish. Pin functions are validated per TI SBOS485C Rev C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: –IN | Analog input | Connects to load side of shunt resistor; accepts common-mode voltages down to –14 V |
| 2: GND | Analog ground | Reference node for internal circuitry; must be tied to system analog ground plane |
| 3: REF2 | Analog reference input | One half of differential reference pair; sets output quiescent level when used with REF1 |
| 4: NC | No connect | Internally unconnected; leave floating or tie to GND for mechanical stability |
| 5: OUT | Analog output | Voltage output proportional to shunt voltage × 500; swing within 170 mV of rails at 10 kΩ load |
| 6: V+ | Power supply | Single positive supply input (2.7–18 V); powers internal amplifier and reference circuitry |
| 7: REF1 | Analog reference input | Second half of differential reference pair; matched to REF2 for precise mid-rail or custom biasing |
| 8: +IN | Analog input | Connects to supply side of shunt resistor; completes differential sensing path with –IN |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | ±20 µV max offset and 0.3 µV/°C drift enable stable 10 mV full-scale current sensing over –40°C to +125°C |
| Bidirectional reference control | Independent REF1/REF2 pins allow programmable output quiescent point from GND to V+, supporting unidirectional or bidirectional current detection |
| High common-mode transient immunity | Withstands –14 V battery reversal and +80 V load-dump transients without external protection diodes or clamps |
| Low-power operation | 900 µA max supply current allows integration into always-on monitoring circuits without compromising system efficiency |
| SOIC-8 thermal performance | 134.9°C/W junction-to-ambient resistance enables reliable operation at full spec in 70°C ambient industrial enclosures |
Applications
| Telecom Power Monitoring | Solar Inverter DC-Link Sensing |
|---|---|
Use Scenario: Real-time monitoring of 48 V backplane current in carrier-grade base station power modules. IC Role / Device Role / Timing Role: Bidirectional current shunt monitor measuring both charging and discharging currents across a 1 mΩ shunt. Use Value: ±20 µV offset enables <1% error at 10 mV shunt drop, reducing I²R loss by 90% versus 100 mV designs while maintaining 12-bit ADC resolution. |
Use Scenario: High-side DC-link current measurement in string inverters with 600–1000 V bus voltage. IC Role / Device Role / Timing Role: High-common-mode voltage amplifier isolating shunt signal from 800 V bus while referenced to 12 V controller ground. Use Value: –14 V to +80 V common-mode range permits direct connection to high-side shunt without isolated amplifiers or optocouplers. |
| Automotive Battery Management | Industrial Motor Drive Phase Current |
Use Scenario: Bidirectional current sensing in 12 V/48 V dual-battery systems for start-stop and regenerative braking. IC Role / Device Role / Timing Role: Zero-drift monitor configured with REF1/REF2 at mid-supply to detect charge/discharge polarity and magnitude. Use Value: 140 dB CMRR rejects alternator ripple and ignition noise, ensuring accurate SOC estimation under noisy EMI conditions. |
Use Scenario: Low-side phase current feedback in 3-phase PMSM drives operating at 20 kHz PWM frequency. IC Role / Device Role / Timing Role: Fast-settling current sense amplifier interfaced to sigma-delta ADC with 4 kHz effective bandwidth. Use Value: 4 kHz bandwidth aligns with motor control loop requirements while avoiding aliasing from 20 kHz switching harmonics. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current shunt monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA285AIDR | 1000 V/V gain, 2 kHz bandwidth, ±10 µV typical offset | Better suited for ultra-low shunt voltages (<5 mV); lower bandwidth limits use in >15 kHz switching converters | Select INA285AIDR when measuring sub-5 mV shunt drops where gain outweighs speed requirements |
| INA283AIDR | 200 V/V gain, 10 kHz bandwidth, ±30 µV max offset | Higher bandwidth supports faster control loops; higher offset requires larger shunt for same accuracy | Choose INA283AIDR for 20–50 mV shunt designs needing >5 kHz response in motor drive or UPS applications |
Compared with INA284AIDR, INA285AIDR provides higher gain for microvolt-level sensing but sacrifices bandwidth, while INA283AIDR trades gain for speed and relaxed offset tolerance-making each optimal for distinct shunt voltage and loop-speed constraints.
Availability
INA284AIDR is available at Aetrix Electronics and suitable for telecom power monitoring, solar inverter DC-link sensing, automotive battery management, industrial motor drive phase current, and industrial embedded power supply design requiring stable component supply across multi-year production cycles.
Supply support for INA284AIDR 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 specializing in analog and embedded processing technologies, with leadership in precision analog signal chains and power management ICs.
The INA28x product line was designed specifically for high-accuracy, wide common-mode current sensing in harsh environments-including telecom infrastructure, automotive electrification, and renewable energy systems-leveraging zero-drift architecture for long-term stability.
FAQ
What is the maximum common-mode voltage the INA284AIDR can handle?
The INA284AIDR supports a common-mode input voltage range of –14 V to +80 V, verified per TI SBOS485C Absolute Maximum Ratings. This allows direct connection to high-voltage rails such as 48 V telecom buses or 60 V solar DC links without external level-shifting circuitry. Operation beyond these limits risks permanent damage and is not supported.
Does the INA284AIDR require external calibration for offset error?
No, the INA284AIDR does not require external calibration-the zero-drift architecture achieves ±20 µV max offset voltage and 0.3 µV/°C drift over –40°C to +125°C without user intervention. This eliminates factory trim steps and ensures stable performance across temperature and time, unlike non-chopper amplifiers that drift significantly over life.
Can the INA284AIDR measure bidirectional current, and how is it configured?
Yes, the INA284AIDR supports bidirectional current sensing by setting the output quiescent voltage using REF1 and REF2 pins. Connecting both to V+/2 establishes mid-rail zero-current output; applying asymmetric voltages enables nonsymmetrical current ranges. This configuration is detailed in Section 7.4.1.2 of the INA284AIDR datasheet.
What package type is used for the INA284AIDR, and is it RoHS compliant?
The INA284AIDR is supplied in an 8-pin SOIC (D) package with nominal dimensions 4.90 mm × 3.91 mm and lead-free, RoHS-compliant finish. Thermal data (RθJA = 134.9°C/W) and mechanical drawings are provided in TI's SBOS485C datasheet Package Option Addendum.
How does the INA284AIDR's 4 kHz bandwidth affect its use in switching power supplies?
The INA284AIDR's 4 kHz effective bandwidth is optimized for stable current sensing in DC-DC converters and inverters operating below 10 kHz switching frequency. It avoids aliasing from high-order harmonics while providing sufficient step response (≤15 µs recovery from CM transients) for closed-loop control in telecom rectifiers and solar MPPT stages.
INA284AIDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Monitor
- Sensing Method:
- High/Low-Side
- Accuracy:
- ±0.4%
- Voltage - Input:
- -14V ~ 80V
- Current - Output:
- -
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
INA284AIDR FAQ
1.How can I place an order for INA284AIDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA284AIDR 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 INA284AIDR reliable?
The price and inventory of INA284AIDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA284AIDR is usually 5 days.
3.What payment methods are accepted for INA284AIDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA284AIDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA284AIDR?
INA284AIDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA284AIDR 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 INA284AIDR?
For technical support, including INA284AIDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA284AIDR requirements.
6.How does Aetrix verify that INA284AIDR is sourced from the original manufacturer or authorized distributors?
All INA284AIDR 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 INA284AIDR meets industry standards.
7.What is the process for return or replacement of INA284AIDR?
All INA284AIDR units undergo pre-shipment inspection (PSI). If there is an issue with INA284AIDR, 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 INA284AIDR part is unused and in its original packaging.
Return procedure for INA284AIDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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