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Texas Instruments INA285AIDGKR
- Part No.:
- INA285AIDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA285AIDGKR.pdf
- Description:
- IC CURRENT MONITOR 0.4% 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,253
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Product details
Overview
INA285AIDGKR from Texas Instruments is a voltage-output, high-side current shunt monitor with fixed 1000 V/V gain, –14 V to +80 V common-mode input range, 70 µV max offset voltage, 1.4% max gain error, and >130 dB DC–10 Hz CMRR. It enables precision bidirectional current sensing in industrial PLCs, motor control, and aerospace auxiliary power monitoring.
For engineers reviewing the INA285AIDGKR datasheet, INA285AIDGKR pinout, INA285AIDGKR application, or INA285AIDGKR equivalent, this page delivers verified specifications, package mapping, real-world EFT immunity data (1 kV per IEC61000-4-4), functional role in high-side sensing topologies, and validated alternative options for 24-V/28-V/80-V rail current measurement.
Technical Context
The INA285AIDGKR implements a zero-drift, precision instrumentation amplifier architecture optimized for differential voltage amplification across a shunt resistor under extreme common-mode transients. Its input stage operates independently of supply voltage (2.7 V to 18 V), enabling accurate sensing at VCM = +80 V while powered from 5 V.
It features integrated overvoltage protection up to ±45 V on input pins, supports bi-directional operation via dual reference inputs (REF1/REF2), and maintains stable output during 1-kV EFT bursts due to internal robustness and compatibility with external TVS-filter networks as validated in TIDU227.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 1000 V/V - scales 1-mV shunt drop to 1-V output, enabling high-resolution ADC interfacing with minimal signal conditioning |
| Common-Mode Input Range | –14 V to +80 V - supports sensing on negative-rail systems (e.g., automotive battery reverse polarity) and high-voltage industrial buses without level-shifting |
| Offset Voltage (max) | 70 µV - ensures ≤70-µA error at 100-mΩ shunt, critical for low-current detection in smart battery chargers |
| Gain Error (max) | 1.4% - guarantees full-scale accuracy within ±14 mV at 1-V output, meeting <2% total system error requirement per TIDU227 |
| CMRR (DC–10 Hz) | >130 dB - rejects >106:1 common-mode noise from 24-V bus switching, preserving microvolt-level sense signal integrity |
| Supply Voltage Range | 2.7 V to 18 V - allows direct interface with 3.3-V or 5-V microcontrollers and compatibility with wide-input industrial supplies |
| EFT Immunity | 1 kV per IEC61000-4-4 - validated in TI reference design TIDU227 with external TVS/clamp network for factory automation EMC compliance |
Pinout & Package
INA285AIDGKR is housed in an 8-pin VSSOP (DGK) package with 0.65-mm pitch, 3.0-mm × 3.0-mm body, and exposed thermal pad for enhanced power dissipation in continuous 900-µA operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply input | Accepts 2.7–18 V; powers internal amplifier and reference; decoupling capacitor required near pin |
| GND | Ground reference | Return path for supply and output; must be connected to low-impedance system ground plane |
| VIN– | Inverting input | Connects to low-side of shunt; withstands –14 V to +80 V common mode; requires Kelvin trace routing |
| VIN+ | Non-inverting input | Connects to high-side of shunt; same common-mode rating as VIN–; matched trace length critical for CMRR |
| REF1 | Reference input 1 | Bi-directional mode: sets output midpoint; unidirectional mode: connect to GND |
| REF2 | Reference input 2 | Paired with REF1 to define VREF; average determines zero-current output level |
| VOUT | Analog output | Voltage output = 1000 × VSH + VREF; swing limited to (GND + 0.4 V) to (V+ – 0.4 V) at 5 V supply |
| NC | No connect | Pin 8 is internally unused; must remain floating or grounded per layout guidelines to avoid parasitic coupling |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Eliminates offset drift over temperature and time-ensures stable 70-µV baseline across –40°C to +125°C industrial range |
| Fixed 1000× gain | Removes external gain-setting resistors-reduces BOM count, layout sensitivity, and mismatch-induced errors in high-accuracy systems |
| Overvoltage protected inputs | Withstands ±45 V transient excursions-enables direct connection to 24-V/28-V rails without external clamping diodes in non-IEC-critical designs |
| Bi-directional sensing support | Dual REF pins allow configurable output centering-supports motor regenerative braking and battery charge/discharge monitoring with single device |
| High CMRR at low frequency | >130 dB from DC to 10 Hz-rejects ripple and slow transients on 24-V PLC buses, preserving sub-mA resolution in factory automation |
Applications
| PLC 24-V DC Bus Monitoring | Bi-directional Motor Control |
|---|---|
Use Scenario: Real-time current monitoring of 24-V DC power distribution in programmable logic controllers to detect short circuits and overload conditions before thermal shutdown. IC Role / Device Role / Timing Role: High-side current shunt monitor converting millivolt-level shunt voltage into amplified, referenced analog output for microcontroller ADC sampling. Use Value: Enables <2% total error current measurement across –14 V to +80 V common-mode range, satisfying SIL-2 functional safety pre-checks in industrial control cabinets. |
Use Scenario: Closed-loop torque and direction control in brushed DC or BLDC motor drivers where both motoring and regenerative braking currents must be measured. IC Role / Device Role / Timing Role: Bidirectional current sensor using REF1/REF2 pins to set zero-current output at mid-supply, supporting symmetric positive/negative current reporting. Use Value: Delivers 1000× gain and 70-µV offset to resolve ±10 mA changes in 100-mΩ shunt-critical for precise PWM-based current regulation at 20 kHz switching frequencies. |
| Solar Inverter String Monitoring | Aerospace 28-V Auxiliary Power |
Use Scenario: Monitoring individual photovoltaic string currents in central inverters to identify panel degradation, shading faults, or open-circuit failures. IC Role / Device Role / Timing Role: High-common-mode voltage sensor placed between PV array positive rail and MPPT converter input, rejecting up to +80 V common-mode swing. Use Value: Maintains >130 dB CMRR at DC–10 Hz to suppress 50/60 Hz leakage and switching noise from adjacent power stages-ensuring reliable fault detection in multi-string architectures. |
Use Scenario: Measuring auxiliary 28-V DC power feed current in avionics subsystems where supply may dip to –12 V during cold cranking or surge to +40 V during load dump. IC Role / Device Role / Timing Role: Robust current monitor with –14 V to +80 V input range and ±45 V overvoltage tolerance, interfaced to isolated ADC via reinforced insulation barrier. Use Value: Survives 1-kV EFT bursts per IEC61000-4-4 when paired with SMBJ40A/SMAJ7.0A TVS network-validated in TI TIDU227 for DO-160 Section 22 compliance readiness. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-side current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA285AIDR | Same 1000× gain, –14 V to +80 V range, and 70-µV offset, but in SOIC-8 (D) package with larger 6.2-mm × 5.3-mm footprint and no thermal pad | Preferred for prototyping or lower-power PCBs where thermal dissipation is less critical and manual soldering is used | Select INA285AIDR if board space permits larger package and thermal management is handled externally |
| INA293A1IDBVR | 100× gain (not 1000×), 20-V/V to 500-V/V selectable via external resistor, 30-µV offset, and 2.7–20-V supply range | Better suited for higher-current, lower-precision applications (e.g., 10-A battery packs) where gain flexibility outweighs fixed-ratio simplicity | Choose INA293A1IDBVR only when adjustable gain and lower offset are prioritized over guaranteed 1000× scaling and EFT-validated layout compatibility |
Compared with INA285AIDR, the INA285AIDGKR offers superior thermal performance in compact layouts and matches TIDU227's validated EMC filter placement; versus INA293A1IDBVR, it trades gain flexibility for deterministic 1000× scaling, tighter production tolerance, and direct drop-in use in existing 1000× reference designs.
Availability
INA285AIDGKR is available at Aetrix Electronics and suitable for factory automation, motor control, solar inverter, aerospace auxiliary power, and smart battery pack applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for INA285AIDGKR 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, embedded processing, and digital signal technologies, with over 50 years of innovation in precision analog ICs.
The INA28x family-including INA285AIDGKR-is designed for high-accuracy, high-common-mode current sensing in industrial, automotive, and renewable energy systems where reliability under voltage transients is mandatory.
FAQ
What is the maximum common-mode voltage the INA285AIDGKR can handle?
The INA285AIDGKR supports a common-mode input voltage range of –14 V to +80 V, independent of its supply voltage. This means it can accurately measure current across a shunt resistor even when the shunt's high-side node sits at +80 V while the device itself is powered from a 5-V supply. This capability is confirmed in TI's TIDU227 reference design and datasheet SBOS485.
Does the INA285AIDGKR support bidirectional current sensing?
Yes, the INA285AIDGKR supports bidirectional current sensing through its dual reference inputs (REF1 and REF2). When configured with appropriate external biasing, the output centers at VREF = (REF1 + REF2)/2, allowing positive current to drive VOUT above VREF and negative current below it. This functionality is explicitly documented in the "Theory of Operation" section of TI's TIDU227 design guide.
What is the typical supply current consumption of the INA285AIDGKR?
The INA285AIDGKR draws a maximum supply current of 900 µA across its full operating temperature and supply voltage range (2.7 V to 18 V). Typical quiescent current is lower, but design margin must assume the 900-µA worst-case value for power budgeting in battery-powered or thermally constrained applications such as smart battery packs.
Can the INA285AIDGKR be used without external overvoltage protection?
The INA285AIDGKR includes internal overvoltage protection rated to ±45 V on its input pins. For applications where common-mode transients stay within this limit-such as 24-V industrial buses with controlled switching-it may operate safely without external TVS diodes. However, TI's TIDU227 validates use with SMBJ40A/SMAJ7.0A TVS devices for full 1-kV EFT compliance, especially in uncontrolled environments like factory floors or aerospace power systems.
What package type is the INA285AIDGKR supplied in?
The INA285AIDGKR is supplied in an 8-pin VSSOP package (DGK suffix), measuring 3.0 mm × 3.0 mm with 0.65-mm lead pitch and an exposed thermal pad. This compact, surface-mount package supports high-density PCB layouts and provides better thermal performance than the SOIC-8 option (INA285AIDR), especially in continuous-current monitoring applications.
INA285AIDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-VSSOP
INA285AIDGKR FAQ
1.How can I place an order for INA285AIDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA285AIDGKR 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 INA285AIDGKR reliable?
The price and inventory of INA285AIDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA285AIDGKR is usually 5 days.
3.What payment methods are accepted for INA285AIDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA285AIDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA285AIDGKR?
INA285AIDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA285AIDGKR 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 INA285AIDGKR?
For technical support, including INA285AIDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA285AIDGKR requirements.
6.How does Aetrix verify that INA285AIDGKR is sourced from the original manufacturer or authorized distributors?
All INA285AIDGKR 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 INA285AIDGKR meets industry standards.
7.What is the process for return or replacement of INA285AIDGKR?
All INA285AIDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA285AIDGKR, 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 INA285AIDGKR part is unused and in its original packaging.
Return procedure for INA285AIDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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