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Texas Instruments INA285AID
- Part No.:
- INA285AID
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA285AID.pdf
- Description:
- IC CURRENT MONITOR 0.4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,096
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Product details
Overview
INA285AID from Texas Instruments is a high-accuracy, bidirectional current shunt monitor with zero-drift architecture, designed for precision sensing across shunts at common-mode voltages from –14 V to +80 V. It delivers 1000 V/V fixed gain, ±20 µV max offset voltage, 0.3 µV/°C max offset drift, and operates from a single 2.7 V to 18 V supply - enabling low-loss, high-dynamic-range current measurement in automotive battery management and solar inverter DC-link monitoring.
For engineers reviewing the INA285AID datasheet, INA285AID pinout, INA285AID application, or INA285AID equivalent, key selection considerations include its 2 kHz effective bandwidth, 140 dB CMRR, GND-referenced or rail-referenced output configuration via REF1/REF2 pins, and SOIC-8/VSSOP-8 package compatibility with high-voltage PCB layout constraints.
Technical Context
The INA285AID implements a switched-capacitor zero-drift input stage that enables ultra-low offset and near-zero drift over –40°C to +125°C, supporting accurate 10 mV full-scale shunt sensing. Its differential input structure rejects common-mode transients up to 80 V while maintaining 120–140 dB CMRR across frequency.
Reference inputs (REF1, REF2) form an internal resistive divider to set quiescent output voltage - enabling unidirectional (GND- or V+-referenced) or bidirectional (mid-supply referenced) operation without external components. The device draws ≤900 µA quiescent current and features 1.5 Ω output impedance with 1 nF capacitive load stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 1000 V/V - fixed ratio; converts 10 mV shunt drop to 10 V output, enabling direct ADC interfacing without amplification. |
| Common-Mode Range | –14 V to +80 V - supports high-side sensing in 48 V telecom systems and reverse-battery tolerant automotive applications. |
| Offset Voltage (max) | ±20 µV - ensures ≤0.2% error at 10 mV full-scale, critical for low-power battery monitoring accuracy. |
| Offset Drift (max) | 0.3 µV/°C - maintains sub-0.5% total error over –40°C to +125°C, eliminating calibration in industrial environments. |
| CMRR (min) | 120 dB - suppresses noise from noisy power rails (e.g., motor drives), preserving signal integrity in EMI-heavy systems. |
| Supply Voltage | 2.7 V to 18 V - allows operation from single Li-ion cells up to 12 V automotive rails without LDOs. |
| Quiescent Current | 900 µA max - enables always-on current monitoring in energy-constrained IoT edge nodes. |
Pinout & Package
INA285AID is available in SOIC-8 (4.90 mm × 3.91 mm) and VSSOP-8 (3.00 mm × 3.00 mm) packages. Both variants share identical pinout and thermal performance characteristics per TI SBOS485C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: –IN | Analog input | Connects to load side of shunt resistor; forms differential pair with +IN for bidirectional current polarity detection. |
| 2: GND | Analog ground | Reference node for internal circuitry; must be tied to system analog ground with low-impedance path. |
| 3: REF2 | Analog reference input | One terminal of internal reference divider; sets output quiescent voltage when paired with REF1. |
| 4: NC | No connect | Internally unconnected; leave floating or tie to GND for mechanical stability - no electrical function. |
| 5: OUT | Analog output | Voltage output proportional to shunt voltage × 1000; drives 10 kΩ loads with <0.04 V headroom to GND at +125°C. |
| 6: V+ | Power supply | Single positive supply input (2.7–18 V); powers internal amplifier and reference circuitry. |
| 7: REF1 | Analog reference input | Second terminal of internal reference divider; identical function to REF2; average of REF1/REF2 defines output bias. |
| 8: +IN | Analog input | Connects to supply side of shunt resistor; completes differential sensing path for current direction and magnitude. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift architecture | Eliminates 1/f noise and thermal drift, enabling stable 10 mV full-scale sensing over temperature without recalibration. |
| Bidirectional current sensing | Supports both charge and discharge current measurement in battery packs via configurable REF1/REF2 reference biasing. |
| High common-mode transient immunity | Withstands –14 V to +80 V common-mode steps (e.g., automotive load dump) without external protection diodes. |
| Reference pin flexibility | Enables GND-, V+-, or mid-supply-referenced output using only REF1/REF2 connections - no external resistors required. |
| Low quiescent power | 900 µA max supply current allows integration into always-on subsystems without compromising battery life. |
Applications
| Automotive Battery Monitoring | Solar Inverter DC-Link Sensing |
|---|---|
Use Scenario: Real-time bidirectional current measurement in 48 V mild-hybrid battery systems during regenerative braking and engine start. IC Role / Device Role / Timing Role: Current shunt monitor converting millivolt-level shunt voltage to amplified analog output for MCU ADC sampling. Use Value: ±20 µV offset enables ±0.5 A resolution at 500 µΩ shunt, meeting ASIL-B functional safety current accuracy requirements. |
Use Scenario: High-side DC-link current sensing in string inverters with 1000 V bus voltage and fast switching transients. IC Role / Device Role / Timing Role: Isolation-free current monitor interfacing directly to isolated ADC, rejecting common-mode dv/dt noise. Use Value: 140 dB CMRR and –14 V to +80 V range allow safe operation during IGBT switching spikes without optocoupler isolation. |
| Telecom 48 V Power Shelf | Industrial Motor Drive Phase Current |
Use Scenario: Input current monitoring in redundant 48 V DC power distribution units with hot-swap capability. IC Role / Device Role / Timing Role: High-side current sensor feeding fault detection logic and digital power management ICs. Use Value: 1000 V/V gain provides sufficient signal swing for 12-bit ADCs even with 1 mΩ shunts, minimizing I²R losses. |
Use Scenario: Low-side phase current sensing in servo drives with PWM frequencies up to 20 kHz. IC Role / Device Role / Timing Role: Precision current amplifier driving isolated sigma-delta modulator inputs with minimal latency. Use Value: 2 kHz effective bandwidth supports accurate RMS current calculation across full PWM cycle without aliasing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current shunt monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A2IDR | 20 V/V gain, 100 kHz bandwidth, integrated 20 V surge protection, 50 µV offset | Better suited for high-bandwidth motor control; lacks 1000 V/V gain for ultra-low-shunt applications | Select for PWM-rich environments requiring faster response; avoid when 10 mV full-scale sensing is mandatory |
| MAX40056ASA+T | 100 V/V gain, 1 MHz bandwidth, ±12 V to +65 V common-mode, 5 µV offset | Higher bandwidth but narrower common-mode range; optimized for 12 V/24 V industrial PLCs | Prefer for high-speed closed-loop control; not suitable for 48 V telecom or 80 V automotive transients |
Compared with INA285AID, INA240A2IDR trades gain and ultra-low offset for higher bandwidth and built-in surge protection, while MAX40056ASA+T offers lower offset and higher speed but sacrifices common-mode range and gain - making INA285AID uniquely suited for precision, low-shunt, high-common-mode applications.
Availability
INA285AID is available at Aetrix Electronics and suitable for automotive battery management, solar inverter DC-link monitoring, telecom 48 V power shelves, and industrial motor drive phase current sensing requiring stable component supply across extended temperature and high-voltage operating conditions.
Supply support for INA285AID 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 chain solutions.
The INA28x product line was designed specifically for high-accuracy, wide common-mode current sensing in automotive, industrial, and renewable energy systems - emphasizing zero-drift stability, robustness against voltage transients, and flexible reference configuration.
FAQ
What is the maximum common-mode voltage the INA285AID can handle?
The INA285AID supports a common-mode input voltage range of –14 V to +80 V, as specified in the absolute maximum ratings and recommended operating conditions. This allows safe high-side sensing in 48 V and 60 V systems, including automotive load-dump transients. Operation beyond +80 V or below –14 V risks permanent damage and is not supported - external clamping is required for higher transients.
Can the INA285AID measure bidirectional current, and how is it configured?
Yes, the INA285AID supports bidirectional current measurement by setting the quiescent output voltage to mid-supply using REF1 and REF2 pins. Connecting both pins to V+/2 (e.g., via a resistor divider) centers the output at half the supply voltage, allowing symmetric positive/negative output swing for forward/reverse current flow. This configuration requires no additional external op-amps or level-shifting circuitry.
What is the effective bandwidth of the INA285AID, and why is it limited to 2 kHz?
The INA285AID has an effective bandwidth of 2 kHz, as confirmed in the Electrical Characteristics table and Figure 1 of SBOS485C. This limitation arises from its switched-capacitor zero-drift architecture, which prioritizes ultra-low offset and drift over speed. The 2 kHz bandwidth remains sufficient for DC and low-frequency AC current monitoring in battery, power supply, and motor control applications where precision outweighs high-frequency response.
Does the INA285AID require external components for basic operation?
No, the INA285AID operates fully functional with only V+, GND, +IN, –IN, REF1, REF2, and OUT connected - no external resistors, capacitors, or references are needed for standard unidirectional or bidirectional configurations. External components are optional only for specialized cases like EMI filtering or enhanced transient suppression beyond the device's native –14 V to +80 V rating.
How does the zero-drift architecture of the INA285AID improve measurement accuracy?
The zero-drift architecture in the INA285AID uses auto-zeroing and chopper stabilization to reduce input offset voltage to ±20 µV max and offset drift to 0.3 µV/°C. This enables accurate current sensing down to 10 mV full-scale shunt drops - reducing power loss by 10× compared to conventional amplifiers requiring 100 mV drops - while maintaining stability across –40°C to +125°C without recalibration.
INA285AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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
INA285AID FAQ
1.How can I place an order for INA285AID through Aetrix?
Please submit a Request for Quotation (RFQ) for INA285AID 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 INA285AID reliable?
The price and inventory of INA285AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA285AID is usually 5 days.
3.What payment methods are accepted for INA285AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA285AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA285AID?
INA285AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA285AID 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 INA285AID?
For technical support, including INA285AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA285AID requirements.
6.How does Aetrix verify that INA285AID is sourced from the original manufacturer or authorized distributors?
All INA285AID 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 INA285AID meets industry standards.
7.What is the process for return or replacement of INA285AID?
All INA285AID units undergo pre-shipment inspection (PSI). If there is an issue with INA285AID, 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 INA285AID part is unused and in its original packaging.
Return procedure for INA285AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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