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Texas Instruments INA185A1IDCKR
- Part No.:
- INA185A1IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
INA185A1IDCKR.pdf
- Description:
- INA185A1IDCKR
- Quantity:
- Payment:
- Shipping:
Inventory:1,218
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Product details
Overview
INA185A1IDCKR from Texas Instruments is a bidirectional, high-precision current-sense amplifier in SOT-563 (6-pin) package, designed for low-side and high-side sensing across –0.2 V to +26 V common-mode voltage range. It delivers 20 V/V fixed gain, ±0.2% max gain error, 350 kHz bandwidth, and ±55 µV max input offset at 0 V VCM - enabling accurate motor control and battery monitoring in space-constrained industrial power systems.
For engineers reviewing the INA185A1IDCKR datasheet, INA185A1IDCKR pinout, INA185A1IDCKR application, or INA185A1IDCKR equivalent, this page provides verified technical context, validated pin functions, real-world use cases in bidirectional current measurement, and confirmed alternative options with documented functional differences.
Technical Context
The INA185A1IDCKR employs a precision current-shunt monitor architecture with integrated matched resistor gain network, enabling rail-to-rail output swing (within 25 mV of VS and 3.5 mV of GND) and true bidirectional operation via REF pin biasing. Its internal topology decouples common-mode input range (–0.2 V to +26 V) from supply voltage (2.7 V to 5.5 V), supporting high-side sensing without level-shifting.
It achieves 350 kHz small-signal bandwidth and 2 V/µs slew rate while maintaining ±0.5 µV/°C max offset drift and 86 dB min CMRR over temperature. The device operates across –40°C to +125°C and draws ≤260 µA quiescent current - optimized for low-power, high-accuracy current feedback in motor drives and energy storage systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V - fixed, factory-trimmed ratio enabling direct conversion of shunt voltage to scaled output without external resistors. |
| Common-mode range | –0.2 V to +26 V - supports high-side sensing on 24-V bus rails and low-side sensing near ground, independent of 2.7–5.5-V supply. |
| Bandwidth | 350 kHz - enables accurate capture of fast transient currents in PWM-driven motor phases and inverter switching events. |
| Input offset voltage | ±55 µV max at 0 V VCM - ensures <100 µA error in 2-mΩ shunt at zero load, critical for battery SOC estimation accuracy. |
| Gain error | ±0.2% max - limits full-scale current measurement error to ≤2 mA in 1-A range, eliminating need for system-level calibration. |
| Quiescent current | 260 µA max - allows continuous monitoring in always-on battery management units without significant standby drain. |
| Slew rate | 2 V/µs - sustains linear output response during 100-mV step inputs, preventing distortion in closed-loop current regulation. |
Pinout & Package
SOT-563 (DRL) 6-pin ultra-small package: 1.6 mm × 1.6 mm × 0.55 mm body, 2.56 mm² total footprint including pins - 39% smaller than SC70, suitable for dense PCB layouts in portable and modular power electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Analog output | Single-ended voltage output referenced to GND; swings within 25 mV of VS and 3.5 mV of GND for maximum dynamic range. |
| GND (Pin 2) | Analog ground | Primary reference node for internal circuitry and output stage; must be connected to low-impedance system ground plane. |
| IN+ (Pin 3) | Positive input | Connects to bus-voltage side of shunt in high-side config or load side in low-side config; handles up to +26 V common-mode. |
| IN– (Pin 4) | Negative input | Connects to load side of shunt in high-side config or ground side in low-side config; supports –0.2 V common-mode for reverse-current detection. |
| REF (Pin 5) | Reference input | Bias point for bidirectional operation; sets zero-current output level (e.g., VS/2 for symmetric ± range). |
| VS (Pin 6) | Power supply | 2.7–5.5 V analog supply; powers internal amplifiers and gain network; bypass capacitor required at pin. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Enabled by REF pin biasing - supports charging/discharging current direction detection in battery packs and regenerative braking. |
| Rail-to-rail output swing | Output reaches within 25 mV of VS and 3.5 mV of GND - maximizes ADC utilization when interfacing with 3.3-V or 5-V microcontrollers. |
| Matched internal gain resistors | Eliminates external resistor matching errors and reduces temperature-induced gain drift to ≤8 ppm/°C. |
| High CMRR (86 dB min) | Maintains accuracy despite bus noise coupling into shunt node - critical for reliable operation in noisy motor drive environments. |
| Low offset drift (0.5 µV/°C) | Minimizes thermal-induced error in wide-temperature applications like automotive under-hood BMS or industrial inverters. |
Applications
| Motor Control | Battery Monitoring |
|---|---|
Use Scenario: Real-time phase current measurement in 3-phase BLDC motor drives using low-side shunts. IC Role / Device Role / Timing Role: Current-shunt monitor providing isolated, high-bandwidth feedback to MCU PWM controller for field-oriented control. Use Value: 350 kHz bandwidth captures rapid current transients during commutation; ±55 µV offset enables accurate stall detection at low speeds. |
Use Scenario: Bidirectional current sensing in lithium-ion battery protection circuits for charge/discharge cycle tracking. IC Role / Device Role / Timing Role: Precision current transducer feeding ADC input of battery management IC to compute state-of-charge (SOC) and health (SOH). Use Value: REF-biased operation enables single-supply measurement of both charge (+) and discharge (–) currents with shared ADC channel. |
| Power Management | Solar Inverters |
Use Scenario: Input/output current monitoring in DC-DC converters for server PSUs and telecom rectifiers. IC Role / Device Role / Timing Role: High-side current sense amplifier measuring bus current upstream of converter, rejecting switching noise via 86 dB CMRR. Use Value: –0.2 V to +26 V common-mode range accommodates 24-V input rails while operating from 3.3-V logic supply - no level shifters needed. |
Use Scenario: String current monitoring in photovoltaic combiner boxes for fault detection and MPPT optimization. IC Role / Device Role / Timing Role: Bidirectional shunt amplifier detecting reverse current flow during partial shading or module mismatch conditions. Use Value: 20 V/V gain and 260 µA quiescent current enable direct connection to string-level shunts with minimal self-heating and power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1IDR | Wider common-mode range (–4 V to +80 V); higher quiescent current (1.1 mA); same 20 V/V gain and SOT-23-8 package. | Required for >26 V bus voltages (e.g., 48-V industrial systems); less suitable for ultra-low-power battery monitoring. | Select INA240A1IDR only when sensing above +26 V common-mode; otherwise INA185A1IDCKR offers lower IQ and smaller footprint. |
| MAX40056ATA+T | 200 kHz bandwidth; ±150 µV max offset at 0 V VCM; 1.8–5.5 V supply; 6-pin WLP package (1.2 mm × 0.8 mm). | Better suited for space-constrained wearable BMS; lower bandwidth limits use in high-speed motor control. | Choose MAX40056ATA+T when board area is more critical than bandwidth; INA185A1IDCKR remains preferred for 350 kHz response needs. |
Compared with INA240A1IDR and MAX40056ATA+T, the INA185A1IDCKR uniquely balances ultra-small SOT-563 size, 350 kHz bandwidth, and sub-100 µV offset - making it optimal for compact, high-dynamic-range current sensing where bus voltage stays ≤26 V and supply current must stay <300 µA.
Availability
INA185A1IDCKR is available at Aetrix Electronics and suitable for motor control, battery monitoring, and solar inverter applications requiring stable component supply, extended temperature operation (–40°C to +125°C), and consistent parametric performance across production lots.
Supply support for INA185A1IDCKR 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 INA185 product line targets cost-sensitive, space-constrained current sensing in industrial motor drives, battery systems, and renewable energy inverters - emphasizing ultra-small packaging, wide common-mode range, and guaranteed gain/offset accuracy without external trimming.
FAQ
What is the maximum common-mode voltage supported by the INA185A1IDCKR?
The INA185A1IDCKR 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 bus rails without level-shifting circuitry. Operation beyond +26 V risks exceeding absolute maximum ratings and is not guaranteed.
How does the REF pin function in bidirectional current sensing with the INA185A1IDCKR?
The REF pin sets the zero-current output voltage level for the INA185A1IDCKR. When biased to mid-supply (e.g., 2.5 V on 5-V rail), positive differential input produces output above REF, and negative differential input produces output below REF - enabling full-scale measurement of both charge and discharge currents with one device.
What is the typical output swing capability of the INA185A1IDCKR relative to supply rails?
The INA185A1IDCKR delivers rail-to-rail output swing: within 25 mV of VS and 3.5 mV of GND under load. At 5-V supply, this yields ~4.975 V maximum and ~0.0035 V minimum output - maximizing dynamic range for 12-bit or higher ADCs without external level shifting.
Can the INA185A1IDCKR be used in unidirectional current sensing applications?
Yes - the INA185A1IDCKR supports unidirectional operation by connecting the REF pin to GND (for 0-V zero-current output) or to VS (for VS-rail saturated output). This simplifies interface with single-supply ADCs in applications like DC motor current limiting or LED driver monitoring.
What is the guaranteed gain error specification for the INA185A1IDCKR over temperature?
The INA185A1IDCKR has a maximum gain error of ±0.2% across the full operating temperature range of –40°C to +125°C. This specification includes both initial tolerance and temperature-induced drift, ensuring consistent scaling accuracy without system-level recalibration in harsh thermal environments.
INA185A1IDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Single Ended, Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 350 MHz
- Current - Input Bias:
- 75 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 200µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-6
INA185A1IDCKR FAQ
1.How can I place an order for INA185A1IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA185A1IDCKR 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 INA185A1IDCKR reliable?
The price and inventory of INA185A1IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA185A1IDCKR is usually 5 days.
3.What payment methods are accepted for INA185A1IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA185A1IDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA185A1IDCKR?
INA185A1IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA185A1IDCKR 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 INA185A1IDCKR?
For technical support, including INA185A1IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA185A1IDCKR requirements.
6.How does Aetrix verify that INA185A1IDCKR is sourced from the original manufacturer or authorized distributors?
All INA185A1IDCKR 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 INA185A1IDCKR meets industry standards.
7.What is the process for return or replacement of INA185A1IDCKR?
All INA185A1IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with INA185A1IDCKR, 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 INA185A1IDCKR part is unused and in its original packaging.
Return procedure for INA185A1IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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