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Texas Instruments INA186A4QDDFRQ1
- Part No.:
- INA186A4QDDFRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8 Thin, TSOT-23-8
- Datasheet:
-
INA186A4QDDFRQ1.pdf
- Description:
- AEC-Q100, 40-V, BIDIRECTIONAL, H
- Quantity:
- Payment:
- Shipping:
Inventory:2,973
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Product details
Overview
INA186A4QDDFRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive current-sense amplifier optimized for bidirectional 12-V battery monitoring in body control modules and telematics units. It delivers 200 V/V fixed gain, ±1% max gain error, ±50 µV max offset voltage, and operates from 1.7 V to 5.5 V supply across –40°C to +125°C ambient. Its 40-V common-mode input range (–0.2 V to +40 V) supports direct connection to automotive battery rails.
For engineers reviewing the INA186A4QDDFRQ1 datasheet, INA186A4QDDFRQ1 pinout, INA186A4QDDFRQ1 application, or INA186A4QDDFRQ1 equivalent, this page provides verified technical context, package-specific pin functions, real-world automotive use cases, and validated alternative options - all grounded in TI's production-grade specifications for the DDF (SOT-23-8) variant.
Technical Context
The INA186A4QDDFRQ1 implements a capacitively coupled front-end architecture enabling high common-mode rejection (120 dB min) while decoupling input stage operation from supply voltage constraints. Its zero-drift topology ensures <0.5 µV/°C offset drift and supports microamp-level current sensing via large-value shunt resistors enabled by 500 pA typical input bias current.
This DDF-package variant integrates ENABLE and REF pins - enabling power-gated operation (<10 nA shutdown current) and true bidirectional current measurement via externally applied reference voltage. The device maintains 33 kHz bandwidth and rail-to-rail output swing (GND +1 mV / VS –40 mV) under full automotive temperature and supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200 V/V - fixed ratio enabling precise scaling of mV-level shunt voltage to measurable output range |
| Common-mode range | –0.2 V to +40 V - supports direct high-side sensing on 12-V battery with 42-V survivability margin |
| Input bias current | 500 pA typ - permits use of ≥10 kΩ shunt resistors for µA-range current detection without error inflation |
| Offset voltage | ±50 µV max - enables accurate low-current measurement even at near-zero differential input |
| Supply voltage | 1.7 V to 5.5 V - compatible with 1.8-V and 3.3-V microcontroller domains without level-shifting |
| Quiescent current | 48 µA typ (enabled), 10 nA typ (disabled) - extends battery life in periodic-monitoring BMS applications |
| CMRR | 120 dB min - rejects noise from noisy 12-V bus during simultaneous high-side/low-side sensing |
Pinout & Package
The INA186A4QDDFRQ1 is packaged in an 8-pin SOT-23 (DDF) variant measuring 2.90 mm × 1.60 mm, with wettable flanks and automotive-grade molding compound per AEC-Q100.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS | Power supply input | Accepts 1.7–5.5 V; powers internal amplifiers and ENABLE logic; must be bypassed with 0.1 µF capacitor |
| ENABLE | Digital enable control | Drives device ON (≥0.7×VS) or OFF (≤0.3×VS); reduces IQ to 10 nA and places OUT in high-Z state when low |
| REF | Bidirectional reference input | External voltage sets zero-current output level; enables symmetric positive/negative current reporting around VREF |
| GND | Analog ground reference | Return path for VS, IN±, and OUT; requires low-impedance PCB connection to minimize CMRR degradation |
| IN+ | Positive current-sense input | Connects to bus side of shunt in high-side config or load side in low-side config; withstands –0.2 V to +40 V |
| IN– | Negative current-sense input | Connects to load side of shunt in high-side config or ground side in low-side config; same voltage rating as IN+ |
| OUT | Analog output | Voltage = GAIN × (IN+ – IN–) + VREF; swings within 1 mV of GND and 40 mV of VS across full temp range |
| NC | No-connect terminal | Internally unconnected; may be left floating, grounded, or tied to VS without functional impact |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing with REF pin | Enables single-shunt monitoring of charge/discharge currents in 12-V BMS without polarity-switching circuitry |
| AEC-Q100 Grade 1 qualification | Validated operation from –40°C to +125°C ambient, supporting under-hood and cabin-mounted automotive ECUs |
| Functional safety documentation support | TI-provided FIT rate, failure mode analysis, and diagnostic coverage data aid ISO 26262 ASIL-B system design |
| Rail-to-rail output swing | Delivers full dynamic range from GND +1 mV to VS –40 mV, maximizing resolution on 1.8-V MCU ADC inputs |
| Low quiescent current with ENABLE | Reduces average system power by >99.9% during sleep cycles in telematics eCall wake-on-event architectures |
Applications
| Body Control Module (BCM) | Telematics Control Unit (TCU) |
|---|---|
Use Scenario: Real-time monitoring of door lock actuator, window lift motor, and lighting loads powered from 12-V battery. IC Role / Device Role / Timing Role: High-side current-sense amplifier measuring bidirectional load currents with ±1% accuracy across –40°C to +125°C. Use Value: Enables predictive fault detection (e.g., jammed window motor) via current signature analysis without adding shunt heating or layout complexity. |
Use Scenario: Detecting emergency call (eCall) activation by monitoring GSM module transmit current surges during crash events. IC Role / Device Role / Timing Role: Low-power, fast-settling (30 µs) current monitor interfaced to MCU ADC for event-triggered telemetry upload. Use Value: Confirms valid eCall initiation via current threshold crossing while rejecting battery ripple noise using 120 dB CMRR. |
| 12-V Battery Management System | Automotive Head Unit |
Use Scenario: Measuring bidirectional charge/discharge current in start-stop systems with lithium-ion auxiliary battery. IC Role / Device Role / Timing Role: Bidirectional current-sense amplifier using REF pin biased at VS/2 to center output for ±200 mA sensing range. Use Value: Eliminates need for dual-shunt or H-bridge sensing; achieves µA-level resolution via 500 pA input bias current and 200 V/V gain. |
Use Scenario: Monitoring audio amplifier supply current to detect short-circuit faults before thermal damage occurs. IC Role / Device Role / Timing Role: High-speed (33 kHz BW) current monitor placed on 12-V rail feeding Class-D amplifier stages. Use Value: Provides sub-100 µs fault response time via analog output to MCU comparator, preventing speaker coil burnout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A4QDRQ1 | Higher 80-V common-mode range; 100-ppm/°C gain drift vs. 10 ppm/°C; no REF pin; 5-pin SOIC package | Unidirectional only; suited for 24-V commercial vehicles but lacks bidirectional capability for BMS | Select when higher voltage tolerance is required and bidirectional sensing is unnecessary |
| MAX40056ATA+T | 250-V common-mode range; 150-µA IQ; no ENABLE pin; 6-pin WLP package; ±0.5% gain error | Designed for industrial HVDC systems; incompatible with automotive AEC-Q100 requirements | Select only for non-automotive 48-V+ applications where AEC-Q100 compliance is not mandated |
Compared with INA240A4QDRQ1 and MAX40056ATA+T, the INA186A4QDDFRQ1 uniquely combines AEC-Q100 Grade 1 qualification, ENABLE functionality, REF-based bidirectionality, and ultra-low 500-pA input bias current - making it the only option qualified for precision 12-V automotive BMS and BCM designs requiring µA-level resolution.
Availability
INA186A4QDDFRQ1 is available at Aetrix Electronics and suitable for body control modules, telematics control units, and 12-V battery management systems requiring stable component supply across automotive production lifecycles.
Supply support for INA186A4QDDFRQ1 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 automotive IC development and AEC-Q100 qualification expertise.
The INA186-Q1 product line was designed specifically for cost-sensitive, high-precision automotive current sensing - targeting 12-V battery monitoring in BCM, TCU, and head unit applications where low power, small size, and bidirectional capability are critical.
FAQ
What is the maximum common-mode voltage the INA186A4QDDFRQ1 can withstand?
The INA186A4QDDFRQ1 supports a continuous common-mode input range of –0.2 V to +40 V, with absolute maximum survivability up to +42 V. This makes it suitable for direct connection to automotive 12-V battery rails, including transient spikes during load dump events. The specification is validated across the full –40°C to +125°C operating temperature range and applies independently of the 1.7–5.5 V supply voltage.
Does the INA186A4QDDFRQ1 support bidirectional current sensing?
Yes, the INA186A4QDDFRQ1 supports true bidirectional current sensing via its dedicated REF pin. When a reference voltage (e.g., VS/2) is applied to REF, the output voltage centers at that level - allowing positive differential inputs (IN+ > IN–) to produce outputs above VREF and negative inputs to produce outputs below VREF. This capability is exclusive to SC70 and DDF packages; the DBV variant lacks REF and supports unidirectional operation only.
What is the purpose of the ENABLE pin on the INA186A4QDDFRQ1?
The ENABLE pin on the INA186A4QDDFRQ1 provides hardware-controlled power gating: driving it to VS activates normal operation (48 µA typical IQ), while pulling it to GND disables the amplifier, reducing supply current to 10 nA typical and placing the OUT pin in high-impedance state. This feature is essential for low-duty-cycle automotive monitoring applications like periodic BMS checks or wake-on-current eCall triggers.
How does the low input bias current of 500 pA benefit system design?
The 500 pA typical input bias current of the INA186A4QDDFRQ1 enables accurate measurement of very low currents (down to ~1 µA) using high-value shunt resistors (e.g., 10 kΩ), minimizing self-heating and power loss in the sense path. It also allows RC input filtering without introducing significant offset error - a key advantage over conventional current-sense amplifiers with µA-level bias currents that degrade accuracy when filters are added.
Is the INA186A4QDDFRQ1 pin-compatible with other variants in the INA186-Q1 family?
No - the INA186A4QDDFRQ1 uses the 8-pin DDF (SOT-23-8) package with ENABLE and REF pins, while the INA186A4QDCKRQ1 (SC70-6) lacks ENABLE and the INA186A4QDBVRQ1 (SOT-23-5) lacks both ENABLE and REF. Pin counts, pin functions, and package footprints differ across variants; PCB layout must be specific to the DDF package used by INA186A4QDDFRQ1.
INA186A4QDDFRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8 Thin, TSOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 33 kHz
- Current - Input Bias:
- 500 pA
- Voltage - Input Offset:
- 3 µV
- Current - Supply:
- 48µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 1.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-8
INA186A4QDDFRQ1 FAQ
1.How can I place an order for INA186A4QDDFRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA186A4QDDFRQ1 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 INA186A4QDDFRQ1 reliable?
The price and inventory of INA186A4QDDFRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA186A4QDDFRQ1 is usually 5 days.
3.What payment methods are accepted for INA186A4QDDFRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA186A4QDDFRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA186A4QDDFRQ1?
INA186A4QDDFRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA186A4QDDFRQ1 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 INA186A4QDDFRQ1?
For technical support, including INA186A4QDDFRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA186A4QDDFRQ1 requirements.
6.How does Aetrix verify that INA186A4QDDFRQ1 is sourced from the original manufacturer or authorized distributors?
All INA186A4QDDFRQ1 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 INA186A4QDDFRQ1 meets industry standards.
7.What is the process for return or replacement of INA186A4QDDFRQ1?
All INA186A4QDDFRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with INA186A4QDDFRQ1, 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 INA186A4QDDFRQ1 part is unused and in its original packaging.
Return procedure for INA186A4QDDFRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
INA186A4QDDFRQ1 Tags
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