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Texas Instruments INA191A2IYFDR
- Part No.:
- INA191A2IYFDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 6-XFBGA, DSBGA
- Datasheet:
-
INA191A2IYFDR.pdf
- Description:
- IC CURR SENSE 1 CIRCUIT 6DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,626
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Product details
Overview
INA191A2IYFDR from Texas Instruments is a unidirectional, ultra-precise current sense amplifier in a 6-pin DSBGA package, designed for high-side and low-side shunt monitoring with ±0.25% max gain error, ±12 µV max offset voltage, and 50 V/V fixed gain. It operates from 1.7 V to 5.5 V supply, supports –0.2 V to +40 V common-mode input range, and enables microamp-level current measurement in battery-powered power management systems.
For engineers reviewing the INA191A2IYFDR datasheet, INA191A2IYFDR pinout, INA191A2IYFDR application, or INA191A2IYFDR equivalent, this page delivers verified specifications, validated pin functions, confirmed use cases in portable electronics and telecom power rails, and two technically documented alternative parts - all aligned to TI's production data sheet SLYS020C (August 2021 revision).
Technical Context
The INA191A2IYFDR implements a zero-drift, capacitively coupled input stage followed by a precision difference amplifier output stage - enabling picoampere-level input bias current (100 pA typical) and sub-μV/°C offset drift (0.13 μV/°C max). Its architecture eliminates resistor-based gain networks, reducing input current draw and enabling accurate sensing across wide common-mode ranges independent of supply voltage.
This device operates exclusively in unidirectional mode (no REF pin), with ENABLE-driven shutdown reducing quiescent current to 100 nA max. It delivers 37 kHz bandwidth at 50 V/V gain, 0.3 V/µs slew rate, and 30 µs settling time to 1%, supporting fast transient response in overcurrent protection and closed-loop battery charge control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 50 V/V - fixed ratio; outputs 50× sensed shunt voltage, enabling precise scaling into ADC input ranges without external gain stages. |
| Max Gain Error | ±0.25% - limits full-scale current measurement error to ≤0.25% at room temperature, critical for battery fuel gauging accuracy. |
| Offset Voltage | ±12 µV max - allows use of <10 mΩ shunts while maintaining µA-level resolution, minimizing I²R loss in power-constrained designs. |
| Input Bias Current | 100 pA typical - enables stable operation with high-value shunts (>1 Ω) and prevents loading errors in ultra-low-current monitoring. |
| Common-Mode Range | –0.2 V to +40 V - supports direct sensing on 12 V, 24 V, and 36 V rails without level-shifting, even when VS = 1.8 V. |
| Supply Voltage | 1.7 V to 5.5 V - compatible with Li-ion battery discharge profiles and single-supply microcontroller interfaces. |
| Quiescent Current | 43 µA typ at 25°C - ensures minimal standby power draw in always-on system monitors and IoT endpoint sensors. |
Pinout & Package
INA191A2IYFDR is housed in a 1.17 mm × 0.765 mm, 6-pin DSBGA (YFD) package with bottom-side solder balls. The package supports fine-pitch PCB assembly and offers low thermal resistance (RθJA = 141.4°C/W) for compact, thermally constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Analog input (positive) | Connects to bus side of shunt in high-side sensing or load side in low-side sensing; referenced to IN– for differential measurement. |
| IN– | Analog input (negative) | Connects to load side of shunt in high-side sensing or ground side in low-side sensing; forms differential pair with IN+. |
| VS | Analog power supply | Accepts 1.7–5.5 V; powers internal amplifiers and ENABLE logic; independent of common-mode input voltage. |
| GND | Analog ground reference | System ground return for internal circuitry; must be tied to same potential as shunt resistor ground node in low-side configurations. |
| OUT | Analog voltage output | Provides rail-to-rail-capable output proportional to (IN+ − IN–) × 50; drives 10 kΩ loads with <1 mV error near rails. |
| ENABLE | Digital enable input | Active-high (VIH ≥ 1.35 V); places OUT in high-Z state and reduces IQ to ≤100 nA when driven low, enabling dynamic power gating. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 100 pA typical - eliminates shunt voltage error from input current, enabling accurate µA-range measurements with >1 Ω resistors. |
| Zero-drift architecture | 0.13 µV/°C max offset drift - maintains calibration stability across –40°C to +125°C, eliminating need for periodic offset correction in automotive modules. |
| High CMRR | 132 dB min (RTI) - rejects noise from noisy power rails (e.g., DC-DC switching nodes), preserving signal integrity in dense PCB layouts. |
| Enable-controlled shutdown | 100 nA max disabled IQ - reduces system standby power by >99.8% vs. active mode, extending battery life in portable medical devices. |
| Wide supply range | 1.7 V to 5.5 V - interoperates with 1.8 V MCUs, 3.3 V FPGAs, and 5 V analog front-ends without level shifters or regulators. |
Applications
| Battery Fuel Gauging | USB-C Power Delivery Monitoring |
|---|---|
|
Use Scenario: Real-time tracking of charge/discharge current in lithium-ion battery packs for notebook computers and tablets. IC Role / Device Role / Timing Role: Unidirectional current sense amplifier measuring voltage drop across low-value shunt in battery path; provides analog output to MCU ADC. Use Value: ±0.25% gain error and ±12 µV offset enable <1% SOC error over full battery cycle; 100 pA bias current prevents self-discharge measurement artifacts. |
Use Scenario: Accurate current monitoring on 5 V–20 V USB-C power delivery lines to enforce safety limits and negotiate power contracts. IC Role / Device Role / Timing Role: High-side current sensor placed between source and connector; withstands up to 40 V common-mode while powered from 3.3 V system rail. Use Value: –0.2 V to +40 V common-mode range covers entire USB PD specification; 37 kHz bandwidth captures fast load transients during protocol handshaking. |
| Telecom DC Power Shelf Sensing | Industrial PLC Analog Input Modules |
|
Use Scenario: Monitoring individual 48 V DC feed currents in telecom power distribution units to detect open-circuit or overload faults. IC Role / Device Role / Timing Role: High-side shunt monitor on each 48 V output branch; outputs scaled voltage to isolated ADC or fault controller. Use Value: 40 V common-mode rating accommodates 48 V nominal with margin; ±0.25% gain error ensures reliable trip-point detection across temperature. |
Use Scenario: Precision current measurement in 4–20 mA loop-powered sensor inputs for factory automation controllers. IC Role / Device Role / Timing Role: Low-side current sense amplifier placed between field transmitter and PLC ground; measures loop current via shunt resistor. Use Value: 1.7 V minimum supply enables operation directly from loop power; 100 pA input bias avoids injecting error into 4 mA zero point. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2191A2IYBJR | Dual-channel, 12-pin DSBGA, includes REF pins for bidirectional sensing; higher quiescent current (96 µA typ enabled). | Supports bidirectional current flow (e.g., battery charge/discharge monitoring); requires separate REF voltage source per channel. | Select when dual independent sensing paths or true bidirectional capability are required; not pin-compatible with INA191A2IYFDR. |
| INA185A2IDR | Same 6-pin DSBGA package, 50 V/V gain, but higher offset (±50 µV max) and no ENABLE pin; 125°C max operating temperature. | Lacks shutdown mode - unsuitable for battery-critical low-power sleep states; lower accuracy limits µA-resolution use. | Choose only if ENABLE functionality is unnecessary and cost is prioritized over precision and ultra-low IQ. |
Compared with INA2191A2IYBJR and INA185A2IDR, the INA191A2IYFDR uniquely combines unidirectional 50 V/V gain, 100 pA input bias, ENABLE-driven 100 nA shutdown, and ±0.25% gain error in a space-constrained 6-pin DSBGA - making it optimal for single-path, battery-sensitive, high-accuracy current monitoring where bidirectionality is not needed.
Availability
INA191A2IYFDR is available at Aetrix Electronics and suitable for notebook computers, USB-C power delivery systems, and telecom DC power shelves requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA191A2IYFDR 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 INAx191 product line was engineered specifically for ultra-low-power, high-accuracy current sensing in space- and energy-constrained applications - including portable electronics, battery management, and telecom infrastructure - where picoampere input bias and sub-0.3% gain error are mandatory.
FAQ
What is the maximum common-mode voltage the INA191A2IYFDR can handle?
The INA191A2IYFDR supports a common-mode input voltage range of –0.2 V to +40 V. This allows it to accurately sense current on 12 V, 24 V, and 36 V power rails - even when powered from a low 1.8 V supply. The specification is tested and guaranteed across the full –40°C to +125°C operating temperature range, and applies independently of the VS supply voltage.
Does the INA191A2IYFDR support bidirectional current sensing?
No, the INA191A2IYFDR does not support bidirectional current sensing. It is a unidirectional current sense amplifier with no REF pin. Bidirectional capability is exclusive to the INA2191 family (e.g., INA2191A2IYBJR), which includes dedicated REF inputs per channel. The INA191A2IYFDR's architecture is optimized for single-direction measurement with minimal offset and ultra-low bias current.
What is the typical quiescent current of the INA191A2IYFDR at 25°C?
The typical quiescent current of the INA191A2IYFDR is 43 µA at 25°C with VS = 1.8 V and VSENSE = 0 mV. Under worst-case conditions across temperature (–40°C to +125°C), the maximum quiescent current remains ≤85 µA. When disabled via the ENABLE pin, quiescent current drops to ≤100 nA - a reduction of over 400×.
Can the INA191A2IYFDR be used with a 1.7 V supply?
Yes, the INA191A2IYFDR is fully specified to operate down to 1.7 V supply voltage. All key parameters - including gain error (±0.25%), offset voltage (±12 µV), and output swing - are guaranteed across the full 1.7 V to 5.5 V range. This makes it suitable for direct interfacing with deeply discharged Li-ion batteries or low-voltage microcontrollers.
What package type and dimensions does the INA191A2IYFDR use?
The INA191A2IYFDR uses a 6-pin DSBGA (Die Size Ball Grid Array) package designated YFD, with nominal body dimensions of 1.17 mm × 0.765 mm and a footprint area of 0.895 mm². It features bottom-side solder balls for compact PCB integration and is RoHS-compliant. The package is distinct from the larger 12-pin YBJ used by the dual-channel INA2191.
INA191A2IYFDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 6-XFBGA, DSBGA
- 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:
- 37 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 pA
- Voltage - Input Offset:
- 2.5 µV
- Current - Supply:
- 43µA
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DSBGA (1.17x0.77)
INA191A2IYFDR FAQ
1.How can I place an order for INA191A2IYFDR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA191A2IYFDR 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 INA191A2IYFDR reliable?
The price and inventory of INA191A2IYFDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA191A2IYFDR is usually 5 days.
3.What payment methods are accepted for INA191A2IYFDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA191A2IYFDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA191A2IYFDR?
INA191A2IYFDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA191A2IYFDR 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 INA191A2IYFDR?
For technical support, including INA191A2IYFDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA191A2IYFDR requirements.
6.How does Aetrix verify that INA191A2IYFDR is sourced from the original manufacturer or authorized distributors?
All INA191A2IYFDR 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 INA191A2IYFDR meets industry standards.
7.What is the process for return or replacement of INA191A2IYFDR?
All INA191A2IYFDR units undergo pre-shipment inspection (PSI). If there is an issue with INA191A2IYFDR, 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 INA191A2IYFDR part is unused and in its original packaging.
Return procedure for INA191A2IYFDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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