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Texas Instruments INA2191A1IYBJR
- Part No.:
- INA2191A1IYBJR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
INA2191A1IYBJR.pdf
- Description:
- IC CURR SENSE 2 CIRCUIT 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:352
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Product details
Overview
INA2191A1IYBJR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier in a 12-pin DSBGA package, featuring 25 V/V fixed gain, ±0.25% max gain error, ±12 µV offset voltage, and 100 pA typical input bias current. It operates from 1.7 V to 5.5 V supply and supports common-mode voltages from –0.2 V to +40 V - enabling accurate µA-range current measurement in battery-powered power management systems.
For engineers reviewing the INA2191A1IYBJR datasheet, INA2191A1IYBJR pinout, INA2191A1IYBJR application, or INA2191A1IYBJR equivalent, this page delivers verified specifications, dual-channel bidirectional sensing context, WCSP package layout guidance, and real-world implementation constraints for high-accuracy, low-power shunt monitoring in space-constrained portable electronics.
Technical Context
The INA2191A1IYBJR integrates two independent, zero-drift current-sense amplifier channels in a single 1.17 mm × 1.53 mm DSBGA-12 package. Each channel features separate ENABLE pins (ENABLE1/ENABLE2), REF inputs (REF1/REF2), and analog outputs (OUT1/OUT2), supporting independent bidirectional current sensing with user-defined reference offsets.
Its capacitively coupled input stage achieves 100 pA typical input bias current and 130 nV/°C max offset drift, while the 45 kHz bandwidth (A1 gain) and 1.7–5.5 V supply range enable operation in ultra-low-power, wide-input-voltage applications - including battery fuel gauging and multi-rail power supervision where input leakage must not perturb µA-level currents.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 25 V/V - sets output voltage = 25 × (VIN+ − VIN−) + VREF, enabling precise low-gain scaling for high-current, low-shunt-resistor designs. |
| Max Gain Error | ±0.25% - ensures full-scale current measurement error remains under 0.25% across temperature, critical for battery charge/discharge accuracy. |
| Offset Voltage | ±12 µV max - allows accurate sensing down to sub-millivolt shunt drops, supporting <100 µA current resolution with 100 mΩ shunts. |
| Input Bias Current | 100 pA typical - minimizes error from shunt resistor self-heating and enables use of high-value sense resistors without loading effects. |
| Common-Mode Range | –0.2 V to +40 V - permits direct high-side sensing on 36-V battery rails or telecom supplies without level-shifting circuitry. |
| Supply Voltage | 1.7 V to 5.5 V - compatible with Li-ion, coin-cell, and USB-powered systems; quiescent current scales linearly with VS. |
| Quiescent Current | 96–130 µA (dual enabled) - enables always-on current monitoring in portable devices with minimal battery drain impact. |
Pinout & Package
INA2191A1IYBJR is housed in a 1.17 mm × 1.53 mm, 12-pin DSBGA (YBJ) package with bottom-side solder balls. The package supports fine-pitch PCB assembly and provides thermal performance of RθJA = 94.1°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+1, IN+2 | Analog input (positive) | Connect to bus side of shunt for high-side sensing or load side for low-side sensing per channel. |
| IN−1, IN−2 | Analog input (negative) | Connect to load side (high-side) or ground side (low-side) of shunt - differential pair defines sensed current polarity. |
| OUT1, OUT2 | Analog output | Voltage = G × (VIN+ − VIN−) + VREF; rail-to-rail swing capability supports direct ADC interfacing. |
| REF1, REF2 | Analog reference input | DC offset applied to output; enables bidirectional sensing (e.g., 0 V → negative current, VS/2 → centered zero). |
| ENABLE1, ENABLE2 | Digital enable control | Active-high logic; drives corresponding channel into high-Z output and reduces supply current to ≤200 nA when both are low. |
| VS | Power supply | Single 1.7–5.5 V rail powers both channels and internal references; no external regulation required. |
| GND | Analog ground | Common return for all analog signals and supply; must be low-impedance and separated from digital ground in mixed-signal layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional dual-channel sensing | Independent IN+/IN−, REF, and ENABLE per channel enables simultaneous monitoring of charge and discharge paths or redundant rail supervision. |
| Ultra-low input bias current (100 pA) | Eliminates measurement error from shunt resistor leakage and permits use of >1 Ω sense resistors for µA-resolution battery monitoring. |
| Zero-drift architecture | Ensures ±12 µV offset and 0.13 µV/°C drift - maintains accuracy over –40°C to +125°C without calibration. |
| High CMRR (132 dB min) | Rejects noise from noisy power rails (e.g., DC-DC switching) even at 40 V common-mode, preserving signal integrity in dense PCBs. |
| Enable-controlled shutdown | Reduces total quiescent current to ≤200 nA (both channels disabled), extending battery life in sleep-mode IoT endpoints. |
Applications
| Battery Fuel Gauging | USB-C Power Delivery Monitoring |
|---|---|
|
Use Scenario: Real-time tracking of charge/discharge current in smart batteries for laptops or medical wearables. IC Role / Device Role / Timing Role: Dual-channel bidirectional current sense amplifier with independent REF and ENABLE pins per channel. Use Value: 100 pA input bias enables accurate µA-level current detection across full battery SOC; ±0.25% gain error ensures coulomb counting accuracy within 0.5% over lifetime. |
Use Scenario: Simultaneous monitoring of source and sink current on USB-C PD ports during dynamic power role swapping. IC Role / Device Role / Timing Role: Dual-channel, high-CMRR current sense amplifier supporting ±40 V common-mode and fast enable/disable transitions. Use Value: Independent ENABLE1/ENABLE2 allow synchronized channel activation during role swap; 45 kHz bandwidth captures transient PD negotiation events without aliasing. |
| Telecom Power Shelf Supervision | Low-Power IoT Sensor Node Power Management |
|
Use Scenario: Monitoring individual 48-V DC distribution rails in telecom base station power shelves for fault detection and load balancing. IC Role / Device Role / Timing Role: High-voltage, bidirectional current sense amplifier with 40 V common-mode tolerance and rail-to-rail output swing. Use Value: –0.2 V to +40 V input range enables direct high-side sensing on 48-V rails; 1.7 V minimum supply allows operation from auxiliary LDOs during brownout conditions. |
Use Scenario: Always-on current profiling of ultra-low-power sensor nodes powered by coin cells or energy harvesters. IC Role / Device Role / Timing Role: Micropower dual-channel current monitor with 200 nA shutdown current and 100 pA input bias. Use Value: Sub-µA quiescent current extends 10-year coin-cell life; low input bias prevents parasitic discharge of storage capacitors in energy-harvesting circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2290AIRGET | Single-channel, 80-V common-mode, 10-ppm/°C gain drift, no REF pin, 1.8-V min supply. | Lacks bidirectional offset control and dual-channel integration; suited for unidirectional high-voltage industrial monitoring only. | Select when 80-V common-mode or lower gain drift is prioritized over dual-channel flexibility and µA-level bias current. |
| MAX40086ETA+T | Single-channel, 65-V common-mode, 500 pA input bias, no enable, 2.7–5.5 V supply, 12-bit integrated ADC. | Includes on-chip ADC but higher input bias limits µA-resolution; no enable or REF pins restrict bidirectional and low-power use cases. | Select when integrated digitization is preferred and system-level µA accuracy is not required - avoids external ADC but sacrifices precision and power control. |
Compared with INA2191A1IYBJR, INA2290AIRGET offers higher voltage rating but lacks dual-channel operation and REF-based bidirectionality, while MAX40086ETA+T trades ultra-low bias current and enable control for integrated conversion - making INA2191A1IYBJR uniquely suited for compact, battery-sensitive dual-rail monitoring.
Availability
INA2191A1IYBJR is available at Aetrix Electronics and suitable for battery fuel gauging, USB-C power delivery monitoring, and telecom power shelf supervision requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA2191A1IYBJR 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 family was designed specifically for ultra-precise, low-power current sensing in space-constrained portable and battery-operated systems - emphasizing picoamp input bias, wide common-mode range, and dual-channel integration in WCSP packages.
FAQ
What is the maximum common-mode voltage supported by the INA2191A1IYBJR?
The INA2191A1IYBJR supports a common-mode input voltage range of –0.2 V to +40 V, independent of its 1.7–5.5 V supply voltage. This allows direct high-side sensing on 36-V battery systems or 48-V telecom rails without external level-shifting circuitry. The specification is guaranteed across the full –40°C to +125°C operating temperature range, and the device maintains ±0.25% gain accuracy within this range.
How does the REF pin enable bidirectional current sensing in the INA2191A1IYBJR?
The REF1 and REF2 pins on the INA2191A1IYBJR set the output DC offset for each channel: OUTx = G × (VIN+x − VIN−x) + VREFx. Applying VS/2 to REF1/REF2 centers the output at mid-supply, so positive shunt voltage produces output above VS/2 (forward current) and negative shunt voltage produces output below VS/2 (reverse current). This enables true bidirectional measurement with a single-ended ADC.
What is the quiescent current of the INA2191A1IYBJR when both channels are enabled versus disabled?
When both channels are enabled, the INA2191A1IYBJR draws 96–130 µA (typical to max) at 1.8 V supply and 25°C. When both ENABLE1 and ENABLE2 are driven low, quiescent current drops to ≤200 nA - a reduction of >600×. This ultra-low shutdown current is critical for battery-powered systems requiring years of shelf life or intermittent wake-up operation.
Can the INA2191A1IYBJR be used with a 1.7-V supply and still meet its specified accuracy?
Yes - the INA2191A1IYBJR is fully specified from 1.7 V to 5.5 V supply. At 1.7 V, it maintains ±0.25% max gain error, ±12 µV offset voltage, and 45 kHz bandwidth (A1 gain). Quiescent current increases slightly at lower VS (e.g., 130 µA max at 1.8 V), but all key electrical characteristics remain valid, enabling operation directly from single-cell Li-ion or coin-cell sources.
What package type and dimensions does the INA2191A1IYBJR use, and what are its thermal characteristics?
The INA2191A1IYBJR uses a 12-pin DSBGA (YBJ) package measuring 1.17 mm × 1.53 mm with 0.4-mm ball pitch. Its thermal resistance is RθJA = 94.1°C/W (JEDEC JESD51-7), RθJB = 23.8°C/W, and RθJC(top) = 0.6°C/W. These values support reliable operation up to +125°C ambient in compact layouts when using standard 2-layer PCBs with thermal vias under the exposed die pad.
INA2191A1IYBJR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.3V/µs
- Gain Bandwidth Product:
- 45 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 nA
- Voltage - Input Offset:
- 2.5 µV
- Current - Supply:
- 86µA
- 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:
- 12-DSBGA
INA2191A1IYBJR FAQ
1.How can I place an order for INA2191A1IYBJR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2191A1IYBJR 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 INA2191A1IYBJR reliable?
The price and inventory of INA2191A1IYBJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2191A1IYBJR is usually 5 days.
3.What payment methods are accepted for INA2191A1IYBJR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2191A1IYBJR transactions.
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4.How is shipping managed for INA2191A1IYBJR?
INA2191A1IYBJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2191A1IYBJR 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 INA2191A1IYBJR?
For technical support, including INA2191A1IYBJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2191A1IYBJR requirements.
6.How does Aetrix verify that INA2191A1IYBJR is sourced from the original manufacturer or authorized distributors?
All INA2191A1IYBJR 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 INA2191A1IYBJR meets industry standards.
7.What is the process for return or replacement of INA2191A1IYBJR?
All INA2191A1IYBJR units undergo pre-shipment inspection (PSI). If there is an issue with INA2191A1IYBJR, 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 INA2191A1IYBJR part is unused and in its original packaging.
Return procedure for INA2191A1IYBJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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