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Texas Instruments INA2191A3IYBJR
- Part No.:
- INA2191A3IYBJR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
INA2191A3IYBJR.pdf
- Description:
- IC CURR SENSE 2 CIRCUIT 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,709
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Product details
Overview
INA2191A3IYBJR from Texas Instruments is a bidirectional, ultra-precise current sense amplifier in a 12-pin DSBGA package, featuring 100 V/V fixed gain, ±12 µV max offset voltage, 7 ppm/°C max gain drift, and –0.2 V to +40 V wide common-mode input range. It enables accurate microamp-level current measurement in battery-powered systems with dual-channel independent enable control.
For engineers reviewing the INA2191A3IYBJR datasheet, INA2191A3IYBJR pinout, INA2191A3IYBJR application, or INA2191A3IYBJR equivalent, key selection criteria include bidirectional sensing capability via REF1/REF2 pins, dual-channel independent shutdown (20–200 nA disabled quiescent current), picoamp input bias (100 pA typ), and guaranteed 0.25% max gain error across –40°C to +125°C.
Technical Context
The INA2191A3IYBJR implements a zero-drift, capacitively coupled input stage followed by a difference amplifier output stage to achieve ultra-low input bias current (100 pA typ) and minimal offset drift (0.13 µV/°C). Its dual-channel architecture supports independent high-side or low-side current monitoring with separate ENABLE1/ENABLE2 and REF1/REF2 pins.
Each channel operates with 1.7 V to 5.5 V supply, delivers 35 kHz bandwidth at 100 V/V gain, and maintains 132–150 dB CMRR over –0.2 V to +40 V common-mode range - enabling precise sensing on rails far exceeding VS, such as 12-V or 24-V battery buses while powered from 1.8-V or 3.3-V logic supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100 V/V - sets full-scale output = 100 × sensed shunt voltage; enables use of higher-value, lower-power shunts for µA-range measurement. |
| Max Gain Error | ±0.25% - ensures current measurement accuracy remains within 0.25% of true value at full scale, critical for battery fuel gauging and power budgeting. |
| Offset Voltage | ±12 µV max - allows accurate sensing down to ~120 nA with 100-mΩ shunt; extends dynamic range without requiring zero-calibration in system firmware. |
| Input Bias Current | 100 pA typical - minimizes error from shunt resistor self-heating and leakage paths; supports stable operation with MΩ-range sense resistors. |
| Common-Mode Range | –0.2 V to +40 V - permits direct connection to 36-V battery packs or 48-V telecom rails while operating from 1.8-V microcontroller supply. |
| Quiescent Current (dual enabled) | 96–130 µA at 25°C - enables always-on current monitoring in portable devices with sub-100-µA system sleep budgets. |
| Shutdown Current | 20–200 nA (both channels disabled) - reduces standby power to negligible levels in battery-backed applications like smart meters or wearables. |
Pinout & Package
INA2191A3IYBJR is packaged in a 1.17 mm × 1.53 mm, 12-ball DSBGA (YBJ) package with 0.4-mm pitch and bottom-side thermal pad. The package supports high-density PCB layouts and offers 94.1°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+1 / IN+2 | Analog input (ch1/ch2) | Connect to bus side of shunt for high-side sensing or load side for low-side sensing; each channel independently configurable. |
| IN–1 / IN–2 | Analog input (ch1/ch2) | Connect to load side (high-side) or ground side (low-side); differential pair defines sensed voltage drop across shunt resistor. |
| OUT1 / OUT2 | Analog output (ch1/ch2) | Voltage = G × (IN+ − IN−) + REFx; rail-to-rail capable with 23-mV headroom to VS and 50-µV headroom to GND. |
| REF1 / REF2 | Analog reference input (ch1/ch2) | DC offset setting pin - applying VS/2 enables bidirectional current detection (positive/negative flow) with single-supply operation. |
| ENABLE1 / ENABLE2 | Digital enable input (ch1/ch2) | Active-high logic: drive to VS to activate channel; drive to GND to disable (20–200 nA IQDIS); no external pull-up required. |
| VS | Power supply | 1.7–5.5 V analog supply; powers both channels and internal references; decoupling capacitor required per layout guidelines. |
| GND | Analog ground | Single-point return for all analog signals and supply; must be connected to system power ground with low-inductance path. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Enabled per channel via externally applied REF1/REF2 voltage (e.g., VS/2), allowing detection of charge/discharge direction in battery management. |
| Ultra-low input bias current | 100 pA typical - eliminates significant error sources in high-impedance shunt networks and enables stable µA-level measurements without calibration. |
| Zero-drift architecture | ±12 µV max offset and 0.13 µV/°C drift - maintains accuracy across industrial temperature range without system-level offset compensation. |
| Dual independent enable control | Separate ENABLE1/ENABLE2 pins allow selective channel shutdown - e.g., keep channel 1 active for battery monitoring while disabling channel 2 during sleep mode. |
| High CMRR at extended range | 132–150 dB CMRR from –0.2 V to +40 V - rejects noise from noisy DC bus voltages (e.g., motor drives or SMPS outputs) without external filtering. |
Applications
| Battery Fuel Gauging | USB-C Power Delivery Monitoring |
|---|---|
|
Use Scenario: Real-time tracking of charge/discharge current in lithium-ion battery packs for portable medical devices. IC Role / Device Role / Timing Role: Dual-channel INA2191A3IYBJR measures cell stack current (ch1) and protection circuit current (ch2) with independent enable timing to minimize system sleep current. Use Value: 100 pA input bias and ±12 µV offset enable <1 µA resolution; bidirectional REF-based sensing detects charging vs. discharging without polarity-switching hardware. |
Use Scenario: Accurate source/sink current measurement in USB-C PD controllers for laptop docking stations. IC Role / Device Role / Timing Role: INA2191A3IYBJR monitors VBUS current on both upstream and downstream ports using two independent channels with synchronized REF biasing. Use Value: 40-V common-mode range accommodates 20-V PD3.1 EPR voltages; 0.25% gain error ensures compliance with USB PD power budget reporting requirements. |
| Telecom Power Shelf Monitoring | Industrial IoT Sensor Node Power Management |
|
Use Scenario: Per-board current supervision in 48-V distributed power architecture for 5G base station line cards. IC Role / Device Role / Timing Role: INA2191A3IYBJR channels monitor primary 48-V input and secondary 12-V/3.3-V DC-DC outputs, with ENABLE pins tied to supervisor IC fault signals. Use Value: –0.2 V to +40 V common-mode range covers full 48-V rail with margin; 7 ppm/°C gain drift ensures stable calibration over chassis temperature gradients. |
Use Scenario: Low-power current profiling of LoRaWAN sensor nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Single INA2191A3IYBJR channel measures MCU + RF transceiver current bursts; second channel monitors sleep-mode leakage with periodic wake-up sampling. Use Value: 20 nA shutdown current extends 10-year battery life; 1.7-V minimum supply allows operation directly from depleted coin cells without boost converter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA2290AIRGET | Single-channel, 80-V common-mode, 500-kHz bandwidth, I²C output; no REF pin; 1.7-5.5 V supply. | Replaces analog-output designs with digital bus interface; requires MCU I²C support and firmware integration. | Choose when digital output, higher bandwidth, or extended common-mode (>40 V) is required - not for analog feedback loops or REF-based bidirectional sensing. |
| MAX40086ETA+T | Dual-channel, 65-V common-mode, 100 V/V gain, ±50 µV offset, 1.7–5.5 V supply; no REF pins; unidirectional only. | Lacks bidirectional capability and independent channel enable; higher offset limits µA-range resolution. | Choose for cost-sensitive, unidirectional high-voltage monitoring where REF-based offset control and picoamp bias are not needed. |
Compared with INA2290AIRGET and MAX40086ETA+T, the INA2191A3IYBJR uniquely provides dual-channel analog output with per-channel REF and ENABLE pins - enabling true independent bidirectional sensing and ultra-low-power state management in space-constrained, battery-critical designs.
Availability
INA2191A3IYBJR 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 assurance, and traceable sourcing.
Supply support for INA2191A3IYBJR 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 delivering analog and embedded processing solutions, with leadership in precision analog, power management, and signal chain technologies.
The INAx191 product line was designed specifically for ultra-low-power, high-accuracy current sensing in space- and energy-constrained applications - including portable electronics, battery management, and industrial IoT edge nodes.
FAQ
What is the maximum common-mode voltage supported by the INA2191A3IYBJR?
The INA2191A3IYBJR supports a common-mode input voltage range of –0.2 V to +40 V. This allows direct sensing on 36-V battery systems or 48-V telecom rails while operating from a low 1.8-V supply. The specification is guaranteed across –40°C to +125°C and applies independently to both channels of the INA2191A3IYBJR.
How does the REF1 and REF2 pin enable bidirectional current sensing in the INA2191A3IYBJR?
The REF1 and REF2 pins set the output zero-current baseline for channels 1 and 2 respectively. When REFx = VS/2, OUTx = 100 × (IN+ − IN−) + VS/2 - so positive current yields output > VS/2, negative current yields output < VS/2. This enables bidirectional detection with single-supply operation and is a core functional feature of the INA2191A3IYBJR.
What is the quiescent current of the INA2191A3IYBJR when both channels are disabled?
When both ENABLE1 and ENABLE2 are driven low, the INA2191A3IYBJR draws 20–200 nA total quiescent current across the full –40°C to +125°C temperature range. This ultra-low shutdown current is specified for the INA2191 family and makes the INA2191A3IYBJR suitable for multi-year battery-powered applications where background monitoring must be minimized.
Can the INA2191A3IYBJR be used with a 1.7-V supply voltage?
Yes, the INA2191A3IYBJR is fully specified to operate from 1.7 V to 5.5 V. At 1.7 V, it maintains 100 V/V gain, ±12 µV offset, and 35 kHz bandwidth. Output swing is guaranteed to within 23 mV of VS and 50 µV of GND, enabling reliable interfacing with 1.8-V ADCs or comparators - a key capability confirmed for the INA2191A3IYBJR in its datasheet.
What package type and dimensions does the INA2191A3IYBJR use?
The INA2191A3IYBJR uses a 12-ball DSBGA (Die Size Ball Grid Array) package designated YBJ, with nominal body size 1.17 mm × 1.53 mm and 0.4-mm ball pitch. It includes an exposed thermal pad on the bottom for enhanced heat dissipation and achieves 94.1°C/W junction-to-ambient thermal resistance - verified in TI's official package documentation for the INA2191A3IYBJR.
INA2191A3IYBJR 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:
- 35 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
INA2191A3IYBJR FAQ
1.How can I place an order for INA2191A3IYBJR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA2191A3IYBJR 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 INA2191A3IYBJR reliable?
The price and inventory of INA2191A3IYBJR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA2191A3IYBJR is usually 5 days.
3.What payment methods are accepted for INA2191A3IYBJR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA2191A3IYBJR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA2191A3IYBJR?
INA2191A3IYBJR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA2191A3IYBJR 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 INA2191A3IYBJR?
For technical support, including INA2191A3IYBJR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA2191A3IYBJR requirements.
6.How does Aetrix verify that INA2191A3IYBJR is sourced from the original manufacturer or authorized distributors?
All INA2191A3IYBJR 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 INA2191A3IYBJR meets industry standards.
7.What is the process for return or replacement of INA2191A3IYBJR?
All INA2191A3IYBJR units undergo pre-shipment inspection (PSI). If there is an issue with INA2191A3IYBJR, 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 INA2191A3IYBJR part is unused and in its original packaging.
Return procedure for INA2191A3IYBJR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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