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Texas Instruments INA4181A4IPWR
- Part No.:
- INA4181A4IPWR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
INA4181A4IPWR.pdf
- Description:
- IC CURR SENSE 4 CIRCUIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:353
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Product details
Overview
INA4181A4IPWR from Texas Instruments is a quad-channel, bidirectional current-sense amplifier with 200 V/V fixed gain, –0.2 V to +26 V input common-mode range, ±500 µV max offset at 12 V VCM, and 105 kHz small-signal bandwidth. It enables precision high- and low-side current monitoring in motor control, battery management, and solar inverter power stages.
For engineers reviewing the INA4181A4IPWR datasheet, INA4181A4IPWR pinout, INA4181A4IPWR application, or INA4181A4IPWR equivalent, key selection criteria include its quad-channel TSSOP-20 layout, rail-to-rail output swing (≤5 mV above GND), 900 µA max quiescent current, and guaranteed ±1% gain error across –40°C to +125°C.
Technical Context
The INA4181A4IPWR integrates four matched-resistor gain networks (200 V/V each) to minimize inter-channel gain mismatch and temperature drift. Its proprietary topology decouples input common-mode voltage (up to 26 V) from supply voltage (2.7–5.5 V), enabling direct sensing on high-voltage buses without level-shifting.
Each channel features independent REF pins for bidirectional operation, differential inputs with 100 dB CMRR, and 2 V/µs slew rate. The device supports simultaneous high-side and low-side configurations per channel, with input bias current under 75 µA and 40 nV/√Hz input-referred noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 200 V/V - Enables accurate measurement of sub-10 mV sense resistor drops (e.g., 5 mΩ @ 10 A = 50 mV → 10 V output) |
| Common-mode range | –0.2 V to +26 V - Supports direct connection to 24-V bus rails and negative transient detection without external circuitry |
| Offset voltage | ±500 µV max at 12 V VCM - Limits current measurement error to ≤0.25% at full-scale 100 mV sense voltage |
| Bandwidth | 105 kHz - Captures fast current transients in PWM-driven motor phases and inverter switching events |
| Quiescent current | 900 µA max - Allows continuous monitoring in battery-powered systems with minimal standby power penalty |
| Output swing | Within 5 mV of GND and 30 mV of VS - Maximizes dynamic range for ADC interfacing with 12-bit or higher resolution |
| Operating temperature | –40°C to +125°C - Qualified for under-hood automotive, industrial motor drives, and outdoor solar equipment |
Pinout & Package
INA4181A4IPWR is housed in a 20-pin TSSOP (PW) package measuring 6.50 mm × 6.40 mm, with exposed thermal pad recommended for grounding to improve thermal performance (RθJA = 97.0°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+1 to IN+4 | Current-sense amplifier positive input (per channel) | Connect to bus-voltage side of sense resistor in high-side config; to load side in low-side config |
| IN–1 to IN–4 | Current-sense amplifier negative input (per channel) | Connect to load side of sense resistor in high-side config; to ground side in low-side config |
| OUT1 to OUT4 | Analog output voltage (per channel) | Provides amplified, referenced output: VOUT = GAIN × (VIN+ – VIN–) + VREF |
| REF1 to REF4 | Reference voltage input (per channel) | Sets zero-current output level; 0 V enables unidirectional sensing; mid-supply enables bidirectional |
| VS | Power supply | 2.7–5.5 V analog supply; powers all four channels; bypass with 0.1 µF ceramic capacitor |
| GND | Analog ground | Return path for all analog signals; connect to PCB ground plane beneath thermal pad |
| NC (Pins 10, 11) | No internal connection | May be left floating or tied to GND; no electrical function or thermal benefit |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional sensing per channel | Independent REF pins enable true bidirectional current measurement without external op-amps or level shifters |
| Matched 200 V/V gain network | Integrated laser-trimmed resistors ensure <0.5% inter-channel gain mismatch and <20 ppm/°C drift |
| Rail-to-rail output stage | Output swings within 5 mV of GND and 30 mV of VS, preserving >98% of 0–5 V ADC input range |
| High CMRR (100 dB typical) | Maintains accuracy despite 26-V common-mode transients-critical for noisy motor drive and inverter environments |
| Low 1-µV/°C offset drift | Ensures stable zero-current baseline over temperature, reducing calibration frequency in industrial systems |
Applications
| Motor Phase Current Monitoring | Battery Cell Balancing |
|---|---|
|
Use Scenario: Real-time monitoring of individual phase currents in 3-phase BLDC motor drives using shunt resistors on low-side FETs. IC Role / Device Role / Timing Role: Quad-channel current-sense amplifier providing synchronized, isolated current feedback for field-oriented control (FOC) algorithms. Use Value: 105 kHz bandwidth captures PWM ripple; ±500 µV offset ensures <0.5% error at 1-A stall current with 10-mΩ shunt. |
Use Scenario: Measuring charge/discharge current across individual Li-ion cells in 12S BMS stacks with 24-V nominal bus. IC Role / Device Role / Timing Role: Four independent current monitors interfaced to MCU ADC, each handling one cell pair in active balancing circuits. Use Value: –0.2 V to +26 V common-mode range allows direct sensing on high-side of cell strings without isolation; 900 µA IQ extends battery runtime. |
| Solar Inverter DC Link Monitoring | Industrial PLC Output Module Protection |
|
Use Scenario: High-side current sensing on DC link between PV array and MPPT converter in string inverters operating up to 1000 VDC. IC Role / Device Role / Timing Role: Isolated current monitor front-end (with external isolator) measuring bidirectional energy flow during reactive power control. Use Value: 200 V/V gain resolves 10 mA changes across 50-mΩ shunt; 100 dB CMRR rejects common-mode noise from IGBT switching. |
Use Scenario: Overcurrent protection for 4-channel 24-VDC solid-state relay outputs in programmable logic controllers. IC Role / Device Role / Timing Role: Quad-channel current limiter feeding comparators that trigger shutdown within 1 µs of fault detection. Use Value: 2 V/µs slew rate enables sub-microsecond response to short-circuit events; independent REF pins allow programmable trip thresholds per channel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA4181A3IPWR | 100 V/V gain (vs. 200 V/V); same package, bandwidth (150 kHz), and offset specs | Better suited for higher sense voltage ranges (>100 mV) where 200× gain causes output saturation | Select when full-scale sense voltage exceeds 25 mV to retain headroom and avoid clipping |
| INA2181A4IPW | Dual-channel version; identical 200 V/V gain, 105 kHz BW, and 26-V VCM-but only two channels in 10-pin VSSOP | Lower channel density reduces PCB area but requires two devices for quad functionality | Choose for space-constrained dual-monitoring tasks or when channel count flexibility is needed |
Compared with INA4181A3IPWR and INA2181A4IPW, the INA4181A4IPWR delivers highest gain per channel in a single quad-package solution, minimizing board area and inter-channel timing skew-critical for synchronous multi-phase current control.
Availability
INA4181A4IPWR is available at Aetrix Electronics and suitable for motor control, battery management, and solar inverter applications requiring stable component supply, extended temperature qualification, and production-ready traceability.
Supply support for INA4181A4IPWR 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 delivering analog and embedded processing solutions with deep expertise in precision signal chain design.
The INA4181A4IPWR belongs to TI's INAx181 family of cost-optimized, quad-channel current-sense amplifiers engineered for high-accuracy bidirectional current monitoring in industrial and automotive power systems.
FAQ
What is the maximum common-mode voltage the INA4181A4IPWR can handle?
The INA4181A4IPWR supports an input common-mode voltage range from –0.2 V to +26 V, independent of its 2.7–5.5 V supply voltage. This allows direct sensing on 24-V bus rails and tolerance of negative transients, making it suitable for high-side configurations in motor drives and power supplies where the INA4181A4IPWR interfaces directly with the load side of the sense resistor.
Does the INA4181A4IPWR require external components for basic operation?
Yes-the INA4181A4IPWR requires a 0.1 µF ceramic bypass capacitor between VS and GND, plus external current-sense resistors and reference voltages applied to each REF pin. No external gain-setting resistors are needed, as the 200 V/V ratio is internally fixed and laser-trimmed. The INA4181A4IPWR operates fully functional with these minimal components, eliminating calibration overhead.
How does the INA4181A4IPWR support bidirectional current sensing?
The INA4181A4IPWR enables bidirectional sensing by applying a defined reference voltage (e.g., VS/2) to each REF pin. A positive differential input (IN+ > IN–) produces VOUT > VREF; a negative differential input produces VOUT < VREF. This architecture lets the INA4181A4IPWR resolve both charging and discharging currents in battery systems without polarity-switching circuitry.
What is the thermal performance of the INA4181A4IPWR in its TSSOP-20 package?
The INA4181A4IPWR in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (RθJA) of 97.0°C/W under standard JEDEC conditions. With its exposed thermal pad, grounding the pad to a large copper area reduces effective RθJA significantly-enabling reliable operation at full 900 µA quiescent current across –40°C to +125°C ambient, as specified for the INA4181A4IPWR.
Can the INA4181A4IPWR replace older current-sense amplifiers like the INA138 or MAX4080?
The INA4181A4IPWR is not a drop-in replacement for the INA138 (single-channel, unidirectional) or MAX4080 (dual-channel, 500-kHz BW), due to differences in channel count, gain options, and pinout. However, for new quad-channel, 200× gain, bidirectional designs requiring 26-V VCM and low offset, the INA4181A4IPWR offers superior integration and temperature stability compared to discrete alternatives.
INA4181A4IPWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 105 kHz
- Current - Input Bias:
- 75 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 690µA
- 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:
- 20-TSSOP
INA4181A4IPWR FAQ
1.How can I place an order for INA4181A4IPWR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA4181A4IPWR 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 INA4181A4IPWR reliable?
The price and inventory of INA4181A4IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA4181A4IPWR is usually 5 days.
3.What payment methods are accepted for INA4181A4IPWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA4181A4IPWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA4181A4IPWR?
INA4181A4IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA4181A4IPWR 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 INA4181A4IPWR?
For technical support, including INA4181A4IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA4181A4IPWR requirements.
6.How does Aetrix verify that INA4181A4IPWR is sourced from the original manufacturer or authorized distributors?
All INA4181A4IPWR 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 INA4181A4IPWR meets industry standards.
7.What is the process for return or replacement of INA4181A4IPWR?
All INA4181A4IPWR units undergo pre-shipment inspection (PSI). If there is an issue with INA4181A4IPWR, 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 INA4181A4IPWR part is unused and in its original packaging.
Return procedure for INA4181A4IPWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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