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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Current Regulation/Management

Texas Instruments INA302A3IPWR

Name: INA302A3IPWR
Brand: Texas Instruments
SKU: INA302A3IPWR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: INA302A3IPWR

Manufacturer:: Texas Instruments

Category:: Current Regulation/Management

Package:: 14-TSSOP (0.173", 4.40mm Width)

Datasheet:: INA302A3IPWR.pdf

Description:: IC CURRENT SENSE 14TSSOP

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Product details

Overview

INA302A3IPWR from Texas Instruments is a 36-V, precision current-sense amplifier with dual integrated comparators for overcurrent protection. It features 100 V/V gain, ±30 µV max offset voltage, <1 µs comparator 1 response, and operates from 2.7–5.5 V supply in high-side or low-side shunt monitoring of motor drives and power supplies.

For engineers reviewing the INA302A3IPWR datasheet, INA302A3IPWR pinout, INA302A3IPWR application, or INA302A3IPWR equivalent, this device delivers fast, accurate bidirectional current monitoring with independently configurable overlimit alerts and latch modes-critical for real-time fault detection in industrial power systems.

Technical Context

The INA302A3IPWR integrates a zero-drift, 36-V common-mode input amplifier (±0.1 V to +36 V) with two independent comparators: COMP1 triggers within 1 µs on overcurrent, while COMP2 supports adjustable delay (2 µs–10 s) via external CDELAY. Both comparators use internal 80 µA current sources for threshold setting via RLIMIT resistors.

It supports bidirectional sensing via REF pin biasing, enabling negative current detection; open-drain ALERT1/ALERT2 outputs operate with independent latch/transparent mode control via LATCH1/LATCH2 pins, and tolerate pullup voltages up to 6 V independent of VS.

Key Specifications

Parameter	Value and Actual Design Meaning
Gain	100 V/V - enables high-resolution measurement of small shunt voltages (±25 mV full-scale), reducing I²R loss in power paths.
Offset voltage (max)	±30 µV - ensures <0.3% error at 10 mV sense voltage, critical for accuracy with low-value shunts.
Common-mode range	–0.1 V to +36 V - supports direct high-side monitoring of 12 V, 24 V, and 36 V rails without level-shifting.
Comparator 1 response	<1 µs - provides sub-microsecond fault detection for protecting MOSFETs and IGBTs against short-circuit events.
Supply voltage	2.7 V to 5.5 V - compatible with standard 3.3 V or 5 V logic domains while maintaining full 36 V input capability.
Quiescent current	950 µA max - enables integration into always-on protection circuits without excessive standby power draw.
Operating temperature	–40°C to +125°C - qualified for under-hood automotive, industrial motor control, and telecom rectifier applications.

Pinout & Package

The INA302A3IPWR is housed in a 14-pin TSSOP package (4.40 mm × 5.00 mm), optimized for thermal performance (R_θJA = 110.2°C/W) and PCB space efficiency in high-density power modules.

Pin/Terminal	Circuit Role	Design Meaning
1 (VS)	Analog power supply	2.7–5.5 V single supply; powers amplifier core and comparators; bypass capacitor required.
2 (OUT)	Amplifier output	High-precision, rail-to-rail capable analog output referenced to REF; drives ADC or controller inputs directly.
3 (LIMIT1)	Comparator 1 threshold input	Accepts current source (80 µA) to set overcurrent trip point; resistor-connected to GND or VS defines alert threshold.
4 (REF)	Reference bias input	Sets output mid-point for bidirectional sensing; 0 V to VS range enables negative current detection.
5 (GND)	Analog ground	Return path for amplifier, comparators, and internal current sources; must be low-impedance connection to system ground.
6 (LATCH1)	Latch mode control	Digital input selecting transparent (high) or latched (low) behavior for ALERT1 output; no external pull required.
7 (LATCH2)	Latch mode control	Digital input selecting transparent (high) or latched (low) behavior for ALERT2 output; independent of LATCH1.
9 (LIMIT2)	Comparator 2 threshold input	Current-source input (80 µA) for second overcurrent threshold; supports independent trip level from LIMIT1.
10 (DELAY)	Delay timing input	Charges external CDELAY capacitor; sets COMP2 propagation delay from 2 µs to 10 s via RC time constant.
11 (ALERT2)	Open-drain alert output	Active-low, open-drain output for COMP2; requires external pullup; tolerates up to 6 V pullup voltage.
12 (ALERT1)	Open-drain alert output	Active-low, open-drain output for COMP1; responds in <1 µs; shares same electrical specs as ALERT2.
13 (IN–)	Negative shunt terminal	Connects to load side of current-sense resistor; handles –0.1 V to +36 V common-mode voltage.
14 (IN+)	Positive shunt terminal	Connects to supply side of current-sense resistor; completes differential sensing path with IN–.

Key Features

Feature	Design Value
Zero-drift amplifier architecture	Enables ±30 µV max offset and 0.5 µV/°C max drift-ensuring stable accuracy across –40°C to +125°C without calibration.
Dual independent comparators	Supports two distinct overcurrent thresholds (e.g., warning + shutdown) with separate latch controls and delay tuning-eliminating need for external logic.
80 µA internal threshold current sources	Allows precise, resistor-defined trip points (e.g., 37.5 kΩ = 3 V threshold) with minimal component count and no external references.
Bidirectional sensing via REF pin	Permits detection of reverse current flow (e.g., regenerative braking) by biasing OUT around user-defined reference voltage.
Open-drain ALERT outputs with 6 V tolerance	Enables direct interfacing to 3.3 V, 5 V, or 12 V logic domains without level shifters-reducing BOM and layout complexity.

Applications

Motor Overcurrent Protection	Server PSU Current Monitoring
Use Scenario: Real-time phase current monitoring in BLDC motor drivers to prevent winding damage during stall or short-circuit events. IC Role / Device Role / Timing Role: High-side current-sense amplifier with sub-µs alert response detects overcurrent before MOSFET thermal runaway occurs. Use Value: Enables immediate gate shutdown via ALERT1 signal, reducing fault energy dissipation by >90% compared to microcontroller-based polling.	Use Scenario: Continuous load-current verification in 48 V intermediate bus converters for AI server racks. IC Role / Device Role / Timing Role: Precision shunt monitor feeding ADC while simultaneously triggering hardware-level OCP via ALERT2 with programmable delay. Use Value: Prevents false trips during transient inrush by delaying ALERT2 response (e.g., 100 µs), while maintaining immediate response to hard faults via ALERT1.
Industrial PLC Output Protection	Telecom Rectifier Module Monitoring
Use Scenario: Protecting solid-state relay outputs in programmable logic controllers against cable shorts or actuator failures. IC Role / Device Role / Timing Role: Low-side current sensor with latch-enabled ALERT1 holds fault state until PLC firmware acknowledges and resets. Use Value: Eliminates need for external SR latches or interrupt debouncing firmware-reducing code overhead and improving deterministic response.	Use Scenario: Monitoring parallel rectifier diode currents in -48 V telecom power systems to detect imbalance or open-circuit failure. IC Role / Device Role / Timing Role: Bidirectional amplifier with REF biased at 2.5 V detects both forward overcurrent and reverse leakage current. Use Value: Identifies failing rectifiers before thermal runaway by detecting subtle reverse conduction-improving system MTBF by 3×.

Motor Overcurrent Protection

Server PSU Current Monitoring

Use Scenario: Real-time phase current monitoring in BLDC motor drivers to prevent winding damage during stall or short-circuit events.

IC Role / Device Role / Timing Role: High-side current-sense amplifier with sub-µs alert response detects overcurrent before MOSFET thermal runaway occurs.

Use Value: Enables immediate gate shutdown via ALERT1 signal, reducing fault energy dissipation by >90% compared to microcontroller-based polling.

Use Scenario: Continuous load-current verification in 48 V intermediate bus converters for AI server racks.

IC Role / Device Role / Timing Role: Precision shunt monitor feeding ADC while simultaneously triggering hardware-level OCP via ALERT2 with programmable delay.

Use Value: Prevents false trips during transient inrush by delaying ALERT2 response (e.g., 100 µs), while maintaining immediate response to hard faults via ALERT1.

Industrial PLC Output Protection

Telecom Rectifier Module Monitoring

Use Scenario: Protecting solid-state relay outputs in programmable logic controllers against cable shorts or actuator failures.

IC Role / Device Role / Timing Role: Low-side current sensor with latch-enabled ALERT1 holds fault state until PLC firmware acknowledges and resets.

Use Value: Eliminates need for external SR latches or interrupt debouncing firmware-reducing code overhead and improving deterministic response.

Use Scenario: Monitoring parallel rectifier diode currents in -48 V telecom power systems to detect imbalance or open-circuit failure.

IC Role / Device Role / Timing Role: Bidirectional amplifier with REF biased at 2.5 V detects both forward overcurrent and reverse leakage current.

Use Value: Identifies failing rectifiers before thermal runaway by detecting subtle reverse conduction-improving system MTBF by 3×.

Equivalent & Alternatives

The following parts are listed as comparable options for similar overcurrent protection applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
INA303A3IPWR	Window comparator architecture (over + undercurrent detection); identical gain, offset, and package.	Required when bidirectional fault detection (e.g., undervoltage + overvoltage equivalents in current domain) is needed.	Select INA303A3IPWR only if system requires simultaneous high/low limit checking-INA302A3IPWR provides simpler two-overlimit configuration.
MAX40056ATA+T	Single comparator, 200 kHz bandwidth, ±500 µV offset, 2.7–5.5 V supply; no internal current sources for thresholds.	Used where only one fast overcurrent alert is needed and external resistor-divider threshold networks are acceptable.	Choose MAX40056ATA+T for cost-sensitive designs with lower accuracy requirements and no need for dual-alert or delay functionality.

Compared with INA303A3IPWR, the INA302A3IPWR offers dedicated dual overcurrent thresholds instead of window operation-better suited for staged fault responses. Versus MAX40056ATA+T, it integrates precision amplification, dual comparators, and threshold current sources-reducing total solution size by 40% and eliminating 6 external components.

Availability

INA302A3IPWR is available at Aetrix Electronics and suitable for motor control, server power supplies, and industrial PLCs requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for INA302A3IPWR 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 INA30x product line was designed specifically for high-reliability overcurrent protection in industrial, automotive, and computing power systems-integrating current sensing, comparison, and alert generation in a single compact package.

FAQ

What is the maximum common-mode voltage supported by the INA302A3IPWR?

The INA302A3IPWR supports a common-mode input voltage range of –0.1 V to +36 V. This allows direct high-side sensing on 24 V and 36 V industrial buses without external level-shifting circuitry. The specification is guaranteed across the full operating temperature range (–40°C to +125°C) and applies independently of the 2.7–5.5 V supply voltage.

How does the internal 80 µA current source affect threshold setting on LIMIT1 and LIMIT2 pins?

The INA302A3IPWR uses an internal 80 µA current source on both LIMIT1 and LIMIT2 pins. When a resistor R_LIMIT connects the pin to GND, the resulting voltage drop (V_TH = 80 µA × R_LIMIT) sets the comparator trip point. For example, a 37.5 kΩ resistor yields a 3.0 V threshold. This eliminates dependency on external references and improves temperature stability versus resistor-divider networks.

Can the INA302A3IPWR detect reverse current flow?

Yes-the INA302A3IPWR supports bidirectional current sensing via the REF pin. By applying a DC bias (e.g., 2.5 V) to REF, the OUT pin swings above or below that voltage depending on current direction. While the INA302A3IPWR's comparators are configured for overcurrent only, reverse current magnitude can still be measured and monitored using the analog output.

What is the purpose of the DELAY pin and how is the ALERT2 response time calculated?

Pin 10 (DELAY) charges an external capacitor (C_DELAY) to set the propagation delay for ALERT2. The delay time is calculated as t_DELAY ≈ C_DELAY × V_TH / I_D, where V_TH = 1.22 V and I_D = 5 µA. A 100 pF capacitor yields ~24.4 µs delay. This allows intentional blanking during inrush transients while preserving fast response to sustained overcurrents.

Is the INA302A3IPWR pin-compatible with other variants in the INA30x family?

Yes-the INA302A3IPWR shares identical pinout and package (14-pin TSSOP) with all INA30x devices including INA302A1/A2, INA303A1/A2/A3, and all temperature-grade versions. Gain and comparator configuration differ internally, but PCB layout, decoupling, and interconnect remain fully interchangeable across the family.

INA302A3IPWR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 14-TSSOP (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Current Sense

Sensing Method:: High/Low-Side

Accuracy:: -

Voltage - Input:: 0V ~ 36V

Current - Output:: -

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 14-TSSOP

INA302A3IPWR FAQ

1.How can I place an order for INA302A3IPWR through Aetrix?

Please submit a Request for Quotation (RFQ) for INA302A3IPWR 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 INA302A3IPWR reliable?

The price and inventory of INA302A3IPWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA302A3IPWR is usually 5 days.

3.What payment methods are accepted for INA302A3IPWR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA302A3IPWR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for INA302A3IPWR?

INA302A3IPWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your INA302A3IPWR 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 INA302A3IPWR?

For technical support, including INA302A3IPWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA302A3IPWR requirements.

6.How does Aetrix verify that INA302A3IPWR is sourced from the original manufacturer or authorized distributors?

All INA302A3IPWR 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 INA302A3IPWR meets industry standards.

7.What is the process for return or replacement of INA302A3IPWR?

All INA302A3IPWR units undergo pre-shipment inspection (PSI). If there is an issue with INA302A3IPWR, 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 INA302A3IPWR part is unused and in its original packaging.

Return procedure for INA302A3IPWR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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