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Texas Instruments INA301A1IDGKR
- Part No.:
- INA301A1IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA301A1IDGKR.pdf
- Description:
- IC CURRENT MONITOR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,952
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Product details
Overview
INA301A1IDGKR from Texas Instruments is a 36-V common-mode, zero-drift current-shunt monitor IC with dual voltage-output amplifier (gain = 20 V/V) and high-speed overcurrent comparator. It delivers ±35 µV max offset voltage, 1 µs total alert response time, and operates from 2.7 V to 5.5 V supply while measuring shunt voltages across 0 V to 36 V common-mode rails - used in server power-rail monitoring and battery protection circuits.
For engineers reviewing the INA301A1IDGKR datasheet, INA301A1IDGKR pinout, INA301A1IDGKR application, or INA301A1IDGKR equivalent, this page provides verified functional specifications, VSSOP-8 package layout, latched/transparent alert mode behavior, gain- and threshold-setting design meaning, and validated alternative parts for overcurrent detection systems requiring sub-1 µs fault response and <0.1% gain error.
Technical Context
The INA301A1IDGKR integrates a precision zero-drift instrumentation amplifier and a dedicated high-speed comparator on a single die. Its amplifier uses auto-zeroing architecture to maintain 0.5 µV/°C max offset drift over –40°C to +125°C, enabling accurate low-value shunt measurements without calibration. The comparator features an internal 80 µA current source at the LIMIT pin, allowing resistor-programmed threshold setting with 20 mV hysteresis.
It supports both high-side and low-side current sensing configurations. The open-drain ALERT output operates in transparent mode (RESET = low) or latched mode (RESET = high), with reset pulse width requirement of ≥100 ns. Total propagation delay remains ≤1 µs across full temperature range and supply voltage (2.7 V–5.5 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V - sets 200 mV input differential to 4 V output, enabling precise trip-point alignment with standard 3.3 V/5 V logic thresholds. |
| Offset Voltage (max) | ±35 µV - allows use of 1 mΩ shunt at 10 A without >0.35 mV measurement error, reducing I²R loss and thermal drift impact. |
| Common-Mode Range | 0 V to 36 V - supports direct sensing on 12 V, 24 V, and 36 V industrial power rails without level-shifting circuitry. |
| Alert Response Time | 1 µs - enables detection and shutdown before MOSFET SOA violation in DC-DC converter overcurrent events. |
| Supply Voltage | 2.7 V to 5.5 V - compatible with 3.3 V microcontroller GPIOs and LDO outputs; draws only 700 µA max quiescent current. |
| Hysteresis | 20 mV - prevents false triggering near threshold due to noise or slow signal edges in high-noise motor drive environments. |
| Bandwidth | 550 kHz - supports fast transient current monitoring in switching power supplies up to ~100 kHz switching frequency. |
Pinout & Package
VSSOP-8 package (3.00 mm × 3.00 mm body size), thermally enhanced for high-reliability industrial operation; pin-compatible with other INA301 variants (A2/A3) in same footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS | Analog power supply input | Accepts 2.7 V–5.5 V; powers both amplifier and comparator; must be bypassed with 0.1 µF capacitor to GND. |
| OUT | Analog voltage output | Amplified shunt voltage (×20); rail-to-rail swing (VS – 0.1 V min) drives ADC or external comparator. |
| LIMIT | Comparator threshold reference input | Internal 80 µA current source sets trip point via external RLIMIT; 20 mV hysteresis improves noise immunity. |
| GND | Analog ground reference | Return path for VS, OUT, and internal circuitry; requires low-impedance connection to system power ground plane. |
| RESET | Digital mode control input | High = latch mode (ALERT stays low until RESET pulsed low); low = transparent mode (ALERT follows input state). |
| ALERT | Open-drain digital output | Active-low overcurrent flag; requires external 10 kΩ pull-up to VS or higher (≤5.5 V); sinks ≥3 mA. |
| IN– | Differential analog input (negative) | Connects to load side of shunt; common-mode voltage up to 36 V tolerated even when VS = 0 V. |
| IN+ | Differential analog input (positive) | Connects to supply side of shunt; CMRR ≥100 dB ensures accuracy despite 36 V rail noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Zero-drift amplifier topology | Enables stable 35 µV max offset over –40°C to +125°C, eliminating need for periodic system recalibration in telecom base stations. |
| Single-resistor programmable limit | RLIMIT sets trip point without DAC or op-amp circuitry - e.g., 50 kΩ yields 4 V threshold for 20 A × 10 mΩ × 20 V/V configuration. |
| Configurable alert latching | RESET pin selects between real-time interrupt signaling (transparent) or fault capture for polled microcontrollers (latch). |
| 36 V common-mode tolerance | Allows direct placement on 24 V/36 V battery inputs or PoE++ power feeds without isolation or attenuation networks. |
| Sub-1 µs comparator response | Guarantees detection of <100 ns current spikes in motor phase-leg short-circuit scenarios before device destruction. |
Applications
| Server Power-Rail Monitoring | Battery Management Systems |
|---|---|
|
Use Scenario: Real-time current monitoring on 12 V VRM output rails in cloud data center servers. IC Role / Device Role / Timing Role: High-side shunt monitor providing amplified output to ADC and immediate ALERT assertion on overcurrent. Use Value: Enables firmware-controlled power capping and graceful shutdown within 1 µs of fault onset, preventing CPU damage. |
Use Scenario: Cell-level current supervision in 48 V Li-ion battery packs for EV charging infrastructure. IC Role / Device Role / Timing Role: Dual-function sensor delivering analog feedback to BMS MCU and hardwired fault signal to safety controller. Use Value: Supports ASIL-B compliant overcurrent protection with independent analog and digital paths - no single-point failure. |
| Industrial Motor Drives | Telecom Rectifier Modules |
|
Use Scenario: Phase current sensing in 24 V BLDC motor inverters with regenerative braking transients. IC Role / Device Role / Timing Role: Low-drift amplifier captures bidirectional current; comparator triggers gate driver disable on >150% overload. Use Value: 20 mV hysteresis prevents chatter during PWM edge noise; 550 kHz bandwidth resolves 100 kHz switching artifacts. |
Use Scenario: Output current limiting in -48 V telecom rectifiers with hot-swap capability. IC Role / Device Role / Timing Role: High-side monitor on secondary side; ALERT drives OR-ing FET control and upstream SCU reporting. Use Value: 0 V to 36 V common-mode range accommodates full -48 V output swing referenced to chassis ground without level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-shunt monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1DGNR | Higher bandwidth (1.1 MHz), lower offset (±5 µV), but fixed 20 V/V gain and no integrated comparator. | Requires external comparator for alert generation; better for precision ADC-based monitoring than autonomous fault shutdown. | Select when system already includes fast comparator or needs tighter offset spec; not drop-in for ALERT-driven protection. |
| MAX40056ATA+T | Wider supply range (2.7 V–60 V), faster response (350 ns), but 500 µV offset and no zero-drift architecture. | Suitable for ultra-fast 48 V telecom surge detection where drift is less critical than speed; lacks long-term stability at 125°C. | Choose for <400 ns response in high-voltage transient suppression; avoid where 0.5 µV/°C drift matters over temperature cycling. |
Compared with INA301A1IDGKR, INA240A1DGNR offers superior DC precision but requires external fault logic, while MAX40056ATA+T delivers faster response at the cost of offset stability - making INA301A1IDGKR optimal for embedded systems needing integrated, temperature-stable overcurrent protection with minimal BOM count.
Availability
INA301A1IDGKR is available at Aetrix Electronics and suitable for server power-rail monitoring, battery management systems, industrial motor drives, and telecom rectifier modules requiring stable component supply across extended temperature and high-reliability production cycles.
Supply support for INA301A1IDGKR 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 INA301 product line targets high-accuracy, high-speed current sensing in safety-critical power systems - designed specifically for overcurrent protection, power-supply monitoring, and battery protection where fast, reliable fault detection is mandatory.
FAQ
What is the maximum common-mode voltage the INA301A1IDGKR can measure?
The INA301A1IDGKR supports a common-mode input voltage range of 0 V to 36 V, independent of its 2.7 V to 5.5 V supply voltage. This allows direct high-side sensing on 24 V and 36 V industrial rails. The device withstands full 36 V at IN+ and IN– even with VS = 0 V, ensuring robustness during supply sequencing or brownout conditions - a key capability confirmed in INA301A1IDGKR absolute maximum ratings and functional description sections.
How does the RESET pin configure alert behavior in the INA301A1IDGKR?
The RESET pin on the INA301A1IDGKR selects between two alert modes: when pulled low, it enables transparent mode (ALERT follows input state in real time); when pulled high, it enables latched mode (ALERT stays asserted until RESET is pulsed low for ≥100 ns). This dual-mode flexibility lets designers choose between microcontroller interrupt-driven response or polled fault capture - a feature explicitly defined in the INA301A1IDGKR datasheet's "Alert Mode" section and verified in typical application waveforms.
What external components are required to set the overcurrent threshold for the INA301A1IDGKR?
The INA301A1IDGKR requires only one external resistor (RLIMIT) connected from the LIMIT pin to GND to set the overcurrent threshold. An internal 80 µA current source develops VLIMIT = 80 µA × RLIMIT, which the comparator compares against the 20× amplified shunt voltage. For example, a 50 kΩ resistor sets a 4 V threshold - matching 20 A through a 10 mΩ shunt. This resistor-only method is documented in INA301A1IDGKR's "Setting The Current-Limit Threshold" section and eliminates need for DACs or op-amps.
Can the INA301A1IDGKR operate with a 3.3 V supply and still interface with 5 V logic?
Yes - the INA301A1IDGKR operates from 2.7 V to 5.5 V, and its open-drain ALERT output can be pulled up to any voltage ≤5.5 V, including 5 V logic rails. Its RESET and LIMIT pins tolerate voltages up to (VS + 0.3 V), and the ALERT sink capability (≥3 mA at 300 mV VOL) ensures clean interfacing with 5 V microcontrollers or FPGA inputs. This interoperability is specified in INA301A1IDGKR's absolute maximum and recommended operating conditions tables.
What is the guaranteed alert response time for the INA301A1IDGKR across temperature and supply variations?
The INA301A1IDGKR guarantees total alert propagation delay ≤1 µs across its full operating range (–40°C to +125°C, VS = 2.7 V to 5.5 V), with typical performance of 0.75 µs at 25°C. This specification includes amplifier settling, comparator decision, and output driver delay - confirmed in the "Electrical Characteristics" table under tp parameter and validated in Figure 29 (Total Propagation Delay) of the INA301A1IDGKR datasheet.
INA301A1IDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Current Monitor
- 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:
- 8-VSSOP
INA301A1IDGKR FAQ
1.How can I place an order for INA301A1IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA301A1IDGKR 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 INA301A1IDGKR reliable?
The price and inventory of INA301A1IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA301A1IDGKR is usually 5 days.
3.What payment methods are accepted for INA301A1IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA301A1IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA301A1IDGKR?
INA301A1IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA301A1IDGKR 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 INA301A1IDGKR?
For technical support, including INA301A1IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA301A1IDGKR requirements.
6.How does Aetrix verify that INA301A1IDGKR is sourced from the original manufacturer or authorized distributors?
All INA301A1IDGKR 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 INA301A1IDGKR meets industry standards.
7.What is the process for return or replacement of INA301A1IDGKR?
All INA301A1IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA301A1IDGKR, 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 INA301A1IDGKR part is unused and in its original packaging.
Return procedure for INA301A1IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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