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Texas Instruments INA310A3IDGKR
- Part No.:
- INA310A3IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA310A3IDGKR.pdf
- Description:
- -4-V TO 110-V, 1.3-MHZ, ULTRA-PR
- Quantity:
- Payment:
- Shipping:
Inventory:11,192
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Product details
Overview
INA310A3IDGKR from Texas Instruments is an ultra-precise, high-speed current sense amplifier with integrated open-drain comparator and 0.6 V internal reference, designed for high-side or low-side shunt monitoring in 48 V systems. It delivers 100 V/V fixed gain, ±10 µV max offset voltage (25°C), 160 dB CMRR, and operates across –4 V to +110 V common-mode range with 1.3 MHz bandwidth - enabling fast overcurrent protection in DC/DC converters and battery management.
For engineers reviewing the INA310A3IDGKR datasheet, INA310A3IDGKR pinout, INA310A3IDGKR application, or INA310A3IDGKR equivalent, this page provides verified technical context, validated pin functions, confirmed performance parameters at temperature extremes, and real-world implementation guidance for 48 V power systems requiring sub-1 µs fault response.
Technical Context
The INA310A3IDGKR employs a zero-drift topology with precision internal resistor network to achieve 0.15% max gain error and ±0.25 µV/°C offset drift over –40°C to +125°C. Its input stage supports common-mode voltages independent of supply (2.7 V–20 V), enabling direct connection to 48 V bus nodes without level-shifting.
The integrated comparator features 1 µs propagation delay, 8 mV hysteresis, and latching mode controlled by the RESET pin - allowing transparent or persistent fault signaling. CMPIN accepts 0–5.5 V inputs via external resistive divider, while CMPOUT drives open-drain up to 20 V with 300 mV VOL at 2.35 mA sink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100 V/V - fixed internal ratio optimized for 40 mV full-scale shunt sensing at 1.3 MHz bandwidth |
| Offset Voltage (max) | ±10 µV at 25°C - enables accurate measurement of ≤100 µV sense voltage drops across low-ohmic shunts |
| CMRR | 160 dB - rejects >99.9999% of common-mode noise from 48 V rail transients in BMS and PSU applications |
| Bandwidth | 1.0 MHz - supports detection of fast overcurrent events with <10 µs settling time (0.1% error) |
| Supply Range | 2.7 V to 20 V - powers from auxiliary rails while sensing across –4 V to +110 V common-mode |
| Comparator Threshold | 0.6 V ±20 mV - stable trip point referenced internally, eliminating need for external precision reference |
| Quiescent Current | 1.6 mA - enables always-on monitoring in energy-sensitive 48 V rack servers and RRUs |
Pinout & Package
INA310A3IDGKR is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm body size) with exposed thermal pad for enhanced power dissipation in high-current monitoring applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS (Pin 1) | Power supply input | Accepts 2.7 V–20 V; powers analog core and comparator independently of sensed rail |
| IN+ (Pin 2) | Positive shunt sense input | Connects to high-side bus or low-side load; Kelvin routing critical for <0.1% gain error |
| IN– (Pin 3) | Negative shunt sense input | Connects to low-side ground or high-side load; matched trace length required with IN+ |
| GND (Pin 4) | Analog ground reference | Must tie to system power ground near shunt; separate from digital ground to avoid noise coupling |
| RESET (Pin 5) | Comparator latch control | Low = transparent mode; high = latched fault; open = default transparent operation |
| CMPOUT (Pin 6) | Open-drain comparator output | Sinks up to 2.35 mA; requires external pull-up to 0–20 V rail for flexible logic interfacing |
| CMPIN (Pin 7) | Comparator input | Accepts divided VOUT (0–5.5 V); 20 nA bias current at threshold ensures <0.5% trip-point error |
| OUT (Pin 8) | Amplified current-sense output | Drives 10 kΩ load with rail-to-rail swing; used for ADC input or as CMPIN source via resistor divider |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low offset drift | ±0.25 µV/°C - maintains calibration stability across –40°C to +125°C in server PSUs and outdoor BMS |
| High CMRR at frequency | 85 dB at 50 kHz - suppresses switching noise from 100 kHz–1 MHz DC/DC converters |
| Integrated comparator hysteresis | 8 mV - prevents chatter during noisy overcurrent transitions in solenoid drive circuits |
| Input bias current flatness | 20 µA up to +110 V CM - eliminates gain error shift when monitoring negative transients (–4 V) |
| Latching fault signaling | Hardware-set persistent alert - reduces MCU polling overhead in macro RRU baseband units |
Applications
| 48 V Battery Management System | 48 V Rack Server PSU |
|---|---|
Use Scenario: Real-time cell-string current monitoring during charge/discharge cycles in telecom and datacenter battery racks. IC Role / Device Role / Timing Role: High-side current sense amplifier with comparator-triggered isolation MOSFET shutdown. Use Value: 1 µs fault response enables sub-100 ns overcurrent cutoff before fuse activation, preserving module integrity. |
Use Scenario: Input/output current supervision in multi-phase 48 V–12 V DC/DC converters powering CPU/GPU rails. IC Role / Device Role / Timing Role: Low-side shunt monitor feeding ADC and latched comparator for phase-fail detection. Use Value: 160 dB CMRR rejects PWM noise from adjacent phases, ensuring ±0.5% current accuracy at 100 A. |
| Macro Remote Radio Unit | Solenoid & Actuator Driver |
Use Scenario: Monitoring PA module supply current in outdoor 5G RRU cabinets operating from -40°C to +85°C ambient. IC Role / Device Role / Timing Role: High-side sense amplifier with transparent comparator driving FPGA interrupt on overcurrent. Use Value: ±10 µV offset and 0.25 µV/°C drift ensure <1% full-scale error across full temperature range without recalibration. |
Use Scenario: Closed-loop current control and stall detection in industrial hydraulic solenoids powered from 48 V supplies. IC Role / Device Role / Timing Role: Low-side shunt amplifier feeding microcontroller ADC and comparator for instantaneous stall lockout. Use Value: 1.3 MHz bandwidth captures 10 µs rise-time solenoid turn-on transients, enabling precise dwell-time control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current sense amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A3DGNR | 100 V/V gain, 4 V to 80 V CM range, no integrated comparator, 120 dB CMRR | Lacks hardware latching; requires external comparator for fault persistence | Select when comparator functionality is implemented digitally or when cost sensitivity outweighs fault-response speed |
| MAX40056ATA+T | 100 V/V gain, –0.2 V to 65 V CM range, 1.5 MHz BW, 0.6 V reference, but no RESET latch control | Supports lower supply (2.7 V–5.5 V) only; no latching mode - limits use in safety-critical shutdown paths | Prefer for space-constrained designs needing higher bandwidth where latch-free comparator behavior is acceptable |
Compared with INA240A3DGNR and MAX40056ATA+T, the INA310A3IDGKR uniquely combines 110 V common-mode capability, integrated latching comparator, and ±10 µV offset in a single VSSOP-8 package - making it the only option for compact, self-contained overcurrent protection in 48 V high-reliability systems.
Availability
INA310A3IDGKR is available at Aetrix Electronics and suitable for 48 V battery management systems, rack server power supplies, and macro remote radio unit designs requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for INA310A3IDGKR 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 over 50 years of precision amplifier innovation and automotive-grade reliability validation.
The INA310x product line was engineered specifically for high-voltage, high-speed current sensing in next-generation 48 V power architectures - emphasizing ultra-low drift, integrated fault signaling, and robust operation across extended temperature and common-mode ranges.
FAQ
What is the maximum common-mode voltage the INA310A3IDGKR can withstand during normal operation?
The INA310A3IDGKR supports a continuous operational common-mode input range of –4 V to +110 V, independent of its 2.7 V–20 V supply voltage. This allows direct high-side sensing on 48 V buses with margin for transient spikes. Its survival rating extends to –20 V to +120 V, verified per absolute maximum ratings in the SBOSA86 datasheet.
How does the RESET pin affect comparator behavior in the INA310A3IDGKR?
In the INA310A3IDGKR, the RESET pin configures comparator mode: grounded or open = transparent mode (output follows input continuously); pulled high = latching mode (output stays high after trip until RESET is pulsed low). This hardware latch eliminates software polling in safety-critical 48 V BMS and RRU applications.
What is the typical propagation delay from overcurrent event to CMPOUT assertion in the INA310A3IDGKR?
The INA310A3IDGKR achieves a total propagation delay of 1 µs from sense voltage exceeding the trip threshold to CMPOUT going high. This includes amplifier response, external resistor-divider settling, and comparator decision time - verified under small-signal overdrive conditions per Section 6.5 of the SBOSA86 datasheet.
Can the INA310A3IDGKR be used for low-side current sensing, and what layout considerations apply?
Yes, the INA310A3IDGKR supports both high-side and low-side configurations. For low-side use, connect IN+ to the load side and IN– to ground. Critical layout requirements include Kelvin routing of shunt connections, separation of analog and digital grounds, and placement of 0.1 µF bypass capacitor within 2 mm of VS and GND pins to maintain 160 dB CMRR.
What is the output voltage swing capability of the INA310A3IDGKR at 125°C and 5 V supply?
At TA = +125°C and VS = 5 V, the INA310A3IDGKR delivers a minimum output swing of (VS – 150) mV = 4.85 V high and (GND + 20) mV = 20 mV low into a 10 kΩ load. This rail-to-rail performance ensures compatibility with 5 V ADC references and comparator input thresholds across full industrial temperature range.
INA310A3IDGKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Zero-Drift
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- Single-Ended
- Slew Rate:
- 2.5V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1 MHz
- Current - Input Bias:
- 20 µA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 1.6mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 20 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
INA310A3IDGKR FAQ
1.How can I place an order for INA310A3IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for INA310A3IDGKR 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 INA310A3IDGKR reliable?
The price and inventory of INA310A3IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA310A3IDGKR is usually 5 days.
3.What payment methods are accepted for INA310A3IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA310A3IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA310A3IDGKR?
INA310A3IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA310A3IDGKR 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 INA310A3IDGKR?
For technical support, including INA310A3IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA310A3IDGKR requirements.
6.How does Aetrix verify that INA310A3IDGKR is sourced from the original manufacturer or authorized distributors?
All INA310A3IDGKR 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 INA310A3IDGKR meets industry standards.
7.What is the process for return or replacement of INA310A3IDGKR?
All INA310A3IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with INA310A3IDGKR, 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 INA310A3IDGKR part is unused and in its original packaging.
Return procedure for INA310A3IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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