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Texas Instruments INA203AIDGST
- Part No.:
- INA203AIDGST
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
INA203AIDGST.pdf
- Description:
- IC CURRENT MONITOR 3.5% 10VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:497
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Product details
Overview
INA203AIDGST from Texas Instruments is a unidirectional current-shunt monitor IC with 20 V/V gain, dual open-drain comparators (CMP1 latched, CMP2 delay-programmable), and integrated 1.2-V reference output. It operates from 2.7 V to 18 V, supports –16 V to 80 V common-mode input range, and delivers 500-kHz bandwidth for real-time shunt current sensing in high-side power rails. It is used in telecom power supplies to detect overcurrent faults before MOSFET failure.
For engineers reviewing the INA203AIDGST datasheet, INA203AIDGST pinout, INA203AIDGST application, or INA203AIDGST equivalent, key selection criteria include its 20 V/V fixed gain, latch-enabled comparator 1 for fault hold-off, user-adjustable CMP2 delay via external capacitor, –16 V to 80 V common-mode tolerance, and SOIC-14 package compatibility with industrial PCB layouts.
Technical Context
The INA203AIDGST integrates a precision current-sense amplifier, two independent comparators, and a buffered 1.2-V reference - all on a single die. Its current-sense path features 80 dB minimum CMRR at 25°C and ±2.5 mV max offset voltage over temperature, enabling accurate low-mV shunt measurements across wide supply and common-mode ranges.
Comparator 1 provides latched output with active-low reset (CMP1 RESET), while Comparator 2 offers programmable delay (via external capacitor on CMP2 DELAY pin) and 1.3 μs typical response time. Both comparators use internal 0.6-V references, overrideable on pins 3 and 6 in the 14-pin SOIC package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V - scales 100-mV shunt drop to 2-V output, enabling direct ADC interface without amplification |
| Common-Mode Range | –16 V to 80 V - supports high-side sensing in 48-V telecom systems and negative-rail battery monitoring |
| Bandwidth | 500 kHz - captures fast transient overcurrent events (e.g., short-circuit rise times <2 μs) |
| Quiescent Current | 1.8 mA - enables always-on monitoring in power-constrained embedded systems |
| Reference Output | 1.2 V ±12 mV - stable, buffered reference for comparator thresholds and external circuit biasing |
| Comparator Hysteresis | CMP1: –8 mV, CMP2: +8 mV - prevents chatter during slow-rising fault signals near trip point |
| Operating Temp | –40°C to +125°C - qualified for under-hood automotive and industrial motor drive environments |
Pinout & Package
INA203AIDGST is packaged in a 14-pin SOIC (D package), 8.65 mm × 3.91 mm body size, with exposed pad not present. Pin functions are validated per TI SBOS393E Rev E (November 2015).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Current-sense high-side input | Connects directly to shunt resistor high side; tolerates up to 80 V common-mode |
| VIN− | Current-sense low-side input | Connects to shunt resistor low side; differential input with 100-mV full-scale range |
| OUT | Analog voltage output | 20×(VIN+ − VIN−); rail-to-rail capable with 1.5-Ω output impedance |
| CMP1 IN+ | Comparator 1 non-inverting input | Accepts external threshold; default reference is internal 0.6 V |
| CMP1 IN−/0.6V REF | Comparator 1 inverting input / ref override | Can replace internal 0.6-V reference with external signal for custom trip points |
| CMP2 IN+ | Comparator 2 non-inverting input | Used for overvoltage or overcurrent alarm trigger; referenced to 0.6 V by default |
| CMP2 IN−/0.6V REF | Comparator 2 inverting input / ref override | Enables dual-threshold or window-comparator configurations when externally driven |
| CMP1 RESET | Active-low latch reset | Pulling low clears CMP1 OUT latch; open or grounded enables transparent operation |
| CMP2 DELAY | Capacitor connection for delay timing | 0.1 μF yields 0.5 s delay; linear relationship (tD = 5 × CDELAY) |
| CMP1 OUT | Open-drain latched comparator output | Drives external pull-up; holds state until reset - ideal for fault flag retention |
| CMP2 OUT | Open-drain delayed comparator output | Debounces transients; avoids false triggers from brief current spikes |
| 1.2V REF OUT | Buffered reference output | Supplies stable 1.2 V at ≤1 mA load; usable for ADC reference or bias networks |
| VS | Positive supply input | 2.7 V to 18 V operation; powers all internal blocks including comparators and reference |
| GND | Analog ground reference | Return path for sense inputs, outputs, and internal reference; separate from power ground recommended |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional current sensing | Optimized for high-side shunt placement with –16 V to 80 V common-mode range - eliminates need for level-shifting circuits |
| Latched comparator 1 | Retains fault state after overcurrent event until explicit reset - enables reliable system-level fault logging without continuous polling |
| User-programmable CMP2 delay | External capacitor sets delay from microseconds to seconds - configurable debouncing for noisy power rails |
| Integrated 1.2-V reference | Low-drift (40–100 ppm/°C), buffered output - reduces BOM count by replacing discrete reference ICs |
| High-accuracy current measurement | ±2% total output error over temperature - ensures precise current reporting for closed-loop power management |
Applications
| Telecom Power Supply Monitoring | Automotive Body Control Module |
|---|---|
|
Use Scenario: Real-time monitoring of +48 V DC distribution bus in base station power shelves. IC Role / Device Role / Timing Role: High-side current shunt monitor detecting >15 A overcurrent before MOSFET thermal runaway. Use Value: 500-kHz bandwidth captures sub-2-μs fault rise times; latched CMP1 OUT holds fault flag for microcontroller interrupt servicing. |
Use Scenario: Load current supervision for seat heater and window lift motor drivers in 12 V vehicle systems. IC Role / Device Role / Timing Role: Unidirectional shunt monitor with CMP2 delay preventing nuisance trips from PWM-induced current ripple. Use Value: 0.1 μF on CMP2 DELAY pin sets 500-ms debounce window - rejects 100-Hz switching noise while responding to true overloads. |
| Industrial PLC Output Protection | Lithium-Ion Battery Charger Safety |
|
Use Scenario: Overcurrent detection on 24 V solenoid driver outputs in programmable logic controllers. IC Role / Device Role / Timing Role: Current-sense amplifier feeding CMP1 to trigger immediate shutdown on >3 A fault; CMP1 RESET tied to PLC safety controller. Use Value: –16 V to 80 V common-mode range accommodates floating outputs and reverse-polarity protection diodes without attenuation. |
Use Scenario: Charge current verification and overcurrent cutoff in 16.8 V (4S Li-ion) fast-charging circuits. IC Role / Device Role / Timing Role: Shunt-based current feedback to charger IC, with CMP2 OUT signaling fault to disable charging FETs. Use Value: 1.2-V REF OUT supplies precise bias to external op-amp current limit comparator - improves accuracy vs. internal bandgap references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-shunt monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA204AIDGST | 50 V/V gain (vs. 20 V/V); same pinout, package, and feature set | Better resolution for lower shunt voltages (e.g., 40 mV full-scale), but reduced dynamic range at high currents | Select when shunt voltage is constrained to ≤40 mV and higher gain is needed for ADC LSB utilization |
| INA205AIDGST | 100 V/V gain; identical SOIC-14 footprint and comparator architecture | Enables use of <10 mΩ shunts in high-current (>20 A) applications; increased sensitivity to noise and offset | Choose for ultra-low-resistance shunts where 100× scaling maximizes signal-to-noise ratio at the cost of reduced common-mode headroom |
Compared with INA204AIDGST and INA205AIDGST, the INA203AIDGST provides optimal trade-off between noise immunity, common-mode margin, and ADC interface simplicity for mid-range current sensing (5–15 A) with 20–100 mV shunt drops.
Availability
INA203AIDGST is available at Aetrix Electronics and suitable for telecom power supplies, automotive body control modules, industrial PLC output stages, and lithium-ion battery charger safety circuits requiring stable component supply and long-term lifecycle support.
Supply support for INA203AIDGST 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 headquartered in Dallas, Texas, designing analog and embedded processing chips for industrial, automotive, and communications markets.
The INA20x family was developed specifically for high-accuracy, high-common-mode unidirectional current sensing in power management systems - integrating amplifier, dual comparators, and reference to reduce solution size and improve reliability.
FAQ
What is the maximum common-mode voltage the INA203AIDGST can measure?
The INA203AIDGST supports a common-mode input voltage range from –16 V to +80 V. This allows it to monitor high-side shunt resistors in 48-V telecom systems and negative-rail battery monitoring applications without external level-shifting circuitry. The specification is guaranteed across the full operating temperature range of –40°C to +125°C, as confirmed in Section 7.3 of the SBOS393E datasheet.
Does the INA203AIDGST require external components to operate as a basic current monitor?
Yes - the INA203AIDGST requires at minimum a bypass capacitor (0.01 μF) between VS and GND, and pull-up resistors (e.g., 4.7 kΩ) on CMP1 OUT and CMP2 OUT for proper open-drain operation. For stable analog output, a 10-kΩ load to GND is recommended on the OUT pin. These requirements are specified in Figure 28 and Section 8.3.1 of the SBOS393E datasheet.
How is the delay time for Comparator 2 set on the INA203AIDGST?
The delay time for Comparator 2 on the INA203AIDGST is set by connecting a capacitor between the CMP2 DELAY pin and GND. The relationship is linear: tD = 5 × CDELAY, where tD is in seconds and CDELAY is in microfarads. A 0.1 μF capacitor yields 0.5 s delay, as verified in Section 7.6 and Figure 29 of the SBOS393E datasheet.
Can the internal 0.6-V reference be overridden on both comparators of the INA203AIDGST?
Yes - in the 14-pin SOIC package (INA203AIDGST), both Comparator 1 (pin 3) and Comparator 2 (pin 6) accept external reference voltages to override the internal 0.6-V reference. This is explicitly documented in the Pin Functions table (Section 6) and Feature Description (Section 8.3.3) of SBOS393E, enabling custom threshold programming and window-comparator topologies.
What is the total output error specification for the INA203AIDGST over temperature?
The INA203AIDGST has a total output error of ±3.5% over the full temperature range of –40°C to +125°C, as specified in Section 7.5 (Electrical Characteristics: Current-Shunt Monitor). This includes contributions from gain error, offset voltage drift, and linearity - verified under standard test conditions with VCM = 12 V and VSENSE = 120 mV.
INA203AIDGST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Current Monitor
- Sensing Method:
- High-Side
- Accuracy:
- ±3.5%
- Voltage - Input:
- -16V ~ 80V
- Current - Output:
- 1mA
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-VSSOP
INA203AIDGST FAQ
1.How can I place an order for INA203AIDGST through Aetrix?
Please submit a Request for Quotation (RFQ) for INA203AIDGST 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 INA203AIDGST reliable?
The price and inventory of INA203AIDGST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA203AIDGST is usually 5 days.
3.What payment methods are accepted for INA203AIDGST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA203AIDGST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA203AIDGST?
INA203AIDGST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA203AIDGST 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 INA203AIDGST?
For technical support, including INA203AIDGST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA203AIDGST requirements.
6.How does Aetrix verify that INA203AIDGST is sourced from the original manufacturer or authorized distributors?
All INA203AIDGST 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 INA203AIDGST meets industry standards.
7.What is the process for return or replacement of INA203AIDGST?
All INA203AIDGST units undergo pre-shipment inspection (PSI). If there is an issue with INA203AIDGST, 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 INA203AIDGST part is unused and in its original packaging.
Return procedure for INA203AIDGST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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