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Texas Instruments INA203AID
- Part No.:
- INA203AID
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA203AID.pdf
- Description:
- IC CURRENT MONITOR 3.5% 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,599
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Product details
Overview
INA203AID from Texas Instruments is a unidirectional current-shunt monitor IC with dual open-drain comparators, 20 V/V gain, –16 V to 80 V common-mode input range, and 1.2-V reference output - designed for high-side or low-side shunt sensing in power rail monitoring and overcurrent protection circuits.
For engineers reviewing the INA203AID datasheet, INA203AID pinout, INA203AID application, or INA203AID equivalent, this device delivers precise current measurement with latchable comparator 1, user-programmable delay on comparator 2, and stable operation across –40°C to 125°C - critical for notebook, telecom, and automotive power management designs.
Technical Context
The INA203AID integrates a precision current-sense amplifier with fixed 20 V/V gain, two independent comparators sharing internal 0.6-V references (overridable on 14-pin packages), and a buffered 1.2-V reference output. Its architecture supports direct connection to shunt resistors while rejecting common-mode voltages up to 80 V.
Comparator 1 features latching behavior resettable via active-low CMP1 RESET; Comparator 2 includes a capacitor-programmable delay (via CMP2 DELAY pin) and operates with 1.3-μs typical response time. Both comparators drive open-drain outputs compatible with 5.1-kΩ pull-up to VS.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20 V/V - scales 100-mV shunt voltage to 2-V output, enabling direct ADC interfacing without external amplification |
| Common-Mode Range | –16 V to 80 V - supports high-side sensing in 48-V telecom systems and negative-rail applications |
| Bandwidth | 500 kHz - enables accurate transient current capture in fast-switching DC/DC converters |
| Quiescent Current | 1.8 mA - allows integration into always-on power monitors without excessive standby loss |
| Reference Output | 1.2 V ±12 mV - provides stable bias for comparator thresholds or external circuitry in SO-14/TSSOP-14 packages |
| Comparator Hysteresis | CMP1: ±8 mV - prevents chatter during slow-rising fault conditions; CMP2: ±8 mV |
| Operating Temperature | –40°C to 125°C - qualified for under-hood automotive and industrial embedded environments |
Pinout & Package
INA203AID is packaged in SOIC-14 (8.65 mm × 3.91 mm) with exposed pad not present; thermal resistance RθJA = 84.9°C/W. Pin functions are validated per TI SBOS393E Rev E.
| 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 directly to shunt resistor low side; supports –16 V to 80 V differential range |
| OUT | Analog output | Voltage output = 20 × (VIN+ − VIN−); drives 10-kΩ load with ≤2.5-mV offset error |
| CMP1 IN+ | Comparator 1 noninverting input | Accepts external threshold signal; default reference is internal 0.6 V |
| CMP1 IN−/0.6V REF | Comparator 1 inverting input / reference override | Shorted internally to 0.6-V reference; externally driven to override threshold |
| CMP2 IN+ | Comparator 2 noninverting input | Accepts external trigger; default threshold = 0.6 V |
| CMP2 IN−/0.6V REF | Comparator 2 inverting input / reference override | Shorted internally to 0.6-V reference; externally driven to override threshold |
| CMP1 RESET | Active-low latch reset | Pulled low to clear latched CMP1 OUT; open or high enables transparent mode |
| CMP2 DELAY | Capacitor connection for delay timing | Delay = 5 × CDELAY (μF → seconds); e.g., 0.1 μF yields 0.5 s delay |
| CMP1 OUT | Open-drain comparator 1 output | Latched output; requires external pull-up to VS (max 18 V) |
| CMP2 OUT | Open-drain comparator 2 output | Delayed output; requires external pull-up to VS (max 18 V) |
| 1.2V REF | Buffered reference output | Stable 1.2-V source (±12 mV), 1-mA max load, 10-nF max capacitive load |
| VS | Power supply | Single 2.7–18-V supply; powers all internal blocks including comparators and reference |
| GND | Analog ground | Return path for sense inputs, reference, and comparator circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional current sensing | Accurate measurement of forward current only, optimized for battery charging and DC/DC output monitoring |
| Latching comparator 1 | Retains overcurrent event state until explicit reset via CMP1 RESET pin - eliminates need for microcontroller polling |
| User-programmable comparator 2 delay | Capacitor-timed delay (0.5 s typical with 0.1 μF) prevents false triggering from short transients like inrush currents |
| Wide common-mode input range | Operates with shunt placed on high side of 48-V telecom rails or low side of –12-V supplies without level-shifting circuitry |
| Integrated 1.2-V reference | Provides precision bias for external comparators or ADC references - reduces BOM count and layout complexity |
Applications
| Overcurrent Protection in Telecom Power Supplies | Battery Charge Management in Notebooks |
|---|---|
Use Scenario: Monitoring 48-V backplane current to detect short-circuit faults before fuse blow. IC Role / Device Role / Timing Role: INA203AID senses shunt voltage, compares against threshold via CMP1, and latches fault signal for system shutdown. Use Value: 500-kHz bandwidth captures fast fault edges; latch holds alarm until service intervention - avoids repeated tripping. |
Use Scenario: Measuring charge/discharge current in Li-ion battery packs with integrated protection logic. IC Role / Device Role / Timing Role: INA203AID provides analog current output to MCU ADC and triggers CMP2 with programmable delay to ignore inrush spikes. Use Value: 20-V/V gain maps 50-mV shunt drop to 1-V full-scale - matches typical 12-bit ADC input range; delay prevents false overcurrent alarms. |
| Automotive Body Control Module (BCM) | Industrial Motor Drive Current Monitoring |
Use Scenario: Detecting overcurrent in 12-V lighting circuits (headlamps, fog lamps) subject to hot-plug surges. IC Role / Device Role / Timing Role: INA203AID's –16-V to 80-V common-mode range accommodates load-dump transients; CMP1 latches fault for CAN alert transmission. Use Value: Latch function ensures fault persistence through microcontroller reset cycles; 125°C rating supports under-hood placement. |
Use Scenario: Monitoring phase current in 24-V brushless DC motor drives where shunt is placed on low side. IC Role / Device Role / Timing Role: INA203AID delivers linear analog output to motor control IC and asserts CMP2 after configurable delay to confirm sustained overload. Use Value: 1.8-mA quiescent current enables continuous monitoring without compromising efficiency; 80-V CMR handles regenerative braking voltage spikes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA204AID | 50 V/V gain (vs. 20 V/V); same pinout, package, and feature set | Better suited for lower shunt voltages (e.g., 20-mV full-scale), but requires higher-resolution ADC or scaling | Select when shunt voltage is constrained below 50 mV and higher gain improves SNR |
| INA206AID | Dual-comparator with reversed polarity on CMP2; 20 V/V gain; SO-14 package | Supports bidirectional current detection via inverted CMP2 threshold - not available in INA203AID | Choose when detecting reverse current flow (e.g., regenerative braking) is required alongside overcurrent protection |
Compared with INA204AID and INA206AID, the INA203AID offers optimal dynamic range for 50–100-mV shunt drops, maintains latch functionality without polarity inversion, and simplifies threshold design with fixed 0.6-V references - making it ideal for cost-sensitive, single-direction overcurrent detection.
Availability
INA203AID is available at Aetrix Electronics and suitable for telecom power supplies, notebook battery management, and automotive body control modules requiring stable component supply and extended temperature support.
Supply support for INA203AID 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 emphasis on reliability, precision, and industrial-grade qualification.
The INA203AID belongs to TI's current-shunt monitor product line, engineered for high-accuracy, high-common-mode current sensing in power management systems where robust fault detection and minimal external components are essential.
FAQ
What is the maximum common-mode voltage the INA203AID can handle?
The INA203AID supports a common-mode input voltage range of –16 V to 80 V, verified per TI SBOS393E Absolute Maximum Ratings. This allows direct high-side sensing in 48-V telecom systems and compatibility with negative supply rails. Operation beyond these limits risks permanent damage, and the device must be used within –16 V to 80 V for guaranteed performance across –40°C to 125°C.
Does the INA203AID require external components for basic operation?
Yes - the INA203AID requires a minimum 0.01-μF bypass capacitor between VS and GND, placed near the pins. For stable comparator operation, 5.1-kΩ pull-up resistors are needed on CMP1 OUT and CMP2 OUT. The 1.2-V reference output supports up to 1 mA but requires ≤10 nF capacitive load to prevent oscillation. No external gain-setting resistors are needed due to its fixed 20 V/V architecture.
How does the latching function of Comparator 1 work in the INA203AID?
In the INA203AID, Comparator 1 output remains latched high after crossing its threshold until the active-low CMP1 RESET pin is pulled below 1.1 V. Leaving CMP1 RESET open or tied to VS results in transparent (non-latching) operation. The latch ensures fault signals persist through power cycles or microcontroller resets - critical for safety-critical overcurrent detection in power supplies and motor drives.
Can the internal 0.6-V comparator references be overridden in the INA203AID?
Yes - on the 14-pin SOIC and TSSOP packages (including INA203AID), pins 3 (CMP1 IN−/0.6V REF) and 6 (CMP2 IN−/0.6V REF) allow external voltage injection to override the internal 0.6-V reference. Driving these pins above GND establishes a custom threshold. However, injecting >1 mA into either pin introduces reference errors, so external drivers must limit current to <1 mA per TI SBOS393E Section 8.3.5.
What is the purpose of the CMP2 DELAY pin on the INA203AID?
The CMP2 DELAY pin on the INA203AID accepts an external capacitor to program a user-defined delay (tD = 5 × CDELAY) before Comparator 2 output changes state. For example, a 0.1-μF capacitor yields ~0.5 s delay. This prevents false triggering from brief transients such as inrush current or switching noise - a key differentiator versus non-delayed comparators in battery chargers and motor starters.
INA203AID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 14-SOIC
INA203AID FAQ
1.How can I place an order for INA203AID through Aetrix?
Please submit a Request for Quotation (RFQ) for INA203AID 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 INA203AID reliable?
The price and inventory of INA203AID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA203AID is usually 5 days.
3.What payment methods are accepted for INA203AID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA203AID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA203AID?
INA203AID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA203AID 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 INA203AID?
For technical support, including INA203AID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA203AID requirements.
6.How does Aetrix verify that INA203AID is sourced from the original manufacturer or authorized distributors?
All INA203AID 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 INA203AID meets industry standards.
7.What is the process for return or replacement of INA203AID?
All INA203AID units undergo pre-shipment inspection (PSI). If there is an issue with INA203AID, 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 INA203AID part is unused and in its original packaging.
Return procedure for INA203AID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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