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Texas Instruments INA208AIDG4
- Part No.:
- INA208AIDG4
- Manufacturer:
- Texas Instruments
- Category:
- Current Regulation/Management
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
INA208AIDG4.pdf
- Description:
- IC CURRENT MONITOR 3.5% 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,171
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Product details
Overview
INA208AIDG4 from Texas Instruments is a unidirectional current-shunt monitor IC with 100 V/V gain, dual open-drain comparators (one latching, one with programmable delay), and integrated 1.2-V reference output. It operates from 2.7 V to 18 V, supports common-mode input voltages from –16 V to 80 V, and delivers 500-kHz bandwidth for real-time shunt current sensing in high-side or low-side configurations. It is used in overcurrent protection circuits for telecom power supplies and battery chargers.
For engineers reviewing the INA208AIDG4 datasheet, INA208AIDG4 pinout, INA208AIDG4 application, or INA208AIDG4 equivalent, this page provides verified technical context, SO-14/TSSOP-14 package mapping, comparator timing behavior, gain accuracy over temperature, and validated alternative parts for current-sense system design.
Technical Context
The INA208AIDG4 implements a precision current-sense amplifier with fixed 100 V/V gain, enabling accurate conversion of ±150 mV shunt voltage drops into 0–15 V output signals. Its dual comparators operate with internal 0.6-V references (overridable on pins 3 and 6), where Comparator 1 features latch-and-reset functionality via active-low CMP1 RESET, and Comparator 2 supports user-programmable delay via external capacitor on CMP2 DELAY pin.
It integrates a stable 1.2-V reference output (pin 12) with ≤100 ppm/°C drift and load regulation of ≤2 mV/mA, usable for biasing external circuitry. The device maintains 3.5% maximum total output error over –40°C to 125°C and achieves 100 dB minimum CMRR at 12 V common-mode, supporting robust operation in noisy industrial power rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 100 V/V - Converts 100 mV shunt drop to 10 V output; enables high-resolution sensing with standard ADCs. |
| Common-mode range | –16 V to 80 V - Supports direct high-side sensing in 48 V telecom systems and negative-rail applications. |
| Bandwidth | 200 kHz - Sufficient for fast overcurrent detection in switching power supplies and motor drives. |
| Quiescent current | 1.8–2.2 mA - Enables low-power monitoring in always-on battery-backed systems. |
| Reference output | 1.2 V ±12 mV - Stable, buffered reference for comparator thresholds or external analog circuitry. |
| Comparator 1 response | 1.3 µs typical - Enables sub-microsecond fault detection with latch retention until reset. |
| Total output error | ±3.5% max over –40°C to 125°C - Ensures reliable trip-point consistency across automotive and industrial environments. |
Pinout & Package
INA208AIDG4 is available in SO-14 (8.65 mm × 3.91 mm) and TSSOP-14 (5.00 mm × 4.40 mm) packages. Both share identical pinout and function mapping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VS) | Power supply input | Accepts 2.7–18 V single supply; powers all internal blocks including comparators and reference. |
| 2 (OUT) | Analog output | Voltage output = 100 × (VIN+ − VIN−); rail-to-rail swing capability supports wide dynamic range. |
| 3 (CMP1 IN− / 0.6V REF) | Comparator 1 negative input / reference tap | Internal 0.6-V reference accessible externally; can be overridden for custom threshold setting. |
| 4 (CMP1 IN+) | Comparator 1 positive input | Compares against pin 3 reference or external signal; triggers latched CMP1 OUT on overthreshold. |
| 5 (CMP2 IN−) | Comparator 2 negative input | Standard comparator input; referenced to internal or external 0.6-V source on pin 6. |
| 6 (CMP2 IN+ / 0.6V REF) | Comparator 2 positive input / reference tap | Second 0.6-V reference node; overrideable to set asymmetric trip points. |
| 7 (GND) | Analog ground | Return path for shunt current measurement and internal bias networks; must be star-connected for accuracy. |
| 8 (CMP1 RESET) | Active-low latch reset | Pull low to clear CMP1 OUT latch; open or grounded for automatic reset on power-up. |
| 9 (CMP2 DELAY) | Capacitor connection for delay timing | Connects to external capacitor (e.g., 0.1 µF → 0.5 s delay); controls debounce or intentional fault hold-off. |
| 10 (CMP2 OUT) | Comparator 2 open-drain output | Drives external pull-up; asserts on threshold breach with user-defined delay; non-latching. |
| 11 (CMP1 OUT) | Comparator 1 open-drain output | Latched output remains asserted until CMP1 RESET is pulsed; ideal for fault flag storage. |
| 12 (1.2V REF OUT) | Reference voltage output | Stable 1.2-V source (±12 mV) with ≤1 mA load capability; usable for sensor bias or ADC reference. |
| 13 (VIN−) | Shunt low-side input | Connects to shunt resistor's low side; supports bidirectional common-mode range down to –16 V. |
| 14 (VIN+) | Shunt high-side input | Connects to shunt resistor's high side; enables true high-side current sensing up to +80 V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent comparators | One latching (CMP1) with reset control, one delay-programmable (CMP2) - enables hierarchical fault handling (e.g., immediate shutdown + delayed warning). |
| 100 V/V fixed gain | Optimized for 100 mV full-scale shunt drops; eliminates gain-setting resistors and associated tolerance errors. |
| 1.2-V reference output | Low-drift (≤100 ppm/°C), buffered reference usable for external circuitry without loading internal precision nodes. |
| –16 V to 80 V common-mode range | Supports direct sensing on high-voltage rails (e.g., 48 V telecom, 60 V EV battery packs) without level-shifting. |
| SO-14 and TSSOP-14 packaging | Industry-standard footprints with thermal resistance RθJA = 84.9°C/W (SOIC) and 112.6°C/W (TSSOP) - suitable for convection-cooled industrial PCBs. |
Applications
| Telecom Power Supply Monitoring | Battery Charger Overcurrent Protection |
|---|---|
|
Use Scenario: Real-time monitoring of 48 V DC-DC converter output current to detect short-circuit faults before MOSFET failure. IC Role / Device Role / Timing Role: INA208AIDG4 senses shunt voltage, amplifies to 10 V scale, and triggers CMP1 latch within 1.3 µs to assert permanent fault flag. Use Value: Prevents catastrophic failure by enabling immediate system shutdown with no software dependency. |
Use Scenario: Detecting overcurrent during lithium-ion battery charging cycles to halt charge before thermal runaway. IC Role / Device Role / Timing Role: INA208AIDG4 monitors cell-string current; CMP2 with 100-ms delay avoids false trips from inrush transients while catching sustained overloads. Use Value: Improves safety certification compliance (UL 1642, IEC 62133) through hardware-enforced current limits. |
| Automotive Body Control Module | Industrial Motor Drive Current Sensing |
|
Use Scenario: Monitoring 12 V supply current to headlights and HVAC loads for predictive fuse diagnostics. IC Role / Device Role / Timing Role: INA208AIDG4 measures high-side current with –16 V to 16 V common-mode tolerance; 1.2 V REF powers external ADC reference. Use Value: Enables OEM diagnostic logging of load degradation trends without adding discrete voltage dividers. |
Use Scenario: Closed-loop current feedback in 24 V BLDC motor drives where shunt is placed on low-side return path. IC Role / Device Role / Timing Role: INA208AIDG4 provides 200 kHz bandwidth analog output to motor controller ADC; CMP1 latch flags stall conditions. Use Value: Maintains torque control fidelity under PWM noise while providing hardware-level stall protection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-sense monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA209AIDR | 200 V/V gain, integrated 12-bit ADC, I²C interface, same SO-14 package | Replaces analog output with digital reporting; requires microcontroller firmware integration | Select when digital BOM consolidation and telemetry logging are prioritized over analog simplicity. |
| MAX4005EUA+ | 100 V/V gain, single comparator (no latch/delay), 1.23 V reference, µMAX-8 package | Lacks dual-comparator architecture and programmable delay; smaller footprint but reduced fault-handling flexibility | Select when space-constrained designs require basic overcurrent detection without hierarchical response. |
Compared with INA208AIDG4, INA209AIDR adds digital telemetry at the cost of analog immediacy, while MAX4005EUA+ reduces feature count for size savings-neither offers the exact combination of latched + delayed comparators with 1.2-V reference in SO-14.
Availability
INA208AIDG4 is available at Aetrix Electronics and suitable for telecom power management, battery charger protection, and automotive body control modules requiring stable component supply and long-term industrial lifecycle support.
Supply support for INA208AIDG4 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 current-sensing solutions.
The INA20x family-including INA208AIDG4-is designed specifically for high-accuracy, high-common-mode unidirectional current measurement in power systems where reliability, thermal stability, and integrated fault signaling are critical.
FAQ
What is the maximum common-mode voltage supported by the INA208AIDG4?
The INA208AIDG4 supports a common-mode input voltage range of –16 V to 80 V on its VIN+ and VIN− pins. This allows direct high-side current sensing in 48 V telecom systems and compatibility with negative-rail applications such as industrial PLC I/O modules. Operation at the extremes requires adherence to absolute maximum ratings and proper PCB layout to maintain CMRR performance.
How does the CMP2 DELAY pin function on the INA208AIDG4?
The CMP2 DELAY pin on the INA208AIDG4 accepts an external capacitor to program comparator 2's response delay. Using Equation tD = 5 × CDELAY (with CDELAY in µF), a 0.1 µF capacitor yields ~0.5 s delay. This delay applies to both rising and falling edges of CMP2 OUT and is implemented via internal current sources charging the capacitor to 0.6 V threshold - enabling hardware-based debounce without MCU intervention.
Can the 1.2 V reference output of the INA208AIDG4 drive external circuitry?
Yes, the 1.2 V REF OUT pin (pin 12) on the INA208AIDG4 is specified for up to 1 mA load current with ≤2 mV/mA load regulation. It maintains ≤100 ppm/°C drift over –40°C to 85°C and is buffered to isolate external loads from internal reference nodes. It is commonly used to bias external comparators or serve as ADC reference in compact current-monitoring subsystems.
What is the purpose of the CMP1 RESET pin on the INA208AIDG4?
The CMP1 RESET pin (pin 8) on the INA208AIDG4 is an active-low input that clears the latched state of Comparator 1 output (CMP1 OUT). When pulled low, it forces CMP1 OUT high-impedance (open-drain released), allowing external pull-up to restore logic-high state. Leaving it open or grounded enables automatic reset on power-up, ensuring predictable initial comparator behavior without external control logic.
Does the INA208AIDG4 support bidirectional current sensing?
No, the INA208AIDG4 is explicitly a unidirectional current-shunt monitor. Its architecture assumes current flow direction that produces a positive differential voltage (VIN+ > VIN−), and its output voltage cannot go below GND. For bidirectional applications, TI's INA226 or INA240 families provide symmetric output swing and true zero-centered measurement capability - the INA208AIDG4 is optimized for high-side or low-side unidirectional overload detection only.
INA208AIDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- 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
INA208AIDG4 FAQ
1.How can I place an order for INA208AIDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for INA208AIDG4 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 INA208AIDG4 reliable?
The price and inventory of INA208AIDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for INA208AIDG4 is usually 5 days.
3.What payment methods are accepted for INA208AIDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for INA208AIDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for INA208AIDG4?
INA208AIDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your INA208AIDG4 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 INA208AIDG4?
For technical support, including INA208AIDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your INA208AIDG4 requirements.
6.How does Aetrix verify that INA208AIDG4 is sourced from the original manufacturer or authorized distributors?
All INA208AIDG4 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 INA208AIDG4 meets industry standards.
7.What is the process for return or replacement of INA208AIDG4?
All INA208AIDG4 units undergo pre-shipment inspection (PSI). If there is an issue with INA208AIDG4, 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 INA208AIDG4 part is unused and in its original packaging.
Return procedure for INA208AIDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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