Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Measurement | Unipolar high-side current sensing |
| Supply / Common Mode | 2.7 V to 60 V recommended |
| Full-Scale Sense Voltage | 100 mV to 500 mV recommended |
| Quiescent Current | 25 µA typical |
| Transconductance | 200 µA/V typical |
| Gain Setting | External RL converts output current to voltage |
| Temperature | −40°C to +125°C |
| Exact Package / Packing | SOT-23 (DBV), 5 pins; 3000-piece large tape and reel |
Product Overview
INA168NA/3K extends the low-power INA138 architecture to a 60 V recommended supply and common-mode range. The amplifier converts shunt voltage to output current with approximately 200 µA/V transconductance, and RL then determines the voltage gain seen by the next stage.
The key design freedom is also the key design constraint: RL affects output amplitude, output headroom and bandwidth. A large resistor can produce the desired nominal gain on paper while causing saturation or insufficient transient response in the real bus-voltage range.
For purchasing, the /3K suffix identifies the 3000-piece large tape-and-reel SOT-23-5 option.
For related devices, see HKEQGOO’s Current Sense Amplifiers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | INA168NA/3K |
| Measurement | Unipolar high-side current sensing |
| Supply / Common Mode | 2.7 V to 60 V recommended |
| Full-Scale Sense Voltage | 100 mV to 500 mV recommended |
| Quiescent Current | 25 µA typical |
| Transconductance | 200 µA/V typical |
| Gain Setting | External RL converts output current to voltage |
| Temperature | −40°C to +125°C |
| Exact Package / Packing | SOT-23 (DBV), 5 pins; 3000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | A68 |
Functional Highlights
60 V high-side measurement is independent of the logic/monitor supply rail
The measured bus and the V+ pin can be different voltages. This is useful when a low-voltage controller monitors a substantially higher power rail.
Gain is a system relationship, not a fixed IC number
The transfer includes RS and RL. Full-scale current, shunt dissipation, ADC range and required bandwidth therefore need to be solved together.
Design Considerations
- Select RS for acceptable power loss and full-scale VSENSE before choosing RL.
- Check calculated VOUT against output compliance across the minimum V+ and VIN− conditions.
- Use Kelvin shunt routing and minimize resistance between the shunt and input pins.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists INA168NA/3K as Active / Production; SOT-23 (DBV), 5 pins; 3000-piece large tape and reel; Level-2-260C-1 YEAR; −40°C to +125°C; marking A68.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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