Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Gain | 50 V/V fixed |
| Common Mode | −16 V to +80 V |
| Supply | 2.7 V to 18 V |
| Bandwidth | 300 kHz |
| Offset Voltage | ±0.5 mV typical; 2 mV maximum at 25°C under stated conditions |
| Gain Error | ±1% maximum at 25°C for VSENSE 20-100 mV |
| Supply Current | 900 µA maximum |
| Exact Package / Packing | SOT-23 (DBV), 5 pins; 3000-piece large tape and reel |
Product Overview
INA194AIDBVR provides 50 V/V fixed gain while sensing shunt voltages on buses from −16 V to +80 V. The common-mode range is independent of its 2.7 V to 18 V supply, allowing the measurement circuit to survive and measure bus conditions far outside the controller rail.
Compared with INA193, INA194 doubles-and-a-half the voltage gain from 20 V/V to 50 V/V, reducing the shunt voltage needed to use a given ADC range. The tradeoff is lower bandwidth: 300 kHz rather than 500 kHz.
INA194 uses the family’s pinout #1. INA197 has the same 50 V/V gain but pinout #2, so it should not be treated as a PCB-compatible substitute simply because the transfer gain matches.
For related devices, see HKEQGOO’s Current Sense Amplifiers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | INA194AIDBVR |
| Gain | 50 V/V fixed |
| Common Mode | −16 V to +80 V |
| Supply | 2.7 V to 18 V |
| Bandwidth | 300 kHz |
| Offset Voltage | ±0.5 mV typical; 2 mV maximum at 25°C under stated conditions |
| Gain Error | ±1% maximum at 25°C for VSENSE 20-100 mV |
| Supply Current | 900 µA maximum |
| Exact Package / Packing | SOT-23 (DBV), 5 pins; 3000-piece large tape and reel |
| Manufacturer Status | Active / Production |
| Part Marking | BJI |
Functional Highlights
50 V/V reduces shunt loss for a given ADC span
A smaller VSENSE can produce the same output amplitude as INA193, allowing lower shunt resistance and dissipation. Offset becomes a larger percentage of the signal as VSENSE is reduced.
Below 20 mV, common-mode-dependent behavior becomes more important
TI specifies a separate low-VSENSE region. This matters precisely in low-loss designs that use a small shunt, so error should be evaluated at the real minimum and nominal current rather than only at full scale.
Design Considerations
- Build the error budget at the actual VSENSE range, especially below 20 mV.
- Check maximum output against V+ headroom; the 50 V/V gain can saturate quickly with large shunt drops.
- Keep the pinout #1 requirement explicit if comparing with INA197.
Product Status and Exact Order Code
Manufacturer status: Active / Production
Texas Instruments lists INA194AIDBVR 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 BJI.
Related Engineering Resources
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