Texas Instruments LM385PSRE4-1-2, shunt voltage reference, fixed 1.235 V output, ±2% tolerance, 20 mA output, 8-SOIC (0.209", 5.30mm width), surface mount, 0°C~70°C.
| Parameter | Value |
|---|---|
| Output type | Fixed |
| Mounting | Surface Mount |
| Reference type | Shunt |
| Voltage - output (Min (Fixed)) | 1.235V |
| Output current | 20 mA |
| Current - cathode | 15 µA |
| Operating temperature | 0°C~70°C(TA) |
| Package | Tape & Reel (TR) |
| Tolerance | ±2% |
| Case | 8-SOIC (0.209\", 5.30mm Width) |
| Noise - 10Hz to 10kHz | 60µVrms |
| Temperature coefficient | 20ppm/°CTypical |
As a shunt reference, it behaves like a two-terminal Zener — the 20 mA output current capability and 15 µA minimum cathode current define the bias resistor selection for the application.
The temperature coefficient is 20 ppm/°C typical, and noise from 10 Hz to 10 kHz is 60 µVrms — both figures are adequate for 8- to 10-bit ADC references in moderate environments.
Yes, a shunt reference like the LM385PSRE4-1-2 can be used in a 3.3 V system. The bias resistor must be chosen to supply the cathode current (minimum 15 µA) plus the load current while keeping the total below the 20 mA output rating.
No official replacement or successor part is listed by Texas Instruments for the LM385PSRE4-1-2. For a pin-compatible alternative, consider the LM385-1.2 series in the same 8-SOIC package — confirm the tolerance and temperature range match your BOM requirements.