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Texas Instruments LM385LPR-1-2 — Analog & Data Acquisition

LM385LPR-1-2 Shunt Voltage Reference, 1.235 V Fixed, ±2%

MPNLM385LPR-1-2
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Texas Instruments LM385LPR-1-2 shunt voltage reference, fixed 1.235 V output, ±2% tolerance, 20 ppm/°C typical drift, 15 µA cathode current, TO-92-3 through-hole, 0°C to 70°C.

$0.6900Ref. price · indicative, final on quote
Independent supplier — new & surplus stockAuthenticity-screened · ESD-safe packingListing updated Jul 2026

Specifications

LM385LPR-1-2 specifications
ParameterValue
Output typeFixed
MountingThrough Hole
Reference typeShunt
Voltage - output (Min (Fixed))1.235V
Output current20 mA
Current - cathode15 µA
Operating temperature0°C~70°C(TA)
PackageTape & Reel (TR); Cut Tape (CT)
Tolerance±2%
CaseTO-226-3, TO-92-3 (TO-226AA) Formed Leads
Noise - 10Hz to 10kHz60µVrms
Temperature coefficient20ppm/°CTypical

Product details

It delivers a stable 1.235 V output with ±2% initial tolerance and a typical temperature coefficient of 20 ppm/°C.

Cathode current and output drive

The shunt can sink up to 20 mA of output current, but the real design constraint is the minimum cathode current of 15 µA. Below that, the reference drops out of regulation. For a 1.235 V rail pulling 1 mA, a 1.2 kΩ series resistor from a 3.3 V supply biases the shunt well above the 15 µA floor. The 60 µVrms noise spec (10 Hz to 10 kHz) is clean enough for most ADC references in the commercial temperature band.

Frequently asked questions

Is LM385LPR-1-2 equivalent to LM385Z?

The LM385Z is a sibling in the same LM385 family, also a 1.235 V shunt reference, but typically offered in a TO-92 package with a wider temperature range. The LM385LPR-1-2 is the Tape & Reel variant with formed leads and commercial temperature grade. They are functionally similar but verify the package and temperature grade against your BOM.