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Texas Instruments LM285BXZ — Discrete Semiconductors
Texas Instruments

LM285BXZ Voltage Reference, Shunt, Adjustable, ±1%, TO-92-3

MPNLM285BXZ
End of Life

onsemi LM285BXZ, Shunt Voltage Reference, Adjustable, ±1% Tolerance, 1.24V to 5.3V Output, 20mA Output, 45µA Cathode, 30ppm/°C, TO-226-3/TO-92-3, Through Hole, -40°C to 85°C.

$1.41Ref. price · indicative, final on quote
LM285BXZ datasheet
PackagingTO-226-3, TO-92-3 (TO-226AA)
StockContact for availability
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Specifications

LM285BXZ Technical Specifications
ParameterValue
Output typeAdjustable
Mounting typeThrough Hole
Reference typeShunt
Voltage - output5.3 V
Voltage - output (Min (Fixed))1.24V
Current - output20 mA
Current - cathode45 µA
Operating temperature-40°C ~ 85°C (TA)
PackageBulk
Tolerance±1%
CaseTO-226-3, TO-92-3 (TO-226AA)
Noise - 10Hz to 10kHz50µVrms
Temperature coefficient30ppm/°C

Product details

Shunt reference in a TO-92 — what it does and where it fits

The LM285BXZ: The shunt-mode design lets you set the output between 1.24 V and 5.3 V with two external resistors, covering ADC bias and op-amp rails. ±1% tolerance and 30 ppm/°C tempco keep drift predictable across the -40°C to 85°C range.

Package and assembly — through-hole reality

The TO-92-3 is a three-lead through-hole package. It is hand-inserted or wave-soldered onto the board. No SMT reflow profile applies. The supplier device package is also TO-92-3.

Lifecycle and compliance

RoHS compliance is listed as non-compliant, so verify whether your project allows lead-bearing parts.

Frequently asked questions

Is LM285BXZ a shunt or series voltage reference?

It is a shunt reference — it operates like a programmable Zener diode, requiring a series resistor from the supply to the cathode to set the bias current.

What is the tolerance and temperature stability of LM285BXZ?

Initial tolerance is ±1%. The temperature coefficient is 30 ppm/°C over the -40°C to 85°C operating range.

Can LM285BXZ replace LM285Z?

The LM285BXZ is a higher-tolerance version of the base LM285Z. The B-suffix indicates ±1% tolerance versus the standard ±2% or ±3% grades. Pinout and package are the same TO-92-3, so it is a drop-in replacement where tighter accuracy is needed.

When sourcing LM285BXZ, what is the closest functional alternative?

A surface-mount alternative with tighter specs is the LM4132AMF-4.1/NOPB, a series reference with ±0.05% tolerance, 20 ppm/°C tempco, and fixed 4.096 V output in SOT-23. It is not pin-compatible — different package and topology — but serves a similar voltage-reference role where higher accuracy and SMT assembly are required.