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LM336Z-2.5

2.5V shunt reference, 0.2Ohm Zout, 400uA-10mA, TO-92

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Manufacturer Part：

LM336Z-2.5

Package：

TO-92 (5.2 x 3.7 mm, through-hole)

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Description

Product Overview

The LM336Z-2.5 from Texas Instruments (originally National Semiconductor) is a precision 2.5V shunt voltage reference diode in a TO-92 through-hole package. With 0.2Ohm dynamic impedance, 400uA to 10mA operating current range, and adjustable temperature coefficient via a third terminal, it provides a stable 2.5V reference for 5V logic systems.

Key Specifications

Reference Voltage 2.49V (typical)
Initial Accuracy +/-4% (standard), +/-1% (B grade)
Dynamic Impedance 0.2 Ohm (typical)
Operating Current Range 400 uA to 10 mA
Temperature Coefficient Adjustable via ADJ pin
Temperature Stability 6 mV typical (over 0-70C)
Operating Temperature 0 to +70 C
Package TO-92 (3-pin)

Features

  • Precision 2.5V shunt reference diode
  • 0.2Ohm low dynamic impedance
  • 400uA to 10mA wide operating current range
  • +/-1% initial tolerance available (B grade)
  • Adjustable temperature coefficient via ADJ pin
  • Fast turn-on time
  • Operates as positive or negative reference
  • TO-92 through-hole package
  • Convenient 2.5V reference from 5V supplies

Applications

  • Reference for 5V logic systems
  • 8-bit A/D and D/A converter reference
  • Digital voltmeters
  • Power supply monitoring

The LM336Z-2.5 from Texas Instruments is a precision 2.5V shunt voltage reference diode in a 3-pin TO-92 through-hole package. The Z suffix denotes the TO-92 package and the -2.5 indicates the nominal reference voltage. Operating as a low-temperature-coefficient 2.5V Zener diode with 0.2Ohm dynamic impedance, it provides a stable reference voltage over a wide operating current range of 400uA to 10mA. A third terminal (ADJ) allows the reference voltage and temperature coefficient to be trimmed for minimum drift using an external resistor and diode network. The 2.5V output makes it particularly convenient as a reference for 5V logic-powered systems, since it is exactly half of the 5V supply rail. The LM336-2.5 operates from 0 to +70C, while the LM236-2.5 extends to +85C and the LM136-2.5 to +125C.

The LM336Z-2.5 operates as a precision shunt regulator through three terminal functions: (1) Anode-Cathode Path: The device operates as a shunt regulator, similar to a Zener diode but with much better regulation characteristics. Current flows from cathode to anode (reverse bias), and the device maintains approximately 2.49V across these terminals. The 0.2Ohm dynamic impedance means the voltage changes only 0.2V for a 1A change in operating current, which is far superior to a standard 2.5V Zener diode. (2) Adjust (ADJ) Terminal: The third terminal provides access to an internal node that allows trimming of both the output voltage and the temperature coefficient. By connecting a resistor network (typically a 10kOhm potentiometer and a silicon diode) between the ADJ pin and the circuit, the output can be adjusted to exactly 2.490V with minimum temperature drift. (3) Bandgap Reference: The internal circuit uses a bandgap reference architecture, which provides the low temperature coefficient that is difficult to achieve with simple Zener diodes at low voltages. The bandgap circuit compensates for the negative temperature coefficient of the transistor VBE with the positive temperature coefficient of a PTAT (Proportional To Absolute Temperature) voltage.

Pin Name Type Description
1 ADJ Input Adjustment terminal (for tempco trimming)
2 ANODE Power Anode (normally connected to ground)
3 CATHODE I/O Cathode (shunt current / reference output)
  • 5V logic system reference with 2.5V = VCC/2 for A/D converter reference voltage
  • 8-bit DAC reference with 0.2Ohm dynamic impedance providing stable output under load
  • Digital voltmeter reference with ADJ pin trimming to 2.490V for minimum temperature drift
  • Power supply overvoltage monitor comparing scaled supply voltage against 2.5V reference
Model Manufacturer Vref Accuracy Notes
LM336BZ-2.5 TI 2.49V +/-1% B grade, higher accuracy
TL431IDBVR TI 2.495-36V +/-2% Adjustable output
REF3025AIDBZR TI 2.5V +/-0.2% Series reference, higher accuracy
LT1009CS8 ADI 2.5V +/-0.2% Precision 2.5V reference
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