WT431 Adjustable Accurate Reference Source P b Lead(Pb)-Free FEATURES The output voltage can be adjusted to 36V Low dynamic output impedance ,its typical value is 0.2Ω Trapping current capability is 1 to 100mA The typical value of the equivalent temperature factor in the whole temperature scope is 50 ppm/℃ The effective temperature compensation in the working range of full temperature Low output noise voltage Fast on -state response 1.REFERENCE 2.ANODE 3.CATHODE TO-92 1 2 3 ABSOLUTE MAXIMUM RATINGS（Operating temperature range applies unless otherwise specified） SYMBOL VALUE UNITS Parameter Cathode Voltage Cathode Current Range (Continuous) Reference lnput Current Range Power Dissipation Operating temperature Storage temperature Range VKA IKA Iref PD Topr Tstg 37 -100-+150 0.05-+10 770 0-70 -65-+150℃ ELECTRICAL CHARACTERISTICS（Tamb=25℃ Parameter Symbol Reference lnput Voltage Vref VKA=VREF, IKA=10mA MIN TYP MAX UNIT 2.475 2.5 2.525 V mV -1.0 -2.7 m V/V -0.5 -2.0 m V/V IKA= 10mA,R1=10KΩ R2=∞ 1.5 4 μA △lref/△T lKA=10mA, R1=10KΩ R2=∞ TA=full Temperature 0.4 1.2 μA IKA(min) VKA=VREF 0.45 1.0 mA IKA(OFF) VKA=36V ,VREF=0 VKA=VREF,lKA=1 to 100mA f≤1.0KHz 0.05 1.0 μA 0.15 0.5 Ω △Vref/△VKA Dynamic lmpedance conditions 17 Ratio Of Change in Reference lnput Voltage to the change in Cathode Voltage Minimum cathode current for regulation Off-state cathode Current specified） 4.5 △Vref/△T lref Deviation Of Reference lnput Current Over Full Temperature Range Test otherwise VKA =VREF, IKA =10mA Tmin≤Ta≤Tmax △VKA =10V～VREF IKA=10mA △VKA =36V～ 10V Deviation of reference input Voltage Over temperature (note) Reference lnput Current unless V mA mA mW ℃ ℃ ZKA Note:TMIN=0℃ ,TMAX=+70℃ CLASSIFICATION OF Vref Rank Range WEITRON http://www.weitron.com.tw WT431 (0.5%) WT431A (1.0%) WT431B (2.0%) 2.487-2.512 2.475-2.525 2.450-2.550 1/2 01-Jun-09 WT431 WEITRON http://www.weitron.com.tw 2/2 01-Jun-09