TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Description Pin Assignments The TL431 and TL432 are three terminal adjustable shunt regulators offering excellent temperature stability and output current handling capability up to 100mA. The output voltage may be set to any chosen voltage between 2.5 and 36 volts by selection of two external divider resistors. The devices can be used as a replacement for zener diodes in many applications requiring an improvement in zener performance. Diodes' TL431 has the same electrical specifications as the industry standard `431 and is available in 2 grades with initial tolerances of 1% and 0.5% for the A and B grades respectively. TL431 (Top View) CATHODE 1 3 ANODE REF 2 SOT23 (Top View) 5 ANODE NC Features * * * * * * * Leave floating or 2 connect to pin 5 Temperature range -40 to +125C Reference Voltage Tolerance at 25C * TL431A: 2.495V 1.0% * TL431B: 2.495V 0.5% CATHODE 3 SOT25 Low Output Noise 0.2 Typical Output Impedance Sink Current Capability: 1mA to 100mA Adjustable Output Voltage: VREF to 36V All devices are: * Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2) * Halogen and Antimony Free. "Green" Device (Note 3) (Top View) CATHODE 1 8 REF ANODE 2 7 ANODE ANODE 3 6 ANODE NC 4 5 NC SO-8 SO-8 is a future product TL432 Applications * * * * 4 REF (Top View) Opto-Coupler Linearisers Shunt Regulators Improved Zener Variable Reference REF 1 3 ANODE CATHODE 2 SOT23 Notes: TL431 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated's definitions of Halogen and Antimony free, "Green" and Lead-Free. 3. Halogen and Antimony free "Green" products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 1 of 14 www.diodes.com April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Absolute Maximum Ratings (Note 4) Symbol Parameter VKA Cathode Voltage IKA Continuous Cathode Current IREF Reference Input Current TJ Unit 40 V 150 mA -0.050 to +10 mA +150 -55 to +150 Operating Junction Temperature TST Storage Temperature PD Power Dissipation (Notes 5, 6) Notes: Rating SOT23 330 SOT25 500 SO-8* 700 C C mW 4. Operation above the absolute maximum rating may cause device failure. Operation at the absolute maximum ratings, for extended periods, may reduce device reliability. Unless otherwise stated voltages specified are relative to the ANODE pin. 5. TJ, MAX =150C. 6. Ratings apply to ambient temperature at 25C. Recommended Operating Conditions Symbol Min Max Unit VKA Cathode Voltage VREF 36 V IKA Cathode Current 1 100 mA TA Operating Ambient Temperature -40 +125 C TL431 Parameter *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 2 of 14 www.diodes.com April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Electrical Characteristics (TA = +25C, unless otherwise noted) Symbol Parameter Test Conditions VREF Reference voltage VDEV Deviation of reference voltage over full temperature range (Note 5) VREF Max TL431A 2.470 2.495 2.520 IKA = 10mA TL431B 2.482 2.495 2.507 6 16 14 34 IKA = 10mA o TA = 0 to 70 C o TA = -40 to +85 C o TA = -40 to +125 C 14 34 VKA = 10V to VREF -1.4 -2.7 VKA = 36V to 10V -1 -2 1 4 0.8 1.2 TA = -40 to +85 C 0.8 2.5 TA = -40 to +125oC 0.8 2.5 VKA Ratio of the change in reference voltage to the change in cathode voltage IKA = 10mA IREF Reference input current IKA = 10mA, R1 = 10K, R2 = IREF Typ. VKA = VREF, VKA = VREF, IKA = 10mA, R1 = 10K, R2 = IREF deviation over full temperature range (Note 7) Min o TA = 0 to 70 C o Unit V mV mV/V A A IKA(MIN) Minimum cathode current for regulation VKA = VREF 0.4 0.7 mA IKA(OFF) Off-state current VKA = 36V, VREF = 0V 0.05 0.5 A Dynamic output impedance (Note 8) VKA = VREF, f = 0Hz 0.2 0.5 SOT23 380 SOT25 250 SO-8* 70 |ZKA| JA Notes: Thermal Resistance Junction to Ambient o C/W 7. Deviation of VDEV, and IREF are defined as the maximum variation of the values over the full temperature range. The average temperature coefficient of the reference input voltage VREF is defined as: Vmax VDEV VREF = X 106 VREF @ 25C ppm/C T2 - T1 Vmin Where: T2 - T1 = full temperature change. VREF can be positive or negative depending on whether the slope is VDEV = Vmax - Vmin positive or negative. Notes: 8. The dynamic output impedance, RZ, is defined as: ZKA = VKA IKA T1 Temperature T2 When the device is programmed with two external resistors R1 and R2, the dynamic output impedance of the overall circuit, is defined as: Z' = TL431 V I ZKA *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 1+ R1 R2 3 of 14 www.diodes.com April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Test Circuits Figure 1. Test circuit for VKA = VREF Figure 2. Test circuit for VKA > VREF Figure 3. Test circuit for IOFF TL431 *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 4 of 14 www.diodes.com April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Typical Performance Characteristics 0.2 2600 IKA = 10mA R1 = 10K R2 = IKA = 10mA V KA = VREF TA = 25 C 2560 IREF Reference Current ( A) V REF Reference Voltage (mV) 2580 2540 2520 2500 2480 2460 0.15 0.1 0.05 2440 2420 0 -55 2400 -55 -35 -15 5 25 45 65 85 105 125 TA Free Air Temperature ( C) Reference Voltage vs. Free Air Temperature 150 -35 -15 5 25 45 65 85 105 125 TA Free Air Temperature (C) Reference Current vs. Free Air Temperature 200 V KA = VREF V KA = VREF TA = 25 C TA = 25 C IKA Cathode Current ( A) IKA Cathode Current (mA) 100 50 0 100 IKMIN 0 -50 -100 -2 -1 0 1 2 V KA Cathode Voltage (V) Cathode Current vs. Cathode Voltage 3 -100 -2 0 1 2 V KA Cathode Voltage Cathode Current vs. Cathode Voltage -1 -0.2 0.50 V KA = 36V 0.45 V KA = 3V to 36V V REF = 0 -0.3 0.40 -0.4 0.35 dV REF/dV KA (mV/V) IKOFF Off-State Cathode Current ( A) 3 0.30 0.25 0.20 0.15 -0.5 -0.6 -0.7 -0.8 0.10 -0.9 0.05 0.00 -75 -1.0 -50 75 -25 0 25 50 100 125 TA Free Air Temperature ( C) Off-State Cathode Current vs. Free Air Temperature TL431 -50 *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 5 of 14 www.diodes.com -25 0 25 50 75 100 125 TA Free Air Temperature (C) Ratio of Delta Reference Voltage to Delta Cathode Voltage vs. Free Air Temperature April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Typical Performance Characteristics (cont.) 15 IKA = 10mA 380 V KA = VREF TA = 25C Vn - Equivalent Input Noise Voltage - V V N = Equivalent Input Noise Voltage nV/Hz 400 360 340 320 300 280 260 240 220 200 10 100 1K 10K 100K f- Frequency (Hz) Equivalent Input Noise Voltage vs. Frequency IKA = 10mA V KA = VREF 10 TA = 25 C 5 0 -5 -10 -15 0 1 2 3 4 5 6 7 8 9 10 Time (Seconds) Equivalent Input Noise Voltage Over A 10-S Period Figure 4. Test circuit for noise input voltage TL431 *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 6 of 14 www.diodes.com April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Typical Performance Characteristics (cont.) A V Small-Signal Voltage Amplification (dB) 70 IKA = 10mA TA = 25 C 60 50 40 30 20 10 0 100 10M 10K 100K 1M f Frequency (Hz) Small-Signal Voltage Amplification vs. Frequency 1K Test circuit for voltage amplification 100.0 IKA = 10mA ZKA Reference Impedance ( ) TA = 25 C 10.0 1.0 0.1 Test circuit for reference impedance 0.0 1K TL431 100K 1M f Frequency (Hz) Reference Impedance vs. Frequency 10K *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 10M 7 of 14 www.diodes.com April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Typical Performance Characteristics (cont.) 6 TA = 25 C Input Input and Output Voltage (V) 5 4 3 Out put 2 Test Circuit for Pulse Response 1 0 0 1 2 3 4 5 6 7 t Time (s) Pulse Response 8 9 10 100 90 IKA - Cathode Current - mA 80 TA = 25 C D D C C A B 70 Stable Stable Stable 60 50 B Test Circuit for Curve A 40 30 A VKA = V REF B V KA = 5V C V KA = 10V D V KA = 15V 20 10 0 0.00001 0.0001 0.001 0.01 0.1 1 C L -Load Capacitance - uF Stability Boundary Conditions 10 Test circuit for curves B, C, D Test Circuit for Curves B, C, D The device is stable under all conditions with a load capacitance not exceeding 50pF. The device is stable under all conditions with a load capacitance between 5nF and 20nF. The device is stable under all conditions with a load capacitance exceeding 300nF. With a cathode current not exceeding 5mA, the device is stable with any load capacitance. TL431 *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 8 of 14 www.diodes.com April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Applications Information TL431 *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 9 of 14 www.diodes.com April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Ordering Information Device Package Code Packaging (Note 9) TL431A(B)SA-7 TL431A(B)W5-7 TL431A(B)S-13* TL432A(B)SA-7 SA W5 S SA SOT23 SOT25 SO-8* SOT23 7" Tape and Reel Part Number Quantity Suffix 3000/Tape & Reel -7 3000/Tape & Reel -7 2500/Tape & Reel -13 3000/Tape & Reel -7 Ammo Box Part Number Quantity Suffix NA NA NA NA NA NA NA NA * Suffix "B" denotes TL431B device. Notes: 9. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at http://www.diodes.com/datasheets/ap02001.pdf. TL431 *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 10 of 14 www.diodes.com April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Marking Information (1) SOT23 ( Top View ) 3 XX : Identification code Y : Year 0~9 W : Week : A~Z : 1~26 week; a~z : 27~52 week; z represents 52 and 53 week X : A~Z : Green XX Y W X 1 2 Device Package Identification Code TL431ASA SOT23 AA TL431BSA TL432ASA TL432BSA SOT23 SOT23 SOT23 AB BA BB Device Package Identification Code TL431AW5 TL431BW5 SOT25 SOT25 AA AB (2) SOT25 (3) SO-8* (Top View ) 8 7 6 5 X: tolerance A = 1%, B = 0.5% Logo Part Number TL431X YY : Year : 08, 09,10~ WW : Week : 01~52; 52 represents 52 and 53 week XX: Internal Code YY WW X X 1 TL431 *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 2 3 4 11 of 14 www.diodes.com April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Package Outline Dimensions (All Dimensions in mm) (1) Package type: SOT25 A B C H K M N J L D SOT25 Dim Min Max Typ A 0.35 0.50 0.38 B 1.50 1.70 1.60 C 2.70 3.00 2.80 D 0.95 H 2.90 3.10 3.00 J 0.013 0.10 0.05 K 1.00 1.30 1.10 L 0.35 0.55 0.40 M 0.10 0.20 0.15 N 0.70 0.80 0.75 0 8 All Dimensions in mm (2) Package Types: SOT23 A B C H K M K1 D J TL431 F G *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 L 12 of 14 www.diodes.com SOT23 Dim Min Max Typ A 0.37 0.51 0.40 B 1.20 1.40 1.30 C 2.30 2.50 2.40 D 0.89 1.03 0.915 F 0.45 0.60 0.535 G 1.78 2.05 1.83 H 2.80 3.00 2.90 J 0.013 0.10 0.05 K 0.903 1.10 1.00 K1 0.400 L 0.45 0.61 0.55 M 0.085 0.18 0.11 0 8 All Dimensions in mm April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR Package Outline Dimensions (All Dimensions in mm) 0.254 (3) Package Types: SO-8* E1 E A1 L Gauge Plane Seating Plane Detail `A' 7~9 h 45 A2 A A3 Detail `A' b e D TL431 *SO-8 is a future package Document number: DS35044 Rev. 6 - 2 13 of 14 www.diodes.com SO-8* Dim Min Max A 1.75 A1 0.10 0.20 A2 1.30 1.50 A3 0.15 0.25 b 0.3 0.5 D 4.85 4.95 E 5.90 6.10 E1 3.85 3.95 e 1.27 Typ h 0.35 L 0.62 0.82 0 8 All Dimensions in mm April 2012 (c) Diodes Incorporated TL431/TL432 ADJUSTABLE PRECISION SHUNT REGULATOR IMPORTANT NOTICE DIODES INCORPORATED MAKES NO WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, WITH REGARDS TO THIS DOCUMENT, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION). 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