AS431 ADJUSTABLE PRECISION SHUNT REGULATORS Description Pin Assignments The AS431 is a three-terminal adjustable shunt regulator with guaranteed thermal stability over a full operation range. It features sharp turn-on characteristics, low temperature coefficient and low output impedance, which make it ideal substitute for Zener diode in applications such as switching power supply, charger and other adjustable regulators. (Top View) (Top View) ANODE 3 NC 1 * 2 CATHODE 3 (Note 4) The output voltage of AS431 can be set to any value between VREF (2.5V) and the corresponding maximum cathode voltage (36V). 1 2 REF The AS431 precision reference is offered in two voltage tolerance: 0.5% and 1.0%. This IC is available in 4 packages: TO92 (Ammo Packing), SOT23, SOT25 and SOT89. 5 ANODE 4 REF CATHODE SOT23 SOT25 Note 4: * Pin 2 is attached to substrate and must be connected to ANODE or open. (Top View) (Top View) Features Programmable Precise Output Voltage from 2.5V to 36V High Stability under Capacitive Load Low Temperature Deviation: 4.5mV Typical Low Equivalent Full-range 20PPM/C Typical Sink Current Capacity from 1mA to 100mA Low Output Noise Wide Operating Range of -40 to +125C Lead-Free Packages: SOT23, SOT25, TO92 (Ammo Packing), SOT89 Temperature Coefficient with 1 REF Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. "Green" Device (Note 3) Charger Voltage Adapter Switching Power Supply Graphic Card Precision Voltage Reference Notes: ANODE CATHODE 1 REF 2 3 ANODE CATHODE SOT89 (Option 2) (Top View) Lead-Free Packages, Available in "Green" Molding Compound: SOT23, SOT25, TO92 (Ammo Packing), SOT89 3 SOT89 (Option 1) Totally Lead-Free; RoHS Compliant (Notes 1 & 2) Applications 2 3 CATHODE 2 ANODE 1 REF TO92 (Ammo Packing) 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS), 2011/65/EU (RoHS 2) & 2015/863/EU (RoHS 3) compliant. 2. See https://www.diodes.com/quality/lead-free/ 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. AS431 Document number: DS36599 Rev. 4 - 2 1 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Typical Applications Circuit Shunt Regulator High Current Shunt Regulator Current Source or Current Limit AS431 Document number: DS36599 Rev. 4 - 2 2 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Typical Applications Circuit (Cont.) Precision 5V 1A Regulator PWM Converter with Reference AS431 Document number: DS36599 Rev. 4 - 2 3 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Functional Block Diagram Absolute Maximum Ratings (Note 5) Symbol Note 5: Parameter VKA Cathode Voltage IKA Cathode Current Range (Continuous) IREF Reference Input Current Range PD Power Dissipation TJ Junction Temperature Rating Unit 40 V -100 to 150 mA 10 mA Z, R Package 770 N, K Package 370 mW TSTG Storage Temperature Range ESD ESD (Human Body Model) +150 C -65 to +150 C 2000 V Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability. Recommended Operating Conditions Symbol Parameter Min Max Unit VKA Cathode Voltage VREF 36 V IKA Cathode Current 1.0 100 mA TA Operating Ambient Temperature Range -40 +125 C AS431 Document number: DS36599 Rev. 4 - 2 4 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Electrical Characteristics (Operating Conditions: TA = +25C, unless otherwise specified.) Symbol Parameter 0.5% VREF VREF VREF VKA Reference Voltage Test Circuit 4 Conditions Min Typ Max 2.487 2.500 2.512 2.475 2.500 2.525 0 to +70C -- 4.5 8 -40 to +85C -- 4.5 10 -40 to +125C -- 4.5 16 VKA = 10V to VREF -- -1.0 -2.7 VKA = 36V to 10V -- -0.5 -2.0 VKA = VREF, IKA = 10mA 1.0% Deviation of Reference Voltage Over Full Temperature Range 4 VKA = VREF, IKA = 10mA Unit V mV Ratio of Change in Reference Voltage to the Change in Cathode Voltage 5 IREF Reference Current 5 IKA = 10mA, R1 = 10k, R2 = -- 0.7 4 A IREF Deviation of Reference Current Over Full Temperature Range Minimum Cathode Current for Regulation 5 IKA = 10mA, R1 = 10k, R2 = , TA = -40 to +125C -- 0.4 1.2 A 4 VKA = VREF -- 0.4 1.0 mA Off-state Cathode Current 6 VKA = 36V, VREF = 0 -- 0.05 1.0 A Dynamic Impedance 4 VKA = VREF, IKA = 1 to 100mA, f 1.0kHz -- 0.15 0.5 SOT23 -- 135.9 -- SOT25 -- 135.9 -- TO92 (Ammo Packing) -- 81.9 -- SOT89 -- 29.8 -- IKA (Min) IKA (Off) ZKA JC Thermal Resistance AS431 Document number: DS36599 Rev. 4 - 2 -- IKA = 10mA 5 of 20 www.diodes.com mV/V C/W May 2018 (c) Diodes Incorporated AS431 Electrical Characteristics (Cont.) Test Circuit 4 for VKA = VREF Test Circuit 5 for VKA > VREF Test Circuit 6 for IOFF AS431 Document number: DS36599 Rev. 4 - 2 6 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Performance Characteristics Reference Voltage vs. Ambient Temperature Reference Current vs. Ambient Temperature 2.510 1.5 VKA = VREF IKA = 10mA R1=10K,R2=Infinite IKA=10mA Reference Current (A) Reference Voltage (V) 2.505 2.500 2.495 1.0 0.5 2.490 2.485 -60 -40 -20 0 20 40 60 80 100 120 0.0 -60 140 -40 -20 0 o 60 80 100 120 140 Cathode Current vs. Cathode Voltage 800 VKA=VREF VKA=VREF 0 0 TA=25 C TA=25 C 600 100 Cathode Current (A) Cathode Current (mA) 40 Ambient Temperature ( C) Cathode Current vs. Cathode Voltage 150 20 0 Ambient Temperature ( C) 50 0 400 200 0 -50 -200 -100 -2 -1 0 1 2 3 -1.0 -0.5 0.0 Cathode Voltage (V) 0.5 1.0 1.5 2.0 2.5 Cathode Voltage (V) Off-State Cathode Current vs. Ambient Temperature Ratio of Delta Reference Voltage to the Ratio of Delta Cathode Voltage 2.0 -0.9 VKA=36V VREF=0 1.6 VKA=3.5V to 36V -1.0 1.4 VREF / VKA (mV/V) Off-State Cathode Current (A) 1.8 1.2 1.0 0.8 0.6 0.4 -1.1 -1.2 -1.3 0.2 -1.4 0.0 -40 -20 0 20 40 60 80 100 -40 120 o AS431 Document number: DS36599 Rev. 4 - 2 -20 0 20 40 60 80 100 120 o Ambient Temperature ( C) Ambient Temperature ( C) 7 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Performance Characteristics (Cont.) Small Signal Voltage Gain vs. Frequency 70 0 60 TA=25 C IKA=10mA Voltage Gain (dB) 50 40 30 20 10 0 -10 1k 10k 100k 1M Small Signal Frequency (Hz) Reference Impedance vs. Frequency IKA=10mA Reference Impedance () o 10 TA=25 C 1 0.1 1K 10K 100K 1,000K Frequency (Hz) Stability Boundary Conditions vs. Load Capacitance 100 90 Cathode Current (mA) 80 70 60 Stable Stable 50 o TA=25 C VKA=VREF VKA= 5V:No oscillation VKA=10V:No oscillation VKA=15V:No oscillation 40 30 20 10 0 0.001 0.01 0.1 1 10 Load Capacitance (F) AS431 Document number: DS36599 Rev. 4 - 2 8 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Performance Characteristics (Cont.) Pulse Response of Input and Output Voltage 5 Input and Output Voltage (V) Input 4 3 Output 2 1 0 0 2 4 6 Time (S) AS431 Document number: DS36599 Rev. 4 - 2 9 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Ordering Information AS431 X X X - X Product Name Package Voltage Tolerance A : 0.5% B : 1.0% Pb Lead-Free Pb Lead-Free Pb Lead-Free Pb Lead-Free Pb N : SOT23 K : SOT25 R : SOT89 Z : TO92 (Ammo Packing) Part Number Voltage Tolerance Package (Note 7) RoHS Compliant Lead Free / Green AS431ANTRE1 0.5% SOT23 Lead Free AS431BNTRE1 1.0% SOT23 AS431ANTRG1 0.5% AS431BNTRG1 Pb Pb Pb TR : Tape & Reel or Ammo E1 : RoHS Compliant G1 : RoHS Compliant and Green Quantity Status (Note 6) Alternative EB5 Tape & Reel 3000 NRND AS431ANTR -G1 Lead Free EB6 Tape & Reel 3000 NRND AS431BNTR -G1 SOT23 Green GB5 Tape & Reel 3000 In Production -- 1.0% SOT23 Green GB6 Tape & Reel 3000 In Production -- AS431AKTRE1 0.5% SOT25 Lead Free E6H Tape & Reel 3000 NRND AS431AKTR -G1 AS431BKTRE1 1.0% SOT25 Lead Free E6I Tape & Reel 3000 NRND AS431BKTR -G1 AS431AKTRG1 0.5% SOT25 Green G6H Tape & Reel 3000 In Production -- AS431BKTRG1 1.0% SOT25 Green G6I Tape & Reel 3000 In Production -- AS431AZ-E1 0.5% TO92 Lead Free AS431AZE1 Bulk 1000 End of Life AS431AZTR -E1 AS431AZTRE1 0.5% TO92 Lead Free AS431AZE1 Ammo 2000 In Production -- AS431BZ-E1 1.0% TO92 Lead Free AS431BZE1 Bulk 1000 End of Life AS431BZTR -E1 AS431BZTRE1 1.0% TO92 Lead Free AS431BZE1 Ammo 2000 In Production -- AS431AZ-G1 0.5% TO92 Green AS431AZG1 Bulk 1000 End of Life AS431AZTR -G1 AS431AZTRG1 0.5% TO92 Green AS431AZG1 Ammo 2000 In Production -- AS431BZ-G1 1.0% TO92 Green AS431BZG1 Bulk 1000 End of Life AS431BZTR -G1 AS431BZTRG1 1.0% TO92 Green AS431BZG1 Ammo 2000 In Production -- Lead-Free Lead-Free E1/G1 Packing Lead-Free Lead-Free Packing AS431 Document number: DS36599 Rev. 4 - 2 Marking ID 10 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Ordering Information (Cont.) Pb Lead-Free Pb Lead-Free Notes: Part Number Voltage Tolerance Package (Note 7) RoHS Compliant Lead Free / Green AS431ARTRE1 0.5% SOT89 Lead Free AS431BRTRE1 1.0% SOT89 AS431ARTRG1 0.5% AS431BRTRG1 1.0% Packing Quantity Status (Note 6) Alternative E43G Tape & Reel 1000 NRND AS431ARTR -G1 Lead Free E43H Tape & Reel 1000 NRND AS431BRTR -G1 SOT89 Green G43G Tape & Reel 1000 In Production -- SOT89 Green G43H Tape & Reel 1000 In Production -- Marking ID 6. All variants with TO92 package in Bulk packing (AS431AZ-E1, AS431BZ-E1, AS431AZ-G1 and AS431BZ-G1) are End of Life, recommended alternatives are the variants with the same package in Ammo packing. NRND: Not Recommended for New Design. 7. For packaging details, go to our website at: https://www.diodes.com/design/support/packaging/diodes-packaging/. Marking Information (1) TO92 (Ammo Packing) (Front View) AS431 XZ-XX YWWAXX AS431 Document number: DS36599 Rev. 4 - 2 First and Second Lines: Logo and Marking ID (See Ordering Information) Third Line: Date Code Y: Year WW: Work Week of Molding A: Assembly House Code XX: Internal Code 11 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Marking Information (Cont.) (2) SOT23 (Top View) 3 : Logo XXX: Marking ID (See Ordering Information) XXX 1 (3) 2 SOT89 (Top View) XXXX YWWAXX XXXX YWWAXX 1 (4) 2 First Line: Logo and Marking ID (See Ordering Information) Second Line: Date Code Y: Year WW: Work Week of Molding A: Assembly House Code XX: Internal Code 1 3 2 3 SOT25 (Top View) XXX AS431 Document number: DS36599 Rev. 4 - 2 : Logo XXX: Marking ID (See Ordering Information) 12 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Package Outline Dimensions (All dimensions in mm(inch).) (1) Package Type: TO92 (Ammo Packing) 1. 100(0. 043) 1.270(0. 050) Typ 3. 430(0.135) MIN 3.800(0.150) 2.500(0. 098) 4.000 (0.157 ) 0.000(0.000) 0.380(0.015) 1. 600(0. 063) MAX 14.500(0.571) 0. 320(0. 013) 0. 510(0. 020) 12.500(0.492) 3.300(0.130) 1. 400(0. 055) 4.700(0.185) 4.300(0.169) 4.400(0. 173) 4.800 (0.189 ) 13.000(0. 512) 15.000 (0.591 ) 0.380(0.015) 0.550(0.022 ) 2.540(0.100) Typ AS431 Document number: DS36599 Rev. 4 - 2 13 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Package Outline Dimensions (Cont. All dimensions in mm(inch).) (2) Package Type: SOT23 3.0 7.0 0.500(0.020) 0.700(0.028) 2.0 1.050(0.041)REF 0.0~10.0 0.010(0.0004) 0.100(0.004) 0.200(0.008)MIN Document number: DS36599 Rev. 4 - 2 7.0 0.080(0.003) 0.180(0.007) 0.550(0.022)REF 1.200(0.047) 1.400(0.055) 2.300(0.091) 2.500(0.098) AS431 R0.100(0.004) 0.900(0.035) 1.100(0.043) 2.800(0.110) 3.000(0.118) 0.890(0.035) 1.030(0.041) 0.100(0.004) GAUGE PLANE 4xR0.100(0.004) 0.300(0.012) 0.510(0.020) 1.900(0.075)REF 14 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Package Outline Dimensions (Cont. All dimensions in mm(inch).) (3) Package Type: SOT25 0.300(0.012) 0.600(0.024) 0.100(0.004) 0.200(0.008) 1.500(0.059) 1.700(0.067) 3.000(0.118) 2.650(0.104) 2.820(0.111) 3.100(0.122) 0.200(0.008) 0.700(0.028) REF 0.300(0.012) 0.500(0.020) 0 8 1.800(0.071) 2.000(0.079) 0.000(0.000) MAX 1.450(0.057) 0.950(0.037) TYP 0.150(0.006) 0.900(0.035) 1.300(0.051) AS431 Document number: DS36599 Rev. 4 - 2 15 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Package Outline Dimensions (Cont. All dimensions in mm(inch).) (4) Package Type: SOT89 1.400(0.055) 1.600(0.063) 4.400(0.173) 4.600(0.181) Option 1 2.300(0.091) 2.600(0.102) 3.950(0.156) 4.250(0.167) 2.060(0.081)REF 3 0.900(0.035) 1.200(0.047) 0.350(0.014) 0.450(0.018) 0.320(0.013) 0.540(0.021) 0.480(0.019) 0.620(0.024) 0.320(0.013) 0.540(0.021) 3.000(0.118) TYP 10 3 R0.150(0.006) 10 Option 1 Option 2 1.550(0.061)REF 1.030(0.041)REF R 0.200(0.008) 0.320(0.013)REF 45 AS431 Document number: DS36599 Rev. 4 - 2 2.630(0.104) 2.930(0.115) 1.620(0.064)REF 2.210(0.087)REF 1.500(0.059) 1.620(0.064) 1.800(0.071) 1.830(0.072) 16 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Suggested Pad Layout (1) Package Type: SOT23 Grid placement courtyard Y Z G Y X E Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) E (mm)/(inch) Value 2.900/0.114 1.100/0.043 0.800/0.031 0.900/0.035 0.950/0.037 AS431 Document number: DS36599 Rev. 4 - 2 17 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Suggested Pad Layout (Cont.) (2) Package Type: SOT25 E2 G Z E1 Y X Dimensions Z (mm)/(inch) G (mm)/(inch) X (mm)/(inch) Y (mm)/(inch) E1 (mm)/(inch) E2 (mm)/(inch) Value 3.600/0.142 1.600/0.063 0.700/0.028 1.000/0.039 0.950/0.037 1.900/0.075 AS431 Document number: DS36599 Rev. 4 - 2 18 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 Suggested Pad Layout (Cont.) (3) Package Type: SOT89 X1 Z X2 Y1 Y E X Dimensi ons Z (mm)/(inch) X (mm)/(inch) X1 (mm)/(inch) X2 (mm)/(inch) Y (mm)/(inch) Y1 (mm)/(inch) E (mm)/(inch) Value 4.600/0.181 0.550/0.022 1.850/0.073 0.800/0.031 1.300/0.051 1.475/0.058 1.500/0.059 AS431 Document number: DS36599 Rev. 4 - 2 19 of 20 www.diodes.com May 2018 (c) Diodes Incorporated AS431 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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Copyright (c) 2018, Diodes Incorporated www.diodes.com AS431 Document number: DS36599 Rev. 4 - 2 20 of 20 www.diodes.com May 2018 (c) Diodes Incorporated Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Diodes Incorporated: AS431BNTR-G1 AS431ANTR-E1 AS431BNTR-E1 AS431ANTR-G1 AS431AZTR-E1 AS431BZTR-G1 AS431AZTR-G1 AS431BRTR-E1 AS431BKTR-G1 AS431BRTR-G1 AS431ARTR-G1 AS431BZTR-E1