Programmable Shunt Regulator LM431A, LM431B, LM431C Description The LM431A/LM431B/LM431C are three terminal output adjustable regulators with thermal stability over the full operating www.onsemi.com temperature range. The output voltage can be set to any value between V (approximately 2.5 V) and 36 V with two external resistors. REF These devices have a typical dynamic output impedance of 0.2 . Active output circuit provides a sharp turnon characteristic, making these devices excellent replacements for Zener diodes in many applications. Features 1 1 2 2 3 Programmable Output Voltage to 36 V 3 TO92 TO92 Low Dynamic Output Impedance: 0.2 (Typical) CASE 135AN CASE 135AR Sink Current Capability: 1.0 to 100 mA Equivalent FullRange Temperature Coefficient of 50 ppm/C MARKING DIAGRAM (Typical) Temperature Compensated for Operation Over Full Rated Operating Temperature Range LM431 XXXX Low Output Noise Voltage ALYW Fast Turnon Response LM431XXXX = Specific Device Code A = Assembly Location L = Wafer Lot YW = Assembly Start Week PIN CONNECTIONS Figure 1. Block Diagram 1 Ref 2 Anode 3 Cathode 12 3 12 3 ORDERING INFORMATION See detailed ordering and shipping information in the package dimensions section on page 6 of this data sheet. Semiconductor Components Industries, LLC, 2003 1 Publication Order Number: April, 2021 Rev. 3 LM431A/DLM431A, LM431B, LM431C ABSOLUTE MAXIMUM RATINGS Symbol Parameter Value Unit V Cathode Voltage 37 V KA I Cathode Current Range (Continuous) 100 to +150 mA KA I Reference Input Current Range 0.05 to +10 mA REF P Power Dissipation 770 mW D R Thermal Resistance, Junction to Ambient 160 C/W jA T Operating Temperature Range LM431xC 25 to +85 C OPR Operating Temperature Range LM431xI 40 to +85 C T Junction Temperature 150 C J T Storage Temperature Range 65 to +150 C STG Stresses exceeding those listed in the Maximum Ratings table may damage the device. If any of these limits are exceeded, device functionality should not be assumed, damage may occur and reliability may be affected. RECOMMENDED OPERATING CONDITIONS Symbol Parameter Min Max Unit V Cathode Voltage V 36 V KA REF I Cathode Current 1.0 100 mA KA Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond the Recommended Operating Ranges limits may affect device reliability. ELECTRICAL CHARACTERISTICS (Values are at T = 25C unless otherwise noted) A LM431A LM431B LM431C Symbol Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Unit V Reference Input V = V , I = 10 mA 2.450 2.500 2.550 2.470 2.495 2.520 2.482 2.495 2.508 V REF KA REF KA Voltage V / T Deviation of V = V , I =10 mA 4.5 17.0 4.5 17.0 4.5 17.0 mV REF KA REF KA Reference Input T T T (Note 1) MIN A MAX Voltage Over Temperature V / Ratio of Change in I = 10 mA V = 1.0 2.7 1.0 2.7 1.0 2.7 mV/V KA REF KA V Reference Input 10 VV KA REF Voltage to the V = 0.5 2.0 0.5 2.0 0.5 2.0 Change in Cathode KA 36 V10 V Voltage I Reference Input I = 10 mA, R1 = 10 k , 1.5 4.0 1.5 4.0 1.5 4.0 A REF KA Current R2 = Deviation of 0.4 1.2 0.4 1.2 0.4 1.2 I / T I = 10 mA, R1 = 10 k , A REF KA Reference Input R2 = , T = Full Range A Current Over Full Temperature Range I Minimum Cathode V = V 0.45 1.00 0.45 1.00 0.45 1.00 mA KA(MIN) KA REF Current for Regulation I Off Stage V = 36 V, V = 0 0.05 1.00 0.05 1.00 0.05 1.00 A KA(OFF) KA REF Cathode Current Dynamic V = V , I = 1 to 100 0.15 0.50 0.15 0.50 0.15 0.50 Z KA KA REF KA Impedance mA, f 1.0 kHz Product parametric performance is indicated in the Electrical Characteristics for the listed test conditions, unless otherwise noted. Product performance may not be indicated by the Electrical Characteristics if operated under different conditions. 1. LM431xC: T = 25C, T = +85C MIN MAX LM431xI: T = 40C, T = +85C MIN MAX www.onsemi.com 2