TL431ACDBZR

Part: TL431ACDBZR (TL431A, C grade, DBZ SOT-23-3 package) — Texas Instruments

Type: Adjustable Precision Shunt Regulator / Programmable Voltage Reference

Description: Three-terminal adjustable shunt regulator with 1% initial tolerance (A grade), 2.495 V typical reference, output programmable from Vref to 36 V, 1–100 mA sink capability and 0.2 Ω typical dynamic impedance.

Operating Conditions:

• Cathode voltage (VKA): Vref to 36 V
• Cathode current (IKA): 1 to 100 mA
• Operating temperature (C grade): 0 to 70 °C

Absolute Maximum Ratings:

• Cathode voltage VKA: 37 V
• Continuous cathode current IKA: −100 to 150 mA
• Reference input current: −0.05 to 10 mA
• Operating virtual junction temperature TJ: 150 °C
• Storage temperature: −65 to 150 °C

Key Specs:

• Reference voltage Vref (VKA = Vref, IKA = 10 mA, 25 °C): 2470 / 2495 / 2520 mV (min/typ/max)
• Vref deviation over temperature VI(dev): SOT-23-3 and TL432 devices 6 mV typ, 16 mV max; all other devices 4 mV typ, 25 mV max
• Ratio of Vref change to cathode voltage change (IKA = 10 mA): −1.4 mV/V typ, −2.7 mV/V max (ΔVKA = 10 V − Vref); −1 mV/V typ, −2 mV/V max (ΔVKA = 36 V − 10 V)
• Reference input current Iref (IKA = 10 mA, R1 = 10 kΩ, R2 = ∞): 2 μA typ, 4 μA max
• Iref deviation over temperature: 0.8 μA typ, 1.2 μA max
• Minimum cathode current for regulation Imin: 0.4 mA typ, 0.6 mA max
• Off-state cathode current Ioff (VKA = 36 V, Vref = 0): 0.1 μA typ, 0.5 μA max
• Dynamic impedance |zKA| (VKA = Vref, f ≤ 1 kHz, IKA = 1–100 mA): 0.2 Ω typ, 0.5 Ω max
• Thermal resistance RθJA (DBZ, 3-pin): 206 °C/W

Features:

• Reference voltage tolerance at 25 °C: 0.5% (B grade), 1% (A grade), 2% (standard)
• Adjustable output voltage: Vref to 36 V
• Low output noise
• 0.2 Ω typical output impedance
• Sink current capability 1 mA to 100 mA
• Typical temperature drift (TL43xB): 6 mV (C temperature grade)
• ESD: HBM ±2000 V, CDM ±1000 V

Applications:

• Adjustable voltage and current references
• Secondary-side regulation in flyback SMPS
• Zener diode replacement
• Voltage monitoring
• Comparator with integrated reference

Package:

• SOT-23-3 (DBZ), 2.90 mm × 1.30 mm nominal (this part)
• Other TL43x packages: SOT-23-5 (DBV), SOIC-8, PDIP-8, SOP-8