XB431-TL – Voltage Reference – Xinluda

The Xinluda XB431-TL is a low-voltage, three-terminal adjustable precision shunt voltage reference (TL431-type) with a 1.24V internal reference, an adjustable 1.24V to 6V output, and a 0.25Ω typical output impedance in a compact SOT-23-3 package.

The Xinluda XB431-TL is a low-voltage, three-terminal adjustable precision shunt voltage reference belonging to the popular TL431-type family. Using two external resistors, its output voltage can be programmed to any value between the internal reference voltage (V_REF = 1.24V) and 6V, making it a versatile, low-voltage alternative to traditional shunt references. Its active output stage delivers a fast turn-on characteristic and a low typical output impedance of 0.25Ω, which makes it especially well suited as the reference element in the isolated feedback loop of 3V to 3.3V switching power supplies when paired with an optocoupler.

Key Features

• Three-terminal adjustable precision shunt voltage reference (TL431-type)
• Internal reference voltage (V_REF): 1.24V
• Adjustable output voltage range: 1.24V to 6V (set by two external resistors)
• Initial tolerance: 1% (at 25°C)
• Typical output impedance: 0.25Ω
• Typical cathode operating current: 80µA
• Typical reference voltage drift: 6mV over -40°C to +85°C
• Fast turn-on active output circuit
• Compact SOT-23-3 surface-mount package

Applications

• Isolated feedback reference for 3V to 3.3V switching power supplies (with optocoupler)
• Secondary-side regulation in flyback SMPS designs
• Adjustable / programmable voltage references
• Low-voltage error amplifiers
• Voltage monitoring and supervisory circuits
• Zener diode replacement

Why Source XB431-TL from Pacific Component Xchange

The Xinluda XB431-TL is a specialty, low-availability part with little to no authorized-distributor stock, which can make it difficult to source through conventional channels. Pacific Component Xchange is an independent distributor focused on hard-to-find and obsolete power-management ICs, voltage references, and optocouplers. We help engineers and procurement teams secure the components that mainstream catalogs cannot supply.

Every XB431-TL we source is screened for authenticity and traceability, and we ship worldwide to keep your production lines and prototyping schedules on track. Because this is a Request-For-Quote (RFQ) item, pricing is provided on a per-order basis to reflect current market conditions and quantity. Submit an RFQ to Pacific Component Xchange today for current availability, lead time, and a competitive quote on the XB431-TL.