XB431-LM – Adjustable Precision Shunt Voltage Reference – Xinluda

The XB431-LM from Xinluda is an adjustable precision shunt voltage reference (TL431-type) with a 1.24 V bandgap reference programmable up to 30 V, housed in a compact SOT-23-3 package.

The XB431-LM is a three-terminal adjustable precision shunt voltage reference manufactured by Xinluda Information Technology Co., Ltd. Functionally compatible with the industry-standard TL431 family, the device provides a stable 1.24 V bandgap reference that can be programmed to any cathode voltage between 1.24 V and 30 V using two external resistors. Internal negative feedback from the cathode to the ADJUST (reference) pin holds the programmed output, much like a non-inverting amplifier, making the XB431-LM a versatile building block for regulation, monitoring, and error-amplifier circuits.

With a tight 1.0% initial tolerance, low 55 µA operating current, and a low 0.25 Ω dynamic output impedance, the XB431-LM is well suited to space-constrained power and feedback designs. The SOT-23-3 surface-mount package and -40 °C to +85 °C operating range make it a practical drop-in shunt reference for consumer, industrial, and embedded power supplies.

Key Features

• Adjustable precision shunt voltage reference (TL431-type architecture)
• 1.24 V internal bandgap reference, programmable cathode voltage from 1.24 V to 30 V
• 1.0% initial tolerance
• Low operating (quiescent) current of 55 µA
• Low dynamic output impedance of 0.25 Ω
• Operating temperature range of -40 °C to +85 °C
• Compact SOT-23-3 surface-mount package

Applications

• Shunt and series voltage regulators
• Error amplifier in switching-mode and off-line power supplies
• Adjustable / programmable voltage reference circuits
• Voltage detection and monitoring
• Low-dropout (LDO) regulator bypass and feedback networks
• Constant-current source circuits

Why Source XB431-LM from Pacific Component Xchange

The XB431-LM is a hard-to-find part with limited authorized-distributor coverage in Western markets. Pacific Component Xchange is an independent distributor specializing in scarce power-management ICs and voltage references like the XB431-LM. We help engineers and buyers secure obsolete, allocated, and low-availability components through verified global supply channels.

Every order is backed by our authenticity and quality assurance program, with inspection and traceability to protect your build against counterfeit risk. We ship worldwide and can support both prototype quantities and production volumes. Because this is a Request-for-Quote item, pricing and lead time are confirmed per order. Submit an RFQ to Pacific Component Xchange today for current availability and a competitive quote on the XB431-LM.