XB402U-L27 – Linear LED Driver – Xinluda

About this part

The XB402U-L27 from Xinluda Information Technology Co., Ltd is a compact linear constant-current LED driver IC supplied in a space-saving SC74-6 (SOT-457) surface-mount package. Designed as a simple, low-cost alternative to resistor biasing, it provides a well-controlled drive current for low-power LEDs without an inductor or switching node, making it well suited to indicator, signage, and decorative lighting designs that demand minimal external components and low EMI.

Because it operates linearly, the XB402U-L27 keeps the bill of materials lean while delivering homogeneous light output despite varying LED forward voltages, voltage drops across long supply lines, and supply-voltage variations. The drive current is preset to 20 mA and can be adjusted up to 65 mA with a single external resistor, and multiple drivers can be paralleled to increase current. A negative thermal coefficient of -0.2 %/K reduces output current at higher temperatures, helping extend LED lifetime.

Key Features

• Linear constant-current LED driver topology (no inductor required)
• LED drive current preset to 20 mA
• Output current adjustable up to 65 mA with an external resistor
• Easy paralleling of drivers to increase current
• Supply voltage up to 40 V
• High current accuracy across supply-voltage variation
• Low voltage overhead of 1.4 V
• Up to 750 mW power dissipation in the small SC74 package
• Negative thermal coefficient of -0.2 %/K reduces output current at higher temperatures
• Operating (storage) temperature range -40 C to +85 C
• RoHS-compliant (Pb-free) package

Applications

• Channel letters for advertising and LED strips for decorative lighting
• Aircraft, train, and ship illumination
• Retrofits for general lighting and white goods (e.g. refrigerator lighting)
• Medical lighting
• Automotive lighting such as CHMSL and rear combination lights

Why Source XB402U-L27 from Pacific Component Xchange

The XB402U-L27 is a hard-to-find part with little to no authorized-distributor stock, which can stall production for buyers who need it. Pacific Component Xchange specializes in sourcing scarce, allocated, and obsolete power-management and LED-driver ICs like this one. Request a quote (RFQ) and our team will hunt down verified inventory, confirm authenticity through inspection and traceability, and ship globally to keep your line running. Whether you need a single reel or volume quantities of the XB402U-L27, contact Pacific Component Xchange for current availability and pricing.