NXP Semiconductors UBA2024T/N1,518

Overview

UBA2024T/N1,518 from NXP Semiconductors is a monolithic high-voltage half-bridge power IC designed for compact fluorescent lamp (CFL) electronic ballasts operating from 230 V mains. It integrates dual MOSFETs (R_DS(on) = 9.7 Ω HS / 8.5 Ω LS), an adjustable internal oscillator (41.32 kHz typ), and a high-voltage level shifter rated to 550 V. The device delivers precise 50 % duty cycle via internal divide-by-2 logic and supports up to 23 W lamp loads in self-ballasted CFL designs.

For engineers reviewing the UBA2024T/N1,518 datasheet, UBA2024T/N1,518 pinout, UBA2024T/N1,518 application, or UBA2024T/N1,518 equivalent, this page provides verified functional identity, SO14 package mapping, confirmed sweep-mode preheat timing (0.35 s typ), validated thermal resistance (95 K/W), and two documented alternative part numbers with explicit parameter-level differences.

Technical Context

The UBA2024T/N1,518 implements a self-oscillating 555-timer-based architecture with external R_OSC/C_OSC tuning, where the oscillator output is divided by two to ensure exact 50 % bridge duty cycle. Its integrated bootstrap diode and high-voltage level shifter enable direct gate drive of the floating high-side MOSFET up to 550 V.

Start-up initiates from HV pin voltage rise, charging VDD and FS capacitors while holding low-side transistor on; sweep mode then ramps oscillator frequency from 2.5× nominal down to resonance-enabling controlled filament preheat and reliable lamp ignition without external controllers.

Key Specifications

Pinout & Package

UBA2024T/N1,518 uses the SO14 plastic small outline package (SOT108-1), 14-lead, 3.9 mm body width, with gull-wing leads and pin 1 index marking.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar half-bridge CFL driver applications.

Compared with UBA2024T/N1,518, the UBA2024AT offers lower on-resistance for improved thermal performance at higher power, while the UBA2024P provides identical functionality in a through-hole package - enabling layout reuse only where SO14 surface-mount constraints are not applicable.

Availability

UBA2024T/N1,518 is available at Aetrix Electronics and suitable for compact fluorescent lamp ballasts, 230 V mains-powered lighting systems, and energy-efficient lighting retrofit programs requiring stable component supply and long-term lifecycle support.

Supply support for UBA2024T/N1,518 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and lighting applications.

The UBA2024 product line was engineered specifically for integrated electronic CFL ballasts - delivering monolithic half-bridge control with built-in preheat, ignition, and regulation to replace multi-component discrete solutions.

FAQ

What is the maximum lamp power supported by the UBA2024T/N1,518?

The UBA2024T/N1,518 is rated for half-bridge configured loads up to 23 W, provided the maximum junction temperature of +150 °C is not exceeded. This rating is validated under standard thermal conditions with SO14 package R_th(j-a) = 95 K/W and appropriate heatsinking in CFL ballast enclosures.

Does the UBA2024T/N1,518 require an external low-voltage supply?

No, the UBA2024T/N1,518 derives its internal low-voltage supply (VDD = 12.5 V typical) directly from the HV pin connected to rectified mains. No external DC supply is needed - the IC integrates a charge pump and regulator to generate VDD and FS voltages autonomously.

How is the oscillator frequency set for the UBA2024T/N1,518?

The oscillator frequency of the UBA2024T/N1,518 is set externally using resistor ROSC and capacitor COSC on the RC pin. With ROSC = 100 kΩ and COSC = 220 pF, the nominal frequency is 41.32 kHz. The internal divide-by-2 circuit halves this to produce the final 50 % duty cycle bridge output frequency.

What is the purpose of the SW pin on the UBA2024T/N1,518?

Pin SW on the UBA2024T/N1,518 controls the sweep-mode preheat duration. An external capacitor (CSW) connected to SW is charged by a 280 nA internal current source; the resulting voltage ramp determines the time spent in sweep mode before transitioning to steady-state oscillation - typically 0.35 s with 33 nF.

Is the UBA2024T/N1,518 pin-compatible with other members of the UBA2024 family?

Yes, all UBA2024 family members - including UBA2024T/N1,518, UBA2024AT, and UBA2024BT - are pin-to-pin compatible within the same package type. The SO14 variants share identical pinout, allowing a single PCB layout to support multiple power grades and mains voltage versions.