NXP Semiconductors BUK215-50Y,118

Overview

BUK215-50Y from NXP Semiconductors (formerly Philips) is a monolithic single-channel high-side power switch in TOPFET2 technology, housed in an SOT426 surface-mount package. It delivers 9 A nominal load current (ISO), 20 A continuous load current, and 38 mΩ on-state resistance at 25°C, with integrated overtemperature, short-circuit, and open-load diagnostics for automotive-grade lamp, motor, and solenoid control.

For engineers reviewing the BUK215-50Y datasheet, BUK215-50Y pinout, BUK215-50Y application, or BUK215-50Y equivalent, key selection criteria include its 50 V continuous off-state supply voltage, latched fault protection, diagnostic status output, and compatibility with 5.5–35 V battery supplies in harsh automotive environments.

Technical Context

The BUK215-50Y integrates a vertical power TrenchMOS transistor with CMOS-compatible logic input, internal ground resistor (150 Ω typical), and open-drain status output requiring external pull-up. Its protection architecture includes undervoltage lockout (4.2 V threshold), overvoltage shutdown (45 V threshold), and temperature-dependent current limiting (45 A typical at 25°C).

Switching behavior is characterized by 140 µs typical turn-on time and 85 µs turn-off time into a 13 Ω resistive load, with clamping energy handling up to 150 mJ for inductive load turn-off. The device supports open-circuit detection via low-current threshold (0.8 A typical) with 0.16 A hysteresis.

Key Specifications

Pinout & Package

Package: SOT426 - Plastic surface-mount package with 5 leads (center pin connected to mounting base); dimensions 15.8 × 10.3 × 4.5 mm; thermal resistance R_{th j-mb} = 1.52–1.86 K/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-side switch applications.

Compared with BUK215-50Y, the BTS4140N offers superior conduction efficiency but demands additional protection components, while the NCV8450A sacrifices current capacity and fault resilience for integration simplicity in non-critical subsystems.

Availability

BUK215-50Y is available at Aetrix Electronics and suitable for automotive lamp control, engine cooling fan drive, transmission solenoid interface, and heated seat element control requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for BUK215-50Y 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 leader specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The BUK215-50Y belongs to NXP's TOPFET family of intelligent high-side switches, designed specifically for automotive power distribution and load management with integrated diagnostics and protection.

FAQ

What is the maximum continuous load current rating for the BUK215-50Y?

The BUK215-50Y supports a continuous load current of 20 A when the mounting base temperature remains at or below 95°C. This rating assumes adequate PCB copper area for thermal dissipation and accounts for the device's thermal resistance of 1.52–1.86 K/W from junction to mounting base. At higher ambient or board temperatures, derating is required per the datasheet's R_ON vs. T_j curves.

Does the BUK215-50Y provide reverse battery protection?

Yes, the BUK215-50Y provides reverse battery protection with a continuous reverse voltage rating of −16 V and a peak reverse voltage rating of −32 V. This is enabled by its internal ground resistor (95–190 Ω), which limits reverse current paths. External input and status resistors (≥3.2 kΩ) are required to keep reverse currents within safe limits during reverse connection events.

How does the status output of the BUK215-50Y indicate fault conditions?

The BUK215-50Y status pin is an open-drain output that pulls low during detected faults including short circuit, overtemperature, undervoltage, overvoltage, or open-circuit load. With a 47 kΩ external pull-up resistor to V_CC, it delivers a logic-high signal during normal operation and logic-low during any active fault condition. The status remains latched low after short-circuit trip until the input is toggled low and then high again.

What is the purpose of the internal ground resistor in the BUK215-50Y?

The internal ground resistor (150 Ω typical) in the BUK215-50Y serves two primary functions: it limits reverse battery current during polarity reversal, and it establishes a defined ground reference for internal protection circuitry. This resistor connects Pin 1 (Ground) to the mounting base (Pin 3), enabling reliable thermal conduction while eliminating the need for an external ground sense resistor in most automotive implementations.

Can the BUK215-50Y be used in 24 V commercial vehicle applications?

Yes, the BUK215-50Y is rated for a continuous supply voltage of 50 V and operates across a 5.5–35 V range, making it suitable for 24 V commercial vehicle systems. Its overvoltage shutdown triggers at 45 V (typical), providing margin against 24 V load-dump transients. Thermal performance must be verified for the specific PCB layout, as power dissipation at 24 V/20 A exceeds that at 12 V due to higher I²R losses.