NXP Semiconductors BUK220-50Y,118

Overview

BUK220-50Y from NXP Semiconductors (formerly Philips) is a monolithic single-channel high-side power switch in TOPFET2 technology, designed for automotive and industrial load control. It delivers 6 A continuous load current, 50 V continuous off-state supply voltage, and 180 mΩ on-state resistance at 25 °C, with integrated overtemperature, short-circuit, and open-load diagnostics - used to drive lamps, motors, solenoids, and heaters in 12 V/24 V systems.

For engineers reviewing the BUK220-50Y datasheet, BUK220-50Y pinout, BUK220-50Y application, or BUK220-50Y equivalent, key selection criteria include its SOT426 package thermal resistance (2.5–3 K/W), diagnostic status output with open-drain logic, ISO-compliant 2 A nominal load rating, and built-in reverse-battery protection up to −32 V peak.

Technical Context

The BUK220-50Y integrates a vertical power TrenchMOS transistor with CMOS-compatible input logic, internal ground resistor (95–190 Ω), and autonomous protection circuits including latched short-circuit shutdown, undervoltage lockout (4.2 V threshold), and overvoltage shutdown (45 V threshold). Its status pin provides real-time fault reporting via open-drain output requiring external pull-up.

Switching behavior is characterized by 60–90 µs total turn-on/off times into 13 Ω resistive loads, with clamping energy handling of 75 mJ for inductive load turn-off. Thermal management relies on direct mounting-base conduction (R_{th j-mb} = 2.5–3 K/W), enabling operation up to 150 °C junction temperature.

Key Specifications

Pinout & Package

SOT426 surface-mount package (Philips D2-PAK variant), 5-pin plastic single-ended outline with centre pin (Pin 3) internally connected to the mounting base for low-thermal-resistance heat transfer. Mounting base serves as primary thermal path and electrical ground reference.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BTS4140N and VNQ5E025AJTR-E, the BUK220-50Y offers simpler integration for cost-sensitive automotive body electronics due to its internal ground resistor, fixed protection thresholds, and proven field reliability - without requiring firmware configuration or external current-limiting networks.

Availability

BUK220-50Y is available at Aetrix Electronics and suitable for automotive lighting control, industrial solenoid actuation, and HVAC damper management requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant sourcing.

Supply support for BUK220-50Y 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 focused on automotive, industrial, and IoT applications, delivering secure, energy-efficient, and highly integrated solutions.

The BUK220-50Y belongs to NXP's TOPFET family of intelligent high-side switches, engineered specifically for automotive body electronics and industrial control systems requiring robust protection, diagnostic capability, and simplified board-level design.

FAQ

What is the maximum continuous load current rating for the BUK220-50Y?

The BUK220-50Y supports 6 A continuous load current when the mounting base temperature remains ≤114 °C. At higher temperatures or with reduced copper area, derating applies per the thermal resistance specification (R_{th j-mb} = 2.5–3 K/W). The device also guarantees 2 A nominal load current per ISO 10483-1 for automotive lamp applications.

Does the BUK220-50Y require external components for reverse-battery protection?

The BUK220-50Y includes an internal ground resistor (95–190 Ω) that limits reverse-battery ground current, but external resistors (≥3.2 kΩ) are still required on the input and status pins to keep reverse currents within safe limits during −16 V continuous or −32 V peak reverse-battery events.

How does the status output of the BUK220-50Y indicate fault conditions?

The BUK220-50Y status pin is an open-drain output that pulls low during undervoltage, overvoltage, short-circuit, overtemperature, or open-circuit load conditions. It requires an external pull-up resistor (typically 47 kΩ) to V_CC; logic high indicates normal operation, while logic low signals active fault detection.

Can the BUK220-50Y drive inductive loads without external flyback diodes?

Yes - the BUK220-50Y integrates voltage clamping that limits negative load-to-ground voltage to −20 to −30 V during inductive turn-off (1 A, 300 µs), absorbing up to 75 mJ non-repetitive clamping energy. This eliminates the need for external flyback diodes in most solenoid and small-motor applications.

What is the input voltage threshold range for enabling the BUK220-50Y?

The BUK220-50Y has a CMOS-compatible input with turn-on threshold V_IG(ON) = 2.4–3.0 V and turn-off threshold V_IG(OFF) = 1.5–2.1 V, providing 0.3 V hysteresis. Input current remains ≤160 µA across the operating temperature range (−40 to +150 °C), ensuring compatibility with standard microcontroller GPIO outputs.