NXP Semiconductors BUK217-50YT,118

Overview

BUK217-50YT from NXP Semiconductors (formerly Philips) is a monolithic single-channel high-side power switch in TOPFET2 technology, rated for 50 V continuous off-state supply voltage, 10 A continuous load current, and 14 mΩ on-state resistance at 25 °C. It integrates vertical TrenchMOS, CMOS-compatible input logic, latched overtemperature protection, and diagnostic status indication - deployed in automotive body control modules for lamp and solenoid driving.

For engineers reviewing the BUK217-50YT datasheet, BUK217-50YT pinout, BUK217-50YT application, or BUK217-50YT equivalent, key selection criteria include its 50 V V_BG rating, 10 A I_L capability, integrated reverse-battery and transient protection, open-drain status output with clamping, and SOT426 thermal performance with R_{th j-mb} ≤ 1.08 K/W.

Technical Context

The BUK217-50YT implements a protected high-side switching architecture with internal ground resistor (R_G = 95–190 Ω), enabling reverse-battery tolerance up to −32 V when external current-limiting resistors are used. Its control logic includes undervoltage lockout (V_BG(UV) = 4.2 V typ.) and overvoltage shutdown (V_BG(OV) = 45 V typ.) with hysteresis.

Protection functions operate autonomously: short-circuit detection triggers status-low assertion at V_BL(TO) = 10 V (typ., V_BG = 16 V); overtemperature latches at T_j(TO) = 170 °C (typ.), requiring input toggle to reset. Load current limiting activates at I_L(lim) = 15 A (typ.) above 9 V supply.

Key Specifications

Pinout & Package

SOT426 surface-mount package (Philips D2-PAK variant), 5-pin plastic single-ended outline with centre pin connected to mounting base for thermal and electrical grounding. Mounting base serves as primary thermal path and internal ground reference.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BUK217-50YT, BTS50085-1TAD offers enhanced diagnostics but increases system complexity, while NCV8460ASTT3G reduces cost and feature count at the expense of fault visibility - BUK217-50YT balances integrated protection, status feedback, and thermal performance in legacy-compliant automotive designs.

Availability

BUK217-50YT is available at Aetrix Electronics and suitable for automotive lighting control, engine bay solenoid actuation, and industrial heater sequencing requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for BUK217-50YT 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 secure connectivity solutions for automotive, industrial, and IoT applications, with roots in Philips' pioneering analog and power IC development.

The BUK217-50YT belongs to NXP's TOPFET family of intelligent high-side switches, designed specifically for robust, diagnostic-capable power distribution in harsh automotive environments - emphasizing protection integrity, thermal resilience, and system-level fault transparency.

FAQ

What is the maximum continuous load current supported by the BUK217-50YT?

The BUK217-50YT supports a continuous load current of 10 A under conditions where the mounting base temperature (T_mb) does not exceed 140 °C. This rating assumes proper PCB thermal design using the SOT426 mounting base as the primary heat path. At elevated junction temperatures (e.g., 150 °C), the device applies current limiting to protect itself, reducing effective current capability.

Does the BUK217-50YT require external components for basic operation?

Yes - the BUK217-50YT requires an external pull-up resistor (typically 47 kΩ) on the Status pin to enable fault reporting, and external current-limiting resistors on Input and Status pins are mandatory for reverse-battery operation (−16 V continuous, −32 V peak). No external flyback diode is needed due to integrated inductive clamping.

How does the BUK217-50YT indicate a short-circuit condition?

The BUK217-50YT asserts a logic-low signal on its open-drain Status pin when a short circuit is detected - identified by V_BL falling below 10 V (typ.) at V_BG = 16 V. This occurs before latching overtemperature shutdown, allowing upstream controllers to respond preemptively. The status remains low until the fault clears and the input is toggled.

What is the thermal resistance from junction to mounting base for the BUK217-50YT?

The BUK217-50YT has a maximum junction-to-mounting-base thermal resistance (R_{th j-mb}) of 1.08 K/W, measured under standard test conditions. This value enables accurate thermal modeling when the mounting base is soldered to a large copper area or heatsink - critical for sustaining 10 A loads in ambient temperatures up to 85 °C.

Can the BUK217-50YT be used in 24 V commercial vehicle applications?

Yes - the BUK217-50YT is rated for 50 V continuous off-state supply voltage and withstands load-dump transients up to 50 V, making it suitable for 24 V nominal systems. Its reverse-battery tolerance (−32 V peak) and operating range (5.5–35 V) align with ISO 16750-2 requirements for commercial vehicles when used with recommended external resistors.