NXP Semiconductors BUK1M200-50SDLD,51

Overview

BUK1M200-50SDLD from NXP Semiconductors (formerly Philips) is a quad-channel low-side logic-level power MOSFET switch with integrated temperature and overload protection in TOPFET™ technology. It delivers 50 V drain-source voltage rating, ≤200 mΩ R_DS(on) at 25 °C, 9.4 W total power dissipation, and operates up to 150 °C junction temperature - designed for driving lamps, solenoids, and DC motors in industrial control modules.

For engineers reviewing the BUK1M200-50SDLD datasheet, BUK1M200-50SDLD pinout, BUK1M200-50SDLD application, or BUK1M200-50SDLD equivalent, key selection considerations include its four independent protected channels, 5 V logic-compatible inputs, latch-reset input-source voltage threshold (1.5–2.9 V), and SO20 (SOT163-1) surface-mount package with thermal resistance of 13.3 K/W when all channels are active.

Technical Context

The BUK1M200-50SDLD integrates four identical low-side TOPFET™ channels, each featuring internal gate drive, current limiting, overtemperature sensing, and overvoltage clamping circuitry. Protection functions operate autonomously per channel using input-supplied bias and reset via input-source voltage reduction below 2.9 V.

Each channel implements crowbar-based short-circuit response (typ. 1.6 ms trip time), drain-current limiting (0.8–1.7 A), and thermal shutdown at 150–165 °C. The device uses TrenchMOS™ die architecture and draws only 100–400 µA input current at 4–5 V, enabling direct microcontroller interfacing without external level-shifting or buffering.

Key Specifications

Pinout & Package

Package: SOT163-1 (SO20), 20-pin plastic small-outline surface-mount package, 7.5 mm body width, 13.0 mm × 7.6 mm footprint, with solder-point thermal interface optimized for PCB heat spreading.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STSPIN250TR and TPS27082LDR, the BUK1M200-50SDLD uniquely combines quad-channel integration, autonomous overvoltage clamping, and input-driven latch reset - making it optimal for space-constrained industrial modules needing self-protecting, software-recoverable switching without auxiliary components.

Availability

BUK1M200-50SDLD is available at Aetrix Electronics and suitable for industrial PLC output modules, HVAC actuator control, and building management system heater zoning requiring stable component supply and long-term lifecycle support.

Supply support for BUK1M200-50SDLD 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 BUK1M200-50SDLD belongs to NXP's legacy TOPFET™ family of intelligent power switches, engineered specifically for ruggedized industrial control systems demanding high reliability, integrated protection, and minimal external component count.

FAQ

What is the maximum continuous drain current per channel for BUK1M200-50SDLD?

The BUK1M200-50SDLD does not specify a single maximum continuous drain current; instead, it features programmable current limiting dependent on input-source voltage. At VIS = 5 V, the typical drain current limit is 1.3 A per channel, with a min/max range of 0.8–1.7 A. This limit is enforced by internal circuitry and remains active until the protection latch is reset by lowering VIS below 2.9 V.

Does BUK1M200-50SDLD support 3.3 V logic-level input control?

Yes, BUK1M200-50SDLD supports 3.3 V logic-level inputs. Its input-source threshold voltage (VIS(th)) ranges from 0.6 V to 2.4 V, and typical operation begins at VIS ≥4 V. At 3.3 V, the device remains in the off-state but retains full ESD protection and latch-reset capability - for reliable turn-on, 4 V minimum is recommended per datasheet Figure 6 and Table 5.

How is thermal protection implemented in BUK1M200-50SDLD?

BUK1M200-50SDLD implements per-channel overtemperature protection with a junction temperature threshold of 150–165 °C. When exceeded, the channel latches off and remains disabled until VIS is reduced to ≤2.9 V for ≥100 µs. Thermal resistance from junction to solder point is 13.3 K/W with all four channels active, requiring adequate copper pour and thermal vias for sustained operation near limits.

Can BUK1M200-50SDLD safely switch inductive loads like solenoids?

Yes, BUK1M200-50SDLD is explicitly designed for inductive load switching. It incorporates "overfatigue clamping" that activates during turn-off to clamp drain-source voltage spikes, with non-repetitive clamping energy rated at 100 mJ. This feature suppresses transients exceeding 50 V, protecting both the device and downstream circuitry without requiring external flyback diodes in many cases.

What is the function of the n.c. pins (1, 10, 11, 20) on BUK1M200-50SDLD?

Pins 1, 10, 11, and 20 on the BUK1M200-50SDLD are designated as "not connected" (n.c.) in the official pin description table. These are mechanical pads with no internal silicon connection. They must remain unconnected in PCB layout - neither grounded nor routed - to avoid unintended coupling or thermal interference, as confirmed in Section 2.1 of the Philips product data sheet Rev. 01.