Nexperia USA Inc. BSR41F

Overview

BSR41F from Nexperia is an NPN medium-power bipolar junction transistor in SOT89 package, rated for 60 V V_CEO, 1 A continuous collector current, and 2 A peak pulse current. It delivers DC current gain (h_FE) of 50–300 at I_C = 100 mA–500 mA, with V_CE(sat) ≤ 500 mV at I_C = 500 mA / I_B = 50 mA. It serves as a low-side switch or linear regulator pass element in battery-powered industrial control modules.

For engineers reviewing the BSR41F datasheet, BSR41F pinout, BSR41F application, or BSR41F equivalent, key selection criteria include its 1.35 W power dissipation at T_amb ≤ 25 °C, 93 K/W junction-to-ambient thermal resistance, and verified suitability for MOSFET gate driving and linear voltage regulation where moderate speed and robust DC gain are required.

Technical Context

The BSR41F operates as a standard NPN switching and amplification device with fixed three-terminal topology (Emitter, Collector, Base). Its design supports DC-coupled linear operation up to 500 mA and pulsed switching with t_on ≤ 250 ns and t_off ≤ 1 µs under defined test conditions (I_Con/I_Coff = ±5 mA).

Thermal performance is defined for mounting on FR4 PCB with 6 cm² collector pad, yielding R_th(j-sp) = 13 K/W to solder point. Electrical characteristics are specified across –65 °C to 150 °C ambient and junction temperature ranges, with absolute maximum ratings including V_CBO = 70 V and V_EBO = 5 V.

Key Specifications

Pinout & Package

SOT89 (SC-62) plastic surface-mounted package with exposed die pad for thermal conduction; 3-lead, 1.5 mm pitch, 4.5 mm × 2.5 mm × 1.5 mm body; collector connected to tab for direct PCB thermal path.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN medium-power transistor applications.

Compared with BSR31 and ZTX653, the BSR41F provides optimal balance of voltage rating, current capacity, thermal efficiency, and footprint size for low-to-medium voltage switching and linear regulation-making it preferred where SOT89's compactness and 1.35 W dissipation are critical.

Availability

BSR41F is available at Aetrix Electronics and suitable for linear voltage regulators, low-side switches, and battery-driven devices requiring stable component supply and consistent parametric performance across production lots.

Supply support for BSR41F 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

Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, spun off from Philips and headquartered in Nijmegen, Netherlands.

The BSR41F belongs to Nexperia's general-purpose bipolar transistor product line, engineered for cost-sensitive industrial and consumer applications demanding proven robustness, tight parameter distribution, and long-term manufacturability.

FAQ

What is the maximum allowable junction temperature for continuous operation of the BSR41F?

The BSR41F has a maximum junction temperature (T_j) rating of 150 °C, as defined in its Absolute Maximum Ratings table. Operation above this temperature risks permanent degradation of silicon structure and electrical parameters. Derating is required above T_amb = 25 °C per the R_th(j-a) = 93 K/W curve, and thermal design must ensure T_j remains below 150 °C under worst-case load and ambient conditions.

Can the BSR41F be used in automotive applications?

No-the BSR41F is explicitly designated as non-automotive qualified in its revision history and legal disclaimers. It lacks AEC-Q101 qualification, automotive-grade screening, and extended temperature validation beyond commercial specifications. For automotive use, Nexperia offers Q-qualified variants (e.g., BSR41-Q), which undergo additional stress testing and process controls.

How does the exposed collector pad on the SOT89 package affect PCB layout?

The exposed collector pad on the BSR41F's SOT89 package must be soldered directly to a dedicated copper pour or thermal pad on the PCB to achieve the specified R_th(j-sp) = 13 K/W. Layout requires ≥6 cm² of single-sided copper, tin-plated, connected to the collector net. Thermal vias beneath the pad are recommended to improve heat transfer to inner layers or backside planes.

Is the BSR41F pin-compatible with other SOT89 transistors like MMBT4401?

No-while both use SOT89 packages, the BSR41F has E-C-B pinout (1–2–3), whereas MMBT4401 uses C-B-E (1–2–3). Swapping them without verifying pin mapping will cause immediate circuit failure. Always cross-check pinning diagrams: BSR41F Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base per Table 2 of the datasheet.