Nexperia USA Inc. BSP41,115

Overview

BSP41,115 from Nexperia is an NPN medium power transistor in SOT223 package, rated for 60 V V_CEO, 1 A continuous collector current, and 1.3 W total power dissipation at T_amb ≤ 25 °C. It delivers DC current gain (h_FE) of 100–300 at I_C = 100 mA, with V_CE(sat) ≤ 0.25 V at I_C = 150 mA / I_B = 15 mA - used in telephony line interface stages and industrial relay drivers.

For engineers reviewing the BSP41,115 datasheet, BSP41,115 pinout, BSP41,115 application, or BSP41,115 equivalent, key selection factors include its 60 V V_CEO rating, SOT223 thermal performance (R_{th j-a} = 93 K/W), low saturation voltage under medium-current switching, and compatibility with thick/thin-film PCB layouts requiring discrete NPN gain and drive capability.

Technical Context

This device operates as a general-purpose NPN bipolar junction transistor optimized for linear amplification and medium-speed switching up to 100 MHz (f_T). Its design supports stable DC biasing with h_FE min. 30 at I_C = 100 μA and min. 50 at I_C = 500 mA, enabling consistent gain across operating ranges.

Thermal management relies on the exposed collector pad in the SOT223 package, delivering R_{th j-s} = 12 K/W to soldering point and enabling 1.3 W dissipation on 1 cm² single-sided copper. Absolute maximum ratings are defined per IEC 60134, including V_CBO = 70 V and T_j = 150 °C.

Key Specifications

Pinout & Package

SOT223 plastic surface-mounted package with exposed collector pad for enhanced thermal transfer; 4-lead configuration (pins 2 and 4 internally connected to collector).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ZTX653 and MJD122G, BSP41,115 offers optimal balance of 60 V rating, 1 A capability, low V_CE(sat), and proven SOT223 thermal performance - making it preferred for space- and thermally-constrained 24–48 V industrial and telecom designs where efficiency and reliability are prioritized over extreme voltage margin.

Availability

BSP41,115 is available at Aetrix Electronics and suitable for telecom line interface, industrial relay driver, and thick-film power stage applications requiring stable component supply, long-term manufacturability, and traceable sourcing.

Supply support for BSP41,115 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 leader in discrete, logic, and PowerMOS semiconductors, formed in 2017 from the former NXP Standard Products division, with focus on automotive, industrial, computing, and consumer markets.

BSP41,115 belongs to Nexperia's legacy NPN medium-power transistor product line, designed specifically for reliable linear amplification and medium-current switching in cost-sensitive, thermally demanding industrial and telecom equipment.

FAQ

Is BSP41,115 pin-compatible with BSP43?

No. While both use SOT223 and share identical pinout (pin 1 = base, pins 2+4 = collector, pin 3 = emitter), BSP43 has higher voltage ratings (V_CEO = 80 V, V_CBO = 90 V) and is not a drop-in replacement in 60 V–limited designs due to different internal doping and safe operating area. Electrical validation is required before substitution.

What is the maximum allowable PCB copper area for thermal performance?

The datasheet specifies 1 cm² single-sided tin-plated copper for the collector pad to achieve R_{th j-a} = 93 K/W. Increasing copper area beyond 1 cm² yields diminishing returns; doubling area reduces R_{th j-a} by only ~10–15 K/W. Thermal vias to inner layers are recommended for >0.8 W continuous operation.

Does BSP41,115 support pulsed operation above 1 A?

Yes - I_CM = 2 A peak collector current is specified for pulse widths ≤ 300 μs with duty cycle ≤ 1%. This enables short-duration surge handling in relay coil snubbing or inrush limiting, provided average power remains within P_tot derating curves and junction temperature stays below 150 °C.

Can BSP41,115 be used in Class AB audio output stages?

It can be used in low-power Class AB emitter-follower output stages (e.g., <500 mW into 8 Ω), but f_T = 100 MHz and h_FE roll-off above 10 MHz limit full-audio bandwidth fidelity. For Hi-Fi applications, complementary pairs with tighter h_FE matching and lower C_ob are preferred; BSP41,115 suits cost-sensitive voice-band or alarm-tone amplifiers.