Nexperia USA Inc. BSP50,115

Overview

BSP50 from Nexperia is an AEC-Q101-qualified NPN Darlington transistor in SOT223 (SC-73) package, delivering 1 A continuous collector current, 45 V V_CES, and DC current gain (h_FE) ≥1000 at 150 mA - designed for high-gain industrial switching and amplification where low base drive and robust thermal performance are required.

For engineers reviewing the BSP50 datasheet, BSP50 pinout, BSP50 application, or BSP50 equivalent, this page provides verified pin functions, thermal resistance values (R_th(j-sp) = 17 K/W), saturation voltage (V_CE(sat) ≤ 1.3 V @ 500 mA), AEC-Q101 qualification status, and validated automotive-grade alternatives.

Technical Context

The BSP50 integrates two NPN transistors in Darlington configuration with built-in base-emitter resistor and clamp diode, enabling high current gain while reducing external component count. Its dual-collector pinning (Pins 2 & 4) supports enhanced thermal dissipation via PCB heatsinking.

Designed for operation up to 150 °C junction temperature, it features low R_th(j-sp) = 17 K/W and P_tot = 1.25 W on FR4 PCB - making it suitable for space-constrained industrial controls requiring stable gain under elevated ambient conditions.

Key Specifications

Pinout & Package

SOT223 (SC-73) plastic surface-mounted package with 4 leads, 4.6 mm pitch, 6.5 mm × 3.5 mm × 1.65 mm body, and integrated heatsink tab (Pin 4 connected to collector).

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSS12500UW3T1G and DXT695BKQ-13, the BSP50 uniquely balances 1 A current capability, 45 V rating, and 17 K/W thermal resistance - making it the only option among the three qualified for sustained 24 V industrial relay switching with minimal heatsinking.

Availability

BSP50 is available at Aetrix Electronics and suitable for industrial relay drivers, automotive body control modules, high-gain sensor amplifiers, and thermal management fan controllers requiring stable component supply across extended production lifecycles.

Supply support for BSP50 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, with leadership in automotive-qualified components and advanced packaging technologies.

The BSP50 belongs to Nexperia's AEC-Q101-qualified Darlington transistor family, engineered specifically for industrial and automotive load-switching applications demanding high gain, integrated protection, and proven thermal robustness in compact SOT223 packages.

FAQ

Is the BSP50 pin-compatible with the PNP complement BSP60?

No - BSP50 (NPN) and BSP60 (PNP) share the same SOT223 package outline and pin numbering, but their internal polarity and terminal functions differ. Pin 1 is base for both, but collector/emitter roles are reversed; direct substitution without circuit redesign will cause functional failure.

What is the maximum allowable PCB copper area for the collector tab (Pin 4) to achieve full 1.25 W power dissipation?

To achieve the rated 1.25 W total power dissipation at T_amb = 25 °C, the collector tab (Pin 4) must be soldered to a minimum 1 cm² single-sided FR4 copper pad, tin-plated, per Nexperia's thermal test condition in Table 4. Reducing pad size increases R_th(j-a) and requires corresponding I_C derating.

Does the integrated base resistor eliminate the need for an external base resistor in all configurations?

The internal base resistor enables basic on/off switching without external biasing, but for linear-mode operation or precise gain control, an external resistor may still be needed to set optimal base current and prevent thermal runaway - especially at elevated temperatures or near I_C limits.

Can the BSP50 replace standard single NPN transistors like BC817 in existing designs?

Only with circuit revision: BSP50's Darlington structure yields higher V_BE(sat) (~1.9 V vs. ~0.7 V), slower switching (t_off = 1300 ns), and different gain linearity. It is not a drop-in replacement; redesign is required to accommodate higher base drive voltage and revised timing margins.