Nexperia USA Inc. BSP52,115

Overview

BSP52 from Nexperia is an NPN Darlington transistor in SOT223 (SC-73) package, delivering 1 A continuous collector current, 80 V V_CES, and DC current gain (h_FE) ≥1000 at I_C = 150 mA. It integrates base-emitter clamping diode and series base resistor, enabling direct logic-level drive in high-gain switching applications such as industrial relay drivers.

For engineers reviewing the BSP52 datasheet, BSP52 pinout, BSP52 application, or BSP52 equivalent, key selection criteria include verified Darlington saturation voltage (V_CE(sat) ≤ 1.3 V at I_C = 500 mA), thermal resistance to solder point (R_th(j-sp) = 17 K/W), junction temperature limit (150 °C), and non-automotive qualification status.

Technical Context

The BSP52 implements a monolithic NPN Darlington pair with integrated base-emitter clamp diode and on-chip base resistor, eliminating external bias components for simplified logic-driven switching. Its architecture supports high DC gain (h_FE up to 2000 at I_C = 500 mA) while maintaining low V_CE(sat) under high-current conditions.

Thermal performance is optimized via the SOT223's exposed collector pad, achieving R_th(j-sp) = 17 K/W when mounted on FR4 PCB with 1 cm² copper area - critical for sustained 1 A operation without active cooling. Switching behavior is characterized by t_on = 500 ns and t_off = 1300 ns under defined test conditions (I_Bon/I_Boff = ±0.5 mA).

Key Specifications

Pinout & Package

SOT223 (SC-73) surface-mount plastic package with 4 leads, 2.3 mm pitch, and integrated heatsink pad (lead 2 and 4 both connected to collector). Dimensions: 6.5 mm × 3.5 mm × 1.65 mm body; exposed collector pad improves thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSS12500UW3T1G and DXT696BK-13, the BSP52 uniquely combines 80 V rating, integrated base resistor, and clamping diode - reducing component count and layout complexity specifically for 24–48 V industrial control nodes.

Availability

BSP52 is available at Aetrix Electronics and suitable for industrial relay drivers, DC motor on/off controllers, LED string power switches, and high-gain sensor amplifiers requiring stable component supply across extended production lifecycles.

Supply support for BSP52 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, headquartered in Nijmegen, Netherlands.

The BSP52 belongs to Nexperia's general-purpose bipolar transistor family designed for industrial and consumer switching applications where integration, thermal efficiency, and ease of use outweigh ultra-high-speed requirements.

FAQ

Is BSP52 qualified for automotive applications?

No. The BSP52 is explicitly designated as non-automotive in its revision history (v.4, 20250930), with no AEC-Q101 qualification or automotive-grade testing. It is intended for industrial, consumer, and commercial equipment only. Automotive designs require Nexperia's -Q suffix variants, such as BSP52-Q.

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

The datasheet specifies R_th(j-a) = 96 K/W and R_th(j-sp) = 17 K/W when mounted on FR4 with a 1 cm² tin-plated copper pad for the collector. Increasing copper area beyond 1 cm² yields diminishing thermal returns; no derating formula is provided for larger pads, so 1 cm² remains the validated baseline for rated 1 A operation.

Can BSP52 replace a standard NPN transistor like BC817 in existing designs?

No, not directly. The BSP52 is a Darlington with integrated resistor and diode, exhibiting ~1.9 V V_BE(sat) and much higher h_FE. Replacing a BC817 would require removing external base resistors, verifying V_CE(sat) margin at load current, and confirming that the higher V_BE does not starve upstream logic drivers - redesign is necessary, not drop-in substitution.

Does BSP52 have built-in ESD protection?

No. The datasheet does not specify Human Body Model (HBM) or IEC 61000-4-2 ESD ratings. As a general-purpose discrete transistor, it lacks dedicated ESD structures. System-level ESD protection (e.g., TVS diodes on collector/emitter lines) must be implemented externally in environments with electrostatic risk.