Nexperia USA Inc. BSP61,115

Overview

BSP61 from Nexperia is a PNP Darlington transistor in SOT223 (SC-73) package, rated for -60 V V_CE, -1 A continuous collector current, and featuring integrated base-emitter diode and resistor. It delivers high DC current gain (h_FE = 1000–2000 at -150 mA to -500 mA), low saturation voltage (-1.3 V at -500 mA), and AEC-Q101 qualification for automotive-grade reliability in industrial switching circuits.

For engineers reviewing the BSP61 datasheet, BSP61 pinout, BSP61 application, or BSP61 equivalent, this page provides verified electrical parameters, thermal resistance data (R_th(j-sp) = 17 K/W), switching timing (t_on = 400 ns, t_off = 1500 ns), and real-world use context for solenoid, relay, and lamp driver designs requiring robust discrete power control.

Technical Context

The BSP61 implements a monolithic PNP Darlington pair with built-in base-emitter clamping diode and series base resistor-eliminating external bias components in simple switch configurations. Its architecture supports direct TTL/CMOS-level drive while maintaining stable gain across -150 mA to -500 mA load currents.

Thermal design is enabled by the SOT223's exposed collector pad, delivering R_th(j-sp) = 17 K/W to solder point and R_th(j-a) = 98 K/W on FR4 PCB-critical for sustained operation near 1.25 W P_tot at T_amb ≤ 25 °C. Junction temperature is rated to 150 °C with storage range from -65 °C to 150 °C.

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 exposed collector pad for thermal management.

Key Features

Applications

Equivalent & Alternatives

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

Compared with NSS12201LT1G and DXT611100Q-13, the BSP61 uniquely combines -60 V rating, integrated bias/clamp, AEC-Q101 qualification, and 1000+ h_FE-making it the only option among the three qualified for automotive body electronics and high-reliability industrial switching.

Availability

BSP61 is available at Aetrix Electronics and suitable for industrial solenoid actuation, automotive relay driving, and commercial lamp switching requiring stable component supply and long-term production continuity.

Supply support for BSP61 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.

The BSP61 belongs to Nexperia's AEC-Q101-qualified discrete transistor portfolio, engineered specifically for robust, low-component-count switching in automotive body electronics and industrial control systems.

FAQ

Is BSP61 suitable for 48 V automotive battery systems?

No. The BSP61 has a maximum V_CE rating of -60 V, which provides only ~20 % margin over nominal 48 V systems. Transient spikes in 48 V architectures commonly exceed -60 V, risking breakdown. For 48 V applications, use transistors rated ≥-80 V such as the NXP PBSS4041T.

Can BSP61 replace the NPN BSP51 in the same circuit?

No-BSP61 is a PNP Darlington and BSP51 is its NPN complement. They operate with opposite polarity: BSP61 sinks current from load to ground (high-side switch), while BSP51 sources current from V_CC to load (low-side switch). Swapping them requires complete circuit re-biasing and layout revision.

What is the maximum safe switching frequency for BSP61?

Based on t_on = 400 ns and t_off = 1500 ns, the BSP61 supports reliable PWM operation up to ~100 kHz in continuous mode. At higher frequencies, duty cycle must be reduced to limit average power dissipation below 1.25 W, especially above 25 °C ambient.

Does BSP61 require an external flyback diode when driving inductive loads?

No-the BSP61 integrates a base-emitter clamping diode that provides partial flyback energy dissipation. However, for high-energy inductive loads (e.g., >100 mJ), an external diode across the load remains recommended to prevent voltage overshoot exceeding -60 V V_CE.