onsemi BSP16T1

Overview

BSP16T1 from onsemi is a PNP silicon high-voltage transistor designed for switching and linear amplification in off-line power supplies, relay drivers, and HV interface circuits. It supports −300 V_CEO, −100 mA I_C, and 1.5 W dissipation at T_A = 25°C, with h_FE of 30–120 and f_T ≥ 15 MHz - used in flyback snubber networks and industrial control input stages.

For engineers reviewing the BSP16T1 datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CEO = −300 V, SOT−223 package thermal resistance (R_JA = 83.3°C/W), ICBO ≤ −1.0 μA, and confirmed PNP polarity with base-emitter cutoff voltage rating of −6.0 V.

Technical Context

This device operates as a medium-speed, high-voltage PNP bipolar junction transistor optimized for robustness under inductive load switching. Its −300 V V_CEO and −350 V V_CBO ratings enable use in 230 VAC-derived circuits, while its 15 MHz f_T supports stable operation up to ~1–2 MHz switching frequencies in snubber-assisted topologies.

The SOT−223 package integrates collector leads (pins 2 and 4) for enhanced thermal conduction, and its h_FE range (30–120) allows predictable DC bias design across production lots. Cobo ≤ 15 pF minimizes capacitive loading in high-impedance gate-drive or feedback paths.

Key Specifications

Pinout & Package

SOT−223 (Case 318E), surface-mount package with exposed collector tab (pins 2 and 4 electrically connected to collector). Thermal pad requires solder connection for rated R_JA.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage switching applications.

Compared with BSP16T1, MJD2955T4G delivers far greater current but cannot replace it in 300 V snubber or AC monitor roles due to voltage limitation; ZTX603 matches voltage and current specs but requires derating above 0.6 W due to inferior thermal performance in SOT−89.

Availability

BSP16T1 is available at Aetrix Electronics and suitable for industrial relay drivers, off-line flyback snubbers, AC input monitors, and isolated feedback interfaces requiring stable component supply and long-term manufacturability.

Supply support for BSP16T1 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier focused on energy-efficient electronics, delivering power, analog, sensor, and connectivity solutions for automotive, industrial, and cloud infrastructure markets.

The BSP16T1 belongs to onsemi's high-voltage bipolar transistor family, engineered specifically for ruggedized switching and linear operation in mains-connected industrial controls and power conversion systems.

FAQ

What is the maximum safe operating voltage for BSP16T1 in continuous DC conditions?

The BSP16T1 is rated for −300 V_CEO and −350 V_CBO under DC conditions per its official datasheet. For reliable long-term operation, design should maintain V_CE ≤ −270 V and V_CB ≤ −315 V to provide 10% margin against voltage transients. Exceeding these values risks avalanche breakdown and accelerated degradation of the BSP16T1 junction.

Does BSP16T1 require a heatsink in typical SOT−223 PCB layouts?

The BSP16T1 can dissipate up to 1.5 W at T_A = 25°C with its specified 0.93 in² copper pad - no external heatsink needed below ~1.2 W. At 1.5 W, junction temperature reaches ~150°C even with ideal layout; therefore, for sustained >1.0 W operation, thermal vias and extended copper pour are recommended to keep the BSP16T1 within safe TJ limits.

Can BSP16T1 be used as a direct replacement for BSP16 in legacy designs?

Yes - the BSP16T1 is the tape-and-reel, Pb-free version of the legacy BSP16, sharing identical electrical specifications, pinout, and SOT−223 package. The "T1" suffix denotes tape-and-reel packaging, and "G" indicates RoHS compliance; both devices have identical V_CEO, h_FE, and thermal characteristics, making BSP16T1 a drop-in replacement for BSP16 in new production.

What is the typical base current needed to saturate BSP16T1 at I_C = −100 mA?

Per the datasheet, V_CE(sat) is guaranteed ≤ −2.0 V at I_C = −50 mA and I_B = −5.0 mA - implying a forced beta (I_C/I_B) of 10. To ensure saturation at −100 mA, apply I_B ≥ −10 mA. A 1.0 kΩ base resistor from a −5 V logic source delivers −5 mA; thus, a 470 Ω resistor is recommended to guarantee ≥−10 mA drive for full BSP16T1 saturation.

How does BSP16T1 perform in high-temperature environments like industrial enclosures?

The BSP16T1 has a maximum junction temperature of 150°C and storage range of −65°C to +150°C. At T_A = 85°C, its power dissipation must be derated to ~0.8 W (per R_JA = 83.3°C/W). Its h_FE remains functional down to −65°C, and ICBO increases only to ~−5 μA at 125°C - confirming suitability for sealed industrial enclosures where ambient stays ≤85°C and airflow is limited.