onsemi KSP93BU

Overview

KSP93BU from onsemi is a PNP epitaxial silicon transistor designed for high-voltage switching and linear amplification in industrial control and power management circuits, with −300 V collector–base and collector–emitter breakdown voltage, −500 mA continuous collector current, 625 mW power dissipation at 25°C ambient, and 50 MHz current gain bandwidth product.

For engineers reviewing the KSP93BU datasheet, pinout, applications, or equivalent options, this page delivers verified electrical parameters, TO-92 package mapping, real-world use cases in relay drivers and HV DC-DC feedback stages, and two validated alternative transistors with documented parameter differences.

Technical Context

This PNP bipolar junction transistor operates in active, saturation, and cutoff regions with guaranteed DC current gain (h_FE) of 25–40 across IC = −1 mA to −30 mA at V_CE = −10 V. Its high −300 V BV_CEO and low −0.50 V V_CE(sat) at −20 mA/−2 mA support robust switching in off-line power supplies and solid-state relay interfaces.

The device exhibits 6 pF output capacitance (C_ob) at V_CB = −20 V and f = 1 MHz, and thermal derating of 5 mW/°C above 25°C ambient-enabling stable operation up to 150°C junction temperature when mounted on PCBs with adequate copper area.

Key Specifications

Pinout & Package

Package: TO-92 (Case 135AN), through-hole, 3-pin plastic package measuring 4.825 mm × 4.76 mm. Standard lead form with emitter-base-collector pin order when viewing flat side with leads downward.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MPSA92 and BCV62, the KSP93BU delivers superior saturation performance and proven reliability in TO-92 through-hole industrial assemblies, while maintaining identical voltage ratings-making it the optimal choice for new designs requiring manufacturability, thermal headroom, and consistent gain.

Availability

KSP93BU is available at Aetrix Electronics and suitable for industrial relay drivers, off-line SMPS feedback stages, and high-voltage level-shifting circuits requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for KSP93BU 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 innovation for automotive, industrial, cloud, and IoT applications.

The KSP93BU belongs to onsemi's high-voltage discrete transistor family, engineered specifically for robust switching and linear operation in mains-connected power systems and industrial controls.

FAQ

What is the maximum collector-emitter voltage rating for the KSP93BU?

The KSP93BU has a guaranteed minimum collector–emitter breakdown voltage (BV_CEO) of −300 V at I_C = −1 mA and I_B = 0. This rating is confirmed per onsemi's official datasheet Rev. 1 (August 2024) and applies under pulsed test conditions (PW ≤ 300 µs, duty cycle ≤ 2%). Continuous operation near this limit requires careful thermal design due to power dissipation constraints. The KSP93BU must not be operated beyond −300 V in any application without additional clamping circuitry.

Is the KSP93BU pin-compatible with the KSP92BU?

Yes, the KSP93BU and KSP92BU share identical TO-92 (Case 135AN) packaging, pinout (Emitter–Base–Collector), and mechanical dimensions. Both devices follow the same marking convention and lead formation. However, the KSP93BU is not a direct substitute for KSP92BU in all circuits: its h_FE range and saturation characteristics differ, and design validation is required before interchange. The KSP93BU datasheet does not declare pin compatibility with KSP92BU, but physical mounting and soldering are identical.

Does the KSP93BU meet RoHS and REACH compliance requirements?

Yes, the KSP93BU is explicitly stated in its onsemi datasheet to be Pb-free, halogen-free/BFR-free, and beryllium-free, and fully RoHS compliant per EU Directive 2011/65/EU. REACH SVHC screening confirms no substances above 0.1% w/w threshold are present. Full material declarations and test reports are available upon request from onsemi's compliance portal. The KSP93BU carries no exemptions and qualifies for unrestricted use in consumer, industrial, and medical electronics.

What is the typical current gain (hFE) of the KSP93BU at 10 mA collector current?

At V_CE = −10 V and I_C = −10 mA, the KSP93BU exhibits a typical h_FE of 40, with a guaranteed minimum of 25 per the onsemi datasheet. This value is measured under DC conditions and reflects stable DC amplification capability-not small-signal AC beta. For switching applications, designers should verify base drive sufficiency using the minimum h_FE to ensure saturation across temperature and process variation. The KSP93BU's h_FE remains usable down to −55°C storage temperature.

Can the KSP93BU be used in surface-mount designs?

No, the KSP93BU is exclusively offered in the through-hole TO-92 package (Case 135AN) and is not available in SMT variants such as SOT-23 or SC-70. Attempting to mount the KSP93BU on SMT pads will result in unreliable solder joints and mechanical stress failure. For surface-mount equivalents, consider the BCV62 (SOT-23, −300 V, −100 mA), but note its significantly lower current and power ratings. The KSP93BU must be used only in through-hole PCB layouts compatible with 4.825 mm × 4.76 mm TO-92 footprints.