STMicroelectronics STN93003

Overview

STN93003 from STMicroelectronics is a high-voltage, fast-switching PNP power transistor in SOT-223 package, rated for V_CEO = −400 V, I_C = −1.5 A, and switching times of t_r = 1.5 ns / t_f = 2.9 ns (resistive load). It features cellular emitter structure and planar edge termination for wide RBSOA and optimized dV/dt immunity, and is expressly designed for electronic ballasts in compact fluorescent lamps (CFLs), operating in resonant half-bridge topologies with its complementary NPN partner STN83003.

For engineers reviewing the STN93003 datasheet, STN93003 pinout, STN93003 application in CFL ballasts, or STN93003 equivalent for high-voltage PNP switching, this page delivers verified electrical ratings, thermal derating behavior, avalanche energy (E_sb = 12 mJ), safe operating area (SOA) curves, and validated SOT-223 terminal mapping - all critical for lamp driver reliability and EMI-constrained lighting designs.

Technical Context

The STN93003 employs high-voltage multi-epitaxial planar technology to achieve simultaneous high breakdown voltage and fast switching. Its cellular emitter layout and planar edge termination suppress secondary breakdown while enabling stable operation under inductive switching stress (L = 4–10 mH) at V_Clamp = 300 V.

It operates in linear and active switching modes with DC current gain h_FE = 10–32 (I_C = −10 mA to −1 A, V_CE = −5 V), V_CE(sat) = −0.5 V (I_C = −0.5 A, I_B = −0.1 A), and V_BE(sat) = −1 V - parameters directly supporting gate drive design and conduction loss budgeting in CFL half-bridge drivers.

Key Specifications

Pinout & Package

SOT-223 package: 4-terminal surface-mount outline with exposed collector tab (pin 2) for thermal and electrical connection; standard footprint per ST mechanical drawing (Doc ID 12329 Rev 2, p.9).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STN93003, STN9360 trades voltage headroom and speed for cost reduction in legacy ballasts, while MJD44H11T4G offers higher current capacity but lacks the documented avalanche robustness and fast switching needed for modern resonant lamp drivers.

Availability

STN93003 is available at Aetrix Electronics and suitable for compact fluorescent lamp ballasts, high-voltage LED drivers, AC-DC active clamp circuits, and industrial relay emulation requiring stable component supply and long-term manufacturability.

Supply support for STN93003 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

The STN93003 belongs to ST's high-voltage bipolar transistor product line, engineered specifically for energy-efficient lighting control and rugged switching in resonant topologies where voltage, speed, and avalanche capability are co-critical.

FAQ

What is the maximum junction temperature and how does it affect thermal design?

The STN93003 has a maximum operating junction temperature of 150 °C. With R_thJA = 78 °C/W on a 1 cm² PCB, continuous 1.6 W dissipation raises T_J by 125 °C above ambient - meaning T_A must stay ≤25 °C for safe operation without heatsinking. For higher ambient, thermal vias and larger copper areas are required to reduce effective R_thJA.

Can STN93003 be used as a direct replacement for STN83003 in a half-bridge?

No - STN93003 is a PNP device and STN83003 is its complementary NPN counterpart; they serve opposite sides of the half-bridge. Swapping them would reverse polarity and prevent proper switching. The pair must be used together: STN93003 as high-side switch and STN83003 as low-side switch, with matched base drive timing.

Is the SOT-223 package lead-free and RoHS-compliant?

Yes - the STN93003 is manufactured in an ECOPACK®-compliant SOT-223 package, meeting RoHS Directive 2011/65/EU and being halogen-free per ST's environmental specifications. No lead or brominated flame retardants are used in the die attach, molding compound, or terminations.

What test conditions apply to the stated avalanche energy of 12 mJ?

The 12 mJ avalanche energy (E_sb) is measured under defined inductive switching conditions: L = 4 mH, T_C = 25–125 °C, I_BR ≤ −2.5 A, and C = 1.8 nF. This value reflects single-pulse ruggedness during unclamped inductive turn-off - critical for CFL lamp ignition surges - and is not rated for repetitive avalanche operation.