STMicroelectronics ST13003-K

Overview

ST13003-K from STMicroelectronics is a high-voltage fast-switching NPN power transistor in SOT-32 (TO-126) package, rated for V_CEO = 400 V, I_C = 1.5 A, P_TOT = 40 W at T_C = 25 °C, with t_r/t_f = 1/0.7 μs (resistive load) and R_thJC = 3.1 °C/W. It is engineered for electronic ballasts in compact fluorescent lamps (CFL) and switch-mode power supplies (SMPS) in battery chargers.

For engineers reviewing the ST13003-K datasheet, ST13003-K pinout, ST13003-K application, or ST13003-K equivalent, key selection criteria include its 400 V collector-emitter sustaining voltage, 1.5 A DC collector current capability, fast switching performance under resistive and inductive loads, cellular emitter structure for wide RBSOA, and SOT-32 thermal and mechanical compatibility with TO-126 footprint designs.

Technical Context

This device uses high-voltage multi-epitaxial planar technology with planar edge termination to achieve simultaneous high breakdown voltage and fast switching. Its cellular emitter layout enhances carrier distribution and reduces storage time-t_s = 0.8 μs under inductive load (L = 50 mH, V_Clamp = 300 V).

The transistor supports pulsed operation up to I_CM = 3 A (t_P < 5 ms) and maintains safe operating area integrity across temperature (T_J = –40 to 150 °C), with V_CE(sat) = 1.5 V at I_C = 1.5 A / I_B = 0.5 A and h_FE ≥ 5 at I_C = 1 A.

Key Specifications

Pinout & Package

The ST13003-K is housed in an SOT-32 (TO-126) plastic package with exposed collector tab for thermal conduction and mechanical mounting. The package complies with ECOPACK® environmental specifications and features standardized TO-126 pin spacing and outline per Figure 14 and Table 5 in DocID13533 Rev 5.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN power transistor applications.

Compared with BU2508AX and MJE13003, the ST13003-K offers superior dynamic parameter consistency and optimized RBSOA for cost-sensitive, high-volume CFL and charger applications-balancing voltage margin, thermal performance, and manufacturability in SOT-32.

Availability

ST13003-K is available at Aetrix Electronics and suitable for electronic ballasts for fluorescent lighting (CFL), switch-mode power supplies (SMPS) for battery chargers, and industrial DC-DC converters requiring stable component supply and long-term production continuity.

Supply support for ST13003-K 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, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs and discrete devices for automotive, industrial, and consumer markets.

The ST13003-K belongs to ST's high-voltage bipolar power transistor product line, developed specifically for energy-efficient lighting and compact offline power conversion where reliability, thermal performance, and switching consistency are critical.

FAQ

What is the maximum junction temperature for ST13003-K?

The ST13003-K has a specified operating junction temperature range of –40 to +150 °C. This upper limit is defined under steady-state thermal conditions with proper heatsinking and must be verified using R_thJC = 3.1 °C/W and actual case temperature measurements-not ambient-to avoid exceeding TJ(max) during continuous operation.

Is ST13003-K pin-compatible with MJE13003?

Yes, ST13003-K and MJE13003 share identical SOT-32 (TO-126) mechanical dimensions and pin assignment (Emitter=1, Collector=2, Base=3). Both devices mount to the same footprint and use the same hole pattern, enabling direct physical substitution in existing PCB layouts without modification.

Does ST13003-K require a heatsink in typical CFL ballast operation?

Yes-a heatsink is required. At 1.5 A collector current and 400 V blocking, power dissipation exceeds 1 W even with fast switching. With R_thJC = 3.1 °C/W and typical ambient temperatures, junction temperature rises rapidly without thermal interface to a heatsink; ST recommends minimum 15 cm² aluminum heatsink for continuous 25 kHz operation.

What is the difference between V_CEO and V_CES ratings for ST13003-K?

V_CEO = 400 V is the collector-emitter voltage with base open (IB = 0), representing standard off-state blocking capability. V_CES = 700 V is measured with base-emitter shorted (V_BE = 0), indicating enhanced surge tolerance during transient overvoltage events such as lightning-induced line spikes in AC-connected lighting systems.