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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

STMicroelectronics STK13003

Name: STK13003
Brand: STMicroelectronics
SKU: STK13003
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STK13003

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: SOT-82

Datasheet:: STK13003.pdf

Description:: TRANS NPN 400V 1.5A SOT-82-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STK13003 from STMicroelectronics is a high-voltage fast-switching NPN power transistor in SOT-82 package, rated for V_CES = 700 V, I_C = 1.5 A, and P_tot = 40 W at T_c = 25°C, optimized for electronic ballasts in compact fluorescent lamps (CFLs) and switch-mode power supplies (SMPS) for battery chargers.

For engineers reviewing the STK13003 datasheet, STK13003 pinout, STK13003 application, or STK13003 equivalent, key selection criteria include V_CEO = 400 V (IB = 0), t_r/t_f ≤ 1 µs/0.7 µs (resistive load), h_FE = 8–25 (IC = 0.5–1 A), and reverse-pin-out SOT-82 mechanical configuration.

Technical Context

This NPN bipolar junction transistor uses high-voltage multi-epitaxial planar technology with cellular emitter structure and planar edge termination to simultaneously achieve high breakdown voltage and fast switching. Its RBSOA is widened without sacrificing dynamic performance.

The device operates with pulsed collector current up to 3 A (t_P < 5 ms), supports inductive load switching with t_s = 0.8 µs under V_BE = −5 V clamping, and maintains low lot-to-lot spread in V_CE(sat), h_FE, and switching times for production reliability.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CES	700 V - maximum collector-emitter voltage with base open, enabling use in 400 V DC bus SMPS and CFL resonant inverters
I_C	1.5 A continuous - defines steady-state power handling in ballast driver stages and primary-side switching
t_r/t_f	1 µs / 0.7 µs - rise/fall times under resistive load (V_CC = 125 V, I_C = 1 A), critical for EMI control and efficiency in 20–60 kHz ballasts
V_CE(sat)	1.5 V @ I_C = 1.5 A, I_B = 0.5 A - low saturation voltage minimizes conduction loss and thermal stress in high-duty-cycle operation
h_FE	5–25 - DC current gain range across operating conditions, supporting stable base drive design for discrete BJT-based half-bridge drivers
T_J(max)	150 °C - maximum junction temperature allowing reliable operation with heatsink derating per Figure 3

Pinout & Package

SOT-82 is a 3-lead, single-ended, through-hole power package with reverse pinout (Emitter–Base–Collector, left-to-right when viewed from top with tab facing away). Leads are tin-plated, lead-free per ECOPACK® specification.

Pin/Terminal	Circuit Role	Design Meaning
E (Emitter)	Current sink node	Connected to ground or low-side return path; largest thermal mass in SOT-82, requires PCB copper pour for heat dissipation
B (Base)	Control input	Drives transistor into saturation or cutoff; requires current-limited drive (I_B ≤ 0.75 A) to avoid secondary breakdown
C (Collector)	High-voltage output node	Switches 400–700 V loads; connected to transformer primary or resonant tank; electrically isolated from mounting surface

Key Features

Feature	Design Value
Reverse-pin-out SOT-82	Enables direct replacement of legacy devices with swapped emitter/collector layout, avoiding PCB redesign in existing CFL ballast layouts
Cellular emitter + planar edge termination	Delivers wide RBSOA while maintaining t_s = 0.8 µs in inductive switching, improving ruggedness in SMPS overcurrent events
Low dynamic parameter spread	Ensures consistent t_r, t_f, and V_CE(sat) across production lots-critical for batch-manufactured lighting products requiring tight EMI compliance
ECOPACK® lead-free construction	Meets RoHS and JEDEC JESD97 requirements; second-level interconnect marked on package and inner box label

Applications

Compact Fluorescent Lamp (CFL) Ballast

SMPS Battery Charger

Use Scenario: Drives resonant LC tank in 20–60 kHz self-oscillating or IC-controlled CFL inverters.

IC Role / Device Role / Timing Role: Main high-voltage switching transistor in half-bridge topology, handling peak currents up to 3 A during startup.

Use Value: V_CEO = 400 V and t_r/t_f ≤ 1 µs enable efficient zero-voltage switching transitions and low audible noise in lamp ignition.

Use Scenario: Primary-side switch in flyback or forward converters for 12–24 V battery charging systems.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlled by discrete oscillator/driver circuit, operating at fixed 50–100 kHz.

Use Value: Low V_CE(sat) = 1.5 V and high h_FE reduce base drive power and improve full-load efficiency above 85%.

DC-AC Inverter Module

Industrial Lighting Control

Use Scenario: Used in low-cost 12–48 V input inverters powering 220 V AC fluorescent fixtures.

IC Role / Device Role / Timing Role: Single-ended switch in push-pull or Royer oscillator configurations, dissipating up to 40 W at T_c = 25°C.

Use Value: P_tot = 40 W and T_J(max) = 150 °C allow operation with minimal heatsinking in enclosed fixture housings.

Use Scenario: Dimmable high-bay lighting drivers with analog or PWM intensity control.

IC Role / Device Role / Timing Role: Power stage switch modulated via base current adjustment to regulate lamp brightness without flicker.

Use Value: Tight h_FE spread (8–25) ensures predictable dimming linearity across manufacturing batches.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BU508A	V_CES = 1500 V, I_C = 8 A, slower t_r/t_f (0.5 µs typ), TO-220 package	Higher voltage margin but larger footprint and lower switching efficiency in 20–60 kHz CFLs	Preferred where surge immunity > 1 kV is required; not drop-in due to package and drive current mismatch
2SC5387	V_CES = 500 V, I_C = 1.5 A, t_r/t_f ≈ 0.8 µs, standard SOT-82 pinout	Lacks reverse-pin-out compatibility and has narrower RBSOA in inductive switching	Valid alternative only if PCB layout revised to match standard emitter-collector orientation

Compared with BU508A and 2SC5387, STK13003 uniquely combines reverse-pin-out SOT-82 compatibility, 700 V rating, and sub-microsecond switching for cost-sensitive CFL and SMPS designs where board space and EMI are constrained.

Availability

STK13003 is available at Aetrix Electronics and suitable for compact fluorescent lamp (CFL) ballasts, switch-mode power supplies (SMPS) for battery chargers, and industrial DC-AC inverter modules requiring stable component supply and long-term manufacturability.

Supply support for STK13003 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 power devices for industrial, automotive, and consumer markets.

The STK series targets high-voltage discrete power transistors for lighting and power conversion, emphasizing ruggedness, consistency, and ease of integration in cost-sensitive, high-volume applications.

FAQ

What is the correct pinout orientation for STK13003 in SOT-82?

When viewing the top of the SOT-82 package with the metal tab oriented away from the observer, the leads from left to right are Emitter (E), Base (B), and Collector (C). This reverse pinout differs from standard SOT-82 devices, where Collector is typically leftmost. Confirm orientation using the "K13003" marking and mechanical drawing on page 8 of the official datasheet.

Can STK13003 be used in avalanche mode?

No. STK13003 is not rated or characterized for repetitive avalanche operation. Its safe operating area (Figure 2 and Figure 5) defines limits under forward-biased and reverse-biased conditions, but no avalanche energy (E_AS) rating is provided. Operation beyond V_CEO = 400 V with IB = 0 must be avoided unless externally clamped.

What is the recommended base drive for reliable switching?

A peak base current of 0.5 A (IB = 0.5 A) is recommended for full saturation at IC = 1.5 A, with minimum drive of IB = 0.1 A for IC = 0.5 A. Base resistor must limit peak current to ≤0.75 A and ensure turn-off via active pull-down (e.g., −5 V clamp) to achieve ts = 0.8 µs in inductive loads, as shown in Figure 10.

Is STK13003 suitable for automotive applications?

No. STK13003 is not qualified to AEC-Q101 or any automotive grade standard. The datasheet explicitly states that ST products not specified as "automotive grade" are intended for industrial and consumer use only, and their use in automotive systems is at the user's own risk due to unvalidated temperature cycling, humidity, and vibration performance.

STK13003 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: SOT-82

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 1.5 A

Voltage - Collector Emitter Breakdown (Max):: 400 V

Vce Saturation (Max) @ Ib, Ic:: 1.5V @ 500mA, 1.5A

Current - Collector Cutoff (Max):: 5mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 5 @ 1A, 2V

Power - Max:: 40 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: SOT-82-3

STK13003 FAQ

1.How can I place an order for STK13003 through Aetrix?

Please submit a Request for Quotation (RFQ) for STK13003 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STK13003 reliable?

The price and inventory of STK13003 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STK13003 is usually 5 days.

3.What payment methods are accepted for STK13003?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STK13003 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STK13003?

STK13003 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STK13003 order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STK13003?

For technical support, including STK13003 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STK13003 requirements.

6.How does Aetrix verify that STK13003 is sourced from the original manufacturer or authorized distributors?

All STK13003 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STK13003 meets industry standards.

7.What is the process for return or replacement of STK13003?

All STK13003 units undergo pre-shipment inspection (PSI). If there is an issue with STK13003, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STK13003 part is unused and in its original packaging.

Return procedure for STK13003:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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