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

STMicroelectronics ST13003D-K

Name: ST13003D-K
Brand: STMicroelectronics
SKU: ST13003D-K
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST13003D-K

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: ST13003D-K.pdf

Description:: TRANS NPN 400V 1.5A SOT-32-3

Quantity:: RFQ Add To RFQ list

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Inventory:1,956

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Product details

Overview

ST13003D-K from STMicroelectronics is a high-voltage fast-switching NPN power transistor in SOT-32 package, rated for V_CEO = 400 V, I_C = 1.5 A, P_TOT = 40 W, with integrated antiparallel collector-emitter diode and t_r/t_f ≤ 1 µs/0.7 µs (resistive load), designed for electronic ballasts in fluorescent lighting systems.

For engineers reviewing the ST13003D-K datasheet, ST13003D-K pinout, ST13003D-K application, or ST13003D-K equivalent, key selection criteria include switching speed (t_s = 0.8 µs under inductive load), V_CE(sat) = 1 V @ I_C = 1 A / I_B = 0.25 A, RBSOA robustness, and built-in diode forward voltage (V_F = 1.5 V @ I_F = 0.5 A).

Technical Context

This device employs high-voltage multi-epitaxial planar technology with cellular emitter structure and planar edge termination to simultaneously achieve high switching speed and wide RBSOA. It supports both resistive and inductive switching loads, with specified storage time of 0.8 µs under inductive conditions (L = 50 mH, V_Clamp = 300 V).

The integrated antiparallel diode enables self-commutated operation in half-bridge ballast topologies without external freewheeling diodes. Its V_CEO(sus) = 400 V and V_CES = 700 V ratings support reliable operation in high-dv/dt fluorescent lamp ignition circuits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Sustaining voltage with base open; defines safe operating ceiling in ballast flyback and resonant start phases
I_C	1.5 A continuous - Maximum DC collector current at T_c = 25 °C; sets lamp drive capability in 30–40 W ballasts
P_TOT	40 W - Total dissipation at case temperature 25 °C; requires heatsinking for sustained 100% duty cycle
t_r/t_f	1 µs / 0.7 µs - Rise/fall times under resistive load; enables >50 kHz switching in compact ballast designs
V_F (diode)	1.5 V @ 0.5 A - Forward voltage of integrated C-E diode; reduces component count and PCB area vs discrete diode solutions
h_FE	5–25 @ I_C = 0.5–1 A - Current gain range confirms suitability for base-driven quasi-resonant control without feedback compensation
t_s (inductive)	0.8 µs - Storage time under inductive switching (L = 50 mH); critical for zero-voltage switching timing margin

Pinout & Package

SOT-32 (TO-126 compatible) three-terminal plastic package with collector tab connected to Pin 1 (case), emitter on Pin 2, base on Pin 3. Designed for through-hole mounting and direct heatsink attachment via metal tab.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Tab)	Collector	Electrically and thermally connected to metal tab; must be isolated from heatsink unless system ground reference permits
Pin 2	Emitter	Main current return path; low-inductance layout required to minimize switching oscillation in high-dv/dt ballast nodes
Pin 3	Base	Control input for bipolar drive; requires ≥0.25 A peak base current to ensure full saturation at I_C = 1.5 A

Key Features

Feature	Design Value
Integrated antiparallel diode	Eliminates need for external freewheeling diode in half-bridge ballast output stage, reducing BOM count and layout complexity
Wide RBSOA	Enables reliable operation under inductive switching stress without secondary breakdown, even at elevated case temperatures
Low dynamic parameter spread	Ensures consistent turn-off timing across production lots-critical for synchronized dual-transistor ballast architectures
High V_CES = 700 V	Provides margin against voltage spikes during lamp ignition and end-of-life arc instability in fluorescent tubes
ECOPACK® compliant	Meets RoHS and halogen-free requirements per ST's environmental packaging standards for lighting OEMs

Applications

Fluorescent Lamp Electronic Ballast

Compact Fluorescent Lamp (CFL) Driver

Use Scenario: High-frequency (25–65 kHz) half-bridge inverter driving 18–40 W T8/T5 fluorescent tubes with instant-start and programmed-start protocols.

IC Role / Device Role / Timing Role: Main switching transistor in upper/lower leg; handles lamp current commutation and resonant tank excitation.

Use Value: Integrated diode and 0.8 µs inductive storage time enable precise zero-voltage switching timing, reducing EMI and improving lamp life.

Use Scenario: Miniaturized self-oscillating or IC-controlled CFL driver board with integrated choke and resonant capacitor.

IC Role / Device Role / Timing Role: Power switch in series-resonant topology; conducts lamp current and sustains high-voltage transients during cold-start.

Use Value: V_CEO(sus) = 400 V and V_CES = 700 V provide robustness against 600+ V ignition spikes in sub-20 W compact lamps.

LED Driver Flyback Primary Switch

DC-DC Converter High-Voltage Switch

Use Scenario: Primary-side switch in isolated flyback LED drivers for streetlight or industrial high-bay luminaires (30–100 W).

IC Role / Device Role / Timing Role: High-voltage switching element handling reflected output voltage plus leakage spike; operates in discontinuous conduction mode.

Use Value: Wide RBSOA and 40 W dissipation rating allow stable operation at 400 V bus with minimal snubber loss.

Use Scenario: Step-down or forward converter primary switch in industrial 24–48 V input supplies delivering up to 60 W output.

IC Role / Device Role / Timing Role: Medium-voltage power switch replacing MOSFETs where gate drive simplicity and cost are prioritized over ultra-low R_DS(on).

Use Value: h_FE = 5–25 simplifies base drive design using discrete transistors or low-current controllers, avoiding dedicated gate drivers.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ST13003D	No "-K" suffix; identical electrical specs but non-ECOPACK® packaging (halogen-containing mold compound)	Same ballast functionality; not compliant with latest RoHS/halogen-free mandates for new designs	Select ST13003D-K for new lighting products requiring ECOPACK® compliance and long-term supply stability
BU2508DX	Higher V_CEO = 800 V, lower I_C = 1.25 A, no integrated diode, TO-126 package	Requires external diode; suited for higher-voltage lamp ignition but adds layout and BOM overhead	Choose BU2508DX only when >600 V blocking is mandatory and diode integration is unnecessary

Compared with ST13003D and BU2508DX, the ST13003D-K uniquely combines ECOPACK® compliance, integrated diode, and optimized 400 V/1.5 A balance-making it the preferred choice for cost-sensitive, RoHS-compliant fluorescent ballast production.

Availability

ST13003D-K is available at Aetrix Electronics and suitable for fluorescent lighting ballasts, compact lamp drivers, LED driver flyback primaries, and industrial DC-DC converters requiring stable component supply and legacy-compatible through-hole power transistors.

Supply support for ST13003D-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, specializing in power management, analog, microcontrollers, and automotive-grade ICs.

The ST13003D-K belongs to ST's high-voltage bipolar transistor product line, engineered specifically for energy-efficient lighting control and medium-power switching applications demanding reliability, thermal robustness, and regulatory compliance.

FAQ

Is ST13003D-K still in active production?

No-STMicroelectronics has marked ST13003D-K as obsolete per Doc ID 14182 Rev 2 (2009). However, Aetrix Electronics maintains verified legacy stock with full traceability and extended lifecycle support for existing designs requiring drop-in replacement or maintenance builds.

Can ST13003D-K replace ST13003 in existing PCB layouts?

Yes-ST13003D-K uses the same SOT-32 (TO-126) footprint and pinout as ST13003 and ST13003D. Electrical specifications are identical except for ECOPACK® packaging; no layout or schematic changes are needed for migration.

What is the maximum recommended case temperature for continuous operation?

The absolute maximum junction temperature is 150 °C, and total dissipation is rated at 40 W only at T_c = 25 °C. Derating is required above 25 °C; at T_c = 70 °C, maximum usable power drops to ~24 W based on linear derating slope of 0.33 W/°C.

Does the integrated diode support bidirectional current flow in bridge configurations?

No-the integrated diode is unidirectional, anode-connected to emitter and cathode to collector. It conducts only during reverse recovery (C→E), enabling freewheeling in half-bridge or single-ended flyback topologies-not true bidirectional switching.

ST13003D-K Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Bag

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:: 3V @ 500mA, 1.5A

Current - Collector Cutoff (Max):: 1mA

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-32-3

ST13003D-K FAQ

1.How can I place an order for ST13003D-K through Aetrix?

Please submit a Request for Quotation (RFQ) for ST13003D-K 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 ST13003D-K reliable?

The price and inventory of ST13003D-K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST13003D-K is usually 5 days.

3.What payment methods are accepted for ST13003D-K?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST13003D-K transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST13003D-K?

ST13003D-K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST13003D-K 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 ST13003D-K?

For technical support, including ST13003D-K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST13003D-K requirements.

6.How does Aetrix verify that ST13003D-K is sourced from the original manufacturer or authorized distributors?

All ST13003D-K 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 ST13003D-K meets industry standards.

7.What is the process for return or replacement of ST13003D-K?

All ST13003D-K units undergo pre-shipment inspection (PSI). If there is an issue with ST13003D-K, 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 ST13003D-K part is unused and in its original packaging.

Return procedure for ST13003D-K:

1.Submit a request within 90 days.

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

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