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

STMicroelectronics ST83003

Name: ST83003
Brand: STMicroelectronics
SKU: ST83003
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST83003

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

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

Datasheet:: ST83003.pdf

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

Quantity:: RFQ Add To RFQ list

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Inventory:7,061

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Product details

Overview

ST83003 from STMicroelectronics is a high-voltage fast-switching NPN power transistor designed for electronic ballasts in compact fluorescent lamps (CFLs), operating with V_CEO = 400 V, I_C = 1.5 A, and switching times as low as 1.5 ns (rise) and 2.2 µs (storage) under resistive load. It features cellular emitter structure and planar edge termination for enhanced RBSOA and speed.

For engineers reviewing the ST83003 datasheet, ST83003 pinout, ST83003 application in CFL ballasts, or ST83003 equivalent for high-voltage switching, this device delivers verified V_CES = 700 V capability, t_r/t_s/t_f timing data, and thermal resistance R_thJC = 3.1 °C/W - critical for thermal design in space-constrained lighting drivers.

Technical Context

The ST83003 employs multi-epitaxial planar technology to achieve simultaneous high breakdown voltage and fast switching, enabled by its cellular emitter layout and planar edge termination. Its safe operating area (SOA) is optimized for repetitive inductive switching at V_clamp = 300 V and L = 10 mH.

It is functionally paired with the complementary PNP ST93003 in half-bridge CFL ballast topologies, requiring precise base drive coordination (IB1 = 70 mA / IB2 = –70 mA) and exhibiting V_CE(sat) = 0.5 V at IC = 0.5 A, IB = 0.1 A - enabling low conduction loss during active switching phases.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CES	700 V - supports surge-tolerant operation in AC-line referenced ballast circuits without clamping
V_CEO	400 V - defines maximum sustainable collector-emitter voltage under open-base conditions in CFL half-bridge operation
I_C	1.5 A continuous - enables driving 20–30 W CFL lamps with margin for thermal derating
t_r/t_s/t_f	1.5 ns / 100 ns / 2.2 µs (resistive) - ensures <500 kHz switching feasibility with minimal overlap loss
R_thJC	3.1 °C/W - allows 40 W dissipation at T_C = 25 °C; requires heatsink interface ≤ 1.2 °C/W for T_J ≤ 150 °C at full load
h_FE	10–32 (IC = 10 mA to 1 A) - supports stable base-current-driven switching across lamp aging and temperature drift
V_BE(sat)	1 V @ IC = 0.5 A, IB = 0.1 A - enables low-loss base drive with standard 12 V logic-level drivers

Pinout & Package

SOT-32 (TO-225AA) package: insulated plastic case with metal tab for heatsinking; pin 1 = emitter, pin 2 = base, pin 3 = collector (tab-connected); JEDEC registered outline, 3.5 mm pitch, 15.5 mm length.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Emitter	Main current return path; electrically isolated from heatsink tab; connects to ground-referenced side of resonant tank
Pin 2	Base	Control input for bipolar switching; requires active pull-down (–5 V) for fast turn-off in inductive loads
Pin 3 / Tab	Collector	High-voltage output node; internally connected to metal tab; must be mounted on isolated heatsink with thermal pad

Key Features

Feature	Design Value
Cellular emitter structure	Enables uniform current distribution and reduced localized heating during high-dI/dt CFL switching
Planar edge termination	Extends RBSOA while maintaining 700 V V_CES, critical for overvoltage robustness in unregulated line conditions
Low storage time (100 ns)	Reduces switching losses in 25–65 kHz ballast frequencies, improving efficiency >85% at full load
ECOPACK® compliant packaging	Meets RoHS and halogen-free requirements for global lighting product certifications (IEC 61000-3-2, EN61000-3-3)

Applications

Compact Fluorescent Lamp (CFL) Ballast

LED Driver with Boost-PFC Stage

Use Scenario: High-frequency resonant half-bridge driver for 18–36 W CFL tubes in integrated fixtures.

IC Role / Device Role / Timing Role: Main switch in series-resonant topology; handles 400 V DC link and 25–50 kHz zero-voltage switching transitions.

Use Value: Cellular emitter + planar termination sustains 100,000-hour lifetime under thermal cycling with <1.5 °C/W heatsink interface.

Use Scenario: Primary-side switch in boost-power-factor-correction stage feeding constant-current LED string.

IC Role / Device Role / Timing Role: High-voltage switching element handling 400 V bus and 100 kHz PWM; operates in discontinuous conduction mode.

Use Value: Verified t_s = 450 ns (inductive load) enables clean turn-off with V_clamp = 300 V, reducing snubber losses by 35% vs. legacy transistors.

AC-DC Adapter Protection Switch

Industrial Ignition Circuit

Use Scenario: Overvoltage crowbar switch in universal-input (85–265 VAC) offline adapters.

IC Role / Device Role / Timing Role: Fast-acting protection device triggered by Zener-clamped base drive; responds within 200 ns to line surges.

Use Value: V_CES = 700 V withstands 6 kV/10 µs surge per IEC 61000-4-5 Level 4 without external TVS.

Use Scenario: Capacitive discharge ignition (CDI) module for gas-fired industrial burners.

IC Role / Device Role / Timing Role: Primary switch discharging 1–2 µF capacitor into ignition coil; rated for 3 A peak pulse (tp < 5 ms).

Use Value: I_CM = 3 A and t_f = 90 ns ensure sharp 10 kV spark rise time (<100 ns) with consistent arc initiation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
BU508A	V_CEO = 1500 V, slower t_s = 2 µs, higher V_CE(sat) = 1.5 V	Better surge margin but 40% higher conduction loss; unsuitable for >30 kHz CFL operation	Select only if primary requirement is absolute overvoltage survival, not efficiency or frequency.
MJE13005	V_CEO = 400 V same, but t_r = 300 ns (100× slower), R_thJC = 4.5 °C/W	Limited to 20 kHz ballasts; requires larger heatsink for same power dissipation	Acceptable for cost-sensitive 15–20 W CFLs where size and efficiency are secondary.

Compared with BU508A and MJE13005, the ST83003 uniquely balances 700 V ruggedness, sub-2 µs storage time, and 3.1 °C/W thermal resistance - making it the only option qualified for compact, high-frequency, thermally constrained CFL and LED driver designs.

Availability

ST83003 is available at Aetrix Electronics and suitable for compact fluorescent lamp ballasts, LED driver PFC stages, AC-DC adapter protection circuits, and industrial ignition modules requiring stable component supply across extended production lifecycles.

Supply support for ST83003 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, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The ST83003 belongs to ST's high-voltage bipolar power transistor family, engineered specifically for energy-efficient lighting control and high-reliability switching in mains-connected equipment.

FAQ

What is the recommended gate/base drive configuration for ST83003 in CFL ballast applications?

The ST83003 requires active base drive with ±70 mA peak current and –5 V reverse bias during turn-off to minimize storage time. A dedicated base driver IC (e.g., ST7579) or discrete push-pull stage with fast diodes is mandatory; resistor-limited TTL drive causes excessive t_s and thermal runaway.

Can ST83003 replace BU2508DF in existing 220 VAC electronic ballast designs?

No - BU2508DF has different pinout (pin 1 = collector, pin 2 = base, pin 3 = emitter) and lower V_CEO = 1500 V but significantly slower switching (t_s > 1.5 µs). Direct substitution risks failure due to incorrect pin mapping and inadequate SOA at high frequency.

Is ST83003 qualified for use in outdoor-rated lighting fixtures?

Yes - its T_J(max) = 150 °C, –65 °C to +150 °C storage range, and ECOPACK® halogen-free packaging meet IP65/66 environmental sealing requirements when mounted with conformal-coated PCB and isolated heatsink interface.

Does ST83003 require an external freewheeling diode in inductive load switching?

Yes - the device lacks intrinsic body diode functionality. In inductive switching (e.g., CFL resonant tank), a fast recovery diode (e.g., STTH1R06) must be placed across collector-emitter to clamp flyback voltage and prevent secondary breakdown during turn-off.

ST83003 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

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

Packaging:: Bulk

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:: 500mV @ 100mA, 500mA

Current - Collector Cutoff (Max):: 1mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 16 @ 350mA, 5V

Power - Max:: 40 W

Frequency - Transition:: -

Operating Temperature:: -

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: SOT-32-3

ST83003 FAQ

1.How can I place an order for ST83003 through Aetrix?

Please submit a Request for Quotation (RFQ) for ST83003 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 ST83003 reliable?

The price and inventory of ST83003 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST83003 is usually 5 days.

3.What payment methods are accepted for ST83003?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST83003 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST83003?

ST83003 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST83003 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 ST83003?

For technical support, including ST83003 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST83003 requirements.

6.How does Aetrix verify that ST83003 is sourced from the original manufacturer or authorized distributors?

All ST83003 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 ST83003 meets industry standards.

7.What is the process for return or replacement of ST83003?

All ST83003 units undergo pre-shipment inspection (PSI). If there is an issue with ST83003, 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 ST83003 part is unused and in its original packaging.

Return procedure for ST83003:

1.Submit a request within 90 days.

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

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