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

onsemi KSE13003H2ASTU

Name: KSE13003H2ASTU
Brand: onsemi
SKU: KSE13003H2ASTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSE13003H2ASTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: KSE13003H2ASTU.pdf

Description:: TRANS NPN 400V 1.5A TO-126-3

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Product details

Overview

KSE13003H2ASTU from ON Semiconductor is an NPN silicon power transistor designed for high-voltage switching applications, featuring V_CEO = 400 V, I_C = 1.5 A (DC), P_C = 20 W at T_C = 25°C, and h_FE = 14–21 (at V_CE = 2 V, I_C = 0.5 A). It is used in switch-mode power supplies, motor control circuits, and DC-DC converters where robust high-voltage gain and fast switching are required.

For engineers reviewing the KSE13003H2ASTU datasheet, pinout, applications, or equivalent options, key selection considerations include its TO-126 package thermal performance, h_FE classification H2, saturation voltage behavior under 1.5 A load, and safe operating area limitations at elevated case temperatures.

Technical Context

The KSE13003H2ASTU operates as a medium-power NPN bipolar junction transistor optimized for linear and switching operation in high-voltage DC circuits. Its design supports V_CBO = 700 V and V_CEO = 400 V, enabling use in off-line SMPS primary-side switching stages and industrial relay drivers.

It delivers f_T = 4 MHz and exhibits t_ON/t_STG/t_F = 1.1/4.0/0.7 ms under standardized 125 V, 1 A resistive switching conditions - confirming suitability for low-to-moderate frequency (<100 kHz) hard-switched topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Maximum collector-emitter voltage before breakdown; defines upper limit for flyback snubber or boost converter output stage selection.
I_C (DC)	1.5 A - Continuous collector current rating; sets maximum steady-state load capability with adequate heatsinking at T_C ≤ 25°C.
P_C	20 W - Power dissipation at T_C = 25°C; requires thermal derating above 25°C per published curve (e.g., ~0.16 W/°C above 25°C).
h_FE (H2)	14–21 - DC current gain range at V_CE = 2 V, I_C = 0.5 A; determines base drive requirements for saturated switching.
V_CE(sat)	1.0 V max at I_C = 1 A, I_B = 0.25 A - Defines conduction loss in saturated mode; impacts efficiency and thermal design in linear regulators or PWM drivers.
f_T	4 MHz - Current-gain bandwidth product; limits usable frequency range in analog amplification or high-speed switching feedback paths.

Pinout & Package

Package: TO-126 (3-lead, plastic, through-hole), with emitter (pin 1), collector (pin 2), and base (pin 3) arranged linearly. Mounting tab is electrically connected to collector.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for majority carriers	Low-impedance return node; often tied to ground or low-side reference in common-emitter configurations.
2 (Collector)	Current entry path; connected to mounting tab	High-voltage, high-current terminal; requires isolation from heatsink unless electrically referenced to same potential.
3 (Base)	Control electrode for minority carrier injection	Requires current-limited drive (I_B ≤ 0.75 A); sensitive to ESD and overvoltage due to thin oxide layer.

Key Features

Feature	Design Value
High-voltage blocking capability	V_CBO = 700 V enables use in 380 V AC rectified bus applications without additional clamping.
Controlled h_FE classification	H2 bin (14–21) ensures predictable base drive sizing across production lots for consistent switching timing.
TO-126 thermal interface	Tab-connected collector allows direct mechanical and thermal attachment to heatsinks with electrical isolation via mica or sil-pad.
Fast switching performance	t_ON/t_STG/t_F ≤ 1.1/4.0/0.7 ms supports reliable operation up to ~50 kHz in hard-switched converters.

Applications

Switch-Mode Power Supply (SMPS)	DC Motor Control
Use Scenario: Primary-side switching transistor in 20–60 W offline flyback or forward converters. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer from primary winding; driven by UC3842 or similar PWM controller. Use Value: 400 V V_CEO withstands reflected output voltage plus leakage spike; 1.5 A I_C supports typical peak currents in sub-100 W designs.	Use Scenario: Low-frequency H-bridge or single-ended driver for brushed DC motors (12–48 V, <2 A). IC Role / Device Role / Timing Role: Power stage switch in discrete half-bridge configuration; operated in saturation for minimal conduction loss. Use Value: V_CE(sat) ≤ 1.0 V at 1 A reduces heat generation; TO-126 package enables bolt-down heatsinking for intermittent duty cycles.
Inductive Load Driver	High-Voltage Relay Interface
Use Scenario: Driving solenoids, transformers, or contactor coils rated up to 300 V DC. IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to inductive load; paired with freewheeling diode. Use Value: 700 V V_CBO accommodates large inductive kickback; 20 W P_C allows short-duration surge handling without thermal runaway.	Use Scenario: Isolated control of industrial relays or solid-state relays requiring >250 V hold-off. IC Role / Device Role / Timing Role: Level-shifting interface between logic-level controller and high-voltage relay coil supply. Use Value: 400 V V_CEO ensures reliable turn-off under full-rated coil voltage; H2 h_FE simplifies base resistor calculation for stable activation.

Switch-Mode Power Supply (SMPS)

DC Motor Control

Use Scenario: Primary-side switching transistor in 20–60 W offline flyback or forward converters.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer from primary winding; driven by UC3842 or similar PWM controller.

Use Value: 400 V V_CEO withstands reflected output voltage plus leakage spike; 1.5 A I_C supports typical peak currents in sub-100 W designs.

Use Scenario: Low-frequency H-bridge or single-ended driver for brushed DC motors (12–48 V, <2 A).

IC Role / Device Role / Timing Role: Power stage switch in discrete half-bridge configuration; operated in saturation for minimal conduction loss.

Use Value: V_CE(sat) ≤ 1.0 V at 1 A reduces heat generation; TO-126 package enables bolt-down heatsinking for intermittent duty cycles.

Inductive Load Driver

High-Voltage Relay Interface

Use Scenario: Driving solenoids, transformers, or contactor coils rated up to 300 V DC.

IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to inductive load; paired with freewheeling diode.

Use Value: 700 V V_CBO accommodates large inductive kickback; 20 W P_C allows short-duration surge handling without thermal runaway.

Use Scenario: Isolated control of industrial relays or solid-state relays requiring >250 V hold-off.

IC Role / Device Role / Timing Role: Level-shifting interface between logic-level controller and high-voltage relay coil supply.

Use Value: 400 V V_CEO ensures reliable turn-off under full-rated coil voltage; H2 h_FE simplifies base resistor calculation for stable activation.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE13003	Same TO-126 package; V_CEO = 400 V, I_C = 1.5 A, but h_FE binning not specified; f_T = 4 MHz identical.	No guaranteed h_FE classification; less predictable base drive requirement in production.	Acceptable where h_FE tolerance is relaxed and cost sensitivity outweighs gain consistency.
KSC2690A	TO-126; V_CEO = 400 V, I_C = 1.5 A, but h_FE = 10–20 (lower min), V_CE(sat) = 1.2 V max at same conditions.	Slightly higher saturation voltage increases conduction loss; lower h_FE min demands stronger base drive.	Use only if layout allows increased base current and thermal margin accommodates +0.2 V V_CE(sat).

Compared with KSE13003H2ASTU, MJE13003 offers identical voltage/current ratings but lacks h_FE binning assurance, while KSC2690A trades slightly lower gain and higher V_CE(sat) for broader availability - both require revalidation of base drive network and thermal design.

Availability

KSE13003H2ASTU is available at Aetrix Electronics and suitable for switch-mode power supplies, DC motor controllers, inductive load drivers, and high-voltage relay interfaces requiring stable component supply and legacy-design continuity.

Supply support for KSE13003H2ASTU 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

ON Semiconductor is a global semiconductor manufacturer specializing in power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The KSE13003 series belongs to ON Semiconductor's legacy high-voltage bipolar transistor portfolio, engineered specifically for ruggedized switching applications in off-line power conversion and industrial control systems.

FAQ

What is the h_FE range for KSE13003H2ASTU?

The KSE13003H2ASTU has a guaranteed DC current gain (h_FE) range of 14 to 21 when measured at V_CE = 2 V and I_C = 0.5 A. This H2 classification ensures consistent base drive requirements across production units of the KSE13003H2ASTU, supporting reliable design of gate/base driver networks in switching applications.

Is KSE13003H2ASTU still in active production?

No - the KSE13003H2ASTU is marked as DISCONTINUED in official ON Semiconductor documentation. While Aetrix Electronics maintains limited legacy stock and supports continuity programs, new designs should consider validated alternatives such as MJE13003 or KSC2690A, and long-term supply must be confirmed directly with ON Semiconductor representatives for KSE13003H2ASTU.

What package type does KSE13003H2ASTU use?

The KSE13003H2ASTU uses the TO-126 package - a 3-lead, through-hole plastic power package with the collector internally connected to the metal mounting tab. The "STU" suffix confirms short-lead variant and tube packaging, as documented in Fairchild/ON Semiconductor ordering information for the KSE13003H2ASTU.

Can KSE13003H2ASTU replace KSE13003H1ASTU or KSE13003H3ASTU?

Yes - KSE13003H2ASTU is functionally interchangeable with KSE13003H1ASTU and KSE13003H3ASTU in the same TO-126 package, differing only in h_FE binning (H1: 9–16, H2: 14–21, H3: 19–26). Circuit compatibility depends on base drive strength; KSE13003H2ASTU provides mid-range gain ideal for designs requiring balance between drive simplicity and saturation margin.

What is the maximum safe operating temperature for KSE13003H2ASTU?

The KSE13003H2ASTU has a maximum junction temperature (T_J) of 150°C and a storage temperature range of –65°C to +150°C. Safe continuous operation requires maintaining case temperature (T_C) ≤ 25°C for full 20 W dissipation, with linear derating applied above that point - e.g., ~0.16 W/°C reduction - per the published power derating curve for the KSE13003H2ASTU.

KSE13003H2ASTU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tube

Product Status:: Active

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):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 14 @ 500mA, 2V

Power - Max:: 20 W

Frequency - Transition:: 4MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126-3

KSE13003H2ASTU FAQ

1.How can I place an order for KSE13003H2ASTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSE13003H2ASTU 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 KSE13003H2ASTU reliable?

The price and inventory of KSE13003H2ASTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSE13003H2ASTU is usually 5 days.

3.What payment methods are accepted for KSE13003H2ASTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSE13003H2ASTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSE13003H2ASTU?

KSE13003H2ASTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSE13003H2ASTU 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 KSE13003H2ASTU?

For technical support, including KSE13003H2ASTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSE13003H2ASTU requirements.

6.How does Aetrix verify that KSE13003H2ASTU is sourced from the original manufacturer or authorized distributors?

All KSE13003H2ASTU 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 KSE13003H2ASTU meets industry standards.

7.What is the process for return or replacement of KSE13003H2ASTU?

All KSE13003H2ASTU units undergo pre-shipment inspection (PSI). If there is an issue with KSE13003H2ASTU, 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 KSE13003H2ASTU part is unused and in its original packaging.

Return procedure for KSE13003H2ASTU:

1.Submit a request within 90 days.

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

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