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

onsemi KSE13003H3ASTU

Name: KSE13003H3ASTU
Brand: onsemi
SKU: KSE13003H3ASTU
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: KSE13003H3ASTU

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: KSE13003H3ASTU.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

KSE13003H3ASTU from ON Semiconductor (formerly Fairchild) is an NPN silicon power transistor in TO-126 package, rated for 400 V V_CEO, 1.5 A DC collector current, and 20 W power dissipation at T_C = 25°C, designed for high-voltage switching regulator and motor control applications.

For engineers reviewing the KSE13003H3ASTU datasheet, pinout, applications, or equivalent options, key selection criteria include h_FE classification (H3: 19–26), V_CE(sat) ≤ 1 V at I_C = 1 A / I_B = 0.25 A, switching times (t_ON = 1.1 ms, t_F = 0.7 ms), and TO-126 thermal performance under pulsed load conditions.

Technical Context

The KSE13003H3ASTU is a high-voltage, medium-power NPN bipolar junction transistor optimized for hard-switching in offline SMPS and DC motor drives. Its 400 V V_CEO rating supports operation across universal AC input ranges, while its 150°C maximum junction temperature enables reliable thermal margin in compact heatsinked designs.

It features a defined h_FE range of 19–26 at V_CE = 2 V and I_C = 0.5 A, low saturation voltage (V_CE(sat) ≤ 1 V @ I_C = 1 A), and output capacitance (C_ob = 21 pF @ V_CB = 10 V), supporting efficient switching with controlled turn-off energy and reduced capacitive losses.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	400 V - Supports direct rectified AC line switching up to 280 V RMS without derating.
I_C (DC)	1.5 A - Sustains continuous motor winding or SMPS primary-side current in TO-126 package.
P_C @ T_C = 25°C	20 W - Enables ~12 W usable power at 85°C case temperature with standard heatsinking.
h_FE (H3 class)	19–26 - Ensures predictable base drive requirements for stable current gain in linear and switching modes.
V_CE(sat)	≤1 V @ I_C=1 A, I_B=0.25 A - Limits conduction loss to ≤1 W per device in saturated switch operation.
t_F	0.7 ms - Defines minimum off-time for PWM control in <1 kHz motor commutation or flyback reset cycles.

Pinout & Package

Package: TO-126 (3-lead, plastic, through-hole, short leads, tube-packed). Pin 1 = Emitter, Pin 2 = Collector, Pin 3 = Base - thermally enhanced leadframe with collector internally connected to tab for heatsink mounting.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path	Low-impedance emitter connection; referenced to ground or negative rail in common-emitter configurations.
2 (Collector)	Current entry path	Internally bonded to metal tab; must be electrically isolated from heatsink unless circuit design permits collector-to-chassis connection.
3 (Base)	Control terminal	Requires current-limited drive (I_B ≤ 0.75 A); base resistor sizing must ensure I_B ≥ I_C/h_FE(min) for full saturation.

Key Features

Feature	Design Value
High breakdown voltage	V_CEO = 400 V enables use in 230 VAC offline SMPS without snubber complexity.
H3 h_FE binning	Guaranteed 19–26 gain reduces base drive variability across production lots.
TO-126 thermal interface	Collector-tab mounting allows direct heatsink attachment for 20 W dissipation with minimal thermal resistance.
Fast switching capability	t_ON/t_F ≤ 1.1/0.7 ms supports PWM frequencies up to ~500 Hz in motor control without excessive switching loss.

Applications

Switching Regulator Primary Switch	DC Motor Drive (Brushed)
Use Scenario: Used as main switching element in 20–50 W flyback or forward converter topologies operating directly from rectified AC line. IC Role / Device Role / Timing Role: Power switch controlling energy transfer during on-time; operates in saturated (low-V_CE) and cutoff (high-V_CE) states. Use Value: 400 V rating eliminates need for voltage clamping in 230 VAC systems; 20 W dissipation supports compact transformerless designs.	Use Scenario: H-bridge or half-bridge driver for 12–48 V brushed DC motors in industrial actuators or power tools. IC Role / Device Role / Timing Role: High-side or low-side current switch enabling bidirectional torque control via PWM duty cycle. Use Value: 1.5 A DC current and 3 A pulse rating accommodate motor stall currents; TO-126 tab simplifies heatsinking in space-constrained enclosures.
Induction Heater Half-Bridge	Capacitor Discharge Ignition (CDI)
Use Scenario: One leg of a resonant half-bridge driving induction coils in small-scale heating systems (e.g., soldering irons). IC Role / Device Role / Timing Role: Hard-switched power transistor synchronized with complementary device; handles high dV/dt during zero-voltage switching transitions. Use Value: 700 V V_CBO withstands voltage spikes from leakage inductance; 21 pF C_ob minimizes gate drive loading in resonant gate circuits.	Use Scenario: Primary-side switch discharging high-voltage capacitor into ignition coil for spark generation in small engines. IC Role / Device Role / Timing Role: Fast-turn-on switch triggered by microcontroller or analog timing circuit; conducts high peak current for <1 ms. Use Value: 3 A pulse rating and 1.1 ms t_ON support reliable spark timing; 150°C T_J rating accommodates intermittent high-power bursts.

Switching Regulator Primary Switch

DC Motor Drive (Brushed)

Use Scenario: Used as main switching element in 20–50 W flyback or forward converter topologies operating directly from rectified AC line.

IC Role / Device Role / Timing Role: Power switch controlling energy transfer during on-time; operates in saturated (low-V_CE) and cutoff (high-V_CE) states.

Use Value: 400 V rating eliminates need for voltage clamping in 230 VAC systems; 20 W dissipation supports compact transformerless designs.

Use Scenario: H-bridge or half-bridge driver for 12–48 V brushed DC motors in industrial actuators or power tools.

IC Role / Device Role / Timing Role: High-side or low-side current switch enabling bidirectional torque control via PWM duty cycle.

Use Value: 1.5 A DC current and 3 A pulse rating accommodate motor stall currents; TO-126 tab simplifies heatsinking in space-constrained enclosures.

Induction Heater Half-Bridge

Capacitor Discharge Ignition (CDI)

Use Scenario: One leg of a resonant half-bridge driving induction coils in small-scale heating systems (e.g., soldering irons).

IC Role / Device Role / Timing Role: Hard-switched power transistor synchronized with complementary device; handles high dV/dt during zero-voltage switching transitions.

Use Value: 700 V V_CBO withstands voltage spikes from leakage inductance; 21 pF C_ob minimizes gate drive loading in resonant gate circuits.

Use Scenario: Primary-side switch discharging high-voltage capacitor into ignition coil for spark generation in small engines.

IC Role / Device Role / Timing Role: Fast-turn-on switch triggered by microcontroller or analog timing circuit; conducts high peak current for <1 ms.

Use Value: 3 A pulse rating and 1.1 ms t_ON support reliable spark timing; 150°C T_J rating accommodates intermittent high-power bursts.

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
MJE13003G	Same TO-126 package; h_FE = 8–16 (unbinned), V_CEO = 400 V, P_C = 15 W.	Lower power dissipation limits continuous current to ~1.2 A at 85°C case; less suitable for sustained motor loads.	Select when cost sensitivity outweighs gain consistency and thermal headroom.
ST13003	TO-126; V_CEO = 400 V, I_C = 1.5 A, but h_FE = 10–20 (no H-class binning), P_C = 18 W.	Slightly lower thermal capability and wider h_FE spread increases base drive design margin requirement.	Choose for legacy compatibility where H3 binning is not required and 2 W lower dissipation is acceptable.

Compared with MJE13003G and ST13003, the KSE13003H3ASTU provides tighter h_FE control (19–26), higher power rating (20 W vs. 15–18 W), and guaranteed performance for thermally demanding, high-reliability switching regulator and motor control designs.

Availability

KSE13003H3ASTU is available at Aetrix Electronics and suitable for switching regulator primary switches, brushed DC motor drivers, induction heater half-bridges, and capacitor discharge ignition systems requiring stable component supply despite end-of-life status.

Supply support for KSE13003H3ASTU 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 (formerly Fairchild Semiconductor) is a global supplier of energy-efficient semiconductor components, specializing in power management, analog, and discrete devices for automotive, industrial, and consumer markets.

The KSE13003 series belongs to ON Semiconductor's high-voltage bipolar transistor product line, engineered specifically for robust, cost-effective switching in offline power supplies and electromechanical control systems.

FAQ

What is the h_FE range for KSE13003H3ASTU?

The KSE13003H3ASTU is binned to the H3 classification, with a guaranteed DC current gain (h_FE) of 19 to 26 when measured at V_CE = 2 V and I_C = 0.5 A. This tight gain range ensures consistent base drive requirements across production units, reducing design margin overhead in critical switching applications.

Is KSE13003H3ASTU still in active production?

No - the KSE13003H3ASTU is officially discontinued per ON Semiconductor documentation. However, Aetrix Electronics maintains limited legacy inventory and supports traceable sourcing with full documentation for ongoing production programs requiring this specific h_FE-binned variant.

What package type does KSE13003H3ASTU use?

The KSE13003H3ASTU uses the TO-126 package with short leads and tube packing (denoted by "-STU"). Pin 1 is Emitter, Pin 2 is Collector (internally connected to the metal tab), and Pin 3 is Base - enabling direct heatsink mounting with electrical isolation for thermal management in high-power switching circuits.

Can KSE13003H3ASTU replace KSE13003H1ASTU or KSE13003H2ASTU?

Yes - the KSE13003H3ASTU is pin-compatible and electrically interchangeable with other KSE13003 variants (H1/H2) in the same TO-126-STU package. The only functional difference is the h_FE range: H3 (19–26) offers higher and tighter gain than H1 (9–16) or H2 (14–21), allowing reduced base drive current in saturation-critical designs.

What is the maximum safe operating area (SOA) limit for KSE13003H3ASTU?

The KSE13003H3ASTU SOA curve (per datasheet Figure 5) defines safe simultaneous V_CE and I_C limits at T_C = 25°C. At 100 V V_CE, it supports up to ~1.2 A DC; at 200 V, ≤0.6 A. Derating is required above 25°C case temperature - e.g., at 85°C, maximum DC current drops to ~0.9 A at 100 V, ensuring long-term reliability without secondary breakdown.

KSE13003H3ASTU Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

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:: 3V @ 500mA, 1.5A

Current - Collector Cutoff (Max):: -

DC Current Gain (hFE) (Min) @ Ic, Vce:: 19 @ 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

KSE13003H3ASTU FAQ

1.How can I place an order for KSE13003H3ASTU through Aetrix?

Please submit a Request for Quotation (RFQ) for KSE13003H3ASTU 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 KSE13003H3ASTU reliable?

The price and inventory of KSE13003H3ASTU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSE13003H3ASTU is usually 5 days.

3.What payment methods are accepted for KSE13003H3ASTU?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSE13003H3ASTU transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for KSE13003H3ASTU?

KSE13003H3ASTU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your KSE13003H3ASTU 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 KSE13003H3ASTU?

For technical support, including KSE13003H3ASTU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSE13003H3ASTU requirements.

6.How does Aetrix verify that KSE13003H3ASTU is sourced from the original manufacturer or authorized distributors?

All KSE13003H3ASTU 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 KSE13003H3ASTU meets industry standards.

7.What is the process for return or replacement of KSE13003H3ASTU?

All KSE13003H3ASTU units undergo pre-shipment inspection (PSI). If there is an issue with KSE13003H3ASTU, 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 KSE13003H3ASTU part is unused and in its original packaging.

Return procedure for KSE13003H3ASTU:

1.Submit a request within 90 days.

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

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