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onsemi KSE13003AS
- Part No.:
- KSE13003AS
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-225AA, TO-126-3
- Datasheet:
-
KSE13003AS.pdf
- Description:
- TRANS NPN 400V 1.5A TO-126-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,753
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Product details
Overview
KSE13003AS from ON Semiconductor is an NPN silicon power transistor designed for high-voltage switching applications, featuring VCEO = 400 V, IC = 1.5 A (DC), PC = 20 W at TC = 25°C, and fT = 4 MHz. It serves as a primary switch in offline SMPS, DC-DC converters, and motor control circuits where robust voltage handling and fast turn-on/turn-off are required.
For engineers reviewing the KSE13003AS datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-126 package thermal performance, hFE classification (H1–H3 variants), VCE(sat) at 1.5 A, safe operating area (SOA) limits, and compatibility with flyback and forward converter topologies requiring 400 V blocking capability.
Technical Context
The KSE13003AS operates as a single NPN bipolar junction transistor optimized for high-voltage, medium-current switching. Its structure supports VCBO = 700 V and VCEO = 400 V, enabling use in primary-side switching of universal-input AC/DC supplies up to 265 VAC.
It delivers tON = 1.1 ms, tSTG = 4.0 ms, and tF = 0.7 ms under standardized 125 V / 1 A test conditions, with Cob = 21 pF at VCB = 10 V, supporting stable high-frequency operation in <100 kHz SMPS designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 400 V - Enables direct use in 265 VAC input rectified rails without snubber overdesign |
| IC (DC) | 1.5 A - Supports continuous output power up to ~60 W in flyback converters with proper heatsinking |
| PC @ TC = 25°C | 20 W - Requires minimum 1.5 cm² copper pour on PCB or external heatsink for sustained operation |
| hFE @ IC = 0.5 A | 9–26 (H1–H3) - Determines base drive current requirement: 19–50 mA typical for 1 A collector current |
| VCE(sat) @ IC = 1.5 A | ≤3 V - Limits conduction loss to ≤4.5 W at full load, critical for thermal budgeting |
| fT | 4 MHz - Sufficient for <100 kHz switching; not suitable for MHz-range resonant topologies |
Pinout & Package
Package: TO-126 (3-lead, plastic, through-hole). Standard mounting orientation with emitter (pin 1), collector (pin 2), and base (pin 3) labeled on device body per Fairchild marking convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current exit path from transistor | Connected to ground or low-side return; must handle full load current and be routed with low-inductance trace |
| 2 (Collector) | High-voltage current input node | Interfaces directly with transformer primary or bus rail; requires creepage/clearance ≥4 mm for 400 V isolation |
| 3 (Base) | Control terminal for BJT conduction | Driven by optocoupler or PWM controller; requires series resistor to limit IB ≤ 0.75 A peak |
Key Features
| Feature | Design Value |
|---|---|
| High breakdown voltage | VCBO = 700 V ensures margin against voltage spikes in unregulated line-switching applications |
| Fast switching capability | tON/tF ≤ 1.1/0.7 ms enables efficient operation in 20–100 kHz SMPS without excessive switching loss |
| TO-126 thermal interface | Case-to-ambient θJA ≈ 65°C/W (with 1 in² copper) allows cost-effective thermal management vs. TO-220 |
| hFE binning (H1/H2/H3) | Enables consistent base drive design across production lots; H3 variant reduces driver stage component count |
Applications
| Offline AC/DC Adapters | Industrial Motor Starters |
|---|---|
Use Scenario: 12–24 V output, 30–60 W flyback converter for consumer electronics power supplies. IC Role / Device Role / Timing Role: Primary-side switching transistor controlling energy transfer during each PWM cycle. Use Value: 400 V VCEO accommodates 375 V DC link with 25% safety margin; SOA curve supports 1.5 A peak current at 200 V. | Use Scenario: Low-cost 120 V AC motor starter for fans, pumps, and compressors. IC Role / Device Role / Timing Role: High-side switch in relay replacement circuit with zero-crossing trigger logic. Use Value: 700 V VCBO withstands inductive kickback; TO-126 package fits compact PCB layouts without forced air cooling. |
| LED Driver Power Stages | DC-DC Boost Converters |
Use Scenario: Constant-current LED driver for street lighting using buck-boost topology. IC Role / Device Role / Timing Role: Main switching element regulating average LED current via duty-cycle control. Use Value: VCE(sat) ≤ 3 V at 1.5 A minimizes conduction loss in high-current strings; hFE stability ensures predictable dimming response. | Use Scenario: 12 V to 48 V boost converter in telecom power systems. IC Role / Device Role / Timing Role: Energy storage switch synchronizing with diode conduction phase. Use Value: Cob = 21 pF reduces capacitive gate drive loss; fT = 4 MHz supports stable loop compensation below 100 kHz. |
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 VCEO = 400 V, IC = 1.5 A, but TO-220 package; higher PC = 40 W; no hFE binning | Requires larger PCB footprint and heatsink; better suited for >60 W designs with active cooling | Select when higher power dissipation or mechanical robustness is prioritized over board space |
| BU508AF | VCEO = 1500 V, IC = 10 A, TO-3P package; significantly higher Cob (100 pF); slower switching | Targeted at high-power industrial inverters; unsuitable for >50 kHz due to tF > 2 µs | Choose only for ultra-high-voltage legacy designs where 1500 V rating is mandatory |
Compared with MJE13003 and BU508AF, the KSE13003AS offers optimal balance of voltage rating, thermal efficiency in TO-126, and hFE consistency-making it preferred for space-constrained, 30–60 W offline SMPS where layout density and predictable drive requirements matter most.
Availability
KSE13003AS is available at Aetrix Electronics and suitable for offline AC/DC adapters, industrial motor starters, LED driver power stages, and DC-DC boost converters requiring stable component supply and long-term BOM continuity.
Supply support for KSE13003AS 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 discrete solutions for automotive, industrial, cloud, and IoT applications.
The KSE13003AS belongs to ON Semiconductor's legacy high-voltage BJT portfolio, originally developed by Fairchild for cost-sensitive, high-reliability switching applications in consumer and industrial power supplies.
FAQ
What is the package type and pin configuration of the KSE13003AS?
The KSE13003AS uses a TO-126 plastic through-hole package with three leads: pin 1 is emitter, pin 2 is collector, and pin 3 is base-consistent with standard Fairchild/ON Semiconductor marking. The flat side of the package faces the viewer, with pins numbered left-to-right. This configuration is verified in the official KSE13003 Rev. 2 datasheet and confirmed on ON Semiconductor's product page for KSE13003AS.
Is the KSE13003AS still in active production?
No-the KSE13003AS is officially discontinued per ON Semiconductor documentation. The datasheet states "DISCONTINUED / THIS DEVICE IS NOT AVAILABLE" and directs users to contact an ON Semiconductor representative. However, Aetrix Electronics maintains limited legacy inventory and provides lifecycle support including cross-reference guidance and obsolescence mitigation for the KSE13003AS.
What does the "AS" suffix mean in KSE13003AS?
The "AS" suffix in KSE13003AS indicates the TO-126 short-lead variant with tube packaging, as defined in Fairchild's ordering information notes. It corresponds to the same die and electrical specifications as KSE13003, but with reduced lead length for automated insertion and tighter pitch tolerance-critical for high-density wave-soldered assemblies.
How does hFE classification affect KSE13003AS performance?
The KSE13003AS is offered in H1 (hFE = 9–16), H2 (14–21), and H3 (19–26) bins at VCE = 2 V and IC = 0.5 A. Higher hFE reduces required base drive current: H3 enables ~25 mA base current for 1 A collector flow, improving driver efficiency and reducing heat in optocoupler-based feedback loops for the KSE13003AS.
Can the KSE13003AS replace the KSE13005 in existing designs?
No-the KSE13005 has VCEO = 500 V and IC = 4 A, making it electrically incompatible with the KSE13003AS (VCEO = 400 V, IC = 1.5 A). Substituting the KSE13003AS risks premature failure under 500 V stress or thermal overload at 4 A. Design validation for the KSE13003AS must assume its rated 400 V/1.5 A limits-not those of the KSE13005.
KSE13003AS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- 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:
- 3V @ 500mA, 1.5A
- Current - Collector Cutoff (Max):
- -
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 8 @ 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
KSE13003AS FAQ
1.How can I place an order for KSE13003AS through Aetrix?
Please submit a Request for Quotation (RFQ) for KSE13003AS 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 KSE13003AS reliable?
The price and inventory of KSE13003AS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for KSE13003AS is usually 5 days.
3.What payment methods are accepted for KSE13003AS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for KSE13003AS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for KSE13003AS?
KSE13003AS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your KSE13003AS 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 KSE13003AS?
For technical support, including KSE13003AS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your KSE13003AS requirements.
6.How does Aetrix verify that KSE13003AS is sourced from the original manufacturer or authorized distributors?
All KSE13003AS 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 KSE13003AS meets industry standards.
7.What is the process for return or replacement of KSE13003AS?
All KSE13003AS units undergo pre-shipment inspection (PSI). If there is an issue with KSE13003AS, 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 KSE13003AS part is unused and in its original packaging.
Return procedure for KSE13003AS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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