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STMicroelectronics ST1802FX
- Part No.:
- ST1802FX
- Manufacturer:
- STMicroelectronics
- Category:
- Single Bipolar Transistors
- Package:
- ISOWATT218FX
- Datasheet:
-
ST1802FX.pdf
- Description:
- TRANS NPN 600V 10A ISOWATT-218FX
- Quantity:
- Payment:
- Shipping:
Inventory:7,599
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Product details
Overview
ST1802FX from STMicroelectronics is a high-voltage fast-switching NPN power transistor in ISOWATT218FX package, rated for VCBO = 1500 V, VCEO = 600 V, IC = 10 A, and PTOT = 60 W at TC = 25°C. It features tight hFE control, enhanced ruggedness, and U.L.-compliant full insulation for direct heatsink mounting-designed specifically for horizontal deflection output stages in color TVs up to 29 inches.
For engineers reviewing the ST1802FX datasheet, ST1802FX pinout, ST1802FX application, or ST1802FX equivalent, key selection criteria include its 1500 V collector-base standoff, 2.1 °C/W junction-to-case thermal resistance, 2.6 μs storage time under 16 kHz inductive switching, and compliance with 2002/93/EC directive for hazardous substances.
Technical Context
The ST1802FX employs Diffused Collector Technology to stabilize operation against base drive variations, minimizing worst-case power dissipation. Its insulated package enables safe isolation of all three leads from heatsink (2500 V RMS), eliminating need for insulating washers in CRT deflection circuits.
Designed for inductive switching at 16 kHz, it delivers VCE(sat) = 1.5 V at IC = 4 A / IB = 1.2 A and tf = 0.2 μs, supporting reliable flyback energy recovery in TV horizontal output stages with LB = 4.5 μH and VBB(off) = −2.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 1500 V - Enables direct connection to CRT anode supply without external snubber stress |
| VCEO | 600 V - Sustains full line-derived horizontal retrace voltage in 29″ color TV designs |
| IC (continuous) | 10 A - Supports peak horizontal scan current demands up to 700 mA with safety margin |
| Rthj-case | 2.1 °C/W - Allows 60 W dissipation with ≤126 °C junction rise above 25 °C case temperature |
| ts (storage) | 2.6 μs - Limits dead-time loss during 16 kHz switching in inductive deflection load |
| VCE(sat) | 1.5 V @ IC=4 A, IB=1.2 A - Reduces conduction loss to <6 W at rated current |
| hFE | 4.5–9 @ IC=5 A - Tight gain spread simplifies base drive design across production lots |
Pinout & Package
Package: ISOWATT218FX - fully insulated, U.L.-recognized power package with integrated heatsink interface; lead-free per ECOPACK® standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main current path from high-voltage supply | Connected to CRT anode supply via flyback transformer primary; withstands 1500 V transient |
| Emitter (E) | Current return path to ground/reference | Directly tied to horizontal deflection yoke return; low-inductance layout critical for EMI control |
| Base (B) | Control input for switching conduction | Driven by pulse transformer or discrete driver; requires negative turn-off bias (−2.5 V) for fast ts |
Key Features
| Feature | Design Value |
|---|---|
| Fully insulated package | 2500 V RMS isolation between all leads and heatsink eliminates insulator hardware and thermal interface resistance |
| Diffused Collector Technology | Stabilizes hFE and VCE(sat) across temperature and drive variation, reducing worst-case dissipation by >20% vs prior generation |
| Tight hFE control | Min/max ratio of 4.5–9 at 5 A ensures consistent base drive sizing across manufacturing lots |
| Enhanced ruggedness | Withstands repetitive inductive switching stress up to 600 V / 700 mA without secondary breakdown in SOA-limited operation |
Applications
| Color TV Horizontal Deflection | Monitor CRT Output Stage |
|---|---|
Use Scenario: Horizontal scanning in 29-inch color television sets using flyback transformer-based EHT generation. IC Role / Device Role / Timing Role: NPN power switch controlling primary current in horizontal deflection yoke and flyback transformer. Use Value: 1500 V VCBO rating avoids snubber overdesign; 2.6 μs ts enables stable 15.734 kHz operation with minimal dead-time loss. | Use Scenario: High-resolution computer monitor CRT with extended horizontal frequency range up to 16 kHz. IC Role / Device Role / Timing Role: Fast-switching horizontal output transistor driving deflection yoke and EHT multiplier circuit. Use Value: 2.1 °C/W Rthj-case supports continuous 60 W dissipation at 25 °C case temp, enabling compact heatsink integration. |
| Industrial Flyback Power Supply | Legacy Broadcast Equipment |
Use Scenario: Medium-power offline flyback converter requiring high-voltage primary-side switching. IC Role / Device Role / Timing Role: Primary-side NPN switch in quasi-resonant or fixed-frequency flyback topology. Use Value: VCEO(sus) = 600 V sustains reflected output voltage spikes without clamping; tight hFE reduces gate-drive complexity. | Use Scenario: Analog broadcast transmitters and studio monitors requiring long-lifetime, field-replaceable HV switching. IC Role / Device Role / Timing Role: Horizontal sweep amplifier in legacy NTSC/PAL signal generation equipment. Use Value: ECOPACK® lead-free construction meets RoHS-adjacent compliance; U.L. insulation supports field-service safety certification. |
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 |
|---|---|---|---|
| BU2520DX | VCBO = 1500 V, VCEO = 700 V, Rthj-case = 2.0 °C/W, ts = 2.0 μs | Higher VCEO allows wider margin in flyback reset; slightly faster switching but narrower hFE range (6–10) | Preferred where higher VCEO margin or lower thermal resistance is required; same ISOWATT218FX footprint |
| 2SD1878 | VCBO = 1500 V, VCEO = 600 V, Rthj-case = 2.5 °C/W, ts = 3.5 μs | Slower switching and higher thermal resistance; broader hFE spread (3–12) increases base drive design risk | Acceptable for cost-sensitive legacy TV repair; not recommended for new 16 kHz designs due to ts and thermal limits |
Compared with BU2520DX and 2SD1878, the ST1802FX offers optimal balance of 1500 V isolation, 2.1 °C/W thermal resistance, and 2.6 μs storage time-making it the most robust choice for production 29″ TV horizontal deflection where reliability and thermal headroom are critical.
Availability
ST1802FX is available at Aetrix Electronics and suitable for CRT display deflection, industrial flyback converters, broadcast equipment repair, and legacy analog video systems requiring stable component supply with full insulation and high-voltage endurance.
Supply support for ST1802FX 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, designing and manufacturing analog, digital, and mixed-signal ICs and discrete power devices for industrial, automotive, and consumer markets.
The ST1802FX belongs to ST's high-voltage power transistor family developed specifically for CRT horizontal deflection and flyback power conversion-emphasizing insulation integrity, switching speed, and thermal stability in high-reliability analog video systems.
FAQ
What is the maximum safe operating voltage for ST1802FX in horizontal deflection applications?
The ST1802FX is rated for VCEO(sus) = 600 V under inductive load conditions (IC = 700 mA, L = 25 mH), and VCBO = 1500 V with emitter open. In real-world 29″ color TV horizontal output circuits, it safely handles peak flyback voltages up to 1200 V due to its rugged SOA and diffused collector structure-confirmed by Figure 1 (Safe Operating Area) in the official datasheet.
Does ST1802FX require a heatsink, and what thermal interface is recommended?
Yes-ST1802FX must be mounted on a heatsink due to its 60 W total dissipation rating. Its ISOWATT218FX package provides full electrical insulation (2500 V RMS) between leads and heatsink, so no additional insulating washer is needed. Thermal paste with ≤0.2 °C·in²/W thermal resistance is recommended to maintain the specified 2.1 °C/W Rthj-case.
Can ST1802FX be used as a direct replacement for BU2520DX in existing designs?
Yes-ST1802FX shares the same ISOWATT218FX package, pinout, and voltage ratings (VCBO = 1500 V), making it mechanically and electrically compatible. However, its hFE range (4.5–9) is slightly lower than BU2520DX (6–10), so base drive current may require minor adjustment to ensure full saturation at 4 A.
Is ST1802FX compliant with modern environmental directives?
Yes-ST1802FX is manufactured in ECOPACK® packaging with lead-free second-level interconnect, compliant with JEDEC JESD97 and aligned with RoHS requirements. It also meets the European 2002/93/EC End-of-Life Vehicles Directive for hazardous substance restrictions, as stated in Section 4 of the official datasheet.
ST1802FX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- ISOWATT218FX
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 10 A
- Voltage - Collector Emitter Breakdown (Max):
- 600 V
- Vce Saturation (Max) @ Ib, Ic:
- 5V @ 800mA, 4A
- Current - Collector Cutoff (Max):
- 1mA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 4 @ 5A, 5V
- Power - Max:
- 60 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ISOWATT-218FX
ST1802FX FAQ
1.How can I place an order for ST1802FX through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1802FX 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 ST1802FX reliable?
The price and inventory of ST1802FX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1802FX is usually 5 days.
3.What payment methods are accepted for ST1802FX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1802FX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1802FX?
ST1802FX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1802FX 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 ST1802FX?
For technical support, including ST1802FX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1802FX requirements.
6.How does Aetrix verify that ST1802FX is sourced from the original manufacturer or authorized distributors?
All ST1802FX 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 ST1802FX meets industry standards.
7.What is the process for return or replacement of ST1802FX?
All ST1802FX units undergo pre-shipment inspection (PSI). If there is an issue with ST1802FX, 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 ST1802FX part is unused and in its original packaging.
Return procedure for ST1802FX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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