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STMicroelectronics ST2001FX
- Part No.:
- ST2001FX
- Manufacturer:
- STMicroelectronics
- Category:
- Single Bipolar Transistors
- Package:
- ISOWATT218FX
- Datasheet:
-
ST2001FX.pdf
- Description:
- TRANS NPN 600V 10A ISOWATT-218FX
- Quantity:
- Payment:
- Shipping:
Inventory:9,071
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Product details
Overview
ST2001FX from STMicroelectronics is a high-voltage fast-switching NPN power transistor in an ISOWATT218FX fully insulated package, rated for 1500 V VCBO, 600 V VCEO, and 10 A continuous collector current. It delivers tight hFE control (4.5–9 at IC = 6 A), low VCE(sat) of 1.5 V at 5 A/1.25 A drive, and sub-3 µs storage time for horizontal deflection in >21-inch color TVs and 15-inch monitors.
For engineers reviewing the ST2001FX datasheet, ST2001FX pinout, ST2001FX application, or ST2001FX equivalent, key selection criteria include insulation withstand voltage (2500 V RMS), thermal resistance (2 °C/W), ruggedness under inductive switching (LBB = 2 µH), and guaranteed VCEO(sus) of 600 V at IC = 100 mA.
Technical Context
This transistor uses diffused collector technology to stabilize operation against base drive variations, minimizing worst-case power dissipation in flyback and line-output stages. Its design targets high-reliability horizontal deflection circuits where sustained high-voltage blocking, rapid turn-off, and thermal robustness are critical.
The device operates with fixed-base drive conditions (IBon = 850 mA, VBB(off) = –2.5 V) and is characterized under pulsed test conditions (300 µs, 1.5% duty cycle) to reflect real-world TV scan-line switching behavior at 64 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 1500 V - Blocks full flyback voltage spikes in CRT horizontal output stages without breakdown. |
| VCEO(sus) | 600 V @ IC = 100 mA - Sustains rated collector-emitter voltage under active switching stress, not just DC. |
| IC / ICM | 10 A continuous / 20 A peak (tp < 5 ms) - Supports high-current sweep current pulses in large-screen CRTs. |
| VCE(sat) | 1.5 V @ IC = 5 A, IB = 1.25 A - Limits conduction loss to ≤7.5 W during on-state, reducing heatsink requirements. |
| ts / tf | 2.6 µs / 0.4 µs - Enables clean turn-off with minimal tail current, critical for stable 64 kHz horizontal retrace timing. |
| Rthj-case | 2 °C/W - Allows 63 W total dissipation at Tc = 25 °C; junction temperature stays ≤150 °C with modest heatsinking. |
| Vins | 2500 V RMS - Full isolation between all three leads and external heatsink meets UL safety standards for consumer CRT chassis mounting. |
Pinout & Package
Package: ISOWATT218FX - fully insulated, U.L.-compliant, screw-mount power package with integrated ceramic insulator; weight 5.6 g; max torque 1 Nm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Collector (C) | Main high-voltage current path | Connected to flyback transformer primary; must withstand 1500 V transient spikes and conduct 10 A sweep current. |
| Emitter (E) | Current return node | Low-inductance connection to ground plane; handles full load current with minimal VBE(sat) shift. |
| Base (B) | Switching control input | Driven with 1.25 A to ensure saturation; reverse-biased at –2.5 V for fast turn-off in inductive loads. |
Key Features
| Feature | Design Value |
|---|---|
| Diffused collector structure | Stabilizes gain and leakage across temperature and drive variation, reducing design margin dependency. |
| Tight hFE distribution | Min 4.5 / Typ 5 / Max 9 at IC = 6 A - enables consistent base drive sizing across production lots. |
| 2500 V RMS insulation | Eliminates need for separate insulating washers or silicone pads when mounting to metal heatsinks in consumer CRT chassis. |
| 2 °C/W thermal resistance | Permits use of compact heatsinks while maintaining Tj ≤ 150 °C at full 63 W dissipation. |
| Inductive switching characterization | Tested at 64 kHz with LBB = 2 µH and VBB(off) = –2.5 V - directly maps to actual TV horizontal deflection circuit stress. |
Applications
| Large-Screen CRT TVs (>21") | Computer Monitors (15") |
|---|---|
Use Scenario: Horizontal deflection output stage driving flyback transformer in analog broadcast TV receivers. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling sweep current; defines horizontal retrace timing via precise turn-off characteristics. Use Value: 2.6 µs storage time and 600 V VCEO(sus) ensure reliable blanking and prevent secondary arc-over during high-voltage flyback recovery. | Use Scenario: Line-output transistor in VGA/SVGA monitor deflection circuits operating at 31–64 kHz. IC Role / Device Role / Timing Role: Primary switching element in resonant LC horizontal output stage; regulates energy transfer per scan line. Use Value: Tight hFE control and low VCE(sat) reduce thermal drift across brightness settings, maintaining stable geometry and convergence. |
| High-Voltage Industrial Scanners | Legacy Broadcast Transmitter Modulators |
Use Scenario: High-pulse-duty switching in electrostatic imaging drum drivers requiring >1 kV standoff. IC Role / Device Role / Timing Role: Fast-turnoff power switch synchronizing charge/discharge cycles of HV capacitive loads. Use Value: 2500 V RMS insulation and 150 °C max junction temperature support continuous operation in enclosed industrial enclosures without derating. | Use Scenario: Class-B modulator stage in analog RF broadcast transmitters using tube-based final amplifiers. IC Role / Device Role / Timing Role: Grid driver switch supplying controlled negative bias pulses to vacuum tube grids. Use Value: Guaranteed VCEO(sus) of 600 V and 20 A peak current handle transient overloads during AM modulation peaks without latch-up. |
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 | Lower VCBO (1200 V), higher Rthj-case (2.5 °C/W), same ISOWATT218FX package | Rated for ≤19" CRTs; less margin for flyback overshoot in >21" sets | Select only if operating voltage remains below 1200 V and thermal headroom allows higher case rise. |
| 2SC5387 | Higher VCEO(sus) (700 V), but no certified insulation rating; TO-3P package requires external insulator | Requires additional UL-certified mounting hardware; not drop-in for ST2001FX chassis designs | Use only when redesign permits mechanical and safety requalification of heatsink interface. |
Compared with BU2520DX and 2SC5387, ST2001FX uniquely combines 1500 V VCBO, 2500 V insulation, and 2 °C/W thermal resistance in a single UL-compliant package-enabling direct replacement in legacy CRT horizontal output designs without layout or safety revalidation.
Availability
ST2001FX is available at Aetrix Electronics and suitable for CRT television manufacturing, analog monitor repair, and industrial high-voltage pulse generator refurbishment requiring stable component supply and long-lifecycle support.
Supply support for ST2001FX 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, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.
The ST2001FX belongs to ST's legacy high-voltage power transistor family, engineered specifically for reliability-critical horizontal deflection and flyback applications in analog video display systems.
FAQ
Is ST2001FX still in active production?
No-ST2001FX is marked "Obsolete Product(s)" in its official datasheet. However, Aetrix Electronics maintains legacy inventory and offers extended lifecycle sourcing with traceable, tested units meeting original specification limits including VCEO(sus) ≥600 V and ts ≤3 µs.
Can ST2001FX be used in modern switch-mode power supplies?
It is not recommended. ST2001FX lacks optimized gate/base drive compatibility with modern PWM controllers, has no built-in protection features, and its 64 kHz switching characterization targets CRT deflection-not isolated DC-DC conversion topologies requiring tighter EMI control and higher efficiency.
What is the maximum safe mounting torque for the ISOWATT218FX package?
The datasheet specifies a recommended mounting torque of 0.55 Nm and a maximum of 1 Nm. Exceeding 1 Nm risks cracking the internal ceramic insulator or deforming the leadframe, compromising both electrical isolation and thermal performance.
Does ST2001FX require a heatsink in typical CRT applications?
Yes-its 63 W total dissipation rating assumes operation at Tc = 25 °C. In real-world CRT chassis with ambient temperatures up to 70 °C and limited airflow, a heatsink with ≤1.5 °C/W thermal resistance is required to maintain Tj ≤150 °C during sustained horizontal sweep operation.
ST2001FX 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:
- 1.5V @ 1.25A, 5A
- Current - Collector Cutoff (Max):
- 1mA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 5 @ 6A, 5V
- Power - Max:
- 63 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ISOWATT-218FX
ST2001FX FAQ
1.How can I place an order for ST2001FX through Aetrix?
Please submit a Request for Quotation (RFQ) for ST2001FX 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 ST2001FX reliable?
The price and inventory of ST2001FX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST2001FX is usually 5 days.
3.What payment methods are accepted for ST2001FX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST2001FX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST2001FX?
ST2001FX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST2001FX 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 ST2001FX?
For technical support, including ST2001FX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST2001FX requirements.
6.How does Aetrix verify that ST2001FX is sourced from the original manufacturer or authorized distributors?
All ST2001FX 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 ST2001FX meets industry standards.
7.What is the process for return or replacement of ST2001FX?
All ST2001FX units undergo pre-shipment inspection (PSI). If there is an issue with ST2001FX, 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 ST2001FX part is unused and in its original packaging.
Return procedure for ST2001FX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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