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STMicroelectronics ST1802HI
- Part No.:
- ST1802HI
- Manufacturer:
- STMicroelectronics
- Category:
- Single Bipolar Transistors
- Package:
- ISOWATT-218-3
- Datasheet:
-
ST1802HI.pdf
- Description:
- TRANS NPN 600V 10A ISOWATT-218
- Quantity:
- Payment:
- Shipping:
Inventory:5,488
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Product details
Overview
ST1802HI from STMicroelectronics is a high-voltage fast-switching NPN power transistor designed for horizontal deflection in CRT color TVs up to 25 inches. It features 1500 V VCBO, 600 V VCEO, 10 A IC continuous, 50 W total dissipation at Tc = 25 °C, and fully insulated ISOWATT218 package compliant with UL insulation standards.
For engineers reviewing the ST1802HI datasheet, ST1802HI pinout, ST1802HI application, or ST1802HI equivalent, key selection criteria include high-voltage sustaining capability (VCEO(sus) = 600 V), tight hFE control (4–25 at IC = 1–5 A), sub-4 µs storage time, 2500 V RMS insulation withstand voltage, and rugged inductive switching performance at 16 kHz.
Technical Context
This transistor employs diffused collector technology to stabilize operation against base drive variations, minimizing worst-case power dissipation during flyback switching. Its design targets high-reliability horizontal output stages where precise VCEO(sus), low VCE(sat) (≤1.5 V @ IC = 4 A, IB = 1.2 A), and controlled switching times (ts ≤ 4 µs, tf ≤ 0.6 µs) are critical.
The ISOWATT218 package integrates full electrical isolation between all three leads and the heatsink, enabling direct mounting without insulating washers while maintaining 2500 V RMS dielectric strength. Thermal resistance Rthj-case is rated at 2.5 °C/W, supporting sustained 50 W dissipation at case temperature 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCBO | 1500 V - Enables safe operation in high-voltage flyback circuits with margin above line-derived peak voltages. |
| VCEO(sus) | 600 V - Sustaining voltage under inductive turn-off (IC = 100 mA, L = 25 mH), defining safe SOA boundary. |
| IC / ICM | 10 A continuous / 15 A peak - Supports horizontal deflection current demands with short-duration surge tolerance. |
| ts / tf | ≤4 µs / ≤0.6 µs - Fast storage and fall times reduce switching losses at 16 kHz horizontal scan frequency. |
| Rthj-case | 2.5 °C/W - Allows effective thermal management on standard heatsinks without forced air cooling. |
| Visol | 2500 V RMS - Full isolation between leads and heatsink meets UL safety requirements for consumer CRT TV mounting. |
| hFE | 4–25 - Tight DC current gain spread ensures consistent base drive design across production lots. |
Pinout & Package
Package: ISOWATT218 (narrow leads), UL-compliant fully insulated plastic power package weighing 4.9 g. Mounting torque: 0.8 Nm recommended (max 1 Nm). Side flatness tolerance: ≤80 µm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Collector) | Main high-current output node | Connected to flyback transformer primary; handles 10 A continuous and 1500 V transient stress. |
| 2 (Base) | Control input for switching | Receives pulsed drive (IBon ≈ 850 mA); tight hFE enables predictable drive current sizing. |
| 3 (Emitter) | Current return path and reference | Ground-referenced emitter configuration; supports low-side switching with isolated heatsink mounting. |
Key Features
| Feature | Design Value |
|---|---|
| Diffused collector structure | Stabilizes operating point against base drive variation, reducing worst-case dissipation in CRT deflection circuits. |
| Tight hFE control (4–25) | Enables robust, low-margin base drive design without overdesigning driver stage or risking saturation loss. |
| 2500 V RMS insulation | Eliminates need for insulating pads/washers when mounting to metal chassis, simplifying assembly and improving thermal contact. |
| 2.5 °C/W thermal resistance | Supports 50 W continuous dissipation with passive heatsinking-critical for compact TV chassis layouts. |
| Inductive SOA compliance | Guaranteed safe operation under 25 mH load at 16 kHz, matching CRT horizontal deflection energy recovery requirements. |
Applications
| Horizontal Deflection in CRT TVs | High-Voltage Flyback Power Switch |
|---|---|
Use Scenario: Horizontal output stage in 14–25 inch color CRT televisions driving flyback transformer primary. IC Role / Device Role / Timing Role: NPN power switch turning on/off 16 kHz horizontal scan current; sustains 600 V during retrace. Use Value: Low ts/tf minimizes switching loss; tight hFE ensures stable base drive across temperature and unit variance. | Use Scenario: High-voltage DC-DC converter primary switch in industrial flyback supplies requiring >600 V blocking. IC Role / Device Role / Timing Role: Main power switch handling repetitive inductive turn-off transients with 25 mH load. Use Value: VCEO(sus) = 600 V and SOA-rated operation enable reliable energy transfer without snubber overdesign. |
| UL-Compliant Heatsink-Mounted Switch | Ruggedized Consumer Display Power Stage |
Use Scenario: Isolated mounting directly to grounded metal chassis in safety-certified consumer electronics. IC Role / Device Role / Timing Role: High-voltage switch with integrated 2500 V RMS lead-to-heatsink isolation. Use Value: Eliminates external insulation hardware, reduces BOM count, and improves thermal coupling vs. insulated mounts. | Use Scenario: Replacement for legacy horizontal output transistors in service/repair of analog display systems. IC Role / Device Role / Timing Role: Drop-in compatible NPN power transistor with enhanced ruggedness and tighter gain control. Use Value: Improved failure rate in field units due to tighter hFE, lower VCE(sat), and higher Visol rating. |
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 | VCEO = 1500 V (higher), hFE = 10–30 (wider spread), Rthj-case = 2.0 °C/W (lower) | Designed for larger CRTs (up to 32"), higher power handling | Prefer when higher voltage margin or lower thermal resistance is required; verify base drive compatibility due to wider hFE range. |
| 2SC5148 | VCEO = 700 V (lower), ts = 5 µs (slower), Visol not specified | Lacks certified insulation; requires external isolation hardware | Select only if isolation is handled externally and 600 V VCEO(sus) margin is sufficient; avoid in UL-certified new designs. |
Compared with BU2520DX and 2SC5148, ST1802HI offers balanced 600 V sustaining voltage, industry-standard ISOWATT218 insulation, and tighter hFE control-making it optimal for cost-sensitive, safety-compliant 25-inch CRT deflection where thermal and timing margins are constrained.
Availability
ST1802HI is available at Aetrix Electronics and suitable for CRT television repair, legacy display system maintenance, and industrial flyback power supply refurbishment requiring stable component supply and long-lifecycle support.
Supply support for ST1802HI 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 ST1802HI belongs to ST's legacy high-voltage power transistor family, engineered specifically for reliability-critical horizontal deflection and flyback switching in analog video systems.
FAQ
Is ST1802HI still in active production?
No-ST1802HI is marked "Obsolete Product(s)" in the official datasheet (December 2002 revision). Aetrix Electronics maintains limited legacy stock for repair and maintenance programs, with full traceability and extended lifecycle support documentation.
Can ST1802HI be used in surface-mount designs?
No-it is exclusively packaged in through-hole ISOWATT218 with mounting flange and screw hole. The mechanical drawing specifies narrow leads and 0.8 Nm torque requirement, confirming its intended use in chassis-mounted, heatsink-coupled applications.
What is the maximum safe operating frequency for ST1802HI?
The device is characterized and validated for 16 kHz inductive switching (per Figure 1 test circuit). While faster operation may be possible, thermal and SOA limits become dominant above 20 kHz; design validation at higher frequencies requires derating per the published SOA curves.
Does ST1802HI require a base resistor in typical CRT deflection circuits?
Yes-its hFE range (4–25) and required IBon (~850 mA) necessitate a precisely calculated base drive resistor or active current source. Undriven or open-base operation risks secondary breakdown; datasheet recommends pulsed base drive with negative VBB(off) = −2.5 V for clean turn-off.
ST1802HI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- ISOWATT-218-3
- 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:
- 50 W
- Frequency - Transition:
- -
- Operating Temperature:
- 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- ISOWATT-218
ST1802HI FAQ
1.How can I place an order for ST1802HI through Aetrix?
Please submit a Request for Quotation (RFQ) for ST1802HI 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 ST1802HI reliable?
The price and inventory of ST1802HI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST1802HI is usually 5 days.
3.What payment methods are accepted for ST1802HI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST1802HI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ST1802HI?
ST1802HI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ST1802HI 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 ST1802HI?
For technical support, including ST1802HI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST1802HI requirements.
6.How does Aetrix verify that ST1802HI is sourced from the original manufacturer or authorized distributors?
All ST1802HI 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 ST1802HI meets industry standards.
7.What is the process for return or replacement of ST1802HI?
All ST1802HI units undergo pre-shipment inspection (PSI). If there is an issue with ST1802HI, 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 ST1802HI part is unused and in its original packaging.
Return procedure for ST1802HI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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