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

STMicroelectronics ST2310FX

Name: ST2310FX
Brand: STMicroelectronics
SKU: ST2310FX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ST2310FX

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: ISOWATT218FX

Datasheet:: ST2310FX.pdf

Description:: TRANS NPN 600V 12A ISOWATT-218FX

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ST2310FX from STMicroelectronics is a high-voltage fast-switching NPN power transistor in ISOWATT218FX package, rated for 1500 V V_CES, 12 A I_C, and 65 W P_tot at T_C = 25 °C. It delivers tight h_FE control (6.5–9.5 at I_C = 7 A), 3 V V_CE(sat), and sub-3 µs storage time for horizontal deflection in 17″ monitors and high-end TVs.

For engineers reviewing the ST2310FX datasheet, ST2310FX pinout, ST2310FX application, or ST2310FX equivalent, key selection criteria include insulation withstand voltage (2500 V RMS), inductive switching robustness (L = 25 mH), V_CE(sus) = 600 V, thermal resistance (R_thj-case = 1.9 °C/W), and safe operating area compliance per Figure 3.

Technical Context

This device uses Diffused Collector technology to stabilize operation against base drive variations, minimizing worst-case power dissipation during flyback transitions. Its ruggedized construction supports repetitive inductive switching with t_s = 2.3 µs and t_f = 0.16 µs under 64 kHz horizontal scan conditions.

The fully insulated ISOWATT218FX package enables direct mounting to heatsinks without isolation hardware, while maintaining 2500 V RMS insulation between all three leads and external heatsink-critical for CRT deflection stage safety compliance.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CES	1500 V - Withstands full flyback voltage in CRT horizontal output stages without breakdown.
I_C	12 A continuous - Sustains peak horizontal deflection current in 17″+ monitors.
V_CE(sat)	3 V @ I_C = 7 A, I_B = 1.75 A - Limits conduction loss to ≤21 W during active switch period.
t_s	2.3 µs - Enables reliable 64 kHz switching with minimal dead-time penalty in linearity-critical deflection circuits.
R_thj-case	1.9 °C/W - Allows 65 W dissipation with ≤123.5 °C junction rise above 25 °C case temperature.
V_isol	2500 V RMS - Meets UL insulation requirements for direct heatsink mounting without additional barriers.
h_FE	6.5–9.5 @ I_C = 7 A - Tight gain spread simplifies base drive design across production batches.

Pinout & Package

Package: ISOWATT218FX - Fully insulated plastic power package with integral heatsink interface, UL-compliant, dimensions per mechanical drawing (L4 = 43.2–44.4 mm, G = 10.3–11.5 mm).

Pin/Terminal	Circuit Role	Design Meaning
Collector (C)	Main current sink terminal	Connected to flyback transformer primary; handles 1500 V transient spikes and 12 A peak current.
Base (B)	Current-controlled input	Receives ~1.75 A drive to saturate at 7 A collector current; low V_BE(sat) = 1.1 V reduces driver loss.
Emitter (E)	Current source reference	Returned to ground or damper network; supports 7 V reverse bias (V_EBO) during retrace.

Key Features

Feature	Design Value
Diffused Collector technology	Stabilizes gain and saturation voltage across temperature and drive variation-reducing need for feedback compensation in deflection stages.
Fully insulated package	Eliminates mandatory insulating washers or mica pads when mounted to metal heatsinks-cutting assembly cost and thermal interface resistance.
Tight h_FE control (6.5–9.5)	Enables consistent base drive design across manufacturing lots-reducing test calibration effort and field failure risk from gain drift.
Inductive SOA compliance	Guarantees safe operation up to 600 V V_CE(sus) with 25 mH load-validated per Figure 11 for CRT horizontal deflection reliability.
Low storage time (2.3 µs)	Minimizes switching overlap loss and improves linearity in high-frequency horizontal scanning-critical for geometry and convergence stability.

Applications

Monitor Horizontal Deflection

High-End TV Flyback Stage

Use Scenario: Horizontal scanning in 17″+ CRT monitors operating at 64 kHz.

IC Role / Device Role / Timing Role: High-voltage NPN switch controlling flyback transformer primary current.

Use Value: 1500 V V_CES and 2500 V isolation withstand prevent arcing and ensure UL compliance in compact chassis layouts.

Use Scenario: Line output stage in premium analog TVs requiring stable geometry and low retrace distortion.

IC Role / Device Role / Timing Role: Fast-switching power transistor driving high-inductance horizontal yoke and damper networks.

Use Value: 2.3 µs storage time and tight h_FE spread maintain scan linearity across temperature and aging-reducing service calls.

Industrial CRT Display Systems

Legacy Broadcast Monitor Output

Use Scenario: Ruggedized display subsystems in medical or industrial consoles where long-term reliability is critical.

IC Role / Device Role / Timing Role: Primary switching element in regulated horizontal deflection supply with overvoltage protection.

Use Value: 150 °C max junction temperature and 1.9 °C/W thermal resistance support continuous operation in sealed enclosures without forced cooling.

Use Scenario: Broadcast-grade CRT monitors demanding precise timing and minimal jitter in horizontal sync recovery.

IC Role / Device Role / Timing Role: High-fidelity horizontal output transistor with low V_CE(sat) and repeatable turn-off behavior.

Use Value: 3 V V_CE(sat) and 0.16 µs fall time minimize pulse width distortion-preserving sync edge integrity for downstream timing circuits.

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	V_CES = 1500 V, but higher V_CE(sat) = 3.5 V and looser h_FE range (5–12); R_thj-case = 2.0 °C/W.	Suitable for lower-cost monitor designs where 0.5 V higher saturation drop is acceptable.	Prefer ST2310FX where tighter gain control and lower conduction loss are required for high-reliability systems.
2SC5387	V_CES = 1200 V (300 V lower), same I_C = 12 A, but no certified insulation rating; R_thj-case = 2.2 °C/W.	Used in non-UL-certified legacy equipment where heatsink isolation is handled externally.	Select ST2310FX when UL-compliant insulation and 1500 V capability are mandatory for safety certification.

Compared with BU2520DX and 2SC5387, ST2310FX uniquely combines UL-rated insulation, 1500 V blocking, tight h_FE, and sub-3 µs storage time-making it the only choice for new-design CRT deflection stages requiring both safety compliance and scan-line fidelity.

Availability

ST2310FX is available at Aetrix Electronics and suitable for CRT monitor horizontal deflection, broadcast video equipment flyback stages, and industrial display system power switching requiring stable component supply, long-lifecycle support, and UL-compliant insulation.

Supply support for ST2310FX 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, designing and manufacturing analog, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

The ST2310FX belongs to ST's high-voltage power transistor family, engineered specifically for CRT horizontal deflection and flyback applications where safety, ruggedness, and switching precision are non-negotiable.

FAQ

What is the maximum safe operating voltage for ST2310FX in continuous DC mode?

The absolute maximum V_CEO is 600 V with I_B = 0, and V_CES is 1500 V with V_BE = 0. For continuous DC operation, V_CEO = 600 V is the limiting rating; 1500 V applies only under pulsed, zero-base-current conditions typical of flyback reset. Exceeding 600 V with base open risks secondary breakdown.

Can ST2310FX be used without an insulating pad when mounted to a metal heatsink?

Yes-its ISOWATT218FX package provides 2500 V RMS insulation between all three leads and the external heatsink surface, satisfying UL recognition for direct mounting. No additional insulator is required, provided heatsink surface flatness and torque comply with ST's mechanical data (L4 = 43.2–44.4 mm, G = 10.3–11.5 mm).

What is the recommended base drive current for reliable saturation at 7 A collector current?

Per Table 4, V_CE(sat) = 3 V and V_BE(sat) = 1.1 V are specified at I_C = 7 A and I_B = 1.75 A. A minimum base drive of 1.75 A is required; design margin suggests ≥2.1 A to accommodate h_FE degradation over lifetime and temperature extremes up to 125 °C.

Does ST2310FX support inductive loads with energy recovery diodes?

Yes-the device is characterized for inductive switching with L = 25 mH and specified storage time (t_s = 2.3 µs) and fall time (t_f = 0.16 µs) under those conditions. Its Reverse Biased Safe Operating Area (RBSOA) is validated per Figure 11, confirming compatibility with standard damper diode configurations in CRT horizontal output stages.

ST2310FX Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: ISOWATT218FX

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 12 A

Voltage - Collector Emitter Breakdown (Max):: 600 V

Vce Saturation (Max) @ Ib, Ic:: 3V @ 1.75A, 7A

Current - Collector Cutoff (Max):: 1mA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 6.5 @ 7A, 5V

Power - Max:: 65 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: ISOWATT-218FX

ST2310FX FAQ

1.How can I place an order for ST2310FX through Aetrix?

Please submit a Request for Quotation (RFQ) for ST2310FX 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 ST2310FX reliable?

The price and inventory of ST2310FX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ST2310FX is usually 5 days.

3.What payment methods are accepted for ST2310FX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ST2310FX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ST2310FX?

ST2310FX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ST2310FX 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 ST2310FX?

For technical support, including ST2310FX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ST2310FX requirements.

6.How does Aetrix verify that ST2310FX is sourced from the original manufacturer or authorized distributors?

All ST2310FX 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 ST2310FX meets industry standards.

7.What is the process for return or replacement of ST2310FX?

All ST2310FX units undergo pre-shipment inspection (PSI). If there is an issue with ST2310FX, 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 ST2310FX part is unused and in its original packaging.

Return procedure for ST2310FX:

1.Submit a request within 90 days.

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

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