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

STMicroelectronics MD2009DFP

Name: MD2009DFP
Brand: STMicroelectronics
SKU: MD2009DFP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MD2009DFP

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: MD2009DFP.pdf

Description:: TRANS NPN 700V 10A TO-220 FP

Quantity:: RFQ Add To RFQ list

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Inventory:3,539

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Product details

Overview

MD2009DFP from STMicroelectronics is a high-voltage NPN power transistor with integrated freewheeling diode, designed for horizontal deflection output stages in CRT television systems. It features 1500 V V_CES, 10 A continuous collector current, 40 W total dissipation at T_c = 25°C, and TO-220FP fully isolated package compliant with UL standards.

For engineers reviewing the MD2009DFP datasheet, MD2009DFP pinout, MD2009DFP application in CRT deflection circuits, or MD2009DFP equivalent for high-voltage switching, key selection criteria include V_CES rating, h_FE stability at 5.5 A, integrated diode VF, and isolation voltage compliance for safety-critical flyback operation.

Technical Context

This device employs diffused-collector planar technology with an enhanced high-voltage structure optimized for inductive flyback switching in CRT horizontal deflection. Its internal freewheeling diode enables self-contained energy recirculation during turn-off, reducing external component count and improving reliability under repetitive 16 kHz switching conditions.

The transistor delivers tight h_FE range (4.7–18 at I_C = 5.5 A), low base drive requirement (I_B = 1.4 A for I_C = 5.5 A), and stable performance across -65°C to 150°C operating junction temperature, supporting robust thermal management in sealed TV chassis environments.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CES	1500 V - Withstands peak flyback voltage in CRT horizontal deflection without breakdown
I_C (continuous)	10 A - Supports full-swing horizontal output current in standard CRT TV applications
V_F (diode)	1.6 V @ 5.5 A - Limits conduction loss during freewheeling phase, reducing heat generation
h_FE	4.7–18 @ I_C = 5.5 A - Enables predictable base drive design with minimal gain variation
R_thj-case	3.12 °C/W max - Allows effective heatsinking in compact TV power supply compartments
V_ISO	2500 V RMS - Ensures reinforced insulation between leads and heatsink per UL safety requirements

Pinout & Package

Package: TO-220FP - Fully isolated power package with insulated mounting flange, UL recognized, suitable for direct heatsink mounting without insulating washers.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal of NPN transistor	Reference node for base drive and diode cathode connection; tied to ground-referenced deflection yoke return path
2 (Collector)	Collector terminal of NPN transistor	Connected to primary winding of horizontal output transformer; handles 1500 V flyback spikes
3 (Base)	Base control terminal	Receives TTL-compatible drive signal; R_BE = 60 Ω typ. provides internal base-emitter resistor for simplified biasing

Key Features

Feature	Design Value
Integrated freewheeling diode	Eliminates need for external flyback diode, reducing PCB area and assembly cost in CRT deflection stage
Diffused collector "enhanced generation"	Improves silicon efficiency and SOA margin under repetitive inductive switching stress at 16 kHz
Tight h_FE range at operating current	Enables consistent base drive design across production lots without individual calibration
UL-compliant fully isolated package	Permits safe direct mounting to grounded heatsinks without additional insulation, meeting CRT safety standards

Applications

Horizontal Deflection Output

High-Voltage Flyback Generator

Use Scenario: Horizontal scanning circuit in analog CRT televisions requiring precise 15.625 kHz timing and high-voltage flyback pulse generation.

IC Role / Device Role / Timing Role: NPN power switch controlling primary current in horizontal output transformer; integrated diode recirculates stored inductive energy.

Use Value: 1500 V V_CES withstands peak flyback voltage; 2500 V isolation ensures user safety in mains-connected chassis designs.

Use Scenario: High-voltage DC generation for CRT anode supply via flyback transformer secondary rectification.

IC Role / Device Role / Timing Role: Primary-side switching element in resonant flyback topology; operates at fixed 16 kHz with controlled storage/fall times (t_s = 4.5–6 µs, t_f = 0.3–0.6 µs).

Use Value: Low V_CE(sat) (2.8 V) and V_BE(sat) (1.3 V) minimize conduction losses during high-duty-cycle operation.

Legacy TV Repair Replacement

Industrial HV Pulse Generator

Use Scenario: Drop-in replacement for obsolete horizontal output transistors in service centers repairing CRT-based broadcast monitors and medical imaging displays.

IC Role / Device Role / Timing Role: Direct functional replacement with identical TO-220FP footprint, pinout, and electrical envelope (V_CEO = 700 V, I_C = 10 A).

Use Value: Tight h_FE distribution and stable thermal resistance (3.12 °C/W) ensure consistent performance across aging equipment fleets.

Use Scenario: Repetitive high-voltage pulse generation in industrial plasma ignition, capacitor discharge units, and scientific instrumentation.

IC Role / Device Role / Timing Role: Switching element driving inductive loads with L_BB = 6.2 µH under controlled IB(on)/VBE(off) conditions.

Use Value: Rated for 16 A peak collector current (t_P < 5 ms) and 150°C junction temperature, enabling short-duration high-power bursts.

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, I_C = 10 A, but no integrated diode; requires external freewheeling diode	Lacks integrated diode, increasing BOM count and layout complexity in space-constrained CRT designs	Select when diode replacement is already available and thermal coupling to external diode is well-controlled
2SD2578	V_CES = 1500 V, I_C = 8 A, TO-3P package, no integrated diode, R_thj-case = 2.5 °C/W	Higher thermal efficiency but larger footprint and no built-in diode; not UL-isolated	Prefer for non-UL-certified industrial pulse generators where heatsink isolation is managed externally

Compared with BU2520DX and 2SD2578, MD2009DFP uniquely combines UL-isolated TO-220FP packaging, integrated diode, and guaranteed h_FE range-reducing design risk and qualification effort specifically for certified CRT deflection systems.

Availability

MD2009DFP is available at Aetrix Electronics and suitable for CRT television manufacturing, legacy display repair services, and industrial high-voltage pulse generator development requiring stable component supply and long-term lifecycle support.

Supply support for MD2009DFP 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, specializing in power discrete devices, microcontrollers, and automotive ICs.

The MD series targets high-voltage analog power switching, with MD2009DFP engineered specifically for reliability-critical horizontal deflection stages in consumer CRT video equipment.

FAQ

What is the purpose of the integrated freewheeling diode in MD2009DFP?

The integrated freewheeling diode provides a low-loss path for inductive energy recovery during transistor turn-off in horizontal deflection circuits. It eliminates the need for an external diode, reduces PCB footprint, improves thermal coupling between switch and diode, and ensures consistent timing behavior under 16 kHz flyback operation with 1.6 V forward drop at 5.5 A.

Can MD2009DFP be used in non-CRT applications such as SMPS or motor drives?

While electrically capable of switching inductive loads up to 1500 V and 16 A peak, MD2009DFP is optimized for 16 kHz horizontal deflection duty cycles and lacks datasheet characterization for PWM frequencies above 50 kHz or continuous conduction mode. Its safe operating area and thermal derating curves are validated only for CRT flyback waveforms-not general-purpose SMPS or motor control topologies.

Is the TO-220FP package truly isolated, and what does that mean for heatsink mounting?

Yes-the TO-220FP package features a fully insulated metal flange rated for 2500 V RMS isolation between all three leads and the heatsink mounting surface. This allows direct mechanical attachment to a grounded heatsink without mica washers or silicone pads, simplifying thermal design while meeting UL Class X insulation requirements for mains-connected CRT chassis.

How does the R_BE = 60 Ω internal resistor affect base drive design?

The internal 60 Ω base-emitter resistor provides automatic turn-off biasing, eliminating the need for an external pull-down resistor. It ensures reliable cutoff during signal transitions and stabilizes operating point against leakage currents, particularly beneficial in high-temperature CRT environments where external resistor drift could cause unintended conduction.

MD2009DFP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Obsolete

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 10 A

Voltage - Collector Emitter Breakdown (Max):: 700 V

Vce Saturation (Max) @ Ib, Ic:: 2.8V @ 1.4A, 5.5A

Current - Collector Cutoff (Max):: 200µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 5 @ 5.5A, 5V

Power - Max:: 40 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220 Full Pack

MD2009DFP FAQ

1.How can I place an order for MD2009DFP through Aetrix?

Please submit a Request for Quotation (RFQ) for MD2009DFP 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 MD2009DFP reliable?

The price and inventory of MD2009DFP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MD2009DFP is usually 5 days.

3.What payment methods are accepted for MD2009DFP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MD2009DFP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MD2009DFP?

MD2009DFP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MD2009DFP 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 MD2009DFP?

For technical support, including MD2009DFP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MD2009DFP requirements.

6.How does Aetrix verify that MD2009DFP is sourced from the original manufacturer or authorized distributors?

All MD2009DFP 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 MD2009DFP meets industry standards.

7.What is the process for return or replacement of MD2009DFP?

All MD2009DFP units undergo pre-shipment inspection (PSI). If there is an issue with MD2009DFP, 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 MD2009DFP part is unused and in its original packaging.

Return procedure for MD2009DFP:

1.Submit a request within 90 days.

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

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