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

STMicroelectronics MD2103DFP

Name: MD2103DFP
Brand: STMicroelectronics
SKU: MD2103DFP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MD2103DFP

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: MD2103DFP.pdf

Description:: TRANS NPN 700V 6A TO-220FP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MD2103DFP from STMicroelectronics is a high-voltage NPN power transistor with integrated freewheeling diode, designed for horizontal deflection output stages in standard-definition CRT television displays. It features V_CES = 1500 V, I_C = 6 A, P_tot = 38 W at T_c ≤ 25°C, R_thj-case = 3.3 °C/W, and UL-compliant fully insulated TO-220FP package.

For engineers reviewing the MD2103DFP datasheet, MD2103DFP pinout, MD2103DFP application, or MD2103DFP equivalent, key selection criteria include high-voltage switching capability (V_CES = 1500 V), low base drive requirement (I_B = 0.75 A for V_CE(sat) = 1.8 V at I_C = 3 A), integrated diode (V_F = 2 V at I_F = 3 A), thermal resistance, and insulation withstand voltage (V_INS = 1500 V RMS).

Technical Context

The MD2103DFP employs diffused collector "enhanced generation" planar technology to achieve stable h_FE across temperature and tight DC current gain distribution (h_FE = 6.5–9.5 at I_C = 3 A, V_CE = 5 V). Its internal structure integrates a fast-recovery freewheeling diode with V_F = 2 V at 3 A, enabling efficient inductive load commutation in horizontal deflection circuits.

It operates under strict safe operating area (SOA) constraints defined by V_CEO = 700 V, I_CM = 9 A (t_P < 5 ms), and junction temperature limit of 150 °C. The TO-220FP package provides full electrical insulation between leads and heatsink, validated at 1500 V RMS.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CES	1500 V - Enables direct connection to CRT flyback transformer primary without external snubbing
I_C	6 A continuous - Supports peak horizontal deflection currents in SD-CRT applications
V_CE(sat)	1.8 V @ I_C = 3 A, I_B = 0.75 A - Minimizes conduction loss during active switching phase
R_thj-case	3.3 °C/W max - Allows 38 W dissipation with modest heatsinking at T_c = 25°C
V_INS	1500 V RMS - Ensures isolation integrity between all three terminals and external heatsink per UL requirements
h_FE	6.5–9.5 @ I_C = 3 A - Tight gain range simplifies base drive design and improves linearity
V_F (diode)	2 V @ I_F = 3 A - Integrated freewheeling path reduces component count and layout complexity

Pinout & Package

MD2103DFP uses the UL-recognized, fully insulated TO-220FP package (lead-to-heatsink insulation rated 1500 V RMS). The package features three leads in linear configuration: Pin 1 = Collector, Pin 2 = Base, Pin 3 = Emitter - verified from internal schematic (Figure 1) and mechanical drawing (page 7).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Collector	Main high-voltage switching node connected to flyback transformer primary
Pin 2	Base	Control input with R_BE = 65 Ω (typ) integrated base-emitter resistor for simplified drive
Pin 3	Emitter	Power return path; also anode of integrated freewheeling diode

Key Features

Feature	Design Value
Diffused collector "enhanced generation" structure	Improves silicon efficiency and extends SOA margin in high-voltage switching
Tight h_FE range at operating current	Reduces variation in base drive requirements across production lots
Integrated freewheeling diode	Eliminates need for external diode in horizontal deflection flyback recovery path
UL-compliant fully insulated package	Enables direct mounting to grounded heatsink without insulating hardware
Low base drive requirement	Supports direct drive from standard horizontal output driver ICs without amplification

Applications

SD-CRT Horizontal Deflection Stage

Legacy TV Flyback Power Switch

Use Scenario: Horizontal scanning circuit in analog CRT televisions requiring repetitive 15.625 kHz switching into inductive flyback load.

IC Role / Device Role / Timing Role: Main high-voltage switching transistor controlling energy transfer to flyback transformer primary.

Use Value: V_CES = 1500 V withstands flyback voltage spikes; integrated diode enables clean energy recirculation without external components.

Use Scenario: Power switch in legacy TV flyback converters where compactness and reliability are critical.

IC Role / Device Role / Timing Role: Primary-side switching element synchronized to horizontal sync signal for regulated HV generation.

Use Value: R_thj-case = 3.3 °C/W allows stable operation at 38 W dissipation; UL insulation eliminates creepage/clearance concerns on PCB.

Monochrome Monitor Output Stage

Industrial CRT Display Driver

Use Scenario: High-reliability monochrome display systems used in medical or industrial instrumentation.

IC Role / Device Role / Timing Role: Horizontal output device driving fixed-frequency deflection yoke with minimal waveform distortion.

Use Value: Stable h_FE vs. temperature ensures consistent brightness and linearity over ambient range (-65 to 150°C).

Use Scenario: Embedded CRT-based HMI displays in factory automation equipment.

IC Role / Device Role / Timing Role: Robust power switch handling repeated surge currents in harsh EMI environments.

Use Value: I_CM = 9 A (5 ms) supports transient overload conditions; ECOPACK® lead-free construction meets RoHS compliance requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage NPN horizontal deflection transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BU2520DX	V_CES = 1500 V, I_C = 10 A, no integrated diode, R_thj-case = 2.5 °C/W	Requires external freewheeling diode; higher current rating suits larger CRTs	Select when higher peak current headroom is needed and board space permits discrete diode placement
2SC5411	V_CES = 1500 V, I_C = 5 A, no integrated diode, TO-3P package, non-insulated	Needs insulating washer and external diode; lower power dissipation (30 W)	Choose only if existing mechanical design accommodates TO-3P and insulation is implemented externally

Compared with BU2520DX and 2SC5411, the MD2103DFP uniquely combines integrated diode functionality, UL-rated insulation, and optimized gain uniformity-reducing BOM count and improving safety compliance in space-constrained CRT designs.

Availability

MD2103DFP is available at Aetrix Electronics and suitable for legacy CRT repair, SD-TV refurbishment, and industrial monitor maintenance requiring stable component supply and long-term traceability.

Supply support for MD2103DFP 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.

The MD series targets high-voltage horizontal deflection applications in CRT-based video systems, emphasizing ruggedness, thermal stability, and integration of protection elements like built-in diodes and insulated packaging.

FAQ

Is MD2103DFP still in active production?

No - STMicroelectronics has marked MD2103DFP as Obsolete (per Revision History, May 2008). However, Aetrix Electronics maintains legacy inventory with full traceability and offers extended lifecycle support including controlled distribution and documentation archiving for repair and maintenance programs.

Can MD2103DFP be mounted directly to a grounded heatsink?

Yes - the TO-220FP package is UL-recognized for full electrical insulation (1500 V RMS) between all three leads and the heatsink surface. No mica washer or insulating pad is required, simplifying thermal assembly and improving reliability in CRT chassis designs.

What is the purpose of the integrated base-emitter resistor (R_BE = 65 Ω)?

The integrated 65 Ω resistor connects internally between base and emitter, providing automatic turn-off biasing and reducing sensitivity to leakage currents. This enhances switching stability in high-noise CRT environments and eliminates the need for an external base pull-down resistor in most horizontal deflection driver configurations.

Does MD2103DFP meet RoHS requirements?

Yes - per Package Mechanical Data section (page 6), MD2103DFP is supplied in ST's ECOPACK® package with lead-free second-level interconnect, compliant with JEDEC Standard JESD97 and EU RoHS Directive 2011/65/EU, as confirmed by inner box labeling and ST's public ECOPACK specifications.

MD2103DFP 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):: 6 A

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

Vce Saturation (Max) @ Ib, Ic:: 1.8V @ 750mA, 3A

Current - Collector Cutoff (Max):: 200µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 6.5 @ 3A, 5V

Power - Max:: 38 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

MD2103DFP FAQ

1.How can I place an order for MD2103DFP through Aetrix?

Please submit a Request for Quotation (RFQ) for MD2103DFP 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 MD2103DFP reliable?

The price and inventory of MD2103DFP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MD2103DFP is usually 5 days.

3.What payment methods are accepted for MD2103DFP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MD2103DFP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MD2103DFP?

MD2103DFP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MD2103DFP 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 MD2103DFP?

For technical support, including MD2103DFP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MD2103DFP requirements.

6.How does Aetrix verify that MD2103DFP is sourced from the original manufacturer or authorized distributors?

All MD2103DFP 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 MD2103DFP meets industry standards.

7.What is the process for return or replacement of MD2103DFP?

All MD2103DFP units undergo pre-shipment inspection (PSI). If there is an issue with MD2103DFP, 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 MD2103DFP part is unused and in its original packaging.

Return procedure for MD2103DFP:

1.Submit a request within 90 days.

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

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