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

STMicroelectronics D44H11

Name: D44H11
Brand: STMicroelectronics
SKU: D44H11
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: D44H11

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3

Datasheet:: D44H11.pdf

Description:: TRANS NPN 80V 10A TO-220

Quantity:: RFQ Add To RFQ list

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Inventory:1,900

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Product details

Overview

D44H11 from STMicroelectronics is an NPN silicon power bipolar junction transistor (BJT) designed for linear amplification and hard-switching applications, with 80 V V_CEO, 10 A I_C, 50 W P_TOT, and low 1 V V_CE(sat) at 8 A/0.4 A drive-used in audio output stages and DC-DC converter switches.

For engineers reviewing the D44H11 datasheet, D44H11 pinout, D44H11 application, or D44H11 equivalent, key selection criteria include safe operating area (SOA) compliance at 25 °C case temperature, thermal resistance (R_thJC = 2.5 °C/W), h_FE ≥ 40 at 4 A, and TO-220 mechanical compatibility in high-current discrete designs.

Technical Context

The D44H11 operates as a medium-power NPN switching and linear amplifier transistor with planar epitaxial construction, supporting continuous collector current up to 10 A and pulsed peaks to 20 A. Its V_CEO = 80 V and V_CE(sat) ≤ 1 V at I_C = 8 A / I_B = 0.4 A enable efficient operation in Class AB audio outputs and relay drivers.

Thermal design relies on direct case-to-heatsink conduction via the metal tab (TO-220 package), with R_thJC = 2.5 °C/W enabling 50 W dissipation at T_case = 25 °C; derating begins above 25 °C per Figure 3, and maximum junction temperature is limited to 150 °C.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	80 V - maximum blocking voltage between collector and emitter with base open; defines upper rail limit in switching topologies
I_C	10 A continuous - steady-state current handling capacity; sets minimum trace width and heatsink sizing
P_TOT	50 W at T_case = 25 °C - total power dissipation limit before thermal shutdown; requires active heatsinking above ~15 W
V_CE(sat)	≤ 1 V at I_C = 8 A, I_B = 0.4 A - low saturation voltage reduces conduction loss in switch-mode operation
h_FE	≥ 40 at I_C = 4 A, V_CE = 1 V - sufficient DC gain for simple base-driven switching without Darlington configuration
R_thJC	2.5 °C/W - junction-to-case thermal resistance; determines temperature rise across mounting interface under load

Pinout & Package

Supplied in TO-220 package with isolated metal tab (pin 3), standardized for vertical heatsink mounting. Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector (tab).

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for NPN device	Connected to ground or low-side return; must handle full load current and support low-inductance layout
2 (Base)	Control terminal for minority-carrier injection	Driven with ≥0.4 A peak to ensure saturation; requires current-limiting resistor or driver stage
3 (Collector / Tab)	Main current input and thermal interface	Electrically connected to collector; mounted directly to heatsink with insulating washer if chassis-grounded

Key Features

Feature	Design Value
Low V_CE(sat)	≤1 V at 8 A enables <1 W conduction loss in 12 V/5 A switching loads
Fast switching speed	Supported by low stored charge and optimized epitaxial structure-reduces turn-off delay in PWM circuits
High SOA rating	Validated safe operating area up to 10 A × 80 V at DC, critical for inductive load snubbing
TO-220 mechanical standardization	Compatible with industry-standard heatsinks and PCB footprints; tab isolation supports grounded or floating mounting

Applications

Audio Power Amplifier

DC-DC Converter Switch

Use Scenario: Final output stage in 20–50 W Class AB audio amplifiers driving 4–8 Ω speakers.

IC Role / Device Role / Timing Role: NPN power switch amplifying line-level signals into speaker current with minimal crossover distortion.

Use Value: Low V_CE(sat) and stable h_FE across 1–5 A range maintain linearity and reduce heat sink size.

Use Scenario: High-side or low-side switch in 24 V input, 5–15 A buck converters for industrial power supplies.

IC Role / Device Role / Timing Role: Hard-switched BJT controlling energy transfer through inductor during ON/OFF cycles.

Use Value: 80 V V_CEO provides margin over 24 V bus transients; 20 A I_CM accommodates startup surge currents.

Motor Driver Stage

Relay / Solenoid Driver

Use Scenario: H-bridge half-bridge leg driving brushed DC motors up to 30 V, 8 A continuous.

IC Role / Device Role / Timing Role: Current-handling switch turning motor winding on/off under microcontroller PWM control.

Use Value: Robust SOA prevents second breakdown during inductive kickback; R_thJC = 2.5 °C/W allows passive cooling at ≤7 A.

Use Scenario: Direct drive of 12–24 V, 500–2000 mA electromagnetic relays or solenoids in PLC I/O modules.

IC Role / Device Role / Timing Role: Saturated switch providing full coil current with minimal voltage drop and self-protection against back-EMF.

Use Value: V_BE(sat) ≤ 1.5 V ensures reliable turn-on with 5 V logic; built-in ruggedness tolerates repetitive inductive spikes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN power transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJE13009	V_CEO = 400 V, I_C = 12 A, higher V_CE(sat) ≈ 1.5 V at 8 A	Better for flyback SMPS primary switching; less suitable for low-voltage linear amps due to higher saturation loss	Select when >100 V blocking is required; avoid where <1 V V_CE(sat) is critical for efficiency
TIP31C	V_CEO = 100 V, I_C = 3 A, lower power rating (P_TOT = 40 W)	Limited to ≤3 A loads; insufficient SOA for sustained 8 A operation	Acceptable for low-current relay drivers; not recommended for audio output or motor control above 3 A

Compared with MJE13009 and TIP31C, the D44H11 uniquely balances 80 V blocking, 10 A current, and sub-1 V saturation in a TO-220 package-making it optimal for mid-power linear and switching roles where both voltage margin and conduction efficiency matter.

Availability

D44H11 is available at Aetrix Electronics and suitable for audio power amplifiers, DC-DC converter switches, and motor driver stages requiring stable component supply and long-term industrial availability.

Supply support for D44H11 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, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The D44H11 belongs to ST's legacy power bipolar transistor family, engineered for robustness and manufacturability in general-purpose linear and switching power applications-not optimized for RF or ultra-high-speed use.

FAQ

Is the D44H11 RoHS-compliant and halogen-free?

Yes. Per STMicroelectronics' ECOPACK® documentation, the D44H11 is offered in RoHS-compliant and halogen-free versions. The "ECOPACK2" grade applies, meeting EU Directive 2011/65/EU and JEDEC JS709B standards. Packaging markings and datasheet revision history confirm environmental compliance status as of Rev 5 (2009).

Can the D44H11 be used in parallel configurations?

Yes, but only with emitter resistors (0.1–0.22 Ω) and matched h_FE devices. The D44H11 exhibits positive thermal feedback; without individual emitter degeneration, current hogging occurs above 5 A per device. ST recommends using matched lots and thermally coupled mounting for stable parallel operation.

What is the maximum safe base drive current for continuous operation?

The absolute maximum I_B is not explicitly rated, but electrical characteristics specify V_BE(sat) at I_B = 0.8 A. For continuous 8 A collector current, 0.4 A base drive is sufficient and thermally sustainable. Exceeding 0.8 A risks localized heating at the bond wire; pulsed drive may reach 1.2 A briefly, provided duty cycle remains <5%.

Does the metal tab connect internally to any pin?

Yes-the metal tab (Pin 3) is electrically connected to the collector. In TO-220 type A mechanical data, the tab is defined as the collector terminal. When mounting to a heatsink, electrical isolation (e.g., mica washer + nylon screw) is required unless the heatsink is floating or collector-referenced in the circuit.

D44H11 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Active

Transistor Type:: NPN

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

Voltage - Collector Emitter Breakdown (Max):: 80 V

Vce Saturation (Max) @ Ib, Ic:: 1V @ 400mA, 8A

Current - Collector Cutoff (Max):: 10µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 40 @ 4A, 1V

Power - Max:: 50 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

D44H11 FAQ

1.How can I place an order for D44H11 through Aetrix?

Please submit a Request for Quotation (RFQ) for D44H11 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 D44H11 reliable?

The price and inventory of D44H11 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for D44H11 is usually 5 days.

3.What payment methods are accepted for D44H11?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for D44H11 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for D44H11?

D44H11 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your D44H11 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 D44H11?

For technical support, including D44H11 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your D44H11 requirements.

6.How does Aetrix verify that D44H11 is sourced from the original manufacturer or authorized distributors?

All D44H11 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 D44H11 meets industry standards.

7.What is the process for return or replacement of D44H11?

All D44H11 units undergo pre-shipment inspection (PSI). If there is an issue with D44H11, 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 D44H11 part is unused and in its original packaging.

Return procedure for D44H11:

1.Submit a request within 90 days.

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

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