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onsemi D44C8
- Part No.:
- D44C8
- Manufacturer:
- onsemi
- Category:
- Single Bipolar Transistors
- Package:
- TO-220-3
- Datasheet:
-
D44C8.pdf
- Description:
- TRANS NPN 60V 4A TO-220-3
- Quantity:
- Payment:
- Shipping:
Inventory:5,856
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Product details
Overview
D44C8 from ON Semiconductor is an NPN power amplifier transistor designed for medium-power linear and switching applications, featuring a 60 V VCEO, 4.0 A continuous collector current, and 60 W total device dissipation at 25°C in a TO-220 package. It delivers DC current gain (hFE) of 40–120 at IC = 0.2 A and supports audio output stages and motor drive circuits requiring robust thermal performance.
For engineers reviewing the D44C8 datasheet, pinout, applications, or equivalent options, key selection considerations include its 2.1 °C/W junction-to-case thermal resistance, 40 MHz fT, saturation voltage of 0.5 V at IC = 1.0 A / IB = 50 mA, and confirmed TO-220 pinout (Base–Collector–Emitter).
Technical Context
The D44C8 is a silicon NPN bipolar junction transistor fabricated using Fairchild's Process 4P, optimized for high-current amplification with low saturation voltage and controlled switching behavior. Its 60 V VCEO rating and 150°C maximum junction temperature support operation in industrial power supplies and audio amplifiers where reliability under sustained load is critical.
Thermal design is enabled by its low RθJC of 2.1 °C/W and TO-220 mechanical mounting interface, while its 100 pF Cob and 40 MHz fT define usable bandwidth in mid-frequency linear amplification and pulse-switching roles up to several megahertz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 60 V - Maximum safe collector-emitter voltage before breakdown under open-base conditions |
| IC (continuous) | 4.0 A - Sustained collector current capability without thermal runaway at TA = 25°C |
| PD | 60 W - Total power dissipation limit at 25°C ambient, derating 480 mW/°C above that point |
| hFE | 40–120 - DC current gain range at VCE = 1.0 V, enabling predictable base drive sizing |
| VCE(sat) | 0.5 V - Low saturation voltage at IC = 1.0 A / IB = 50 mA, minimizing conduction loss |
| fT | 40 MHz - Current gain bandwidth product, indicating usable small-signal amplification up to ~10–20 MHz |
| RθJC | 2.1 °C/W - Junction-to-case thermal resistance, supporting direct heatsink mounting for thermal management |
Pinout & Package
Package: TO-220 (3-lead, straight lead, insulated tab). Mounting surface is electrically isolated from collector.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Base | Control terminal for forward-biased injection; requires current-limited drive to achieve specified hFE |
| 2 | Collector | Main high-current output terminal; electrically connected to metal tab in TO-220 package |
| 3 | Emitter | Current return path; typically grounded or tied to low-side reference in common-emitter configurations |
Key Features
| Feature | Design Value |
|---|---|
| High current gain consistency | hFE = 40–120 across IC = 0.2–2.0 A, simplifying bias network design for stable Class-A/B amplifiers |
| Low VCE(sat) | 0.5 V at IC = 1.0 A / IB = 50 mA, reducing power loss and heat generation in saturated switching |
| Robust thermal performance | RθJC = 2.1 °C/W enables efficient heatsinking without auxiliary thermal interface layers |
| Wide operating temperature range | −55°C to +150°C junction range supports deployment in automotive engine compartments and industrial enclosures |
Applications
| Audio Power Amplifier Stage | DC Motor Driver Output Stage |
|---|---|
Use Scenario: Final push-pull output stage in 10–20 W analog audio amplifiers driving 4–8 Ω speakers. IC Role / Device Role / Timing Role: NPN complement in quasi-complementary output pair, delivering linear current amplification with minimal crossover distortion. Use Value: 4.0 A IC and 60 W PD enable clean full-power delivery into reactive loads without thermal shutdown. | Use Scenario: High-side or low-side switch in brushed DC motor control for industrial actuators and HVAC dampers. IC Role / Device Role / Timing Role: Medium-power BJT switch operating in saturation/cutoff mode under PWM control. Use Value: 0.5 V VCE(sat) minimizes resistive loss during on-state, improving efficiency and reducing heatsink requirements. |
| Linear Regulator Pass Element | Power Supply Foldback Protection |
Use Scenario: Series pass transistor in adjustable linear regulators supplying 1–3 A to sensitive analog circuitry. IC Role / Device Role / Timing Role: Voltage-controlled current source regulating output via feedback loop error amplifier. Use Value: 60 V VCEO and 150°C TJ(max) allow safe operation with ≥20 V input-to-output differentials and transient overloads. | Use Scenario: Current-limiting element in foldback protection circuits for bench power supplies and lab equipment. IC Role / Device Role / Timing Role: Sensing and limiting output current by entering saturation when IC exceeds threshold set by sense resistor. Use Value: Predictable hFE variation and low VBE(sat) (1.3 V) ensure accurate, repeatable trip points across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN power amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MJE13009 | Higher VCEO (400 V), lower hFE (min. 8), higher VCE(sat) (1.5 V @ 2 A) | Better suited for high-voltage flyback or SMPS primary switching; less optimal for linear audio due to gain and saturation trade-offs | Select MJE13009 only when >100 V blocking is required and lower gain is acceptable |
| TIP31C | Lower VCEO (100 V), same package, hFE min. 10, VCE(sat) 1.2 V @ 3 A | General-purpose alternative with reduced gain and higher saturation loss; suitable for non-critical switching but not high-fidelity linear use | Choose TIP31C only for cost-sensitive, non-audio applications where thermal margin is ample |
Compared with MJE13009 and TIP31C, the D44C8 offers superior hFE consistency and lower VCE(sat), making it more suitable for linear amplifier stages and precision current regulation where gain stability and conduction loss matter most.
Availability
D44C8 is available at Aetrix Electronics and suitable for audio power amplifiers, DC motor drivers, linear regulator pass elements, and power supply protection circuits requiring stable component supply and long-term industrial availability.
Supply support for D44C8 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
ON Semiconductor is a global semiconductor manufacturer specializing in energy-efficient power management, analog, sensors, and logic solutions for automotive, industrial, and consumer markets.
The D44C8 belongs to ON Semiconductor's legacy power bipolar transistor portfolio, originally developed by Fairchild Semiconductor for medium-power linear and switching amplification in industrial and audio systems.
FAQ
What is the maximum collector-emitter voltage rating for the D44C8?
The D44C8 has a maximum collector-emitter voltage (VCEO) rating of 60 V at TA = 25°C, verified per its Absolute Maximum Ratings table. This rating applies under open-base conditions with IC = 100 mA. Exceeding this voltage risks avalanche breakdown and permanent device failure. Designers must ensure operating VCE remains within this limit, including transients, when using the D44C8 in amplifier or switching circuits.
Does the D44C8 have a built-in diode or protection feature?
No, the D44C8 is a discrete NPN bipolar junction transistor with no integrated protection diodes, thermal shutdown, or current limiting. It contains only the three semiconductor junctions inherent to a standard BJT structure. External flyback diodes, base current limiting resistors, and heatsinking are required for safe operation in inductive load switching or linear amplification. The D44C8 datasheet confirms no internal protection features are present.
What is the pin configuration of the D44C8 in the TO-220 package?
The D44C8 uses a standard TO-220 package with pin 1 = Base, pin 2 = Collector, and pin 3 = Emitter, as explicitly shown in the "1. Base 2. Collector 3. Emitter" diagram on page 1 of the D44C8 Rev. B2 datasheet. The metal tab is electrically connected to the collector and must be insulated from the heatsink unless collector is at ground potential. This pinout is consistent across all ON Semiconductor and former Fairchild documentation for the D44C8.
Can the D44C8 be used in Class AB audio amplifier output stages?
Yes, the D44C8 is commonly used in Class AB audio output stages, particularly as the NPN half of a quasi-complementary pair. Its 4.0 A IC, 60 W PD, and hFE of 40–120 at low-to-moderate currents support stable biasing and low-distortion operation up to ~20 W into 8 Ω. Designers must ensure adequate heatsinking and proper emitter degeneration to maintain thermal stability, as confirmed in typical performance curves of the D44C8 datasheet.
What is the thermal resistance from junction to case (RθJC) for the D44C8?
The D44C8 has a specified thermal resistance from junction to case (RθJC) of 2.1 °C/W, measured under standard mounting conditions with the TO-220 tab attached to a heatsink using thermal compound. This value enables accurate junction temperature estimation using TJ = TC + (PD × RθJC). It is a key parameter for thermal design validation and appears in the Thermal Characteristics table of the official D44C8 datasheet.
D44C8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 4 A
- Voltage - Collector Emitter Breakdown (Max):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 500mV @ 50mA, 1A
- Current - Collector Cutoff (Max):
- 10µA
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 20 @ 2A, 1V
- Power - Max:
- 60 W
- Frequency - Transition:
- 40MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220-3
D44C8 FAQ
1.How can I place an order for D44C8 through Aetrix?
Please submit a Request for Quotation (RFQ) for D44C8 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 D44C8 reliable?
The price and inventory of D44C8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for D44C8 is usually 5 days.
3.What payment methods are accepted for D44C8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for D44C8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for D44C8?
D44C8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your D44C8 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 D44C8?
For technical support, including D44C8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your D44C8 requirements.
6.How does Aetrix verify that D44C8 is sourced from the original manufacturer or authorized distributors?
All D44C8 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 D44C8 meets industry standards.
7.What is the process for return or replacement of D44C8?
All D44C8 units undergo pre-shipment inspection (PSI). If there is an issue with D44C8, 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 D44C8 part is unused and in its original packaging.
Return procedure for D44C8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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