Part Details for UC3844D by onsemi
Results Overview of UC3844D by onsemi
- Distributor Offerings: (0 listings)
- Number of FFF Equivalents: (0 replacements)
- CAD Models: (Request Part)
- Number of Functional Equivalents: (4 options)
- Part Data Attributes: (Available)
- Reference Designs: (Not Available)
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Applications
Consumer Electronics
Energy and Power Systems
Renewable Energy
UC3844D Information
UC3844D by onsemi is a Switching Regulator or Controller.
Switching Regulator or Controllers are under the broader part category of Power Circuits.
A power circuit delivers electricity in order to operate a load for an electronic device. Power circuits include transformers, generators and switches. Read more about Power Circuits on our Power Circuits part category page.
Part Details for UC3844D
UC3844D CAD Models
UC3844D Part Data Attributes
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UC3844D
onsemi
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Datasheet
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UC3844D
onsemi
1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, PLASTIC, SOIC-14
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| Rohs Code | No | |
| Part Life Cycle Code | Obsolete | |
| Ihs Manufacturer | ONSEMI | |
| Part Package Code | SOIC | |
| Package Description | SOIC-14 | |
| Pin Count | 14 | |
| Reach Compliance Code | not_compliant | |
| ECCN Code | EAR99 | |
| HTS Code | 8542.39.00.01 | |
| Factory Lead Time | 4 Weeks | |
| Samacsys Manufacturer | onsemi | |
| Analog IC - Other Type | SWITCHING CONTROLLER | |
| Control Mode | CURRENT-MODE | |
| Control Technique | PULSE WIDTH MODULATION | |
| Input Voltage-Max | 25 V | |
| Input Voltage-Min | 11.5 V | |
| Input Voltage-Nom | 15 V | |
| JESD-30 Code | R-PDSO-G14 | |
| JESD-609 Code | e0 | |
| Length | 8.65 mm | |
| Moisture Sensitivity Level | 1 | |
| Number of Functions | 1 | |
| Number of Terminals | 14 | |
| Operating Temperature-Max | 70 °C | |
| Operating Temperature-Min | ||
| Output Current-Max | 1 A | |
| Package Body Material | PLASTIC/EPOXY | |
| Package Code | SOP | |
| Package Equivalence Code | SOP14,.25 | |
| Package Shape | RECTANGULAR | |
| Package Style | SMALL OUTLINE | |
| Peak Reflow Temperature (Cel) | 235 | |
| Qualification Status | Not Qualified | |
| Seated Height-Max | 1.75 mm | |
| Surface Mount | YES | |
| Switcher Configuration | SINGLE | |
| Switching Frequency-Max | 500 kHz | |
| Technology | BIPOLAR | |
| Temperature Grade | COMMERCIAL | |
| Terminal Finish | TIN LEAD | |
| Terminal Form | GULL WING | |
| Terminal Pitch | 1.27 mm | |
| Terminal Position | DUAL | |
| Width | 3.9 mm |
Alternate Parts for UC3844D
This table gives cross-reference parts and alternative options found for UC3844D. The Form Fit Function (FFF) tab will give you the options that are more likely to serve as direct pin-to-pin alternates or drop-in parts. The Functional Equivalents tab will give you options that are likely to match the same function of UC3844D, but it may not fit your design. Always verify details of parts you are evaluating, as these parts are offered as suggestions for what you are looking for and are not guaranteed.
| Part Number | Manufacturer | Composite Price | Description | Compare |
|---|---|---|---|---|
| UC3844BDR2 | onsemi | Check for Price | 1A SWITCHING CONTROLLER, 275kHz SWITCHING FREQ-MAX, PDSO14, SOIC-14 | UC3844D vs UC3844BDR2 |
| UC3844DR2 | onsemi | Check for Price | 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, PLASTIC, SOIC-14 | UC3844D vs UC3844DR2 |
| UC3842ADR2 | Motorola Mobility LLC | Check for Price | 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, PLASTIC, SO-14 | UC3844D vs UC3842ADR2 |
| UC3842BDR2 | Motorola Mobility LLC | Check for Price | 1A SWITCHING CONTROLLER, 500kHz SWITCHING FREQ-MAX, PDSO14, PLASTIC, SO-14 | UC3844D vs UC3842BDR2 |
UC3844D Frequently Asked Questions (FAQ)
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The maximum voltage rating for the UC3844D is 30V. However, the recommended operating voltage range is 12V to 28V.
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The oscillator circuit resistor values (Rt and Ct) depend on the desired switching frequency. A good starting point is to use the values recommended in the datasheet (Rt = 10kΩ, Ct = 3.3nF for 250kHz). Adjust these values based on your desired frequency and ensure the oscillator is stable.
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The soft-start pin (SS) is used to gradually increase the output voltage during startup, reducing inrush current and electromagnetic interference (EMI). Connect a capacitor (typically 10nF to 100nF) from the SS pin to ground, and a resistor (typically 1kΩ to 10kΩ) from the SS pin to the output voltage. This creates a voltage ramp during startup.
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To ensure stability, follow the datasheet's recommended layout guidelines, use a stable voltage supply, and decoupling capacitors. Verify the oscillator is working correctly by measuring the voltage on the Rt pin, which should be a triangular waveform. If the oscillator is not stable, adjust the Rt and Ct values.
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The maximum current rating for the output stage (source and sink current) is 1A. However, the recommended operating current is typically limited by the application's thermal and power requirements.