UC3844BD1013TR STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
STMicroelectronics UC3844BD1013TR is a current-mode PWM controller for flyback, boost, and forward converters, switching up to 500 kHz with 1 A gate drive output. It operates from an 11.5 V to 30 V supply and integrates slope compensation and overcurrent protection in an 8-pin SOIC. Available from stock worldwide.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- UC3844BD1013TR Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2378(MOQ 75)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of UC3844BD1013TR?
- Current-mode control with slope compensation improves loop stability and load transient response in flyback and boost topologies
- Up to 500 kHz switching frequency enables use of smaller, lower-cost transformer and filter components
- 1 A totem-pole gate driver output directly drives power MOSFETs without an external buffer transistor
- Fixed 50% maximum duty-cycle clamp protects transformer from volt-second imbalance in single-switch forward converters
What is UC3844BD1013TR used for?
The UC3844BD1013TR is a classic choice for offline flyback power supplies in the 10 W to 150 W range, including AC-DC adapters, industrial DIN-rail PSUs, and auxiliary supply stages. Its current-mode architecture with integrated gate driver simplifies control-loop compensation and reduces external component count. The 500 kHz capable oscillator and 8-pin SOIC package allow compact, high-density power board designs.
What are the specifications of UC3844BD1013TR?
| Factory Lead Time | 14Weeks |
| YTEOL | 7 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 30V |
| Input Voltage-Min | 11.5V |
| Input Voltage-Nom | 15V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 500kHz |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Nickel/Palladium/Gold (Ni/Pd/Au) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Morocco |
Where can I find the UC3844BD1013TR datasheet?
UC3844BD1013TR Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for UC3844BD1013TR?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What input voltage range does the UC3844BD1013TR support and how does that constrain flyback auxiliary supply design?
The UC3844BD1013TR requires a bias supply of 11.5 V to 30 V on its VCC pin. In a typical flyback design, the auxiliary winding must deliver at least 12 V to start the controller, and the undervoltage lockout threshold of 11.5 V prevents operation below this level, ensuring the power MOSFET is never partially driven.
How does UC3844BD1013TR's current-mode control benefit loop compensation compared to voltage-mode controllers?
Current-mode control in the UC3844BD1013TR converts the inner current loop into a first-order system, reducing the outer voltage loop to a single-pole transfer function below half the switching frequency. This simplifies compensator design to a single pole-zero network, typically a type-II op-amp circuit, and improves line-rejection by cycle-by-cycle peak current limiting.
At what maximum switching frequency can UC3844BD1013TR operate and what component size benefit does that provide?
The UC3844BD1013TR oscillator supports frequencies up to 500 kHz, set by an external resistor and capacitor on the RT/CT pins. Operating at 200 kHz to 500 kHz allows the flyback transformer core size to shrink by 4x to 6x compared to a 50 kHz design, while output filter capacitors can also be reduced to lower-value, smaller-case components.
Can UC3844BD1013TR drive a power MOSFET gate directly without an external buffer, and what is the gate drive capability?
Yes. The device includes an integrated 1 A totem-pole output stage capable of sourcing and sinking 1 A peak gate current. This is sufficient to drive MOSFETs with up to 20 nC gate charge at 500 kHz without an external buffer, simplifying the drive circuit and reducing propagation delay in the switching transition.
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Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 75+ | $0.4250 | $31.88 |
| 250+ | $0.2927 | $73.17 |
| 500+ | $0.2561 | $128.05 |
| 1000+ | $0.2378 | $237.80 |
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