UC3845BD1013TR STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
UC3845BD1013TR is a current-mode PWM controller for boost and flyback power supplies by STMicroelectronics in an 8-pin SOIC package. Key specs: 8.2 V to 30 V input, 500 kHz switching frequency, 1 A gate drive output, fixed-frequency pulse-width modulation with peak current limiting. From $0.70, in stock with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- UC3845BD1013TR Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.3210(MOQ 16)
- 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 UC3845BD1013TR?
- Current-mode control with cycle-by-cycle peak current limiting provides inherent short-circuit protection and simplified loop compensation for boost and flyback designs
- 500 kHz maximum switching frequency enables compact magnetics with inductors and transformers down to 10 µH for high power density converter layouts
- 8.2 V UVLO threshold with 8-pin SOIC package allows direct use in offline and 12 V to 24 V bus converters with minimal external component count
What is UC3845BD1013TR used for?
UC3845BD1013TR is used in isolated flyback converters, boost PFC stages, and offline AC/DC power supplies operating from 8.2 V to 30 V input rails. It is suitable for industrial power modules, SMPS designs, and battery-powered equipment where current-mode control simplifies compensation and improves transient response at switching frequencies up to 500 kHz.
What are the specifications of UC3845BD1013TR?
| YTEOL | 7 |
| Analog IC - Other Type | SWITCHING CONTROLLER |
| Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION |
| Input Voltage-Max | 30V |
| Input Voltage-Min | 8.2V |
| 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 |
| ## UC3845BD1013TR Alternates Showing results | Image |
| 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 UC3845BD1013TR datasheet?
UC3845BD1013TR Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for UC3845BD1013TR?
Compatible alternatives and drop-in replacements for UC3845BD1013TR:
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDSO8
suggested
suggested
Frequently Asked Questions
How does the current-mode control in UC3845BD1013TR simplify compensation compared to voltage-mode controllers?
Current-mode control in UC3845BD1013TR senses peak inductor current each switching cycle, making the inner current loop behave like a controlled current source. This converts the double-pole LC filter response into a single-pole system, simplifying the outer voltage loop compensation to a single-pole or Type-II network rather than a Type-III compensator needed for voltage-mode designs.
What is the maximum switching frequency of UC3845BD1013TR, and how does it affect transformer size in a flyback design?
UC3845BD1013TR supports switching frequencies up to 500 kHz, set by an external resistor and capacitor on the RT/CT pins. Operating at 500 kHz reduces required transformer inductance by roughly 25× compared to 20 kHz designs, enabling core volumes below 1 cm³ for converter outputs up to 20 W.
Over what input voltage range does UC3845BD1013TR operate, and what undervoltage lockout threshold protects startup?
UC3845BD1013TR operates from 8.2 V to 30 V input. Its undervoltage lockout (UVLO) turns on the controller at 8.2 V and shuts it off below 7.6 V, providing a 0.6 V hysteresis window that prevents chattering during startup from a slowly rising supply rail in boost or flyback converter stages.
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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 |
|---|---|---|
| 16+ | $0.3210 | $5.14 |
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