UC3845BN STMicroelectronics Integrated Circuit (Dual-In-Line Packages) In Stock
UC3845BN is a current-mode PWM controller IC by STMicroelectronics. Key specs include 8.2 V to 30 V input range, 500 kHz max oscillator frequency, and DIP-8 package. Available from stock with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Dual-In-Line Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- UC3845BN Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.2847(MOQ 1)
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Current-mode control with cycle-by-cycle overcurrent limiting for superior transient response
- Wide input voltage range of 8.2 V to 30 V suits diverse power-supply topologies
- On-chip 5 V reference with 1% accuracy reduces external component count
Applications
UC3845BN is widely used in flyback, forward, and boost switch-mode power supplies for industrial and telecom equipment. Its current-mode PWM architecture enables precise output regulation and fast fault response in AC-DC and DC-DC converter designs. The device is also popular in battery chargers and motor drive auxiliary power stages requiring compact DIP-8 footprints.
Specifications
| Factory Lead Time | 14Weeks |
| YTEOL | 6 |
| 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-PDIP-T8 |
| JESD-609 Code | e3 |
| Number of Functions | 1 |
| Output Current-Max | 1A |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP8,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Qualification Status | Not Qualified |
| Surface Mount | NO |
| Switcher Configuration | SINGLE |
| Switching Frequency-Max | 500kHz |
| Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| ## UC3845BN Alternates Showing results | Image |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mainland China |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for UC3845BN:
Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, BIPolar, PDIP8
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Switching Controller, Current-mode, 1A, 500kHz Switching Freq-Max, PDIP8
Frequently Asked Questions
What input voltage range does UC3845BN support, and how does it affect power-supply design flexibility?
UC3845BN operates from 8.2 V to 30 V input, allowing it to be powered directly from a rectified auxiliary winding. This wide 8.2 V to 30 V range eliminates the need for a separate pre-regulator in most offline and telecom converter designs.
At what maximum switching frequency can UC3845BN operate, and what sets the oscillator?
The oscillator frequency can be programmed up to 500 kHz using an external resistor-capacitor network connected to the RT and CT pins. Higher frequencies above 200 kHz reduce transformer size, but switching losses must be balanced in the PCB layout.
Which converter topologies are best served by the UC3845BN current-mode control architecture?
Current-mode control in UC3845BN makes it ideal for flyback, forward, and boost converters where cycle-by-cycle peak current limiting is required. The 8-pin DIP-8 package suits single-ended topologies delivering up to approximately 100 W in offline applications.
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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 |
|---|---|---|
| 1+ | $0.3440 | $0.34 |
| 1000+ | $0.2948 | $294.80 |
| 2000+ | $0.2912 | $582.40 |
| 4000+ | $0.2847 | $1138.80 |
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