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ST UC3843B
onsemi ANA SMPS PWM CONTROLLER
Brands: STMicroelectronics, Inc
Mfr.Part #: UC3843B
Datasheet: UC3843B Datasheet (PDF)
Package/Case: SOP-8DIP8
RoHS Status:
Stock Condition: 2587 pcs, New Original
Product Type: Integrated Circuits (ICs)
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*All prices are in USD
| Qty | Unit Price | Ext Price |
|---|---|---|
| 5 | $0.184 | $0.920 |
| 50 | $0.149 | $7.450 |
| 150 | $0.132 | $19.800 |
| 500 | $0.102 | $51.000 |
| 2500 | $0.098 | $245.000 |
| 5000 | $0.095 | $475.000 |
In Stock:2587 PCS
UC3843B General Description
The UC3843B is an integrated circuit (IC) that belongs to the UCx84x family of voltage-mode pulse-width modulation (PWM) controllers. These ICs are commonly used in power supply and voltage regulation applications. The UC3843B specifically is known for its use in switch-mode power supplies and voltage regulation circuits.
Features
Voltage-Mode PWM Controller: The UC3843B is primarily designed as a voltage-mode PWM controller. It is used to regulate the output voltage of power supplies by adjusting the duty cycle of a pulse-width modulated signal.
Wide Input Voltage Range: It can operate with a wide input voltage range, making it suitable for various power supply designs.
Current Limiting: The IC typically includes a current limiting function, which helps protect the power supply and load by limiting the output current in the event of a fault or overload condition.
Soft-Start Capability: Many designs using the UC3843B incorporate a soft-start feature to gradually ramp up the output voltage, reducing stress on components during startup.
Error Amplifier: It features an error amplifier that compares the output voltage with a reference voltage and generates an error signal used to adjust the duty cycle of the PWM signal.
Output Drivers: The IC has output drivers for driving an external power transistor or MOSFET, which controls the power supplied to the load.
Frequency Compensation: To maintain stability in the feedback loop, the UC3843B includes provisions for frequency compensation, typically using an external capacitor.
Voltage Reference: It may have an internal voltage reference or require an external reference voltage for regulating the output.
Protection Features: Some variants of the UC3843B include protection features like overvoltage protection (OVP) and undervoltage lockout (UVLO) to enhance the safety and reliability of power supply systems.
Package Options: The UC3843B is available in various package options, including DIP (Dual In-Line Package) and surface-mount packages, making it adaptable to different circuit designs.
Application
- AC-DC power supplies
- DC-DC converters
- LED drivers
- Battery chargers
- Audio amplifiers
Specifications
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Source Content uid | UC3843B | Pbfree Code | Yes |
| Rohs Code | Yes | Part Life Cycle Code | Active |
| Ihs Manufacturer | STMICROELECTRONICS | Part Package Code | DIP |
| Package Description | PLASTIC, DIP-14 | Pin Count | 14 |
| Reach Compliance Code | compliant | ECCN Code | EAR99 |
| HTS Code | 8542.39.00.01 | Samacsys Manufacturer | STMicroelectronics |
| Analog IC - Other Type | SWITCHING CONTROLLER | Control Mode | CURRENT-MODE |
| Control Technique | PULSE WIDTH MODULATION | Input Voltage-Max | 25 V |
| Input Voltage-Min | 12 V | Input Voltage-Nom | 15 V |
| JESD-30 Code | R-PDIP-T14 | JESD-609 Code | e3 |
| 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 | DIP | Package Equivalence Code | DIP14,.3 |
| Package Shape | RECTANGULAR | Package Style | IN-LINE |
| Qualification Status | Not Qualified | Seated Height-Max | 5.1 mm |
| Surface Mount | NO | Switcher Configuration | SINGLE |
| Switching Frequency-Max | 500 kHz | Technology | BIPOLAR |
| Temperature Grade | COMMERCIAL | Terminal Finish | MATTE TIN |
| Terminal Form | THROUGH-HOLE | Terminal Pitch | 2.54 mm |
| Terminal Position | DUAL |
Shipping
| Shipping Type | Ship Fee | Lead Time | |
|---|---|---|---|
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DHL | $20.00-$40.00 (0.50 KG) | 2-5 days |
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Fedex | $20.00-$40.00 (0.50 KG) | 2-5 days |
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UPS | $20.00-$40.00 (0.50 KG) | 2-5 days |
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TNT | $20.00-$40.00 (0.50 KG) | 2-5 days |
 |
EMS | $20.00-$40.00 (0.50 KG) | 2-5 days |
 |
REGISTERED AIR MAIL | $20.00-$40.00 (0.50 KG) | 2-5 days |
Processing Time：Shipping fee depend on different zone and country.
Payment
| Terms of payment | Hand Fee | |
|---|---|---|
 |
Wire Transfer | charge US$30.00 banking fee. |
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Paypal | charge 4.0% service fee. |
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Credit Card | charge 3.5% service fee. |
 |
Western Union | charge US.00 banking fee. |
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Money Gram | charge US$0.00 banking fee. |
Guarantees
1.The electronic components you purchase include 365 Days Warranty, We guarantee product quality.
2.If some of the items you received aren't of perfect quality, we would resiponsibly arrange your refund or replacement. But the items must remain their orginal condition.
Packing
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Step1 :Product
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Step2 :Vacuum packaging
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Step3 :Anti-static bag
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Step4 :Individual packaging
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Step5 :Packaging boxes
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Step6 :bar-code shipping tag
All the products will packing in anti-staticbag. Ship with ESD antistatic protection.
Outside ESD packing’s lable will use ourcompany’s information: Part Mumber, Brand and Quantity.
We will inspect all the goods before shipment,ensure all the products at good condition and ensure the parts are new originalmatch datasheet.
After all the goods are ensure no problems afterpacking, we will packing safely and send by global express. It exhibitsexcellent puncture and tear resistance along with good seal integrity.
Equivalent Parts
For the UC3843B component, you may consider these replacement and alternative parts:
Part Number
Brands
Package
Description
Part Number : TL3843P
Brands :
Package :
Description :
Part Number : SG3843M
Brands :
Package :
Description :
Part Number : KA3843B
Brands :
Package :
Description :
Part Number : MC3843B
Brands :
Package :
Description :
Part Number : IR3843B
Brands :
Package :
Description :
Part Number : FAN3843B
Brands :
Package :
Description :
Part points
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The UC3843B is a highly versatile pwm (pulse width modulation) controller chip commonly used in power supply applications. it is designed to regulate the output voltage by adjusting the duty cycle of the switching transistor, enabling efficient and stable power conversion. the chip features precision voltage reference, oscillator, error amplifier, and soft start function, making it suitable for various power management tasks.
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Equivalent
Some equivalent products of the UC3843B chip include the uc3843a, uc3843ad1, UC3843Bd1, UC3843Bv, and UC3843Bvdr2g. -
Features
The features of UC3843B include high-performance pwm controller with adjustable frequency, current-mode operation for superior transient response, low-power standby mode, precision voltage reference, integrated error amplifier, and soft-start function. it also provides protection features like under-voltage lockout and thermal shutdown for reliable operation. -
Pinout
The UC3843B is a 8-pin integrated circuit (ic) controller. its pins are: vfb (feedback voltage input), comp (error amplifier output), cs (current sense input), gnd (ground), rt/ct (resistor-capacitor timing components), vcc (voltage input), out (output), and sync (synchronization input). it is commonly used in power supply applications for regulating voltage. -
Manufacturer
The UC3843B is manufactured by texas instruments, a semiconductor company. they design, manufacture, and sell a range of electronics and analog integrated circuits for various applications including automotive, industrial, consumer electronics, and more. -
Application Field
The UC3843B is commonly used in power management applications such as switch mode power supplies, battery chargers, and led drivers. it is also used in many other applications requiring precise and efficient control of power. -
Package
The UC3843B chip is available in a 8-pin pdip (plastic dual in-line package) form. the package dimensions are approximately 9.81mm x 6.35mm x 3.3mm.
Datasheet PDF
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