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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - DC DC Switching ControllersUC2845AQDR
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UC2845AQDR - Texas Instruments

Manufacturer Part Number
UC2845AQDR
Manufacturer
Texas Instruments
Allelco Part Number
32D-UC2845AQDR
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
38,460 pcs available, New & Original
Parts Description
IC REG CTRLR MULT TOP 14SOIC
Package
14-SOIC
Data sheet
UC2845AQDR.pdf

HTML Datasheet

UC2845AQD.pdf

PCN Assembly/Origin

2.73KHz.pdf
RoHs Status
ROHS3 Compliant
Compare
Our certification
In stock: 38460
  • Unit Price: $1.239
  • Subtotal: $0.00

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Quantity Unit Price Ext. Price
1+ $1.239 $1.24
200+ $0.479 $95.80
500+ $0.463 $231.50
1000+ $0.454 $454.00
The above prices does not include taxes and freight rates, which will be calculated on the order pages.

Specifications

UC2845AQDR Tech Specifications
Texas Instruments - UC2845AQDR technical specifications, attributes, parameters and parts with similar specifications to Texas Instruments - UC2845AQDR

Product Attribute Attribute Value
Manufacturer Texas Instruments
Voltage - Supply (Vcc/Vdd) 7.6V ~ 30V
Topology Boost, Buck, Flyback, Forward
Synchronous Rectifier No
Supplier Device Package 14-SOIC
Series Automotive, AEC-Q100
Serial Interfaces -
Package / Case 14-SOIC (0.154', 3.90mm Width)
Package Tape & Reel (TR)
Output Type Transistor Driver
Output Phases 1
Product Attribute Attribute Value
Output Configuration Positive, Isolation Capable
Operating Temperature -40°C ~ 125°C (TJ)
Number of Outputs 1
Mounting Type Surface Mount
Function Step-Up, Step-Up/Step-Down
Frequency - Switching Up to 500kHz
Duty Cycle (Max) 48%
Control Features Frequency Control
Clock Sync No
Base Product Number UC2845

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

UC2845AQDR Image
UC2845AQDR (1)

Manufacturer Part Number

UC2845AQDR

Manufacturer

Texas Instruments

Introduction

The UC2845AQDR is from Texas Instruments' category of PWM controllers designed specifically for sophisticated power management. It is tailored to optimize the performance of power supply systems.

Product Features and Performance

PWM (Pulse Width Modulation) Controller

High performance and reliability

Operates over a wide input voltage range (-0.3V ~ 6.3V)

Requires a supply voltage of 7.9V ~ 30V

Modest supply current requirement at 11 mA

Operational over a broad temperature range (-40°C ~ 125°C)

Engineered for surface mount technology

Product Advantages

Enhanced power efficiency

Stable operation under varying environmental conditions

Versatile power input specifications

Low power consumption

High durability and robustness in challenging conditions

Key Technical Parameters

Voltage Input: -0.3V ~ 6.3V

Voltage Supply: 7.9V ~ 30V

Current Supply: 11 mA

Operating Temperature: -40°C ~ 125°C

Mounting Type: Surface Mount

Package / Case: 14-SOIC

Quality and Safety Features

Built with industry-grade materials for durability

Complies with relevant international safety standards

Thermal regulation features to prevent overheating during operation

Compatibility

Compatible with a variety of circuit architectures requiring PWM control

Adaptable for use in different power management systems due to flexible voltage input and supply requirements

Application Areas

Telecommunications

Consumer Electronics

Industrial Power Systems

Product Lifecycle

Currently in active production status

Not nearing discontinuation

Support for replacements or upgrades available

Several Key Reasons to Choose This Product

Precision in control with PWM technology ensuring efficient power management

Reliable in extreme temperatures making it ideal for harsh environmental applications

Highly compatible and adaptable for multiple applications

Strong support from Texas Instruments including documentation and customer service

Future-proof design with continued availability of parts and upgrades

Frequently Asked Questions(FAQ)

How does the UC2845AQDR's supply voltage range compare to other PWM controllers in similar applications, and what design considerations arise from this?
The UC2845AQDR operates with a supply voltage ranging from 7.9V to 30V, which is relatively wide compared to many integrated power controllers. This range supports robust performance across various industrial and telecom power systems where input fluctuations are common. When designing with this device, engineers must ensure that the minimum supply of 7.9V remains stable under transient conditions, especially during startup or load transients. Additionally, while the upper limit of 30V accommodates standard rectified DC bus levels, it necessitates careful selection of decoupling capacitors and layout practices to prevent voltage overshoots that could stress internal components.
What are the implications of the UC2845AQDR’s -0.3V to 6.3V input voltage tolerance on circuit protection and signal integrity in high-noise environments?
The UC2845AQDR can tolerate input signals as low as -0.3V and up to 6.3V, which exceeds typical logic thresholds but introduces design challenges in noise immunity and ESD protection. In high-noise environments such as motor drives or switching power supplies, this wide tolerance window may allow transient glitches to trigger unintended shutdowns or oscillations unless filtered effectively at the input stage. Designers should implement proper clamping diodes and RC filtering networks to keep the input within safe limits while preserving fast response characteristics critical for PWM regulation accuracy.
Can the UC2845AQDR be used in automotive applications given its operating temperature range and package type?
While the UC2845AQDR operates over -40°C to 125°C (TA), which meets basic industrial standards, automotive qualification typically requires additional reliability testing beyond commercial-grade components. The 14-SOIC package provides adequate thermal performance for moderate power dissipation scenarios, but without AEC-Q100 certification, direct use in safety-critical automotive systems is not recommended. However, it may still be suitable for non-safety-related automotive peripherals if derating and environmental stress screening are applied.
How does the UC2845AQDR’s current consumption of 11 mA impact efficiency in battery-powered or energy-sensitive designs?
At 11 mA typical supply current, the UC2845AQDR consumes more power than ultra-low-power PWM controllers but offers full-featured functionality. In battery-powered applications like portable instrumentation or IoT edge devices, this quiescent current can significantly affect overall system runtime—especially when combined with frequent switching cycles. To mitigate impact, designers might opt for duty-cycle control strategies or use sleep modes where supported by downstream converters, though the UC2845 itself lacks deep sleep capability.
What layout precautions are necessary when implementing the UC2845AQDR in a high-frequency switching regulator due to its SOIC packaging and pin configuration?
The 14-pin SOIC package of the UC2845AQDR has limited thermal pad exposure compared to larger packages, requiring careful PCB layout to manage parasitic inductance and capacitance. High dv/dt nodes near feedback pins must be isolated from noisy traces to maintain stability, and ground return paths should minimize loop area to reduce EMI. Additionally, the small lead pitch demands precise soldering and stencil design to avoid opens or shorts during assembly, particularly in automated pick-and-place manufacturing.
How does the UC2845AQDR’s error amplifier gain bandwidth product influence compensation network design in a voltage-mode buck converter?
Although not explicitly listed in the datasheet, the UC2845 features an internal error amplifier with sufficient gain-bandwidth product (~1 MHz typical) to support second-order loop compensation in medium-bandwidth applications. For a voltage-mode buck converter targeting crossover frequencies below 20 kHz, this enables stable operation with Type II or Type III compensators using standard ceramic capacitors. Engineers must validate phase margin through simulation or bench testing, as excessive ESR from output capacitor choices can degrade performance despite adequate theoretical headroom.
What are the key differences between the UC2845AQDR and its substitutes like the UC2845BDG regarding pin compatibility and electrical characteristics?
The UC2845AQDR shares the same 14-pin SOIC footprint and pinout as substitutes such as the UC2845BDG, enabling mechanical drop-in replacement. However, minor variations exist in propagation delay, rise/fall times, and absolute maximum ratings between sub-variants, which can affect switching timing margins in tightly synchronized multi-phase designs. While most functional blocks remain consistent, designers should verify timing diagrams and thermal derating curves for each variant to ensure consistent performance across production batches.
Why might a designer choose the UC2845AQDR over discrete PWM controller solutions despite its higher component count?
The UC2845AQDR integrates essential functions—oscillator, comparator, error amplifier, and gate driver—into a single IC, reducing external part count and board space compared to discrete implementations. This integration simplifies calibration, improves matching between timing elements, and accelerates time-to-market. Though slightly less customizable than pure analog solutions, the UC2845 offers proven robustness and fault protection features like undervoltage lockout, making it preferable for mass-produced, reliability-driven applications.
How does moisture sensitivity level (MSL) classification of MSL 1 affect handling and storage requirements for the UC2845AQDR in manufacturing?
Classified as MSL 1, the UC2845AQDR has unlimited floor life at <30°C/60% RH, simplifying inventory management and reducing drying oven usage during reflow. This makes it ideal for high-volume assembly lines where rapid turnaround is essential. No special packaging beyond standard moisture barrier bags with desiccant is required prior to use, lowering logistics complexity and cost versus higher MSL parts.
What role does RoHS compliance play in global market access for products incorporating the UC2845AQDR?
As a RoHS3 compliant device, the UC2845AQDR contains no restricted substances such as lead, mercury, or cadmium above threshold limits, allowing unrestricted sale into EU, North American, and Asian markets including China and South Korea. This compliance avoids customs delays and labeling requirements, facilitating streamlined global distribution without modification to sourcing strategy.
How does the absence of an internal soft-start feature in the UC2845AQDR affect inrush current management during power-up?
The UC2845AQDR lacks built-in soft-start circuitry, requiring external implementation via a capacitor on the CT pin or dedicated soft-start pin (if available). Without this, turn-on occurs abruptly, potentially causing large inrush currents that stress input capacitors and upstream regulators. Designers must add external soft-start circuits—typically an RC network charging slowly to set initial oscillator frequency—to limit peak current and ensure controlled ramp-up, especially in capacitive-load-rich systems.
Can the UC2845AQDR drive multiple MOSFETs directly, and what limitations apply to gate drive strength?
The UC2845AQDR provides complementary push-pull outputs capable of driving moderate-sized MOSFET gates directly, but its peak sink/source current is limited to approximately 1A short-term (per datasheet). For high-speed switching with large gate charge MOSFETs (>10 nC), an external gate driver IC is advisable to reduce switching losses and improve efficiency. Direct driving is acceptable for smaller transistors in lower-frequency topologies (<200 kHz), but performance degrades with increased gate capacitance due to slower rise/fall times.
What impact do supply rail transients have on the UC2845AQDR’s reference stability, and how should decoupling be implemented?
The UC2845AQDR relies on an internal bandgap reference, but its accuracy can drift with supply rail transients above 25V or during rapid voltage changes. To maintain precision, a low-ESR ceramic capacitor (≥10 µF) should be placed within 5 mm of the VCC pin, supplemented by a 0.1 µF bypass capacitor for high-frequency noise suppression. Layout must avoid coupling switching noise from adjacent power stages directly onto the VCC trace to preserve regulation loop integrity.
How does the UC2845AQDR’s temperature range interact with long-term reliability in outdoor or industrial installations?
Operating from -40°C to 125°C ensures functionality across extreme climates, but long-term reliability depends on junction temperature management. In high-ambient environments exceeding 85°C, thermal derating of output current or switching frequency may be necessary to stay within safe operating areas. The SOIC package’s relatively low thermal resistance (~100°C/W) means heat dissipation must be carefully modeled; otherwise, accelerated aging or early failure could occur despite nominal specs being met.
What are the consequences of using the UC2845AQDR outside its specified input voltage range during transient events?
Exceeding the -0.3V to 6.3V input range—such as during negative transients from inductive loads—can damage the internal ESD protection diodes or latch up CMOS structures, leading to permanent failure. Similarly, exceeding 6.3V on control inputs risks oxide breakdown. Proper input conditioning with TVS diodes and series resistors is essential in harsh environments to clamp voltages within safe limits and protect the device during real-world transients.
How does the UC2845AQDR’s lack of built-in current sensing affect overcurrent protection implementation?
Since the UC2845AQDR does not include integrated current sense amplifiers or comparators, external circuitry—such as a shunt resistor with differential amplifier or Hall-effect sensor—is required for accurate current limiting. This adds component count and potential offset errors but allows flexibility across different topologies (buck, boost, flyback). Designers must ensure protection thresholds account for amplifier gain tolerances (±1%) and propagation delay to avoid undershoot during fault conditions.
In what scenarios would substituting the UC2845AQDR with the UC2845BDR2G provide measurable benefits, and are there any trade-offs?
The UC2845BDR2G is functionally identical to the UC2845AQDR but differs in reel packaging and possibly revision-level improvements (e.g., yield enhancements or minor process refinements). Substitution is generally seamless for automated assembly, offering no electrical advantage but potentially better consistency in high-volume production. However, if the original part is discontinued, the BDR2G serves as a reliable alternative without redesign effort, assuming equivalent availability and pricing.

Parts with Similar Specifications

The three parts on the right have similar specifications to Texas Instruments UC2845AQDR

Product Attribute UC2845AQD8R UC2845AQD8 UC2845AQD UC2845AQ
Part Number UC2845AQD8R UC2845AQD8 UC2845AQD UC2845AQ
Manufacturer Texas Instruments Texas Instruments Texas Instruments Texas Instruments
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
Voltage - Supply (Vcc/Vdd) - - - -
Synchronous Rectifier - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Series - - - -
Number of Outputs - - - -
Function - - - -
Frequency - Switching - - - -
Control Features - - - -
Duty Cycle (Max) - - - -
Topology - - - -
Output Configuration - - - -
Serial Interfaces - - - -
Clock Sync - - - -
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Output Phases - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Output Type - Current - Unbuffered Voltage - Buffered -
Base Product Number - DAC34H84 MAX500 ADS62P42

UC2845AQDR Datasheet PDF

Download UC2845AQDR pdf datasheets and Texas Instruments documentation for UC2845AQDR - Texas Instruments.

Datasheets
Cylindrical Battery Holders.pdf
HTML Datasheet
UC2845AQD.pdf
PCN Assembly/Origin
2.73KHz.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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UC2845AQDR Image

UC2845AQDR

Texas Instruments
32D-UC2845AQDR

Want a better price? Add to Cart and Submit RFQ now, we'll contact you immediately.

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