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LM7805CT

5V 1A positive linear regulator, TO-220, thermal/SCP protection

30000

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制造商零件：

LM7805CT

包装：

TO-220-3 (15.6 x 10.6 x 4.6mm, through-hole, tab=GND)

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说明

产品概览

The LM7805CT from onsemi/TI is a 3-terminal 1A positive voltage regulator providing a fixed 5V output with internal thermal shutdown and short-circuit protection in a TO-220 package — the most widely used 5V regulator in electronics.

主要规格

Output Voltage 5V fixed (±2% at 25°C for A-grade)
输出电流 1A continuous (1.5A peak)
输入电压范围 7.5V to 20V (7.5V min for regulation)
Maximum Input Voltage 35V
Dropout Voltage 2V typical @ 1A
Line Regulation 5mV typical (7.5V to 20V)
Load Regulation 10mV typical (5mA to 1A)
静态电流 5mA typical
Ripple Rejection 68dB typical @ 120Hz
Thermal Shutdown ~170°C junction
Short-Circuit Current 2.1A typical
工作温度 -40°C to +125°C (junction)
包装 TO-220-3 (through-hole, tab=GND)

特点

  • Fixed 5V output — the standard logic supply voltage
  • 1A continuous output current
  • Internal thermal overload protection
  • Internal short-circuit current limiting
  • Output transistor safe operating area protection
  • 68dB ripple rejection at 120Hz
  • Only two external capacitors needed

应用

  • 5V logic power supply
  • Microcontroller voltage regulation
  • Post-regulator after switching supply
  • Bench power supply
  • USB 5V power source

The LM7805CT from onsemi/Texas Instruments is the most ubiquitous voltage regulator in electronics, providing a fixed 5V output at up to 1A from an input of 7.5V or higher. It is the backbone of virtually every 5V logic power supply, from Arduino boards to industrial controllers. The device requires only two external capacitors (0.33µF input, 0.1µF output) for stable operation. The 2V dropout voltage means the input must be at least 7V to maintain 5V output at full load. The 68dB ripple rejection effectively attenuates AC mains ripple by a factor of 2500, making the output clean enough for sensitive analog circuits. Internal protection includes thermal shutdown (disables output at ~170°C junction), current limiting (short-circuit current limited to ~2.1A), and safe operating area compensation. The CT suffix denotes the TO-220 package. For lower dropout alternatives, the LM2940 (0.5V dropout at 1A) is preferred when input voltage is close to 5V.

The LM7805CT uses a series pass transistor (NPN Darlington) between the input and output, controlled by a feedback loop that compares a fraction of the output voltage with an internal bandgap reference. When the output voltage drops below 5V, the error amplifier increases the drive to the pass transistor, increasing current flow. When the output rises above 5V, the drive is reduced. The thermal protection circuit monitors the junction temperature; at ~170°C, the pass transistor is disabled until the device cools. The current limiting circuit limits the pass transistor current to approximately 2.1A during a short circuit. The safe operating area (SOA) protection further reduces the current limit as the input-output voltage differential increases. The 5mA quiescent current flows through the ground pin and biases the internal reference and error amplifier. The 0.33µF input capacitor prevents oscillation when the source impedance is high, and the 0.1µF output capacitor improves transient response.

针脚 名称 类型 说明
1 INPUT 电源输入 Unregulated input voltage. Must be at least 3.0V (Vout + Vdropout ≈ 3.0V) for proper regulation. Maximum 35V. Bypass with 0.33µF ceramic capacitor to GND if supply is more than 6 inches from the regulator.
2 接地 地面 Common ground reference. The TO-220 tab is electrically connected to this pin and serves as the primary heat dissipation path. Use thermal compound and heatsink for currents above 500mA.
3 OUTPUT 功率输出 Regulated 0.5V DC output at up to 1A continuous current with ±4% tolerance. Bypass with 0.1µF ceramic capacitor to GND to improve transient response and output impedance. Do not apply external voltage higher than 0.5V to prevent reverse bias damage.

Pin assignment follows standard TO-220-3 layout: Pin 1 (left) = Input, Pin 2 (center) = Ground/Tab, Pin 3 (right) = Output, when viewed from the front with pins pointing down. The metal tab on the back is electrically connected to Pin 2 (GND) and must be insulated from the heatsink when the heatsink is not at ground potential. Output capacitance of 0.1µF is required for stability; input capacitance of 0.33µF is recommended when the input supply is remote.

  • 5V MCU Supply: 9V battery or wall adapter → LM7805CT → 5V for MCU, TTL logic, sensors; 0.33µF + 0.1µF caps
  • Arduino Power: 12V DC jack → LM7805CT → 5V rail; Pdiss = (12-5)×0.5A = 3.5W; small heatsink needed
  • Post-SMPS: 7.5V switching supply → LM7805CT → clean 5V; 68dB ripple rejection eliminates switcher noise
  • USB Power: 9V battery → LM7805CT → 5V USB output; charges phone or powers USB device
  • Split Supply: LM7805CT (+5V) + LM7905CT (-5V) from center-tapped transformer; ±5V for op-amp circuits
模型 制造商 主要区别 包装 Specs
LM7805ACT onsemi Tighter output tolerance: ±2% vs ±4% for precision power supply applications TO-220-3 0.5V/1A
L7805CV 意法半导体 Direct equivalent with 1.5A output current, internal thermal shutdown and current limiting TO-220-3 0.5V/1.5A
MC7805CTG onsemi Current production replacement with identical electrical specifications and RoHS compliance TO-220-3 0.5V/1A
KA7805 onsemi/Fairchild Budget-friendly version with ±4% tolerance and standard 1A output current rating TO-220-3 0.5V/1A
MC7805ABD2TG onsemi Surface-mount DPAK version with ±2% A-grade tolerance for compact PCB layouts DPAK-3 0.5V/1A
LM2940CT-0.5 TI Low-dropout version with 0.5V max dropout at 1A for battery-powered and automotive systems TO-220-3 0.5V/1A LDO

LM7805CT is a 0.5V fixed positive voltage regulator in TO-220-3 with 1A output and ±4% tolerance. The ACT suffix offers ±2% precision. For surface-mount designs, use MC7805ABD2TG (DPAK). For battery-powered systems, the LM2940CT-0.5 LDO version reduces dropout to 0.5V. All 7805 variants are pin-compatible (IN-GND-OUT) and require only input/output capacitors.

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质量保证

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

3. Industry Standard Compliance

Our products comply with a variety of international industry quality standards to adapt to high-standard application scenarios:
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4. Professional Reliability Control

For static-sensitive, moisture-sensitive and precision components such as ICs, PCBs, sensors and connectors, we carry out reliability screening in advance. Combined with standardized ESD anti-static packaging and vacuum moisture-proof packaging, we avoid component damage caused by static electricity, dampness or collision during storage and transportation, and retain the original performance of products.

5. Traceability Management System

We establish a complete product traceability system. Each batch of goods corresponds to independent batch number, sourcing record, inspection record and delivery record. Customers can query the whole lifecycle information of components at any time. This system effectively solves quality risks and facilitates after-sales handling and production quality control for your company.

6. After-sales Quality Guarantee

If any product is confirmed to have non-conformity quality problems due to our reasons after receipt, we provide free return, exchange and supplementary delivery services. Our professional quality team will also conduct root cause analysis to optimize our quality control process. We respond to quality feedback within 24 hours to resolve your worries efficiently.

联系我们

If you have inquiries about our quality standards, inspection procedures or product certification documents, please feel free to contact us:

 

Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

发货与付款

Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

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5. Local Pickup in Shenzhen

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  • Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
  • Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
  • Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.

Contact Information

Email: info@materialparts.com

Tel / WhatsApp: +86 13760382860

服务与包装

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

Core Services

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We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

3. Fast Quotation & Order Processing

Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

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6. Global Logistics & Document Services

We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

1. General Packaging Specifications

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  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
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  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

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We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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