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LM337IMP

Adjustable negative LDO, -1.2V to -37V output, 1A, SOT-223-4, complement to LM317, obsolete

3260

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جزء الشركة المصنعة ： جزء الشركة المصنعة

LM337IMP

الحزمة ： الحزمة

SOT-223-4 (TO-261-4, 6.5 x 3.5mm)

العلامة التجارية ： العلامة التجارية
فئات المنتجات:：فئات المنتجات
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الوصف

نظرة عامة على المنتج

The LM337IMP is an adjustable 3-terminal negative voltage regulator from Texas Instruments, capable of supplying up to 1A output current over an output voltage range of -1.2V to -37V. Packaged in a surface-mount SOT-223-4, it requires only two external resistors to set the output voltage. The device features internal current limiting, thermal shutdown, and safe-area compensation, making it virtually blowout-proof.

المواصفات الرئيسية

نوع الإخراج Adjustable Negative
Output Voltage Range -1.2V to -37V
تيار الإخراج 1A (SOT-223 package)
نطاق جهد الإدخال -4.2V to -40V
Reference Voltage -1.250V (typical)
Line Regulation 0.01%/V (typical)
Load Regulation 0.3% (typical)
Ripple Rejection 77dB (typical)
جهد التسرب 1.9V (typical)
الحزمة SOT-223-4 (6.5 x 3.5mm)
درجة حرارة التشغيل -40 درجة مئوية إلى +125 درجة مئوية
Status Obsolete (replaced by LM337IMP/NOPB)

الميزات

  • Output voltage adjustable from -1.2V to -37V
  • 1A output current in SOT-223 package (2W dissipation)
  • Only 2 external resistors required to set output voltage
  • 0.01%/V line regulation
  • 77dB ripple rejection
  • Internal thermal overload protection
  • Internal short-circuit current limiting
  • Safe-area compensation
  • Complement to LM317 positive regulator

التطبيقات

  • Negative supply rails for op-amp circuits
  • Split-rail power supplies (with LM317)
  • Adjustable lab power supplies
  • Bias voltage generators for RF circuits
  • Industrial control and instrumentation
  • Audio amplifier dual-rail supplies

The LM337IMP is an adjustable 3-terminal negative voltage regulator from Texas Instruments, providing output voltages from -1.2V to -37V at up to 1A load current in the SOT-223-4 surface-mount package. It is the negative complement to the LM317 positive regulator, and together they can form a complete split-rail power supply. The device requires only two external resistors to program the output voltage. Internal protection includes current limiting, thermal shutdown, and safe-area compensation, making the device essentially indestructible under normal operating conditions. Note: This specific part number (LM337IMP) is obsolete; the replacement is LM337IMP/NOPB.

The LM337IMP maintains a constant -1.25V reference between the output (VOUT) and adjustment (ADJ) pins. An external resistor R1 connected between VOUT and ADJ establishes a constant current through the voltage divider. A second resistor R2 from ADJ to ground sets the output voltage: VOUT = -1.25V × (1 + R2/R1). The adjustment pin draws a small quiescent current (65µA typical) which contributes a negligible error term. The internal pass transistor regulates by controlling the current flow from input to output, maintaining the desired output voltage despite changes in load current or input voltage. The dropout voltage of approximately 1.9V means the input must be at least 1.9V more negative than the output for proper regulation.

دبوس الاسم الوصف
1 ADJ Adjustment terminal (connects to voltage divider)
2 VOUT Regulated output voltage (-1.2V to -37V)
3 VIN Unregulated input voltage (-4.2V to -40V)
4 (Tab) VOUT Output (connected to pin 2, heat sink tab)
  • Dual-Rail Op-Amp Supply: Pair the LM337IMP with an LM317 to create ±15V or ±12V supplies for dual-supply op-amps. Connect the LM337’s output to the negative rail and the LM317’s output to the positive rail. Use matched resistor dividers for symmetric output voltages. Add 10µF bypass capacitors at ADJ pins for improved ripple rejection.
  • Adjustable Negative Lab Supply: Use a potentiometer for R2 to create a continuously adjustable negative supply from -1.2V to -30V. Add protection diodes to prevent damage from output-to-input shorts or ADJ pin capacitor discharge during output short-circuit events.
  • RF Bias Voltage Generator: Generate precise negative gate bias voltages for GaAs FETs or PHEMTs in RF power amplifiers. The 77dB ripple rejection and low output noise ensure stable bias conditions for optimal RF performance.
الطراز المخرجات Current الحزمة الفرق الرئيسي
LM337IMP/NOPB -1.2V to -37V 1A SOT-223 Direct replacement (active)
LM337BD2TG -1.2V to -37V 1.5A D2PAK Higher current, TO-263
TPS7A33 -0.9V to -18V 1A VSON-10 Lower noise, higher PSRR
LT1175 -2.5V to -25V 500 مللي أمبير SOIC-8 Low dropout, ADI alternative
LM337T -1.2V to -37V 1.5A TO-220 Through-hole, higher power
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ضمان الجودة

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

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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.

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

 

الشحن والدفع

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.

1. Payment Terms

We offer a variety of secure and convenient payment methods to meet diverse business cooperation needs. Details are as follows:
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    US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.

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    We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.

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5. Local Pickup in Shenzhen

Local pickup service is available for customers in Shenzhen and surrounding areas:
  • 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

الخدمة والتغليف

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

1. One-stop Sourcing & BOM Support

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.

4. Professional Technical Support

Our senior engineer team provides free technical consultation, model selection guidance and original manufacturer datasheets. We assist customers in solving problems related to product R&D, circuit design and component application, providing reliable technical support for project progress.

5. Sourcing for Special Components

Relying on our global supply chain network, we professionally source scarce components, obsolete parts and customized special components to efficiently solve your procurement difficulties.

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

  • All components are packed separately to avoid damage caused by friction and collision;
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  • Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.

2. Classified Professional Packaging

  • Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
  • Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
  • 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.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

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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