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BUF634P

250mA Hi-Speed Buffer, 2000V/us, 30-180MHz, PDIP-8

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جزء الشركة المصنعة ： جزء الشركة المصنعة

BUF634P

الحزمة ： الحزمة

8-Pin PDIP (9.81 x 6.35 x 5.08 mm, 2.54mm pitch)

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

نظرة عامة على المنتج

The BUF634P from Texas Instruments (formerly Burr-Brown) is a 250mA high-speed open-loop buffer with 2000V/us slew rate, pin-selectable 30-180MHz bandwidth, and 8-pin PDIP package.

المواصفات الرئيسية

النوع 250mA High-Speed Unity-Gain Open-Loop Buffer
تيار الإخراج +/-250 mA (continuous)
معدل الدوران 2000 V/us
Bandwidth 30 MHz (low Iq mode) to 180 MHz (wide BW mode)
Gain 0.99 V/V @ RL=1kOhm; 0.93 @ RL=100Ohm (wide BW)
جهد الإمداد +/-2.25V to +/-18V (4.5V to 36V total)
تيار التهدئة 1.5 mA (low Iq, 30MHz BW); 15 mA (wide BW, 180MHz)
جهد إزاحة المدخلات +/-30 mV (typical); +/-100 mV (max)
تيار تحيز الإدخال +/-0.5 uA (typical, low Iq); +/-5 uA (max, wide BW)
Short-Circuit Current +/-350 mA (typical, low Iq); +/-550 mA (wide BW)
Settling Time (0.1%) 200 ns @ 20V step, RL=100Ohm
Thermal Shutdown 175C (typical)
الحزمة 8-Pin PDIP (P suffix)
درجة حرارة التشغيل -40C to +85C (specification); -40C to +125C (operating)

الميزات

  • 250mA continuous output current
  • 2000V/us slew rate
  • Pin-selectable bandwidth: 30MHz (low Iq) to 180MHz (wide BW)
  • Unity-gain open-loop buffer (can be used inside op-amp feedback)
  • +/-2.25V to +/-18V wide supply range
  • Internal current limit and thermal shutdown
  • 8-Pin PDIP through-hole package

التطبيقات

  • Op-amp output current booster
  • Capacitive load driver
  • Headphone driver
  • Coil/cable driver

The BUF634P from Texas Instruments (originally Burr-Brown) is a 250mA high-speed unity-gain open-loop buffer in an 8-pin PDIP through-hole package. The device is designed to be used inside the feedback loop of an op-amp to increase output current capability, eliminate thermal feedback, and improve capacitive load drive. In the low quiescent current mode (BW pin floating or connected to V- through a resistor), the BUF634 operates on 1.5mA with 30MHz bandwidth and 2000V/us slew rate. In the wide bandwidth mode (BW pin connected directly to V-), the quiescent current increases to 15mA but the bandwidth extends to 180MHz. The 250mA continuous output current and 2000V/us slew rate make the BUF634 ideal for driving heavy loads such as cables, transformers, and headphones while maintaining the precision of the driving op-amp. When placed inside the feedback loop of a precision op-amp, the op-amp’s error correction eliminates the BUF634’s 30mV typical input offset voltage, providing a composite amplifier with the op-amp’s precision and the BUF634’s output drive capability. The internal current limit and thermal shutdown protect the device from fault conditions. The P suffix indicates the 8-pin PDIP through-hole package.

The BUF634P is an open-loop unity-gain buffer with a complementary emitter-follower output stage. Unlike a closed-loop buffer, there is no internal feedback from output to input. The input signal drives the bases of complementary NPN and PNP transistors in a push-pull Class AB configuration. The output voltage follows the input voltage with a gain of approximately 0.99 (at light loads) due to the base-emitter voltage drops in the output stage. When used inside the feedback loop of an op-amp, the op-amp senses the buffer output (through its feedback network) and adjusts its own output to compensate for the buffer’s gain error and offset voltage, resulting in a composite amplifier with unity gain accuracy set by the op-amp. The BW pin controls the bias current of the output stage. When the BW pin is open (or connected to V- through a resistor), the output stage is biased at low current (1.5mA total), providing 30MHz bandwidth with Class AB operation that minimizes crossover distortion. When the BW pin is shorted to V-, the bias current increases to 15mA, widening the bandwidth to 180MHz by increasing the speed of the output stage. The 2000V/us slew rate is achieved by the large available current to charge the parasitic and load capacitances. The internal current limit operates by sensing the output current and reducing the drive to the output transistors when the current exceeds approximately 350mA (low Iq mode) or 550mA (wide BW mode). The thermal shutdown at 175C junction temperature disables the output stage to prevent damage.

دبوس الاسم النوع الوظيفة
1 BW المدخلات Bandwidth select (float=open, tie to V-=wide BW)
2 نورث كارولاينا - No connect
3 VIN المدخلات Signal input
4 V- الطاقة Negative supply
5 نورث كارولاينا - No connect
6 V+ الطاقة Positive supply
7 VO المخرجات Buffer output
8 نورث كارولاينا - No connect
  • Composite amplifier with OPA627 + BUF634 inside feedback loop for precision audio headphone driver at +/-15V, 250mA output
  • Capacitive load driver using BUF634 inside OPA227 feedback loop to drive 0.1uF cable load with 2000V/us slew rate
  • Low-Iq instrumentation driver at 1.5mA quiescent with 30MHz bandwidth for portable test equipment cable driving
الشركة المصنعة رقم الجزء الحزمة الملاحظات
TI BUF634A SOIC-8/TO-220 Upgraded version, 210MHz, 3750V/us
TI BUF634U SOIC-8 SMD version, same function
TI BUF634T TO-220-5 Power package, same die
الأجهزة التناظرية ADA4870 PSOP-20 1A output, higher current
TI OPA549T TO-220-8 8A power op-amp with buffer function
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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.

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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.

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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.

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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.

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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