Image for reference only
LD39050PU33R
DFN-6 (2x2mm)
The LD39050PU33R from ST is a 500mA 3.3V LDO with ultra-low 8uVrms noise, 70dB PSRR, and 100mV dropout in DFN-6 for RF and audio power supplies.
| Package | DFN-6 (2x2mm) |
The LD39050PU33R from ST is a 500mA 3.3V LDO with ultra-low 8uVrms noise, 70dB PSRR, and 100mV dropout in DFN-6 for RF and audio power supplies.
The LD39050PU33R is a 3.3V 500mA ultra-low-noise LDO from ST in DFN-6 (2x2mm). It achieves 8uVrms output noise (10Hz-100kHz) using a filtered voltage reference architecture. The NR (Noise Reduction) pin connects to an external 10nF capacitor that filters the internal bandgap reference noise before it reaches the error amplifier. Since the reference noise is the dominant noise source in an LDO, this filtering dramatically reduces total output noise compared to standard LDOs (which typically have 30-100uVrms). The PSRR is 75dB at 1kHz and 40dB at 100kHz, making it effective for RF and analog supply filtering. Dropout voltage is 200mV at 500mA (3.3V output requires VIN >= 3.5V). The PMOS pass transistor provides ground current of only 40uA (typical), independent of load current. The EN pin (active HIGH, internal pull-down) enables/disables the output. In shutdown mode, quiescent current drops to 0.1uA. The DFN-6 package with exposed pad provides thermal resistance of 55C/W. Applications include RF transceivers, VCO power, PLL supplies, and ADC/DAC reference supplies where noise performance is critical.
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VIN | Input | Input voltage (2.0-5.5V) |
| 2 | VOUT | Output | Regulated 3.3V output (500mA max) |
| 3 | EN | Input | Enable (active high, internal pull-down) |
| 4 | GND | Power | Ground |
| 5 | NR | Analog | Noise reduction capacitor (10nF for low noise) |
| 6 | BYP | Analog | Bypass capacitor for reference (not connected) |
| Manufacturer | Part Number | Package | Notes |
|---|---|---|---|
| STMicroelectronics | LD39050M33R | DFN-6 | Same device, different package option |
| Texas Instruments | TPS73633DBVR | SOT-23-5 | 3.3V 400mA LDO, 20uVrms noise |
| Analog Devices | ADP122AUJZ-3.3-R7 | TSOT-26 | 3.3V 500mA LDO, 2.5uVrms noise |
| Richtek | RT9013-33GB | SOT-23-5 | 3.3V 500mA LDO, low noise |
| Microchip | MCP1824T-3302E/OT | SOT-23-5 | 3.3V 300mA LDO, low noise |
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
Brand:
Package:
Cargo cycle: 3~7 Days
The minimum order is 1
English English 
简体中文
Español
العربية
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.
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
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.
Settlement Currency
US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.
Bank Charges
All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.
Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.
MOQ & Sample Service
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.
Packaging Standard
All electronic components are packed with professional anti-static and shockproof materials. Original factory packaging is available for branded chips and integrated circuits.
Import Duties & Taxes
All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.
Email: info@materialparts.com
Tel / WhatsApp: +86 13760382860
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.
Submit your component procurement and custom packaging needs via the form below. We will provide a detailed quotation and professional solution within 1–8 working hours.
