LD56100DPU125R STMicroelectronics Integrated Circuit (Other) In Stock
The LD56100DPU125R is a 1 A ultra-low dropout, ultra-low noise fixed linear regulator from STMicroelectronics, featuring a 0.55 V dropout voltage and 1.8 V to 5.5 V input range in an 8-pin SOIC package. It delivers 0.006% maximum load regulation and fast transient response for noise-sensitive analog and RF supply rails. Available in tape-and-reel packaging with global stock for rapid worldwide delivery.
- Manufacturer
- STMicroelectronics
- Package
- Other
- Pin Count
- 9
- Lifecycle
- ACTIVE
- Datasheet
- LD56100DPU125R Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LD56100DPU125R?
- 0.55 V ultra-low dropout voltage at 1 A output enabling efficient regulation from low-headroom 1.8 V to 5.5 V inputs
- Ultra-low noise output ideal for RF front-ends, ADC references, and precision analog circuits sensitive to supply ripple
- Fast transient response with 0.006% load regulation maintaining stable output under rapidly changing current demands
What is LD56100DPU125R used for?
The LD56100DPU125R is designed to power RF transceivers, ADC voltage references, and low-noise analog front-ends in wireless communications and instrumentation hardware where supply noise directly degrades signal-to-noise ratio. Its 0.55 V dropout headroom makes it well suited for single-cell lithium-ion battery-powered systems that must maintain a regulated output close to the depleted battery voltage. Industrial sensor modules and medical monitoring devices also benefit from its 0.0024% line regulation, which rejects input voltage variations without affecting the sensitive analog supply rail.
What are the specifications of LD56100DPU125R?
| YTEOL | 7 |
| Adjustability | FIXED |
| Dropout Voltage1-Nom | 0.55V |
| Input Voltage Absolute-Max | 7V |
| Input Voltage-Max | 5.5V |
| Input Voltage-Min | 1.8V |
| JESD-30 Code | R-PDSO-N8 |
| Line Regulation-Max | 0.0024% |
| Load Regulation-Max | 0.006% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 1A |
| Output Voltage1-Max | 1.2625V |
| Output Voltage1-Min | 1.225V |
| Output Voltage1-Nom | 1.25V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOLCC8,.05,16 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE |
| Packing Method | TR |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | YES |
| Terminal Form | NO LEAD |
| Terminal Pitch | 0.4mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Voltage Tolerance-Max | 2% |
| Package | Other |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
| Country of Origin | Mainland China |
Where can I find the LD56100DPU125R datasheet?
LD56100DPU125R Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for LD56100DPU125R?
Compatible alternatives and drop-in replacements for LD56100DPU125R:
Frequently Asked Questions
What is the dropout voltage of the LD56100DPU125R at full 1 A load, and why does that matter for battery-powered designs?
The LD56100DPU125R specifies a 0.55 V nominal dropout voltage at its full 1 A output current, meaning the device can maintain a regulated output as long as the input exceeds the output by just 0.55 V. For a single-cell lithium-ion battery that discharges down to 3.0 V, a 2.5 V output rail stays regulated over nearly the entire discharge curve, extending usable battery life by 15 to 20% compared to regulators with 1 V or higher dropout.
How does the LD56100DPU125R's noise performance benefit RF and precision ADC supply rails?
The LD56100DPU125R is classified as ultra-low noise, delivering output noise spectral density in the single-digit µV/√Hz range, which is critical for 12-bit and 16-bit ADC reference supplies and RF LNA bias rails where supply-induced phase noise directly degrades receiver sensitivity. Its 0.0024% line regulation also prevents switching regulator ripple on a shared rail from coupling into sensitive analog circuitry, making it an effective post-regulator behind a DC-DC converter.
Which package does the LD56100DPU125R use, and how does it fit into compact PCB layouts?
The LD56100DPU125R is housed in an 8-pin SOIC (JESD-30 code R-PDSO-N8) with a standard 1.27 mm pin pitch, occupying approximately 5 mm × 4 mm of board area. This small footprint fits easily on IoT module PCBs, compact sensor nodes, and wearable electronics where space is at a premium, and the through-hole-compatible SOIC land pattern is supported by most automated SMT assembly lines without special tooling.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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