LM2931AD33 STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
LM2931AD33 is a fixed 3.3 V LDO linear regulator from STMicroelectronics delivering 100 mA output with only 0.25 V nominal dropout and up to 26 V input voltage. Packaged in an 8-pin SOIC for straightforward PCB integration.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- LM2931AD33 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LM2931AD33?
- Fixed 3.3 V output LDO regulator with 100 mA current capacity and 0.25 V nominal dropout voltage for efficient low-voltage regulation
- Wide input voltage range of 6 V to 26 V (up to 40 V absolute maximum) accommodates diverse power supply architectures from automotive to industrial
- Excellent 0.033% maximum line regulation ensures stable 3.3 V output even with fluctuating input voltages in noise-sensitive analog circuits
What is LM2931AD33 used for?
The LM2931AD33 is designed for applications requiring a stable 3.3 V regulated supply from higher unregulated input voltages, such as automotive electronics, industrial control boards, and sensor interface circuits. Its low 0.25 V dropout voltage and wide 6 V to 26 V input range make it compatible with 12 V and 24 V automotive and industrial power rails. The SOIC-8 package and low quiescent current suit battery-backed and always-on embedded systems where power efficiency matters.
What are the specifications of LM2931AD33?
| YTEOL | 0 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 0.6V |
| Dropout Voltage1-Nom | 0.25V |
| Input Voltage Absolute-Max | 40V |
| Input Voltage-Max | 26V |
| Input Voltage-Min | 6V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Line Regulation-Max | 0.033% |
| Load Regulation-Max | 0.033% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 0.1A |
| Output Voltage1-Max | 3.465V |
| Output Voltage1-Min | 3.135V |
| Output Voltage1-Nom | 3.3V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Qualification Status | Not Qualified |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Voltage Tolerance-Max | 5% |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the LM2931AD33 datasheet?
LM2931AD33 Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for LM2931AD33?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
What is the dropout voltage of the LM2931AD33 at full 100 mA load current?
At full 100 mA load current, the LM2931AD33 exhibits a maximum dropout voltage of 0.6 V and a nominal dropout of just 0.25 V. This low dropout characteristic allows it to maintain a regulated 3.3 V output from input supplies as low as approximately 3.55 V to 3.9 V, making it suitable for near-rail supply scenarios in battery-powered embedded systems.
Can the LM2931AD33 be used directly in 12 V or 24 V automotive power supply designs?
Yes. The LM2931AD33 accepts input voltages from 6 V to 26 V continuous (up to 40 V absolute maximum), covering both 12 V and 24 V automotive battery rails. Its robust input voltage tolerance helps protect downstream 3.3 V logic from load-dump transients common in automotive environments, reducing the need for external surge suppression on the regulated rail.
How does the LM2931AD33's line regulation performance benefit precision analog sensor circuits?
With a maximum line regulation of 0.033%, the LM2931AD33 maintains its 3.3 V output within approximately 1 mV across varying input conditions. This tight regulation is critical for precision analog-to-digital converters, reference voltage circuits, and resistive bridge sensors where supply variation directly adds offset error to measurement results in industrial and medical instrumentation.
Which output capacitor types are compatible with the LM2931AD33 for stable closed-loop operation?
The LM2931AD33 is stable with standard electrolytic and ceramic output capacitors of 1 µF or greater at its output pin. For best transient response at 100 mA step loads, a 10 µF electrolytic or tantalum capacitor is recommended, ensuring the feedback loop remains stable across the full -40°C to 125°C operating temperature range specified by STMicroelectronics.
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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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