on November 5th 69

How the LM385 Voltage Regulator Diode Works and Where to Use It

Discover how the LM385 voltage regulator diode works and why it’s a reliable choice for low-power applications. This guide covers its features, uses, and what makes it a versatile component for various electronic projects.

Catalog

Overview of LM385 Voltage Regulator Diode

The LM385 series includes micropower, two-terminal bandgap voltage regulator diodes designed for a current range of 10 μA to 20 mA. They are known for their low dynamic impedance and minimal noise, making them stable across temperature shifts and over time. On-chip trimming enhances their voltage accuracy, providing consistency in various circuit designs. With a wide operating range, these diodes are flexible, allowing use in circuits where power supply levels may vary, yet requiring steady regulation.

Their low current requirement makes the LM385 series ideal for portable instrumentation, regulators, and analog devices where battery life is a priority. Available in TO-226 plastic or surface-mount packages with voltage options of 1.235 V and 2.500 V, they meet diverse application needs.

LM385 Pin Configuration

LM385 CAD Model

LM385 Footprint

LM385 3D Model

Key Features of LM385

Wide Operating Current Range

The LM385 can operate across a broad current range, from 10 μA to 20 mA. This flexibility means you can use it in applications that vary widely in power requirements, especially those where conserving power is a priority. The ability to handle such a range makes the LM385 versatile for different electronic designs.

Multiple Voltage Tolerance Options

The LM385 is available in several tolerance grades, including 1.0%, 1.5%, 2.0%, and 3.0%. This variety allows you to select the level of accuracy that best suits your project, whether you need very tight voltage control or can work with slightly more flexibility. This customization makes it adaptable to applications where precision is a factor.

Stability in Temperature Variations

A low temperature coefficient means the LM385 remains stable across changes in temperature, reducing the likelihood of performance shifts in different environments. For projects where temperature changes are expected, this feature ensures that the LM385 delivers consistent results, making it reliable in various conditions.

Low Dynamic Impedance

With a dynamic impedance of just 1.0 Ω, the LM385 minimizes voltage fluctuation, even under varying load conditions. This feature helps provide a smooth, steady output, which is especially valuable in circuits where stable voltage is critical for proper function.

Surface-Mount Packaging Option

The LM385 series includes a surface-mount option, ideal for applications that need a compact, space-efficient design. Surface-mount components like the LM385 are often preferred in modern electronics due to their small footprint, making them suitable for high-density circuit boards.

RoHS Compliant and Lead-Free

The LM385 meets RoHS compliance standards and is lead-free, which aligns with modern environmental and safety requirements. This feature makes the LM385 a good choice for projects that prioritize eco-friendly components or need to meet specific regulatory standards.

LM385 Specifications

Technical specifications, features, characteristics, and components with comparable specifications of ON Semiconductor LM385Z-1.2G

Type	Parameter
Lifecycle Status	ACTIVE (Last Updated: 23 hours ago)
Factory Lead Time	13 Weeks
Mount	Through Hole
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA)
Number of Pins	3
Weight	4.535924g
Operating Temperature	0°C~70°C TA
Packaging	Bulk
Tolerance	-2.4% +2.01%
JESD-609 Code	e3
Pbfree Code	yes
Part Status	Active
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Number of Terminations	3
ECCN Code	EAR99
Temperature Coefficient	80ppm/°C Typical
Terminal Finish	Tin (Sn)
Terminal Position	BOTTOM
Peak Reflow Temperature	260°C
Number of Functions	1
Terminal Pitch	1.27mm
Current Rating	20mA
Time@Peak Reflow Temperature	40s
Base Part Number	LM385
Pin Count	3
Number of Outputs	1
Output Voltage	1.235V
Output Type	Fixed
Max Output Current	20mA
Trim/Adjustable Output	NO
Analog IC - Other Type	TWO TERMINAL VOLTAGE REFERENCE
Max Output Voltage	1.235V
Halogen Free	Halogen Free
Reference Voltage	1.235V
Reference Type	Shunt
Min Output Voltage	1.235V
Current - Cathode	20μA
Noise - 10Hz to 10kHz	60μVrms
Height	5.33mm
Length	5.2mm
Width	4.19mm
REACH SVHC	No SVHC
Radiation Hardening	No
RoHS Status	ROHS3 Compliant
Lead Free	Lead Free

Parts with Similar Specifications to LM385

The parts on the right have specifications similar to the ON Semiconductor LM385Z-1.2G

Part Number	Manufacturer	Package / Case	Number of Pins	Max Output Current	Min Output Voltage	Output Voltage	Max Output Voltage	Tolerance	Temperature Coefficient
LM385Z-1.2G	ON Semiconductor	TO-226-3, TO-92-3	3	20 mA	1.235 V	1.235 V	1.235 V	-2.4%, +2.01%	80ppm/°C Typical
LM285Z-1.2G	ON Semiconductor	TO-226-3, TO-92-3	3	20 mA	1.235 V	1.235 V	1.235 V	±1%	80ppm/°C Typical
LM285LP-1-2	Texas Instruments	TO-226-3, TO-92-3	3	20 mA	1.235 V	1.235 V	1.235 V	±1%	80ppm/°C Typical
LM385BZ-1.2G	ON Semiconductor	TO-226-3, TO-92-3	3	20 mA	1.24 V	5.3 V	5.3 V	±2%	150ppm/°C
LM385Z-NOPB	Texas Instruments	TO-226-3, TO-92-3	3	20 mA	1.223 V	1.235 V	1.235 V	±1%	20ppm/°C Typical

Equivalents of LM385

Model Number	Manufacturer	Description
LM385LPRE3-1-2	Texas Instruments	1.235-V, 2%, 0°C to 70°C, micropower voltage reference 3-TO-92 0 to 70
LM385Z-1.2RA	Motorola Semiconductor Products	Two Terminal Voltage Reference, 1 Output, 1.235V, BIPolar, PBCY3, PLASTIC, TO-226AA, 3 PIN
LM385BYZ-1.2	Texas Instruments	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.235V, PBCY3, PLASTIC, TO-92, 3 PIN
LM285BXM-1.2X	Texas Instruments	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.235V, PDSO8, SO-8
LM385Z-1.2	Motorola Mobility LLC	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.235V, PBCY3, PLASTIC, TO-226AA, 3 PIN
LM385LP-1.2	Linfinity Microelectronics	Two Terminal Voltage Reference, 1.2V, BIPolar, PBCY3, PLASTIC, TO-226AA, 3 PIN
LM385BZ-1.2RA	On Semiconductor	MicroPower Voltage Reference Diodes 1.2 V, ±1%, TO-92 (TO-226) 5.3mm Body Height, 2000-REEL
LM385CZB-1.2	Telcom Semiconductor Inc	Two Terminal Voltage Reference, 1 Output, 1.235V, BIPolar, PBCY3
LM385BXZ-1.2X	Texas Instruments	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.235V, PBCY3, PLASTIC, TO-92, 3 PIN

Functional Block Diagram of LM385

Applications for LM385

Portable Instrumentation

The LM385 is especially effective in portable instrumentation due to its low power consumption, helping to extend battery life in devices that need to be energy-efficient. Its ability to operate on minimal power makes it well-suited for tools and instruments that are used on the go, ensuring prolonged performance without frequent recharging or battery replacements.

Voltage Regulation

In circuits that require stable and precise voltage regulation, the LM385 serves as a reliable option. It can maintain a steady output voltage, which is essential for applications where voltage fluctuations could disrupt functionality. This makes the LM385 a valuable component in regulatory systems that demand consistent power delivery.

Analog Circuits

The LM385 performs well in analog circuits, where low noise and stable output are needed for accurate signal processing. Its consistent voltage reference aids in maintaining signal integrity, helping to achieve smooth circuit operation. This reliability makes it a preferred choice in analog applications, where even minor fluctuations in voltage can impact performance.

LM385 Package Information

About the Manufacturer of LM385

On Semiconductor, listed as ON on Nasdaq, is dedicated to reducing energy use. The company provides an extensive range of products in power, signal management, and custom solutions, all designed to be energy-efficient. It maintains a reliable supply chain with a strong network of manufacturing facilities, sales offices, and design centers in North America, Europe, and the Asia Pacific regions. This global reach allows them to offer reliable and responsive support to various markets, ensuring consistent access to high-quality products like the LM385.

Datasheet PDF

LM285Z-1.2G Datasheet:

LM285Z-1.2G.pdf

LM285Z-1.2G.pdf

LM385BZ-1.2G Datasheet:

LM385BZ-1.2G.pdf

LM385BZ-1.2G.pdf