L4949DR2G Linear Voltage Regulator - Equivalent & Substitute Parts

Part Overview

The L4949DR2G is a linear voltage regulator IC manufactured by onsemi, designed to deliver a fixed 5V output at 100mA with integrated reset and protection features. This device is classified as obsolete, making identification of active equivalent parts essential for new designs and production continuity. The L4949DR2G operates across an input voltage range up to 28V with a maximum dropout voltage of 0.5V at full load current, suitable for low-power regulated supply applications in industrial and consumer electronics.

Substiute Parts

L4949DR2G

onsemiIn Stock: 15987L4949DR2G Datasheet

Current PartRFQ

L4949EDTR-E

STMicroelectronicsIn Stock: 17635L4949EDTR-E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the L4949DR2G is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 5V
• Output current capability of 100mA minimum
• Maximum input voltage rating of 28V or greater
• Dropout voltage specification of 0.5V @ 100mA or lower
• Identical package format: 8-SOIC (0.154", 3.90mm Width)
• Presence of reset control feature
• Over temperature and short circuit protection
• Operating temperature range of -40°C to 125°C or wider

The L4949EDTR-E from STMicroelectronics meets all parametric requirements for direct substitution. Both devices share the same base product number (L4949) and are functionally equivalent across all specified electrical and mechanical parameters.

Parameter Comparison

Engineering Selection Recommendations

The L4949EDTR-E is the direct parametric equivalent for the obsolete L4949DR2G. Selection of the STMicroelectronics variant provides the following advantages:

• Active product status ensures long-term availability and supply chain continuity
• Automotive-grade qualification (AEC-Q100) provides enhanced reliability documentation
• RoHS3 compliance meets current environmental and regulatory requirements
• Identical electrical specifications and package footprint enable direct PCB substitution without layout modifications
• Quiescent current specification of 300 µA represents a minor increase from 260 µA, remaining within acceptable operating margins for typical 5V regulator applications

Both devices are classified as REACH Unaffected and carry EAR99 export classification. The L4949EDTR-E is available in Cut Tape and Digi-Reel packaging formats, supporting both prototype and production volume requirements.

Frequently Asked Questions (FAQ)

Q: Can the L4949EDTR-E be used as a direct replacement for the L4949DR2G on existing PCBs?

A: Yes. Both devices use identical 8-SOIC package geometry (0.154", 3.90mm width) and share the same pinout. No PCB layout modifications are required for substitution.

Q: What is the difference in quiescent current between these parts?

A: The L4949DR2G specifies 260 µA quiescent current, while the L4949EDTR-E specifies 300 µA. This 40 µA difference is negligible in applications where the regulator supplies 100mA output current and does not affect circuit functionality.

Q: Why is the L4949DR2G listed as obsolete?

A: Obsolescence indicates the part is no longer in active production by onsemi. The L4949EDTR-E from STMicroelectronics provides functional continuity for designs requiring this regulator topology.

Q: Are there any compliance differences between the two parts?

A: The L4949EDTR-E includes AEC-Q100 automotive qualification and RoHS3 compliance certification. The L4949DR2G does not list these qualifications. Both are REACH Unaffected.

Q: What packaging options are available for the L4949EDTR-E?

A: The L4949EDTR-E is supplied in Cut Tape (CT) and Digi-Reel packaging formats, supporting both prototype development and high-volume production environments.

Q: Can these regulators be used in automotive applications?

A: The L4949EDTR-E carries AEC-Q100 automotive qualification. The L4949DR2G does not list automotive qualification. For automotive designs, the L4949EDTR-E is the appropriate selection.