L4949DR2 Equivalent & Substitute Parts

Part Overview

The L4949DR2 is a linear voltage regulator IC from onsemi designed for positive fixed output applications. This 8-SOIC surface mount device delivers 100mA output current with a fixed 5V output and 0.5V maximum dropout voltage at rated load. The regulator includes integrated over-temperature and short-circuit protection with reset control features.

The L4949DR2 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this component.

Substiute Parts

L4949DR2

onsemiIn Stock: 2721L4949DR2 Datasheet

Current PartRFQ

L4949EDTR-E

STMicroelectronicsIn Stock: 17635L4949EDTR-E Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the L4949DR2 are identified based on strict electrical and mechanical parameter matching. The following criteria determine substitution eligibility:

Critical Matching Parameters:

• Output configuration (Positive)
• Output type (Fixed)
• Fixed output voltage (5V)
• Maximum input voltage (28V)
• Output current rating (100mA)
• Maximum dropout voltage (0.5V @ 100mA)
• Operating temperature range (-40°C ~ 125°C)
• Package type (8-SOIC)
• Protection features (Over Temperature, Short Circuit)
• Control features (Reset)

The L4949EDTR-E from STMicroelectronics meets all critical electrical specifications and mechanical requirements, making it a parametric equivalent for the obsolete L4949DR2.

Parameter Comparison

Engineering Selection Recommendations

The L4949EDTR-E is an active product with full RoHS3 compliance, addressing the obsolescence status of the L4949DR2. Both devices share identical electrical specifications for output voltage, input voltage range, output current, and dropout voltage characteristics. The package footprint and mounting type are identical, enabling direct PCB-level substitution without layout modifications.

The L4949EDTR-E carries AEC-Q100 automotive qualification, providing additional reliability assurance for applications requiring automotive-grade components. The quiescent current specification of the L4949EDTR-E (300 µA) is marginally higher than the L4949DR2 (260 µA), remaining within acceptable operational parameters for most applications.

Frequently Asked Questions (FAQ)

Q: Can the L4949EDTR-E directly replace the L4949DR2 on existing PCBs?

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

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

A: The L4949DR2 specifies 260 µA quiescent current, while the L4949EDTR-E specifies 300 µA. This 40 µA difference is negligible in most applications and does not affect functional compatibility.

Q: Is the L4949EDTR-E suitable for automotive applications?

A: The L4949EDTR-E carries AEC-Q100 automotive qualification. The L4949DR2 does not specify automotive qualification. Verify application requirements before substitution in automotive systems.

Q: What is the significance of RoHS3 compliance on the L4949EDTR-E?

A: RoHS3 compliance indicates the L4949EDTR-E meets current environmental and hazardous substance restrictions. The L4949DR2 is RoHS non-compliant. For applications subject to RoHS regulations, the L4949EDTR-E is the appropriate choice.

Q: Are the electrical specifications identical between these parts?

A: Yes. Output voltage (5V fixed), input voltage range (28V max), output current (100mA), dropout voltage (0.5V @ 100mA), operating temperature range (-40°C ~ 125°C), and protection features are identical across both devices.

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 manual and automated assembly processes.