L4949ED-E STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
The L4949ED-E is an automotive-grade multifunction very low dropout voltage regulator from STMicroelectronics, delivering a fixed 5V output at up to 100mA with only 0.3V typical dropout. Housed in SOIC-8 package with AEC-Q100 qualification, it supports input voltages from 6V to 28V and includes built-in watchdog, reset, and inhibit functions. Available from authorized distributors with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- L4949ED-E Datasheet PDF
- Category
- Integrated Circuit
- Price
- From $0.4019(MOQ 535)
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of L4949ED-E?
- Fixed 5V output with ultra-low 0.3V typical dropout voltage for automotive supply rail efficiency
- AEC-Q100 qualified for automotive reliability across -40°C to +125°C temperature range
- Integrated watchdog timer and reset functions reduce external component count in automotive ECUs
- Wide 6V to 28V input voltage range covers automotive battery and load-dump conditions
- SOIC-8 package enables compact PCB layout in space-constrained automotive modules
What is L4949ED-E used for?
The L4949ED-E is ideal for automotive body electronics, dashboard controllers, and engine control units requiring a stable 5V rail from the vehicle battery. Its integrated watchdog and reset functions make it well suited for microcontroller supply circuits in airbag, ABS, and powertrain modules. The device also fits industrial applications where a robust, low-dropout 5V regulator with supervisory features is needed.
What are the specifications of L4949ED-E?
| YTEOL | 0 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 0.5V |
| Dropout Voltage1-Nom | 0.3V |
| Input Voltage Absolute-Max | 28V |
| Input Voltage-Max | 28V |
| Input Voltage-Min | 6V |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e3 |
| Line Regulation-Max | 0.02% |
| Load Regulation-Max | 0.03% |
| 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 | 5.25V |
| Output Voltage1-Min | 4.75V |
| Output Voltage1-Nom | 5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Packing Method | TUBE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Terminal Finish | Matte Tin (Sn) - annealed |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Voltage Tolerance-Max | 2% |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 3 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the L4949ED-E datasheet?
L4949ED-E Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for L4949ED-E?
Compatible alternatives and drop-in replacements for L4949ED-E:
Frequently Asked Questions
What is the minimum input voltage the L4949ED-E can accept while maintaining its 5V regulated output?
The L4949ED-E requires a minimum input voltage of 6V to maintain regulation at its fixed 5V output. With a typical dropout voltage of only 0.3V, the device can regulate effectively even when the supply drops close to 6V, making it suitable for automotive systems where battery voltage may dip during cold-crank events.
How much output current can the L4949ED-E supply, and is it sufficient for microcontroller-based automotive ECUs?
The L4949ED-E provides up to 100mA of continuous output current at 5V. This is sufficient to power low-power 8-bit or 32-bit microcontrollers, logic peripherals, and sensor interfaces in automotive ECUs, especially when heavier loads such as actuator drivers are powered separately from the main battery rail.
Which automotive temperature grade does the L4949ED-E meet, and what junction temperature range is supported?
The L4949ED-E is AEC-Q100 qualified for automotive applications and operates over a junction temperature range of -40°C to +125°C. This makes it reliable across the full under-hood thermal environment encountered in engine management, transmission control, and body control module designs.
Does the L4949ED-E include a watchdog timer, and how does that benefit automotive system designers?
Yes, the L4949ED-E integrates a watchdog timer and a reset output function directly on-chip. This eliminates the need for a separate supervisory IC, saving at least 1 component position on the PCB and reducing BOM cost. The watchdog monitors the microcontroller and asserts a reset signal if the processor stalls, improving system fault tolerance in safety-relevant automotive applications.
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Why Buy from FindMyChip
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.
| Qty. | Unit Price | Ext. Price |
|---|---|---|
| 535+ | $0.4354 | $232.94 |
| 690+ | $0.4193 | $289.32 |
| 865+ | $0.4019 | $347.64 |
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