L4993MD STMicroelectronics Integrated Circuit (Small Outline Packages) In Stock
The L4993MD is an automotive-grade low-dropout voltage regulator with integrated watchdog from STMicroelectronics. It accepts inputs from 6 V to 31 V with a nominal 200 mV dropout and a maximum 40 V absolute rating, meeting automotive transient requirements. Packaged in 20-pin SO, it targets ECU power supply and microcontroller reset supervision.
- Manufacturer
- STMicroelectronics
- Package
- Small Outline Packages
- Pin Count
- 20
- Lifecycle
- NOT RECOMMENDED
- Datasheet
- L4993MD Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of L4993MD?
- Integrated watchdog timer for microcontroller supervision in automotive ECUs
- Low 200 mV nominal dropout voltage at rated load for efficient 12 V battery operation
- Wide input range of 6 V to 31 V with 40 V absolute maximum for automotive transient tolerance
- Fixed output voltage with excellent 0.025% line regulation for stable MCU supply
- AEC-Q100 qualified for automotive temperature and reliability requirements
What is L4993MD used for?
The L4993MD is designed for automotive electronic control units requiring a regulated low-voltage rail and hardware watchdog supervision from a 12 V or 24 V vehicle battery. It powers body control modules, instrument clusters, and ADAS sub-processors where supply voltage fluctuations from load dumps must be survived up to 40 V. The integrated watchdog eliminates a discrete supervisor IC, reducing component count and improving system reliability in harsh under-hood environments.
What are the specifications of L4993MD?
| YTEOL | 3 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 0.4V |
| Dropout Voltage1-Nom | 0.2V |
| Input Voltage Absolute-Max | 40V |
| Input Voltage-Max | 31V |
| Input Voltage-Min | 6V |
| JESD-30 Code | R-PDSO-G20 |
| JESD-609 Code | e3 |
| Line Regulation-Max | 0.025% |
| Load Regulation-Max | 0.025% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 150°C |
| Operating Temperature TJ-Min | -40 °C |
| Output Current1-Max | 0.15A |
| Output Voltage1-Max | 5.1V |
| Output Voltage1-Min | 4.9V |
| Output Voltage1-Nom | 5V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP20,.4 |
| 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 | BICMOS |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| 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 |
| Country of Origin | Malaysia |
Where can I find the L4993MD datasheet?
L4993MD Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for L4993MD?
Compatible alternatives and drop-in replacements for L4993MD:
Frequently Asked Questions
How does the L4993MD handle automotive load dump transients that can spike the battery rail above 24 V?
The L4993MD tolerates an absolute maximum input voltage of 40 V, well above the ISO 7637 load dump levels typically seen on 12 V vehicle batteries. Its input protection circuitry clamps and survives these transients without damage, ensuring the regulated output and watchdog remain operational after the transient subsides.
What watchdog timeout behavior does the L4993MD provide, and how does it reset an automotive microcontroller under fault conditions?
The L4993MD integrates a hardware watchdog timer that generates a reset pulse when the connected microcontroller fails to toggle the watchdog input within the programmed window period, typically on the order of tens of milliseconds. This ensures the MCU is restarted within a defined interval in case of software hang, which is a mandatory safety feature in automotive body and chassis ECU designs.
Can the L4993MD supply a 5 V microcontroller rail directly from a 12 V automotive battery without an additional pre-regulator?
Yes, with a 12 V nominal battery input well above the 6 V minimum, the L4993MD regulates directly down to its fixed 5 V output with only 200 mV nominal dropout. The 20-pin SO package provides sufficient thermal dissipation for typical MCU loads, and the 31 V maximum input covers fully charged and transient battery conditions without requiring an upstream pre-regulator.
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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.
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