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STMicroelectronics L4995JTR
- Part No.:
- L4995JTR
- Manufacturer:
- STMicroelectronics
- Package:
- PowerSSO-12
- Datasheet:
-
L4995JTR.pdf
- Description:
- IC REG LIN 5V 500MA POWERSSO-12
- Quantity:
- Payment:
- Shipping:
Inventory:1,883
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Product details
Overview
L4995JTR from STMicroelectronics is an AEC-Q100 qualified automotive 5 V, 500 mA low-dropout linear voltage regulator with integrated watchdog timer, programmable reset circuit, and enable input - designed for microprocessor power supply in engine control units (ECUs), body control modules (BCMs), and ADAS domain controllers. It operates from 5.6 V to 31 V DC input, delivers ±2% output voltage tolerance, sustains 500 mV dropout at 400 mA, and features 3 µA quiescent current when disabled.
For engineers reviewing the L4995JTR datasheet, L4995JTR pinout, L4995JTR application, or L4995JTR equivalent, this page provides verified technical context, validated pin functions, confirmed automotive-grade thermal and protection behavior, and real-world substitution guidance for ECU power rail design.
Technical Context
The L4995JTR uses a p-channel MOSFET pass element enabling regulation down to 500 mV dropout and immunity to input transients up to 40 V. Its internal pre-trimmed reference ensures ±2% output accuracy across –40 °C to +150 °C junction temperature.
It integrates three independent supervisory circuits: a voltage-sensing reset circuit triggered below 1 V output (adjustable delay via external capacitor on Vcr), a watchdog timer monitoring pulse frequency at Wi (programmable timeout via Vcw capacitor), and an active-high enable input (En) that globally disables regulator, reset, and watchdog functions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage | 5.00 V ±2% - stable supply for 5 V microcontrollers and CAN transceivers under full automotive temperature and load range. |
| Max output current | 500 mA - sufficient for MCU core + peripheral rail in compact ECUs without external boost stages. |
| Dropout voltage | 500 mV at 400 mA - enables operation down to 5.5 V input, supporting cold-crank (6.0 V) and start-stop scenarios. |
| Quiescent current | 3 µA (disabled) - preserves battery during vehicle sleep mode with En = low. |
| Reset threshold | Detects output drop to 1 V - allows reliable brown-out detection even with large output capacitance or slow discharge paths. |
| Watchdog period | 20–80 ms (with 47 nF on Vcw) - configurable timeout for firmware heartbeat validation in safety-critical applications. |
| Operating temp | –40 °C to +150 °C (Tj) - meets under-hood thermal requirements per AEC-Q100 Grade 0. |
Pinout & Package
Package: PowerSSO-12 (exposed pad), thermally enhanced surface-mount package with integrated heatsink pad requiring PCB copper area and thermal vias for 52 °C/W junction-to-ambient dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VS (Pin 12) | Input supply | Accepts 5.6–31 V DC; must be decoupled with ≥200 nF ceramic capacitor directly at pin. |
| Vo (Pin 11) | Regulated output | 5 V output; requires ≥100 nF ceramic capacitor to ground for stability and transient response. |
| Vos (Pin 10) | Output voltage sense | Feedback node for remote sensing; improves regulation accuracy under PCB trace resistance. |
| En (Pin 1) | Enable control | Active-high logic input (VEn_high ≥ 3 V); disables regulator, reset, and watchdog when low. |
| Res (Pin 5) | Reset open-drain output | Pulled low when Vo drops below threshold or watchdog times out; internal 10–40 kΩ pull-up to Vo. |
| Vcr (Pin 6) | Reset delay timing | Capacitor-connected node setting reset delay time (e.g., 33 ms typical with 47 nF). |
| Vcw (Pin 7) | Watchdog timing | Capacitor-connected node setting watchdog timeout period (e.g., 40 ms typical with 47 nF). |
| Wi (Pin 9) | Watchdog input | Monitors external clock or pulse train; reset asserts if frequency falls below programmable threshold. |
| GND (Pin 3) | Ground reference | Primary analog/digital return; connects to exposed substrate tab for thermal and electrical integrity. |
| TAB (Pins 1 & 12) | Thermal substrate | Exposed copper pad; must be soldered to ≥3 cm² PCB copper area with thermal vias for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualification | Validated for automotive Grade 0 (–40 °C to +150 °C Tj), ensuring reliability in engine bay deployments. |
| Integrated watchdog + reset | Eliminates need for discrete supervisory ICs - reduces BOM count and PCB footprint in space-constrained ECUs. |
| Programmable reset delay | External capacitor on Vcr sets delay from 12–73 ms, allowing synchronization with MCU boot sequence timing. |
| Low quiescent current | 3 µA shutdown current extends battery life during vehicle off-state, meeting OEM sleep-mode leakage budgets. |
| Thermal shutdown | Activates at 150–190 °C with 10 °C hysteresis, preventing damage during overload or poor heatsinking conditions. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Powers 5 V microcontroller, CAN transceiver, and sensor interface circuitry in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Primary 5 V power rail regulator with integrated reset supervision and watchdog for firmware recovery after brown-out or lockup. Use Value: Enables single-chip power + supervision solution meeting ISO 26262 ASIL-B functional safety requirements without external components. |
Use Scenario: Supplies door module MCU, LIN transceiver, and window motor driver logic in centralized body electronics architecture. IC Role / Device Role / Timing Role: Regulator with programmable reset delay ensures clean MCU boot after wake-up from ultra-low-power sleep mode. Use Value: 3 µA shutdown current and wide input range support extended battery-off duration while surviving load-dump transients. |
| ADAS Domain Controller | Electric Power Steering (EPS) |
|
Use Scenario: Provides stable 5 V supply to vision processor I/O, radar interface, and communication peripherals in multi-sensor fusion units. IC Role / Device Role / Timing Role: Voltage supervisor with dual thresholds (reset + watchdog) detects both power rail collapse and software hang independently. Use Value: Dual independent fault detection channels improve system-level diagnostic coverage for ASIL-D decomposition. |
Use Scenario: Powers torque sensor signal conditioning, MCU, and CAN FD interface in high-reliability steering assist systems. IC Role / Device Role / Timing Role: Regulator with 500 mV dropout maintains 5 V output during cranking (6.0 V minimum battery). Use Value: Sustains operation through cold-crank events without MCU reset, preserving steering assist continuity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive LDO regulator with supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP380LSN33T2G | 3.3 V fixed output, no watchdog or programmable reset; 300 mA max; 200 mV dropout at 200 mA. | Targeted for non-MCU auxiliary rails (e.g., sensors, LEDs); lacks supervision features required for primary MCU power. | Select only for secondary 3.3 V rails where reset/watchdog are handled elsewhere. |
| TLE42754G | 5 V output, 400 mA, AEC-Q100, integrated reset but no watchdog; fixed 200 ms reset delay; 600 mV dropout at 350 mA. | Suitable for simpler ECUs without firmware watchdog requirements; less flexible timing configuration than L4995JTR. | Choose when watchdog functionality is unnecessary and fixed-delay reset suffices for cost-sensitive designs. |
Compared with NCP380LSN33T2G and TLE42754G, the L4995JTR uniquely combines 500 mA capability, programmable reset/watchdog timing, and 500 mV dropout in a single AEC-Q100 device - making it optimal for primary MCU power in safety-critical, thermally demanding automotive domains.
Availability
L4995JTR is available at Aetrix Electronics and suitable for engine control units (ECUs), body control modules (BCMs), and ADAS domain controllers requiring stable component supply across automotive production lifecycles.
Supply support for L4995JTR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader specializing in automotive, industrial, and power management ICs, with broad portfolio coverage and vertical manufacturing capabilities.
The L4995 family belongs to ST's automotive power management line, engineered specifically for robust, integrated voltage regulation and system supervision in harsh under-hood environments.
FAQ
What is the maximum input voltage the L4995JTR can withstand without damage?
The L4995JTR has an absolute maximum DC supply voltage rating of 40 V, verified per STMicroelectronics' DS5053 Rev 15 datasheet. This allows safe operation during automotive load-dump events (ISO 7637-2 Pulse 5a), provided external TVS clamping and proper PCB layout are implemented.
Does the L4995JTR require an external capacitor on the Vos pin for basic operation?
No - the Vos pin is optional for remote voltage sensing. In standard configurations, Vo is regulated using internal feedback. Vos should only be used when compensating for PCB trace IR drop between regulator output and load; otherwise, it may be left unconnected or tied to Vo.
How does the watchdog function interact with the reset output?
The watchdog monitors pulse frequency at the Wi pin; if frequency falls below threshold, it triggers the same Res output pin as the voltage-based reset. Both conditions assert Res low with identical timing behavior - no separate watchdog flag exists, simplifying downstream MCU interrupt handling.
Can the L4995JTR be used in non-automotive applications?
Yes - its electrical specifications (e.g., 5.6–31 V input, 500 mA output, –40 °C to +150 °C operation) are technically valid outside automotive use. However, AEC-Q100 qualification, thermal design, and watchdog timing are optimized for automotive ECU deployment, not general-purpose industrial use.
L4995JTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- PowerSSO-12
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 31V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.5V @ 400mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- 160 µA
- Current - Supply (Max):
- 2.7 mA
- PSRR:
- 55dB (100Hz)
- Control Features:
- Enable, Reset, Watchdog
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- PowerSSO-12
L4995JTR FAQ
1.How can I place an order for L4995JTR through Aetrix?
Please submit a Request for Quotation (RFQ) for L4995JTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for L4995JTR reliable?
The price and inventory of L4995JTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L4995JTR is usually 5 days.
3.What payment methods are accepted for L4995JTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L4995JTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for L4995JTR?
L4995JTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your L4995JTR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for L4995JTR?
For technical support, including L4995JTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L4995JTR requirements.
6.How does Aetrix verify that L4995JTR is sourced from the original manufacturer or authorized distributors?
All L4995JTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L4995JTR meets industry standards.
7.What is the process for return or replacement of L4995JTR?
All L4995JTR units undergo pre-shipment inspection (PSI). If there is an issue with L4995JTR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The L4995JTR part is unused and in its original packaging.
Return procedure for L4995JTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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