STMicroelectronics L4995RJTR

Overview

L4995RJTR from STMicroelectronics is an AEC-Q100 qualified automotive 5 V, 500 mA low-dropout linear voltage regulator with integrated programmable reset circuit, thermal shutdown, short-circuit protection, and wide operating temperature range (−40 °C to +150 °C). It features 500 mV max dropout at 400 mA, ±2% output voltage tolerance, and 3 µA quiescent current when disabled - designed for microprocessor power supply in engine control units and body electronics.

For engineers reviewing the L4995RJTR datasheet, L4995RJTR pinout, L4995RJTR application, or L4995RJTR equivalent, key selection criteria include its PowerSSO-12 exposed-pad package, externally programmable reset delay via capacitor on Vcr, absence of watchdog/enable inputs (L4995R variant), and DC input voltage support up to 31 V with transient tolerance to 40 V.

Technical Context

The L4995R implements a p-channel MOSFET pass element enabling regulation down to 500 mV dropout while maintaining stability across input transients up to 40 V. Its precision output is derived from a pre-trimmed reference, achieving ±2% tolerance over −40 °C to +150 °C junction temperature.

Reset functionality is triggered when output voltage falls below 6–10% of nominal (Vo_th), with delay programmable via external capacitor on Vcr (12–73 ms typical with 47 nF). The device lacks watchdog and enable pins - distinguishing it from L4995 and L4995A variants - and relies solely on VS and GND for basic operation.

Key Specifications

Pinout & Package

Supplied in PowerSSO-12 package with exposed thermal pad (pin 1 and 12 connected to substrate/GND). Pin count and function mapping are specific to the L4995R variant: no En or Wi pins; Vcr and Res pins dedicated to reset timing and output.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 5 V automotive LDO regulator applications.

Compared with TLE4275G and NCV8664STT33T3G, the L4995RJTR uniquely combines 5 V/500 mA regulation, AEC-Q100 Grade 0 qualification, and capacitor-programmable reset timing in a thermally enhanced PowerSSO-12 package - making it optimal for space-constrained, safety-critical 5 V microprocessor supplies where timing flexibility and thermal robustness are essential.

Availability

L4995RJTR is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and ADAS camera ECUs requiring stable component supply across automotive production lifecycles.

Supply support for L4995RJTR 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 from microcontrollers to analog and power devices.

The L4995 family targets automotive power management, specifically delivering robust, integrated 5 V LDO solutions with supervision features for microprocessor-based electronic control units in harsh under-hood environments.

FAQ

What is the maximum input voltage the L4995RJTR can withstand without damage?

The L4995RJTR has an absolute maximum DC supply voltage rating of 40 V, allowing it to survive automotive load-dump transients. Continuous operation is specified from 5.6 V to 31 V; operation above 31 V is limited to transient events ≤40 V and must remain within energy limits defined by thermal design.

Does the L4995RJTR require an external capacitor on the Vcr pin for basic operation?

No - the Vcr pin is optional. If reset supervision is not required, Vcr may be left floating. When used, a capacitor between Vcr and GND sets the reset delay time (e.g., 47 nF yields 12–73 ms); no resistor is needed as internal charge/discharge currents are fixed.

Can the L4995RJTR be used in non-automotive applications?

Yes - its electrical specifications (−40 °C to +150 °C operation, 5.6–31 V input, 500 mV dropout) are technically suitable for industrial or transportation applications. However, AEC-Q100 qualification is not required outside automotive use, and alternative non-automotive LDOs may offer better cost or feature fit.

How is thermal performance affected by PCB layout for the PowerSSO-12 package?

Thermal resistance drops from 52 °K/W (junction-to-ambient, no copper) to ~25 °K/W with 3 cm² double-layer copper pour and thermal vias. The exposed pad (Pins 1 & 12) must be soldered to a solid GND plane; insufficient copper area causes thermal shutdown at <300 mA under worst-case ambient conditions.