STMicroelectronics L4892CV

Overview

L4892CV from STMicroelectronics is a 12 V fixed-output, very low-dropout linear voltage regulator in TO-220 package, delivering up to 400 mA output current with typical dropout voltage of 0.4 V at full load, ±4% output voltage tolerance at 25°C, and integrated reverse polarity, ±60 V transient, overvoltage, foldback current limiting, and thermal shutdown protection - designed for automotive 12 V logic and sensor supply rails.

For engineers reviewing the L4892CV datasheet, L4892CV pinout, L4892CV application, or L4892CV equivalent, key selection criteria include dropout performance under low-input conditions (e.g., cold-crank battery), quiescent current at standby (1.2–3 mA), transient immunity (±60 V load dump), thermal resistance (4 °C/W junction-to-case), and stability with low-ESR capacitors down to –40 °C.

Technical Context

The L4892CV employs an internal PNP pass transistor architecture enabling sub-0.5 V dropout at 400 mA, with on-chip foldback current limiting that reduces short-circuit current to 230–500 mA depending on junction temperature. Its protection circuitry responds to reverse input polarity, field-decay transients (τ_r = 33 ms), and load-dump events (τ_f = 100 ms) without external components.

Regulation is maintained across –40 °C to +125 °C junction temperature, with line regulation of 2–15 mV/V and load regulation of 5–25 mV/V. Output voltage drift is specified at 0.1 mV/°C·V, and supply voltage rejection reaches 60 dB at 320 Hz with 100 µF output capacitance.

Key Specifications

Pinout & Package

Package: TO-220 (3-pin, vertical mounting, tab connected to Pin 2). Thermal resistance: R_{th j-case} = 4 °C/W, R_{th j-amb} = 75 °C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12 V low-dropout regulator applications.

Compared with TL783CKTTR and LM2940CT-12, L4892CV uniquely integrates reverse polarity immunity and foldback limiting in a single TO-220 package, reducing system-level protection components while maintaining lowest dropout and lowest standby current among the three.

Availability

L4892CV is available at Aetrix Electronics and suitable for automotive ECU sensor supplies, industrial PLC I/O modules, battery-backed telematics, and off-road vehicle instrument clusters requiring stable component supply across extended temperature and transient-voltage conditions.

Supply support for L4892CV 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 headquartered in Geneva, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets with emphasis on reliability and automotive-grade qualification.

The L4800 series belongs to ST's automotive-grade linear regulator product line, engineered specifically for harsh-environment 12 V systems where dropout, transient immunity, and reverse-polarity survival are critical design requirements.

FAQ

What is the minimum input voltage required for regulation at full 400 mA load?

The L4892CV maintains 12 V regulation with input as low as 12.4 V (12.0 V + 0.4 V dropout) at 300 mA per datasheet test condition. At 400 mA, worst-case dropout is 0.9 V, so minimum functional input is 12.9 V. Below this, output voltage drops linearly with input.

Can L4892CV operate with ceramic output capacitors?

Yes, but only if ESR is ≥ 0.1 Ω and capacitance ≥ 100 µF. The regulator requires minimum ESR for phase margin; low-ESR ceramics may cause instability unless a small series resistor (e.g., 0.22 Ω) is added. Tantalum or polymer aluminum capacitors are preferred for production stability.

Is the TO-220 tab electrically isolated from the internal ground?

No - Pin 2 (the metal tab) is internally connected to GND. When mounting to a heatsink, electrical isolation using mica washers or insulating pads is mandatory unless the heatsink is grounded and non-hazardous. Failure to isolate may cause short circuits or safety hazards.

Does L4892CV require an input capacitor?

An input capacitor is not strictly required for stability but is strongly recommended: 10 µF aluminum or 1 µF ceramic placed within 10 mm of Pin 1 suppresses high-frequency noise and improves transient response to load dump events. It also reduces input trace inductance that could exacerbate voltage spikes.