STMicroelectronics LE80CD-TR

Overview

LE80CD-TR from STMicroelectronics is a very low-dropout (LDO) linear voltage regulator delivering a fixed 8 V output with ±2% accuracy at 25 °C, 100 mA maximum output current, 0.2 V typical dropout voltage, and TTL-compatible inhibit control (pin 5) in SO-8 package - designed for local regulation in battery-powered or low-noise embedded systems requiring standby power reduction.

For engineers reviewing the LE80CD-TR datasheet, LE80CD-TR pinout, LE80CD-TR application, or LE80CD-TR equivalent, this device supports precise 8 V rail generation with ultra-low quiescent current (70 µA typ. in OFF mode), high PSRR (72 dB @ 120 Hz), and thermal/current protection - critical for automotive body electronics, industrial sensor nodes, and portable instrumentation.

Technical Context

The LE80CD-TR implements a CMOS-based LDO architecture with internal foldback current limiting and thermal shutdown, enabling robust operation across –40 to 125 °C junction temperature. Its inhibit input accepts TTL-level logic (V_IL ≤ 0.8 V, V_IH ≥ 2 V) to disable regulation and reduce quiescent current to <140 µA.

Stability is achieved with only a 2.2 µF ceramic output capacitor (ESR 0.1–10 Ω), eliminating need for large electrolytics. Input voltage range spans 9–18 V, supporting wide-input industrial supplies while maintaining 8 V output regulation under load up to 100 mA.

Key Specifications

Pinout & Package

LE80CD-TR is supplied in an SO-8 package (ECOPACK® compliant), with pins 2, 3, 6, and 7 internally fused to the die attach pad for enhanced thermal performance (R_thJA = 55 °C/W). The exposed thermal pad must be connected to a minimum 100 mm² copper pour for full power dissipation capability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LDL112M80R and TLV70780PDQNR, LE80CD-TR uniquely balances 100 mA capability, TTL inhibit control, SO-8 thermal performance, and full industrial temperature protection - making it optimal for regulated subsystems requiring both power gating and reliability.

Availability

LE80CD-TR is available at Aetrix Electronics and suitable for automotive body electronics, industrial sensor transmitters, portable medical monitors, and smart energy meters requiring stable component supply with long lifecycle support.

Supply support for LE80CD-TR 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, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and consumer markets.

The LEXX series was developed specifically for low-power, low-noise local regulation in harsh-environment embedded systems - emphasizing dropout efficiency, thermal resilience, and ease of integration via standard packages and minimal external components.

FAQ

What is the minimum input voltage required for LE80CD-TR to maintain 8 V output at 100 mA?

The LE80CD-TR requires a minimum input voltage of 8.2 V to sustain regulation at 100 mA, based on its 0.2 V typical dropout voltage. At worst-case conditions (T_J = 125 °C), dropout rises to 0.5 V, so 8.5 V input is recommended for guaranteed operation across temperature.

Can the INH pin be left floating, and what happens if it is?

No - the INH pin must not be left floating. Per the datasheet, an unconnected INH pin defaults to ON mode but risks noise-induced toggling. For reliable operation, tie INH to GND when inhibition is unused, or drive it actively with a clean TTL signal when implementing power gating.

Is the SO-8 package thermally enhanced, and how should the thermal pad be handled?

Yes - the SO-8 package uses internal fusion of pins 2, 3, 6, and 7 to the die attach pad, reducing R_thJA to 55 °C/W. The exposed thermal pad must be soldered to a ≥100 mm² copper area with ≥4 thermal vias (0.3 mm diameter) to a solid inner-layer ground plane for effective heat transfer.

Does LE80CD-TR require an input capacitor, and what value is recommended?

Yes - a 0.1 µF ceramic capacitor is required between IN and GND, placed within 2 mm of the device. This stabilizes the input impedance and suppresses high-frequency noise from upstream supplies; larger values offer no benefit and may degrade transient response.