EAR LT1121CZ-5

Mfr. Part

LT1121CZ-5

Manufacturer

EAR

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Detailed Description

5V low-dropout linear regulator in a TO-92 through-hole package

Part of the LT1121 regulator series; fixed 5V output; micropower design suitable for battery-based systems

Category: Integrated Circuits (ICs) | Specialized ICs

Stock availability: 5962 units (subject to change)

Case code reference: 658

Key Features

Fixed 5V regulated output

Low dropout design for better efficiency from higher-voltage sources

Micropower quiescent current suitable for long battery life (see datasheet for exact values)

Output current capability up to around 100 mA typical for this series

Built-in protection features such as thermal shutdown and short-circuit protection

Stable operation with recommended output capacitors

Wide input voltage range suitable for 5V regulation (check datasheet specifics)

Simple three-pin through-hole implementation

Key Advantages

Extends battery life thanks to very low quiescent current

Minimal external parts reduce design time and cost

Robust protections improve reliability in real-world use

Easy assembly and maintenance with TO-92 package

Good line and load regulation for a clean 5V rail

Packaging

Type: TO-92, 3-lead, through-hole

Material: Molded epoxy body with tin-plated leads

Size: Standard TO-92 dimensions (compact body, suitable for dense boards; refer to datasheet for exact measurements)

Case code: 658

Pin configuration (typical when looking at the flat face): Pin 1 GND, Pin 2 VOUT, Pin 3 VIN. Always verify the exact pinout in the datasheet.

Thermal characteristics: Suitable for low-to-moderate currents in free air; typical junction-to-ambient thermal resistance in the 180–220°C/W range; see datasheet for precise ratings and derating curves.

Electrical properties: Fixed 5V output; low dropout (sub-1V typical at moderate load); low quiescent current; good line/load regulation; low output noise with proper bypassing; requires an output capacitor as specified in the datasheet for stability.

Lifecycle

Status: Mature and widely used. Availability may vary by lot and region.

Nearing discontinuation: Not indicated at present. For the latest status, confirm with our sales team.

Equivalent or alternative models:

- Analog Devices (Linear Technology) LT1121-5 series in alternate packages (e.g., TO-220, SO-8, SOT-223) for different thermal needs

- Texas Instruments LP2950CZ-5.0 (TO-92, micropower LDO, 5V)

- Texas Instruments LM2936Z-5.0 (TO-92, low quiescent 5V regulator, ~50 mA)

- ON Semiconductor LP2950CZ-5.0 (TO-92, second-source for LP2950)

- General-purpose 78L05 (TO-92, 5V, not low-dropout; use when higher dropout is acceptable)

If you need exact cross-match or vetted functional equivalents, please contact our sales team via our website for a tailored list and technical confirmation.

Key Application Areas

Battery-powered devices and portable instruments

Embedded systems needing a clean 5V rail from a higher battery voltage

IoT sensors and communication nodes

Industrial control modules and measurement equipment

Automotive low-current auxiliary 5V rails (verify automotive-grade requirements in datasheet)

Consumer electronics, wearables, and handheld gadgets

Datasheet

Our website hosts the most authoritative datasheet for LT1121CZ-5. Download it on this page for full specifications, pinout details, recommended capacitors, thermal data, and application notes.

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