Littelfuse RUEF090

RUEF090 variants from Littelfuse

RUEF090 Datasheet

Variants

Mfr

Littelfuse

Lifecycle

Active

RUEF090 Overview

What changes between part numbers, and what to check before you lock the BOM — Microcontrollers.

Key Features

Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.

Target Applications

Microcontrollers — design-in and field replacement
BOM scrub where only the base prefix is known but suffix is TBD
Second-source checks when the original MPN is constrained

Ordering Variants

Compare 2 RUEF090 part numbers by package, electrical parameters, lifecycle, and availability. Use RFQ for stock and lead-time confirmation.

Part Number	Description	Manufacturer	Lifecycle	RoHS	Availability	Action
RUEF090	PTC Resettable Fuse, 0.22 Ohm, Radial Leaded, 2-Terminal	Littelfuse	Active	Compliant	In Stock	RFQ
RUEF090-2	PTC Resettable Fuse, 0.22ohm, Through Hole Mount, RADIAL LEADED, ROHS COMPLIANT	Littelfuse	Active	Compliant	In Stock	RFQ

Ordering Code Differences

How suffixes on RUEF090 map to package, grade, and reel options.

How to Choose the Right RUEF090 Microcontrollers

📦

Match the footprint first

Pull the exact package drawing for your MPN — base-number swaps fail most often at the footprint, not the schematic.

⚡

Electrical headroom

Compare voltage and current columns in the variant table. For RUEF090, a suffix with lower voltage or current rating will not survive the same circuit without recalculation.

🌡️

Temp grade letter matters

Commercial (0–70 °C) and industrial (−40–85 °C+) suffixes look similar in the prefix — confirm ambient + self-heating, not just the first page of the datasheet.

🔢

Copy the full MPN

Do not BOM only "RUEF090" — include the full suffix (e.g. 2). RFQ with reel/tube preference and required date code.

Technical Specifications

Core parameters for RUEF090 product family

Identity

Base Model

RUEF090

Manufacturer

Littelfuse

Listed Variants

Variant Parameters

Lifecycle Status

Active

RoHS Status

Compliant

Source RUEF090 with Octatronics

Request stock confirmation, lead time, date code, and pricing for all 2 ordering variants from Littelfuse. Our team supports active, EOL, and hard-to-find component sourcing.

Original manufacturer parts with traceability options
BOM upload and multi-line RFQ support
Package, grade, and compliance verification

Request Quote View Littelfuse Browse all base models →

Frequently Asked Questions

Common technical questions about the RUEF090 product family.

Is RUEF090 a single part I can order, or a family prefix?

RUEF090 is a base / family code from Littelfuse. You order a full MPN such as RUEF090, RUEF090-2. The variant table lists 2 orderable lines with different suffixes.

What do the suffix letters on RUEF090 part numbers mean?

Listed suffix fragments include: 2. Typically they encode package (see Package column), temperature grade, and tape/reel option. Always decode on the Littelfuse datasheet ordering guide — do not guess from pattern alone.

What is the lifecycle status of RUEF090 variants?

Lifecycle values in our listing: Active. Status is per MPN suffix — one variant can be Active while another is NRND. Check PCN for your exact suffix before multi-year commitments.

What should I send for an RFQ on RUEF090?

Full manufacturer MPN (not just RUEF090), quantity, needed date code, reel vs tube, and any compliance docs (CoC, RoHS, conflict minerals). If you only know the base prefix, include a photo of the existing label or reel.

Where is the RUEF090 datasheet?

Use the datasheet link in the page header. Cross-check electrical curves (SOA, saturation voltage, etc.) against your operating point — the table summarizes order codes, not every graph in the PDF.