Littelfuse SP4021

SP4021 variants from Littelfuse

SP4021 Datasheet

Variants

Mfr

Littelfuse

Lifecycle

Active

SP4021 Overview

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

Key Features

Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.
2 distinct suffix patternsExamples: 01FTG, 01FTG-C. Decode suffix meaning in the ordering notes under the variant table.

Target Applications

TVS Diodes — 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 SP4021 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
SP4021-01FTG	TVS Diode 5V 600W 25A Unidirectional SMD	Littelfuse	Active	Compliant	In Stock	RFQ
SP4021-01FTG-C	TVS Diode Bidirectional 5V 600W SMD	Littelfuse	Active	Compliant	In Stock	RFQ

Ordering Code Differences

How suffixes on SP4021 map to package, grade, and reel options.

How to Choose the Right SP4021 TVS Diodes

📦

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 SP4021, 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 "SP4021" — include the full suffix (e.g. 01FTG, 01FTG-C). RFQ with reel/tube preference and required date code.

Technical Specifications

Core parameters for SP4021 product family

Identity

Base Model

SP4021

Manufacturer

Littelfuse

Listed Variants

Variant Parameters

Lifecycle Status

Active

RoHS Status

Compliant

Source SP4021 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 SP4021 product family.

Is SP4021 a single part I can order, or a family prefix?

SP4021 is a base / family code from Littelfuse. You order a full MPN such as SP4021-01FTG, SP4021-01FTG-C. The variant table lists 2 orderable lines with different suffixes.

What do the suffix letters on SP4021 part numbers mean?

Listed suffix fragments include: 01FTG, 01FTG-C. 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 SP4021 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 SP4021?

Full manufacturer MPN (not just SP4021), 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 SP4021 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.