STMicroelectronics STB21N

STB21N variants from STMicroelectronics

Variants

Mfr

STMicroelectronics

Lifecycle

Active

STB21N Overview

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

Key Features

Lifecycle mix: ActiveConfirm lifecycle on the exact MPN, not just the base number prefix.
2 distinct suffix patternsExamples: 65M5, 90K5. Decode suffix meaning in the ordering notes under the variant table.

Target Applications

MOSFETs — 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 STB21N 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
STB21N65M5	650V 17A N-CH MOSFET D2PAK, 150mR Rds(on)	STMicroelectronics	Active	Compliant	In Stock	RFQ
STB21N90K5	900V N-Channel MOSFET, 18.5A, 299mR Rds On, D2PAK	STMicroelectronics	Active	Compliant	In Stock	RFQ

Ordering Code Differences

How suffixes on STB21N map to package, grade, and reel options.

How to Choose the Right STB21N MOSFETs

📦

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 STB21N, 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 "STB21N" — include the full suffix (e.g. 65M5, 90K5). RFQ with reel/tube preference and required date code.

Technical Specifications

Core parameters for STB21N product family

Identity

Base Model

STB21N

Manufacturer

STMicroelectronics

Listed Variants

Variant Parameters

Lifecycle Status

Active

RoHS Status

Compliant

Source STB21N with Octatronics

Request stock confirmation, lead time, date code, and pricing for all 2 ordering variants from STMicroelectronics. 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 STMicroelectronics Browse all base models →

Frequently Asked Questions

Common technical questions about the STB21N product family.

Is STB21N a single part I can order, or a family prefix?

STB21N is a base / family code from STMicroelectronics. You order a full MPN such as STB21N65M5, STB21N90K5. The variant table lists 2 orderable lines with different suffixes.

What do the suffix letters on STB21N part numbers mean?

Listed suffix fragments include: 65M5, 90K5. Typically they encode package (see Package column), temperature grade, and tape/reel option. Always decode on the STMicroelectronics datasheet ordering guide — do not guess from pattern alone.

What is the lifecycle status of STB21N 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 STB21N?

Full manufacturer MPN (not just STB21N), 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.