Decoding the AT32 Part Number: How to Specify Exactly What You Need

When you are buying or substituting a microcontroller, the part number is the contract. It tells the supplier exactly what to ship and tells your manufacturing team exactly what will land on the board. Artery's AT32 naming follows a logical structure, and five minutes spent decoding it prevents the expensive mistake of receiving a part that looks right but will not fit or will not qualify.

The structure of an AT32 part number

Take a representative device such as the AT32F403ACGT7. Reading left to right:

• AT32 — the brand (Artery) and the 32-bit Arm Cortex-M platform.
• Family letter — F for mainstream, L for low-power, M for motor control, WB for wireless (Bluetooth LE), A for automotive-grade.
• Sub-family digits — 403, 405, 407, 413, 415, 421, 423, 425, 435, 437 and others indicate the performance tier and peripheral mix.
• Package and pin code — letters and digits near the end encode the package (LQFP, QFN, QFP) and the pin count.
• Temperature and grade suffix — the final characters mark the operating temperature range and any grade variation.

What each family is actually for

Common ordering mistakes

• Trimming the suffix. Dropping the package or temperature suffix to "simplify" the order is the fastest way to get a part that does not fit the land pattern.
• Assuming pin-compatibility from the model alone. Two devices with the same core can sit in different packages; always confirm the footprint.
• Mixing silicon revisions. If your firmware was validated on one revision, ask for the same one and record it per lot.

How we help you specify correctly

Send us the exact AT32 part you need - full number, package and quantity - and we will confirm availability and date code before anything ships. For substitution work, the AT32F415 and AT32F421 families are frequently evaluated as alternatives to older mainstream devices. Browse the full microcontroller range and we will quote on real numbers.

Frequently asked questions

What does the AT32 prefix actually mean?

AT32 is the product family name of Artery Technology, a Chinese microcontroller vendor. The 'AT' prefix is the brand; '32' signals a 32-bit Arm Cortex-M core. Everything after that encodes the family, performance tier, package, pin count and temperature grade. Decoding it is the first step to ordering the exact part you need.

How do I read the family and sub-family digits?

After AT32 you usually see a letter for the family (F = mainstream, L = low power, M = motor control, WB = wireless with Bluetooth LE, A = automotive) followed by digits for the sub-family and performance tier, such as 403, 415, 421, 423, 435 or 437. A higher number generally means more flash, more RAM and richer peripherals within that family.

What do the package letters and pin-count digits tell me?

Letters near the end such as C, R, V, Z, T or U mark the package (LQFP, QFP, QFN and so on), and the following digits give the pin count. T7, for example, is a common LQFP package grade. Getting the package wrong means the part will not fit your footprint even if every electrical parameter matches.

Why does decoding the number matter when sourcing?

Two parts that look identical on a spreadsheet can differ in package, temperature grade or silicon revision. Specifying the full, exact part number - and confirming it against the manufacturer's datasheet - is how you avoid receiving a part that cannot be placed on your board or qualified for your environment.

About us & trademarks: JTDZ Tech (Shenzhen Jingteng Electronics Technology Co., Ltd.) is an independent distributor of electronic components. We are not an authorised distributor or representative of the manufacturers named in this article. Manufacturer and part names are used for indicative purposes only, to help identify the components discussed; all trademarks remain the property of their respective owners. Always verify specifications against the manufacturer's datasheet before design-in or purchase.