AURIX TC397XA Sourcing: Order-Code and Supply Verification

Table of Contents

• Turn TC397XA Into a Controlled Part Identity
• Confirm the TC39xXA Technical Baseline
• Keep TC397XA, TC397XP, and Other Variants Separate
• Treat BC and BD as a Controlled Silicon-Step Change
• Specify Package, Packing, and Moisture Controls
• Verify Lifecycle and Supply Without Trusting the Search Result
• Build a Lot-Level Automotive Evidence Package
• Release Samples Before Committing Production Volume
• Define Alternatives Before the Shortage Becomes Urgent

“TC397XA” is a useful search term but an incomplete purchasing identity. It can refer to an AURIX family, a productive microcontroller, a development kit, a software target, or a shortened reference that omits the silicon step and ordering suffix. Procurement cannot safely turn that family term into a purchase order without engineering and quality controls.

For SAK-TC397XA-256F300S-BC, the final BC matters. Infineon also publishes a current BD product page, and search results often mix the two. Similar core count, frequency, memory, and package do not prove that silicon steps are interchangeable in an automotive design.

This guide uses the Infineon TC39xXA family brief and current product materials to define the family baseline, then keeps lifecycle, suffix, and lot verification separate. Buyers looking for the specific site record can use the SAK-TC397XA-256F300S-BC product page as an RFQ entry point, not as sole evidence of real-time stock.

Turn TC397XA Into a Controlled Part Identity

Start with the complete sales part number exactly as approved on the bill of materials. Record punctuation and suffixes, then map it to the orderable product number (OPN) shown in controlled manufacturer material. Historical Infineon product material for the BC version identifies TC397XA256F300SBCKXUMA1 as an OPN associated with the sales name SAK-TC397XA-256F300S BC.

Do not automatically insert or remove hyphens when matching supplier systems. A distributor may store the sales name, the compact OPN, an internal SKU, or a legacy alias. The quote should show the manufacturer’s complete identity alongside the distributor SKU so receiving can reconcile the label and purchase order.

The RFQ should also state whether BC is mandatory. If a supplier offers BD, another TC397 feature package, or an engineering sample, treat it as a deviation requiring written approval. A shortened quote for “TC397XA 256F300S” leaves the most important distinction unresolved.

Confirm the TC39xXA Technical Baseline

Infineon’s official product brief identifies SAK-TC397XA-256F300S within the AURIX TC39xXA family. The published baseline includes six TriCore processors running at up to 300 MHz, 16 MB of flash, approximately 6.9 MB of SRAM, two signal-processing units for radar workloads, 1 Gbit Ethernet, twelve CAN FD nodes, an eVita Full hardware security module, and an LFBGA-292 package.

The current Infineon BD product page lists the BD product as active and preferred and associates it with ADAS, autonomous-driving domain control, and automotive camera applications. It also lists a -40°C to 125°C temperature range and ASIL-D support.

Those family and BD facts help verify that a quote is in the right product area. They do not authorize use of a BD-step document as the sole specification for a BC-step device. The controlled design record should identify which datasheet, addendum, errata, safety manual, user manual, and software release apply to the approved step.

Keep TC397XA, TC397XP, and Other Variants Separate

AURIX naming carries feature information. The TC397 base identifies a high-end TC3xx device, while following feature letters distinguish variant content. Devices can differ in radar interfaces, signal-processing resources, camera interfaces, emulation capability, external-bus behavior, and other functions even when package and top-line memory appear similar.

A board footprint match is therefore only one condition. Engineering must compare the variant table, pin functions, clocking, power, peripheral instances, safety mechanisms, security configuration, boot behavior, errata, and software dependencies. Production test and calibration can also be tied to a specific silicon step.

The existing TC233L and TC397XP sourcing article addresses different AURIX parts and supply risks. It should not be used as approval to substitute TC397XP for TC397XA.

Identity level	Example	Purchasing use
Family/search term	TC397 or TC397XA	Find the relevant product family and documents
Sales product name	SAK-TC397XA-256F300S BC	Freeze the approved device and step
OPN	TC397XA256F300SBCKXUMA1	Match order systems and labels
Distributor SKU	Seller-specific	Administrative lookup only
Customer part number	Internal AML/BOM identifier	Link design approval to procurement

All five may appear in a transaction, but only a documented mapping keeps them from becoming accidental substitutes.

Treat BC and BD as a Controlled Silicon-Step Change

BC and BD suffixes indicate different product steps. A later step may correct errata, change test limits, alter behavior, update qualification, or carry a different orderable number. It may be suitable for a design, but suitability must be demonstrated through the manufacturer’s change documentation and the customer’s change-control process.

Before approving a proposed BC-to-BD move, request and review:

1. the applicable TC39x variant datasheet addenda for both steps;
2. device errata and any software or compiler workarounds;
3. safety manual, safety case assumptions, and qualification evidence;
4. security and hardware security module impacts;
5. package, pin, electrical, thermal, and marking comparisons;
6. product change notifications and sample availability;
7. regression, functional-safety, EMC, timing, and production-test scope.

A supplier statement that the parts are “the same except revision” is not an engineering comparison. In an automotive program, record the approval in the approved manufacturer list, software baseline, PPAP or customer notification process as applicable.

Specify Package, Packing, and Moisture Controls

The current Infineon BD product page lists PG-LFBGA-292, tape-and-reel packing, a packing size of 1,000, Moisture Sensitivity Level (MSL) 3, and dry packing for its orderable BD configuration. Historical BC material also identifies PG-LFBGA-292. The buyer should still obtain packing data for the exact BC OPN being quoted rather than copying BD logistics fields into the BC purchase order.

Ask the supplier to state whether the quantity is a complete factory reel, partial reel, or repacked lot. Require label images showing the sales product name or OPN, quantity, lot and date identifiers, and packing references. For partial reels, define how the remaining material was handled, counted, resealed, and mapped to the original label.

MSL control affects receiving. The purchase order should require intact dry packaging where applicable, humidity indicator and desiccant condition, seal integrity, and evidence needed to establish remaining floor life. Do not open a sealed bag for photography without an approved handling and resealing plan.

Verify Lifecycle and Supply Without Trusting the Search Result

Infineon currently describes the BD version as active and preferred. That status should not be generalized to every historical step or every distributor listing. For a BC requirement, request current lifecycle confirmation for the exact OPN, any last-order or shipment dates, and the PCN trail that explains migration to later steps.

Likewise, an online “in stock” flag is not proof of physical, allocated inventory. Confirm:

• the legal entity that owns the parts;
• physical location and quantity available to allocate;
• number of lots and quantity by lot;
• original factory-seal and label condition;
• source and chain-of-custody records;
• date the inventory was physically verified;
• promised shipment date and quote-validity period.

If supply is factory lead time, require a manufacturer or authorized-channel acknowledgment before treating the date as committed. The Infineon brand page can help locate related products, but the manufacturer network and exact authorization scope should be checked with Infineon for the territory and product line.

Build a Lot-Level Automotive Evidence Package

A TC397XA lot may enter a safety-related, security-sensitive, or long-lived vehicle program. The acquisition package should preserve the purchase order, supplier quote, manufacturer and distributor identity, packing list, invoice, certificates, label photos, date and lot codes, country information, receiving inspection, moisture records, and all approved deviations.

For non-authorized or brokered material, add the ownership trail and a risk-based authenticity test plan. Testing does not repair a broken chain of custody, and a passed sample does not prove every unit in a mixed lot. Keep lots physically and digitally separated through inspection and production release.

Confirm whether the project requires a single date code, single assembly site, or specific change-notification history. These restrictions can reduce available supply and increase surplus, so apply only requirements supported by the product, process, customer, or reliability plan. Use the site’s traceability guidance to structure the record set.

Release Samples Before Committing Production Volume

A sourcing plan should create gates, not jump from a catalog result to a production order. Begin with document review and part-identity confirmation. Then inspect representative samples for marking, dimensions, package condition, X-ray consistency where justified, solderability risk, and electrical behavior under the project’s approved plan.

Engineering validation should cover the interfaces and safety functions actually used by the design. For an ADAS or domain-controller application, that may include radar-processing paths, Ethernet, CAN FD, security provisioning, boot behavior, diagnostic coverage, timing, thermal operation, and software workarounds. The exact scope comes from the product safety plan and change assessment, not from a generic incoming-inspection checklist.

Only after documentation, lot inspection, and functional evidence are accepted should procurement commit the production quantity—especially if the order is NCNR. Keep the sample identifiers tied to the parent lot so the result cannot be reused to qualify unrelated inventory.

Define Alternatives Before the Shortage Becomes Urgent

The best time to evaluate a later silicon step or related AURIX variant is before the approved BC supply is exhausted. Create an alternative matrix that distinguishes direct replacements, replacements requiring software or validation changes, and devices requiring board redesign.

For each candidate, compare the full OPN, feature package, silicon step, package and pinout, memory, interfaces, safety and security support, lifecycle, development tools, software baseline, errata, and qualification burden. A generic “TC397” cross-reference is not enough.

The broader transmission-control-unit semiconductor guide can support system-level planning, but the TC397XA release decision must stay with the controlled automotive design and its evidence.