Component Ordering Codes: A Manufacturer-by-Manufacturer Reference for Procurement Teams

Temperature Grade: The Highest-Consequence Suffix Error

Temperature grade errors carry the most risk because they are the hardest to catch before deployment. A commercial-grade part in an industrial application will pass incoming inspection, pass functional test at room temperature, and fail in the field when operating temperature falls below 0°C or exceeds +70°C. The failure may be intermittent, seasonal, or geographic, and tracing it back to a grade mismatch is time-consuming.

The four grades you will encounter in most product lines are:

Commercial (C): Guaranteed operation from 0°C to +70°C, occasionally to +85°C. The default for consumer electronics in controlled operating environments. Widest availability, lowest price point of the four grades.

Industrial (I): Guaranteed operation from -40°C to +85°C. The standard for embedded systems, instrumentation, factory automation, and any product that will be installed in an uncontrolled environment. If there is no compelling reason to specify commercial grade, industrial is the safer default for most non-consumer applications.

Extended industrial (E): Guaranteed operation from -40°C to +105°C. Used by Microchip Technology and a limited number of other manufacturers for applications that exceed the standard industrial ceiling. Check the datasheet: some manufacturers use E for a different purpose (extended voltage range or extended parameter set rather than temperature extension).

Automotive (A or Q): Components qualified to AEC-Q100 (active ICs), AEC-Q101 (discrete semiconductors), or AEC-Q200 (passive components). The operating range depends on the AEC grade specified within the qualification: Grade 0 covers -40°C to +150°C, Grade 1 covers -40°C to +125°C. Both A and Q are used as suffix letters by different manufacturers to indicate automotive qualification. The specific AEC grade and qualification scope must be confirmed from the datasheet; the suffix letter alone does not tell you which AEC temperature grade applies.

Military (M): Typically -55°C to +125°C or -55°C to +150°C, with qualification to MIL-PRF specifications. Produced in limited quantities by a small number of manufacturers and not available for most modern commercial IC product families.

Where grade appears in the part number

The position of the temperature grade suffix varies by manufacturer. In Microchip's system, it sits after the device family and tape/reel indicator: PIC18F24Q10T-I/ML reads as device (PIC18F24Q10), tape and reel (T), industrial grade (I), QFN package (ML). In STMicroelectronics and many TI product lines, the temperature-range designation is embedded in the main part number string rather than added as a suffix. Confirm the specific position from the ordering information section before interpreting grade suffix letters.

RoHS and Lead-Free Suffixes: Multiple Labels, One Meaning

RoHS compliance for components means the surface finish is lead-free. Different manufacturers introduced different suffix conventions when RoHS came into force in 2006, and each has kept its convention locked in ever since. The practical result is five commonly used suffix systems that mean the same thing.

PBF — Used by: ON Semiconductor, Vishay, Diodes Incorporated, and others Pb is the chemical symbol for lead; PBF stands for Pb-Free. Appears at the end of the ordering code. Frequently combined with a packaging suffix: TRPBF means tape and reel, lead-free. ON Semiconductor also uses G on discrete products to indicate RoHS compliance in conjunction with other suffix elements.

NOPB — Used by: Texas Instruments, legacy National Semiconductor Stands for No Pb (no lead). TI inherited the NOPB convention from National Semiconductor on its acquisition. Appears at the end of the base part number. TI also uses G or G4 in some product families for the same purpose, particularly on product lines with roots in the legacy National Semiconductor catalogue.

Z — Used by: Analog Devices (main ADI product line) Analog Devices' legacy RoHS indicator is a Z suffix appended after the package designator. AD8051ARZ decodes as: AD8051A (device), R (SOIC package), Z (lead-free). This convention is specific to the original ADI product line; parts originating from the Linear Technology acquisition use the TRPBF/NOPB system, which is why the current ADI catalogue contains both styles.

+ — Used by: Maxim Integrated (now part of Analog Devices) Maxim's convention is a + after the package code to indicate RoHS compliance. MAX3232ESE+ is the lead-free variant; MAX3232ESE without + is the leaded version. The + character is unique to Maxim within the major manufacturer set; no other manufacturer uses it as a lead-free designator. Note that +T on a Maxim part adds tape and reel to the lead-free designation: + means lead-free in tube, +T means lead-free in tape and reel.

Infineon: first character of OPN suffix Infineon encodes environmental compliance as the first character of the descriptive identifier appended to the Sales Name. X indicates halogen-free, RoHS compliant, and totally lead-free. H indicates RoHS compliant but not halogen-free. N indicates not RoHS compliant (legacy leaded products still orderable under specific industry exemptions).

What no suffix means Some manufacturers completed their RoHS transition and stopped marking compliance explicitly, making the current production standard the default. Others still offer both leaded and lead-free variants and use suffix codes to distinguish them. If you need documented compliance for CE marking, REACH, or a customer requirement, obtain the declaration of conformity from the manufacturer's compliance portal using the full ordering code rather than inferring from suffix presence or absence.

Packaging Suffixes: TR Is Not Universal

Packaging errors are the most immediately visible type of suffix mistake: a reel delivered to a through-hole insertion line, or a tube of SOICs sent to a pick-and-place machine set up for reel feed, will stop production. The three formats in regular use are tape and reel (carrier tape wound onto a reel, for SMD pick-and-place), tray or matrix tray (JEDEC pocket trays for larger SMD packages such as QFN, BGA, and LGA), and tube or stick (plastic tube for through-hole and SOIC parts in manual or semi-automated assembly).

Tape and reel: how each major manufacturer signals it

STMicroelectronics appends TR to the end of the ordering code. STM32F103C8T6 is the standard part; STM32F103C8T6TR is the tape and reel variant. Note that the T in C8T6 is the package temperature designator within STM's device naming convention, not a reel indicator.

ON Semiconductor uses TR for tape and reel, typically combined with other suffix elements. MMBT2222ALT1G is a tape and reel variant where T1 is part of the packaging code and G indicates RoHS compliance. ON Semi suffixes often layer multiple codes in a single string.

Microchip Technology embeds a T within the part number string, positioned immediately after the base device number and before the temperature grade and package designators. PIC18F24Q10-I/ML is tube delivery; PIC18F24Q10T-I/ML is tape and reel. This T is not a standalone suffix: it occupies a fixed position in Microchip's structured ordering code format.

Maxim Integrated (now Analog Devices) uses +T for tape and reel on lead-free parts. MAX3232ESE+T is the lead-free tape and reel variant. Some older Maxim product lines use -T instead of +T. The distinction between + (tube) and +T (reel) in the Maxim system is easy to miss when searching distributor catalogues, because the + can look like a search wildcard rather than a meaningful part of the ordering code.

Texas Instruments' packaging suffix conventions are not consistent across product families. Many TI lines use no suffix for tube, R or T appended for tape and reel, and X for tape and reel in a quantity of 1,000. Other TI families integrate the package type code (D for SOIC, PW for TSSOP, DBV for SOT-23) within the main part number body with no separate reel indicator. TI's ordering information tables must be read product-by-product.

Analog Devices linear products (from the Linear Technology acquisition) use a suffix structure that combines reel format and lead-free status. TRPBF means standard reel (typically 2,500 parts), lead-free. TRMPBF means mini-reel of 500 parts, lead-free. TR and TRM are the leaded equivalents. The mini-reel variants are the same silicon in a smaller reel intended for prototype and low-volume production.

NXP and Nexperia use a comma-separated suffix on many products, where the packing code follows a comma in the ordering code. Common codes include ,115 for reel and ,518 for bulk. Simpler product lines use TR in the more conventional appended format.

Micron Technology uses TR explicitly for tape and reel. On Micron memory and storage products, the absence of TR means the default packaging is tray. This default is documented in Micron's ordering information but is easy to overlook, particularly when searching distributor inventory where the base part number is listed without packaging suffix detail.

Tray and bulk

Tray (also called matrix tray or JEDEC tray) is the standard packaging for larger SMD packages. Some manufacturers do not add a suffix for tray delivery because it is the implicit default for those package types. Others use explicit designators (TRAY, /TRAY, DT for dry tray). If the datasheet lists tray as an available option and the ordering code you have carries no packaging suffix, confirm the packing format with the distributor before placing the order.

Bulk and tube are the default for through-hole and SOIC packages at most manufacturers when no packaging suffix is present. Confirm this against the specific product's ordering information, as the implicit default varies.

Speed and Performance Grade Suffixes

FPGA and programmable logic

Xilinx and AMD FPGAs use a numeric speed grade preceded by a hyphen. On Artix-7, Kintex-7, Virtex-7, and UltraScale families, -3 is the fastest commercially available grade and -1 is the slowest. The -1L and -2L designators indicate low-voltage core (1.0V) variants with reduced power consumption and lower maximum operating frequency. Speed grade affects both the maximum clock frequency and I/O drive strength specifications.

Intel and Altera FPGAs use a letter-plus-number convention where a lower number indicates better performance: C6 is faster than C7, C7 is faster than C8. This is the opposite direction from Xilinx's numeric convention. On the Intel scheme, speed grade and temperature range are combined within the same suffix string.

Memory timing grades

DRAM and SRAM timing grades are typically encoded as a numeric suffix indicating access time or data rate. SRAM parts with -70 suffix indicate 70ns access time; -45 indicates 45ns. DDR4 and DDR5 parts encode data rate in the part number body. Micron DDR part numbers include a speed encoding before the TR packaging suffix.

The Infineon OPN: Structured Suffix Logic in Practice

Infineon distinguishes between the Sales Name and the Orderable Part Number. The Sales Name (for example, TLE4209G) is the name used in datasheets and on Infineon's product pages. The OPN appends a structured descriptive identifier to the Sales Name, encoding four specific attributes in fixed character positions.

Position 1 — Environmental compliance: X = halogen-free, RoHS compliant, lead-free. H = RoHS compliant, not halogen-free. N = not RoHS compliant (available under exemptions).

Position 2 — Packing type: U = tape and reel, dry packed. O = non-dry tray. B = bulk or tube.

Position 3 — Reel or tray quantity: M = 330mm standard production reel. S = up to 10 units per tray (prototype/low-volume quantities).

Positions 4–5 — Variant designator: A1, A2, B1, etc. The variant increments when a new supply product number is created for an internal change — a new qualified manufacturing site, for example — that does not affect the Sales Name or the first three OPN characters. For procurement purposes, A1 and A2 of the same Sales Name are interchangeable; they are the same device.

Reading an Infineon OPN: TLE4209GXUMA1 = Sales Name TLE4209G, X (halogen-free/RoHS/lead-free), U (tape and reel dry), M (330mm reel), A1 (first variant). FZ900R12KE4HOSA1 = Sales Name FZ900R12KE4, H (RoHS, not halogen-free), O (non-dry tray), S (up to 10 per tray), A1.

A common point of confusion with Infineon parts is that the product page on infineon.com displays the Sales Name while distributor listings (Digi-Key, Mouser, RS) display the OPN. They refer to the same device. The Sales Name carries no packaging or compliance information; the OPN does. When cross-referencing, match on the Sales Name, then read the OPN suffix for the variant you need.

Infineon publishes a full OPN Translation Table at infineon.com that covers every valid character combination. It is the definitive reference for Infineon OPN suffixes.

Suffix Ambiguity in the Secondary and Spot Markets

Suffix errors are more common in secondary and spot market procurement than in authorised distribution because secondary listings are frequently less complete. A base part number without a packaging or grade suffix may represent any of several ordering variants, and the specific variant in a lot can only be confirmed by inspecting the original reel labels, date code markings, and any available paperwork.

Common secondary market suffix risks:

Packaging format not stated: A lot listed as "TLE4209GXUMA1" specifies tray or reel at the OPN level, but a lot listed only as "TLE4209G" does not. If the listing does not carry the full OPN, the actual packaging format is unknown until the parts are received or the seller is asked to confirm from the reel label.

Grade conflation: Commercial and industrial variants of the same device share the same base part number and are often physically identical packages from the same die. Without the full ordering code or the original reel label, distinguishing C from I grade requires documentation from the original reel. This is a material distinction: the silicon is tested to different temperature extremes at the factory, and there is no meaningful field test that can replicate that qualification retrospectively.

RoHS documentation gaps: A secondary lot may carry parts with a lead-free surface finish without the corresponding compliance documentation. If your supply chain requires documented RoHS compliance (for CE marking or customer audit), documentation must be traceable to an original manufacturer certificate. Presence of a lead-free suffix on the part number is necessary but not sufficient: the documentation must accompany it.

Deliberate mislabelling: In counterfeit scenarios, a faster or more expensive grade may be stamped over a slower or cheaper one. Curve tracer testing, independent lab verification, and visual inspection under magnification are the detection methods for grade fraud. Confirming that the physical marking matches the order code is a required step, not an optional check.

When sourcing from secondary channels, Maketronics requests the full OPN from the seller, verifies it against the physical reel label at intake, and where compliance documentation is required, obtains it before any parts are committed to a customer. A lot that matches on the base part number but cannot be confirmed against the full ordering code is treated as unverified until that confirmation is available.

Before You Place the Order: Five Checks

Check the manufacturer's ordering information section, not just the part number. Distributor search results return the ordering code without necessarily explaining what each suffix segment means. The ordering information section of the product datasheet is the primary authority.

Do not carry suffix assumptions from one manufacturer to another. You cannot apply what you know about TI's NOPB suffix to an ON Semiconductor part, or Microchip's temperature grade position to a Xilinx device. Treat each manufacturer's system as independent.

Identify the implicit default packaging before assuming. If the part number carries no packaging suffix, the default may be tray (Micron), tube (most through-hole), or vary by product family (TI). When in doubt, ask the distributor to confirm what packaging will ship before the order is placed.

Obtain compliance documentation for the full OPN, not the base part number. Manufacturer compliance portals (such as TI's online RoHS certificates or Infineon's product compliance page) are keyed to the full ordering code. A search on a base part number may return compliance status for a different variant.

For secondary market purchases, require the full OPN from the lot documentation. The base part number is not sufficient to confirm grade, packaging format, or compliance status. The reel label, factory sealed bag markings, and accompanying documentation must all reference the same full OPN.

Part number suffixes are not decoration. Every character group encodes a specific attribute of the part you will receive, and the consequences of misreading them range from an operational delay (wrong packaging format) to a field reliability problem (wrong temperature grade) to a compliance failure (undocumented lead-free status). The difficulty is that the code you need to read is manufacturer-specific rather than industry-standard. Building the habit of reading ordering information before placing an unfamiliar part — not just confirming the base part number — is the single most effective preventative step.

Sourcing a constrained component and need to confirm you have the right suffix variant? Talk to the Maketronics team — we verify packaging, grade, and compliance documentation on every secondary market lot before it is recommended.