Attribute Schema Library
Attribute schemaelectronic components

Resistors Attributes for Electronic Components Distributors

Resistors are the highest-volume line in the passive aisle and the lowest-margin. Three buyers show up: EMS procurement pulling a BOM, design engineers filtering a parametric rail at 11pm, and repair buyers matching a marking code off a dead board. All three arrive with a value, a package size and a tolerance, and expect the filter to close in three clicks.

The category is a variant explosion with a notation problem on top. One thick-film series spans ten case sizes, six tolerances, five TCR grades and the full E96 decade - hundreds of thousands of orderable parts from one datasheet, where the spec separating them is a table row, not a feed field. Resistance itself arrives as 4K7, 472, 4.7k and 4700 from suppliers who are all correct: IEC 60062, the 3-digit SMD code, EIA-96 and plain ohms are separate marking standards that coexist.

The package code is ambiguous by construction - 0402 is 1.0 x 0.5 mm imperial, 0.4 x 0.2 mm metric. And the numbers buyers decide on sit inside the PDF, per case size, which is where parametric extraction stops.

Core

Every SKU needs these. Without them the record is not a product, it is a row.

Manufacturer Part Number (MPN)
identifier
RC0805FR-074K7L

The only key that resolves a BOM line. Suffixes encode tolerance, packaging and reel size, so the base series number is not a sellable part.

GTIN-13 / UPC
identifier
4718381076283

Required by Amazon Business and any retail-facing channel. Assigned per orderable packaging, so the 7 in and 13 in reels carry different codes.

Resistance
number · Ω
4700

The first filter every buyer touches. Must be numeric to support range queries across 12 decades, from milliohm shunts to gigaohm bias parts.

Resistance Tolerance
enum · %
±1 %

Separates a 5% E24 part from a 1% E96 part at the same nominal value. Drives price and drives which E-series values even exist.

Power Rating (P70)
number · W
0.125

Rated dissipation at 70 °C ambient, derated to zero at the max film temperature. Buyers size on it and it caps the case size choice.

Package / Case
enum
0805 (2012 Metric)

Sets the footprint. Must state the measurement system: imperial 0402 is 1.0 x 0.5 mm; metric 0402 is 0.4 x 0.2 mm - a different part.

Mounting Type
enum
Surface Mount

Splits the catalog before any other facet. SMT chip, MELF, axial through-hole and chassis-mount are non-substitutable.

Composition
enum
Thick Film

Predicts noise, stability, TCR and pulse behaviour. Thin film for precision, thick film for volume, wirewound for power, foil for metrology.

Operating Temperature Range
range · °C
-55 °C to +155 °C

Gates automotive and downhole use. -55 to +155 °C is common for thick film; carbon composition and some wirewound stop well short.

Packaging
enum
Tape & Reel, 13 in, 5,000 pcs

The orderable unit. 7 in vs 13 in reel changes MOQ by 5x; cut tape and bulk serve prototype buyers a reel-only record turns away.

Differentiating

What buyers actually compare on. This is where catalogs win or lose the filter.

Temperature Coefficient (TCR)
number · ppm/°C
±100

The precision axis. Thick film runs ±100 to ±250; thin film reaches ±5; bulk metal foil goes lower. Filtered before tolerance by analog buyers.

Maximum Working Voltage
number · V
150

The limit that binds above ~180 kΩ on an 0805, where P = V²/R reaches the rated voltage before it ever reaches the rated wattage.

Overload Voltage (Short-Time)
number · V
300

The 5 s short-time overload level per IEC 60115-1, typically 2-2.5x working voltage. Used to size inrush and hipot margin. Not the same field.

Number of Terminations
enum
4 (Kelvin)

2-terminal vs 4-terminal Kelvin. On a milliohm shunt, 2-terminal lead and solder resistance swamps the element and the measurement is wrong.

Lifecycle Status
enum
Active

Active / NRND / EOL / Obsolete. A 10-year industrial build will not design in an NRND part, and the rail must let them exclude it up front.

Compliance & identifiers

Standards, regulatory data, and the identifiers channels reject you for missing.

AEC-Q200 Qualified
boolean
true

A defined passive-component test flow with a report behind it, not a description word. Tier-1 automotive buyers filter on the boolean.

RoHS / REACH SVHC Status
enum
RoHS compliant; no SVHC > 0.1 % w/w

Required to sell into the EU and by most OEM supplier portals. Stated per part number with a dated declaration, not per series.

Country of Origin
identifier
TW

ISO 3166-1 alpha-2, per ECIA EIGP 114 labeling. Drives duty, tariff exposure and the traceability an authorized buyer expects.

The fields that aren't in the schema at all

What most resistors catalogs are missing.

The table above is the schema most catalogs already have. These are the attributes that usually aren't in it — each one surfaced by a signal from the live market rather than by an audit of what's already there. This is what Anglera's Schema Foundry does on a real catalog, in this category.

Competitor signal
+ Maximum Working Voltage

Mouser's resistor rail carries Voltage Rating as a facet; Digi-Key's chip-resistor filter set has none. In most catalogs the number lives only in the per-size table inside the series datasheet.

At 1 MΩ in an 0805 the voltage limit binds long before the wattage limit. Buyer sizes on power, part fails in a 250 V divider, the reel comes back.

Supplier signal
+ Pulse / Surge Withstanding Energy

Suppliers publish pulse capability as a single-pulse energy-vs-duration curve inside the PDF. Distributor rails offer at most a 'Pulse Withstanding' checkbox under Features, with no number behind it.

Surge series like Yageo SR or TE CRGP can't be compared against standard thick film. Inrush and ESD designs drop to RFQ or leave for a rail that answers.

Search signal
+ Sulfur Resistance (ASTM B809)

Vishay RCA-SR, KOA anti-sulfuration and Yageo AF are sold specifically as ASTM B809 parts. Buyers searching 'anti-sulfur resistor' land on free-text description copy, not a filter.

Silver terminations sulfurate and go open in the field. If the catalog can't separate the two series, the standard part ships into an HVAC or automotive board.

Supplier signal
+ Inductance (current sense)

Bourns CSS2H and CSI datasheets spec element inductance under 2 nH, and fast overcurrent designs choose on it. Almost no distributor resistor record carries an inductance field at all.

Low-inductance shunts look identical to ordinary milliohm parts on the rail. The buyer can't self-serve and goes to the manufacturer's own selector.

Marketplace signal
+ Orderable packaging variant

Reel size and termination code sit in the MPN suffix - Yageo's -07 vs -13 reel, trailing L for lead-free. Catalogs keyed on the base series number collapse both reels into one record.

A 5,000-pc 13 in reel ships against an order that wanted 1,000 on 7 in. MOQ disputes, restocking, and a broken Octopart offer where the offer is the packaged part.

How Schema Foundry finds these

Messy in, governed out.

The same value, spelled every way electronic components suppliers spell it. A filter only works once they agree.

Resistance
4K74.7k4700R4.7 kOhms4724700
4700 Ω

IEC 60062's 4K7, the 3-digit SMD code 472 and plain decimals all mean 4.7 kΩ. Only a numeric ohm value sorts and range-filters.

Package / Case
080520122012M0805MSMD08050805 (2012 Metric)
0805 (2012 Metric)

Imperial 0402 and metric 0402 are different parts - metric 0402 is imperial 01005. A bare code with no measurement system is unusable.

Power Rating
1/8W0.125 W125mW125 mW (1/8 W)0,125W1/8 watt
0.125 W

Fractional, milliwatt and comma-decimal spellings all arrive in the same feed. Range filters need one unit and one decimal mark.

Resistance Tolerance
F1%±1%1.0 %+/-10.01
±1 %

F is the IEC 60062 code for ±1 %; 0.01 is the same value as a fraction. Mixed forms split one tolerance into four facet buckets.

What buyers ask

Every one of these should be answerable from the attributes above. If it isn't, that's a gap.

  • Is this 0805 imperial or 0805 metric?
  • I'm nowhere near the wattage but I'm at 200 V - what's the actual voltage limit on this?
  • Is this reel 7 inch or 13 inch, and can I get cut tape for a 25-piece build?
  • Is this actually AEC-Q200 qualified, or just 'automotive grade' in the description?
  • Will this survive a sulfur atmosphere? The last one went open circuit after 18 months.
  • Is this 2-terminal or 4-terminal Kelvin? I need the sense lines off the current path.
  • What's the TCR? I need under 25 ppm/°C across -40 to +125 °C.
  • Is this still Active or is it NRND? This is a 10-year build.

What channels require

The same SKU, different mandatory fields per destination.

Octopart / Nexar (BOM search)
Manufacturer Part NumberManufacturer nameDatasheet URLPackaging (reel size / cut tape)Stock quantity and MOQPrice breaks
ECIA Authorized / TrustedParts
Manufacturer Part NumberManufacturer nameAuthorized-distributor statusCountry of Origin (ISO 3166-1 alpha-2)Lot / date code traceabilityStock quantity
Amazon Business
GTIN-13 / UPCBrandManufacturer Part NumberItem package quantityResistance, Tolerance, Power RatingRoHS declaration
Distributor's own parametric rail
ResistanceResistance TolerancePower RatingPackage / Case (with measurement system)CompositionTemperature Coefficient

Resistors data, in practice

Why does the same resistor value show up four different ways in our supplier feeds?

Because four marking standards coexist and all four are correct. IEC 60062's letter-and-digit code writes 4.7 kΩ as 4K7, putting the multiplier where the decimal point would be so it can't be lost in printing. The 3-digit SMD code writes it 472 - two significant digits plus a multiplier. EIA-96 marks 1% E96 parts with two digits and a letter that maps to neither. Then the datasheet table says 4.7 kΩ and the ERP says 4700. Normalizing to one numeric ohm value is what makes range filtering, duplicate detection and cross-supplier matching possible at all.

Is 0402 a size?

Not on its own. Imperial 0402 is 1.0 x 0.5 mm. Metric 0402 is 0.4 x 0.2 mm - which is imperial 01005, roughly a tenth of the area and a different placement process. Manufacturer datasheets written to IEC convention default to metric; US distributor rails default to imperial. Digi-Key resolves it by labeling the facet '0402 (1005 Metric)', carrying both systems in one governed value. A record that stores a bare four-digit code with no measurement system has already lost the information, and no downstream mapping recovers the original intent.

We size everything on wattage. Why carry maximum working voltage as its own field?

Because above a certain resistance the two limits cross. P = V²/R, so an 0805 rated 0.125 W only reaches its power limit at 250 V into 500 kΩ - but the part's maximum working voltage is 150 V. Past roughly 180 kΩ the voltage limit binds first, and every high-value part in the catalog is governed by a number the wattage filter never sees. Datasheets publish it per case size, usually one row in a table the parametric extractor skipped. Overload voltage is a second, higher number for short-time events (5 s per IEC 60115-1, typically 2-2.5x working voltage) - a different field, not a substitute.

Isn't 'automotive grade' in the description good enough instead of an AEC-Q200 flag?

No. AEC-Q200 is a defined qualification flow for passive components - thermal shock, biased humidity, operational life, board flex, ESD - with a test report behind it. A part has been through it or it hasn't. 'Automotive grade' is description copy a supplier can write about a part that never saw the flow. Tier-1 buyers filter on the boolean and ask for the report; they will not accept a string. Mouser exposes it as a facet on the resistor rail. If your rail can only answer it by full-text search, the automotive RFQ goes to one that answers yes or no.

More electronic components schemas

CapacitorsConnectorsRelaysSemiconductorsSensorsTerminal Blocks

Run this against your own resistors.

Bring the category. We'll show you which of these attributes your catalog is missing — and the ones we find that aren't on this page yet.

Book a demo