Availability status
Is the exact quantity finished and available now, incoming on an existing order, allocated, or waiting for production?
Electronic Component Buying Guide
Spot Stock vs Factory Lead Time vs Broker Stock
The terms do not describe the same thing. Spot stock describes near-term availability. Factory lead time estimates future production or replenishment. Broker stock describes an independent sourcing channel. A safe buying decision checks the channel, the actual lot, who controls it, and the order-specific ship date.
AvailabilityOn hand, incoming, or not yet built?
ChannelOCM, authorized, independent, or broker?
EvidenceWhat can be reviewed before release?
The 30-second answer
Do not compare these labels as if they were equal stock categories. Record availability, channel, physical control, and evidence as separate quote fields.
Spot stockAvailable now?
Potentially fast, but possession, lot details, reservation, and source status still need confirmation.
Factory lead timeBuilt later?
A planning estimate for supply that may not yet exist as finished, allocated product.
Broker stockFound where?
An independent route that may involve broker-owned inventory or a third-party upstream lot.
Start with the right question
One quote can belong to several categories
“Spot,” “factory,” and “broker” often appear in the same column, but they answer different questions. Separating them prevents a fast-looking quote from hiding an uncertain source or an unconfirmed delivery date.
Sourcing channel
Is the seller the original component manufacturer, authorized for this product, an independent stocking distributor, or a broker?
Physical control
Does the quoting supplier possess or control the lot, or is it still held by an upstream partner and subject to reconfirmation?
A broker may offer real spot stock. An authorized distributor may quote factory lead time. Record the channel and availability separately.
Direct comparison
How the three routes change delivery confidence and risk
This table is a starting point. The actual quote, source evidence, purchase terms, application risk, and accepted lot remain more important than the label.
| Comparison point | Spot stock | Factory lead time | Broker stock |
|---|---|---|---|
| What it describes | Near-term availability at current terms | Future production or replenishment timing | An independent or open-market sourcing channel |
| Typical delivery | Fast when real and reserved | After production and order processing | Fast if held; uncertain if still being located |
| Physical possession | Must be confirmed for the exact lot | Finished product may not yet exist | May be broker-owned or held upstream |
| Traceability | Ranges from full OCM pedigree to none | Usually strongest through OCM or authorized supply | Varies from documented OEM excess to unknown chain |
| Price behavior | Time-sensitive market price | Contract, quoted, or schedule-based | Market price plus possible scarcity and verification cost |
| Continuity | Usually limited to the visible lot | Can support planned releases after acceptance | Often limited or split across sources and lots |
| Main control | Verify location, lot, reservation, and ship date | Track accepted order status and current ESD | Assess source, chain of custody, inspection, testing, and terms |
Plain-language definitions
What each term should mean in a purchase decision
Spot stock
Inventory offered for immediate or near-term purchase. The term does not prove that the seller physically holds it, that it is authorized, or that it is reserved for you.
Ask before relying on it
- Where is the exact lot?
- Who owns or controls it?
- Is the quantity unallocated and reservable?
- When does the reservation expire?
Factory lead time
An estimate of how long new supply may take to build or replenish. It is not the same as on-hand stock, incoming inventory, or an accepted order’s current estimated ship date.
Ask before planning production
- What event starts the lead-time clock?
- Has the order been accepted?
- What is the current order-specific ESD?
- What can trigger rescheduling or NCNR terms?
Broker stock
Inventory offered through an independent broker or open-market source. It may be held by the broker, an OEM or EMS with excess, another distributor, or an upstream trader.
Ask before approving the source
- Is the lot broker-owned or broker-located?
- What chain-of-custody evidence exists?
- Can the lot be inspected before release?
- What happens if the source or lot changes?
Do not confuse a planning value with an order date
Factory lead time is not a delivery promise
A distributor’s on-hand stock, incoming quantity, manufacturer standard lead time, and accepted-order estimated ship date are different fields. DigiKey’s guidance separates current and incoming inventory from the manufacturer standard lead time. Texas Instruments also separates the average time quoted to build a part from the estimated ship date assigned after order acceptance.
On-hand quantityFinished inventory at the seller or stated warehouse. Confirm that it is unallocated and available to your buying entity.
Incoming stockProduct already on order with an expected receipt date. Confirm quantity, schedule line, and whether it is allocated.
Standard lead timeA planning estimate used when available and incoming inventory cannot cover the requirement.
Order-specific ESDThe current estimated ship date for an accepted order. It is more useful, but still subject to the supplier’s terms and rescheduling process.
Inventory listings need interpretation
Why “in stock” can still fail the production schedule
A listing is a search signal. A time-stamped, lot-specific reservation or accepted order is stronger commercial evidence.
Several brokers may be quoting one upstream source. Matching quantities, date codes, or photos can reveal that apparently separate offers are the same lot.
Inventory may already be sold, reserved, quarantined, returned, or allocated while public pages still display the old quantity.
A lot may be limited by region, contract, minimum release, export control, or another customer’s allocation.
Package, grade, packing, speed, finish, memory density, qualification, and revision can hide in the full ordering code. Compare the complete MPN character by character.
Authorized distribution is a source relationship, not a delivery speed. An authorized distributor can have spot stock, incoming stock, factory stock, or no stock at all.
Review the authorization criteria →
A practical reality check
How to verify that the quoted stock is real
The right control plan depends on the part, source, application, value, obsolescence, and consequence of failure. Every urgent quote still needs a basic commercial and quality check before payment or production planning.
01
Lock the exact identityOCM, complete MPN and suffix, package, grade, finish, packing method, and accepted alternatives.
02
Locate the physical lotWarehouse country, possession or control, quantity, reservation status, and whether the source is still upstream.
03
Review lot-specific evidenceCurrent labels, packaging, date and lot codes, condition, quantity, and documents tied to the exact offer.
04
Agree the release conditionsInspection, testing, sample basis, acceptance criteria, report, failure disposition, payment trigger, and return rights.
Choose by the buying situation
Which sourcing route should you review first?
Select a scenario to see a practical starting route. This is planning guidance, not a substitute for your engineering, quality, compliance, or program approval.
Bridge the gap without abandoning the authorized pipeline
Secure verified authorized spot stock first. If it cannot cover the immediate gap, review only the independent quantity needed to protect production, then keep the authorized backlog active for later releases.
First routeOCM or authorized on-hand stock
BackupRisk-controlled independent lot for the bridge quantity
Do not missReservation, evidence, inspection time, and lot-change prohibition
Use accepted factory supply for continuity
Compare on-hand and incoming authorized inventory before using standard lead time. For the uncovered balance, place the order with forecast, MOQ, SPQ, cancellation terms, and order-specific ESD visible.
First routeAuthorized stock, incoming, or accepted factory order
BackupSecond authorized source or approved alternate
Do not missCurrent ESD, reschedule notices, lifecycle, and safety stock
Control the exact lot and the lifetime need
Start with an authorized last-time buy, approved aftermarket route, or redesign check. If the open market is required, avoid counting repeated listings as separate supply and tie all approval evidence to one exact lot.
First routeAuthorized LTB, approved aftermarket source, or redesign
BackupQualified independent stock with risk-based review
Do not missStorage, date code, lot homogeneity, testing, and controlled lifetime quantity
Prefer known pedigree and formal risk approval
Use OCM or authorized traceable supply whenever available. A non-authorized source should enter the program only through documented engineering, quality, customer, and compliance approval with a part-specific risk plan.
First routeOCM or authorized traceable supply
Exception routeNon-authorized stock only under formal program approval
Do not missPedigree, applicable standards, qualification limits, and failure consequence
Price is only one line of the decision
Compare total acquisition risk
A low unit price can become expensive if the lot is late, fails inspection, creates rework, or stops production. Include freight, duty, inspection, laboratory testing, engineering review, receiving time, yield loss, warranty exposure, and schedule consequences.
For factory supply, plan from the accepted order and current ESD. For spot or broker stock, include the time needed to secure the lot, obtain evidence, inspect, test, release, and transport it.
Required order release date = need date − supply time − transport/customs − inspection/release − schedule bufferDefine every term with order-specific evidence. A website’s generic lead time is not enough.
A
Delivery confidenceReservation, accepted order, current ESD, partial delivery, and reschedule process.
B
Source confidenceAuthorization, physical control, chain of custody, lot consistency, and storage evidence.
C
Quality controlsInspection method, sample basis, laboratory scope, acceptance criteria, and failure disposition.
D
Commercial protectionQuote validity, payment trigger, warranty, rejection, return, NCNR, and lot-change terms.
Make the next quote comparable
What to include in a stock-status RFQ
Ask for the same fields from every supplier. Two quotes are not equivalent when one includes a reserved, traceable lot and the other includes only an upstream database result.
01 / IDENTITYExact componentOCM, full MPN and suffix, package, grade, finish, packing, approved alternatives.
02 / DEMANDQuantity and timingRequired quantity, split shipments, need date, destination, MOQ and SPQ limits.
03 / STOCKAvailability and controlOn hand, incoming, factory lead time, location, possession, allocation, and reservation expiry.
04 / SOURCEChannel statusOCM, authorized for this product, independent stocking distributor, or broker.
05 / LOTCondition and evidenceDate and lot code, photos, traceability, original or repacked condition, storage history.
06 / RELEASEInspection and termsMethods, sample basis, report, acceptance, payment, rejection, return, warranty, and source-change approval.
Buyer questions
Frequently asked questions
Is spot stock always in the supplier’s warehouse?
No. Some sellers use “spot stock” for inventory available through a partner or the open market. Confirm who possesses or controls the exact lot, where it is located, whether it is unallocated, and whether it can be reserved for your order.
Does factory lead time mean my order will ship on that date?
No. Standard factory lead time is normally a planning estimate. An order-specific estimated ship date after acceptance is more useful, but it can still change under the supplier’s terms. Track order acknowledgement, current ESD, reschedules, and actual shipment separately.
What is the difference between factory stock and factory lead time?
Factory stock is reported finished inventory at a manufacturer or supplier location. Factory lead time estimates how long production or replenishment may take when usable inventory is not available. Factory stock can still require reservation, transfer, export processing, and transit.
Is broker stock necessarily counterfeit?
No. It can be genuine OEM or EMS excess, distributor inventory, or another legitimate lot. Risk increases when authorization, traceability, storage history, or chain of custody is weak. Assess the exact source, lot evidence, inspection plan, application risk, and commercial protection instead of assuming authenticity or counterfeiting.
Can testing prove broker parts are authentic?
Testing can detect anomalies and reduce risk, but it does not create an unbroken chain of custody. The methods must fit the device and application, and a passing sample cannot guarantee every unit or every long-term reliability attribute. Known pedigree remains preferable when available.
What does “subject to prior sale” mean?
The inventory may be sold to another customer before you complete the transaction or receive a written reservation. Confirm the reservation deadline and the exact event—purchase order, payment, or supplier acknowledgement—that secures the lot.
Should I cancel a factory order after finding spot stock?
Not before reviewing future demand, cancellation terms, allocation, and continuity. Spot stock may solve only the current gap. A split strategy—verified immediate stock plus an active authorized backlog—often protects both the urgent build and later production.
Technical references
Sources behind the definitions and controls
Supplier language and contract terms differ. Use these references together with the current quotation, manufacturer data, applicable standards, and your own program requirements.
- DigiKey: Product Lead-Time — separates on-hand, incoming, and manufacturer standard lead-time information.
- Texas Instruments: Backlog Customer Onboarding — distinguishes lead time, ESD, requested date, rescheduled ESD, and shipment status.
- TrustedParts: What Is Authorized Distribution? — explains authorization scope, authorized sourcing, disclosure, and warranty support.
- SAE AS6496A — counterfeit mitigation requirements for authorized distribution.
- SAE AS6081A — counterfeit avoidance and risk-control practices for independent distribution.
- SAE AS6171A — risk-based inspection and testing requirements for parts with unknown chain of custody.
- NASA: Counterfeit Parts Awareness and Inspection — definitions for open-market, stocking-distributor, and broker-distributor routes.
- JPL Quality Clause QC136b — a current example of authorization disclosure, traceability, and added inspection requirements.
Continue the purchase review
Move from stock language to a controlled order
Stock-status review
Send the exact MPN, quantity, and need date
YURUNOX can organize the response around availability status, source basis, physical control, lot details, inspection scope, commercial terms, and delivery requirements for the actual offer.