MGA-635P8-TR1G Is Obsolete: A Buyer’s Checklist for Remaining Stock and Alternate Qualification
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MGA-635P8-TR1G can still appear in legacy RF BOMs even though the original manufacturer’s discontinuance process has ended. The sourcing question is therefore not simply whether someone lists the part. A buyer has to connect a supplier’s claim to a defined physical lot, while engineering decides whether that lot is only a bridge or whether the design should move to a qualified current-lifecycle device.
Short answer: Broadcom’s Product Obsolescence Notification OBS120117WSD3, issued on December 1, 2017, lists the exact orderable part number MGA-635P8-TR1G as item 804. The notice accepted last-time-buy orders through June 1, 2018, and the target item was in the group with final deliveries extended through June 1, 2019. Its recommended-replacement field is “None.” Any remaining-stock offer now needs lot-specific evidence, and any proposed alternate still requires engineering qualification.
Important: This guide does not confirm any seller’s current inventory, price, lead time, authorization or delivery capability. Those facts must be checked for a specific quotation and physical lot before an order is approved.
Confirm the Exact Orderable Part Number
The base device is MGA-635P8, an Avago Technologies GaAs MMIC low-noise amplifier. The complete orderable number matters because the suffix identifies the purchasing form. According to the original Avago MGA-635P8 data sheet, MGA-635P8-TR1G is supplied as 3,000 devices on a 7-inch reel.
Before evaluating a quotation, make sure the BOM, RFQ, supplier quote, packaging labels and purchase order all use the same complete number: MGA-635P8-TR1G. Do not silently shorten it to MGA-635P8 when packaging, reel quantity or incoming inspection requirements depend on the suffix.
| Identity field | Verified value | Why it matters |
|---|---|---|
| Base device | MGA-635P8 | Identifies the amplifier family and data sheet |
| Orderable MPN | MGA-635P8-TR1G | Matches the exact reel ordering option and obsolescence-notice row |
| Original manufacturer | Avago Technologies, now Broadcom | Controls the primary technical and lifecycle evidence |
| Ordering format | 3,000 devices per 7-inch reel | Supports quote, packaging and receiving checks |
What the Broadcom Obsolescence Notice Proves
The manufacturer-issued Broadcom Product Obsolescence Notification OBS120117WSD3 provides the lifecycle evidence for the exact MPN:
- Issue date: December 1, 2017
- Notice item: 804
- Orderable part: MGA-635P8-TR1G
- Product type in the notice: Standard product
- Last-time-buy orders accepted through: June 1, 2018
- Final delivery for the target item’s group: June 1, 2019
- Recommended replacement part in that notice: None
These dates show that the manufacturer’s stated last-time-buy window is closed. They do not prove that every unit outside the authorized channel is unusable, and they do not confirm that a particular supplier controls stock today. They also do not mean that engineering can never identify a suitable candidate. “None” means that Broadcom did not provide a recommended replacement in this notice.
For a broader decision between bridge stock, alternate qualification and redesign, use our EOL component decision framework.
What the Original Data Sheet Says
The data sheet describes MGA-635P8 as a 2.3–4.0 GHz ultra-low-noise, high-linearity amplifier built with 0.25 µm GaAs enhancement-mode pHEMT technology. It uses a 2.0 × 2.0 × 0.75 mm 8-pin QFN / SLP2X2 package with an exposed ground pad.
The following values are data-sheet characteristics at 2.5 GHz, Vdd = 5 V and Rbias = 3.6 kΩ. Typical values are not guaranteed minimums, and absolute maximum ratings are not normal operating targets.
| Parameter | Minimum | Typical | Maximum |
|---|---|---|---|
| Drain current | 46 mA | 56 mA | 71 mA |
| Gain | 16.5 dB | 18 dB | 19.5 dB |
| Noise figure | — | 0.56 dB | 0.78 dB |
| OIP3 | 32.5 dBm | 35.9 dBm | — |
| Output P1dB | — | 22 dBm | — |
Pin 1 is Vbias, pin 2 is the RF input and pin 7 is RF output / Vdd. The exposed center pad is ground, and the data sheet directs the user to ground unused pins. A candidate with a similar headline frequency or package still cannot be treated as a drop-in replacement without checking the complete pinout, land pattern, bias network, matching, stability and system performance.
How to Review a Supplier’s Remaining-Stock Claim
For an obsolete component, “in stock” can refer to manufacturer inventory, an authorized distributor’s remaining stock, independent-distributor inventory, a broker listing, material controlled by another party, or a database record that has not been reconciled to a physical lot. Ask what the claim means before comparing quantities or prices.
| Supplier claim | Evidence to request | What the evidence does not prove by itself |
|---|---|---|
| “We have stock” | Current quantity, stock location, ownership or control status, timestamped uncropped photos, and packaging identifiers tied to the quote | That the database quantity is physically available, allocable and ready to ship |
| “Original reel” | Outer and inner labels, reel condition, seals, moisture-barrier packaging where applicable, and disclosure of split-reel or repacking activity | Authenticity, storage history or an unbroken chain of custody |
| “Traceable” | A written definition of where the documented chain starts and ends, plus records that connect the quoted lot to that chain | Manufacturer authorization or warranty coverage unless those are verified separately |
| “New and original” | Written condition disclosure, source category, lot/date-code schedule and any repacking, programming, reclamation or refurbishment history | Authenticity merely because the statement appears on a quote |
| “Tested” | Laboratory identity, methods, sample size, acceptance criteria, raw observations, report date and exact lot identifiers | Attributes outside the test scope, every unit in the lot or missing ownership history |
| “Authorized source” | Current manufacturer directory evidence for the legal entity, region and relevant product line | Authorization based only on a logo, historical relationship or supplier statement |
A useful pre-shipment evidence set should connect the same MPN, quantity, packaging, lot/date codes and location across the quote, photographs, labels, traceability records and inspection plan. If those identifiers do not reconcile, pause the purchase instead of combining unrelated evidence into one approval package.
Date Code Is a Review Input, Not a Pass-or-Fail Rule
Older date code does not automatically mean unusable material, and a recent-looking code does not prove acceptable condition. For an obsolete RF component, the buyer should review the actual lot’s packaging and storage history together with the application and assembly process.
Ask for:
- Lot and date codes by quantity, including disclosure of mixed lots
- Photos that connect those codes to the reel, bag, box and quoted quantity
- Storage location and available environmental records
- Moisture-barrier bag, seal, desiccant and humidity-indicator condition where applicable
- Disclosure of repacking, split reels or relabeling
- A risk-based plan for solderability, package condition or other receiving checks when the storage history is incomplete
Marking is one cross-check, not a standalone authenticity test. The data sheet shows a 35X top-mark format, with X used as a month code, but a matching mark cannot establish origin, storage condition or electrical performance by itself.
Connect Traceability Records to the Physical Lot
A Certificate of Conformance, label photo, invoice or inspection report answers a different question. The approval package becomes useful only when those records can be tied to the same physical material.
- Define the claimed chain. State whether records reach only the direct seller, an upstream independent source, an authorized distributor or the original manufacturer.
- Reconcile identifiers. Compare the manufacturer name, full MPN, quantity, lot/date codes, reel or package identifiers and transaction dates.
- Separate source status from condition. Traceability does not automatically prove authorization, and authorization does not replace an inspection of material condition.
- Keep gaps visible. Redactions may be commercially necessary, but the buyer should understand which links in the chain remain unverified.
- Make acceptance conditional. Put document, inspection, testing, hold and return requirements into the quotation and purchase order before shipment.
Use our electronic component traceability checklist to define the required records and receiving controls before placing the order.
Inspection and Testing Have Limits
Inspection should be designed by the buyer’s quality and engineering teams for the source risk, component type and consequence of failure. Depending on the case, the plan may include packaging and label review, visual inspection, dimensions, X-ray or XRF, solderability, electrical checks, RF functional testing or destructive analysis. Not every method is necessary for every purchase.
The plan should specify:
- The physical lot and quantity covered
- How samples are selected and how many are tested
- The laboratory, equipment and methods
- Data-sheet limits or approved engineering criteria
- Acceptance, rejection and escalation rules
- How tested samples and the remaining material stay linked
A passing sample does not recreate missing chain of custody, guarantee every unit or validate parameters that were not tested. For an RF LNA, bench results also depend on fixture design, calibration, biasing, matching network, frequency and temperature. Record those conditions before comparing the legacy part with a candidate.
Alternate Qualification, Not Cross-Reference Shopping
Broadcom’s notice does not name a recommended replacement for MGA-635P8-TR1G. A distributor’s “similar” result may help start a search, but it is not an engineering approval. Even candidates in the same package or frequency class may require a new matching network, bias changes, layout work or a board redesign.
| Qualification area | Compare against the actual design | Failure mode if skipped |
|---|---|---|
| Lifecycle and supply | Current manufacturer status, support horizon, authorized channel and lot continuity | Replacing one obsolete dependency with another weak supply path |
| Frequency coverage | Required band, gain flatness and performance at every operating frequency | A candidate meets one test point but misses part of the system band |
| Noise performance | Noise figure under the intended bias, matching and temperature conditions | Receiver sensitivity or cascade noise performance degrades |
| Gain and linearity | Gain, P1dB, OIP3 and required margins across operating conditions | Compression, distortion or downstream level changes |
| Bias and power | Supply voltage, current, bias control, startup and dissipation | Incorrect operating point, thermal stress or power-budget failure |
| RF matching and stability | S-parameters, source/load match, stability and passive-component changes | Oscillation, poor return loss or unexpected gain response |
| Package and pinout | Body size, height, footprint, pin functions, exposed pad and orientation | Assembly incompatibility or incorrect PCB connections |
| Thermal and environment | Operating range, junction limits, board thermal path and application corners | Performance drift or reliability risk outside room-temperature testing |
| Assembly and compliance | Reflow, moisture handling, material declarations and application-specific requirements | Manufacturing defects or compliance gaps |
| System validation | Bench tests, prototype build, corner testing, EMC impact and formal change approval | A component-level match fails in the finished product |
The minimum practical sequence is:
- Freeze the real circuit and system requirements rather than copying only headline data-sheet values.
- Screen current-lifecycle candidates and document every unknown.
- Review the schematic, footprint, layout, grounding, bias and matching network.
- Simulate where useful, then bench-test samples using documented fixtures and conditions.
- Build prototypes and test the operating band, temperature and system corners that matter.
- Complete ECO, AVL, quality, regulatory and customer approvals required for the product.
- Set the cut-in plan and keep any bridge-stock decision tied to that schedule.
Do not let a quotation silently approve an alternate. Procurement can collect candidates and supply evidence, but engineering and quality must approve technical suitability and the validation plan.
MGA-635P8-TR1G RFQ Checklist
Send enough information for the supplier to answer the real sourcing question:
- Exact MPN: MGA-635P8-TR1G
- Required quantity, acceptable split shipments and delivery destination
- Required date and production or service horizon
- Whether a specific lot/date code is required and the technical reason
- Packaging condition and whether split reels or repacking are acceptable
- Required source disclosure and traceability depth
- Pre-shipment photos, label data and lot/quantity schedule
- Inspection or test methods, sample plan and acceptance criteria
- Commercial terms, including MOQ/MPQ, NCNR, warranty, hold and return conditions
- Whether the supplier may suggest alternate candidates for engineering review
When several quotes arrive, use the same fields for every supplier. Our electronic component quote comparison checklist helps prevent a low unit price from hiding differences in packaging, evidence, testing, lead time or commercial risk.
Practical Decision: Bridge Stock or Design Change?
Remaining stock may be appropriate when the physical lot and evidence pass review, the quantity covers a defined short-term need, and engineering already has a transition plan. It becomes a weak strategy when the source cannot be reconciled to a lot, the support horizon is long, qualification has not started, or repeated spot purchases would expose production to changing material and documentation.
For a new design, start with a current-lifecycle component selected for the actual RF and system requirements. For an existing design, treat any remaining MGA-635P8-TR1G inventory as a finite bridge whose acceptance depends on the specific lot—not as proof that the original product lifecycle has restarted.
If you need a quotation or document review, send the required quantity, destination, date-code or lot constraints, and traceability/testing requirements through the MGA-635P8-TR1G product page. Current availability, price, lead time and lot evidence must be confirmed for the specific request.
Frequently Asked Questions
Is MGA-635P8-TR1G obsolete?
Yes. Broadcom’s Product Obsolescence Notification OBS120117WSD3 lists the exact MPN as item 804. The notice was issued on December 1, 2017.
Is the last-time-buy window still open?
No. The notice accepted last-time-buy orders through June 1, 2018. The target item was in the group with final deliveries extended through June 1, 2019.
Did Broadcom name a replacement?
No replacement is listed in that notice; its recommended-replacement field is “None.” This does not make a third-party cross-reference automatically valid or prove that engineering cannot qualify a candidate.
Does an online stock number prove availability?
No. Confirm the quantity, physical location, ownership or control, packaging, lot/date codes and evidence date for the material connected to the actual quotation.
Can a photo or CoC prove authenticity?
Not by itself. Each item supports part of the review, but the buyer still needs to reconcile the physical lot, source claim, records, inspection scope and commercial terms.
Is an old date code automatically unusable?
No. Review the actual packaging, storage history, condition, assembly requirements and risk-based inspection or testing plan. Date code alone is not a universal acceptance or rejection rule.
Can a similar LNA be used as a drop-in replacement?
Not without engineering qualification. Frequency, gain and package similarity are insufficient; the review must also cover bias, current, noise, linearity, matching, stability, pinout, footprint, thermal behavior, assembly and system validation.
Source Notes
- Broadcom Product Obsolescence Notification OBS120117WSD3 — manufacturer-issued lifecycle notice, hosted mirror
- Avago MGA-635P8 Ultra Low Noise, High Linearity Low Noise Amplifier Data Sheet — manufacturer-authored data sheet, hosted mirror
- Avago Technologies product announcement, August 19, 2010 — historical manufacturer context; not evidence of current price or availability