Diodes PCN-2824 EOL | Zetex-series 207 code, LTB expiration

Conclusion: PCN-2824 applies to order code 207; the final order deadline for LTB has passed

Last Updated: November 5, 2026 | Previous Update: October 20, 2026

Diodes Incorporated has announced the end-of-life (EOL) of Zetex-series discrete products via PCN-2824 (notification date: April 28, 2026; effective date: October 28, 2026). The table included in the PCN lists order code 207.The final order date for products covered by the Life Time Buy (LTB) program was October 28, 2026, and this deadline has passed. The final shipment date is April 28, 2027, and shipments are subject to availability.

Purchasing, Materials, and SCM personnel should verify these details against their company’s BOM, as well as check the remaining quantities and scheduled shipments for accepted orders, on-hand and in-channel inventory, and the status of alternative candidate evaluations.

Background: Basic Overview of PCN, EOL, and LTB

A PCN (Product Change Notification) is a formal notification issued by a manufacturer to customers when the manufacturer changes a product’s specifications, manufacturing location, or supply status. PCN-2824, in this case, specifically announces EOL (End of Life), which signifies the end of supply.The Zetex family consists of discrete products—such as bipolar transistors and MOSFETs—that have been used for many years in industrial equipment, telecommunications equipment, and consumer electronics. The older the design of a device, the more likely it is that the part number remains on its BOM.

LTB (Life Time Buy) is a program that allows customers to place a final bulk order before a product is discontinued. However, LTB is strictly a “last chance to order.”If the ordered quantity is either too large or too small relative to future demand, it will cause problems. If the quantity is too small, production will halt; if it is too large, you will be left with excess inventory, increasing the burden of storage and inventory valuation. Therefore, LTB should not be treated as a mere ordering task but rather as a decision-making process that combines demand forecasting with plans for design changes.

Verified Facts

• Notification Date: April 28, 2026
• Effective Date: October 28, 2026
• Scope: Order codes 207 listed in the PCN table
• Last Order Date for LTB-Subject Items: 2026-10-28 (Deadline Expired)
• Last Shipment Date for LTB-Eligible Items: April 28, 2027 (subject to availability)

Breakdown of the Four Tables

The total is 18 + 181 + 2 + 6 = 207. Based on the table’s classifications, there are 187 codes with LTB and 20 codes without LTB. The vast majority fall into the “with LTB” category (Table 2) without any alternatives.

When reading the table, special attention should be paid to the 20 codes without LTB (Table 1 and Table 3). These codes never had the option for LTB from the outset, and the final order deadline of October 28, 2026, does not apply to them. The status of currently accepted orders and remaining inventory must be confirmed individually with the manufacturer or distributor.Since Table 1 lists items with neither alternatives nor LTBs, if you are using any of these products, you should give top priority to considering a design change or switching to a competitor’s product. On the other hand, Table 3 lists recommended alternatives, providing a starting point for your evaluation.

Representative Affected Part Numbers

The representative part numbers listed in the PCN are as follows. Since there are other affected part numbers besides those listed here, be sure to check the official PCN table for the complete part numbers.

• Bipolar Transistors: FMMT411, FMMT411Q, FMMT413, ZTX415, ZTX555, ZTX600, ZTX694B
• MOSFET series: ZVN0545A, ZVN2106A, ZVN4306AV, ZVP0545G, ZVP4424G
• ZXM/ZXM Series: ZXM61N02F, ZXM61N03F, ZXMN3A14F, ZXMP6A13G, ZXMP10A18G

Differences in the suffix (e.g., TA, TC), package type, or packaging format result in these being treated as separate order codes. For example, even if the base part number is the same, the code may differ based on reel diameter.If you only manage basic part numbers in your BOM, it is easy to overlook which specific part number applies, so please verify using the complete part number actually used for ordering.

Manufacturer-Recommended Alternatives

Recommended alternatives are listed for the following eight pairs:

Items to Compare During Replacement Evaluation

Using MOSFETs as an example, comparing the following items side-by-side between the old and new parts during a replacement evaluation can help minimize errors.

• Absolute Maximum Ratings: Drain-to-source voltage, gate-to-source voltage, and continuous drain current. Verify that there is sufficient margin for the worst-case scenario in the circuit.
• Gate threshold voltage (VGS(th)): When driven by logic levels, verify that the device turns on sufficiently at the drive voltage.
• On-resistance (RDS(on)): Verify that the measurement conditions (gate voltage, current) match. This directly affects heat generation and efficiency.
• Capacitance and gate charge: These affect switching speed, the load on the drive circuit, and EMI.
• Package and Thermal Characteristics: Verify that the form factor, pinout, recommended land pattern, and thermal resistance are compatible with the existing PCB.
• Body diode characteristics: In circuits that utilize reverse current or backflow, also verify the forward voltage and reverse recovery characteristics.

For bipolar transistors, the primary comparison criteria are current gain (hFE), saturation voltage, collector current, and switching time. For parts for which no recommended alternatives are listed, you will need to search for pin-compatible products from other manufacturers that meet these conditions.

Impact on Procurement: Organize information by separating facts from projections

What Can Be Determined from the PCN

• The final order deadline for LTB-designated products was October 28, 2026, and has already passed.
• Final shipments will be made through April 28, 2027, but are subject to availability.
• Of the 207 part numbers, recommended replacements are available for 8; for the majority, no replacements have been provided.

What Has Not Been Confirmed at This Time

Since we have not verified inventory, pricing, or delivery times, we cannot make any definitive statements here. Trends in distribution inventory and market prices will also depend on future developments. Generally speaking, supply and demand for distribution inventory tend to fluctuate after an EOL notification, but trends for specific part numbers must be confirmed through actual inquiries.

Actions Purchasing Personnel Should Take

1. BOM Verification: Compare your company’s bill of materials with the 207 part numbers listed in the PCN, including suffixes.
2. Identify the Category: Verify which of Tables 1–4 the applicable part falls under. Parts without an LTB (Tables 1 and 3) have never been eligible for purchase. The “LTB Available” notation in the tables reflects the classification at the time of notification and does not imply that additional orders are currently being accepted.
3. Confirmation of Open Orders and Inventory: For orders accepted within the deadline, obtain written confirmation from the manufacturer or authorized distributor regarding remaining quantities, secured quantities, scheduled shipments, and applicable terms. Keep track of on-hand inventory and distribution channel inventory separately.
4. Estimating Supply Shortages: Compare future production plans, maintenance and repair demand, and safety stock with available inventory and projected shipments. The final shipment date of April 28, 2027, is “subject to availability” and does not guarantee shipment of the entire quantity.
5. Alternative Evaluation: For items with recommended alternatives, arrange evaluation samples; for items without alternatives, consider pin-compatible products from other manufacturers or design changes. Please establish a schedule for evaluation, internal approval, and transition, starting with items expected to be in short supply.
6. Sharing with Customers and the Quality Department: For certified products, change management and customer approval may take time.

Calculating Required Quantities and Projected Shortages (Hypothetical Example)

The following is a hypothetical example to illustrate the concept and does not represent actual figures. Assume that a certain product uses 2,000 units of the target MOSFET per month and that production is planned to continue for 24 months.Furthermore, if we estimate 1,000 units per year for maintenance and repair needs and two months’ worth as safety stock, the required quantities can be summarized as follows:

• Production: 2,000 units × 24 months = 48,000 units
• Maintenance: 1,000 units × 2 years = 2,000 units
• Safety stock: 2,000 units × 2 months = 4,000 units
• Total: 54,000 units

Determine the projected shortfall by comparing the required quantity with available on-hand inventory and the estimated shipment quantity for accepted orders. Items that have been ordered but for which acceptance, quantity confirmation, and shipment schedules have not yet been confirmed should be managed separately from secured quantities.Do not assume an additional LTB to cover shortages; instead, use this information to verify remaining inventory and develop a plan for transitioning to alternative products. Since the required quantity may vary depending on when the evaluation of alternatives is completed—for example, if a switch to an alternative is scheduled for 12 months from now—we recommend managing both factors on the same schedule.

Confirmation Procedure After the Final Order Deadline (Updated November 5, 2026)

The final order deadline of October 28, 2026, has passed. Going forward, please manage inventory and the transition to alternative products based on a review of actual orders and supply forecasts.

• Verification of Accepted Orders: For each complete order code, verify the accepted quantity, remaining unshipped quantity, secured quantity, scheduled shipment, and applicable conditions (such as NCNR) with the manufacturer or authorized distributor.
• Verification of Remaining Inventory: Verify on-hand and distribution inventory, checking lot numbers, date codes, traceability, storage conditions, quality, and return policies.
• Reconciliation with Demand: Reconcile production and maintenance demand with supply forecasts to identify when and in what quantities shortages are expected. Do not record unconfirmed distribution inventory or shipments as secured.
• Finalizing the transition to alternatives: For items expected to be in short supply, evaluate alternative candidates, obtain internal and customer approval, and finalize plans for design changes.

The end of the term does not mean that shipments of distribution inventory or accepted orders have uniformly ceased. However, we have not confirmed whether additional orders will be accepted after the term ends. Please confirm inventory, pricing, and actual shipment dates on a case-by-case basis by providing the complete part number and quantity.

Operational Best Practices

• For LTB items, record lot information, date codes, and packaging condition upon receipt, and manage them with the assumption of long-term storage.
• Provide a storage environment that accounts for humidity and temperature, and periodically verify the storage expiration dates as needed.
• The results of alternative evaluations should be documented as approval letters or change control records in preparation for future re-evaluations.
• If the same part is used in multiple products, aggregate demand across products and consolidate quantities to make a decision.

Practical Comments from AI Components

A key characteristic of this PCN is that the majority of items fall into the “No Substitute” or “LTB Available” categories. Now that the final order deadline has passed, it is necessary to determine the extent to which demand can be met by checking the outstanding order backlog, expected shipments, and remaining inventory for accepted orders, in parallel with the search for substitutes.

When searching for alternatives, even items with seemingly identical names may be evaluated differently due to differences in packaging or packaging units (e.g., -7, -13). It is crucial to verify the part number down to the very last digit. Distinguishing between the remaining quantities and shipment forecasts for accepted orders and the remaining inventory by procurement route provides additional information for decision-making.

Furthermore, when transitioning to substitute products, it is more practical to proceed in stages, starting with high-priority items, rather than switching all items at once. It is advisable to evaluate items with high usage volumes, those without substitutes, and those requiring customer approval first, while proceeding with the remainder in parallel.

Procurement Inquiries

Reference Information (Primary Information)

• Diodes Incorporated PCN-2824 REV 1 (April 28, 2026)
• Diodes Incorporated Product Change Notices

For a final determination, please be sure to refer to the latest version of the official PCN, which is the primary source of information.