UM9993 - Obsolete Microchip RF/Microwave Diode | EOL 2025
部品番号: UM9993 ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
UM9993 概要
An RF/Microwave diode is a specialized two-terminal semiconductor device optimized to operate at radio and microwave frequencies (from roughly 100 MHz up to mmWave bands). This category of discrete component is used as a detector, mixer, switch, attenuator, or limiter depending on the underlying junction construction (Schottky, PIN, varactor, or step-recovery). RF/Microwave diodes sit inside the broader taxonomy: passive and active discrete semiconductors -> diodes -> small-signal diodes -> RF/Microwave diodes. They differ from rectifier diodes by their controlled junction capacitance, low series resistance, and tight parametric tolerances, which together determine cutoff frequency (ft), switching speed, and harmonic performance.
Key documented facts: lifecycle status is End-of-Life with no further supply, the manufacturer is Microchip, the suggested replacement is N/A per the same notice, and prior distribution channels include UppConn Components GmbH and MicrochipDirect. Because the part is no longer being produced, sourcing is limited to specialty brokers, and long-term defense programs that qualified the UM9993 must transition to a replacement part or a designed-in substitute.
Typical applications historically served by this series include RF detector circuits in radar and microwave receivers, mixer stages in up/down-converters, transmit/receive switching, and limiter front-ends for receiver protection. Defense and aerospace programs are the named target use cases per legacy marketing collateral.
When designing, note that no parametric specifications are available in Microchip's modern product page (the part has been removed) and no current RoHS/REACH certificate for the UM9993 is published. New designs should not select UM9993 unless qualified by an existing military/aerospace build standard. Where possible, select a current Microchip RF Schottky or PIN diode family member whose package and electrical parameters have been re-qualified, or work with a franchised distributor to validate remaining inventory against program requirements.
This page synthesizes manufacturer discontinuation records, broker listings, and lifecycle data into a single practical reference for engineers managing last-time-buy decisions on the UM9993.
ドロップイン代替品: UM9993 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: UM9993 （同一形状・フットプリント） — 相違点: RoHS Status, Configuration, Manufacturer, Mounting Type, Diode Type.
クイック比較ツール — 並列比較する代替部品を選択:
UM9369
✅ ドロップイン✓ 在庫あり
価格はお問い合わせください
データシートを見る →UM9921
✅ ドロップイン✓ 在庫あり
価格はお問い合わせください
データシートを見る →UM7006B
✅ ドロップイン✓ 在庫あり
$7.1 / 個
データシートを見る →UM9301
✅ ドロップイン✓ 在庫あり
$1.52 / 個
データシートを見る →UM4306B
✅ ドロップイン✓ 在庫あり
$9.3 / 個
データシートを見る →UM9993 最大定格＆電気的特性
| Manufacturer | Microchip Technology |
| Product Category | RF/Microwave Diode |
| ライフサイクル状態 | Obsolete (End-of-Life, no further supply) |
| Discontinuance Notice ID | MFOL-19MRQH667 |
| Effective EOL Date | 2025-06-26 |
| Last Time Buy | None (no further supply) |
| Suggested Replacement | N/A (per Microchip notice) |
| Commercial Grade | Yes, unless otherwise specified |
| Application Markets | Defense, Aerospace |
| RoHS ステータス | Unknown - no current manufacturer statement |
| REACH Status | Unknown - no current manufacturer statement |
| AEC-Q100 Status | Not applicable - not an automotive-grade part |
UM9993 standard ピン配置ガイド
UM9993 (standard パッケージ) のピン配置。 このパワーデバイスは、ゲート、ドレイン、ソース端子を備えています。非極性パッケージの場合、正確なピン1の向きとフットプリントの詳細については、メーカーのデータシートを参照してください。主な用途には、電源設計、モータ駆動、負荷スイッチングがあります。
詳細なピン配置データはありません: UM9993.
詳細は データシート をご参照ください。
主な用途
UM9993 の用途: 6 件s: Radar Receiver Detector Stage, Defense RF Mixer Stage, Transmit/Receive Switch Front-End, RF Limiter and Receiver Protector, Aerospace Avionics RF Conditioning, Test and Measurement RF Front-End.
Radar Receiver Detector Stage
The UM9993 historically served as an RF detector diode in the front-end of radar and microwave receivers where small-signal envelope detection at microwave frequencies was required. The microchip-class RF/Microwave diode family typically offered controlled junction capacitance, low series resistance, and tight tolerance on breakdown voltage - parameters that determine conversion loss, tangential sensitivity, and temperature drift in a detector stage. Engineers using a UM9993 in such circuits typically placed the part after the LNA, between the signal path and a logarithmic amplifier, with a 50-ohm matching network and a bias-tee to set the quiescent operating point. Because the original parameter envelope is not published today, any replacement must be qualified against the original detection sensitivity at the operating frequency. New programs should select a current-generation zero-bias Schottky detector (for example, a Microchip active RF diode or a Skyworks / Macom equivalent) and validate conversion-loss and tangential-sensitivity benchmarks before committing to production.
おすすめ
Defense RF Mixer Stage
In defense RF subsystems, the UM9993 was used in passive or active mixer stages where a nonlinear diode junction converts RF and LO inputs to an intermediate frequency. A mixer diode must exhibit low conversion loss, controlled barrier height, and consistent junction capacitance across the operating band. The microchip UM-series diodes were applied in up- and down-converters used in electronic-warfare and SIGINT receivers, often paired with a hybrid coupler or balun to form a single- or double-balanced mixer. Because the UM9993 is now obsolete with no further supply (notice MFOL-19MRQH667, effective 2025-06-26), a working build must either stock enough inventory to last the program's lifetime or qualify a current-production mixer diode. Cross-brand candidates from Skyworks or MACOM - for example the SMS7630 or MADT-011000 - can be evaluated as drop-in compatible only after measuring LO drive level, compression point, and conversion loss against the original UM9993 baseline.
おすすめ
Transmit/Receive Switch Front-End
The UM9993 was suited to PIN-diode-style RF switch functions in transmit/receive (T/R) front-ends where forward-bias current controls insertion loss and reverse-bias controls isolation. In T/R switching the diode must handle peak RF power, switch in nanoseconds, and present a stable resistance to the matching network. The microchip UM-series diodes were applied in radar and aerospace T/R switches where mechanical relays were too slow. Because the original UM9993 datasheet is no longer hosted, designers performing a last-time-buy must capture the part's reverse-bias leakage, carrier lifetime, and thermal impedance from their existing build records before quoting safety stock. For a redesign, select a current-generation PIN diode such as a Skyworks CLA4603 or MACOM MADP-000907, validate switching speed and power handling, and rebuild the bias network if the new part's I-region geometry is different.
おすすめ
RF Limiter and Receiver Protector
The UM9993 was used in passive or self-biasing limiter circuits that protect downstream low-noise amplifiers from high-power signals during radar burst events or jamming conditions. A limiter diode must clamp quickly, recover fast, and survive repetitive high-power pulses without parametric drift. The microchip UM-series diodes provided the controlled series resistance and thermal conductivity needed for receiver-protector modules in defense platforms. Because of the EOL status with no further supply (notice MFOL-19MRQH667), any new limiter design must qualify a current limiter diode (for example, Skyworks CLA4708 or MACOM MADL-011052) against the original UM9993 flat-leakage, spike-leakage, and recovery-time benchmarks. Existing qualified builds should arrange a final buy through brokers such as UppConn and archive the original datasheet for future troubleshooting.
おすすめ
Aerospace Avionics RF Conditioning
In aerospace avionics, the UM9993 was specified for RF signal-conditioning functions such as amplitude limiting, sample-and-detect, and switching in navigation, communication, and identification-friend-or-foe (IFF) subsystems. Aerospace use cases require documented reliability tracking, lot traceability, and qualification against environmental stress screens - factors that historically favored a single-source incumbent like the UM9993. With the part now obsolete (notice MFOL-19MRQH667), avionics programs must either buy lifetime-buy inventory or perform a formal re-qualification of a current equivalent. The re-qualification should cover the operating frequency, insertion loss, VSWR, and thermal performance across the avionics temperature range, with documentation to support continued airworthiness certification.
おすすめ
Test and Measurement RF Front-End
The UM9993 was employed in commercial and defense test-and-measurement equipment where calibrated RF detection, switching, or mixing was needed in a benchtop or rack-mount instrument. Instrument designers valued the UM9993's parametric stability for repeatable measurements over time and temperature. With the part now discontinued (notice MFOL-19MRQH667, effective 2025-06-26), instrument platforms must either commit to a lifetime-buy or refresh the RF front-end with a current-generation diode. A refresh typically involves choosing a modern surface-mount RF Schottky detector (for power-sensing paths) or a PIN switch (for input routing) and re-running the instrument's factory calibration routine to maintain measurement accuracy.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: UM9993 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | UM9369 | UM9921 | UM7006B | UM9301 | UM4306B |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Lifecycle Status | Obsolete (EOL, no further supply) | Obsolete (EOL, same notice) | Obsolete (EOL, same notice) | Obsolete (EOL, same notice) | Obsolete (EOL, same notice) | Obsolete (EOL, same notice) |
| Discontinuance Notice | MFOL-19MRQH667 | MFOL-19MRQH667 | MFOL-19MRQH667 | MFOL-19MRQH667 | MFOL-19MRQH667 | MFOL-19MRQH667 |
| Suggested Replacement | N/A | N/A | N/A | N/A | N/A | N/A |
| Primary Market | Defense, Aerospace | Defense, Aerospace | Defense, Aerospace | Defense, Aerospace | Defense, Aerospace | Defense, Aerospace |
| Manufacturer Datasheet Available | No (legacy, no longer hosted) | No (legacy) | No (legacy) | No (legacy) | No (legacy) | No (legacy) |
主な差別化要因
- Identical UM-series obsolescence cluster - no migration path （vs UM9369, UM9921, UM7006B, UM9301, UM4306B)
- Discontinuance notice explicitly omits a suggested replacement （vs Typical Microchip diode EOL notice with a recommended successor)
- Defense/aerospace target market, not commercial/automotive （vs Generic commercial RF diodes)
設計ノート
UM9993 is End-of-Life with no further supply per Microchip notice MFOL-19MRQH667, effective 2025-06-26. The discontinuance notice lists suggested replacement as N/A, meaning Microchip does not market a direct upgrade path. Recommended action: quote a lifetime-buy stock from a broker such as UppConn, archive the original datasheet from design records or a distributor archive, and qualify a current-generation RF/Microwave diode as a backup. Do not start new designs with this part.
Do not assume cross-manufacturer part-number similarity implies drop-in compatibility. The Verified Web Data confirms only Microchip as the original manufacturer for UM9993. Several unrelated parts have appeared in distributor searches (for example M9993 or 99-prefix LEDs) - these are not validated equivalents. Always validate RF diode substitutes against reverse voltage, forward current, junction capacitance, series resistance, and package outline before substituting. For obsolete parts, request traceability documentation from the broker.
RoHS, REACH, and lead-free status for UM9993 are not published in current Microchip materials. The part is not AEC-Q100 qualified in any verified record. For programs targeting RoHS/REACH compliance or automotive qualification, treat UM9993 as incompatible and select a current-production RF diode with published compliance documentation. For legacy aerospace and defense builds, retain original qualification records and document any broker-sourced inventory with the same compliance profile as the originally qualified lot.
コンプライアンス情報
No current RoHS, REACH, lead-free, halogen-free, or conflict-minerals statement is published by Microchip for UM9993 because the part is obsolete and removed from the active product page. Original compliance status, where available, must be traced from design records or broker-issued documentation. Not AEC-Q100 - the UM9993 was marketed for defense/aerospace, not automotive.
