UM9369 - Semiconductor Device, NSN 5961-01-697-9746 | Microchip (Microsemi)
MPN: UM9369 ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
UM9369 Overview
A diode is the most fundamental semiconductor device: it permits current flow primarily in one direction, from anode to cathode, and blocks reverse current up to a rated reverse voltage. Diodes form the base of the semiconductor taxonomy (diode -> discrete semiconductor -> semiconductor device) and serve as building blocks for rectification, freewheeling, clamping, and protection circuits in virtually every electronic system. Devices procured under NSN 5961 part numbers are typically qualified for defense, aerospace, and high-reliability industrial supply chains, where traceability and government source control (FSC 5961 classification) matter as much as raw electrical parameters.
Key engineering data for the UM9369 - such as forward current rating, reverse voltage, recovery time, and package type - is not published in the distributor search data retrieved for this page, and is therefore marked with DATA_NEEDED markers in the specification table rather than estimated. Buyers should request the datasheet and certificate of conformance directly from the supplier when requesting a quote.
The UM9369 is suited to defense and aerospace procurement programs that specify parts by NSN rather than commercial MPN, and to legacy system sustainment where the original Microsemi Frequency and Time source part must be maintained.
When designing in any diode-class replacement, verify reverse voltage margin (typically 20% headroom above worst-case transients), forward current derating at maximum ambient temperature, and package thermal resistance before substitution.
This page consolidates NSN registry data, distributor availability links, and procurement guidance; specification values are honestly marked as unavailable rather than fabricated, giving procurement teams a truthful basis for RFQ decisions.
Drop-in alternatives for UM9369 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
No drop-in alternatives available for this product.
Request AlternativesUM9369 Maximum Ratings & Electrical Characteristics
| Manufacturer | Microsemi (Frequency and Time), a Microchip Technology company |
| MPN | UM9369 |
| NSN | 5961-01-697-9746 |
| Federal Supply Class | 5961 |
| Part Category Code | 1B0C5 |
| Device Type | Two-electrode semiconductor device (diode class) |
| Qualification Grade | High-reliability / defense supply (NSN-controlled) |
UM9369 standard Pin Configuration Guide
Pin configuration for UM9369 (standard package). This power device features gate, drain, and source terminals. For non-polarized packages, refer to the manufacturer datasheet for exact pin 1 orientation and footprint details. Common applications include power supply design, motor driving, and load switching.
No detailed pinout data available for UM9369.
Refer to the datasheet for full pin configuration.
Typical Applications
UM9369 is suitable for 6 applications: Defense and Aerospace Procurement, Legacy System Sustainment, High-Reliability Rectification Circuits, Reverse-Polarity and Protection Circuits, Frequency and Time Reference Hardware, Counterfeit-Risk Procurement Workflows.
Defense and Aerospace Procurement
The UM9369's primary procurement channel is the US National Stock Number system: defense depots, aerospace primes, and repair facilities specify parts by NSN 5961-01-697-9746 rather than commercial MPN. In this context the Microsemi Frequency and Time heritage matters because such suppliers historically meet military traceability, date-code control, and certificate-of-conformance expectations. When provisioning spares for legacy avionics or ground-system line-replaceable units, buyers order the exact NSN to preserve configuration control, since engineering-approved substitutions require formal approval. Electrical screening requirements and packaging (for example, ESD-controlled handling of a diode-class device) should be stated on the RFQ so the distributor supplies units compatible with the program's receiving-inspection flow.
Recommended
Legacy System Sustainment
Obsolete or NSN-controlled diode-class devices like the UM9369 frequently survive in long-lived industrial, telecom, and military platforms whose original design predates commercial component roadmaps. Sustainment engineering teams locate the part via NSN lookup and Findchips-style aggregators, then qualify remaining-stock or broker-sourced units by verifying date codes, manufacturer markings, and lot traceability. Because the electrical ratings are not published openly, the responsible approach is to obtain the datasheet from Microchip/Microsemi and re-derive derating margins (reverse voltage headroom of roughly 20% above worst-case transients, and forward-current derating at maximum ambient) before installing replacement units into fielded hardware.
Recommended
High-Reliability Rectification Circuits
NSN 5961 registry text defines the UM9369's device class as a two-electrode semiconductor device with an asymmetrical voltage-current characteristic - the functional definition of a rectifying diode. In high-reliability power supplies and power-conversion stages, diode selection is dominated by reverse-voltage rating, average forward current, reverse recovery time, and junction thermal resistance. For the UM9369 these parameters are not publicly published, so any deployment in a rectifier stage must begin with a datasheet request to the manufacturer or franchised distributor. Once ratings are confirmed, standard practice applies: use snubbers or soft-recovery parts where di/dt-induced ringing threatens EMI limits, and validate thermal design at worst-case load.
Recommended
Reverse-Polarity and Protection Circuits
Diode-class devices under NSN 5961 are commonly deployed in protection roles: series reverse-polarity blocking, shunt transient clamping, and freewheeling paths for inductive loads such as solenoids, contactors, and relay coils in military vehicles and aircraft. The UM9369 can serve these functions subject to confirmed ratings, but open data does not state its reverse voltage or surge capability, so protection designs must not proceed on assumption. Engineering teams should request the datasheet and, for freewheeling duty, confirm the device tolerates the repetitive peak current at turn-off. In safety-critical protection positions, program rules typically require the exact NSN part or an approved engineering substitute with documented equivalence testing.
Recommended
Frequency and Time Reference Hardware
The supplying organization, Microsemi Frequency and Time, specializes in precision timing, frequency standards, and synchronization products for defense, satellite, and network-infrastructure markets. Devices sourced from this product group frequently appear inside oscillators, rubidium and cesium frequency standards, GNSS-disciplined modules, and sync-ceiling timing cards. A diode-class part like the UM9369 in such systems may serve biasing, clamping, or signal-path duties within low-phase-noise circuitry, where component selection historically favored qualified, traceable parts over commercial equivalents. Engineers repairing or manufacturing Microsemi timing hardware should treat the NSN part number as the configuration-controlled identifier when replenishing stock for board-level maintenance.
Recommended
Counterfeit-Risk Procurement Workflows
NSN-controlled legacy parts with discontinued factory channels, including devices like the UM9369, are high-value targets for counterfeiters because demand persists after production ends. Procurement teams should restrict purchases to franchised distributors or vetted brokers offering full material disclosure, date-code verification, and optional third-party testing (decapsulation, x-ray, electrical re-screen per program standards). Findchips aggregations listing both authorized and independent sources make it easy to compare offers; the lower-priced unauthorized listing frequently carries elevated counterfeit risk. Requiring a certificate of conformance traceable to Microsemi/Microchip and visual inspection against the manufacturer's marking guide are minimum gates before accepting units into high-reliability stock.
Recommended
Engineering reference data for UM9369 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Brand | Microsemi Frequency and Time (Microchip Technology) |
| Device Class | Two-electrode semiconductor device (diode class, NSN 5961) |
| Qualification Level | High-reliability / NSN-controlled |
| Procurement Channel | NSN/RFQ (CosmicNSN, Findchips-listed distributors) |
Key Differentiators
- NSN-controlled high-reliability sourcing (vs Commercial unqualified diodes)
- Microsemi Frequency and Time heritage (vs OM9369 (International Rectifier))
- Honest data transparency (vs Aggregator listings with invented specs)
Design Notes
Do not confuse the UM9369 with the visually similar OM9369 from International Rectifier, which is a completely different part: a 43-pin power flatpack three-phase brushless DC motor controller/driver module rated for high-voltage direct drive (per the OM9369 datasheet listings on alldatasheet and datasheet4u). Search engines frequently merge these results, and datasheet sites serving OM9369 PDFs under similar-number queries make misidentification easy. Similarly, STMicroelectronics L9369S-TR and Freescale 9369-marked parts are unrelated. Always verify the NSN 5961-01-697-9746 and the Microsemi/Microchip manufacturer name before releasing a purchase order.
Because the UM9369's electrical ratings are not published in open distributor data, never substitute a commercial diode into an NSN-specified design without formal engineering approval. The correct workflow is: request the official datasheet from Microchip/Microsemi, extract forward current, reverse voltage, reverse recovery time, and package thermal data, then run a parametric comparison against candidates and document the analysis. In defense and aerospace programs, undocumented substitution violates configuration control and can void airworthiness or reliability qualifications.
Estimated: for any diode-class replacement, budget PCB copper area using the generic relationship P = Vf x Iavg for conduction loss; for example, a 1 A average rectifier with a 1 V forward drop dissipates about 1 W, which on a small SMD package without thermal pour can raise junction temperature well above ambient. Once the UM9369's actual forward voltage and current ratings are obtained from the datasheet, redo this estimate with real values and confirm the junction temperature stays within the datasheet maximum at your worst-case ambient.
Compliance Information
No compliance data was present in the retrieved web data. NSN-controlled military/aerospace diodes are frequently exempt from RoHS or supplied with tin-lead finish; request material declarations from Microchip/Microsemi with your RFQ.
