{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"MAX5943AEEE","brand":"Analog Devices","brandSlug":"analog-devices","productSlug":"MAX5943AEEE","canonicalUrl":"https://icboms.com/analog-devices/MAX5943AEEE","factsUrl":"https://icboms.com/api/mcp/products/MAX5943AEEE","rawCanonicalId":null},"summary":{"shortDescription":"Maxim MAX5943AEEE N+1 ORing Controller, FireWire applications, 7.5V to 37V supply, 1.3 mA supply current, 340 ns turn-off delay, external N-channel FET, 16-QSOP, -40°C to 85°C.","salesMarkdown":"The Maxim MAX5943AEEE is an N+1 ORing controller designed specifically for FireWire (IEEE 1394) powered-device ports. It drives an external N-channel MOSFET to replace a Schottky diode in the power path, reducing forward drop and dissipation. The controller operates from a 7.5V to 37V supply, covering the FireWire 12V and 30V bus rails as well as industrial 24V systems. With no internal switch, the designer selects the external N-channel FET to match the load current and thermal budget. The 340 ns turn-off delay ensures fast disconnect when the input drops or a fault occurs, preventing reverse current from back-feeding the bus. Supply current is a low 1.3 mA, keeping overhead minimal in multi-port designs. ## 340 ns turn-off — why it matters for ORing In an ORing configuration, multiple power sources feed a common load. When one source fails short or drops out, the controller must disconnect that path before current reverses. The 340 ns turn-off delay means the external FET gate is pulled down within 340 ns of detecting the fault condition. This is fast enough to prevent significant reverse current on FireWire buses where cable inductance and load capacitance can otherwise cause shoot-through between ports. ## RoHS non-compliant — sourcing constraint The MAX5943AEEE is listed as RoHS non-compliant. This means it cannot be shipped into EU markets or any jurisdiction enforcing RoHS exemptions. Buyers should verify their end-market compliance before specifying this part. ## External N-channel FET — BOM planning Because the MAX5943AEEE has no internal switch, the bill of materials must include an external N-channel MOSFET plus gate-drive passives. The controller provides the gate drive and fault detection; the designer sizes the FET for the load current, RDS(on), and thermal dissipation. This gives flexibility in current rating — a 2 A port uses a small SOT-23 FET, while a 10 A port needs a DPAK or larger — but adds two to three components to the BOM versus a fully integrated ORing solution.","metaTitle":"MAX5943AEEE N+1 ORing Controller, 7.5V-37V, 340ns OFF","metaDescription":"Maxim MAX5943AEEE N+1 ORing Controller for FireWire, 7.5V to 37V supply, 340ns turn-off, external N-channel FET, -40°C to 85°C, 16-QSOP. RoHS non-compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"RoHS non-compliant","productStatus":"Active","categoryPath":["Discrete Semiconductors"],"specifications":{"Type":"N+1 ORing Controller","Package":"Bulk","FET Type":"N-Channel","Applications":"FireWire®","Mounting Type":"Surface Mount","Package / Case":"16-SSOP (0.154\\\", 3.90mm Width)","lifecycle_stage":"eol_hot","Current - Supply":"1.3 mA","Delay Time - OFF":"340 ns","Voltage - Supply":"7.5V ~ 37V","Internal Switch(s)":"No","Ratio - Input:Output":"N:1","Operating Temperature":"-40°C ~ 85°C (TA)","Supplier Device Package":"16-QSOP"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$2.0","priceTiers":[{"qty":139,"price":"$2.16000","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/bb82431728c273f8eb6160f5b0ba5927.pdf","sourceUrl":null,"alternativesUrl":"https://icboms.com/api/mcp/products/MAX5943AEEE/alternatives.json"},"ai":{"faq":[{"question":"What is an equivalent or replacement for MAX5943AEEE?","answer":"The MAX5943AEEE is a FireWire-specific N+1 ORing controller. Within the same function class, the Texas Instruments TPS2410 and Linear Technology LTC4355 are N+1 ORing controllers with similar supply ranges and external FET drive, but they are not pin-compatible and target different bus voltages. Verify pinout and timing before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/analog-devices/MAX5943AEEE","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/analog-devices/MAX5943AEEE when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:49:49.435Z","lastPublished":"2026-08-11T15:49:49.435Z","indexable":true}}