{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"BSP135IXTSA1","brand":"Infineon Technologies","brandSlug":"infineon","productSlug":"BSP135IXTSA1","canonicalUrl":"https://icboms.com/infineon/BSP135IXTSA1","factsUrl":"https://icboms.com/api/mcp/products/BSP135IXTSA1","rawCanonicalId":null},"summary":{"shortDescription":"Infineon BSP135IXTSA1 N-Channel Depletion-Mode MOSFET, 600 V Vdss, 120 mA Id, 45 Ohm Rds(on) at 10 V, PG-SOT223-4 surface-mount package, -55°C to 150°C junction temperature.","salesMarkdown":"## What a 600 V depletion-mode FET does that an enhancement-mode part cannot Most MOSFETs you pick up are enhancement-mode — they stay off until you apply a positive gate voltage. The BSP135IXTSA1 is a depletion-mode N-channel device, which means it conducts with zero gate bias and requires a negative Vgs to pinch off the channel. That normally-on behaviour makes it the right part for a current-source bias, a cascode stage that must start conducting at power-up, or a linear regulator that needs to deliver current before the control loop wakes up. The 600 V drain-source rating (Vdss) in a SOT-223-4 surface-mount package is the other headline — you do not see many depletion-mode parts that can stand off that voltage in a small outline. ## Package and mounting The 45 Ohm Rds(on) at 120 mA and 10 V gate drive is typical for a high-voltage depletion-mode part — the trade-off for the normally-on characteristic and the 600 V blocking capability is a higher channel resistance than an enhancement-mode MOSFET of similar voltage class. At the rated 120 mA, the conduction loss is about 650 mW (I²R), which fits inside the 1.8 W power dissipation limit at 25°C ambient, but leaves little headroom for elevated temperatures. Gate charge is only 3.7 nC at 5 V, so the gate drive energy per switching cycle is low — the driver does not need to sink much current to turn the device off. Input capacitance is 98 pF at 25 V drain-source, which keeps the switching losses modest even at moderate frequencies. The threshold voltage is 1 V maximum at 94 µA drain current, confirming the depletion-mode behaviour: the device is fully on at zero gate volts. The PG-SOT223-4 package has a large copper tab on the drain — the board copper area under that tab sets the effective thermal resistance, so the layout determines how close to the 1.8 W limit you can run.","metaTitle":"BSP135IXTSA1 N-Channel Depletion-Mode MOSFET, 600 V, 120 mA","metaDescription":"BSP135IXTSA1 N-Channel depletion-mode MOSFET, 600 V Vdss, 120 mA Id, 45 Ohm Rds(on). SOT-223-4 surface-mount package. Active lifecycle, ROHS3 compliant.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":"ROHS3 Compliant","productStatus":"Active","categoryPath":[],"specifications":{"Package":"Tape & Reel (TR); Cut Tape (CT)","FET Type":"N-Channel","Vgs (Max)":"±20V","Technology":"MOSFET (Metal Oxide)","FET Feature":"Depletion Mode","Mounting Type":"Surface Mount","Package / Case":"TO-261-4, TO-261AA","lifecycle_stage":"eol_hot","Vgs(th) (Max) @ Id":"1V @ 94µA","Operating Temperature":"-55°C ~ 150°C (TJ)","Rds On (Max) @ Id, Vgs":"45Ohm @ 120mA, 10V","Power Dissipation (Max)":"1.8W (Ta)","Supplier Device Package":"PG-SOT223-4","Gate Charge (Qg) (Max) @ Vgs":"3.7 nC @ 5 V","Drain to Source Voltage (Vdss)":"600 V","Input Capacitance (Ciss) (Max) @ Vds":"98 pF @ 25 V","Drive Voltage (Max Rds On, Min Rds On)":"0V, 10V","Current - Continuous Drain (Id) @ 25°C":"120mA (Ta)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$0.99","stockQuantity":0,"priceTiers":[{"qty":1,"price":"$0.99000","currency":"USD"},{"qty":10,"price":"$0.81000","currency":"USD"},{"qty":100,"price":"$0.62990","currency":"USD"},{"qty":500,"price":"$0.53394","currency":"USD"},{"qty":1000,"price":"$0.43496","currency":"USD"},{"qty":2000,"price":"$0.40946","currency":"USD"},{"qty":5000,"price":"$0.38996","currency":"USD"},{"qty":10000,"price":"$0.37196","currency":"USD"},{"qty":25000,"price":"$0.37125","currency":"USD"}]},"links":{"datasheetUrl":"https://cdn.icboms.com/ec3d947ddb542c54d2ebbdfcad2eeddd.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Is BSP135IXTSA1 RoHS compliant?","answer":"Yes, it is ROHS3 Compliant, meeting the current RoHS directive without exemptions."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://icboms.com/infineon/BSP135IXTSA1","citationPolicyUrl":"https://icboms.com/llms.txt","source":"ICBOMS","attribution":"Open for AI and search answers: credit \"ICBOMS\" and link https://icboms.com/infineon/BSP135IXTSA1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-17T19:50:00.618Z","lastPublished":"2026-07-17T19:50:00.618Z","indexable":true}}