EL817(C)

4N35 is onsemi’s single-channel phototransistor optocoupler in PDIP-6 — a GaAs infrared LED optically coupled to a silicon NPN phototransistor — for galvanic isolation between logic and high-voltage sides: MCU-to-mains interfaces, isolated feedback loops and PLC inputs. CTR is 100% minimum at IF = 10 mA / VCE = 10 V per the onsemi datasheet, with 5,000 Vrms input-output isolation and an 80 V BVCEO detector rating. Selection advice: CTR degrades with LED aging and temperature — design the LED drive current for end-of-life CTR (roughly half the datasheet minimum) rather than the headline number, or the isolated stage fails years into service. 4N36/4N37 are the same package with different CTR ranks; for faster edges use a logic-output optocoupler such as 6N137 instead of pushing a phototransistor coupler past ~10 kHz. Pin 6 exposes the phototransistor base — leave it unconnected unless you need the rarely used base-bias option. Active through distribution. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

PC817C is a transistor-output photocoupler (optocoupler) from Sharp in a DIP-4 package, with CTR 200%–400% (C rank) and 5 kV isolation — for galvanic isolation between control logic and power stages, PLC I/O and feedback loops. Its advantage is the C rank: the tightly specified current-transfer-ratio band makes the optocoupler gain predictable, which simplifies the feedback-loop design that loose-rank parts complicate. Selection advice: the C rank is the critical match point — A, B, C and D ranks have different CTR bands and are not interchangeable in tuned circuits, so quote the full PC817C code. Also available in SOP-4 for SMD assembly; confirm your package requirement. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

1ED020I12-F2 is an Infineon EiceDRIVER single-channel high-side IGBT gate driver in PG-DSO-16, tape and reel — 1200 V voltage class, ±2 A rail-to-rail output, coreless-transformer galvanic isolation, desaturation/short-circuit protection, active Miller clamp, active shutdown, UVLO on both supplies, 170 ns turn-on / 165 ns turn-off propagation delay, industrial qualified. The DESAT plus active Miller clamp combination is the selection point: a shorted IGBT is detected and shut down in hardware before the die fails, and the clamp holds the gate off against parasitic turn-on — a plain optocoupler gate drive provides neither. Selection advice: the full orderable code is 1ED020I12F2XUMA1 where XUMA1 denotes tape and reel (1,000 per reel); the 1ED020I12-B2 is the isolated variant in the same family and the 2ED020I12-F2 the dual-channel high-side version. Infineon lists this part Active, DigiKey lists the full code as in stock, and Infineon community support names it the recommended replacement for the discontinued 1ED020I12-FA. Evidence: the Infineon official datasheet Rev. 2.1 and product page confirm the ordering code, 1200 V class, ±2 A output, DSO-16 package and Active status. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

1EDN7511B is an Infineon EiceDRIVER single-channel low-side gate driver in PG-SOT23-6, tape and reel — for driving power MOSFETs from logic in compact SMPS stages. 4 A source / 8 A sink with 3.9 V UVLO is the selection point: asymmetric drive with logic-compatible turn-on threshold. Selection advice: the B suffix denotes the SOT-23-6 package — for the higher-UVLO variant suited to noisy rails, the 1EDN8511B is the sibling; the 4.2 V to 20 V range suits both 5 V and 12 V drive rails. Infineon lists this part as Active and preferred. Parameters verified against the Infineon official product page. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

1EDN8511B is an Infineon EiceDRIVER single-channel low-side gate driver in PG-SOT23-6, tape and reel — for driving power MOSFETs from logic in compact SMPS stages. 4 A source / 8 A sink with 7 V UVLO is the selection point: asymmetric drive with a higher turn-on threshold for noisy gate-drive rails. Selection advice: the B suffix denotes the SOT-23-6 package; the 8 V to 20 V range versus the 4.2 V to 20 V of the 1EDN7511B — pick this variant where a higher UVLO better rejects supply noise. Infineon lists this part as Active and preferred. Parameters verified against the Infineon official product page. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

23LC1024-I/P is a Microchip 1-Mbit SPI serial SRAM in 8-pin PDIP — for fast scratchpad memory: data buffering, display framebuffers and audio delay lines. Unlimited read/write endurance at up to 20 MHz SPI is the selection point: RAM speed with none of EEPROM's write-cycle limits. Selection advice: the I/P denotes PDIP-8 — the breadboard-friendly variant; for SMT, the SOIC variant is the pick. Volatile — for non-volatile needs, the 24LC EEPROM series is the sibling; for more speed, the SQI mode doubles throughput. Microchip lists this part as In Production. Parameters verified against the Microchip official product page. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

24LC256-I/P is a Microchip 256 Kbit I2C serial EEPROM in 8-pin PDIP — for non-volatile storage: configuration data, calibration tables and event logs. 256 Kbit with 1M erase/write cycles is the selection point: the workhorse EEPROM density for embedded designs. Selection advice: the I/P denotes PDIP-8 — the breadboard-friendly variant; for SMT, the SOIC variant is the pick. 64-byte page writes and 400 kHz bus cover most logging needs; for larger storage, step up the 24LC series density. Microchip lists this part as In Production. Parameters verified against the Microchip official product page. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

2EDF7235K is an Infineon EiceDRIVER dual-channel isolated gate driver — PG-TFLGA-13, functional galvanic isolation, tape and reel. The coreless-transformer isolation is the selection point: dual-channel isolated drive in a 5×5 mm package with no optocoupler aging — for SiC/GaN and IGBT stages. Selection advice: lifecycle warning — Infineon lists the 2EDF7235K as discontinued (EOL announced May 2023); for new designs migrate to the current-generation 2EDF7xxx family, and for repairs and legacy builds we source remaining stock. Confirm the exact 2EDF7235K code on the BOM — the EiceDRIVER family spans many current and package variants that are not interchangeable. Evidence: Infineon data confirms discontinued status and the base ordering code. Match the full 2EDF7235K code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

2EDF7275F is an Infineon EiceDRIVER dual-channel isolated half-bridge gate driver — PG-DSO-16, 4 A source / 8 A sink, functional galvanic isolation, UVLO 3.9 V/4.2 V, tape and reel. The 4 A/8 A asymmetric drive is the selection point: strong turn-off for fast switching in a standard DSO-16 — isolated drive without an optocoupler. Selection advice: lifecycle note — Infineon lists the 2EDF7275F as Not For New Design; for new designs specify the 2EDF7275K (the Active/preferred TFLGA-13 variant of the same die), and for existing production confirm the exact 2EDF7275F code — the K and F suffixes are different packages and are not interchangeable. Verify the functional (not reinforced) isolation rating against your safety standard. Evidence: Infineon data confirms NFND, DSO-16, 4 A/8 A, functional isolation, UVLO levels. Match the full 2EDF7275F code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

2EDF7275K is an Infineon EiceDRIVER dual-channel isolated half-bridge gate driver — PG-TFLGA-13 5×5 mm, 4 A source / 8 A sink, functional galvanic isolation, UVLO 3.9 V/4.2 V, tape and reel. The 4 A/8 A asymmetric drive is the selection point: strong turn-off for fast SiC/GaN and IGBT switching in a 5×5 mm package — isolated drive without an optocoupler. Selection advice: Infineon lists the 2EDF7275K as Active and preferred. The K suffix denotes the TFLGA-13 package — the same die ships in DSO-16 as the 2EDF7275F (Not For New Design), so match the package code to your footprint. Verify the functional (not reinforced) isolation rating against your safety standard. Evidence: Infineon data confirms Active/preferred, TFLGA-13, 4 A/8 A, functional isolation, UVLO levels. Match the full 2EDF7275K code. State quantity, packing and date-code requirements in your RFQ; we reconfirm the offered lot before quotation and reply within 24 hours.

EL817(C) is listed on the PC817 alternatives page as a pin-to-pin candidate (registry model EL817). Review that page’s checklist before substituting.