535 Series Optocouplers for the galvanic separation of intrinsic safety (EXi) circuits, Isolation voltage min. 4kVDC, CTR min. 3.0, cutoff 2kHZ, ATEX & IECEx Certified (18 ATEX 0017 U, KIWA 18.009 U). Insulation resistance input /output up to 10^13 Ω. Distance between input and output for highest safety requirements up to 14.5mm. Galvanic separation and minor coupling capacitance between input and output circuit. Analog & digital signal transfer is possible. Minor output delay times compared to relays. Long life due to non mechanical wear. Magnetic fields do not impact operation. A photo-diode makes for very short cycle times. Able to invert the output signal during transfer.
Type of protection: II (1) G [Ex ia Ga] II C
In accordance with: EN 60079-0, EN 60079-11
ATEX Examination Certificate & Assessment Report
IECEx Certificate of Conformity
Mounting Instructions for 535 Optocoupler Series
| Isolation Voltage Input/Output Min. (VDC) | 4000 |
| Current Transfer Ratio lc/lf (lf = 10mA) Min. | 3 |
| Turn On/Off Time(µsec) | 19.5/212 |
| Collector-Emitter Voltage (VDC) Max. | 32 |
| Creeping Distance, Air Path I/O Min. (mm) | 14.5 |
| Ambient Temperature °C | -40 to 85 |
Any factory that requires high isolation and non-arcing environments, flammable gas processing plants, medical processing plants where ESD could be a real problem, mining operations
Series Data Sheet (PDF)| Item No. | Datasheet | Distributor | Region | Quantity | Cart | RFQ | Inventory Date |
|---|---|---|---|---|---|---|---|
| 535-04-0-I | MASTER/ONLINE | Americas | 0 | RFQ | 2025-04-18 | ||
| 535-04-0-I | Electro Sonic Group | Americas | 0 | RFQ | 2025-04-18 | ||
| 535-04-0-I | Digi-Key Electronics | Americas | 100 | BUY | RFQ | 2025-01-10 | |
| 535-04-0-I | Mouser Electronics | Americas | 0 | RFQ | 2025-04-18 | ||
| 535-04-0-I | Arrow Electronics | Americas | 100 | BUY | RFQ | 2025-04-18 | |
| 535-04-0-I | Standex Factory | Americas | 0 | RFQ | 2025-04-18 |
| Output/Isolation Voltage Input/Output Min. (VDC) | Turn On/Off Time (µsec) | Collector-Emitter (Forward Uf) Voltage Max. (VDC) | DC Forward Current If max. (mA) | Emitter/Collector Power Dissipation Ptot max. (mW) | Creeping Distance, Air Path I/O Min. (mm) | Current Transfer Ratio lc/lf (lf = 10mA) Min. (A) | Transmission Frequencies up to (KHz) | Special Feature |
|---|---|---|---|---|---|---|---|---|
| Clear | Clear | Clear | Clear | Clear | Clear | Clear | Clear | Clear |
521 Series Optocouplers for the galvanic separation of intrinsic safety circuits, Isolation voltage min. 6kVDC, CTR min. 0.5, cutoff 50kHZ. Insulation resistance input /output up to 10^13 Ω. Distance between input and output for highest safety requirements up to 24.5mm. Galvanic separation and minor coupling capacitance between input and output circuit. Analog & digital signal transfer is possible. Minor output delay times compared to relays. Long life due to non mechanical wear. Magnetic fields do not impact operation. A photo-diode makes for very short cycle times. Able to invert the output signal during transfer.
Miniature 522 Series Optocouplers for the galvanic separation of intrinsic safety (EXi) circuits, Isolation voltage min. 4kVDC, CTR min. 0.5, cutoff 85kHZ, ATEX & IECEx Certified (18 ATEX 0017 U, KIWA 18.009 U). Insulation resistance input /output up to 10^12 Ω. Distance between input and output for highest safety requirements up to 12mm. Galvanic separation and minor coupling capacitance between input and output circuit. Analog & digital signal transfer is possible. Minor output delay times compared to relays. Long life due to non mechanical wear. Magnetic fields do not impact operation. A photo-diode makes for very short cycle times. Able to invert the output signal during transfer.
Type of protection: II (1) G [Ex ia Ga] II C
In accordance with: EN 60079-0, EN 60079-11
ATEX Examination Certificate & Assessment Report
IECEx Certificate of Conformity
Mounting Instructions for 522 Optocoupler Series
525 Series Optocouplers for the galvanic separation of intrinsic safety (EXi) circuits, Isolation voltage min. 4kVDC, CTR min. 0.5, cutoff 50kHZ, ATEX & IECEx Certified (18 ATEX 0017 U, KIWA 18.009 U). Insulation resistance input /output up to 10^12 Ω. Distance between input and output for highest safety requirements up to 14.5mm. Galvanic separation and minor coupling capacitance between input and output circuit. Analog & digital signal transfer is possible. Minor output delay times compared to relays. Long life due to non mechanical wear. Magnetic fields do not impact operation. A photo-diode makes for very short cycle times. Able to invert the output signal during transfer.
Type of protection: II (1) G [Ex ia Ga] II C
In accordance with: EN 60079-0, EN 60079-11
ATEX Examination Certificate & Assessment Report
IECEx Certificate of Conformity
Mounting Instructions for 525 Optocoupler Series
528 Series Optocouplers for the galvanic separation of intrinsic safety circuits, Isolation voltage min. 10kVDC, CTR min. 0.9, cutoff 50kHZ. Insulation resistance input /output up to 10^12 Ω. Distance between input and output for highest safety requirements up to 42mm. Galvanic separation and minor coupling capacitance between input and output circuit. Analog & digital signal transfer is possible. Minor output delay times compared to relays. Long life due to non mechanical wear. Magnetic fields do not impact operation. A photo-diode makes for very short cycle times. Able to invert the output signal during transfer.
530-70 Series Optocouplers for the galvanic separation of intrinsic safety circuits, Isolation voltage min. 22kVDC, CTR min. 0.8%, cutoff 100kHZ. Insulation resistance input /output up to 10^12 Ω. Distance between input and output for highest safety requirements min. 39mm. Galvanic separation and minor coupling capacitance between input and output circuit. Analog & digital signal transfer is possible. Minor output delay times compared to relays. Long life due to non mechanical wear. Magnetic fields do not impact operation. A photo-diode makes for very short cycle times. Able to invert the output signal during transfer.
567 Series Optocouplers for the galvanic separation of intrinsic safety (EXi) circuits, Isolation voltage min. 4kVDC, cutoff 500kHZ, ATEX & IECEx Certified (18 ATEX 0017 U, KIWA 18.009 U). Insulation resistance input /output up to 10^13 Ω. Distance between input and output for highest safety requirements up to 14mm. Galvanic separation and minor coupling capacitance between input and output circuit. Analog & digital signal transfer is possible. Minor output delay times compared to relays. Long life due to non mechanical wear. Magnetic fields do not impact operation. A photo-diode makes for very short cycle times. Able to invert the output signal during transfer.
Type of protection: II (1) G [Ex ia Ga] II C
In accordance with: EN 60079-0, EN 60079-11
ATEX Examination Certificate & Assessment Report
IECEx Certificate of Conformity
Mounting Instructions for 567 Optocoupler Series
Welcome to Standex Electronics' RF Reed Relays Part I training module. Reed relays have long been known to have the capability to switch and carry RF signals and fast digital pulses. Hardly anyone thought reed relays were capable of switching and carrying RF up to 20 GHz, because the reed switch's leads are composed of nickel/iron which has a relatively high permeability or (MU). However, 20GHz is now a reality at Standex Electronics. We will be presenting the reasons Standex Electronics and their design team have made this possible.
Welcome to Standex Electronics' RF Reed Relays Part II training module. This second RF presentation assumes you have already heard the first Standex Electronics RF Part I presentation. Understanding the simple physical layout of a reed relay makes it easy to design and rest reed relays for RF and fast digital pulse applications. RF is dependent on the physical layout or signal path it takes while going through circuits and the components that make up those circuits. We will show you how the physical layout of the reed relay will have a direct bearing on the RF signal's success going into and out of the reed relay. Coupled with the relay's physical layout, the materials making up the reed relay are also important.
Welcome to Standex Electronics Reed Relay training module. This module will define key terms used in reed relays and their applications. The module will also describe the structure and function of reed relays and their vast number of applications.
Welcome to Standex Electronics where we will be exploring what magnets are and how they are used in the electronic industry. We will define the key terms relating to magnets and we will explore what magnets are, what they do, and how they are used.
Welcome to Standex Electronics' Latching and Form B Reed Relay and Sensor training module. This module will define key terms of Form B and Latching sensors and relays. The module will also describe the structure and function of latching and Form B reed relays and sensors.
® Copyright 2025 Standex Electronics, Inc. ® All Rights Reserved. A Standex International Corporation Company.
