Coto 9104 Series

  • Coto Technology

Product Features

  • Surface-mount high voltage SIP reed relay
  • Insulation resistance of 1011Ω minimum
  • Switching current 0.5A
  • Optional coil suppression diode
  • Magnetic shield
  • Temperature range −20°C to +85°C


  • Compliant

The 9104 surface-mount high voltage SIP reed relay series from Coto features available coil voltage options of 5VDC and 12VDC with a high switching voltage of 1000V and high dielectric strength of up to 3000VDC. The 9104 series adds high voltage switching capability and high voltage standoff capability to a SIP relay package. Moulded SIP relays are the industry standard when high reliability and consistent performance are desired in a compact package with a moulded thermostat body on integral lead frame design, hermetically sealed contacts for long life, magnetic shield and optional coil suppression diode which protects coil drive circuits. The 9104 series relays are ideally suited to the needs of automatic test equipment, instrumentation, battery management, solar and process control applications where voltage isolation is a key design requirement.

  • Surface-mount high voltage 4 pin SIP reed relay
  • Nominal coil voltage options of 5VDC and 12VDC
  • Contact form of 1A
  • High switching voltage of 1000V
  • High dielectric strength of up to 3000VDC
  • Contact rating 10W
  • Switching current 0.5A
  • High insulation resistance of 1011Ω minimum
  • Temperature range −20°C to +85°C
  • Moulded SIP package

Typical Applications include:

  • Automatic test equipment
  • Instrumentation
  • Battery management
  • Solar and process control applications

For further information regarding coil specifications, contact ratings and relay specifications please see the datasheet on the Technical Library tab.

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Weight 0.00000 kg
Dimensions 8.13 x 6.22 x 24.13mm
Coil Voltage


Contact Form

Contact Rating

Dielectric Strength

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Diode Option


Series / Model

Switching Voltage

RoHS Compliant Product – Coto

This product is available fully compliant to the RoHS EU directive 2011/65/EU.

Coto 9104 Series Technical Library

We are pleased to provide you with a range of additional content including videos, product datasheets, case studies, white papers and application notes for your reference. Please see below for the latest content available:



Coto 9104 reed relay series datasheet
Coto Technology sensors and switches product sheet
Coto RedRock™ TMR magnetic sensor product catalogue
Coto Technology reed relay and reed switch selector charts
CotoMOS® MOSFET relay selector chart
White Papers
Testing reed relays and reed switches for reliability white paper
Life expectancy for reed relays in high temperature environments white paper
Application Notes – TMR Sensors
The importance of magnet protection within harsh environments application note
Interfacing the Coto Technology RedRock™ RR110 to an ADC using a low power analog interface circuit application note
Ready for take-off using the RedRock™ RR130 in wildlife tracking devices application note
Size matters in capsule endoscopy application note
The evolution of magnetic sensing technology: from hall effect to tunneling magnetoresistance (TMR) application note
Using RedRock™ TMR magnetic sensors RR121 for speed and direction estimation in rotating systems application note
Improving a simple 3-wire level sensor assembly by using the RedRock™ RR131 TMR digital switch application note
Modernising security systems with TMR for higher reliability, wider sensing range and long battery life application note
How to replace a 2-wire reed switch with a 3-wire sensor application note
Application Notes – CotoMOS® MOSFETs
CotoMOS® technical and applications information application note
Applications of small signal relays in photovoltaic inverters application note
Increasing the ampacity of the CotoMOS® CS128 opto-isolated SSR by parallel operation application note
Output muting in headphone amplifiers and portable speakers with negligible harmonic distortion using CotoMOS® relays application note
Dual-rail battery switching using CotoMOS® relays in portable headphone amplifiers and portable powered speakers application note
RR110 ultra low power 'wake up' application note
How to increase your current capacity of 6-pin CotoMOS® solid state MOSFET relays by up to 100% application note
Application Notes – Classic Reed Relays
Reed relays technical and application information application note
Applications of small signal relays in photovoltaic inverters application note
If it ain't broke fix it application note
Leadform follows function in RF reed relay design application note
The heat is on when you test at 125°C (2970 Series) application note
Optimising cable tester switching architecture using the Coto Technology 9104-0022 high voltage reed relay application note
Best practices for applying Coto Technology's 9852 Form C reed relay application note
Coto Technology's 9814 reed relay application note
Application Notes – Classic Reed Switches
Reed switches technical and applications information application note
Reliable reed switching best practices for normally closed applications application note
Nobody said designing utility meters was easy application note
Rules of attraction for reliable reed switch-magnet applications application note
Liquid level sensing using reed switch technology application note
Liquid level sensing using reed switch technology application note (detailed)
The importance of magnet protection within harsh environments application note
Reed switch life characteristics under different levels of capacitive loading application note
Coto DYAD switch contact style application note
CT10-G4's rugged lead-frame design is a feature and a benefit application note




  • Coto Technology

Coto 9104 Series

Please be advised that due to the ongoing supply issues with raw materials affecting the global electronics industry, as well as an increase in orders received by our manufacturing partners, a large number of products are facing increased lead times in recent months. For the latest lead time and stock availability, please contact one of our engineers who will be happy to discuss lead times further and the potential for alternative parts.