The Series 101 is a family of CMOS drive SIL/SIP reed relays designed for direct drive from 74HC or HCT logic, available in 1 Form A, 1 Form B, 2 Form A, and 1 Form C configurations. The 101-2-A-24/1 is a two-pole normally open (2 Form A) relay with a 24V coil, featuring a plastic encapsulated package with internal mu-metal magnetic shielding to allow stacking on 0.3 inch (7.6 mm) pitch without magnetic interference. It has a maximum switching rating of 2 A at 50 W for dry contacts, with a typical coil resistance of 6000 Ω and an operate time of 1.0 ms. The relay supports dry switch types with insulation resistance greater than 10ⁱ Ω and contact capacitance of 2.5 pF across open contacts. It is tested for dynamic contact resistance and is suitable for applications requiring high isolation and low contact resistance without external drivers.
The Series 101 have very high coil resistances. 5 Volt dry versions may be driven directly from 74HC or 74HCT logic without the need for additional drivers.
74HC logic will drive up to 4mA at 5 Volts, therefore a coil resistance of 1600 ohms is desirable to avoid running the IC at its maximum rating; 1600 ohms is the coil resistance of the single pole dry Series 101. They may be stacked on 0.3 inches pitch (7.6mm) and as they have an internal mu-metal magnetic screen, there is no risk of magnetic interaction problems.
Both dry and mercury wetted switches are available in a range of confi gurations and coil voltages. The switches in the 2 Form A version are vertically stacked so the relay requires the same board area as the 1 Form A type.
A special 1 Form A, 5 Volt version is available with an even higher coil resistance of 3000 ohms. This is particularly suited to applications such as battery powered portable equipment as it requires a coil current of only 1.7 mA. This part, the 101-1-A-5/17 or 17D has the advantage of a lower level of thermal EMF of 3 microvolts or less.
Other special parts are also available that may be operated from 3 Volt logic.
| Pickering Electronics | |
|---|---|
| Product Category | Electromechanical Relays |
| Product Number | 101-2-A-24/1 |
| Product Name | Series 101 |
| Relay Type | General; Reed Relay |
| Mounting | PCBoard |
| Poles | Double Pole (DP) |
| Throw | Single Throw |
| NO | 1 |
