The Pickering Series 101 is a range of CMOS drive SIL/SIP reed relays designed for direct interface with 74HC or HCT logic. The 101-2-A-24/2D is a two-form-A relay with a 24 V coil and internal diode, featuring a low-level dry contact (switch no. 2). It uses a plastic package with an internal mu-metal screen, allowing side-by-side mounting on 0.3 inch pitch. The switch supports up to 2 A at 50 W, with 10^8 operations life, 1.0 ms operate time, and 0.75 ms release time. Contact resistance is 0.15 Ω, insulation resistance exceeds 10^12 Ω, and open-switch capacitance is 0.1 pF. The coil resistance is 3000 Ω. Dimensions are 20.1 mm × 12.5 mm × 3.3 mm.
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-24/2D |
| Product Name | Series 101 |
| Relay Type | General; Reed Relay |
| Mounting | PCBoard |
| Poles | Double Pole (DP) |
| Throw | Single Throw |
| NO | 1 |
