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Replacement of Mechanical Relays
Motor Control & Power Control
Aircraft Flight Control Systems
A.T.E (Automatic Test Equipment)
Load Control From Processor I/O Ports
Power Supply Circuits
Medical Electronics
Description:
The DIH-134 is a State-of-the-Art Photovoltaic Solid State Relay designed for 28V DC Aircraft power applications where
speed, current overload protection and immunity to transient voltages are critical.
The DIH-134 contains current limiting networks and thermally sensitive integrated circuits that disable the output, if the
output MOSFETs approach an unsafe operating temperature. Because the thermally sensitive integrated circuits have
built-in hysteresis, the output MOSFETs are automatically restarted when a safe temperature is reached. This auto restart
feature eliminates the need for system restart signals. If the overload condition continues to exist, the cycle is repeated; if
the overload condition is removed, the relay returns to normal operation.
The package contains two independent N/O relays, with separate LED inputs and optically isolated power MOSFET
outputs. Each relay, A or B, is capable of carrying 350mA DC continuous current and 500mA DC peak current. Each
LED optically couples to a Photovoltaic (PV) IC chip which responds by generating a voltage. This voltage is internally
connected to the Gate and Source terminals of the output MOSFETs, thus controlling their current. The DIH-134 is also
available screened to military specifications, as required.
Pin Designations
Relay A
Relay B
Input +
Input +
1
5
Input -
Input -
2
6
3
Output -
7
Output -
4
Output +
8
Output +
* DIH-134 Equivalent Circuit
100 Ohms
A-1 ; B-5
LED
Thermal
Sensor
*
Package Layout:
Weight 1.5 Grams
0.780 Max
.
0.120 Max
.
DIONICS INC
.
DIH-134
xxxx
A-3 ; B-7
0.040
0.270 Max.
PV
Rs
0.300 Min
.
NPN
A-2 ; B-6
Thermal Link
Enh.
0.020
A-4 ; B-8
0.100
0.046 Typ
.
0.010
02/2002
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