Series SR75-1
1.5A, 60Vdc Optically Isolated, Short-Circuit Protected
DC Solid-State Relay
Part Number* Relay Description
SR75-1
Solid-State Relay with Terminals for Through-Hole
mount
SR75-1S
*
Solid-State Relay with Terminals for Surface Mount
A ‘W’ or ‘T’ suffix denoting the
Teledyne reliability screening level,
must be added to the part number.
FEATURES/BENEFITS
ELECTRICAL SPECIFICATIONS
(-55°C TO 105°C, Ambient Temperature Unless Otherwise Specified)
INPUT (CONTROL) SPECIFICATIONS
Min
Control Voltage Range (See Note 2)
Input Current @ 5 Vdc (See Figure 1)
Must Turn-On Voltage (See Note 3)
Must Turn-Off Voltage
Reverse Voltage Protection
OUTPUT (LOAD) SPECIFICATION
Max Units
32.0
11.0
Vdc
mA
Vdc
1.5
-32.0
Vdc
Vdc
3.8
3.8
• Short-Circuit Protected: Prevents
damage to system components,
assemblies and system wiring
• Optical Isolation: Isolates control
circuits from load transients
Eliminates ground loops and signal
ground noise
• Low Off-State Leakage: For high off-
state impedance
• Switches High Currents: To 1.5 Adc
• High Noise Immunity: Control signals
isolated from switching noise
• High Dielectric Strength: For safety
and for protection of control and signal
level circuits
DESCRIPTION
The SR75-1 solid-state relay utilizes a
power FET switch that is protected
against short-circuit and overload
currents. The short-circuit protection
feature not only provides protection
should a short or overload occur while
the relay is on, but will also provide
protection should the relay be switched
into a short. In either case, the relay will
sense the short-circuit condition and
then block it indefinitely until the short is
removed and the unit is reset by cycling
the input control. Using the SR75-1 to
switch power sources and loads can
prevent fires, damage to system
assemblies and system wiring. The
power FET output offers low “ON”
resistance and can switch loads in either
the high or the low side of the power
line. The SR75-1 is packaged in a 16-pin
DIP package with either surface-mount
or through-hole mounting available.
Min
Load Voltage Rating
Transient Blocking Voltage
Output Current Rating (See Figure 2)
On Resistance (See Figure 3, Note 8)
Leakage Current at Rated Voltage
Turn-On Time
Turn-Off Time
dV/dt @ 60 Vdc (See Note 8)
Electrical System Spike (See Note 9)
Input to Output Capacitance at 1 MHz (See Note 9)
Dielectric Strength
Insulation Resistance
Junction Temperature
Thermal Resistance (Junction to Ambient)
Solderability (10 sec)
1000
10
8
Max Units
60
80
1.5
0.5
100
4.5
0.5
100
Vdc
Vdc
Adc
Ohm
µA
ms
ms
V/µs
±
600 Vpk
20
pF
Vrms
Ohm
130
90
260
°C
°C/W
°C
© 2004 TELEDYNE RELAYS
(800) 284-7007 • www.teledynerelays.com
SR75-1 1
SR75-1\062004\Q1
Series SR75-1
INPUT CURRENT (mA)
INPUT VOLTAGE (Vdc)
INPUT CURRENT VS VOLTAGE
FIGURE 1
2.0
CONTINUOUS LOAD CURRENT (Amp)
1.6
1.2
0.8
0.4
0.0
–55
-35
-15
5
25
45
65
85
105
125
AMBIENT TEMPERATURE (°C)
LOAD CURRENT DERATING CURVE
FIGURE 2 (SEE NOTE 7)
0.5
TRIP TIME VS. OVERLOAD CURRENT
FIGURE 4
ON-RESISTANCE (OHM)
0.4
WIRING CONFIGURATIONS
RS
LOAD
RETURN
16
14
12
10
0.3
0.2
0.1
VCC
0.0
–55
-35
-15
5
25
45
65
85
105
125
SR75-1
1
3
5
8
LOAD
+V
JUNCTION TEMPERATURE (°C)
+
TYPICAL ON RESISTANCE VS T
J
FIGURE 3
SHORT-CIRCUIT PROTECTED DC LOADS
(SEE NOTES 2, 4 AND 6)
V BIAS = 5.0 VDC
LOAD
16
14
12
10
RETURN
CTRL
MECHANICAL SPECIFICATIONS
TTL
SR75-1
1
V BIAS = 5.0 VDC
3
5
8
LOAD
+V
SHORT-CIRCUIT PROTECTED AC LOADS
(SEE NOTE 6)
NOTES:
1. The input voltage is 5.0 Vdc for all tests unless otherwise
specified.
2. For input voltage greater than 6.0 Vdc a series resistor
must be used to limit the power dissipation on the input of
the relay. The resistor value should be selected using the
following equation:
R = (V
BIAS
- 6 volts)/11mA
3. The input transitions are to be less than 1.0 msec duration.
4. Inductive loads must be diode suppressed.
5. Reversing the output polarity when the relay is in overload
or is sustaining a short circuit may cause permanent
damage.
6. Loads may be switched in either the high side or the low
side of the power source.
7. Continuous load current rating is determined with relay
mounted on a printed circuit card.
8. Tested at 25°C only.
9. Qualification and/or random sample test only.
© 2004 TELEDYNE RELAYS
SR75-1\062004\Q1
• Operating Temperature Range
–55°C to 105°C
• Storage Temperature Range
–55°C to 125°C
• Weight: 2.0 grams maximum
• Case: 16-pin Dual-In-Line (TO-116)
• Case Material: Filled Epoxy, self
extinguishing
SR75-1 2
SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE
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