MP240D4 OPTO 22, MP240D4 Datasheet - Page 12

• Manufacturer Part Number: MP240D4
• Description: Solid State Relay
• Manufacturer: OPTO 22

Specifications of MP240D4

• Control Voltage Type: DC
• Input Voltage: 3VDC To 24VDC
• Load Current: 4A
• Load Voltage Range: 24VAC To 280VAC
• Switching Mode: Zero Cross
• Relay Terminals: Through Hole
• Load Voltage Max: 280VAC
• Load Voltage Min: 24VAC
• Capacitance: 8 pF (Max.) Coupling (Input-Output)
• Current, Surge, Non-repetitive Peak: 85 Apeak @ 1 Cycle
• Dimensions: 1.70 in. L x 0.40 in. W x 0.98 in. D
• Control Voltage Max: 32V
• Control Voltage Min: 3V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

DATA SHEET
Applications: Tips
Heat Sink Calculation
based on maximum junction temperature. All Opto 22 SSRs operate
conservatively at maximum junction temperatures of 110° C. Deter-
mining an adequate heat sink for a given SSR conducting a given
current is very simple.
relay base and the heat sink.
Sample Calculation Given
120-Volt, 20-Amp Load; 50° C Ambient Air
Choose Model 120D25 SSR.
Calculate dissipation as: 20 amps x 1.3 Watts per amp = 26 Watts
Calculate temperature rise junction to SSR base as: 26 Watts x 1.2° C per Watt = 31.2° C
Calculate allowable temperature of heat sink by subtracting 31.2° C from 110° C allowable junction temperature:
The heat sink is in a 50°C ambient, therefore, allowable temperature rise on heat sink is: 78.8° C-50° C = 28.8° C
If heat sink is allowed to rise 28.8° C above ambient, then the thermal resistance of the heat sink is simply the 28.8° C rise divided by
the 26 Watt. Any heat sink having a thermal resistance less than 1.1° C per Watt will be adequate.
Duty Cycle Calculation
When solid-state relays are operated in an on/off mode, it may be advantageous to calculate the RMS value of the current through the
SSR for heat sinking or determining the proper current rating of the SSR for the given application.
Form 859-050513
Dimension and specifications are subject to change. All products and/or company names throughout this data sheet are generally trademarks or registered trademarks of their respective companies.
I
RMS
T
T
I
Like all semiconductor devices, SSR current ratings must be
Note: Thermally conductive grease must be used between the
ON
1
2
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590 • Phone: [phone] • 800-321-OPTO • Fax: [phone] • www.opto22.com
= Time current is on
= Time current is off
= RMS value of load current during on period
= RMS value of load or SSR
110° C-31.2 = 78.8° C
Inside Sales: 800-321-OPTO • E-mail: [e-mail] • Product Support: 800-TEK-OPTO • 951-695-3080 • Fax: [phone]
I
RMS
SOLID-STATE RELAYS
=
(I
ON
T
)
1
2
+ T
x T
2
1
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