TD-1412
ENGINEERING DATA SHEET
REPEAT CYCLE-TIMER
1PST
FEATURES
q
q
q
q
q
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Small size and weight
High-reliability design
Hermetically sealed
High transient immunity
Qualified to MIL-PRF-83726/22
Reverse Polarity Protection
PRINCIPLE TECHNICAL CHARACTERISTICS
-8
3
Seal:Hermetic Tested per MIL-
1x10 atm, cm /s max
STD-883, Method 1014 Condition
leakage
B, C
Tin Plate
Finish: per MIL-T-10727
Terminals:
"A" (Tin Plate)
"W" (Tin Plate)
APPLICATION NOTE:
101
Weight
Solder-lug
Plug-in PCB mountable
0.5 Ounce max.
DESCRIPTION
The TD-1412 Time Delay Relays are designed with thick film hybrid microelectronics timing circuits and are
packaged in a hermetically sealed military style enclosure. The TD-1412 series are qualified to MIL-PRF-
83726/22 and designed to withstand severe environmental conditions encountered in military/aerospace
applications. These relays are suited for use in power control, communication circuits and many other
applications where power switching and high reliability are required over a wide temperature range.
Featuring
LEACH
©
power and control solutions
www.esterline.com
AMERICAS
6900 Orangethorpe Ave.
P.O. Box 5032
Buena Park, CA 90622
.
.
Tel: (01) 714-736-7599
Fax: (01) 714-670-1145
EUROPE
2 Rue Goethe
57430 Sarralbe
France
.
.
Tel: (33) 3 87 97 31 01
Fax: (33) 3 87 97 96 86
ASIA
Units 602-603 6/F Lakeside 1
No.8 Science Park West Avenue
Phase Two, Hong Kong Science Park
Pak Shek Kok, Tai Po, N.T.
Hong Kong
Tel: (852) 2 191 3830
Fax: (852) 2 389 5803
Data sheets are for initial product selection and comparison. Contact Esterline Power Systems prior to choosing a component.
Date of issue: 07/10
- 89 -
Page 1 of 3
ELECTRICAL SPECIFICATION
Input (Control) Parameters
Timing:
a. Operation, (Flasher)
b. Method
c. Range
d. Accuracy
Recycle Time
Operations: (X1-X2)
a. Input & Control Voltage
b. Operating Current
Transients: MIL-STD-704A, Limit 1
a. Spike Susceptibility
b. Self-Generated Spikes
Electromagnetic Interference Per MIL-STD-461A
Duty Rating
Output (Load) Parameters
Contact Form
Contact Rating:
Voltage Drop
Dielectric Strength:
a. @ Sea Level, 60 Hz
b. @ 80,000 ft., 60 Hz
Insulation Resistance @ 500 Vdc
SPST
250 mA, Max.
2 Vdc, Max.
1000 Vrms [3]
350 Vrms
1000 M
Ω
[3]
Repeat Cycle Timer
Fixed Cycle
1 to 600 Cycles/Min. [5]
±10% [1]
10 ms, Max [4]
18-32 Vdc
5 mA, Max @ +25° C
+80 Volts Max
-600 Volts Max
None
Class 1D [2]
Continuous
TD-1412
GENERAL CHARACTERISTICS
Ambient Temperatures Range:
a. Operating
b. Non-Operating
Vibration:
a. Sinusoidal
10-80 Hz
80-3000 Hz
b. Random: 50-2000 Hz, MIL-STD-810
Shock, 0.5 MS, 1/2 Sine, 3 Axis
Acceleration, in any Axis
Life at Rated Resistive Load; Minimum
0.06" DA
30 G
0.4 G
2
/Hz
1,100 G
100 G
1,000,000 operations
-55 to +125° C
-55 to +125° C
NUMBERING SYSTEM
PCB Mount
TD-1412 - 2500
|
|
1
3
M83726/22 - 2500
|
|
|
1
2
3
W
|
4
W
|
4
Flange Mount
TD-1412 - 2500
|
|
1
3
M83726/22 - 2500
|
|
|
1
2
3
A
|
4
A
|
4
1.
2.
3.
4.
Model Number or Basic "MIL-PRF" Series number.
Military "Slash" number.
Timing Cycle, Fixed: 100 milliseconds to 60 seconds. (See Note 5).
Mounting style and quality level (See Note 6).
W = Printed circuit mountable.
A = Flange mount with solder hook terminals.
Date of issue: 0710
- 90 -
Page 2 of 3
MECHANICAL SPECIFICATIONS
TD-1412
NOTES
[1] The accuracy specification applies for any combination of operating temperature and voltage.
[2] EMI test limits will not be exceeded during the timing interval or when continuously energized under steady
state conditions, per paragraph 3.23, MIL-PRF-83726C.
[3] Terminals X1 and X2 must be connected together during the test. Dielectric withstanding voltage and
insulation resistance are measured at sea level between all mutually insulated terminals and between all
terminals and case.
[4] Recycle time is defined as the maximum time power must be removed from terminal X1 to assure that a new
cycle can be completed within the specified timing tolerance.
[5] A four digit number defines the length of one complete cycle, expressed in milliseconds. "On" time is 50% of
each cycle. The first three digits are significant figures, used to define the the specific cycle. The fourth digit
represents the number of zeros to follow the first three digits.
Examples:
- 1001 = 1 cycle/second (1,000 milliseconds cycle)
- 2500 = 4 cycle/seconds (25 milliseconds cycle)
- 6002 = 1 cycle/minute (60,000 milliseconds cycle)
[6] Quality level as specified in MIL-R-83726B, paragraph 3.1.1, 3.1.2 and 3.1.3.
Date of issue: 07/10
- 91 -
Page 3 of 3
Application notes
DERATING OF CONTACTS FOR DC VOLTAGES
ABOVE NOMINAL RATING
N°101
To establish a standard for the derating of relay contacts is, at best, a subjective practice. Limitations are governed by the type
of relay, contact gap, maximum voltage capabilities of the relay contact system, and the contact material.
The most common method is to derate the contacts by use of the Power Formula, using the known current and voltage.
This method is valid only for
Resistive Loads,
and is an approximation only; keeping in mind the limitations mentioned above.
Power = IE (Current x Voltage)
I
2
E
2
= 2/3 I
1
E
1
Example:
A designer is working with a 55 volt DC system and has a relay rated at 10 amps resistive at 28 volts DC.
What is the maximum current that can be switched at 55 Vdc.
I
1
= 10 Amperes
E
1
= 28 VDC
E
2
= 55 VDC
I
2
= ? (Current ratings at 55 VDC Resistive)
I
2
E
2
= 2 I
1
E
1
/3
I
2
= 2 I
1
E
1
/E
2
3
= 2 (10 x 28)/55 x 3
= 560/165
I
2
= 3.4 Amperes at 55VDC
In addition, the user should always be concerned about the following:
1. Derating contacts that are rated for less than 10 Amperes at nominal voltage.
2. Derating contacts for use in system voltages above 130 Volts DC
Date of issue: 6/00
- 14 -
Page 1 of 1
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