ST
1
ds_61A09_en_st: 070313D
ORDERING INFORMATION
1a1b/2a 8A ST RELAYS
FEATURES
1. Even with small form factor,
sensitive enough for direct IC-
driving
The dimensions of this high-density
4-gap balanced armature are 31 mm
14 mm 11 mm 1.220 inch .551 inch
.433 inch. Despite this small size,
high sensitivity is achieved by a
mechanism that incorporates high-
efficiency polarized magnetic circuits
along with our exclusive spring
alignment method. With an minimum
operating power of about 150 mW,
nominal operating power of 240 mW,
this relay can be directly driven by
transistor or chip controllers.
2. High switching capability
Strong against lamp inductive loads,
maximum switching capacity has
reached 3,040 VA (8A 380V AC).
3. High breakdown voltage – Optimal
for control in 250 V power circuits
High breakdown voltage has been
achieved. Between contacts and coil of
3,750 Vrms; Surge breakdown voltage
between coil and contact of 6,000 V,
and between open contacts of
1,200 Vrms mean that these relays are
suitable even for 250 V power circuit
control.
4. Improved stability
Conforms to all types of safety
standards.
Insulating distance of more than 3 mm
secured, approx. 4 mm. Complies with
Japan Electrical Appliance and
Material Safety Law requirements for
operating 200 V power supply circuits,
and conforms with UL, CSA and VDE
standards.
5. Latching types available
In addition to single side stable types,
convenient 2 coil latching types with
memory functions are also available.
Moreover, we offer 2 Form A
specifications which, with double pole
switching for applications such as
250 V power circuit switching, can
enable safer designs.
6. Automatic cleaning possible
The sealed design means that these
relays can undergo immersion in
automatic washing systems and are
suitable for automatic soldering. Even
in difficult environments, the contacts
remain reliable.
7. Easy to design PC board patterns
Features 4/10 dual-in-line terminals.
Because the lead spacing has a pitch
greater than 7.54 mm .297 inch,
designers can make easy adjustments
with the width of the land size. This,
along with the large insulation
distance, simplifies the drawing of PC
board patterns.
8. To improve soldering efficiency,
preapplication of solder to the
terminals is recommended.
9. Sockets are available.
Contact material
F: AgSnO2 type contact
Coil voltage
DC 3, 5, 6, 9, 12, 24, 48 V
Contact arrangement
1: 1 Form A 1 Form B
2: 2 Form A
ST F
Operating function
Nil:
L:
L2:
Single side stable
1 coil latching
2 coil latching
Note: UL/CSA, VDE type is standard.
ST
2ds_61A09_en_st: 070313D
TYPES
Standard packing: Tube: 50 pcs.; Case: 500 pcs.
RATING
1. Coil data
1) Single side stable
2) 1 coil latching
3) 2 coil latching
Contact arrangement Nominal coil voltage Single side stable 1 coil latching 2 coil latching
Part No. Part No. Part No.
1 Form A 1 Form B
3V DC ST1-DC3V-F ST1-L-DC3V-F ST1-L2-DC3V-F
5V DC ST1-DC5V-F ST1-L-DC5V-F ST1-L2-DC5V-F
6V DC ST1-DC6V-F ST1-L-DC6V-F ST1-L2-DC6V-F
9V DC ST1-DC9V-F ST1-L-DC9V-F ST1-L2-DC9V-F
12V DC ST1-DC12V-F ST1-L-DC12V-F ST1-L2-DC12V-F
24V DC ST1-DC24V-F ST1-L-DC24V-F ST1-L2-DC24V-F
48V DC ST1-DC48V-F ST1-L-DC48V-F ST1-L2-DC48V-F
2 Form A
3V DC ST2-DC3V-F ST2-L-DC3V-F ST2-L2-DC3V-F
5V DC ST2-DC5V-F ST2-L-DC5V-F ST2-L2-DC5V-F
6V DC ST2-DC6V-F ST2-L-DC6V-F ST2-L2-DC6V-F
9V DC ST2-DC9V-F ST2-L-DC9V-F ST2-L2-DC9V-F
12V DC ST2-DC12V-F ST2-L-DC12V-F ST2-L2-DC12V-F
24V DC ST2-DC24V-F ST2-L-DC24V-F ST2-L2-DC24V-F
48V DC ST2-DC48V-F ST2-L-DC48V-F ST2-L2-DC48V-F
Nominal coil
voltage Pick-up voltage
(at 20C 68F)Drop-out voltage
(at 20C 68F)
Nominal operating
current
[10%] (at 20C 68F)
Coil resistance
[10%] (at 20C 68F)Nominal operating
power Max. allowable voltage
(at 20C 68F)
3V DC
80%V or less of
nominal voltage
(Initial)
10%V or more of
nominal voltage
(Initial)
78mA 38
240mW 150%V of
nominal voltage
5V DC 47mA 105
6V DC 40mA 150
9V DC 25mA 360
12V DC 20mA 600
24V DC 10mA 2,400
48V DC 5mA 9,000
Nominal coil
voltage Pick-up voltage
(at 20C 68F)Drop-out voltage
(at 20C 68F)
Nominal operating
current
[10%] (at 20C 68F)
Coil resistance
[10%] (at 20C 68F)Nominal operating
power Max. allowable voltage
(at 20C 68F)
3V DC
80%V or less of
nominal voltage
(Initial)
10%V or more of
nominal voltage
(Initial)
37mA 80
130mW 150%V of
nominal voltage
5V DC 21mA 230
6V DC 18mA 330
9V DC 12mA 730
12V DC 9mA 1,300
24V DC 5mA 5,000
48V DC 2.7mA 18,000
Nominal coil
voltage Set voltage
(at 20C 68F)Reset voltage
(at 20C 68F)
Nominal operating
current
[10%] (at 20C 68F)
Coil resistance
[10%] (at 20C 68F)Nominal operating
power Max. allowable voltage
(at 20C 68F)
Set coil Reset coil Set coil Reset coil Set coil Reset coil
3V DC
80%V or less of
nominal voltage
(Initial)
80%V or less of
nominal voltage
(Initial)
75mA 75mA 4040
240mW 240mW 150%V of
nominal voltage
5V DC 45mA 45mA 110110
6V DC 37mA 37mA 155155
9V DC 25mA 25mA 360360
12V DC 18mA 18mA 640640
24V DC 10mA 10mA 2,4002,400
48V DC 4.7mA 4.7mA 10,20010,200
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ds_61A09_en_st: 070313D
2. Specifications
REFERENCE DATA
Characteristics Item Specifications
Contact Arrangement 1 Form A 1 Form B, 2 Form A
Contact material Au-flashed AgSnO2 type
Initial contact resistance, max. Max. 30 m (By voltage drop 6 V DC 1A)
Rating
Max. switching power (resistive load) 3,040 VA, 150 W
Max. switching voltage 380 V AC, 250 V DC
Max. switching current 8 A
Minimum operating power 150mW (Single side stable, 2 coil latching)
Nominal operating power 240mW (Single side stable, 2 coil latching)
Min. switching capacity (Reference value)*1
*1 This value can change due to the switching frequency, environmental conditions, and desired reliability level, therefore it is recommended to check this with the actual
load.
100 mA 5V DC
Electrical
characteristics
Insulation resistance (Initial)
(at 25C, 50% relative humidity) Min. 1,000M (at 500V DC)
Measurement at same location as “Initial breakdown voltage” section.
Breakdown voltage
(Initial)
Between open contacts 1,200 Vrms for 1 min. (Detection current: 10 mA)
Between contact sets 2,000 Vrms for 1 min. (Detection current: 10 mA)
Between contact and coil 3,750 Vrms for 1 min. (Detection current: 10 mA)
Surge breakdown voltage (Initial)*2
*2 Wave is standard shock voltage of 1.250s according to JEC-212-1981.
6,000 V (Between contact and coil)
Operate time [Set time] (at 20C 68F)Max. 15 ms [Max. 15 ms]
(Nominal voltage applied to the coil, excluding contact bounce time.)
Release time [Reset time] (at 20C 68F)Max. 10 ms [Max. 15 ms]
(Nominal voltage applied to the coil, excluding contact bounce time.) (without diode)
Temperature rise (at 60C 140F)Max. 55C
(By resistive method, nominal voltage applied to the coil; contact carrying current: 8A.)
Mechanical
characteristics
Shock resistance Functional Min. 196 m/s2 (Half-wave pulse of sine wave: 11 ms; detection time: 10s.)
Destructive Min. 980 m/s2 (Half-wave pulse of sine wave: 6 ms.)
Vibration resistance Functional 10 to 55 Hz at double amplitude of 2 mm (Detection time: 10s.)
Destructive 10 to 55 Hz at double amplitude of 3 mm
Expected life Mechanical Min. 107 (at 180 times/min.)
Electrical Min. 105 (8 A 250 V AC resistive) (ON : OFF = 1 s : 5 s)
Conditions Conditions for operation, transport and storage*3
*3 Refer to “6. Usage, Storage and Transport Conditions“ in AMBIENT ENVIRONMENT section in Relay Technical Information.
Ambient temperature: –40C to +60C –40F to +140F;
Humidity: 5 to 85% R.H. (Not freezing and condensing at low temperature)
Max. operating speed 20 times/min.*4
*4 The max. operating speed amounts to 30cps without load.
Unit weight Approx. 10g .353 oz
1. Max. switching power 2. Coil temperature rise 3. Influence of adjacent mounting
10
5
2
1
0.5
0.2
0 20 50 100
200 300 600 1000
Voltage, V
Current, A
AC inductive
load
(cosϕ=0.4)
DC inductive
load
(L/R=40ms)
AC resistive load
DC resistive
load
100
0.2 0.4 0.6 0.8 1.0 1.2
90
80
70
60
50
40
30
20
10
0
Temperature rise, °C
Coil operating power, W
0A
Contact current 8A
Pick-up voltage
Drop-out voltage
40
30
20
10
0
-10
-20
-30
-40 5101520
Rated of change, %
Inter-relay distance, mm
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4ds_61A09_en_st: 070313D
DIMENSIONS(mm inch)
SAFETY STANDARDS
NOTES
For Cautions for Use, see Relay Technical Information.
UL/C-UL (Recognized) CSA (Certified) VDE (Certified) TV rating (UL/CSA)
File No. Contact rating File No. Contact rating File No. Contact rating File No. Rating
E43028 8A 250V AC
1/4HP 125, 250V AC
5A 30V DC
LR26550
etc. 8A 250V AC
1/4HP 125, 250V AC
5A 30V DC
1017 8A 250V AC (cos=1.0)
4A 250V AC (cos=0.4)
5A 30V DC
UL: E43028
CSA: LR26550 —
Download from our Web site.
CAD Data
CAD Data
CAD Data External dimensions
General tolerance: 0.5 .020
31.0
11.0
7.62 7.6210.16 10.16
14
0.3
3.5 .138
1.0 1.0
.039 .039
0.6 dia. .024 dia.
0.3 .012
85
4321
76
1.0
.039
0.5
.020
.300 .300.400
1.220
.400
.551
.433
.012
PC board pattern (Bottom view)
Tolerance: 0.1 .004
2 coil latching
types only.
8-1.4 dia.
2.54
2.54
.100
.100
8-.055 dia.
Schematic (Bottom view)
Single side stable / 1 coil latching 2 coil latching
1 Form A 1 Form B 2 Form A 1 Form A 1 Form B 2 Form A
14
5678
-+
14
5678
-+
12
5678
-+ 34
+- 12
-+ 34
+-
5678
(Deenergized condition) (Reset condition)
1. PC board patterns for 2 coil latching
types
When applying relays in power supply
operation circuits for finished products
regulated by the Electrical Appliance and
Material Safety Law, use the pattern
shown below.
2. Soldering should be done under the
following conditions:
1)
250C 482F within 10s
300C 572F within 5s
350C 662F within 3s
2) For automatic cleaning, the boiling
method is recommended. Avoid
ultrasonic cleaning which subjects the
relays to high frequency vibrations, which
may cause the contacts to stick.
It is recommended that a fluorinated
hydrocarbon or other alcoholic solvents
be used.
3. When using, please be aware that
the a contact and b contact sides of 1
Form A and 1 Form B types may go on
simultaneously at operate time and
release time.
1Terminal No. 2 3 4
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ds_61A09_en_st: 070313D
PRECAUTIONS FOR USE (SOCKET)
ACCESSORIES ST RELAYS
SOCKET
VDE
ST relay socket
ST-PS
PC board terminal socket
ST-SS
Solder terminal socket
FEATURES
1. Possible to fit or remove the
chassis with one touch (t = 0.6 mm
to 2.2 mm .024 inch to .087 inch)
2. Easy design of PC board pattern
(2.54 mm x 4 pitch DIL terminal array)
3. Complies with Japan Electrical
Appliance and Material Safety Law.
(UL and VDE certification)
4. High breakdown voltage.
SPECIFICATIONS
Item Specifications
Breakdown voltage (Initial) Between contact and coil: 4,000 Vrms for 1 min. (Detection current: 10 mA)
Between contact and terminal: 2,000 Vrms for 1 min.
Insulation resistance (Initial) Min. 1,000 M between terminals (500V DC)
Heat resistance 150C 302F for 1 hr
Max. continuous current 10 A
Relay insertion life 15 times
31.6
35.4
16.6
8
1
7
2
6
3
5
4
14.6
16.4
10.16
1.05
0.3
5.5
4
4.3
0.27
10.16
7.62 7.62
1.244
1.394
.654
.575
.646
.400
.041
.012
.217
.158
.169
.011
.400
.300 .300
31.6
35.4
16.6
8
1
7
2
6
3
5
4
14.6
16.4
10.16
2.3
0.3
5.5
4
5.3
0.27
10.16
7.62 7.62
1.244
1.394
.654
.575
.646
.400
.012
.217
.158
.209
.011
.400
.300 .300
.090
DIMENSIONS (Unit: mm inch)
ST-PS ST-SS
1. PC board mounting method
PC board pattern
The terminal configuration is symmetrical
on the left and right, so an arrow mark
is stamped on the socket to prevent mis-
insertion. We recommend printing the
same arrow mark on the component
mounting side (side opposite from
pattern) of the PC board. In this case, the
terminal configuration becomes the
terminal nos. noted near the drilling
holes.
2. Chassis cutout
Chassis cutting dimensions
If the chassis hole is punched with a
press, set so the release R on the front
side (A side).
The range for chassis thickness is 0.6 to
2.2 mm .024 to .087 inch.
3. Relay mounting and removal
(1) Align the directions of the relay and
socket.
(2) Insert the relay all the way in, so it is
securely in place.
(3) Press the part indicated by A in the B
direction, and fasten by placing the hook
on the relay.
(4) When removing the relay, completely
release the hooks on both sides and pull
the relay out.
2.54
8-1.5 dia.
87 65
12 34 2.54
Contact
terminal
interval
Coil
terminal
interval
.100
8-.060 dia.
.100
15.0±0.2
32.5±0.1
.591±.008
1.280±.004
Claw for chassis
fastening
Chassis t = 0.6 to 2.2
Press
A side
.024 to .087
Relay
Hinge
mechanism
Relay case
cross-section
B
(Fastening complete)(Before fastening)
A
