COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
2
DIMENSIONS
in Millimeters (Inches)
RedRock™ MEMS-Based Reed Sensor
Ideally suited to the needs of Medical, Industrial, Instrumentation, Automotive, and
other applications where small size, zero power operation, and directional magnetic
sensitivity are required, the RedRock
™
MEMS-Based Reed Sensor is a single-pole,
single throw (SPST) device with normally open ruthenium contacts. e sensor may
be actuated by an electromagnet, a permanent magnet, or a combination of both.
RedRock™ MEMS-Based Reed Sensor
u
1.11mm
2
Footprint – World’s Smallest Reed Sensor
u
Highly Directional Magnetic Sensitivity
u
Hot Switchable
u
750 G Shock Resistance
u
Wide Operating Temperature Range
u
Hermetically Sealed
u
Ideal for SMD Pick and Place
u
Tape and Reel Packaging
u
RoHS Compliant
REDROCK™ MEMSBASED REED SENSOR
u
Medical Devices
u
Battery Powered Devices
u
Prosthetics
u
Robotics
u
Animal Tracking
u
High Resolution Position &
Level Sensing
APPLICATIONS
Top View
Side View
Bottom View
1.05(0.041)
0.84(0.033)
1.32(0.052)
0.457(0.018)
0.80(0.031)
0.686(0.027)
0.435
(0.017)
0.300
(0.012)
0.735(0.029)
1.285(0.051)
0.744(0.029)
0.185(0.007)
0.55(0.022)
Top View
Side View
Bottom View
1.05(0.041)
0.84(0.033)
1.32(0.052)
0.457(0.018)
0.80(0.031)
0.686(0.027)
0.435
(0.017)
0.300
(0.012)
0.735(0.029)
1.285(0.051)
0.744(0.029)
0.185(0.007)
0.55(0.022)
Recommended PCB Land pattern as
viewed from bottom of die (pad side)
All specifications are typical unless otherwise specified and subject to change without notice.
For more information please refer to Coto Technology’s Product Warranty, Trademarks & Disclaimers.
rev. 03202015
Operating Temperature Range is -40ºC to +85ºC
Ordering Information
Part Number RR100-X
W
TR
Model Number
RR100
Typical Magnetic Sensitivity
J=20mT
K=12mT
Package Style
W=Wafer Level
Product Packaging
TR=Tape/Reel
Ordering Information (Evaluation Kit)
Part Number: RR100-EK1
™
COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
3
REDROCK™RR100
Parameters Units Min Typ Max
OPERATING CHARACTERISTICS
Operate Sensitivity1 - K
JmT 12
20
Operate Time (including bounce)
μ
s500
Release Time
μ
s500
ELECTRICAL CHARACTERISTICS
Switched Voltage VDC 6
Switched Current mA DC 1
Breakdown Voltage VDC 50
Contact Resistance (Initial) W10
Contact Capacitance pF 0.2
Insulation Resistance (Min.) W1012
LIFE EXPECTANCY
1.2VDC, 1mA switching load2Operations 107
ENVIRONMENTAL RATINGS
Storage Temperature ºC -55 to +150
Operating Temperature ºC -40 to +85
Vibration Resistance - Functional3G100
Shock Resistance - Functional4G750
Shear Force5gm 400
Notes:
1 Individual switches may vary in magnetic closure sensitivity by ± 4 mT (Model K) or ± 7 mT (Model J) from the typical value.
If your application requires a dierent sensitivity range, please contact Coto at redrock@cotorelay.com.
2Life expectancy dened as mean cycles before failure with end of life dened as contact resistance >1000 W.
3Functional Vibration Resistance is dened as the mechanical-only force (in G, 110 Hz - 3 kHz), that a switch can withstand without causing a
contact closure.
4Functional Shock Resistance is dened as the mechanical-only force (in G), that a switch can withstand without causing a contact closure.
5Shear Force is the mechanical force (applied to the top half, in a plane parallel to the PCB) that a switch can withstand without causing damage
to the switch.
REDROCK™ MEMSBASED REED SENSOR
For all inquiries,
please contact redrock@cotorelay.com
rev. 03202015
COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
4
3º
1.08 (.043)
Ao REV.1
1.12 (.044)
Ko REV.1
4.00 (.157)
P
3.50±0.05
(0.138±0.001)
F
6.25
(0.246)
E2
MIN
8.30 (0.327)
MAX
W
8.0 (0.315)
NOMINAL
1.75 (0.069)
E1
Ø 1.50
Do
+.10
-.00
4.00 (0.157)
Po
3º
1.57 (.062)
Bo
2.00±0.05
(0
.079±0.001)
P2 .0591+.0039
-.0000
[]
.30 (.012)
T
POCKET SIZE
Ao - 1.08mm (.043”)
Bo - 1.57mm (.062”)
Ko - 1.12mm (.044”)
REDROCK™ TECHNICAL & APPLICATIONS INFORMATION
rev. 02122015
SWITCH ANGLE SENSITIVITY ATTACHMENT DETAILS
SWITCH PACKAGINGSWITCH FUNCTIONAL DIAGRAM
EXPECTED LIFE
Fig. 1: Black points indicate relative magnetic closure sensitivity
of the RR100 switch. Switch viewed from top. Note position of
switch orientation dot.
e RR100 switch may be attached to the user’s circuit board us-
ing either SnPb eutectic alloy or SAC alloy solder pastes. Recom-
mended reow proles for both types of solder are shown below.
Standard Packaging for the RR100 switch is Tape and Reel.
Dimensions are shown below.
Fig. 3: Recommended reow prole – SnPb alloy
Fig. 4: Recommended reow prole – SAC alloy.
Fig. 5: Tape and reel Packaging
Fig. 2: Switch is magnetically operated, normally-open, single-
pole, single-throw (SPST). Closes when immersed in a magnetic
eld that exceeds 20 mT (Type J) or 12 mT (Type K) Operation
is independent of the magnetic polarity.
Ten million cycles, 1.2 V 1.2 mA hot switched load, when oper-
ated by a magnetic eld having twice the nominal closure eld.
End of life dened as contact resistance exceeding 1000 Ω.
90
60120
15030
0180
210330
300240
2
270
14
10
8
14
12
8
6
6
4
4
2
10
14 12 10 14121088664422
12
Adv on (mm) vs angle polar
Retract off (mm) vs angle polar
RR100
2
2
2
2
2
Pre-heating
zone
Pre-flow zone
Reflow zone
Time above
183∞C
(60 - 90 sec)
Peak Temperature
226∞C Max
Cooling
zone
Ambient
Time (sec)
Temperature (C)
250
200
150
100
50
030 60 90 120 150 180 210 240 270 3000
Pre-heating
zone
<2.5∞C/sec Pre-flow zone
Reflow zone
Time above
217∞C
(60 - 90 sec)
Peak Temperature
235-260∞C
(20 sec max)
Cooling zone
Time (sec)
Temperature (C)
Ambient
300
250
200
150
100
50
030 60 90 120 150 180 210 240 270 3000
NO MAGNETIC FIELD MAGNETIC FIELD PRESENT
1
SWITCH
PADS
2
COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
5
REDROCK™ TECHNICAL & APPLICATIONS INFORMATION
rev. 02122015
SAMPLE APPLICATIONS CIRCUITS
GENERAL APPLICATIONS NOTES
AND INFORMATION
1. Conversion to Single Pole Single Throw Normally
Closed Operation
In some cases, it is desirable for the switch to open in the pres-
ence of a magnetic eld rather than to close. is functionality
can be achieved with the circuit shown below, which incorporates
a P-channel enhancement-mode MOSFET. R2 can be selected
in the range of 100 Megohms to several thousand Megohms
depending on the characteristics of the MOSFET. When the
RedRock switch is open, the gate is negative biased relative to the
source, allowing battery current to ow to the load. Conversely,
when the switch is closed, the MOSFET turns o. Note that
a small quiescent current drained from the battery through R2
while the switch is closed. Bear this in mind when selecting the
battery type and value of R2.
1. Choosing magnets
e RR100 switch can be operated by any permanent magnet
that generates a magnetic eld at the required operating distance
that is greater than the lower end of the switch’s nominal closure
sensitivity range. For example, a RR100-JWTR switch will close
when immersed in a eld that exceeds 20 mT, when it is angled
towards the pole of the magnet at the angle shown in Figure 1.
is is the minimum required eld; for optimum contact life, a
higher eld is desirable, and there is no maximum eld that will
damage the switch. Bear this in mind when designing a switch-
magnet system.
2. mT vs A/m, Gauss and Oe
Coto species switch closure sensitivity in mT (millitesla). One
mT is equivalent to exactly 10 Gauss or approximately 1.257 A/m
(Amps per meter). One Oe (Oersted) = 1 Gauss in air.
3. Magnetic overdrive
Magnetic overdrive is any excess magnetic eld above the mini-
mum level needed to just close the switch. For example, if the
nominal closure eld is 20 mT and the switch is immersed in a
eld of 40 mT, 100% overdrive is being applied. Overdrive is
desirable, since higher forces are applied to the contacts, and the
contact resistance is reduced. ere is no level of overdrive
2. Interfacing RedRock with Microcontrollers
Most low power microcontrollers, have one or more pins des-
ignated as interrupt or “wake-up” pins. Suitably programmed,
the microcontroller recognizes a positive or negative logic level
transition on the designated pin and changes from a sleep mode
where very little power is consumed to full operational mode.
e RR100 switch shown in Figure 7 is normally closed by a
magnet; when it opens, the wake-up pin goes low, waking up
the microcontroller. R2 should be chosen to be as large a value
as possible, but no higher than one-tenth the input impedance
of the wake-up pin. is will minimize the quiescent current
draw through R1 and R2 while the switch is closed. Consult the
microcontroller documentation for further details.
Fig. 6: Conversion to normally closed (N/C) functionality, using
P-channel, enhancement mode MOSFET.
Fig. 7: Typical method of interfacing an RR100 switch to a low-
power microcontroller. When RR100 switch opens, wake-up pin
goes logic low, bringing microcontroller out of sleep mode. R2
should be no greater than one-tenth of the microcontroller’s input
pin impedance.
RR100
switch R1
LOAD
1 Meg
R2
Bat
PMOS
M1
microcontroller
wake-up pin
RR100
switch
R1
10K
R2
see note
Vcc
COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
6
REDROCK™ TECHNICAL & APPLICATIONS INFORMATION
rev. 02122015
e following Applications Notes and White Papers relating to
the RR100 switch are available in the Resource Library area of
the Coto Website.
1.
White Paper: “MEMS-Based Magnetic Reed
Switch Technology”
2.
IEEE Holm Conference Paper: “A High Aspect
Ratio Microfabricated Switch Capable of Hot
Switching”
3.
Tech Tips: Soldering Guidelines for the RedRock
Switch
4.
Tech Tips: Angular Sensitivity Map of RedRock
Switch
5.
Tech Tips: Optimal Z-Axis Magnet Positioning of
RedRock Switch
INFORMATION RESOURCES
GENERAL APPLICATIONS NOTES
AND INFORMATION, CONT.
GLOSSARY OF TERMS
that can damage the switch. erefore, use the strongest, largest
magnet that is practical for the application.
4. High fields cannot damage switch
Strong magnetic elds will not damage the switch or change its
closure sensitivity.
5. Polarity insensitive
e switch responds equally to N (positive) or S (negative) elds.
6. Optimum orientation of magnet relative to switch
e switch has maximum closure sensitivity when the magnet is
oriented at 60o relative to its long axis. Refer to the diagram in
Fig. 1, and note that the position of the location dot is important.
7. Magnetic environment near the switch
is important
Ferrous materials such as metal frames and component enclo-
sures etc. located near the magnet and switch can alter the switch
closure sensitivity, by attenuating or enhancing the eld reach-
ing the switch. Coto recommends that the switch and magnet
be tested in the applications environment, including all ferrous
structures.
8. Shunts and field concentrators
Ferrous structures located near the magnet and switch can
sometimes be used advantageously to increase the magnetic
eld strength near the switch and increase its apparent magnetic
sensitivity. ese arrangements can be investigated experimen-
tally, but simulation using magnetic modeling programs is more
ecient.
9. Contact debouncing
Since the RR100 is a mechanical switch, the contacts may
bounce after closure. Implement a hardware or software de-
bounce solution if contact bounce is likely to cause switching
logic problems.
Operate Value (mT):
e mT value at which normally-open
contacts close. Lower values reect higher sensitivity.
Operate Time:
e operate time is the time between the
instant of application of a magnetic eld to a dry-reed switch and
the instant of the rst physical closing of this switch. e operate
time does not include bounce time.
Release Value (mT):
e mT value at which normally-open
contacts, held closed by a magnetic eld, will re-open as eld
strength is reduced.
Release Time:
e release time is the time between the in-
stant of removal of an applied magnetic eld to a dry-reed switch
and the instant of the rst physical opening of this switch. e
release time does not include bounce time.
Bounce:
Bounce is a momentary opening of a switch after
initial closing, or a momentary closing after initial opening.
Bounce Time:
e bounce time is the interval of time be-
tween the instant of initial closing (or opening) and the instant of
nal closing (or opening) of the dry-reed switch.
Dry-Reed Switch Contact Resistance:
e dry-reed
switch contact resistance is the resistance of the dry-reed switch
under specied conditions of measurement.
Dry-Reed Switch:
A dry-reed switch is an electrical switching
assembly containing one or more ferromagnetic contact blades,
hermetically sealed in a protective envelope, that are forced into
contact by an external magnetic eld. e eld may be gener-
ated by a current-carrying coil of wire, a permanent magnet, or a
combination of both.
REDROCK™ TECHNICAL & APPLICATIONS INFORMATION
COTO TECHNOLOGY | tel: (401) 943.2686 | cotorelay.com
7
REDROCK™ TECHNICAL & APPLICATIONS INFORMATION
rev. 02122015
COTO TECHNOLOGY PRODUCT WARRANTY
Coto Technology, Inc. (“Coto”) warrants that during the six (6) or eighteen (18) month period (“Warranty Period”) from the date
of Coto’s shipment of switches or relays and other small signal switching products (“Products”), the Products will be free from defects
in material and workmanship. is Warranty shall not apply to defects caused by disasters such as re, ood, wind, and lightning, or
by the actions or inactions of any party other than Coto including improper storage, installation, use or maintenance of the Products.
ALL OTHER WARRANTIES, WHETHER EXPRESSED OR IMPLIED OR ARISING BY OPERATION OF LAW, COURSE
OF DEALING, USAGE OF TRADE, OR OTHERWISE, ARE EXCLUDED. THERE ARE NO IMPLIED WARRANTIES OF
MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. If during the Warranty Period Customer discovers a defect
in the material or workmanship of the Products, noties Coto in writing within ve (5) days of such discovery, and substantiates that the
Products have been installed, maintained and operated in accordance with Coto’s recommendations and standard industry practice, Coto
shall (at its option) repair or replace the defective Products or refund the purchase price of the defective Products less the value of any portion
of the Products retained by Customer. Repair or replacement of the Product shall not extend the Warranty Period in any manner. THESE
REMEDIES CONSTITUTE CUSTOMER’S EXCLUSIVE REMEDIES AGAINST COTO FOR BREACH OF WARRANTY WITH
RESPECT TO THE PRODUCTS. In no case shall Coto be liable for any special, incidental or consequential damages (including, without
limitation, labor, loss of prots, loss of savings or revenue, loss of use of the Products, cost of capital, cost of any substitute Products, facilities
or service, downtime, the claim of third parties including customers, and injury to property) whether due to delays in the production,
shipment or delivery of the Products or to causes within Coto’s control and whether based upon breach of any warranty, breach of contract,
negligence, strict tort, or any other legal theory. Any legal action for breach of warranty must be commenced within the Warranty Period. If
the Products are manufactured in accordance with design data approved by the Customer; or if they have been modied or altered without
Coto’s consent; or if the Products have been misused, misapplied, damaged or used negligently, Customer agrees to hold harmless and
indemnify Coto against any loss, cost, damage or expense, including, without limitation, cost of defense, attorney’s fees, inspectors’ fees
and/or testing, resulting from (a) third party claims for personal injuries or property damage, whether direct or indirect, actual or alleged,
consequential or otherwise, notwithstanding any actual or alleged defects or hazard inherent in the Products or negligence of Coto, its
agents, employees or subcontractors, or (b) any recall, inspection, testing, replacement or correction or the Products, whether required by
governmental authority or otherwise, or (c) the violation of any law, regulation, rule, order or restriction of any governmental authority
resulting from or incident to the sale, delivery, installation and/or assembly of the Products or (d) any actual or alleged infringement of any
United States or foreign patent, copyright or similar common or civil law right.
COTO TECHNOLOGY
Copyright 2015 Coto Technology, Inc., 66 Whitecap Drive, North Kingstown, Rhode Island 02852, USA. All rights reserved. The copyright in this document is
owned by Coto Technology, Inc., a Delaware corporation. Any person is hereby authorized to view, copy, print and distribute this document subject to the fol-
lowing conditions:
u The document may be used for information purposes only.
u The document may only be used for non-commercial purposes.
u Any copy of this document or portion thereof must include this copyright notice.
TRADEMARKS
Any product, process or technology in this document may be the subject of patents or other intellectual property rights reserved by Coto Technology, Inc. or its
affiliates and subsidiaries, and may not be licensed hereunder.
The Coto Logo and the brick red color of reed relays and magnetically operated encapsulated reed switches manufactured by Coto are Registered Trademarks of
Coto Technology Inc.
All other product names, trademarks, registered trademarks, service marks or registered service marks, mentioned throughout any part of this publication
belong to their respective owners.
DISCLAIMERS
THIS PUBLICATION IS PROVIDED “AS IS” WITHOUT WARRANTY OF ANY KIND EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON INFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, TRADE, OR
PRACTICE.
THIS PUBLICATION COULD CONTAIN TECHNICAL INACCURACIES OR TYPOGRAPHICAL ERRORS. CHANGES ARE PERIODICALLY ADDED TO THE INFORMATION
HEREIN; THESE CHANGES WILL BE INCORPORATED IN FUTURE REVISIONS OF THIS PUBLICATION. COTO TECHNOLOGY, INC. MAY MAKE IMPROVEMENTS AND/OR
CHANGES IN THE PRODUCT(S), TECHNICAL SPECIFICATIONS, AND PRODUCT PROMOTIONS DESCRIBED IN THIS PUBLICATION AT ANY TIME WITHOUT NOTICE.
IN NO EVENT SHALL COTO TECHNOLOGY, INC. BE LIABLE FOR ANY ACTUAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA OR ANY
INDIRECT DAMAGES EVEN IF COTO TECHNOLOGY, INC. HAS BEEN INFORMED OF THE POSSIBILITY THEREOF.
REDROCK™ TECHNICAL & APPLICATIONS INFORMATION
8
Copyright Coto Technology 2015. All rights reserved.
66 Whitecap Drive
North Kingstown, RI 02852
401-943-2686 • Fax: 401-942-0920
www.cotorelay.com • redrock@cotorelay.com
rev. 02122015
