MDRR-DT-20-30-U - Hamlin / Littelfuse

HAMLIN REED SWITCH SELECTION GUIDE

A quick reference guide to selecting reed switches for electronic applications

Littelfuse electronics product portfolio includes:

Power Size Terminals Switch Type Package Pictures P/N

Body Length

(mm)/[Inch]

Total Length

(mm)/[Inch]

Switching

Power (W)

Switching

Voltage (V)

Switching

Current (A)

Contact

Resistance (Ω)

Operating

Temperature (°C)

Magnetic

Sensitivity (AT) Certiﬁcation

RoHS

Compliance

Low

Power

Small

Leads

A: SPST-NO Glass MITI-7 7.00 [.276] 40.38 [1.590] 10 170 Vdc, 120 Vac 0.25 Adc, 0.18 Aac 0.15 -40 to +125 6-20 RoHS

A: SPST-NO Glass MDSR-10 10.16 [.400] 40.38 [1.590] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.12 -40 to +125 10-25 RoHS

A: SPST-NO Glass MDSR-7 12.70 [.500] 40.38 [1.590] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-25 RoHS

SMD

A: SPST-NO Glass MISM-7 7.00 [.276] 13.72 [.540] 10 170 Vdc, 120 Vac 0.25 Adc, 0.18 Aac 0.15 -40 to +125 6-20 RoHS

A: SPST-NO Glass MDSM-10 10.16 [.400] 15.62 [.615] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.12 -40 to +125 10-25 RoHS

Medium

Leads

A: SPST-NO Glass FLEX-14 14.00 [.551] 44.30 [1.744] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-30 RoHS

A: SPST-NO Glass MDCG-4 15.24 [.600] 40.38 [1.590] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 12-38 RoHS

A: SPST-NO Glass MACD-14 14.00 [.551] 44.30 [1.744] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-30 RoHS

C: SPDT-CO Glass MDRR-DT 14.73 [.580] 51.66 [2.034] 5175 Vdc, 120 Vac 0.25 Adc, 0.18 Aac 0.1 -40 to +125 15-30 RoHS

SMD

A: SPST-NO Glass MDSM-4 15.24 [.600] 19.30 [.760] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 12-38 RoHS

A: SPST-NO Glass MASM-14 14.00 [.551] 44.30 [1.744] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-30 RoHS

C: SPDT-CO Glass MDSM-DT 14.73 [.580] 25.40 [1.00] 5175 Vdc, 120 Vac 0.25 Adc, 0.18 Aac 0.1 -40 to +125 15-30 RoHS

Both

Leads

and SMD

A: SPST-NO Overmolded 59165 16.00 [.630] 20.20 [.795] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-25 RoHS

A: SPST-NO Overmolded 59166 16.00 [.630] 19.51 [.768] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.1 -40 to +125 10-26 RoHS

A: SPST-NO Overmolded 59170 11.43 [.450] 16.25 [.640] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.15 -40 to +125 10-25 RoHS

Leads

A: SPST-NO Overmolded 59045-1 17.78 [.700] 15.24 [.600] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.2 -40 to +105 15-30 RoHS

A: SPST-NO Overmolded 59050-1 22.86 [.900] 20.32 [.800] 10 200 Vdc, 140 Vac 0.5 Adc, 0.35 Aac 0.2 -40 to +105 12-33 RoHS

High

Power

Medium

Leads

A: SPST-NO Glass HA15-2 15.24 [.600] 40.38 [1.590] 20 200 Vdc, 265 Vac 0.5 Adc, 0.35 Aac 0.1 -20 to +125 17-38 RoHS

A: SPST-NO Glass MLRR-4 15.24 [.600] 40.38 [1.590] 20 200 Vdc, 140 Vac 1.0 Adc, 0.7Aac 0.1 -40 to +125 17-38 RoHS

A: SPST-NO Glass MLRR-3 15.24 [.600] 56.64 [2.230] 20 200 Vdc, 140 Vac 1.0 Adc, 0.7Aac 0.1 -40 to +125 17-38 RoHS

A: SPST-NO Glass MARR-5 19.69 [.775] 56.77 [2.235] 10 1000 Vdc, 700 Vac 0.5 Adc, 0.35 Aac 0.1 -75 to +125 17-38 RoHS

SMD

A: SPST-NO Glass MLSM-4 15.24 [.600] 19.56 [.770] 20 200 Vdc, 140 Vac 1.0 Adc, 0.7Aac 0.1 -40 to +125 17-38 RoHS

A: SPST-NO Glass MLSM-3 15.24 [.600] 19.56 [.770] 20 200 Vdc, 140 Vac 1.0 Adc, 0.7Aac 0.1 -40 to +125 17-38 RoHS

Leads A : SPST-NO Overmolded 59050-2 22.86 [.900] 20.32 [.800] 20 200 Vdc, 265 Vac 0.5 Adc, 0.35 Aac 0.2 -20 to +105 17-33 RoHS

Leads

A: SPST-NO Glass MRPR-3 19.69 [.775] 56.64 [2.230] 50 200 Vdc, 140 Vac 1.5 Adc, 1.1 Aac 0.1 -40 to +125 22-43 RoHS

A: SPST-NO Glass MRPR-8 20.32 [.800] 56.64 [2.230] 50 250 Vdc, 265 Vac 1.0 Adc, 0.7Aac 0.1 -20 to +125 22-43 RoHS

Large

A: SPST-NO Glass DRR-129 50.80 [2.000] 82.55 [3.250] 100 400 Vdc, 280 Vac 3.0 Adc, 2.1 Aac 0.1 -40 to +125 42-83 RoHS

C: SPDT-CO Glass DRR-DTH 39.67 [1.562] 85.73 [3.375] 30 500 Vdc, 350 Vac 0.5 Adc, 0.35 Aac 0.125 -20 to +125 50-80 RoHS

C: SPDT-CO Glass DRT-DTH 39.67 [1.562] 85.73 [3.375] 50 500 Vdc, 350 Vac 1.5 Adc, 1.0 Aac 0.5 -20 to +125 50-80 RoHS

Notes:

For details on electrical speciﬁcations, visit hamlin.com

A:SPST-NO - Single Pole Single Throw - Normally Open

C:SPDT-CO - Single Pole Double Throw - Change Over

Applications Assistance and Custom Switch Modiﬁcation

Littelfuse offers complete application engineering assistance in selecting the correct switch,

sensitivity, and conﬁguration. Switch life is affected by electrical load and other operating

conditions. Hamlin offers load / life information per customer request.

Lead Modiﬁcations

Littelfuse can cut and/or form the reed switch leads to meet your dimensional requirements.

Most lead modiﬁcations can be done by Hamlin with no additional tooling costs.

littelfuse.com | hamlin.com

NOTE:

This tool should ONLY be used as a quick reference guide to suggest a starting point in the selection

process. Once a part has been selected, the designer should retrieve the actual datasheet from

Hamlin.com / Littelfuse.com.

Littelfuse always recommends conducting application testing to verify the correct part selection.

In order to use this quick reference guide, the designer has to know just a few of key parameters,

such as switching power, voltage, current, size, mounting method, and safety certiﬁcations.

Market Segments / Applications:

Reed switches are used in a number of market applications including, but not limited to:

• White goods and small home appliances, such as ﬂuid level and position sensors

• Gas and water metering such as tamper switch and pulse counting

• Safety and security, such as electronic door locks, window/door sensors, and

smokealarms

• Others, such as ﬁtness equipment, electronic shelf labeling, solar trackers, and

equipment for hazardous environments

Visit us at hamlin.com for assistance with application solutions.

MITI-7 MDSR-10 MDSR-7 FLEX-14 MDCG-4 MACD-14 HA15-2 MLRR-4 MLRR-3

This compact reed switch is

somewhat more expensive

than larger parts. It is typically

used only when minimizing

component size is critical.

This switch is also available

in surface-mount* packaging

as the MISM-7R (Tape & Reel)

and MISM-7B (Bulk Pack).

This cost-effective, small

reed switch is also available in

surface-mount* packaging as

the MDSM-10R (Tape & Reel),

the MDSM-10B (Bulk Pack),

and the 59170 (overmolded*).

This small reed switch is only

slightly larger than the MITI-7

and MDSR-10 switches, but

with the same small glass

diameter as those switches.

The MDSR-7 switch is also

available in an overmolded*

PCB-mount package, including

surface-mount* packaging, as

the 59165 and 59045.

The FLEX-14’s leads are easily

formed or bent to meet an

application’s requirements.

In addition, its slightly shorter

glass length and slightly

longer lead length provide high

ﬂexibility when designing it

into products.

The MDCG-4 is one of Hamlin’s

most popular reed switches

and is available in a wide

range of sensitivities. It is also

available in an overmolded*

PCB-mount package as the

59050, and in surface-mount*

packaging as the MDSM-4R

(Tape & Reel) and MDSM-4B

(Bulk Pack).

The MACD-14 has low

hysteresis between activate

(closure) and deactivate

(opening). This is also known

as close differential. This

feature can be an advantage

in some sensing applications.

One such example is when

the activating magnet travel

distance is limited. It is also

available in surface-mount*

packaging as the MASM-14R

(Tape & Reel) and MASM-14B

(Bulk Pack).

The HA15-2 is physically very

similar to the MDCG-4, but it

uses a pressurized nitrogen

atmosphere that allows

switching 240 Vac power line

mains voltages. The HA15-2

also provides good switching

life on non-suppressed

inductive loads, as well as less

demanding ones. It is available

in a wide variety of Hamlin

sensor packages.

The MLRR-4 has the smallest

hysteresis between activate

and deactivate (close

differential). This can be an

advantage in some sensing

applications, but it can also

be a disadvantage in sensing

applications where the magnet

is moving slowly. The MLRR-4

is well suited to switching

small incandescent lamps (< 28

V, < 0.2 A). This switch is also

available in surface-mount*

packaging as the MLSM-4R

(Tape & Reel) and MLSM-4B

(Bulk Pack).

This reed switch has the

longest wire leads of any of

the 15.24 mm / 0.600 inch glass

length switches. The MLRR-3

is a cost-effective, small 20

Watt switch. It provides good

switching life on a wide range

of loads. It is also available in

surface-mount* packaging as

the MLSM-3R (Tape & Reel)

and MLSM-3B (Bulk Pack).

*See other side for product image and speciﬁcations.

MARR-5 MRPR-3 MRPR-8 MDRR-DT DRR-129 DRR-DTH and DRT-DTH

The MARR-5 has advantages in high voltage and low temperature applications

because its electrical contacts are in a vacuum instead of a nitrogen atmosphere.

The voltage ratings are 1000 Vdc switching and 2000 Vdc breakdown (see data sheet

for additional information). The switch is rated at a rather high 35 AT (Ampere-turn)

in order to meet the 1000 Vdc switching voltage at low currents (< 10 mA). If a higher

switching current or RC arc suppression is used, it’s possible to realize a higher

switching voltage or lower switch AT value. Contact Hamlin for recommendations.

As the switch AT increases (sensitivity decreases), the contact gap increases,

resulting in increased voltage capability. Typical breakdown voltage is 100 times the

AT value. In addition, the MARR-5 can be used at temperatures near absolute zero if

carefully packaged. For additional information, see Hamlin Application Note AN105 –

Extreme Temperature Reed Switch Operation.

The MRPR-3 is very good at switching

relatively high power loads up to 50

W, 200 Vdc, 140 Vac, 1.5 Adc, 1.1 Aac,

including inductive loads with or without

an inrush current.

The MRPR-8 uses a pressurized nitrogen

atmosphere that allows switching 240

Vac power line mains voltages and

higher power levels than the HA15-2.

This is a single-pole, double-throw

(SPDT) reed switch, also known as a

Form C reed switch. The addition of a

normally closed contact to the standard

normally open contact meets the needs

of a wide variety of applications. It is

not unusual for the normally closed

contact to be the only contact used in

an application. However, this capability

results in compromises that affect the

switching voltage and current, as well

as cost.

The DRR-129 can offer the highest

electrical contact ratings of any of

Hamlin’s reed switches because of its

large wire diameter and large contact

gap. However, these characteristics can

also represent disadvantages in terms of

size, cost, and low magnetic sensitivity.

For some applications, however, the

DRR-129’s 100 W, 400 V, 3 A switching

capability can be essential.

Like the MDRR-DT, the DRR-DTH and

DRT-DTH are single-pole, double-throw

(SPDT) reed switches. Their large size

provides higher electrical performance

but also increases their cost. The

DRR-DTH uses a contact coating similar

to many of Hamlin’s reed switches.

The DRT-DTH uses a tungsten contact

coating that is very good on heavy loads;

however, it tends to increase contact

resistance when switching light loads

such as < 0.25 A, < 6 V.

HAMLIN REED SWITCH SELECTION GUIDE

A quick reference guide to selecting reed switches for electronic applications

Littelfuse electronics product portfolio includes: littelfuse.com | hamlin.com

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Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Littelfuse:

59050-1-V-00-0 59050-1-U-00-0 MDRR-DT 15-25 U MDRR-DT 20-30 U MDRR-DT 20-25 F MDRR-DT 20-25 U

MDRR-DT 15-30 F MDRR-DT-15-30-U MDRR-DT 20-30 F MDRR-DT 15-20 U MDRR-DT 30-35 U MDRR-DT 15-25

F MDRR-DT 15-20 F 59050-1-T-00-0 MDRR-DT-30-35-U MDRR-DT-20-25-F MDRR-DT-15-20-F 59050-1-S-00-0

MDRR-DT-15-25-F MDRR-DT-10-15-F MDRR-DT-10-15-U MDRR-DT-20-35-F MDRR-DT-15-25-U MDRR-DT-20-30-

U MDRR-DT-15-20-U MDRR-DT-20-25-U MDRR-DT-20-30-F MDRR-DT-15-30-F