MARL 203 Technical data

PART NUMBER COLOUR LENS VOLTAGE CURRENT LUMINOUS WAVE OPERATING STORAGE

DC DC INTENSITY LENGTH TEMP TEMP
Vopr lopr lv@20mA λp Topr Tstg

203-301-21-38 Red Water Clear 12 20 900 660 -40 ~ +85^ -40 ~ +85 Yes

203-325-21-38 Yellow Water Clear 12 20 4300 590 -30 ~ +85^ -40 ~ +120 Yes

203-324-21-38 Green Water Clear 12 20 7800 525 -30 ~ +85^ -40 ~ +100 Yes

203-934-21-38 Blue Water Clear 12 20 2300 470 -30 ~ +85^ -40 ~ +100 Yes

203-998-21-38 Cool White Water Clear 12 20 4600 *see below -30 ~ +85^ -40 ~ +100 Yes

203-991-21-38 Warm White Water Clear 12 20 2300 **see below -40 ~ +95^ -40 ~ +100 Yes

203-301-23-38 Red Water Clear 24-28 20 900 660 -40 ~ +85^ -40 ~ +85 Yes

203-325-23-38 Yellow Water Clear 24-28 20 4300 590 -30 ~ +85^ -40 ~ +120 Yes

203-324-23-38 Green Water Clear 24-28 20 7800 525 -30 ~ +85^ -40 ~ +100 Yes

203-934-23-38 Blue Water Clear 24-28 20 2300 470 -30 ~ +85^ -40 ~ +100 Yes

203-998-23-38 Cool White Water Clear 24-28 20 4600 *see below -30 ~ +85^ -40 ~ +100 Yes

203-991-23-38 Warm White Water Clear 24-28 20 2300 **see below -40 ~ +95^ -40 ~ +100 Yes

UNITS Vdc mA mcd nm

0

C

0

C

l

Direct replacement for T1¼ Bi-Pin

l

Flat-topped for enhanced, even illumination of
large lens areas

l

Improves equipment reliability

l

‘Fit & Forget’ reliability

l

Warm White LEDs may be used behind coloured lens
as a true replacement for a filament lamp

FILAMENT REPLACEMENT LEDs - T1¼

Ordering Information & Typical Technical Characteristics (Ta = 25°C)

Mean Time Between Failure = 100,000 Hours. Luminous intensity figures refer to the unmodified discrete LED.

FEATURES

SPECIFICATIONS

203 SERIES

PACK QUANTITY = 20 PIECES

SAMPLES AVAILABLE

© MARL

INTERNATIONAL LTD 2007 : DS 091/06 Issue 2

Page 1 of 3

How to Order:

website: www.marl.co.uk•email: [e-mail]

•

•

Telephone [phone]•Fax: [phone]

The information contained in this datasheet does not constitute part of any order or contract and should not be regarded as a representation
relating to either products or service. Marl International reserve the right to alter without notice the specification or any conditions of supply
for products or service.

HIGH INTENSITY

Please note that this product is also available in different voltages. Contact our sales

department for further details.

^ = Products must be derated according to the derating information. Each derating graph refers to

specific LEDs. Appropriate LED numbers shown. - Refer to page 3.

998 *Typical emission colour cool white
x 0.296 0.283 0.330 0.330
y 0.276 0.305 0.339 0.318

991 **Typical emission colour warm white
x 0.3610 0.3541 0.4588 0.5080
y 0.3900 0.3401 0.3838 0.4720

Intensities (lv) and colour shades of white (x,y co-ordinates) may vary between LEDs within a batch.

203 Series

BS EN ISO 9001:2000
Approved Manufacturer

SAMPLES AVAILABLE

© MARL

INTERNATIONAL LTD 2007 : DS 091/06 Issue 2

Page 2 of 3

How to Order:

website: www.marl.co.uk•email: [e-mail]

•

•

Telephone [phone]•Fax: [phone]

The information contained in this datasheet does not constitute part of any order or contract and should not be regarded as a representation
relating to either products or service. Marl International reserve the right to alter without notice the specification or any conditions of supply
for products or service.

Dimensions in mm (Typical)
Not to scale

Resistor lead signifies positive termination +ve.
Colour dot on product denotes LED colour

TECHNICAL INFORMATION

Lamp Base Style Series Metric Equivalent (mm) Maximum Power Dissipation (mW)

Sub-Miniature Bi-Pin T1¼ 203 4 500

DESIGN CONSIDERATIONS

Single-Chip LEDs

All devices feature water clear high intensity LEDs as standard. The single chip LED devices have been modified by the removal of the domed
portion of the encapsulation (flat-topped) to provide even illumination of switches and annunciators. Non flat topped versions are also available,
please contact the sales department for details.

Product Evaluation

Filament Replacement LEDs have been specifically designed to meet the primary objective of providing improved reliability. As this product range
is suitable for both new-build and retro-fit, (sometimes in very old systems), a wide range of illuminated push button switches and lamp holders
can be encountered. Due to subjectivity, evaluation of the LED type is recommended, (samples of all standard models are available). Care should
be taken to correctly simulate operating ambient light conditions to ensure that the correct device has been selected to maximise viewing
characteristics such as viewing angle, colour compatibility and on/off contrast ratio.

Electro-st

atic Discharge (ESD)

Build up of electro-static discharge occurs in many situations involving people moving and handling products. The range of possible situations is
very diverse but voltage levels as high as several thousand volts can and do arise in many individual situations. When an operator charged up to
these levels handles a ‘static sensitive device’, there is a very probable likelihood that the device will be irreversibly damaged. It is essential that
precautions are taken at all stages during manufacture and assembly of these products. Although LEDs were never considered to be static
sensitive devices, changes in manufacturing technology and materials used to produce higher intensity products over a large range of the
wavelength spectrum have changed this. Marl has an approved system of ESD control from goods in, through production and into final packing
and despatch. We recommend all users of LED based products follow the guidelines of BS 100015.

Power de-rating

The forward voltage/current value of an LED is dependant upon the ambient temperature of the environment in which it is operated. Therefore,
care must be taken to operate the LED at the correct voltage/current values, depending upon the ambient temperature. Consequently, a
recommendation regarding operating voltages and currents is given in order to address these temperature effects. This recommendation is
termed ‘de-rating’.

It is usual for forward voltages and currents to be specified for ambient temperature of 25°C. However, because the values of these qualities vary
with temperature, Marl should be contacted if the device is to be operated at a temperature significantly higher than 25°C.

Marl accept no liability for any product that is operated higher than the stated voltage.

Note: All luminous intensity figures refer to the unmodified discrete LED.