51904 \(Clear Lens\)This specification covers the performance requirements for hermetically-sealed red discrete and panel mount light emitting diodes. Two levels of product assurance are provided for each device type as specified in MIL┬ûPRF┬û19500.

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MIL�PRF�19500/519E

6.2 Acquisition requirements. Acquisition documents should specify the following:

Title, number, and date of this specification.

Packaging requirements (see 5.1).

Lead finish (see 3.4.1).

The complete Part or Identifying Number (PIN), see title and section 1.

Specify the PIN for the LED or panel mount assembly as listed below.

JAN1N6092

JAN LED, red, diffused lens.

JANTX1N6092

JANTX LED, red, diffused lens.

JAN1N6609

JAN LED, red, clear lens, sunlight viewable.

JANTX1N6609

JANTX LED, red, clear lens, sunlight viewable.

JANM19500/51901

JAN panel mount, LED, red, diffused lens.

JANTXM19500/51902

JANTX panel mount LED, red, diffused lens.

JANM19500/51903

JAN panel mount, LED, red, clear lens, sunlight viewable.

JANTXM19500/51904

JANTX panel mount LED, red, clear lens, sunlight viewable.

Sunlight viewable � for applications requiring readability in bright sunlight (see 6.5.1).

6.3 Qualification. With respect to products requiring qualification, awards will be made only for products which are,

at the time of award of contract, qualified for inclusion in Qualified Manufacturers List (QML-19500) whether or not

such products have actually been so listed by that date. The attention of the contractors is called to these

requirements, and manufacturers are urged to arrange to have the products that they propose to offer to the Federal

Government tested for qualification in order that they may be eligible to be awarded contracts or orders for the

products covered by this specification. Information pertaining to qualification of products may be obtained from DLA

Land and Maritime, ATTN: VQE, P.O. Box 3990, Columbus, OH 43218-3990 or e-mail vqe.chief@dla.mil. An online

listing of products qualified to this specification may be found in the Qualified Products Database (QPD) at

6.4 Applications. These light emitting diodes are primarily intended for use as visible indicators (ON or OFF) of

status. Intensity is easily modulated by varying the forward current, so the level can be adjusted to suit ambient light

conditions. The modulation rate capability can be high enough to accommodate video signals. Diodes may be

operated in either direct current or pulsed mode depending upon current availability. Pulsed operation is desirable as

a means of linear control of average intensity or of improving the average efficiency (ratio of average intensity to

average current). A panel mount configuration is provided (see figure 2). The panel mount configuration provides

precise and consistent mechanical surfaces for mounting and optical alignment.

6.5 Operating considerations. Under normal ambient light conditions (300 to 1,000 lux), a typical forward current of

6 mA is required to produce an adequate on-state luminous intensity. This current level is directly compatible with

TTL devices, and only simple buffering is needed when operating from LSTTL, LTTL, CMOS. No consideration of

inrush current or keep-alive voltage is necessary. The relative luminous intensity (normalized at 20 mA) is displayed

on figures 3 and 4 for diffused clear, sunlight viewable lens devices.