3059Y-1-500LF Bourns Inc., 3059Y-1-500LF Datasheet - Page 155

• Manufacturer Part Number: 3059Y-1-500LF
• Description: TRIMPOT 50 OHM 1.25"REC CER MT
• Manufacturer: Bourns Inc.
• Series: 3059 - Sealedr

Specifications of 3059Y-1-500LF

• Temperature Coefficient: ±100ppm/°C
• Resistance (ohms): 50
• Termination Style: PC Pin
• Power (watts): 1W
• Tolerance: ±10%
• Number Of Turns: 22
• Adjustment Type: Side Adjustment
• Resistive Material: Cermet
• Mounting Type: Chassis Mount
• Package / Case: Rectangular - 1.250" L x 0.190" W x 0.315" H (31.75mm x 4.83mm x 8.00mm)
• Track Resistance: 50ohm
• No. Of Turns: 22
• Resistance Tolerance: ± 10%
• Power Rating: 1W
• Potentiometer Mounting: Through Hole
• Resistance: 50 Ohms
• Operating Temperature Range: - 55 C to + 150 C
• Element Type: Cermet
• Dimensions: 6.10 mm W x 31.75 mm L
• Product: Trimmers
• Taper: Linear
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

Applications/Processing Guide – Standard and Lead Free
General Guidelines for Guarding Against Component Damage
To minimize temperature shock
To avoid heating components above their maximum rated
temperature
To limit time of exposure above rated temperature
To minimize temperature difference between top and bottom of
board
To reduce temperature shock on entering the moist environment
of the wash
To minimize temperature variations as component travels
through moisture
To minimize exposure to high-pressure water during board wash
Settability
Settability refers to the ease with which a trimmer can be set
accurately to the position that produces the desired circuit
condition.
Where the requirement is for obtaining a highly accurate setting
the preference is for cermet — because a small incremental
adjustment in a wirewound unit does not always produce the
expected change in output as the wiper moves off one turn of
wire and onto another.
Setting accuracy is better with a multiturn unit than with a
single-turn. This is especially true when the speed of setting is
also a requirement as on a production line (Figure 2).
• Pre-heat boards to maximum acceptable level
• Reduce time in solder
• Use lowest acceptable solder temperature
• Use maximum allowable conveyor speed
• Limit pre-heat temperature to maximum necessary
• Limit time in solder
• After solder operation, cool board to wash temperature
• Apply pre-heat to both top and bottom
• Use wash/rinse temperature as near component temperature
• Extend time between solder process and wash
• Cool board after solder operation, prior to entering wash
• Minimize number of wash/rinse and rinse/dry cycles
• Use heated air for air knives (to counter evaporative cooling
• Minimize difference between wash and rinse temperature
• Select trimmer models with pin styles that orient the rotor
before it enters wash
as possible
effect)
seal area away from exposure to the high-pressure water
stream
MV.
MV.
Stability
Stability refers to the ability of the trimmer to remain at the
desired setting. Environmental factors play an important role
here: stability may be affected by temperature exposure, thermal
shock/cycling, humidity, and mechanical shock or vibration.
This is not a matter of concern in most applications, since
Bourns® trimmers exhibit excellent stability under all specified
conditions. Stability is most often a concern when cermet
trimmers are used in low current “dry” circuits (50 uA and
below). Under these conditions the contact resistance may vary,
making the wiper appear unstable. This is most noticeable in
some rheostat applications. This can be avoided by using a
wirewound unit, or choosing a cermet trimmer that has been
designed for dry-circuit applications. Bourns applications
engineers can assist you on this and other questions.
Accessability
When selecting a trimmer and determining its placement on the
board, keep in mind the people who will have to use it. Bourns®
trimmers are available in a wide variety of sizes, shapes,
configurations, and placement of adjustment screws. You will
usually find a unit on which the access for adjustment will be
convenient for the user.
Keep in mind the different requirements for accessibility
depending on whether adjustment will be done on the assembly
line or in the field; with the board uncovered, in a housing or
cabinet, or on an extender. Also consider whether production-
line adjustment will be done manually or by robotics. A Bourns
applications engineer can advise on special high-speed automatic
adjustment features.
400
300
200
500
400
0
SINGLE-TURN SETTABILITY (3386)
1.7
LESS EXPERIENCED
3.4
EXPERIENCED
TECHNICIAN
TECHNICIAN
When accurate setting is required, a multiturn trimmer
SEC.
5.1
can generally be set faster than a single-turn.
6.8
8.5
10.2
Figure 2.
M.V.
M.V.
400
400
0
MULTITURN SETTABILITY (3299)
1.7
LESS EXPERIENCED
3.4
EXPERIENCED
TECHNICIAN
TECHNICIAN
SEC.
5.1
6.8
8.5
153
10.2