PASSIVE SOLUTIONS

Smallest Sealed Trimmer for Medical Applications

The Bourns® Trimpot® 3312 is 2mm in size and the smallest sealed trimmer available for medical applications.



Bourns has supplied the medical industry with quality, dependable and cost-effective products for more than 40 years. Its Trimpot products find use in patient diagnosis applications, such as equipment for diagnostic and imaging, emergency and patient monitoring, automated infusion, injection and liquid dispensing, patient care, mobility, therapy and surgical.

The Bourns Trimpot family features reliable, high quality trimmers of various sizes with options such as low resistance, tight tolerances and special testing. The 3312 model is a 2mm sealed, single turn trimming potentiometer that saves space in circuit boards and provides high reliability. Although miniature in size, its performance excels. A like for like comparison of the 3312 versus its 2mm open frame counterpart clearly shows the 3312’s superior performance (see table).

For designs requiring a miniature device with a precise, low total resistance, model 3312 is currently the only 2mm trimmer available and offers 10Ω, 20Ω and 50Ω total resistance values. The robust construction equips model 3312 for use in high reliability applications.

In addition to the 2mm 3312, there are 3mm, 4mm and 6mm Trimpot models, 3313, 3314 and 3316, respectively. All are sealed, surface mount, single turn models that can withstand water washing processes.

Comparison of 3312 with Equivalent Open Frame Device

Feature	3312	Open Frame
Resistance Range (MΩ)	10 to 1	200 to 1
Temperature Range (°C)	-55 to +125	-40 to +105
Temperature Coefficient (ppm/°C)	100	250
Rotational Cycles	25	10
Sealing Method	85°C Flourinert®	-

Features

• Humidity: MIL-STD 202 Method 106; TRS ±5%, IR 10MΩ
• Vibration: 20G TRS ±1%; VRS ±1%
• Shock: 100G TRS ±1%; VRS ±1%
• Thermal Shock: 5 cycles, TRS ±2%; VRS ±4%
• Adjustability:
  • Voltage Divider: ±0.4%
  • Rheostat: ±0.8%

Applications

• Diagnostic and imaging
  • Magnetic resonance imaging
  • Computer assisted tomography
  • Sonogram equipment
• Emergency and patient monitoring equipment
  • Ventilators
  • Anaesthesia delivery systems
  • Defibrillators
  • Infant care equipment
• Patient care
  • Dental chairs
  • Patient beds
  • Hearing aids
  • Physiotherapy devices
  • Mobility equipment
  • Dialysis equipment
• Medication management
  • Infusion pumps
  • Liquid dispensing equipment
• Surgical equipment
  • Surgical beds
  • Radiation treatment
  • Laser and plastic surgery equipment
  • Surgical probes

For further information, including Bourns' 3312 Series Datasheet, please click here