for In Rush Current Limitation, General Use

Case type and lead type
Superior to the competition in durability and space efficiency

Highly durable case type and Space-efficient lead type
Two types for in-rush current limitation


Rated Voltage : 
100 to 240V
Resistance : 
15 to 100Ω

Resistance value changes at rated voltage

How they work

In-rush current limitation requires a high level of reliability. In these applications, the Posi-R is used in switch parts and parallel connection. When the power circuit is turned on and in-rush current is applied to the Posi-R, this current is quickly contained, thus protecting the secondary electronic equipment. Even during irregularities of continuous application of voltage, the Posi-R provides stability and safety by ensuring a constant temperature.

【Voltage application time and product temperature】

Compared to cement resistors, will not rise in temperature even under continuous current ow.

【Example of circuits used in】

Record on the market

Posi-R is used in lighting product power circuits, which are frequently turned on and off. Posi-R has one of the highest shares* in the Japanese market for thermistors for air conditioner power circuits.

  • As of April 2017; according to Nichicon


  • Unlike cement resistors, these thermistors will not melt or short even when voltage is continuously applied after a switch part breaks down.
  • Space efficient
  • Because the thermistors have recovery properties, they can withstand continuous use.

More space efficient than cement resistors


  • Indoor and outdoor units Applications for commercial air conditioners
  • Indoor and outdoor units for room air conditioners
  • Lighting products for offices
  • EcoCute systems
  • Switching power supplies

Type No.

Case type

( Unit : mm)

Type No. Initial Resistance
(at 25℃)
Max.Operating Voltage
( Vrms )
ZPM0RCH330A250 33Ω±25% 276
ZPR0RCH400A250 40Ω±25%
ZPR0RCH660A250 66Ω±25%
ZPR0RCH750A250 75Ω±25%
ZPR0RCE820A250 82Ω±25%
ZPR0RCE101A250 100Ω±25%

Lead type

Type No. Initial Resistance
(at 25℃)
( Vrms )
Dimensions (mm)
D T F d
ZPC54CH121 120Ω±25% 276 7.8 6 5.0 0.5
ZPC54CH181 180Ω±25% 7.8 6 5.0 0.5
ZPC5JCG121 120Ω±25% 15 6 10.0 0.6
  • For inquiries such as product number selection, please contact your local sales staff
    along with the required specifications, annual planning quantity, etc.

Application Guidelines

Application Guidelines of Positive Thermistors “Posi-R ”

General Observations
  • Do not use”Posi-R” in the presence of oil or water.The parts could fail.
  • Do not apply voltage in excess of the maximum operating voltage.
    This could cause a short circuit or burn out.
  • Do not use “Posi-R” with reactive gas, reducing gas, or oxygen-free environment-electrical characteristics may deteriorate or burn-out may occur.
Notes on Usage
  • Please use the parts within the rated operating temperatures according to the catalog.
  • Please use at maximum operating voltage as specified in the catalog.
  • The surface temperature during operation of “Posi-R” is 100 to 160˚C. Please take into consideration the effect of generated heat around the “Posi-R”
  • Excessive press or shock (ex. drop) should not be applied to the “Posi-R”.
  • Do not apply more lead stress than specified.
  • Do not allow flux to come in contact with “Posi- R”, it may cause failure.
  • The outer resin on the leads may be partially peeled off. This will not affect the function of products.
  • In case of gluing “Posi-R”, the outer resin may be come off, please contact us in this case.
Notes on Storage
  • Packaged parts should be stored under the following conditions :
    temperature : –10 to +40˚C
    humidity :85% or less
  • Storage of “Posi-R” devices may result in increased resistive characteristics.
    They will return to the initial value by applying max. operating voltage prior to using the parts.
  • Shall be used shortly after opening the package. The prolonged exposure to the air may case to deteriorate the solderability.

Lead Shape


( Unit : mm)


Item Symbol Dimensions (mm) Note
Nominal Tolerance
Diameter D Less
- Subject to part DWG
Thickness T - - - Subject to part DWG
Lead dia d - - - Subject to part DWG
Pitch of component P 12.7 25.4 ±1.0
Feed hole pitch P0 12.7 25.4 ±0.3
Hole center to lead P1 3.85 7.7 ±0.7
Feed hole center to component center P2 6.35 12.7 ±1.3
Lead to lead distance F 5.0 10.0 +0.8
Tilt of component ⊿h 0 ±2.0
Tape width W 18.0 +1.0
Hold down tape width W0 12.5 min.
Slip out of hole W1 9.0 +0.75
Slip out of hole down tape W2 3.0 max.
Height of component from tape center H - - Subject to part DWG
Lead wire clinch height H0 16.0 ±0.5
Length of cut lead 1.0 max.
Feed hole diameter φD0 4.0 ±0.2
Total tape thickness t 0.6 ±0.3
Cut length of rejected component L 11.0 max.

Taping specification packaging example

Symbol Dimension
H 230
L 330
W 50,60

Entry Form

Characteristics of Positive Thermistors “Posi-R”


Products Catalog