| product guide | ||||||
|
||||||
| Features | ||||||
|
This series is applied in high-frequency, sharp-impulse circuits. For example, missle detonators, fuel ignition systems, etc. It is capable of completely replacing carbon composition resistors, and compared to carbon composition resistors, this series offers better performance.
|
||||||
| Small in dimension and broad range in high resistance. | ||||||
|
Metal glaze resistor elements provide high stable performance.
|
||||||
| Excellent absorption of electric shock (pulse, surge voltage) | ||||||
| Operating Temperature: -55ºC to 225ºC (extended temp. range to 350ºC available) | ||||||
| Wattage: 1/8 to 4w |
 5th black band identifies part as Pulse Protector |
|||||
| Resistance Tolerance: ±5% | ||||||
| Resistance Range: 100Ω - 1G | ||||||
| Dimensions: (mm) | |||||
| Type No. |
Power Rating @70ºC |
D Max. | L Max. | d | H |
| KR-16 | 1/8W | 3.3 ± 0.5 | 1.9 ± 0.2 | 0.45 ± 0.05 | 28 ± 2.0 |
| KR-25 | 1/4W | 2.3 ± 0.3 | 6.3 ± 0.5 | 0.56 ± 0.05 | 27 ± 2.0 |
| KR-50 | 1/2W | 3.2 ± 0.5 | 9± 0.5 | 0.58 ± 0.05 | 26 ± 2.0 |
| KR-100 | 1W | 4.5 ± 0.5 | 12 ± 1.0 | 0.78 ± 0.05 | 35 ± 3.0 |
| KR-200 | 2W | 5.0 ± 0.5 | 16 ± 1.0 | 0.8 ± 0.05 | 35 ± 3.0 |
| KR-300 | 3W | 6.5 ± 1.0 | 18 ± 1.0 | 0.8 ± 0.05 | 34 ± 2.0 |
| KR-400 | 4W | 8.5 ± 1.0 | 26 ± 1.0 | 0.8 ± 0.05 | 32 ± 2.0 |
|
Rating:
|
|||||||
| Type No. |
Max. Working Voltage |
Max. Overload Voltage |
Dielectric Withstanding Voltage |
Surge Withstanding Voltage | Resistance Range |
||
| ≤ 1MΩ | 1MΩ-6.2MΩ | ≥ 6.8MΩ | |||||
| KR-16 | 250V | 300V | 300V | 2000V | 3000V | 5000V | 100Ω-20MΩ |
| KR-25 | 600V | 700V | 500V | 3000V | 4000V | 6000V | 100Ω-100MΩ |
|
KR-50
|
800V | 1000V | 700V | 4000V | 5000V | 8000V | 100Ω-100MΩ |
|
KR-100
|
1000V | 1400V | 1000V | 5000V | 6000V | 9000V | 100Ω-100MΩ |
| KR-200 | 1000V | 1400V | 1000V | 8000V | 9000V | 10000V | 100Ω-200MΩ |
| KR-300 | 1200V | 1600V | 1000V | 10000V | 11000V | 12000V | 100Ω-200MΩ |
| KR-400 | 6000V | 7000V | 6000V | 13000V | 15000V | 15000V | 100KΩ-1G |
| Performance Specifications | ||||||||||||||||||||||||||||||
| Characteristics |
Test Methods
|
Limits | ||||||||||||||||||||||||||||
|
Temperature Coefficient
JIS-C-5202 5.2 |
Natural Resistance change per temp. ºC
R2: Resistance Value at room temp. plus 100ºC (t2) |
100Ω-1gig <200ppm/ºC
|
||||||||||||||||||||||||||||
|
Short Time Overloadt
JIS-C-5202 5.5 |
Permanent resistance change after application of 2.5 times RCWV for 5 seconds | Resistance change rate is 1% +0.05Ω. No evidence of mechanical damage | ||||||||||||||||||||||||||||
|
Dielectric Withstanding Voltage JIS-C-5202 5.7
|
Resistors shall be clamped in the trough of a 90 metalic v-block and shall be tested at AC potential respectively specified in the table 1, for 60+10/-0 seconds |
No evidence of flashover mechanical damage, arching or insulation break down | ||||||||||||||||||||||||||||
|
Pulse Overload
JIS-C-5202 5.8 |
Resistance change after 10,000 cycles (1 second "on", 25 seconds "off") at 4 times RCWV or the max. pulse overload | Resistance change rate is ±2%+0.05Ω No evidence of mechanical damage | ||||||||||||||||||||||||||||
|
Temperature Cycling
JIS-C-5202 7.4 |
Resistance change after continuous 5 cycles for duty cycle specified below:
|
Resistance change rate is ±5% +0.05Ω No evidence of mechanical damage | ||||||||||||||||||||||||||||
|
Load Life In Humidity
JIS-C-5202 7.9 |
Resistance change after 1,000 hrs. operating at RCWV with duty cycle of (1.5 hrs. "on", 0.5 hrs "off") in humidity test chamber controlled at 40ºC ±2ºC and 90% to 95% relative humidity | Resistance change rate is ±5% +0.05Ω No evidence of mechanical damage | ||||||||||||||||||||||||||||
|
Load Life
JIS-C-5202 7.10 |
Permanent resistance change after 1,000 hrs. operating at RCWV with duty cycle of (1.5 hrs. "on", 0.5 hrs "off") at 70ºC±2ºC ambient | Resistance change rate is ±5% +0.05Ω No evidence of mechanical damage | ||||||||||||||||||||||||||||
|
Terminal Strength
JIS-C-5202 6.1 |
Direct load: Resistance to a 2.5 kgs direct load for 10 seconds in the direction of the longtiduinal axis of the terminal leads. Twist test: Terminal leads shall be bent through 90º at a point of about 6 mm from the body of the resistor and shall be rotated through 360º about the original axis of the bent terminal in alternating direction for a total of 3 rotations | No evidence of mechanical damage | ||||||||||||||||||||||||||||
|
Resistance to Soldering Heat
JIS-C-5202 6.4 |
Permanent resistance change when leads immersed to 3.2 to 4.8 mm from the body in 350ºC ±10ºC solder for 3±0.5 seconds | Resistance change rate is ±5% +0.05Ω No evidence of mechanical damage | ||||||||||||||||||||||||||||
|
Solderability
JIS-C-5202 6.5 |
The area covered with a new, smooth, clean, shiny and continuous surface free from concentrated pinholes. Test temp. of solder: 235ºC ±5ºC Dwell time: 3 ±0.5/-0 seconds | Resistance change rate is ±5% +0.05Ω No evidence of mechanical damage | ||||||||||||||||||||||||||||
|
Continuous Voltage
|
 |
|||||||||||||||||||||||||||||
|
Suirge Withstanding Voltage
|
The following discharge cycle is repeated in the circuit on the left fig. (2.5 sec. "on", 2.5 sec. "off") 10 cycles. Applied voltage DC source.
|
Allowable resistance change ±10% Test circuit: |
||||||||||||||||||||||||||||
|
|||||||||||||||||||||
use R for decimal >100| home page | product guide | TO ORDER PRODUCTS E mail: microohm@vividnet.com Call Toll Free: 1-800-845-5167 |