HR256N 250 Ohm 0±.05% T.C. 0±5 PPM .25W Wire Wound Axial Resistor
HR256N 250 Ohm 0±.05% T.C. 0±5 PPM .25W Wire Wound Axial Resistor 

Electrical & Physical Specifications:

A-Length: 9.53 mm (.375")
B-Diameter: 6.35 mm (.250")
Lead Dimensions: .032" D X 1.500" L
Max Watts @ 1% Tol: .25
Max Volts @ 1% Tol: 200
Temperature Range: -65°C. to +125°C.


HR Series Engineering Attributes:

RESISTANCE & TOLERANCES
You can select any Ohmic value or decimal part of an Ohm with tolerances to ±.005%. 10Ω minimum resistance for ±.01% tolerance. See figure #2 shown below.
TCR CHARACTERISTIC
Standard:
100Ω & higher values: 0±5 ppm/°C.
For values below 100Ω: 0±15ppm/°C.
Special:
100Ω & higher: 0±1 ppm/°C. matching to 0±.5 ppm/°C.
Please specify temperature span of operation. The TCR is calculated between +25°C. & +100°C.
POWER VS. AMBIENT TEMPERATURE
All Ultra Precision Resistors are designed for full load based upon ±1% resistance tolerance providing the ambient temperature (+) plus the rise in temperature due to self-heating, does not exceed +125°C. Derated to zero power @ +145°C., See figure #1 shown below.
STABILITY
To ±.001%/yr. @ +25°C. with no Load.
REDUCTION OF THERMAL EMF USING COPPER TERMINALS:
Less than ±3 microvolts/°C. emitted.
INDUCTANCE
Non-inductive balanced reverse pi windings are standard for the HR series with the exception of the HR103.
PROTECTIVE SEAL
Features a stress free base coat as well as an epoxy casing that is resistant to solder heat & solvents.
MARKING
PRC stamp, part type & name, Ω value & tolerance, physical size permitting.
 

Type HR Derating Table*
 
For ±1% resistance tolerance apply up to 100% of rated power to +125 Degrees Celsius. derated to zero @ +145 Degrees Celsius.

For ±½% resistance tolerance apply up to 75% of rated power to +125 Degrees Celsius. derated to zero @ +140 Degrees Celsius.

For ±¼% resistance tolerance apply up to 50% of rated power to +125 Degrees Celsius. derated to zero @ +135 Degrees Celsius.

For ±0.1% resistance tolerance apply up to 50% of rated power to +125 Degrees Celsius. derated to zero @ +135 Degrees Celsius.

For ±0.05% resistance tolerance apply up to 35% of rated power to +125 Degrees Celsius. derated to zero @ +132 Degrees Celsius.
 
* Percent of Rated Power vs. Combined Temp. of Self-Heating and Ambient (in °C.).

CAN'T FIND THE PART TO MATCH YOUR SPECS?

Then let PRC custom manufacture your wire wound resistor, sensor, or shunt with some of the shortest lead times in the industry. Engineering samples can be supplied at no cost to you in 7-10 days for most jobs. Computer tracking charts are available for reference with certain part types. If you need a specific marking on your part(s) we will custom print your order with the marking you desire & at no additional cost to you. If needed, you can interchange the size, shape, lead dimension, wattage, voltage, current, Ω value, tolerance, & TCR characteristics with most part types. Visit our Ultra-Precision HR Series & see if one of our other parts from the same series will satisfy all your requirements. If you still do not find a part that meets the exact specifications your application requires, simply follow the link Contact/Request For Quote & fill in all known spec fields. One of our highly trained engineers will review your objectives and see if we can modify one of our standard parts to satisfy all your requirements. If you are unsure how to accurately complete this form, give us a call & someone from our sales department will be more than happy to assist you.

ORDERING PROCEDURE

To order this part from stock simply click Virtual Store Ultra Precision HR Series and select the specific product you wish to purchase & the desired quantity by clicking on the arrow underneath the word quantity. This will unfold a drop down menu allowing you to select the quantity you wish to order. Once you have chosen the quantity you wish to receive, simply click the Add to Cart button shown at the bottom of the quantity selection page to receive further instructions. If you wish to order larger quantities than allowed or if the part you need is not featured in our virtual store, our sales department is available to provide price, delivery, lead time & all other pertinent ordering instructions to companies within the U.S.A. If you wish to place an order in the United States, simply give us a call & ask for the Sales Department, our contact information is at the very top of every page. For companies outside the U.S.A., we have sales representatives in over 30 different countries to assist you. Click the International Sales Representative Map to locate the sales representative nearest to your region & view their contact information. Our international sales representatives are readily available & eager to answer all inquiries regarding pricing, lead time, & ordering instructions as well as any other questions you may have.

Detailed Images
Derating Information

Derating Information




Minimum Resistance vs. Tolerance

Minimum Resistance vs. Tolerance




 

Details
 
SKU HR256N 250 Ohm 0±.05%
Type Axial
Length 9.53mm (.375")
Lead Dimensions .032" dia. X 1.500" long
Diameter 6.35mm (.250")
TCR Char. 100Ω & higher: 0±5ppm, Special to 0±1ppm /°C. Below 100Ω 0±15ppm/°C.
Temperature -65°C. to +125°C.
Resistance from .1Ω to 200KΩ
Tolerance ±.01% (std.) ... from ±1% to ±.005%
Stability to ±.001% per year
Max Watts .25
Max Volts 200
Lead Free No



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