MIL-PRF-39009E (1)

ARMY - CR - US Army Communications Electronics Command

RESISTORS, FIXED, WIRE-WOUND (POWER TYPE, CHASSIS MOUNTED), NONESTABLISHED RELIABILITY, ESTABLISHED RELIABILITY, GENERAL SPECIFICATION FOR

Organization:

ARMY - CR - US Army Communications Electronics Command

Year: 2010

Abstract: This specification covers the general requirements for nonestablished reliability (non-ER), and established reliability (ER), power type, wire wound, fixed resistors which utilize the principal of heat dissipation through a metal mounting surface. These resistors have initial resistance tolerances of ±1 percent. These resistors are capable for continuous full load operation at an ambient temperature of +25°C, and when derated up to +250°C (see figure 1). These resistors should not be used in circuits where their ac performance is of critical importance in the operation of such circuits. However, provisions have been made in particular styles to minimize inductances (see 3.1). These resistors will have life failure rate levels (FRL) ranging from 1.0 percent to 0.001 percent per 1,000 hours (see 1.2.1.4). These FRL are established at a 60 percent confidence on the basis of the life tests. The FRL, identified by the appropriate symbol, is referred to operation at full rated wattage at +25°C, with a permissible change in resistance of ±2 percent as the criteria for failure.Intended Use: Resistors described herein are intended to be used to utilize the principal of heat dissipation through a metal mounting surface. Resistors should not be used in circuits where their ac performance is of critical importance in the operation of such circuits.

URI: http://yse.yabesh.ir/std;query=autho47037D8369B/handle/yse/103434

Subject: Enclosure

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ARMY - CR - US Army Communications Electronics Command

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contributor author	ARMY - CR - US Army Communications Electronics Command
date accessioned	2017-09-04T16:39:45Z
date available	2017-09-04T16:39:45Z
date copyright	40487
date issued	2010
identifier other	BRPUEDAAAAAAAAAA.pdf
identifier uri	http://yse.yabesh.ir/std;query=autho47037D8369B/handle/yse/103434
description abstract	This specification covers the general requirements for nonestablished reliability (non-ER), and established reliability (ER), power type, wire wound, fixed resistors which utilize the principal of heat dissipation through a metal mounting surface. These resistors have initial resistance tolerances of ±1 percent. These resistors are capable for continuous full load operation at an ambient temperature of +25°C, and when derated up to +250°C (see figure 1). These resistors should not be used in circuits where their ac performance is of critical importance in the operation of such circuits. However, provisions have been made in particular styles to minimize inductances (see 3.1). These resistors will have life failure rate levels (FRL) ranging from 1.0 percent to 0.001 percent per 1,000 hours (see 1.2.1.4). These FRL are established at a 60 percent confidence on the basis of the life tests. The FRL, identified by the appropriate symbol, is referred to operation at full rated wattage at +25°C, with a permissible change in resistance of ±2 percent as the criteria for failure.Intended Use: Resistors described herein are intended to be used to utilize the principal of heat dissipation through a metal mounting surface. Resistors should not be used in circuits where their ac performance is of critical importance in the operation of such circuits.
language	English
title	MIL-PRF-39009E (1)	num
title	RESISTORS, FIXED, WIRE-WOUND (POWER TYPE, CHASSIS MOUNTED), NONESTABLISHED RELIABILITY, ESTABLISHED RELIABILITY, GENERAL SPECIFICATION FOR	en
type	standard
page	31
status	Active
tree	ARMY - CR - US Army Communications Electronics Command:;2010
contenttype	fulltext
subject keywords	Enclosure
subject keywords	Heat dissipation
subject keywords	Metal mounting surface
subject keywords	Solderable
subject keywords	Weldable