4B04B-501-500 Bourns Inc., 4B04B-501-500 Datasheet - Page 2

• Manufacturer Part Number: 4B04B-501-500
• Description: Resistor Networks & Arrays 4PIN 50ohms 2 Matched Resistors
• Manufacturer: Bourns Inc.
• Type: Networkr
• Series: 4Br

Specifications of 4B04B-501-500

• Technology: Thick Film
• Resistance: 50Ohm
• Power Rating Per Resistor: 2W
• Number Of Resistors: 2
• Tolerance (+ Or -): 1%
• Circuit Designator: ISOL
• Package / Case: SIP
• Mounting Style: Through Hole
• Temperature Coefficient: ±100
• Military Standard: Not Required
• Operating Temp Range: -55C to 125C
• No. Of Terminals: 4
• Case Style: Molded
• Failure Rate: Not Required
• Termination Style: Pin
• Terminal Pitch: 15.24
• Product Length (mm): 50.08mm
• Product Depth (mm): 2.29mm
• Product Height (mm): 12.7mm
• Product Type: Networks
• Circuit Type: Isolated
• Tolerance: 1 %
• Power Rating: 2 Watts
• Number Of Pins: 4
• Operating Temperature Range: - 55 C to + 125 C
• Dimensions: 12.7 mm W x 2.29 mm H
• Body Material: Alumina
• Lead Free Status / RoHS Status: Not Compliant

Specifications are subject to change without notice.
Customers should verify actual device performance in their specific applications.
by lightning or the switching of power loads. In short, a surge
can be a transient wave of voltage, current or power. Most of the
surge pulse waveforms are unidirectional impulses. Surge wave-
forms occur in many situations, including computer memory dri-
vers and telecommunication equipment. Standards for various
natural surge pulse waveforms in the telecommunication indus-
try are IEC 801-5, ANSI/IEEE C62.41 and Bellcore GR-NWT-
001089. Two consequences of inefficient surge protection in a
system are (1) permanent damage to internal components,
which will require component replacement and (2) temporary
instability to a system, resulting in volatile memory loss in a
computer or other disruptions.
There are various protection devices which guard against surge
overstresses. Typically, a crowbar is used for primary protection,
while current limiters and clamps are used as secondary protec-
tion.
x 1000 microsecond, 0.5 x 700 micro-second, 10 x 700
microsecond, etc. The definition of a 10 x 1000 microsecond is
shown in Figure 2. The first number refers to the voltage rise
time while the second numbers indicate the duration. All of
these surge pulse waveforms consist of energy levels from 10 to
100 Joules.
General Description
Surge is defined as a high-energy, short-duration pulse caused
A typical telecommunication application is shown in Figure 1.
There are several standard telecommunication waveforms - 10
Primary
Protection
Crowbar
(Diverter or Arrestor)
4B04B-50X-RC - Surge Line Protection Modules
Voltage
Over
Entrance
Building
Figure 1. Typical Telecom Application
on Equipment
Line Protection
Network
Current Limiter
(Suppression)
Fuse
Secondary
Protection
(Diverter or Arrestor)
Voltage
Clamp
Over
Ring
Tip
TELECOM
CIRCUIT
a short period of time. Figure 3 shows how the amount of ener-
gy is dependent on the pulse duration and value of the load
resistance. An equation used to determine the amount of energy
transferred to the load by the overstress test waveform can be
given as follows
where RS = source resistance (W)
Line Protection Networks
100
Line protection networks are used to dissipate high energy for
90
50
30
0
FOR EXAMPLE: 10X1000 µSEC WAVE FORM DEFINITION
Energy, W = ________ • ________
t0
RL = load resistance (W)
W = energy (Joules)
t30
OPEN-CIRCUIT VOLTAGE:
DURATION: 1000 µSEC
FRONT TIME: 10 µSEC
1
:
v(t)
t90
DURATION Td
(R
FRONT TIME: 1.67 x (t90-t30) (VOLTAGE)
DURATION: t50-t0
Figure 2. Surge Waveform
S
1
+ R
L
)
R S
(R
S
IMPULSE WAVE
(ANSI / IEEE C62.41 - 1991)
R
+ R
L
L
R L
)
t50
∫
v
2
(t)dt
TIME t