SMD Package and Other Support
• Signal-ground pairs with 100-mil
spacing
• 50-mil SOIC and QUAD packages
• 25-mil square pin socket on basic
tip mates with most industry standard IC package adapters
• 25-mil JEDEC, 0.5-mm EIAJ,
0.65-mm EIAJ packages
Instrument Compatibility
• Powered directly by Agilent
Technologies 54520A, 54522A,
54540A, and 54542A oscilloscopes.
• Use the Agilent 1142A external
power supply with any other
instrument with 50 Ω inputs.
Features
• 2 channels per assembly
• dc to 750-MHz probe bandwidth
• 1-MΩ input resistance
• 1.6-pF input capacitance
• 10X attenuation
Agilent 1145A
Two-Channel, 750-MHz, Small-Geometry
Active Probe for Surface-Mount Devices
Data Sheet
2
Surface-mount packages on PC
boards have become the norm rather
than the exception. In the future,
nearly 100 percent of both sides of a
typical PC board will use SMDs. As a
result, bulky probes may become useless as package sizes get smaller and
smaller.
The 2-channel Agilent 1145A provides
easy and reliable connection to SMDs
on PC boards and backplanes, while
delivering active probe performance
down to the tip. Its unique design
also presents a powerful combination
of industry-standard compatibility
and superior reliability. The probe’s
basic contact is a standard 25-mil
square pin socket that houses only
passive circuitry. The active circuitry
is contained in a plastic pod 13 inches
from the tip. This design ensures a
small, lightweight, and rugged tip.
The electrical performance of the
1145A is unmatched by any off-theshelf probe designed for SMD probing. The probe combines high bandwidth, high input resistance, and low
input capacitance. This combination
is superior to that of passive divider
probes that have higher input capacitance because it provides minimal circuit loading at high and low frequencies (see the Impedance vs. Frequency
graph). As signal speeds increase,
passive divider probes don't deliver
the performance needed. This lower
performance can result in waveshapes
that do not represent the actual signal.
The 1145A used with an 54542A
scope, for example, introduces the
equivalent of only
1
/2 of a typical
CMOS gate load (approximately 3.0 pF
per gate) to a CMOS circuit. Other
SMD probes used with comparable
scopes can introduce 1
1
/2 or more gate
loads to the circuit under test.
A versatile set of accessories lets you
probe most any SMD package. The
standard socket also makes the 1145A
compatible with probing adapters
from other vendors for fault-free
probing of SMDs including 5-mil
JEDEC, 0.5-mm EIAJ, 0.65-mm EIAJ
packages.
SMT grabbers provide solid connection to leads with down to 50-mil spacings.
Flexible SMT leads can be soldered to any
convenient signal access point.
Loading...