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.
3
Specifications
1145A Dimensions
Bandwidth
1
≥ 750 MHz
RiseTime
1, 2
≤ 470 ps
Attenuation
3
10:1 ± 3%
Input Resistance 1 MΩ ± 2%
Maximum Input
Voltage ± 40 V (dc + peak ac)
Characteristics
Input Capacitance 1.6 pF (typical)
Overshoot ± 10 % for the first 6 ns,
and Ringing
4
± 4% from 6 ns to 20 ms,
± 1.5% thereafter
Output Voltage Offset < ± 10 mV
Input Dynamic Range ±6.0 V
Output Load
Requirement 50 Ω
General Characteristics
Environmental Conditions
Temperature
Operating 0 °C to +55 °C
(32 °F to +131 °F)
Nonoperating –40 °C to +70 °C
(–40 °F to +158 °F)
Humidity
Operating up to 95% relative humidity
(non-condensing) at +40 °C
(+104 °F)
Nonoperating up to 90% relative humidity
at +65 °C (+149 °F)
Altitude
Operating up to 4,600 meters
(15,000 ft)
Nonoperating up to 15,300 meters
(50,000 ft)
Vibration Random vibration 5 to
500 Hz, 10 minutes per
axis, 0.3 grms. Random
vibration 5 to 500 Hz,
10 min. per axis, 2.41 grms.
Resonant search 5 to
500 Hz swept sine,
1 octave/min. sweep rate,
(0.75g), 5 min. resonant
dwell at 4 resonances
per axis.
Power Requirements ±6 V dc ± 2%
(at approximately 180 mA
each supply)
Weight
Net approximately 8 oz
Shipping approximately 1 kg (2.2 lb)
Dimensions Refer to the 1145A drawing
1. Above 35 °C, bandwidth and rise time degrade
approximately
1
/2%/°C .
2. Rise time figure calculated from tr = 0.35/Bandwidth.
3. When connected to an instrument input of 50 Ω,
±0.5%.
4. Oscilloscope characteristics excluded.
Typical Input Impedance vs. Frequency
1M
100k
10k
1k
Magnitude (Ohms)
100
10k 100k 1M 10M 100M 1G
Frequency (Hz)
1145A
10441A
Typical Rise time vs. Input Voltage
700
600
500
400
300
Rise Time (ps)
200
100
0
1
2 3 4 5
Input Step Voltage Amplitude (Volts)
6
13.0 in.
330 mm
3.75 in.
95.25 mm
2.25 in.
57.15 mm
39.0 in.
990.6 mm
8.0 in.
203.0 mm
40.0 in.
1016 mm
Ordering Information
1145A Active Probe
Accessory kit that contains 4 probing pins, 5 SMT grabbers,
2 ground extenders, 2 ground leads with pin-sockets, and 2 red
and 2 black solderable SMT leads. User and Service Guide,
One-year warranty
Available Accessories
16517-8210 Kit with 4 probing pins
5090-4356 SMT grabber kit with 20 grabbers
16517-82105 Ground extender kit with 20 extenders
16517-82106 Ground lead with pin-socket kit with 20 leads
16517-82104 SMT lead kit with 4 red and 4 black leads
Also Available
1142A Probe control and power supply module
Includes: power cord, one-year warranty
Note: Offset and coupling control is not usable with 1145A
01145-68701 Cal kit
Includes: 50 Ω feedthrough termination, SMA adapter
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