Agilent
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The Agilent 4155B (HP 4155B) is a semiconductor parameter analyzer designed for DC characterization of devices and materials. The HP 4155B provides four Source/Measure Units (SMUs) for forcing voltage/current and measuring current/voltage. The HP 4155B achieves 10 fA current measurement resolution and 3 pA offset current.[1][2]
Plate 01Agilent 4155B Semiconductor Parameter Analyzer
Plate 02HP 4155B Semiconductor Parameter Analyzer Repairs by Dynamics Circuit (S) Pte. Ltd.
Plate 03HP 4155B Semiconductor Parameter Analyzer #59571
The Agilent 4155B is a semiconductor parameter analyzer used for DC electrical characterization of semiconductor devices. The instrument contains four Source/Measure Units (SMUs) that can force and measure voltage or current. The Agilent 4155B offers a current measurement resolution of 10 fA and a voltage measurement resolution of 1 µV in differential mode. The analyzer supports a maximum output of 200 V and 1 A when configured with an HPSMU expander. The Agilent 4155B includes a zero offset cancel function to improve low-current measurement accuracy.[1][2]
The Agilent 4155B is deployed in semiconductor metrology environments for on-wafer electrical characterization. The instrument is connected to a probe station to contact device pads on wafers or dies. The measurements are used for process development, device design verification, incoming inspection, and reliability assessment.[4][2]
The Agilent 4155B supports a wide range of semiconductor device measurements. Common applications include MOSFET drain current versus gate voltage (Id-Vg) and drain voltage (Id-Vd) sweeps, diode current-voltage characterization, Gummel plots of bipolar transistors, and contact resistance measurements. The analyzer is also used for oxide reliability testing using time-dependent dielectric breakdown (TDDB) methods, evaluation of hot carrier injection degradation, and charge pumping measurements to assess surface state density.[1][2]
| Designation | Generation | Vintage | Changes | Source |
|---|---|---|---|---|
| HP 4156B | — | — | Higher current measurement resolution (1 fA), lower offset current (20 fA), includes Kelvin connections for accurate low resistance measurement, and has a 10 pA lowest current range. | wiki.epfl.ch[2] |
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The Agilent 4155B has a current measurement resolution of 10 fA (femptoampere).[2]
With the HPSMU installed in an expander box, the Agilent 4155B supports output and measurement ranges up to 200 V and 1 A.[2]
Yes, LAN capability is a standard feature on the Agilent 4155B, allowing faster data transfer and file sharing over a network.[2]
The Agilent 4155B is controlled through EasyEXPERT software running on a Windows-based PC.[4]
The following facts about the 4155B are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.
No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the 4155B are on record.
Answerable by: OEM historical records or a trade-press announcement
The control-system platform and OS era of the 4155B are not on record.
Answerable by: an engineer who operated it or OEM installation records
No publicly documented failure modes or field errata for the 4155B are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
The process node or technology generation of the 4155B is not on record.
Answerable by: an OEM datasheet or a fab qualification report
No publicly documented compatible parts, consumables, or accessories for the 4155B are on record.
Answerable by: an OEM parts catalog or a service engineer
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Last updated Sep 30, 2026.