HP / Agilent 4156C Precision Semiconductor Parameter Analyzer

The HP/Agilent 4156C Precision Semiconductor Parameter Analyzer delivers high-resolution DC electrical characterization of semiconductor devices and components. Built around four High Resolution Source Monitor Units (HRSMUs), it performs precise voltage, current, and resistance measurements across ultra-wide dynamic ranges. The instrument enables IV and CV characterization, ultra-low leakage measurement, and on-wafer reliability testing—essential capabilities for device development, process qualification, and production validation in semiconductor laboratories.

## Technical Specifications

### Source Measure Units

Standard configuration includes four HRSMUs with independent force, sense, and guard terminals per channel. Current measurement range spans 1 fA to 100 mA with resolution to 0.01 fA at the 10 pA range. Voltage sourcing reaches 2 µV to 100 V with measurement resolution of 0.2 µV. Optional expander modules support Medium Power SMUs (10 fA/2 µV to 100 mA/100 V) and High Power SMUs (10 fA/2 µV to 1 A/200 V).

### Measurement Capabilities

Performs high-resolution DC and pulsed IV measurements, quasi-static CV analysis, and ultra-low leakage characterization. Built-in stressing modes enable on-wafer reliability testing. Material evaluation and process development benefit from measurement resolution approaching 1 fA and 0.2 µV across all channels.

### Compliance & Accuracy

Voltage compliance ranges from 0 V to ±100 V on standard SMUs, extending to ±200 V with HPSMU. Current compliance spans ±1 pA to ±1 A depending on module configuration. Voltage measurement accuracy for HRSMU reaches ±(0.01% + 200 µV) on the ±2 V range. Current measurement accuracy specification varies by range, with typical values at ±(0.02% + 20 fA) for voltage-dependent ranges.

## Key Features

• Full Kelvin connectivity on each HRSMU minimizes lead resistance error
• Six-digit display resolution across all current ranges
• Voltage-dependent current limits: 100 mA at Vout ≤ 20 V, scaling appropriately for higher compliance voltages
• Current-dependent voltage limits: 100 V compliance at Iout ≤ 20 mA
• Expandable architecture via Agilent 41501B for mixed SMU configurations

## Typical Applications

• Diode and transistor characterization
• Leakage current profiling at sub-picoampere levels
• Device reliability and stress testing
• Process window qualification
• Material property evaluation

## Compatibility & Integration

Accepts optional High Power and Medium Power SMUs through the 41501B expander module, allowing mixed-capability configurations tailored to specific measurement requirements.