Editorial Technical Reference

Current source cell

This page explains how Current source cell is classified within Computer, Electronic and Optical Product Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A fundamental electronic component that generates and regulates a constant current output within a resistor network or current source array.

Product Specifications

Technical details and manufacturing context for Current source cell

Definition
A current source cell is a discrete electronic circuit element designed to produce a stable, controlled current output independent of load variations. Within a resistor network or current source array, it serves as the basic building block that can be combined in parallel or series configurations to achieve specific current distribution patterns, precision current sourcing, or programmable current outputs for applications such as sensor biasing, LED driving, analog signal processing, and reference current generation. The cell typically integrates active semiconductor components, such as transistors or operational amplifiers, with feedback mechanisms to maintain a constant current through a load. It compares the actual output current against a reference, often set by a precision resistor or voltage reference, and adjusts its internal circuitry to correct any deviations, ensuring stable current delivery regardless of load impedance changes or supply voltage fluctuations. Key parameters include an output current range of 0.1–100 mA (adjustable), current accuracy of ±0.5% at 25°C, supply voltage range of 3.3–36 V DC, voltage drop of 0.5–2.5 V at maximum output current, operating temperature range of -40 to 85°C (industrial grade), temperature coefficient of ±50 ppm/°C, load regulation of ±0.1% for load change 10–90%, line regulation of ±0.05%/V, output noise ≤10 µVrms (10 Hz–100 kHz), operating humidity 5–95% RH (non-condensing), and ESD rating of ±2 kV (HBM, per IEC 61000-4-2). Available package types include SOT-23 and SOIC-8, with other packages on request. The cell is constructed using semiconductor silicon, copper, epoxy resin, and gold bonding wire. This directory entry provides reference values; verify model-specific specifications and standards with the legal manufacturer or supplier before procurement.
Working Principle
The current source cell operates by using active semiconductor components, typically transistors or operational amplifiers, with feedback mechanisms to maintain a constant current through a load. The cell compares the actual output current against a reference, often set by a precision resistor or voltage reference, and adjusts its internal circuitry to correct any deviations. This ensures stable current delivery regardless of load impedance changes or supply voltage fluctuations. The feedback loop continuously monitors the output and makes real-time corrections, providing a regulated current that is independent of external variations.
Common Materials
Semiconductor silicon, Copper, Epoxy resin, Gold bonding wire
Technical Parameters
ParameterTypical rangeNotes & selection driver
Output Current Range0.1–100 mAAdjustable within range
Current Accuracy±0.5 %At 25°C, typical
Supply Voltage Range3.3–36 V DCDepends on output current
Voltage Drop0.5–2.5 VAt max output current
Operating Temperature Range-40–85 °CIndustrial grade
Temperature Coefficient±50 ppm/°CTypical
Load Regulation±0.1 %For load change 10–90%
Line Regulation±0.05 %/VFor supply variation
Output Noise≤10 µVrms10 Hz–100 kHz
Package TypeSOT-23, SOIC-8Other packages on request
Operating Humidity5–95 % RHNon-condensing
ESD Rating±2 kVHBMIEC 61000-4-2

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Reference resistor Part
    Sets the precise current value through voltage-to-current conversion
    Material: Thin-film nichrome or precision metal alloy
  • Current mirror transistors Part
    Replicates and scales the reference current to the output
    Material: Bipolar or CMOS semiconductor silicon
  • Feedback amplifier
    Monitors output current and adjusts drive to maintain constant current
    Material: Semiconductor silicon with metal interconnects
  • Output transistor Part
    Delivers the regulated current to the external load
    Material: Power semiconductor silicon with copper heat spreader

Application & selection

Application Fit & Sizing Matrix

Operational Limits
pressure: Not applicable (solid-state component)
other spec: Current regulation accuracy: ±0.5% to ±5% of set value
temperature: -40°C to +125°C
Media Compatibility
✓ Printed circuit board assemblies ✓ Semiconductor test equipment ✓ Precision measurement instruments
Unsuitable: High-vibration industrial machinery (risk of mechanical damage to components)
Sizing Data Required
  • Required output current range (e.g., 1mA to 100mA)
  • Supply voltage range (e.g., 5V to 48V)
  • Load resistance range (e.g., 100Ω to 10kΩ)

Risk, maintenance & compliance

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Electrode Degradation
Cause: Electrochemical corrosion and material deposition on electrode surfaces due to prolonged exposure to process fluids, leading to reduced current output and unstable voltage.
Seal Failure
Cause: Thermal cycling and chemical attack on elastomeric seals, resulting in electrolyte leakage, contamination ingress, and potential short circuits.
Maintenance Indicators
  • Fluctuating output voltage beyond ±5% of nominal value during steady-state operation
  • Visible electrolyte leakage or corrosion deposits around terminal connections and housing seams
Engineering Tips
  • Implement regular electrode cleaning cycles using manufacturer-approved solutions to prevent performance-degrading deposits
  • Maintain environmental controls to keep operating temperature within ±10°C of design specification and humidity below 60% RH

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ASTM A370 Standard Test Methods and Definitions for Mechanical Testing of Steel Products CE Marking for Machinery Directive 2006/42/EC

Quoted from the published standard.

Manufacturing Precision
  • Bore Diameter: +/-0.02mm
  • Surface Flatness: 0.1mm per 100mm
Quality Inspection
  • Dye Penetrant Testing for Surface Defects
  • Spectrographic Analysis for Material Composition
Technical documentation
Request current drawings, revision history, and a signed specification sheet.
Manufacturing capability
Verify equipment lists, process limits, capacity, and representative production evidence.
Inspection readiness
Confirm test methods, calibrated equipment, sampling plans, and traceable reports.
Supplier transparency
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Manufacturers of Current source cell

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Frequently Asked Questions

What is the output current range of this current source cell?

The output current range is 0.1 to 100 mA, adjustable within that range. However, the exact adjustable range may depend on the specific model and configuration. Always verify with the manufacturer's datasheet.

What is the typical current accuracy?

The typical current accuracy is ±0.5% at 25°C. This is a reference value; actual accuracy may vary with temperature and operating conditions. Confirm with the supplier.

What is the operating temperature range?

The operating temperature range is -40 to 85°C, industrial grade. This indicates the ambient temperature range within which the component is designed to operate. Verify for your specific application.

What package types are available?

Standard package types include SOT-23 and SOIC-8, with other packages available on request. The package type affects mounting and thermal performance. Check with the manufacturer for availability.

Related equipment

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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