Entropy Source Module for TRNG Systems

Product Specifications

Technical details and manufacturing context for Entropy Source Module

Definition

The entropy source module is a critical component within a True Random Number Generator (TRNG) system that captures unpredictable physical phenomena (such as thermal noise, quantum effects, or atmospheric noise) and converts them into raw entropy signals. It serves as the foundation for generating truly random numbers that are essential for cryptographic security, secure communications, and other applications requiring high-quality randomness. The module typically uses physical processes (e.g., thermal noise from resistors, avalanche breakdown in diodes, or quantum effects) to produce analog noise signals. These signals are amplified, filtered, and digitized to create a stream of raw random bits that exhibit statistical randomness and unpredictability. This component is designed for integration into electronic systems, with a compact package size ranging from 5 to 20 mm and a weight of 1 to 10 g, suitable for PCB mounting. It operates over a supply voltage of 3.3 V DC ±5% and consumes between 0.1 and 1.5 W, making it adaptable to various power budgets. The output bit rate ranges from 1 to 100 Mbps, with an entropy per bit of 0.999 to 1.0 bit, meeting the requirements of NIST SP 800-90B for cryptographic applications. The module supports multiple output interfaces (SPI, I2C, UART) to accommodate different host controllers. Environmental specifications include an operating temperature range of -40 to 85 °C and a storage temperature range of -55 to 125 °C, with relative humidity up to 95% non-condensing. The ingress protection rating varies from IP40 to IP67, depending on the enclosure. Materials include a semiconductor substrate, resistive elements, and a protective casing. Certifications such as FCC, CE, and RoHS may be required for market access, but verification with the manufacturer is necessary. This directory entry provides reference ranges; actual values must be confirmed for the specific model and application.

Working Principle

The module captures physical noise from sources like resistor thermal noise or diode avalanche breakdown. The analog signal is amplified and filtered to remove unwanted frequencies, then digitized by an ADC to produce raw bits. These bits are statistically random and unpredictable, forming the entropy source for a TRNG. The design ensures that the entropy per bit is near 1.0, as required for cryptographic use.

Common Materials

Semiconductor substrate, Resistive elements, Protective casing

Technical Parameters

Parameter	Typical range	Notes & selection driver
Output Bit Rate	1–100 Mbps	Higher rates require faster sampling and more entropy sources.
Entropy per Bit	0.999–1.0 bit	Must be near 1 for cryptographic use.NIST SP 800-90B
Supply Voltage	3.3 ±5% V DC	Outside range may cause unstable operation.
Power Consumption	0.1–1.5 W	Lower power for battery-powered devices.
Operating Temperature	-40–85 °C	Extended range may require derating.
Storage Temperature	-55–125 °C	Non-operating condition.
Relative Humidity	5–95 % RH	Non-condensing.IEC 60068-2-78
Ingress Protection	IP40–IP67	Higher IP for harsh environments.IEC 60529
Output Interface	SPI, I2C, UART	Select based on host controller.
Package Size	5–20 mm	Footprint for PCB integration.
Weight	1–10 g	Affects mechanical design.
Certification	FCC, CE, RoHS	Required for market access.

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

Noise Generator
Produces the raw physical noise signal using semiconductor or quantum effects

Material: Semiconductor materials
Signal Amplifier
Amplifies the weak noise signals to usable levels while maintaining signal integrity

Material: Integrated circuit components
Analog-to-Digital Converter
Converts the amplified analog noise signals into digital random bits

Material: Semiconductor substrate with ADC circuitry
Thermal Management Part
Maintains stable operating temperature to ensure consistent entropy quality

Material: Heat sink materials

Applied To / Applications

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

True Random Number Generator

View system integration details

Manufacturers of Entropy Source Module

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Frequently Asked Questions

What is the typical output bit rate of an entropy source module?

The output bit rate typically ranges from 1 to 100 Mbps, depending on the model and sampling configuration. Higher rates require faster sampling and may need multiple entropy sources. Confirm the specific rate with the manufacturer.

What standards apply to the entropy per bit?

For cryptographic use, the entropy per bit should be near 1.0 bit. NIST SP 800-90B provides guidelines for evaluating entropy sources. The reference range is 0.999 to 1.0 bit, but actual compliance must be verified with the manufacturer.

What output interfaces are available?

Common interfaces include SPI, I2C, and UART. The choice depends on the host controller's capabilities. Ensure compatibility with your system's communication protocol.

What environmental conditions can the module withstand?

Operating temperature ranges from -40 to 85 °C, storage from -55 to 125 °C, and relative humidity up to 95% non-condensing. Ingress protection varies from IP40 to IP67. Always verify these ratings for your specific model.

Data Basis

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

Preliminary Technical Classification

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humidity:	0-95% non-condensing
pressure:	0.5 to 1.5 atm
vibration:	Up to 5g RMS
temperature:	-40°C to +85°C

Entropy Source Module

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

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