SSM2212RZ-R7

Overview

The SSM2212RZ-R7 is a dual, NPN-matched transistor pair designed for ultralow noise audio systems. It features an extremely low input base spreading resistance of typically 28 Ω and high current gain exceeding 600 at IC = 1 mA. The device guarantees excellent current gain matching (ΔhFE) to approximately 0.5% and low offset voltage (VOS) of less than 10 μV typical. Key electrical specifications include a maximum noise voltage density of 1 nV/√Hz at 100 Hz, a gain bandwidth product of 200 MHz, and a collector-emitter breakdown voltage of 40 V. It operates within a temperature range of −40°C to +85°C and is housed in an 8-lead SOIC package.

Feature Summary

• Designed specifically for ultralow noise audio applications with minimal input base spreading resistance.
• Provides outstanding signal-to-noise ratios due to high current gain and low noise characteristics.
• Ensures stability of matching parameters through protection diodes across the base-emitter junction.
• Ideal for symmetrically balanced designs that reduce high-order amplifier harmonic distortion.

Applications

• Ultralow noise audio systems
• Symmetrically balanced circuit designs
• Accurate and reliable current biasing circuits
• Current mirroring circuits

Procurement Notes

Verify the component against official Analog Devices documentation to confirm authenticity and revision status. Ensure the ordering suffix matches the required packaging format. Check for RoHS compliance requirements specific to your manufacturing process. Confirm the operating temperature range aligns with your system's environmental constraints before finalizing procurement decisions.

Selection Notes

Select this component when ultralow noise performance and precise transistor matching are critical. The SSM2212RZ-R7 is suitable for designs requiring high current gain and low offset voltage without the need for external trimming. Consider the 8-lead SOIC package for standard surface-mount assembly. Evaluate the thermal resistance characteristics if operating near the upper temperature limits.

Part Context

The SSM2212 series includes variants such as the SSM2212CPZ-R7 in a 16-lead LFCSP package. The R7 suffix indicates reel packaging for automated assembly. The device is part of Analog Devices' portfolio focused on precision analog components. It serves as a specialized alternative to commercially available monolithic amplifiers in high-fidelity audio and precision measurement applications.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material. Verify compatibility with existing circuit designs if considering alternatives. Consult manufacturer documentation for any recommended upgrades or obsolescence notices regarding the SSM2212 series.

FAQ

What is the maximum noise voltage density specified for the SSM2212?

The maximum noise voltage density is 1 nV/√Hz at 100 Hz.

How does the SSM2212 protect against degradation of beta and matching characteristics?

Protection diodes across the base-emitter junction prevent degradation caused by reverse biasing of the junction.

What is the typical current gain match (ΔhFE) guaranteed by the device?

The current gain match is guaranteed to approximately 0.5%.