SSM2212RZ-RL

Overview

The SSM2212RZ-RL is an 8-lead SOIC dual NPN-matched transistor pair designed for ultralow noise audio systems. It features a maximum voltage noise density of 1 nV/√Hz at 100 Hz and a typical current gain (hFE) exceeding 600 at IC = 1 mA. The device guarantees excellent current gain matching with ΔhFE of 0.5% and low offset voltage (VOS) of 200 μV maximum. Operating over the extended temperature range of −40°C to +85°C, it offers a high gain bandwidth product of 200 MHz and low offset voltage drift of 0.03 μV/°C when trimmed.

Feature Summary

• Dual NPN-matched transistor pair optimized for ultralow noise audio applications
• Excellent current gain matching and low offset voltage for symmetrically balanced designs
• Protection diodes across base-emitter junctions ensure stability of matching parameters
• Suitable for accurate current biasing and mirroring circuits without offset trimming

Applications

• Ultralow noise audio systems
• Symmetrically balanced amplifier designs to reduce harmonic distortion
• Accurate and reliable current biasing and mirroring circuits
• Fast logarithmic amplifiers requiring wide dynamic range and fast response

Procurement Notes

Verify the package type matches the required PCB footprint, specifically the 8-lead Standard Small Outline Package (R-8). Confirm RoHS compliance status indicated by the 'Z' suffix in the part number. Ensure operating conditions remain within the specified absolute maximum ratings, particularly collector current and breakdown voltages, to maintain reliability over the extended temperature range.

Selection Notes

Select this component when system requirements demand minimal input voltage noise and tight current gain matching between paired transistors. The low offset voltage characteristics make it preferable over commercially available monolithic amplifiers for precision analog signal processing. Consider thermal resistance values if multiple units are placed closely on the board to manage junction temperatures effectively.

Part Context

This part belongs to the SSM2212 family of dual matched NPN transistors from Analog Devices Inc. It is specifically engineered to address the stringent noise and matching requirements of high-fidelity audio equipment. The R-8 package variant provides a compact surface-mount solution suitable for dense circuit board layouts while maintaining electrical performance guarantees across the industrial temperature range.

Replacement Considerations

SSM2212RZ-R7 shares identical electrical specifications and package dimensions with the SSM2212RZ-RL, differing only in reel packaging configuration.