Audio, Dual-Matched

NPN Transistor

SSM2212

Rev.

B

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FEATURES

Very low voltage noise: 1 nV/√Hz maximum @ 100 Hz

Excellent current gain match: 0.5%

Outstanding offset voltage drift: 0.03 μV/°C

High gain bandwidth product: 200 MHz

PIN CONFIGURATION

NIC

4

8

7

6

NIC

5

SSM2212

NIC = NO INTERNAL CONNECTION

Figure 1. 8-Lead SOIC_N

GENERAL DESCRIPTION

The SSM2212 is a dual, NPN-matched transistor pair that is

specifically designed to meet the requirements of ultralow noise

audio systems.

With its extremely low input base spreading resistance (rbb' is

noise ratios. The high current gain results in superior

performance compared to systems incorporating commercially

available monolithic amplifiers.

symmetrically balanced designs, which reduce high-order

amplifier harmonic distortion.

Stability of the matching parameters is guaranteed by protection

diodes across the base-emitter junction. These diodes prevent

degradation of beta and matching characteristics due to reverse

biasing of the base-emitter junction.

The SSM2212 is also an ideal choice for accurate and reliable

current biasing and mirroring circuits. Furthermore, because a

current mirror’s accuracy degrades exponentially with mismatches

does not need offset trimming in most circuit applications.

The SSM2212 performance and characteristics are guaranteed

over the extended temperature range of −40°C to +85°C.