Audio, Dual-Matched

NPN Transistor

MAT12

Rev. 0

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FEATURES

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

Excellent current gain match: 0.5% typical

Outstanding offset voltage drift: 0.03 μV/°C typical

High gain bandwidth product: 200 MHz

PIN CONFIGURATION

NOTE

1. SUBSTRATE IS CONNECTED

TO CASE ON TO-78 PACKAGE.

2. SUBSTRATE IS NORMALLY

CONNECTED TO THE MOST

NEGATIVE CIRCUIT POTENTIAL,

BUT CAN BE FLOATED.

1

6

2

5

3

4

Figure 1. 6-Lead TO-78

GENERAL DESCRIPTION

The MAT12 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'

to-noise ratios. The high current gain results in superior

performance compared to systems incorporating commercially

available monolithic amplifiers.

for 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 MAT12 is also an ideal choice for accurate and reliable

current biasing and mirroring circuits. Furthermore, because

the accuracy of a current mirror degrades exponentially with

the MAT12 does not need offset trimming in most circuit

applications.

The MAT12 is a good replacement for the MAT02, and its

performance and characteristics are guaranteed over the

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