SSM2212 Audio Dual Matched NPN Transistor

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 typically 28 Ω) and high current gain (hFE typically exceeds 600 at IC = 1 mA), the SSM2212 can achieve outstanding signal-to-noise ratios. The high current gain results in superior performance compared to systems incorporating commercially available monolithic amplifiers.

Excellent matching of the current gain (ΔhFE) to approximately 0.5% and low VOS of less than 10 μV typical make the SSM2212  ideal 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 SSM2212 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 mismatches of VBE between transistor pairs, the low VOS of the SSM2212 does not need offset trimming in most circuit applications.

The SSM2212 SOIC performance and characteristics are guaranteed over the extended temperature range of −40°C to +85°C.

The SSM2212 is available in 8-lead SOIC and 16-lead LFCSP packages.

Features and Benefits
  • Very low voltage noise: 1nV/√Hz max @ 100Hz
  • Excellent current gain match: 0.5%
  • Low offset voltage (VOS):
    200 μV maximum (SOIC)
  • Outstanding offset voltage drift: 0.03 μV/°
  • High gain bandwidth product: 200 MHz
Linear Products
SPICE Models
Data Sheets
Documentnote
SSM2212: Audio Dual Matched NPN Transistor Preliminary Data Sheet (Rev. C)PDF 111 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
SSM2212CPZ-R7 Production16 ld LFCSP (3x3mm, 1.6mm exposed pad) REEL 1500-40 to 85C02.99Y
SSM2212CPZ-RL Production16 ld LFCSP (3x3mm, 1.6mm exposed pad) REEL 5000-40 to 85C02.99Y
SSM2212RZ Production8 ld SOICOTH 98-40 to 85C3.312.99Y
SSM2212RZ-R7 Production8 ld SOICREEL 1000-40 to 85C02.99Y
SSM2212RZ-RL Production8 ld SOICREEL 2500-40 to 85C02.99Y
SSM2212: Audio Dual Matched NPN Transistor Preliminary Data Sheet (Rev. C) ssm2212
SSM2212 SPICE Macro Model ssm2212