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Analog devices SSM2210 pz 8-pin dil dual transistor ic
Analog Devices SSM2210PZ 8-Pin DIL Dual Transistor IC
http://homepage.ntlworld.com/henry01/frequency_shifter/frequency_shifter.htm
These are new, untouched parts. The Analog Devices web page describes it thus:
"The SSM2210 is a dual NPN matched transistor pair specifically designed to meet the requirements of ultra-low noise audio systems. With it's extremely low input base spreading resistance (rbb' is typically 28 ), and high current gain (hFE typically exceeds 600 @ lC = 1 mA), systems inplementing the SSM2210 can achieve outstanding signal-to-noise ratios. This will result in superior performance compared to systems incorporating commercially available monolithic amplifiers"
* Very Low Voltage Noise - @ 100 Hz, 1 nV/ Hz MAX
* Excellent Current Gain Match - 0.5% TYP
* Tight VBE (VOS) - 200 V MAX
* High - Gain Bandwidth Product - 200 MHz TYP
* Outstanding Offset Voltage Drift
* Direct Replacement for LM394BN/CN
You can downlad the data sheet from Analog Devices here:
http:// /en/other-products/matched-transistors/ssm2210/products/product.html