Hello together I'm new in this forum and i hope you could help me.
I'm in a project to make my own amplifier. My question is: What are the disadvantages for replace a SSM2212 or SSM2210 Transistor with two normal NPN transistors like 2N5401? I can't find a good replacement for the SSM22112/10 and I don't want to buy one for like 50 $.
Sorry for my english I'm from Germany hope you understand 😉
Thank you in advance!
I'm in a project to make my own amplifier. My question is: What are the disadvantages for replace a SSM2212 or SSM2210 Transistor with two normal NPN transistors like 2N5401? I can't find a good replacement for the SSM22112/10 and I don't want to buy one for like 50 $.
Sorry for my english I'm from Germany hope you understand 😉
Thank you in advance!
Think of your question in this way: Why specify the matched monolithic pair in the first place? The next question becomes: How much worse is an unmatched pair of lower grade, discrete transistors without the isothermal properties of being on the same chip?
If you want the best properties of the duals, you can always use standard NXP , Infineon, Toshiba etc. duals in SMD format. The matching will be intrinsically close and you can mount them on miniature adaptor boards to allow you to plug into a DIL socket as these examples or in matrix board for trials.
Here's an example datasheet of inexpensive general purpose duals from On-semi - http://www.onsemi.com/pub_link/Collateral/BC846BDW1T1-D.PDF
If you want the best properties of the duals, you can always use standard NXP , Infineon, Toshiba etc. duals in SMD format. The matching will be intrinsically close and you can mount them on miniature adaptor boards to allow you to plug into a DIL socket as these examples or in matrix board for trials.
Here's an example datasheet of inexpensive general purpose duals from On-semi - http://www.onsemi.com/pub_link/Collateral/BC846BDW1T1-D.PDF
Hi Ole,
Both SSM2212 and SSM2210 contain NPN transistor.
2N5401 is PNP one, but anyway this series (2N5551/5401) is a completely different story (high voltage, moderate beta).
Options I would recommend:
- matched pair of BC550B - easy to get;
- SMD dual pair - BC846S - SOT363 package.
Both SSM2212 and SSM2210 contain NPN transistor.
2N5401 is PNP one, but anyway this series (2N5551/5401) is a completely different story (high voltage, moderate beta).
Options I would recommend:
- matched pair of BC550B - easy to get;
- SMD dual pair - BC846S - SOT363 package.
Tanks for your support! That helped me alot
I will use the SSM2220 an SSM2212 in SMD format
Greetz Ole
I will use the SSM2220 an SSM2212 in SMD format
Greetz Ole
I'm just a few years late...
Hey Ole1892,
Just out of curiosity- did you ever find some of these that came mounted on a DIP Adapter board?
Hey Ole1892,
Just out of curiosity- did you ever find some of these that came mounted on a DIP Adapter board?
Expensive alternative with legs
While searching around I found Analog Devices MAT12AHZ Dual NPN Transistor, 20 mA, 10 V, 6-Pin TO-78, which has the same charcteristics as the old SSM2210, but is a leaded CAN type. A bit pricey at £24, compared to ~£6 for SSM2212 (SMD), but easier to use and would just drop straight into an older design.
While searching around I found Analog Devices MAT12AHZ Dual NPN Transistor, 20 mA, 10 V, 6-Pin TO-78, which has the same charcteristics as the old SSM2210, but is a leaded CAN type. A bit pricey at £24, compared to ~£6 for SSM2212 (SMD), but easier to use and would just drop straight into an older design.
Aren't SSM2210 and 2212 not only well matched duals, but also low noise parts? In this case this needs also be respected when chosing substitutes.
Best regards!
Best regards!
The specifications for the MAT12 and the SSM2210/12 are exactly the same
The specifications for the MAT12 and the SSM2210/12 are exactly the same:
Very low voltage noise: 1 nV/√Hz maximum at 100 Hz
Excellent current gain match: 0.5% typical
Low offset voltage (VOS): 200 μV maximum
Outstanding offset voltage drift: 0.03 μV/°C typical
High gain bandwidth product: 200 MHz
So, other than price (about four times the cost) the MAT12 would just drop straight in where a SSM2210 was fitted, without any change in characteristics.
Shame I'd not found this before I ordered the PCB I just finished designing. I built the original in 1993 with a SSM2210 PDIP!
The specifications for the MAT12 and the SSM2210/12 are exactly the same:
Very low voltage noise: 1 nV/√Hz maximum at 100 Hz
Excellent current gain match: 0.5% typical
Low offset voltage (VOS): 200 μV maximum
Outstanding offset voltage drift: 0.03 μV/°C typical
High gain bandwidth product: 200 MHz
So, other than price (about four times the cost) the MAT12 would just drop straight in where a SSM2210 was fitted, without any change in characteristics.
Shame I'd not found this before I ordered the PCB I just finished designing. I built the original in 1993 with a SSM2210 PDIP!