Mitsubishi 5218A Op-amp

renatofuza

New member
Folks...I have a couple of this chips...any suggestions for what pedal can I use it?
They was used by Boss at some point on japanese SD-1
 
The Mitsubishi M5128A is just another jellybean sort of opamp that can be used in most any pedal circuit that calls for a dual opamp. They are no longer in production and came in two package styles - DIP-8 and SIP-8. And IIRC, Boss used the SIP-8 packaging in several of their pedals in the beginning. The DIP-8 packaging of the M5128A has the same pinout of several other dual opamps like the 4558, TL072, 1458, and so forth. IF you have the SIP-8 packaged M5128A opamps, you will need the datasheet to see the pinout.
 
The Mitsubishi M5128A is just another jellybean sort of opamp that can be used in most any pedal circuit that calls for a dual opamp. They are no longer in production and came in two package styles - DIP-8 and SIP-8. And IIRC, Boss used the SIP-8 packaging in several of their pedals in the beginning. The DIP-8 packaging of the M5128A has the same pinout of several other dual opamps like the 4558, TL072, 1458, and so forth. IF you have the SIP-8 packaged M5128A opamps, you will need the datasheet to see the pinout.

Thanks for the class!!!
So...using the M5128A or a TL072 makes no difference at all?
(mine are DIP-8)
 
Thanks for the class!!!
So...using the M5128A or a TL072 makes no difference at all?
(mine are DIP-8)
Based on the M5128A datasheet, the DIP-8 M5128A and the TL072 are pin-for-pin compatible. The slew rate of the M5128A is ~3V/µs while the TL072 has a slew-rate of ~13V/µs. But you will not hear a difference.

Dual Op Amp, Pin-for-Pin Equivalents:

AD712 - Slew = 16V/µs
CA3240 - Slew = 9V/µs;
LF353 - Slew = 13V/µs
LM358 - Slew = 0.3V/µs (@ unity)
LM1458 - Slew = 0.5V/µs
LM2903 - Diff. Comparator
LM4558 - Slew = 1.7V/µs
LM4559 - Slew = 2V/µs
LT1490 - Slew = 0.06V/µs
uPC4570 - Slew = 7V/µs
LM4560 - Slew = 5.5V/µs
LM4580 - Slew = 5V/µs
LM833 - Slew = 7V/µs
LMV652 - Slew = 3V/µs ~ 0.12 mA;
NE5532 - Slew = 9V/µs
OPA1642 - Slew = 20V/µs
OPA2107 - Slew > 9V/µs
OPA2134 - Slew = 20V/µs
OPA2604 - Slew = 25V/µs
OP275 - Slew = 22V/µs
RC4559 - Slew = 2V/µs
TL022 - Slew = 0.5V/µs ~ 0.13 mA
TL062 - Slew = 13V/µs
TL072 - Slew = 13V/µs
TL082 - Slew = 13V/µs
TLE2072A - Slew = 35V/µs
 
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