NJM14558L availability?

[oc disorder]

Hi
Have a Boss Metal Zone with need for a replacement sil IC.
The ones in this one are NJM14558L .
From the data sheet
" The NJM14558 is dual operational amplifier, which can
operate from ±2V supply. The features are low offset voltage,
low bias current and low current consumption.
The package lineup is DIP, DMP and others, so that the
NJM14558 is suitable for portable audio and any kind of signal
amplifier.

■ FEATURES
● Operating Voltage ( ±2.0V~±7.0V )
● Input Offset Voltage ( 3mV max. )
● Slew Rate ( 2.5V/µs typ. ) "

The earlier ones used a M5218AL I gather.

I have checked it with a NJM 4558L which I had which brings it back to life
but am concerned about battery life and other parameters peculiar to this
low voltage version.

Mouser show it as obsolete...
Roland havn't replied.
Profusion plc don't seem to stock it either.
Thanks for looking

[Wakculloch]

Cricklewood electronics in London have them. If the exchange rate or postage is excessive get in touch cos i have some s/h ones.

[Mark Hammer]

Rohm makes a BA-prefix replacement for the 5218. I think the number is 15128.

[oc disorder]

Thanks for the replies.

Seems like the original chip the M5218AL is the best equivalent as can run off ± 2v whats more its eaiser to get hold of which is the most important technicial spec !

Wonder why they went to NJM14558L .... sorta Tube screamer mysterious chip status?
Maybe a cheaper quote !

some info from the data sheets

RHOM
The BA15218, BA15218F, and BA15218N are monolithic ICs with two built-in low-noise, low-distortion operational amplifiers featuring internal phase compensation.
Either a dual or single power supply can be driven, and these products can be driven by a digital system 5V single power supply.
The following packages are available: 8-pin DIP (BA15218), 8-pin SOP (BA15218F), and 8-pin SIP (BA15218N).
•Features
1)Low-voltage operation and single power supply drive enabled.
(Single power supply: 4 to 32V, dual power supply:±3 to ±16V)
2)Low noise level. (Vn = 1.0µVrms typ. : RIAA)
3)High slew rate. (SR = 3V / µs, GBW = 10MHz typ.)
4)Low offset voltage. (VIO = 0.5mV typ.)
5)High gain and low distortion. (GVO = 110dB, THD =0.0015%)
6)Pin connections are the same as with standard dual operational amplifiers,
and outstanding characteristics make these products compatible with
the 4558 and 4560 models.

Mitsubishi M5218AL
Two low noise operational amplifier circuits displaying internal phase compensated high gain and low distortion.
The devices have virtually the same chacteristics as the 4557,4558,4559 and 741 operational amplifiers
Supply voltage range :±2v ~ :±16v
The units can also be used as a single supply type.

[doctor]

Thanks for the replies.

Seems like the original chip the M5218AL is the best equivalent as can run off ± 2v whats more its eaiser to get hold of which is the most important technicial spec !

Wonder why they went to NJM14558L .... sorta Tube screamer mysterious chip status?
Maybe a cheaper quote !

some info from the data sheets

RHOM
The BA15218, BA15218F, and BA15218N are monolithic ICs with two built-in low-noise, low-distortion operational amplifiers featuring internal phase compensation.
Either a dual or single power supply can be driven, and these products can be driven by a digital system 5V single power supply.
The following packages are available: 8-pin DIP (BA15218), 8-pin SOP (BA15218F), and 8-pin SIP (BA15218N).
•Features
1)Low-voltage operation and single power supply drive enabled.
(Single power supply: 4 to 32V, dual power supply:±3 to ±16V)
2)Low noise level. (Vn = 1.0µVrms typ. : RIAA)
3)High slew rate. (SR = 3V / µs, GBW = 10MHz typ.)
4)Low offset voltage. (VIO = 0.5mV typ.)
5)High gain and low distortion. (GVO = 110dB, THD =0.0015%)
6)Pin connections are the same as with standard dual operational amplifiers,
and outstanding characteristics make these products compatible with
the 4558 and 4560 models.

Mitsubishi M5218AL
Two low noise operational amplifier circuits displaying internal phase compensated high gain and low distortion.
The devices have virtually the same chacteristics as the 4557,4558,4559 and 741 operational amplifiers
Supply voltage range :±2v ~ :±16v
The units can also be used as a single supply type.

In MT-2 M5218AL are original opamps and all chips work
at 9V single supply voltage.

For this reason it is possible to use any standard dual opamp
having SIP package (only so called "low voltage" opamps having
maximum supply voltage less than ±4.5V are unsuitable here).

It's possible to use dual opamps having 9-pin SIP package:
only pin #1 should be removed.

Opamps used for replacement may be not low noise type,
because MT-2 has FET as an input stage, and subsequent
opamps noise is not important.

Roland itself replaces sometimes obsolete or shortage parts.

Just in case 4558 and 5218 datasheets are attached.

[jrfrond]

I'd say, if it works, keep it in there and see if anything is different in terms of sound, battery life, etc. Why beat your head against the wall chasing an NLA part if what you have might just be the right thing?