What does the "H" mean in Part Number UPC78M15H?

[Michael A. Terrell]

Their X ref specs the NTE 968 for the entire *78*15* lineup. Although it
does say the output is in excess of 1 amp when heat sinked properly.

I did see someone selling the actual UPC78M15H on the net at about $12
US. A bit steep for a 2 dollar part.

- Tim -

The old paper cross reference had a lot better data in it.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Franc Zabkar]

The old paper cross reference had a lot better data in it.

Why didn't you say that before?

My paper NTE catalogue lists the following:

uPC78M05 -> NTE960
uPC78M08H -> NTE964
uPC78M12 -> NTE966
uPC78M18H -> NTE958

The package style for all the NTE parts is "11f" which is TO220.

- Franc Zabkar

 

[Franc Zabkar]

I remeber a lot of surplus TO-3 parts hit the surplus market about 6
months to a year after the T)-220 parts hit the streets. They were
finally cheap enough for hobby work. You didn't mind buying them by the
dozen, instead of asking, DO I REALLY need a regulator for this?


The Online NTE cross reference should list some of the early
variations, if they can still supply replacement parts.

FWIW, the 1990-91 NTE catalogue lists the NTE1916 (1.5A, 15V, TO-3)
and the NTE1918 (3A, 15V, TO-3) devices. Both are still available at
....

http://nte01.nteinc.com/nte/ntemasterxref.nsf/$$Search?OpenForm

Datasheets:
http://www.nteinc.com/specs/1900to1999/pdf/nte1918.pdf
http://www.nteinc.com/specs/1900to1999/pdf/nte1916.pdf

- Franc Zabkar

 

[Jeff Volp]

Well now I'm getting more confused. The part number listed in the
service manual, that is on it's way to me, is UPC78M15H. I had the guy
that is sending it check for that info. The part was made by NEC, the
same manufacturer that makes the 78M15 that is in there now. The PC
board is made for a TO-220 style pinout and heat sink, complete with
mounting holes.

Am I correct in remembering that a T039 id a round metal can about 1/4
inch across or so, and would have the 3 pads at 120 degree intervals?

Yes, that is correct.

National Semiconductor did use the H suffix to denote the metal can. As you
know, prefixes and suffixes are not standardized throughout the industry.

Here is what a Google search turned up:

UPC78M15H
NEC, VoltageRegulator,
15.0 V,0.5 A,TO-220

Jeff

 

[Tim]

Yes, that is correct.

National Semiconductor did use the H suffix to denote the metal can. As you
know, prefixes and suffixes are not standardized throughout the industry.

Here is what a Google search turned up:

UPC78M15H
NEC, VoltageRegulator,
15.0 V,0.5 A,TO-220

Jeff

I guess everyone posting kinda missed the original question.

To sum up;

I know what the part is.
I know who makes it.
I know what the subs are for it.
I know what is available for info on the net.

I need to know why NEC put the H at the end for this part to denote it
was different than a UPC78M15.

Someone who has NEC reference info from the 90's would probably have
this info.

Thanks for everyones input, but I still do not have an answer to the
original question.

- Tim -

 

[Michael A. Terrell]

I guess everyone posting kinda missed the original question.

To sum up;

I know what the part is.
I know who makes it.
I know what the subs are for it.
I know what is available for info on the net.

I need to know why NEC put the H at the end for this part to denote it
was different than a UPC78M15.

The simple fact is, they did it because it suited THEIR needs at the
time. Different OEMs use different conventions to identify their
parts. Generic numbers get crap added on to mold it to fit their normal
scheme. You can dig, beg and conjure all you like, but that is what it
all boils down to. They need a number that fits their system, that can
still be identified as a generic part.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Ross Herbert]

[email protected] says...
I guess everyone posting kinda missed the original question.

To sum up;

I know what the part is.
I know who makes it.
I know what the subs are for it.
I know what is available for info on the net.

I need to know why NEC put the H at the end for this part to denote it
was different than a UPC78M15.

Someone who has NEC reference info from the 90's would probably have
this info.

Thanks for everyones input, but I still do not have an answer to the
original question.

- Tim -

Here is the listing of NEC linear reg device types.
http://www.necel.com/linear/english/pro/pro_list_series.html

Generally, for single output NEC 3 terminal thru-hole fixed
regulators;
character A following type number = output max current up to 2A.
eg uPC24Axx
character L following type number = output max current up 100mA
eg uPC78Lxx
character N following type number = output max current up to 300mA
eg uPC78Nxx
character M following type number = output max current up to 500mA
eg uPC78Mxx
no intermediate character means output max current of 1A
eg uPC78xxA

The characters following the xx part are not explained anywhere but it
can be deduced from the datasheet that the 'A' (as in uPC78MxxA)
refers to a better line/load regulation than a standard reg. (as in
uPC78Mxx which are no longer manufactured I think).

The appended 'H' (when following the 'A') does not appear to mean very
much other than a package type either TO126 or MP-45G. There is
sometimes an 'F' after the 'H' but there does not seem to be any real
significance for the end user in this character.

All in all, the appended characters don't mean anything you should
concern yourself with. The real characters which mean something to the
user are the intermediate ones.

Hope this explains everything. If not, then you should get further
explanation from NEC.

 

[Ross Herbert]

That's the way I remember it, that there was the 309 and the 340 series
and then sometime later the 78XX numbering arrived. I'm not even sure
I remember TO-220 cases in the beginning.

Michael

According to the June 1972 Natsemi data catalog (their very first I
think) the LM309 was released in a solid kovar TO5 header and a TO3
package. The LM340 data shows a TO220 and a TO3 package. The LM320 is
only mentioned briefly in the New Products section at the end and
shows only a TO5 and TO3 package.

 

[Mark Zenier]

I guess everyone posting kinda missed the original question.

To sum up;

I know what the part is.
I know who makes it.
I know what the subs are for it.
I know what is available for info on the net.

I need to know why NEC put the H at the end for this part to denote it
was different than a UPC78M15.

Looking at the Logo/part number section of a 1990 IC Master for NEC,
it says that H is the Package code for TO-220.

But that book does not have any NEC voltage regulators. Neither does
a 1991 NEC product selector guide. Looks like they got out of that
line, or (perhaps) quit marketing them through distribution.

Mark Zenier [email protected]
Googleproofaddress(account:mzenier provider:eskimo domain:com)

 

[Tim]

Here is the listing of NEC linear reg device types.
http://www.necel.com/linear/english/pro/pro_list_series.html

Generally, for single output NEC 3 terminal thru-hole fixed
regulators;
character A following type number = output max current up to 2A.
eg uPC24Axx
character L following type number = output max current up 100mA
eg uPC78Lxx
character N following type number = output max current up to 300mA
eg uPC78Nxx
character M following type number = output max current up to 500mA
eg uPC78Mxx
no intermediate character means output max current of 1A
eg uPC78xxA

The characters following the xx part are not explained anywhere but it
can be deduced from the datasheet that the 'A' (as in uPC78MxxA)
refers to a better line/load regulation than a standard reg. (as in
uPC78Mxx which are no longer manufactured I think).

The appended 'H' (when following the 'A') does not appear to mean very
much other than a package type either TO126 or MP-45G. There is
sometimes an 'F' after the 'H' but there does not seem to be any real
significance for the end user in this character.

All in all, the appended characters don't mean anything you should
concern yourself with. The real characters which mean something to the
user are the intermediate ones.

Hope this explains everything. If not, then you should get further
explanation from NEC.

OK, that really does help me a lot. I suspect the replaced part is not
performing it's job properly. It supplies the front panel control
electronics power in this receiver. If the "H" does have to do with load
regulation, it may be giving unstable power to the panel.

I think I should try to find a proper part and sub it in.

Thanks for your post.

- Tim -