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(Topic ID: 290741)

Tech: MPSA42 Transistor Equivalent (5A-9216?)

By Goonie

3 years ago



Topic Stats

  • 10 posts
  • 6 Pinsiders participating
  • Latest reply 2 years ago by G-P-E
  • No one calls this topic a favorite

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#1 3 years ago
OP
 
ALK

Goonie

Pinside+ Frequent

US Geneva, IL

12y 81,300 1,695 21

Hey all.

I'm working on a Bally 6803 display that has the H & J segments out on all digits. I've re-flowed the solder and confirmed it's not a cable issue, so I'm going to swap out the resistors and transistor. I'm having a bit of trouble finding an MPSA42, but Marco lists a 5A-9216 - I assume as a recommended swap. Before I do this and blow something up, I thought I would verify. I can't find much out of the web that shows these are equivalent. Can anyone confirm I can swap these? Looking at the specs on both, I think I am fine, but I'm far from an expert in this field.

Thanks!

Aaron

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#2 3 years ago
 
CHD

Cheddar

GoldenStatePin

US Lodi, CA

11y 117K 5,180 17 10

Just order MPSA42 from great plains although I am sure the Marco one is fine too.
https://www.greatplainselectronics.com/proddetail.asp?prod=MPSA42

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#3 3 years ago
OP
 
ALK

Goonie

Pinside+ Frequent

US Geneva, IL

12y 81,300 1,695 21

Quoted from Cheddar:

Just order MPSA42 from great plains although I am sure the Marco one is fine too.
https://www.greatplainselectronics.com/proddetail.asp?prod=MPSA42

Oh man, I could have sworn I checked there. Thank you!

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#4 3 years ago
 
???

KenLayton

In Memoriam

US Olympia, WA

12y 83,400 5,965

Yes indeed an MPSA42 does cross to NTE287.

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#5 3 years ago
 
GPE

G-P-E

GPE

US Omaha, NE

13y 76,800 2,778 4

KSP42 is an equivalent that was made by Fairchild Semiconductor.

MPSA42s were originally made by Motorola (ON-Semi) but discontinued them a few years back.
ON-Semi bought Fairchild, discontinued the KSP42, started making MPSA42s again (KSP42 with a different part number) ... and now they have discontinued them again.

Fortunately, there are still a couple other manufacturers of these left.

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#6 3 years ago
 
PIP

Quench

Pinside member

8y 114K 8,020

OP
Quoted from Goonie:

I'm having a bit of trouble finding an MPSA42, but Marco lists a 5A-9216

5A-9216 is a Williams part number for a MPSA42 transistor.

Swap a suspect MPSA42 with a working one to see if the fault follows the transistor or the display segment.

Post last edited 3 years ago.

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#7 3 years ago
OP
 
ALK

Goonie

Pinside+ Frequent

US Geneva, IL

12y 81,300 1,695 21

Thanks all for the information and education. Will place an order and see what happens.

3 weeks later
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#8 3 years ago
OP
 
ALK

Goonie

Pinside+ Frequent

US Geneva, IL

12y 81,300 1,695 21

Hi

Just closing the loop here. So, I replaced all 3 resistors and the transistor controlling H and J, and no luck. However, swapping out the U1 chip did the trick and I am back in business with a fully operational display.

Thanks for the guidance.

Aaron

9 months later
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#9 2 years ago
 
PBB

Pinball_Basement

Blocked

3y 468

Quoted from G-P-E:

KSP42 is an equivalent that was made by Fairchild Semiconductor.
MPSA42s were originally made by Motorola (ON-Semi) but discontinued them a few years back.
ON-Semi bought Fairchild, discontinued the KSP42, started making MPSA42s again (KSP42 with a different part number) ... and now they have discontinued them again.
Fortunately, there are still a couple other manufacturers of these left.

https://www.rocelec.com/part/ONSMPSA42

Back being made

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#10 2 years ago
 
GPE

G-P-E

GPE

US Omaha, NE

13y 76,800 2,778 4

Nah, that's just Rochester selling out old On-Semi parts.

On-Semi discontinued the MPSA42 (selling old inventory through Rochester). In it's place, On-Semi is pushing the Fairchild KSP42 which is the exact same part. On-Semi bought out Fairchild and continues to make many of the old Fairchild parts but under the On-Semi name. If you want the new version of this part number - search for KSP42BU (bulk bag) or KSP42TA (Tape and Reel).

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