Product Overview
Motorola MPSA42 - High Voltage NPN Silicon Transistor, 300V 500mA, TO-92
Condition
New. The photo shows a representative unit from our stock.
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Product Overview
The MPSA42 is a high voltage NPN silicon transistor that puts 300 V VCEO and 300 V VCBO into an ordinary TO-92 plastic body (onsemi's published MPSA42 data).
61 are on the shelf, sold each. The representative unit photographed reads MPS on the top line, A42 on the second and the Motorola batwing followed by 443 on the third, all of it on the flat face; the rounded back of the same body carries nothing but a small circular mould mark with a cross through it. 443 is the code string as it comes off the body and it stays a string here, because the published data behind this page decodes nothing about these Motorola-era markings and a date read out of them would be invention. The three leads are long, straight and untrimmed, photographing dark grey in the wide shot and grey with a duller cast in hand.
Key Features
- Polarity: high voltage NPN silicon transistor
- VCEO: 300 V; VCBO 300 V; VEBO 6 V (per onsemi's published MPSA42 data)
- IC: 500 mA continuous (per onsemi)
- PD: 625 mW at TA = 25 degC (per onsemi)
- Package: TO-92 plastic, three through-hole leads
- Complement: MPSA92, the 300 V PNP of the pair (per onsemi)
- Body marking on the unit photographed: MPS, A42, Motorola batwing, 443, with a small crossed circular mould mark on the rounded rear face
- No lead assignment is quoted here; the data we work from does not publish one for this package, so confirm the pinout against onsemi's published MPSA42 data before you solder
- Verify against onsemi's published MPSA42 data before designing in.
Applications
- High voltage small signal switching and level shifting
- CRT, nixie and vacuum fluorescent display drive
- Off-line startup and bleeder circuits inside the 300 V rating
- Repair of legacy boards built around MPSA42 and MPSA92
Frequently Asked Questions
How many should I order?
Order the count the build needs. 61 are here, sold one at a time, so a multi-digit display driver that wants one transistor per cathode can be filled from this single listing along with the spares. Shipping is $8 flat rate and free on orders over $28, so small parts like this ship smartest as part of a larger order.
Does a 300 volt rating in a TO-92 change how I have to lay the board out?
The die will hold it. Your board still has to. onsemi's published MPSA42 data gives 300 V for both VCEO and VCBO and 6 V for VEBO, all in the same plastic body a 40 V small signal part comes in, and nothing about the package grows to match the voltage - lead spacing, creepage and clearance to the neighbouring track are yours to get right. The base-emitter rating deserves a second look too: 6 V is not much reverse drive. We are not quoting a lead order for this package because the data we work from does not publish one, so check onsemi's published MPSA42 data before you solder. The leads on the unit photographed are full length and untrimmed, so there is room to form them to a wider footprint if you want the extra spacing.
Three hundred volts in a body the size of a lentil, and nothing on it says so.
