Product Overview
Motorola TIP31B - NPN Silicon Power Transistor, 80V 3A 40W, TO-220
Condition
New. The photo shows a representative unit from our stock.
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Product Overview
The TIP31B is the 80 V grade of the TIP31 NPN power series, B being the third rung of a ladder that runs 40 V unlettered, 60 V for A, 80 V for B and 100 V for C (onsemi's published tip31a-d data, which covers TIP31A/B/C and TIP32A/B/C).
5 are on the shelf, sold each, and 5 is the exact count. The representative unit photographed reads TIP31B on the black face, with the Motorola batwing and 334 on the line beneath and a small circular factory stamp lettered MEXICO around its rim above the part number. 334 stays a marking string on this page, because the published data we work from carries no decode for these codes and we are not going to read a manufacture date out of one. The tab is bare with a clean mounting hole, the back of the tab photographs a dull red-brown, and the three leads are full length, straight and tinned bright.
Key Features
- Polarity: NPN silicon power transistor
- VCEO: 80 V, the B voltage grade (per onsemi's published tip31a-d data)
- IC: 3.0 A continuous (per onsemi)
- PD: 40 W at TC = 25 degC (per onsemi)
- Package: TO-220 plastic, three leads, metal tab with mounting hole
- Mount: through-hole
- Series: TIP31/TIP32 is the published complementary pair, so the grade-matched PNP counterpart to this part by number is a TIP32B (per onsemi)
- Body marking on the unit photographed: MEXICO stamp, TIP31B, Motorola batwing, 334
- No pin assignment or tab connection is quoted here; the data we work from does not publish one for this package, so check onsemi's published TIP31/TIP32 series data against your board before mounting
- Verify against onsemi's published tip31a-d series data before designing in.
Applications
- General purpose amplifier and switching stages
- Driver ahead of a larger output pair
- Relay, lamp and small motor switching
- Repair of legacy boards built around the TIP31 family
Frequently Asked Questions
How many should I order?
Order the count the build needs. 5 is the exact shelf count here, sold one at a time, so the number you see is the number there is; take the spare on the same order rather than counting on a second trip. Shipping is $8 flat rate and free on orders over $28, so small parts like this ship smartest as part of a larger order.
My board calls for a TIP31C. Will the B do?
Check the rail first. Per onsemi's published data the two parts share everything but the breakdown grade: 3.0 A continuous, 40 W at TC = 25 degC, same TO-220 body. The suffix is the whole difference, and B is 80 V VCEO against the C part's 100 V. On a 24 V or 48 V rail with modest inductive kick that gap rarely matters; on a design that was specified at 100 V for a reason, it does, and no amount of heatsink makes it up. The body of the unit photographed is stamped TIP31B, so the grade is on the part and not just in our description. What ships is the transistor alone, with no heatsink, insulator or hardware.
Five of them left, each stamped TIP31B over a batwing, with a 334 underneath that we are not going to pretend to decode.
