Product Overview
Motorola JE340 Power Transistor - 5A, 300V NPN Silicon in a Tab-Mount Package
Condition
New. The markings are stamped into the exposed metal tab itself: JE340 across the bottom, the encircled Motorola M and the three-digit code 307 along the top, and a small round factory mark between them. All three leads are straight, full length, and bright with factory tinning: no bends, no trimmed ends, no solder on them. That marked tab face shows its mill finish with light mottling and faint handling marks that only appear under macro magnification, and the mounting hole is clean and unobstructed. The black plastic frame around the tab is unchipped and the stamped lettering is crisp and fully legible.
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Product Overview
The JE340 is a Motorola NPN silicon power transistor rated 5A and 300V, supplied with tinned leads. It comes in a three-lead package with a black plastic body and a large exposed metal tab carrying a single mounting hole, the tab-mount outline used for medium-power switching and driver work, so it bolts or clips to a heatsink rather than relying on the board for heat. The identity is stamped right into that metal tab face: the encircled M, the 307 code, and the JE340 part number, which is exactly what a technician cross-referencing an old bill of materials or a failed device needs to compare against. Electrical parameters beyond the 5A and 300V ratings and the NPN silicon construction are not confirmed here - verify against the JE340 datasheet before designing it in.
Key Features
- Part number: JE340, stamped into the metal tab face
- Manufacturer: Motorola, identified by the encircled M logo on the same tab face
- Type: NPN silicon power transistor
- Collector current: 5A
- Voltage: 300V
- Leads: three straight factory-tinned leads, full length as photographed
- Package: three-lead tab mount - large marked metal tab with one mounting hole on the face, mostly black plastic on the reverse
- Additional marking: three-digit code 307 beside the Motorola logo
- Condition: New
Applications
- Bench technician rebuilding a legacy linear power supply who wants a period-correct Motorola NPN in the pass or driver position
- Industrial electronics tech repairing a control or relay driver board where the original JE340 has gone short
- Restorer working on vintage equipment who would rather fit original Motorola silicon than guess at a modern cross-reference
- Maker building a higher-voltage switching stage that needs a tab-mount device bolted straight to a heatsink
Frequently Asked Questions
What exactly is printed on the part?
Three elements stamped into the metal tab face: the encircled Motorola M with the code 307 beside it, a small round factory mark below the logo, and JE340 across the bottom. The photographs show the markings at full magnification, so you can hold them against the device you are replacing before you order.
Are the leads straight, or have they been formed or trimmed?
Straight, full length, and bright. The tinning is factory finish, and the photos show no bends, no cut ends, and no solder residue on any of the three leads. They go into a through-hole board as-is, or take whatever bend radius your layout calls for.
How does it mount?
The large exposed metal tab with the single mounting hole is the marked face - JE340, the encircled M and the 307 code are stamped into that same metal surface - while the reverse is mostly black plastic with a smaller metal area around the hole. It fastens to a heatsink or chassis the way any tab-mount power device does. The outline is the common three-lead tab style for this class of transistor, but confirm the mechanical drawing, the mounting orientation, and whether the tab is electrically live against the JE340 datasheet before you drill a bracket or order a mounting kit.
Which electrical figures are confirmed and which are not?
Confirmed here: NPN silicon construction, 5A, 300V, and tinned leads. Gain, saturation voltage, switching times, and thermal ratings are not confirmed on our side - pull the JE340 datasheet and check them against your design before use.
Why buy one or two here instead of a bulk lot of fifty?
Because a transistor like this goes in one at a time. One to replace the device that failed, two or three if you want a spare on the shelf next to the board you just fixed, and there is no reason to take home a bag of fifty to get there. Stock here is a handful of pieces, not a pallet, each one the part shown in these photographs, and you pick the count. Shipping is $8 flat rate and free once your order passes $28, and orders leave our Idaho warehouse the same or next business day.
An encircled M, a three-digit code, and JE340 - Motorola said everything it needed to say in three lines on a tab you can cover with a fingertip. The leads are still straight and bright, waiting on the board that finally needs 5A behind it.
