This device has been transferred from Ampleon to Rochester Electronics.
VHF push-pull power MOS transistor
Dual push-pull silicon N-channel enhancement mode vertical D-MOS transistor encapsulated in a 4-lead, SOT262A1 balanced flange package with two ceramic caps. The mounting flange provides the common source connection for the transistors.
Features and benefits
- High power gain
- Easy power control
- Good thermal stability
- Gold metallization ensures excellent reliability
Applications
- Broadcast transmitters in the VHF frequency range
Parametrics
| Symbol | Parameter | Conditions | Min | Typ/Nom | Max | Unit |
|---|---|---|---|---|---|---|
| frange | frequency range | 50 | 225 | MHz | ||
| PL(1dB) | nominal output power at 1 dB gain compression | 300 | W | |||
| Test signal: CW | ||||||
| Gp | power gain | PL = 250 W; VDS = 50 V [0] | 14 | 16 | dB | |
| ηD | drain efficiency | PL = 250 W; VDS = 50 V; f = 225 MHz; IDq = 500 mA [0] | 50 | 55 | % | |
| PL | output power | [0] | 250 | W | ||
Package / Packing
| Type number | Package | Outline version | Reflow-/Wave soldering |
Packing | Product status | Marking |
Orderable part number, (Ordering code (12NC)) |
|---|---|---|---|---|---|---|---|
| BLF278 | CDFM4 (SOT262A1) |
sot262a1_po | Bulk Pack | Transferred | Standard Marking |
BLF278,112 (9339 785 20112) |
|
| BLF278/01 | CDFM4 (SOT262A1) |
sot262a1_po | Bulk Pack | Transferred | Standard Marking |
BLF278/01,112 (9340 318 50112) |
Pinning info
| Pin | Symbol | Description | Simplified outline | Graphic symbol |
|---|---|---|---|---|
| 1 | D1 | drain1 |
|
|
| 2 | D2 | drain2 | ||
| 3 | G1 | gate1 | ||
| 4 | G2 | gate2 | ||
| 5 | S | source |
Documentation
| Title | Type | Date | |
|---|---|---|---|
| VHF push-pull power MOS transistor | Data sheet | 2015-11-30 | |
| Mounting and soldering of RF transistors in air cavity packages | Application note | 2024-05-23 | |
| RF power solutions for ISM, broadcast, navigation and safety radio applications | Brochure | 2024-10-25 | |
| RF power application reports for ISM, broadcast, navigation and safety radio applications | Brochure | 2024-10-08 | |
| Packages for RF power transistors | Leaflet | 2024-10-25 |
Design support
| Title | Type | Date | |
|---|---|---|---|
| BLF278 50V 500mA S-parameter Data | S-parameter | 2012-06-08 | |
| BLF278 25V 500mA S-parameter Data | S-parameter | 2012-06-08 |