START499D STMicroelectronics, START499D Datasheet - Page 14

• Manufacturer Part Number: START499D
• Description: TRANS RF NPN 4.5V 1A SOT-89
• Manufacturer: STMicroelectronics

Specifications of START499D

• Transistor Type: NPN
• Voltage - Collector Emitter Breakdown (max): 4.5V
• Gain: 13dB ~ 14dB
• Power - Max: 1.7W
• Dc Current Gain (hfe) (min) @ Ic, Vce: 150 @ 160mA, 3V
• Current - Collector (ic) (max): 1A
• Mounting Type: Surface Mount
• Package / Case: SOT-89
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Frequency - Transition: -
• Noise Figure (db Typ @ F): -
• Other names: 497-8804-2; START499D

Package mechanical data
6.1
14/18
Thermal pad and via design
Thernal vias are required in the PCB layout to effectively conduct heat away from the
package. The via pattern has been designed to address thermal, power dissipation and
electrical requirements of the device.
The via pattern is based on thru-hole vias with 0.203 mm to 0.330 mm finished hole size on
a 0.5 mm to 1.2 mm grid pattern with 0.025 plating on via walls. If micro vias are used in a
design, it is suggested that the quantity of vias be increased by a 4:1 ratio to achieve similar
results.
Figure 20. Pad layout details
Doc ID 14496 Rev 4
SOT-89
START499D