Can you please provide the following information for the SN65HVD30DG4 Part ?
1. Typical Power, (Pd typ)
2. Maximum Power (Pd max)
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The typical power dissipation of the 'HVD30 depends on the loading and signaling rate. Assuming the driver has a 54 Ohm load, figure 16 in the datasheet shows the supply current for signaling rates up to 25 Mbps. Note that at very low signaling rates (0 Mbps) the supply current is about 38 mA. About 2V of the total available supply (3.3V) is dissipated in the load (see figure 22 in the datasheet). So the remaining 1.3V is dissipated in the driver output (push-pull) stage, giving about 50 mW of power dissipated in the device. At 25 Mbps, this increases to about 52 mA, so the internal dissipation would be about 70 mW.
The 'HVD30 maximum power dissipation depends on the conditions allowed; for example, under fault conditions, the driver output current is current limited to 250 mA. The maximum allowable power is specified in the DISSIPATION RATINGS table on page 3 of the datasheet. Note that the allowable power dissipation is dependent on the temperature and board thermal design.
The weight of the 'HVD30 is listed as 82.8 grams (see http://focus.ti.com/quality/docs/searchbyopn.tsp?templateId=5909&navigationId=11220&orderablePartNo=SN65HVD30DG4&pnType=A )
-- Clark Kinnaird
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