Since the TPA3116D2DAD currently has no availability, I need to find to replacement and prefer a drop-in replacement, if at all possible. It appears that the TPA3116D2-Q1 (automotive) part is the most likely candidate, but there are the following concerns when comparing the specifications of these parts.
Thermal Performance. The TPA3116D2-Q1 Junction-to-ambient thermal resistance numbers are much higher than the TPA3116D2DAD part (44.7 °C/W vs 22 °C/W). It looks like this is due to the fact that the numbers on the -Q1 part are specified with a much smaller heatsink; the -Q1 part is specified with a 15-mm × 15-mm × 2-mm copper heat slug heat sink and the TPA3116D2DAD is 14mm wide, 50mm long, & 25mm high. So, this may be fine, however according the mechanical diagram in the spec sheet, the -Q1 thermal pad is smaller --the TPA3116D2-Q1 pad size is 3.04x3.74mm(max) and the TPA3116D2DAD pad size is 4.11x4.36mm (max). Is this a concern for use as a replacement, and why is the thermal pad smaller on a part that is designed to be used over a wider temperature range?
Gain (BTL) and Gain(SLV) specification. On the TPA3116D2-Q1, the Gain(BTL) and Gain(SLV) numbers are specified at different resistor values than the TPA3116D2DAD. In fact, the resistor values in the -Q1 spec are undefined values according to “Table 1. Gain and Master or Slave”. For example, Table 1 shows that for MASTER mode with a Gain of 20dB, R1 should be 5.6k Ohms, and R2 should be OPEN, however in the DC Electrical Characteristics, a Typical Gain of 20dB shows R1 = OPEN and R2 = 20k Ohms. This discrepancy does not appear in the TPA3116D2DAD spec sheet. When using the TPA3116D2-Q1, which values should be used for a gain of 20dB? Is this a concern for replacing the TPA3116D2DAD with the TPA3116D2-Q1?
Any help you can give will be greatly appreciated.
