Part Number: AM3354
Hi TI Team,
We have a customer who is evaluating the thermal performance of the AM3354BZCZ100 and would like to verify their Junction Temperature ($T_j$) calculation.
Below are the measurement data and the calculation formula they used based on the AM335x datasheet (Table 7-1. Thermal Resistance Characteristics):
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Measured Power Dissipation ($P$): 1.07 W
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Measured Case Top Temperature ($T_c$ / $T_t$): 89°C (measured using a Type J thermocouple attached to the center top of the package)
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Customer's Calculation Formula:
$$T_j = 89 + (1.07 \times 0.3) = 89.321^\circ\text{C}$$(Note: It appears they are using a junction-to-top characterization parameter, $\Psi_{JT}$, of 0.3°C/W from Table 7-1).
The calculated $T_j$ is 89.321°C, which they believe falls within the operating specification of the AM3354BZCZ100.
Could you please help us confirm the following?
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Is this calculation methodology and the resulting $T_j$ of 89.321°C correct?
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Is the parameter used (0.3°C/W) indeed the correct $\Psi_{JT}$ (Junction-to-Top Characterization Parameter) for the ZCZ package of the AM3354?
Thank you for your support.
Best regards,
Daniel
