Datasheet BT138-800E (NXP) - 6

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NXP Semiconductors BT138-800E 4Q Triac 8. Thermal characteristics Table 5. Thermal characteristics Symbol Parameter Conditions Min Typ Max Unit
Rth(j-mb) thermal resistance full cycle; Fig. 6 - - 1.5 K/W from junction to half cycle; Fig. 6 - - 2 K/W mounting base Rth(j-a) thermal resistance in free air - 60 - K/W from junction to ambient 003aaj343 10 Zth(j-mb) (K/W) 1 (1) 10-1 (2) PD 10-2 tp t 10-310-5 10-1 10-2 10-4 10-3 1 10 tp (s) (1) Unidirectional (half cycle) (2) Bidirectional (full cycle)
Fig. 6. Transient thermal impedance from junction to mounting base as a function of pulse duration
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Product data sheet 30 August 2013 6 / 13
Document Outline 1. General description 2. Features and benefits 3. Applications 4. Quick reference data 5. Pinning information 6. Ordering information 7. Limiting values 8. Thermal characteristics 9. Characteristics 10. Package outline 11. Legal information