SBOA433 March   2021 TMP451 , TMP461 , TMP461-SP , TMP464 , TMP468 , TMP4718 , TMP9R00-SP

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 Series Resistance
    2. 1.2 Variation of η-Factor
    3. 1.3 Variation of Beta
  3. 2Transistor List
  4. 3BJT Test Board
  5. 4Test Procedure
  6. 5Data and Recommendations
  7. 6Summary

2 Transistor List

Table 2-1 lists the transistors tested and their relevant specifications. In addition, a transistor selected for remote temperature sensing should also satisfy the following criteria.

  1. Base-emitter voltage is greater than 0.25 V when collector current is 6 μA, at the highest-sensed temperature.
  2. Base-emitter voltage is less than 0.95 V when collector current is 120 μA, at the lowest-sensed temperature.
  3. Base resistance is less than 100 Ω.
  4. Variations in hFE are small (50 to 150).
  5. There is small lot to lot variation.
  6. η-factor is consistent across temperatures.
Table 2-1 Transistor List and Specifications
Transistor Part Number Package Size Grade Operating and Storage Temperature Range (°C) Type of BJT
(NPN/PNP)
MMBT3904FZ-7B DFN0606-3 0.36 mm2, 0.6 x 0.6 Industrial -55 to +150

NPN
MMBT3906FZ-7B DFN0606-3 0.36 mm2, 0.6 x 0.6 Industrial -55 to +150

PNP
BC847BFZ-7B DFN0606-3 0.36 mm2, 0.6 x 0.6 Industrial -55 to +150

NPN
MMBT3904FA-7B DFN0806-3 0.48 mm2, 0.8 x 0.6 Industrial -55 to +150

NPN
MMBT3906FA-7B DFN0806-3 0.48 mm2, 0.8 x 0.6 Industrial -55 to +150

PNP
MMBT3906LT1G SOT-23 3.77 mm2, 2.9 x 1.3 Automotive −65 to +150

PNP
MMBT3904LP-7B DFN1006-3 0.6 mm2, 0.6 x 1.0 Industrial -55 to +150

NPN
MMBT3904LT1 SOT-23 3.77 mm2, 2.9 x 1.3 Automotive −65 to +150

NPN
2SCR523MT2L SOT-723 1.44 mm2, 1.2 x 1.2 Industrial -55 to +150

NPN
DP0150BLP4-7 DFN1006-3 0.6 mm2, 0.6 x 1.0 Industrial -55 to +150

NPN
BC847BFA-7B DFN0806-3 0.48 mm2, 0.8 x 0.6 Industrial -55 to +150

NPN
BC857BFA-7B DFN0806-3 0.48 mm2, 0.8 x 0.6 Industrial -55 to +150

PNP
PMBT3904MB,315 DFN1006B-3 0.6 mm2, 0.6 x 1.0 Industrial −65 to +150

NPN
PMST3904,115 SOT-323 2.5 mm2, 2.0 x 1.25 Industrial −65 to +150

NPN
MMBT2907 SOT-23 3.77 mm2, 2.9 x 1.3 Industrial -55 to +150

PNP
JANTX2N2907A TO-18 5.6 mm base diameter Space -65 to +200

PNP
JANTXV2N2946A TO-46 5.6 mm base diameter Space -65 to +200

PNP
JANTXV2N2222AUB

3-SMD, no lead

 7.6 mm2, 3.1 x 2.5 Space -65 to +200

NPN
JANTX2N930 TO-18 5.6 mm base diameter Space -55 to +200

NPN
JANTX2N350 TO-39 9 mm base diameter Space -65 to +200

NPN