PDTA123ET, SMD code: W21, p21, t21,  
Nexperia, NXP Semiconductors, PNP resistor-equipped transistor, 
R1=2.2 kΩ, R2=2.2 kΩ, Vceo. −50V, Io. −100mA, 250mW 

APPLICATIONS: 
• General purpose switching and amplification 
• Inverter and interface circuits 
• Circuit driver. 
PDTA123ET series: 1-base, 2-emitter, 3-collector,

Case plastic: SMD, SMT, SOT-23, Marking: W21, p21, t21, 

p =  Made in Hong Kong. 
t =   Made in Malaysia. 
W = Made in China.