STC 11448425 Vintage TO-3 NPN Darlington Power Transistor With Protection Diode
$19.99
Original STC 11448425 NPN Darlington power transistor housed in the rugged TO-3 metal can package. This specialized power device incorporates an internal protection diode and internal shunt resistor, making it suitable for industrial controls, relay drivers, solenoid drivers, motor control systems, telecommunications equipment, power switching circuits, and OEM electronic equipment repair. Professionally tested and verified functional with no measurable collector leakage. A desirable vintage STC semiconductor for restoration, repair, and collector inventory.
HISTORICAL NOTE:
STC (Standard Telephones and Cables) was a major British telecommunications and electronics manufacturer known for supplying components and equipment to commercial, industrial, communications, and government sectors. Specialized power semiconductors such as this Darlington device were commonly used in control systems, telecommunications infrastructure, and industrial electronics where reliability was critical.
Origin Tracker
Obsolete Stock
Legacy or discontinued stock no longer in normal production flow. Future supply may be limited.
Pipeline quantities are informational and may change after arrival, inspection, sorting, testing, or donor teardown.
Compatible Radios / Boards
Industrial Controls, Telecommunications Equipment, Relay Driver Circuits, Solenoid Drivers, Motor Control Systems, OEM Equipment Repair, Power Switching Circuits, Commercial Electronics, Test Equipment Repair, Semiconductor Substitution Research
RF Boneyard Bench Notes
Tester Lead Mapping:
Red-C Green-E Blue-B
Bench Measurements:
NPN Darlington BJT
hFE=20 at Ic=5.01mA
Vbe=0.755V at Ib=1.00mA
Vbe=1.139V at Ib=5.00mA
VceSat=0.531V at Ic=5.0mA and Ib=1.00mA
IcLeak=0.000mA
Rshunt=6900R
Protection Diode Present: Yes
PASS - Semiconductor analyzer testing completed successfully.
PASS - Device identified as NPN Darlington BJT.
PASS - No measurable collector leakage detected.
PASS - Internal protection diode detected and verified.
PASS - Internal shunt resistor measured at approximately 6900 ohms.
Specialized STC TO-3 Darlington power transistor exhibiting characteristics consistent with industrial and telecommunications control applications. Suitable for restoration, repair, substitution research, and collector inventory.
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