BDX65A Vintage TO-3 NPN Darlington Power Transistor
$14.99
Original BDX65A NPN Darlington power transistor housed in the rugged TO-3 metal can package. This device incorporates an internal shunt resistor and exhibits the higher base-emitter voltage characteristics expected of a Darlington transistor configuration. Suitable for industrial controls, relay drivers, motor control circuits, power switching applications, power supplies, automation equipment, and electronics repair projects. Professionally tested and verified functional with no measurable collector leakage.
Historical Note:
The BDX-series Darlington transistors became popular during the 1970s and 1980s for industrial, commercial, and power control applications. Darlington devices provided very high current gain and simplified driver circuit design, making them common in motor controllers, relay drivers, power supplies, and automation equipment.
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, Relay Drivers, Motor Controllers, Power Switching Circuits, Automation Equipment, Power Supplies, Commercial Electronics, Test Equipment Repair, Semiconductor Substitution Research, Electronics Experimentation
RF Boneyard Bench Notes
Tester Lead Mapping:
Red-C Green-B Blue-E
Bench Measurements:
NPN Darlington BJT
hFE=24 at Ic=5.00mA
Vbe=0.700V at Ib=1.00mA
Vbe=1.077V at Ib=5.00mA
VceSat=0.465V at Ic=5.0mA and Ib=1.00mA
IcLeak=0.000mA
Rshunt=4500R
Bench Evaluation:
PASS - Semiconductor analyzer testing completed successfully.
PASS - Device identified as NPN Darlington transistor.
PASS - No measurable collector leakage detected.
PASS - Internal shunt resistance measured at approximately 4500 ohms.
PASS - Junction voltages consistent with Darlington transistor construction.
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