Product Overview
GE D40C1 NPN Darlington Transistor, 30 V 0.5 A, High Gain in a TO-202 Tab Case
Condition
Condition: unused, new old stock (NOS). Markings legible: GE D40C1. Sold each.
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Product Overview
General Electric marked this D40C1, an NPN silicon Darlington power transistor designed for general purpose amplifier work where high gain is required. It sits in the TO-202 case: a plastic body, three in-line leads and a metal tab with a mounting hole. The D40C1 is out of production.
Key Features
- NPN silicon Darlington, two stages of gain in one case
- VCEO 30 V; VEBO 13 V
- Collector current 0.5 A continuous, 1.0 A peak
- DC current gain (hFE) 10,000 minimum at VCE 5.0 V, IC 200 mA
- VCE(sat) 1.5 V and VBE(sat) 2.0 V at IC 500 mA, IB 0.5 mA
- Power dissipation 6.25 W at a 25 °C case; junction and storage -55 °C to +150 °C
Applications
- Driving a relay coil, lamp or small solenoid from a logic or op-amp output that can only supply a small base current
- Putting a D40C1 back into an older amplifier or driver board that was built around one
Frequently Asked Questions
Is TO-202 the same as TO-220?
No. TO-202 is a separate case outline, and a TO-220 footprint or heatsink is not a guaranteed fit. Match the board to the TO-202 body and tab.
How much gain does a Darlington like this give?
The D40C1 is rated for an hFE of 10,000 minimum at 5.0 V and 200 mA. With two transistors stacked inside one case, a base current in the milliamp range can switch a load of a few hundred milliamps.
How much voltage does the D40C1 drop when switched on?
1.5 V collector to emitter at 500 mA with 0.5 mA of base current, so a load switched at that current gets the supply voltage less 1.5 V.
A Darlington does the work of two transistors in one case, and the D40C1 turns that into a 10,000 minimum gain on a small tabbed body. If an old driver board still has a D40C1-shaped gap in it, this is the part that fills it.
