Product Overview
RCA T2850D NPN Silicon Power Transistor - 400V 5A 50W TO-220 for Switching and Deflection Circuits
Condition
Unused NOS - New Old Stock. Sourced from legacy electronics supply chains. Leads appear clean and unclipped. Evaluation: Visual inspection only. Function testing not performed. Backed by our satisfaction guarantee.
Ships same business day from Idaho. Packed carefully.
Product Overview
NPN silicon power transistor manufactured by RCA. Part number T2850D. TO-220 plastic package. Rated for high-voltage switching applications including horizontal deflection circuits, switch-mode power supplies, and DC-to-DC converters. The "D" suffix denotes the 400V collector-emitter voltage bin within the T2850 family. Part of the legacy RCA - later Harris/Intersil - power semiconductor line.
Key Features
- Transistor type: NPN Bipolar Junction Transistor (BJT)
- Max collector-emitter voltage (V CEO): 400V
- Max continuous collector current (I C): 5A
- Max power dissipation (P D): 50W
- Package: TO-220 plastic, leaded through-hole
- Current gain (h FE): Not confirmed - verify against datasheet before use
Applications
- Horizontal deflection circuits in CRT televisions and monitors (1970s-80s chassis)
- Switch-mode power supply (SMPS) repair and replacement
- High-voltage DC-to-DC converters
- Legacy industrial motor control boards
- Vintage electronics restoration
Frequently Asked Questions
Does this fit a TO-220 footprint?
Yes. The T2850D is a TO-220 package with standard leaded through-hole pins.
Is this a direct drop-in replacement for a MOSFET?
No. This is a BJT. Substituting it for a MOSFET requires circuit modification. It cannot be driven directly from low-power microcontrollers without an intermediate driver stage.
Does it need a heat sink?
Yes. At rated power dissipation (50W), a heat sink with thermal compound or an insulating pad is required to prevent thermal damage.
What inclusions are provided?
Transistor only. No datasheet, hardware, or heat sink included. Verify application requirements against the original RCA or Harris datasheet before installation.
The T2850D has been out of production for decades. Authentic NOS stock is increasingly difficult to source. Inspect markings upon receipt - genuine units carry RCA or Harris branding.
