Product Overview
QTC MCT274 6-Pin DIP Single-Channel Optocoupler IC
Condition
Used equipment pull. Evaluation: Visual inspection only. Function testing not performed. Markings legible on package face: QTC, MCT274, 9350G. Solder remnants present on through-hole leads.
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Product Overview
The Quality Technologies Corporation (QTC) MCT274 is a single-channel phototransistor optocoupler housed in a standard 6-pin dual in-line package (DIP-6). It pairs a gallium arsenide (GaAs) infrared emitting diode with a silicon NPN phototransistor, providing electrical isolation between input logic and output load circuits with a base terminal available for external biasing or control.
Key Features
- 6-pin through-hole DIP package configuration
- Single-channel optical isolation
- Gallium arsenide (GaAs) infrared LED emitter
- Silicon NPN phototransistor detector with base pin connection
- 5,300 Vrms input-to-output isolation rating
- Current transfer ratio (CTR) range of 225% to 400%
Applications
- Replacing degraded optical isolators during power supply and industrial board bench repairs
- Isolating microcontroller GPIO lines from noisy relay coils and switching transients in custom maker projects
- Restoring legacy control systems and vintage automation modules requiring original-spec DIP-6 isolators
Frequently Asked Questions
What is the pin count and form factor for this part?
The MCT274 is a through-hole 6-pin DIP package with standard 0.1-inch lead pitch spacing.
Does the phototransistor output include a base lead connection?
Yes. The standard DIP-6 pinout provides pin 6 as the phototransistor base connection, allowing optional feedback or biasing circuits.
Why buy an individually pictured unit over an unknown bulk lot?
When repairing legacy hardware or breadboarding a prototype, buying an individually identified, clearly photographed component avoids the cost and clutter of buying bulk surplus reels just to obtain a single DIP-6 part. Flat rate shipping is $8, orders over $28 ship free, and everything ships from our Idaho warehouse the same or next business day.
Clean optical isolation in a classic DIP-6 layout - ready to slot straight into your board and keep your signal lines separated.
Shipping? $8 flat rate, free once your order passes $28 - and it leaves the Idaho warehouse the same or next business day.
