Product Overview
16-Pin Surface-Mount Pulse-Width-Modulation Control IC
Condition
Unused new old stock (NOS). Evaluation: Visual inspection only. Clean surface-mount leads with straight gull-wing pins. Markings legible: TL494C. Sold each.
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Product Overview
Texas Instruments TL494CDR is a fixed-frequency pulse-width-modulation (PWM) control circuit designed primarily for power-supply control across multiple switching topologies. Housed in a 16-pin SOIC package, it incorporates an internal 5.0 V reference, dual error amplifiers, an adjustable oscillator, dead-time control comparator, and uncommitted output transistors capable of push-pull or single-ended operation.
Key Features
- Operates from 7 V to 40 V supply voltage
- Dual uncommitted output transistors rated for 200 mA sink or source current
- Internal linear reference generator trimmed to 5.0 V (±5%)
- Oscillator frequency capability up to 300 kHz
- Built-in dead-time control and pulse-steering flip-flop
- Compact 16-pin SOIC surface-mount package (150 mil body width)
Applications
- Bench power supply builds and switch-mode converter prototyping
- Repairing legacy computer power supplies and inverter boards
- Driving push-pull converters, half-bridge stages, and step-down buck regulators
- Makers designing custom variable-voltage DC motor drives and induction heaters
Frequently Asked Questions
How does the TL494CDR package differ from the standard TL494CN?
The TL494CDR is packaged in a 16-pin narrow SOIC surface-mount footprint (3.9 mm / 150 mil body width), whereas the TL494CN is a 16-pin through-hole DIP. Pin assignments and electrical functions are identical between the two package styles.
Can the output transistors be configured for push-pull operation?
Yes. The output-control pin selects either push-pull operation (alternating transistor pulses via an internal flip-flop) or parallel single-ended drive.
What is the difference between the TL494CDR and other TL494 variants?
The TL494CDR shares the exact electrical specifications and 16-pin SOIC footprint with the TL494CD. It operates across the commercial temperature range of 0°C to 70°C, while industrial versions like the TL494ID cover -40°C to 85°C. Each piece costs less as the order grows - see the price-break table on this page.
Few chips have quietly regulated more power supplies over the decades than the classic 494. Solder it down and put those dual outputs to work.
