TL494CDRG4 Equivalent & Substitute Parts

Part Overview

The TL494CDRG4 is a PWM controller IC from Texas Instruments designed for multiple DC-DC converter topologies including buck, boost, flyback, forward converter, full-bridge, half-bridge, and push-pull configurations. This device provides transistor driver outputs with integrated dead time control and frequency control features, operating across a 7V to 40V supply voltage range with switching frequencies from 1kHz to 300kHz.

The TL494CDRG4 is discontinued at DiGi Electronics. Equivalent and substitute parts are available from both Texas Instruments and onsemi that maintain core functional compatibility while offering different packaging options, temperature ratings, and availability levels.

Substiute Parts

TL494CDRG4

Texas InstrumentsIn Stock: 35255TL494CDRG4 Datasheet

Current PartRFQ

TL494CDR

Texas InstrumentsIn Stock: 496691TL494CDR Datasheet

Parametric EquivalentRFQ

NCV494BDR2G

onsemiIn Stock: 1516NCV494BDR2G Datasheet

MFR RecommendedRFQ

TL494BDR2G

onsemiIn Stock: 6554TL494BDR2G Datasheet

MFR RecommendedRFQ

TL494CDR2G

onsemiIn Stock: 17458TL494CDR2G Datasheet

MFR RecommendedRFQ

TL594CDR2G

onsemiIn Stock: 17615TL594CDR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the TL494CDRG4 is determined by the following critical parameters:

• Package / Case: All substitutes must use 16-SOIC (0.154", 3.90mm Width) surface mount packaging
• Output Type: Transistor driver configuration
• Voltage Supply Range: 7V ~ 40V compatibility
• Control Features: Dead time control and frequency control capability
• Output Configuration: Positive output configuration
• RoHS Compliance: ROHS3 Compliant status

Substitutes are grouped into two categories:

1. Parametric Equivalent (TL494CDR): Identical base product number with matching electrical specifications and operating temperature range
2. Manufacturer Recommended Alternatives (NCV494BDR2G, TL494BDR2G, TL494CDR2G, TL594CDR2G): Parts with compatible core functionality but variations in topology support, duty cycle ratings, switching frequency capabilities, and temperature operating ranges

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: TL494CDR

The TL494CDR is the direct parametric equivalent to the TL494CDRG4. It maintains identical electrical specifications, operating temperature range (0°C ~ 70°C), and switching frequency capability (1kHz ~ 300kHz). This part is currently active with significantly higher inventory availability (496,630 units). The TL494CDR is available in both Cut Tape and Digi-Reel packaging formats, providing flexibility for different procurement requirements.

Alternative Substitutes from onsemi:

The onsemi alternatives (NCV494BDR2G, TL494BDR2G, TL494CDR2G, TL594CDR2G) are active products with extended temperature operating ranges and integrated synchronous rectifier functionality. These parts are suitable for applications requiring wider temperature performance or enhanced efficiency through synchronous rectification. Selection among these alternatives depends on specific application requirements:

• TL494CDR2G: Maintains the 0°C ~ 70°C operating temperature range matching the original part, with 200kHz switching frequency capability and 48% maximum duty cycle
• TL494BDR2G: Extends operating temperature to -40°C ~ 125°C with 200kHz switching frequency
• NCV494BDR2G: Extends operating temperature to -40°C ~ 125°C with fixed 40kHz switching frequency and single output configuration
• TL594CDR2G: Extends operating temperature to -40°C ~ 85°C with 300kHz switching frequency and 96% maximum duty cycle capability

All substitutes maintain ROHS3 compliance and 16-SOIC surface mount packaging compatibility.

Frequently Asked Questions (FAQ)

Q: Can TL494CDR directly replace TL494CDRG4 in existing designs?

A: Yes. The TL494CDR is a parametric equivalent with identical electrical specifications, operating temperature range, and switching frequency capability. No design modifications are required for direct substitution.

Q: What are the key differences between TL494CDR and the onsemi alternatives?

A: The primary differences are: (1) Operating temperature range—onsemi parts offer extended temperature ratings; (2) Synchronous rectifier integration—onsemi parts include this feature while TL494CDR does not; (3) Switching frequency and duty cycle specifications vary by part number. The TL494CDR maintains the closest electrical match to the original TL494CDRG4.

Q: Are all substitute parts available in 16-SOIC packaging?

A: Yes. All listed substitutes use 16-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring mechanical and electrical compatibility with existing PCB layouts.

Q: What is the difference between Digi-Reel, Cut Tape, and Tape & Reel packaging?

A: These are distribution formats for surface mount components. Digi-Reel and Tape & Reel are continuous reel formats suitable for automated assembly. Cut Tape is pre-cut tape suitable for manual or small-batch assembly. All formats contain the same die and are electrically identical.

Q: Which substitute should I select for extended temperature applications?

A: For applications requiring operation below 0°C or above 70°C, select from the onsemi alternatives: TL494BDR2G or NCV494BDR2G (-40°C ~ 125°C), or TL594CDR2G (-40°C ~ 85°C). Verify that the specific switching frequency and duty cycle specifications match your application requirements.

Q: Are all substitutes RoHS compliant?

A: Yes. All listed substitutes maintain ROHS3 compliance status, meeting environmental and regulatory requirements equivalent to the original TL494CDRG4.