TL494CDG4 Equivalent & Substitute Parts

Part Overview

The TL494CDG4 is a DC-DC controller IC manufactured by Texas Instruments, designed for buck, boost, flyback, forward converter, full-bridge, half-bridge, and push-pull regulator topologies. It provides positive output step-up, step-down, and step-up/step-down conversion with dual transistor driver outputs. The part is discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives from active product lines or compatible substitutes that maintain electrical and mechanical compatibility.

Substiute Parts

TL494CDG4

Texas InstrumentsIn Stock: 3177TL494CDG4 Datasheet

Current PartRFQ

TL494CD

onsemiIn Stock: 6653TL494CD Datasheet

MFR RecommendedRFQ

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 TL494CDG4 is determined by the following critical parameters:

• Package compatibility: 16-SOIC form factor (0.154", 3.90mm Width)
• Supply voltage range: 7V ~ 40V
• Output configuration: Positive, transistor driver type
• Control features: Dead time control and frequency control capability
• Number of outputs: 2 outputs preferred for direct replacement
• Mounting type: Surface mount

Substitute parts are grouped into two categories:

Category A - Direct Functional Equivalents (Active Status): Parts with matching topology support, dual outputs, and active product status suitable for new designs.

Category B - Compatible Alternatives (Obsolete/Limited Status): Parts with compatible electrical parameters but discontinued or limited availability status.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: TL494CDR2G

The TL494CDR2G from onsemi is the preferred substitute for the TL494CDG4. It maintains identical electrical parameters within the critical operating range (7V ~ 40V supply, 200kHz switching frequency, 48% maximum duty cycle), dual transistor driver outputs, and 16-SOIC package compatibility. The part is in active production status with ROHS3 compliance and high inventory availability (17,400 units). Operating temperature range matches the original specification (0°C ~ 70°C).

Secondary Recommendation: TL494BDR2G

The TL494BDR2G provides equivalent electrical functionality with extended operating temperature range (-40°C ~ 125°C), ROHS3 compliance, and active product status. Switching frequency and duty cycle specifications are identical to TL494CDR2G. This option is suitable for applications requiring wider temperature operation. Inventory availability is 6,466 units.

Alternative for Extended Duty Cycle Applications: TL594CDR2G

The TL594CDR2G supports higher maximum duty cycle (96% versus 45% of the original), enabling different converter topologies. It maintains 300kHz maximum switching frequency, dual outputs, and ROHS3 compliance. Operating temperature range is -40°C ~ 85°C. This part is appropriate only when the higher duty cycle capability is required by the application design.

Not Recommended: NCV494BDR2G

While NCV494BDR2G is in active production with extended temperature range and ROHS3 compliance, it provides only a single output versus the dual outputs of the TL494CDG4. This configuration mismatch makes it unsuitable for direct replacement in applications requiring two independent transistor driver outputs.

Not Recommended: TL494CD

The TL494CD is obsolete and RoHS non-compliant, making it unsuitable for new designs or applications with regulatory compliance requirements.

Frequently Asked Questions (FAQ)

Q: Can TL494CDR2G directly replace TL494CDG4 in existing designs?

A: Yes. Both parts share identical 16-SOIC packaging, supply voltage range (7V ~ 40V), dual transistor driver outputs, and control features (dead time control, frequency control). The TL494CDR2G is manufactured by onsemi and is in active production status with ROHS3 compliance.

Q: What is the difference between TL494CDR2G and TL494BDR2G?

A: Both parts are electrically equivalent with identical switching frequency (200kHz) and duty cycle specifications (48% maximum). The primary difference is operating temperature range: TL494CDR2G operates 0°C ~ 70°C, while TL494BDR2G operates -40°C ~ 125°C. Select TL494BDR2G for applications requiring extended temperature operation.

Q: Why is TL594CDR2G listed as an alternative if it has different duty cycle specifications?

A: The TL594CDR2G supports 96% maximum duty cycle compared to 45% for the TL494CDG4. This difference enables different converter topologies and operating modes. It is listed as an alternative only for applications where the higher duty cycle capability is required by design specifications. For standard buck and push-pull converter applications, TL494CDR2G is the appropriate choice.

Q: Is NCV494BDR2G a suitable replacement?

A: No. Although NCV494BDR2G is in active production with extended temperature range and ROHS3 compliance, it provides only one transistor driver output. The TL494CDG4 provides two outputs. NCV494BDR2G is incompatible with designs requiring dual independent driver outputs.

Q: What packaging options are available for substitute parts?

A: TL494CDR2G and TL494BDR2G are supplied in Tape & Reel (TR) format. NCV494BDR2G is available in Cut Tape (CT) format. All maintain the 16-SOIC (0.154", 3.90mm Width) package form factor required for direct PCB compatibility.

Q: Are all recommended substitutes ROHS3 compliant?

A: Yes. TL494CDR2G, TL494BDR2G, TL594CDR2G, and NCV494BDR2G are all ROHS3 compliant. The TL494CD is RoHS non-compliant and is not recommended for new designs.

Q: What is the inventory status of recommended substitutes?

A: TL494CDR2G has 17,400 units in stock. TL494BDR2G has 6,466 units. TL594CDR2G has 17,545 units. All recommended parts have sufficient inventory for production requirements.