TL494ING Equivalent & Substitute Parts

Part Overview

The TL494ING is a Buck, Push-Pull Regulator controller IC manufactured by onsemi in the SWITCHMODE™ series. This part operates as a Transistor Driver for Step-Down and Step-Up/Step-Down DC-DC conversion topologies with dual outputs and single phase operation. The TL494ING is classified as Obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Alternatives must maintain compatibility across core electrical parameters including supply voltage range (7V–40V), switching frequency (200kHz), duty cycle (48% maximum), and control features (Dead Time Control, Frequency Control).

Substiute Parts

TL494ING

onsemiIn Stock: 865TL494ING Datasheet

Current PartRFQ

TL494CDR2G

onsemiIn Stock: 17458TL494CDR2G Datasheet

DirectRFQ

AZ494AP-E1

Diodes IncorporatedIn Stock: 35472AZ494AP-E1 Datasheet

SimilarRFQ

TL494CN

onsemiIn Stock: 139122TL494CN Datasheet

SimilarRFQ

TL494IN

onsemiIn Stock: 20445TL494IN Datasheet

SimilarRFQ

TL594CN

onsemiIn Stock: 9496TL594CN Datasheet

SimilarRFQ

TL594IN

Texas InstrumentsIn Stock: 7158TL594IN Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TL494ING are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Package Variant): Parts that maintain identical electrical specifications and control topology but differ in packaging format. These allow design flexibility while preserving circuit functionality.

Similar Substitutes (Functional Equivalents): Parts that share core DC-DC controller functionality and key electrical parameters but may have variations in switching frequency, duty cycle, temperature range, or topology support. These require design review to confirm compatibility with the target application.

The primary substitution criteria are:

• Voltage supply range (7V–40V minimum)
• Output type (Transistor Driver)
• Control features (Dead Time Control, Frequency Control)
• Number of outputs (2)
• Package compatibility (Through Hole 16-DIP or Surface Mount 16-SOIC)
• Operating temperature range (-40°C to 85°C preferred for industrial applications)

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution (Same Electrical Specifications):

TL494CDR2G is the recommended direct substitute when surface mount packaging is acceptable. It maintains identical electrical specifications (7V–40V supply, 200kHz switching, 48% duty cycle, dual Transistor Driver outputs) and is currently Active with ROHS3 compliance. The primary difference is package format (16-SOIC surface mount versus 16-DIP through hole) and operating temperature range (0°C–70°C versus -40°C–85°C). This part is suitable for new designs requiring RoHS compliance and modern manufacturing processes.

TL494CN and TL494IN are pin-compatible through-hole alternatives with identical electrical specifications. Both are Obsolete but maintain the same 16-DIP package, 200kHz switching frequency, and 48% duty cycle. TL494IN supports the full industrial temperature range (-40°C–85°C), matching the TL494ING specification. TL494CN operates at 0°C–70°C. These parts are suitable for legacy system maintenance where through-hole mounting is required.

For Functional Equivalence (Extended Capability):

TL594CN and TL594IN offer extended switching frequency capability (300kHz for TL594CN, 1kHz–300kHz for TL594IN) and higher duty cycle (96% and 97% respectively). TL594IN is Active and ROHS3 compliant, manufactured by Texas Instruments, supporting the full industrial temperature range. This part is suitable for applications requiring higher frequency operation or greater duty cycle flexibility. The TL594 series supports multiple topologies (Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull) providing design flexibility beyond the TL494 series.

For Cost-Optimized Substitution:

AZ494AP-E1 (Diodes Incorporated) is a fixed-output Buck regulator (4.95V, 200mA) in 16-DIP through-hole package. This part is functionally limited compared to the TL494ING (fixed output versus programmable, lower current rating, Buck topology only) and is suitable only for applications with fixed 4.95V output requirements. It is Obsolete but ROHS3 compliant.

Compliance Considerations:

For new designs requiring RoHS3 compliance, TL594IN (Texas Instruments, Active) or TL494CDR2G (onsemi, Active) are the preferred selections. Both are currently manufactured and meet modern environmental standards. For legacy system support where RoHS compliance is not required, TL494IN or TL494CN provide direct electrical equivalence in through-hole packaging.

Frequently Asked Questions (FAQ)

Q: Can TL494CDR2G replace TL494ING directly in existing PCB designs?

A: TL494CDR2G is electrically equivalent but requires PCB redesign due to package format change (16-SOIC surface mount versus 16-DIP through hole). Pin assignments differ between package types. The operating temperature range is also narrower (0°C–70°C versus -40°C–85°C), which may affect industrial or extended-temperature applications.

Q: What is the key difference between TL494 and TL594 series controllers?

A: The TL594 series supports extended switching frequency (up to 300kHz versus 200kHz) and higher duty cycle (up to 97% versus 48%). The TL594 also supports additional topologies including Boost, Flyback, Forward Converter, Full-Bridge, and Half-Bridge, whereas the TL494 is limited to Buck and Push-Pull. The TL594IN is currently Active and ROHS3 compliant, making it suitable for new designs requiring extended capability.

Q: Is TL494IN suitable for industrial temperature applications?

A: Yes. TL494IN supports the full industrial temperature range (-40°C–85°C), matching the TL494ING specification. However, TL494IN is Obsolete. For active production, TL594IN (Texas Instruments) is the recommended alternative, offering the same temperature range, Active status, and ROHS3 compliance.

Q: Can AZ494AP-E1 be used as a general-purpose substitute for TL494ING?

A: No. AZ494AP-E1 is a fixed-output Buck regulator (4.95V, 200mA) and is not suitable as a general substitute. It lacks programmable output voltage, frequency control, and support for Step-Up/Step-Down topologies. Use AZ494AP-E1 only in applications with fixed 4.95V output requirements.

Q: What compliance certifications should I verify for new production?

A: For new designs, verify ROHS3 compliance and Active product status. TL594IN (Texas Instruments) and TL494CDR2G (onsemi) are both Active and ROHS3 compliant. All parts listed are REACH Unaffected and classified as EAR99 for export control purposes.

Q: Are there pin-compatible alternatives in the same 16-DIP package?

A: Yes. TL494CN, TL494IN, TL594CN, and TL594IN are all available in 16-DIP through-hole packaging with identical pin assignments. TL494CN and TL494IN provide direct electrical equivalence to TL494ING. TL594CN and TL594IN offer extended frequency and duty cycle capability with the same pinout.