TL594CDR2 Equivalent & Substitute Parts

Part Overview

The TL594CDR2 is a Buck, Push-Pull Regulator controller IC manufactured by onsemi in the SWITCHMODE™ series. This device functions as a positive output step-down and step-up/step-down DC-DC controller with transistor driver output, housed in a 16-SOIC package. The TL594CDR2 is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Active alternatives with identical or compatible electrical and mechanical specifications are available from both onsemi and Texas Instruments.

Substiute Parts

TL594CDR2

onsemiIn Stock: 1061TL594CDR2 Datasheet

Current PartRFQ

TL594CDR2G

onsemiIn Stock: 17615TL594CDR2G Datasheet

DirectRFQ

AZ494CMTR-E1

Diodes IncorporatedIn Stock: 4557AZ494CMTR-E1 Datasheet

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TL494CD

onsemiIn Stock: 6653TL494CD Datasheet

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TL494CDR

Texas InstrumentsIn Stock: 496691TL494CDR Datasheet

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TL494ID

Texas InstrumentsIn Stock: 2163TL494ID Datasheet

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TL494IDR

Texas InstrumentsIn Stock: 215372TL494IDR Datasheet

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TL594CD

onsemiIn Stock: 1724TL594CD Datasheet

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TL594CDR

Texas InstrumentsIn Stock: 25131TL594CDR Datasheet

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TL594ID

Texas InstrumentsIn Stock: 1768TL594ID Datasheet

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TL594IDR

Texas InstrumentsIn Stock: 20232TL594IDR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TL594CDR2 is determined by the following critical parameters:

Primary Substitution Criteria:

• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Voltage - Supply (Vcc/Vdd): 7V ~ 40V
• Number of Outputs: 2
• Output Type: Transistor Driver
• Mounting Type: Surface Mount
• Control Features: Dead Time Control, Frequency Control

Substitution Categories:

Direct Equivalent (Identical Specifications): TL594CDR2G is the direct equivalent with identical electrical specifications, differing only in packaging format (Tape & Reel vs. standard packaging) and product status (Active vs. Obsolete). This part maintains 300kHz switching frequency, 96% maximum duty cycle, and synchronous rectifier functionality.

Compatible Substitutes (Same Base Topology, Extended Capability): TL494CDR, TL494ID, TL494IDR, TL594CDR, TL594ID, and TL594IDR are compatible substitutes based on the TL494/TL594 base product family. These parts share the 16-SOIC package, 7V ~ 40V supply voltage range, 2 outputs, transistor driver output type, and control features. However, they offer extended topology support (Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull) and wider switching frequency range (1kHz ~ 300kHz), providing greater design flexibility.

Functional Alternative (Different Topology): AZ494CMTR-E1 from Diodes Incorporated is a functional alternative with the same 16-SOIC package and 7V ~ 36V input range, but implements a fixed 5V buck topology with 200mA output current and 40kHz switching frequency. This part is suitable only for applications requiring fixed 5V output regulation.

Obsolete Reference (Not Recommended for New Designs): TL494CD and TL594CD are obsolete onsemi parts included for reference in legacy system documentation.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Recommended for New Designs): TL594CDR2G is the primary recommendation for new designs. It maintains identical electrical specifications and 16-SOIC package compatibility with the obsolete TL594CDR2, while offering active product status and ROHS3 compliance. The Tape & Reel packaging format is standard for production environments.

For Extended Topology Support: TL494IDR and TL594IDR from Texas Instruments are recommended when designs require flexibility beyond Buck and Push-Pull topologies. These parts support Boost, Flyback, Forward Converter, Full-Bridge, and Half-Bridge configurations with the same 16-SOIC package and 7V ~ 40V supply range. Both are ROHS3 compliant and active products with -40°C ~ 85°C operating temperature range.

For Temperature-Constrained Applications: TL494CDR and TL594CDR are suitable for applications with 0°C ~ 70°C operating temperature requirements, offering ROHS3 compliance and active status. TL494CDR provides the widest switching frequency range (1kHz ~ 300kHz) for flexible frequency control.

For Fixed Output Regulation: AZ494CMTR-E1 is applicable only for applications requiring fixed 5V output at 200mA with 40kHz switching frequency. This part is not suitable for variable output or higher current applications.

Compliance Considerations: All recommended active substitutes (TL594CDR2G, TL494CDR, TL494IDR, TL594CDR, TL594IDR) are ROHS3 compliant, addressing environmental and regulatory requirements that the obsolete TL594CDR2 does not meet.

Frequently Asked Questions (FAQ)

Q: Can TL594CDR2G be used as a direct replacement for TL594CDR2? A: Yes. TL594CDR2G is the direct equivalent with identical electrical specifications, 16-SOIC package, and functional characteristics. The only differences are packaging format (Tape & Reel) and product status (Active vs. Obsolete). It is the recommended replacement for new designs.

Q: What is the difference between TL494 and TL594 series controllers? A: Both series share the same base product family and 16-SOIC package. The TL594 series (TL594CDR2, TL594CDR2G, TL594CDR, TL594ID, TL594IDR) offers higher maximum duty cycle (96-97%) and synchronous rectifier support. The TL494 series (TL494CDR, TL494ID, TL494IDR) provides lower maximum duty cycle (45%) without synchronous rectifier. Selection depends on specific application requirements.

Q: Are Texas Instruments TL494/TL594 parts pin-compatible with onsemi TL594CDR2? A: Yes. All TL494 and TL594 variants maintain the same 16-SOIC package pinout and are functionally compatible. However, verify control feature requirements and operating temperature ranges for your specific application.

Q: Can I use AZ494CMTR-E1 as a substitute for TL594CDR2? A: No. AZ494CMTR-E1 is a fixed 5V buck regulator with 200mA output current and 40kHz switching frequency. It is not suitable for applications requiring variable output voltage, higher current capacity, or push-pull topology support. Use only for fixed 5V regulation applications.

Q: What are the key parameters that determine substitution compatibility? A: The critical parameters are: 16-SOIC package, 7V ~ 40V supply voltage range, 2 outputs, transistor driver output type, and dead time/frequency control features. Additional considerations include switching frequency range, duty cycle limits, synchronous rectifier support, operating temperature range, and RoHS compliance status.

Q: Why is RoHS compliance important for selecting a substitute? A: RoHS3 compliance is a regulatory requirement in many markets. The obsolete TL594CDR2 is RoHS non-compliant, while all active substitutes (TL594CDR2G, TL494CDR, TL494IDR, TL594CDR, TL594IDR) are ROHS3 compliant. New designs must use compliant parts to meet environmental and procurement standards.

Q: What is the difference between Cut Tape (CT) & Digi-Reel® and Tube packaging? A: Cut Tape & Digi-Reel® packaging is standard for high-volume production and automated assembly. Tube packaging is used for lower-volume or manual assembly applications. Both formats contain the same die and are electrically identical; packaging selection depends on manufacturing process requirements.

Q: Can I use TL494CDR or TL594CDR if my application requires 0°C ~ 70°C operating temperature? A: Yes. Both TL494CDR and TL594CDR are rated for 0°C ~ 70°C operating temperature. However, if your application requires -40°C ~ 85°C operation, use TL494IDR, TL594IDR, or TL594CDR2G instead.