TL594IDRG4 Equivalent & Substitute Parts

Part Overview

The TL594IDRG4 is a DC-DC controller IC manufactured by Texas Instruments, designed for multiple converter topologies including Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, and Push-Pull configurations. It functions as a transistor driver with positive output capability for step-up, step-down, and step-up/step-down applications. The TL594IDRG4 is currently discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements.

Substiute Parts

TL594IDRG4

Texas InstrumentsIn Stock: 5457TL594IDRG4 Datasheet

Current PartRFQ

TL594IDR

Texas InstrumentsIn Stock: 20232TL594IDR Datasheet

Parametric EquivalentRFQ

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 TL594IDRG4 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Package / Case: 16-SOIC form factor (0.154", 3.90mm Width)
• Voltage - Supply (Vcc/Vdd): 7V ~ 40V range
• Output Type: Transistor Driver
• Output Configuration: Positive
• Number of Outputs: 2
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Functional Compatibility Parameters:

• Function: Step-Up, Step-Down, Step-Up/Step-Down capability
• Topology support: Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
• Control Features: Dead Time Control, Frequency Control

Substitute parts are grouped based on whether they maintain these core parameters while potentially varying in switching frequency range, duty cycle maximum, operating temperature range, and product status.

Parameter Comparison

Engineering Selection Recommendations

TL594IDR (Parametric Equivalent)

The TL594IDR is the direct parametric equivalent to the TL594IDRG4. Both are Texas Instruments products with identical electrical specifications, including 7V ~ 40V supply voltage, 1kHz ~ 300kHz switching frequency range, 97% maximum duty cycle, and -40°C ~ 85°C operating temperature. The TL594IDR is currently active in production, making it the primary replacement for discontinued TL594IDRG4 applications. Both parts maintain full topology support (Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull) and identical control features. ROHS3 compliance and MSL 1 ratings are maintained.

TL594CDR2G (onsemi Equivalent)

The TL594CDR2G is an onsemi SWITCHMODE™ series controller offering near-equivalent performance with minor parameter variations. It maintains the 7V ~ 40V supply voltage, 16-SOIC package, and -40°C ~ 85°C operating temperature range. The switching frequency extends to 300kHz with 96% maximum duty cycle, providing compatibility with high-frequency applications. The TL594CDR2G includes synchronous rectifier capability, which the TL594IDRG4 does not have. Topology support is limited to Buck and Push-Pull configurations. ROHS3 compliance and MSL 1 ratings are maintained. This part is suitable for applications not requiring Boost, Flyback, Forward Converter, Full-Bridge, or Half-Bridge topologies.

TL494BDR2G and TL494CDR2G (onsemi Alternatives)

The TL494BDR2G and TL494CDR2G are onsemi SWITCHMODE™ series controllers with reduced topology support (Buck and Push-Pull only) and lower maximum duty cycle (48%). The TL494BDR2G operates at -40°C ~ 125°C (TJ), while TL494CDR2G operates at 0°C ~ 70°C (TA). Both include synchronous rectifier capability and fixed 200kHz switching frequency. These parts are suitable only for applications requiring Buck or Push-Pull topologies within their respective temperature ranges. ROHS3 compliance and MSL 1 ratings are maintained.

Frequently Asked Questions (FAQ)

Q: Can TL594IDR directly replace TL594IDRG4 in existing designs?

A: Yes. The TL594IDR is a parametric equivalent with identical electrical specifications, package, and operating temperature range. No design modifications are required for direct substitution.

Q: What are the key differences between TL594IDRG4 and TL594CDR2G?

A: Both maintain 7V ~ 40V supply voltage, 16-SOIC package, and -40°C ~ 85°C operating temperature. The TL594CDR2G is manufactured by onsemi under the SWITCHMODE™ series and includes synchronous rectifier capability. Topology support differs: TL594IDRG4 supports Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, and Push-Pull, while TL594CDR2G supports only Buck and Push-Pull. Maximum duty cycle is 96% for TL594CDR2G versus 97% for TL594IDRG4.

Q: Are TL494 series parts suitable replacements for TL594IDRG4?

A: TL494 series parts (TL494BDR2G and TL494CDR2G) have limited topology support restricted to Buck and Push-Pull configurations. They are suitable only if your application uses exclusively these topologies. Maximum duty cycle is reduced to 48%, and switching frequency is fixed at 200kHz. Operating temperature ranges differ between variants.

Q: What is the significance of the 16-SOIC package specification?

A: The 16-SOIC (0.154", 3.90mm Width) package is a surface-mount standard that ensures mechanical and electrical compatibility across all listed substitute parts. All equivalent and substitute parts maintain this package specification, allowing direct PCB footprint compatibility without layout modifications.

Q: Do all substitute parts maintain ROHS3 compliance?

A: Yes. All listed substitute parts (TL594IDR, TL494BDR2G, TL494CDR2G, and TL594CDR2G) are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the TL594IDRG4 environmental and regulatory specifications.

Q: What is the difference between TL494BDR2G and TL494CDR2G operating temperatures?

A: TL494BDR2G operates at -40°C ~ 125°C (TJ, junction temperature), providing extended high-temperature capability. TL494CDR2G operates at 0°C ~ 70°C (TA, ambient temperature), with a narrower operating range. Selection depends on your application's thermal environment and temperature requirements.

Q: Can I use TL594CDR2G in applications requiring Boost or Flyback topologies?

A: No. TL594CDR2G supports only Buck and Push-Pull topologies. If your design requires Boost, Flyback, Forward Converter, Full-Bridge, or Half-Bridge topologies, use TL594IDR or TL594IDRG4 instead.