TL594IPWG4 Equivalent & Substitute Parts

Part Overview

The TL594IPWG4 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. This component provides transistor driver output with step-up, step-down, and step-up/step-down functionality for positive output applications.

The TL594IPWG4 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance of systems utilizing this controller.

Substiute Parts

TL594IPWG4

Texas InstrumentsIn Stock: 817TL594IPWG4 Datasheet

Current PartRFQ

TL594CDTBR2G

onsemiIn Stock: 5334TL594CDTBR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL594IPWG4 is determined by the following critical parameters:

Package Compatibility: The 16-TSSOP package is the primary mechanical constraint. Substitute parts must use the identical 16-TSSOP (0.173", 4.40mm Width) package to ensure PCB layout compatibility without redesign.

Electrical Specifications: Substitute parts must support the same supply voltage range (7V ~ 40V), output configuration (positive), and number of outputs (2). The switching frequency range, duty cycle capability, and control features (dead time control, frequency control) must be maintained or exceeded.

Functional Topology: Substitute parts must support the required converter topologies. The TL594IPWG4 supports Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, and Push-Pull topologies. Substitute parts must support at minimum the topologies required by the application.

Compliance and Status: RoHS3 compliance and MSL Level 1 are required for modern supply chain and manufacturing processes.

The TL594CDTBR2G from onsemi meets these substitution criteria with identical package, compatible electrical specifications, and active product status.

Parameter Comparison

Engineering Selection Recommendations

The TL594CDTBR2G from onsemi is the primary substitute for the obsolete TL594IPWG4. Both parts share identical package geometry, supply voltage range, output configuration, and operating temperature specifications. The substitute maintains RoHS3 compliance and MSL Level 1 rating, ensuring compatibility with current manufacturing and supply chain requirements.

The TL594CDTBR2G carries active product status, providing assured long-term availability and supply continuity compared to the obsolete TL594IPWG4. The substitute supports Buck and Push-Pull topologies with a fixed switching frequency of 300kHz, which covers the upper frequency range of the original part.

The maximum duty cycle of the substitute (96%) is marginally lower than the original (97%), which may require circuit evaluation if operation near maximum duty cycle is critical to the application.

The TL594CDTBR2G includes synchronous rectifier capability, which the original part does not provide. This feature does not create incompatibility and may offer efficiency improvements in applicable topologies.

Frequently Asked Questions (FAQ)

Q: Can the TL594CDTBR2G directly replace the TL594IPWG4 without PCB modifications?

A: Yes. Both parts use the identical 16-TSSOP package with matching pinout and electrical specifications. Direct pin-for-pin substitution is possible without PCB layout changes.

Q: What is the significance of the product status difference (Obsolete vs. Active)?

A: The TL594IPWG4 is obsolete and no longer manufactured by Texas Instruments. The TL594CDTBR2G is an active product with ongoing production and supply availability. Using an active substitute ensures long-term component availability and reduces supply chain risk.

Q: Are there differences in switching frequency capability between these parts?

A: The TL594IPWG4 supports a switching frequency range of 1kHz to 300kHz. The TL594CDTBR2G operates at a fixed frequency of 300kHz. Applications requiring operation below 300kHz must be evaluated to confirm compatibility with the fixed-frequency operation of the substitute.

Q: Does the synchronous rectifier feature in the TL594CDTBR2G affect compatibility?

A: No. The synchronous rectifier is an additional feature that does not create incompatibility. Applications not utilizing this feature will operate normally. Applications that can utilize synchronous rectification may benefit from improved efficiency.

Q: What is the impact of the 1% difference in maximum duty cycle?

A: The TL594IPWG4 supports 97% maximum duty cycle; the TL594CDTBR2G supports 96%. For applications operating near maximum duty cycle, circuit performance must be evaluated to confirm the 1% reduction does not impact system requirements.

Q: Are both parts RoHS3 compliant?

A: Yes. Both the TL594IPWG4 and TL594CDTBR2G are RoHS3 compliant with MSL Level 1 rating, meeting current environmental and manufacturing standards.