TL494ING4 Equivalent & Substitute Parts

Part Overview

The TL494ING4 is a multi-topology DC-DC controller IC manufactured by Texas Instruments, designed for buck, boost, flyback, forward converter, full-bridge, half-bridge, and push-pull regulator applications. It provides positive output step-up, step-down, and step-up/step-down functionality through a transistor driver output configuration. The device is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and production needs.

Substiute Parts

TL494ING4

Texas InstrumentsIn Stock: 983TL494ING4 Datasheet

Current PartRFQ

TL494IN

onsemiIn Stock: 20445TL494IN Datasheet

MFR RecommendedRFQ

TL594INSR

Texas InstrumentsIn Stock: 6523TL594INSR Datasheet

MFR RecommendedRFQ

TL594IN

Texas InstrumentsIn Stock: 7158TL594IN Datasheet

MFR RecommendedRFQ

AZ494AP-E1

Diodes IncorporatedIn Stock: 35472AZ494AP-E1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL494ING4 is determined by the following critical parameters:

• Package and Mounting Type: Physical compatibility requires matching the 16-DIP through-hole package format
• Electrical Specifications: Supply voltage range (7V ~ 40V), switching frequency capability (1kHz ~ 300kHz minimum), and output configuration (positive, transistor driver)
• Functional Topology Support: Multi-topology capability including buck, boost, and push-pull configurations
• Control Features: Dead time control and frequency control functionality
• Operating Temperature Range: -40°C ~ 85°C compatibility
• Compliance Standards: RoHS3 compliance for modern production requirements

Substitute parts are grouped into two categories:

Category 1 - Direct Through-Hole DIP Equivalents: Parts maintaining the 16-DIP package format with multi-topology support and comparable electrical specifications.

Category 2 - Surface Mount Alternative: Parts with equivalent electrical functionality but different package format (16-SOIC), suitable for designs transitioning to surface mount technology.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - TL594IN (Texas Instruments)

The TL594IN is the preferred substitute for the TL494ING4. Both parts share identical electrical specifications, multi-topology support, and control features. The TL594IN maintains the 16-DIP through-hole package format and is currently in active production status with ROHS3 compliance. This part provides direct functional equivalence with improved duty cycle capability (97% vs. 45%), expanding design flexibility for existing applications.

Secondary Recommendation - TL594INSR (Texas Instruments)

The TL594INSR offers equivalent electrical functionality and is actively produced by Texas Instruments with ROHS3 compliance. This part differs in package format (16-SOIC surface mount) and is suitable for designs transitioning to surface mount assembly. The higher duty cycle (97%) provides additional design margin compared to the original TL494ING4.

Tertiary Option - TL494IN (onsemi)

The TL494IN from onsemi provides multi-topology support in the 16-DIP through-hole package. However, this part is marked as obsolete and carries RoHS non-compliance status, making it unsuitable for new production designs requiring modern compliance standards.

Limited Compatibility - AZ494AP-E1 (Diodes Incorporated)

The AZ494AP-E1 is a fixed-output buck regulator with limited topology support (buck only) and fixed 4.95V output. This part is not functionally equivalent to the TL494ING4 for multi-topology applications and is marked as obsolete. Selection of this part is restricted to legacy designs requiring only buck topology with fixed output voltage.

Frequently Asked Questions (FAQ)

Q: Can TL594IN directly replace TL494ING4 in existing designs?

A: Yes. The TL594IN maintains identical electrical specifications, multi-topology support, control features, and 16-DIP through-hole package format. No circuit modifications are required for functional equivalence.

Q: What is the difference between TL594IN and TL594INSR?

A: Both parts share identical electrical specifications and are manufactured by Texas Instruments. The primary difference is package format: TL594IN uses 16-DIP through-hole mounting, while TL594INSR uses 16-SOIC surface mount. Selection depends on PCB assembly technology and design requirements.

Q: Why does TL594IN have a higher maximum duty cycle (97%) than TL494ING4 (45%)?

A: The duty cycle specification reflects the maximum controllable range for each device variant. The TL594 series provides extended duty cycle capability, offering greater design flexibility for applications requiring higher duty cycle operation.

Q: Is AZ494AP-E1 suitable as a substitute for multi-topology applications?

A: No. The AZ494AP-E1 is a fixed-output buck regulator with single topology support and fixed 4.95V output. It is not functionally equivalent to the TL494ING4 for applications requiring boost, flyback, forward converter, full-bridge, half-bridge, or push-pull topologies.

Q: What compliance standards apply to substitute parts?

A: TL594IN and TL594INSR are ROHS3 compliant and actively produced, meeting modern regulatory requirements. TL494IN (onsemi) is RoHS non-compliant and obsolete. AZ494AP-E1 is ROHS3 compliant but obsolete. For new production, select only active, ROHS3-compliant parts.

Q: Are there inventory considerations for substitute selection?

A: TL594IN has 7,101 units in stock, TL594INSR has 6,489 units, and TL494IN (onsemi) has 20,400 units available. Inventory levels may vary by supplier and time. Verify current availability with component distributors before final design selection.