TL494CDRE4 Equivalent & Substitute Parts

Part Overview

The TL494CDRE4 is a PWM controller IC from Texas Instruments designed for multiple DC-DC converter topologies including buck, boost, flyback, forward converter, full-bridge, half-bridge, and push-pull configurations. It provides transistor driver outputs with integrated dead time control and frequency control features, operating across a 7V to 40V supply voltage range with switching frequencies from 1kHz to 300kHz.

The TL494CDRE4 is discontinued at DiGi Electronics. Equivalent and substitute parts are available from active product lines, offering identical or enhanced electrical and mechanical compatibility for new designs and production requirements.

Substiute Parts

TL494CDRE4

Texas InstrumentsIn Stock: 1215TL494CDRE4 Datasheet

Current PartRFQ

TL494CDR

Texas InstrumentsIn Stock: 496691TL494CDR Datasheet

Parametric EquivalentRFQ

NCV494BDR2G

onsemiIn Stock: 1516NCV494BDR2G Datasheet

MFR RecommendedRFQ

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 TL494CDRE4 is determined by strict equivalence across the following critical parameters:

• Package / Case: 16-SOIC form factor (0.154", 3.90mm Width) — mechanical compatibility requirement
• Output Type: Transistor Driver — functional requirement
• Output Configuration: Positive — electrical requirement
• Voltage Supply Range: 7V ~ 40V minimum — operational requirement
• Control Features: Dead Time Control and Frequency Control — feature requirement
• Mounting Type: Surface Mount — assembly requirement
• RoHS Compliance: ROHS3 Compliant — regulatory requirement

Substitute parts are grouped into two categories:

1. Parametric Equivalent — Identical electrical and mechanical specifications
2. Manufacturer Recommended — Active alternatives with compatible or enhanced specifications

Parameter Comparison

Engineering Selection Recommendations

Primary Equivalent: TL494CDR

The TL494CDR from Texas Instruments is the direct parametric equivalent to the TL494CDRE4. It maintains identical electrical specifications, control features, and operating parameters while offering active product status with significantly higher inventory availability (496,630 units in stock). This part is suitable for direct replacement in all applications where the TL494CDRE4 was originally specified.

Alternative Substitutes: onsemi SWITCHMODE™ Series

The onsemi NCV494BDR2G, TL494BDR2G, TL494CDR2G, and TL594CDR2G represent manufacturer-recommended alternatives with active product status. These parts share the 16-SOIC package, positive output configuration, and core control features. Key differences include:

• NCV494BDR2G: Single output configuration; extended operating temperature range (-40°C ~ 125°C); fixed 40kHz switching frequency
• TL494BDR2G: Dual outputs; extended operating temperature range (-40°C ~ 125°C); 200kHz switching frequency; tape & reel packaging
• TL494CDR2G: Dual outputs; standard operating temperature range (0°C ~ 70°C); 200kHz switching frequency; tape & reel packaging
• TL594CDR2G: Dual outputs; extended duty cycle (96% maximum); 300kHz switching frequency; extended operating temperature range (-40°C ~ 85°C); tape & reel packaging

All substitute parts are ROHS3 compliant and carry identical regulatory certifications (REACH Unaffected, ECCN EAR99, HTSUS 8542.39.0001).

Frequently Asked Questions (FAQ)

Q: Can I use TL494CDR as a direct replacement for TL494CDRE4?

A: Yes. The TL494CDR is a parametric equivalent with identical electrical specifications, control features, and 16-SOIC package. The primary difference is product status (active vs. discontinued) and packaging format (cut tape & digi-reel vs. original packaging).

Q: What is the difference between TL494CDR2G and TL494CDR?

A: Both parts share identical electrical specifications and 16-SOIC packaging. The primary differences are manufacturer (onsemi vs. Texas Instruments) and packaging format (tape & reel vs. cut tape & digi-reel). Electrical performance and pin compatibility are equivalent.

Q: Why does TL594CDR2G have a 96% maximum duty cycle while TL494CDRE4 has 45%?

A: The TL594CDR2G is a variant within the SWITCHMODE™ series designed for applications requiring higher duty cycle operation. While this represents an enhanced capability, applications designed for the TL494CDRE4 operating at 45% duty cycle will function correctly with the TL594CDR2G. The higher duty cycle capability does not affect compatibility for existing designs.

Q: Are all substitute parts available in the same 16-SOIC package?

A: Yes. All listed substitute parts use the 16-SOIC (0.154", 3.90mm Width) package, ensuring mechanical and pin compatibility with the TL494CDRE4.

Q: What is the difference between operating temperature ranges listed as (TA) versus (TJ)?

A: (TA) refers to ambient temperature, while (TJ) refers to junction temperature. Both specifications define the operating temperature range for the device. Parts specified with (TJ) typically indicate a wider operational capability under controlled thermal conditions.

Q: Do all substitute parts support the same topologies as the TL494CDRE4?

A: The TL494CDRE4 supports buck, boost, flyback, forward converter, full-bridge, half-bridge, and push-pull topologies. The onsemi alternatives (NCV494BDR2G, TL494BDR2G, TL494CDR2G, TL594CDR2G) support buck and push-pull topologies. For applications requiring boost, flyback, forward converter, full-bridge, or half-bridge operation, the TL494CDR from Texas Instruments is the recommended substitute.

Q: Are all parts ROHS3 compliant?

A: Yes. The TL494CDRE4 and all listed substitute parts are ROHS3 compliant with moisture sensitivity level (MSL) 1 (Unlimited).