TL494IDRE4 Equivalent & Substitute Parts

Part Overview

The TL494IDRE4 is a Power Management IC (PMIC) functioning as a multi-topology DC-DC controller from Texas Instruments. This device supports Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, and Push-Pull topologies with positive output configuration and dual outputs. The TL494IDRE4 is currently discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and production continuity. Active alternatives with compatible electrical and mechanical specifications are available from Texas Instruments and onsemi.

Substiute Parts

TL494IDRE4

Texas InstrumentsIn Stock: 1079TL494IDRE4 Datasheet

Current PartRFQ

TL494IDR

Texas InstrumentsIn Stock: 215372TL494IDR Datasheet

MFR RecommendedRFQ

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

Substitute parts for the TL494IDRE4 are qualified based on the following electrical and mechanical compatibility criteria:

Primary Compatibility Parameters:

• Package / Case: 16-SOIC (0.154", 3.90mm Width) — all substitutes maintain identical pinout and form factor
• Voltage - Supply (Vcc/Vdd): 7V ~ 40V — all substitutes operate within this range
• Output Configuration: Positive — all substitutes maintain positive output configuration
• Output Type: Transistor Driver — all substitutes function as transistor drivers
• Control Features: Dead Time Control, Frequency Control — all substitutes include these control features
• Mounting Type: Surface Mount — all substitutes are surface-mount devices
• RoHS Status: ROHS3 Compliant — all substitutes meet RoHS3 compliance
• Moisture Sensitivity Level (MSL): 1 (Unlimited) — all substitutes have MSL 1

Topology and Function Variations: Substitute parts differ in supported topologies and output count. The TL494IDRE4 supports the broadest topology range (Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull) with 2 outputs. Some substitutes support a subset of these topologies (Buck, Push-Pull) with varying output counts. Selection depends on the specific topology required in the application.

Switching Frequency and Duty Cycle: The TL494IDRE4 operates at 1kHz ~ 300kHz with 45% maximum duty cycle. Substitute parts operate at fixed or variable switching frequencies (40kHz, 200kHz, or 300kHz) with duty cycles ranging from 45% to 96%. Application requirements determine the appropriate substitute based on frequency and duty cycle specifications.

Operating Temperature Range: The TL494IDRE4 operates from -40°C ~ 85°C (TA). Substitutes operate within -40°C ~ 125°C (TJ) or 0°C ~ 70°C (TA) ranges. Temperature range selection depends on application environment requirements.

Product Status: The TL494IDRE4 is discontinued. All listed substitutes are active products with current inventory availability.

Parameter Comparison

Engineering Selection Recommendations

TL494IDR (Texas Instruments) This is the manufacturer-recommended direct substitute from Texas Instruments. It maintains identical electrical specifications to the TL494IDRE4, including the full topology support range (Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull), dual outputs, and switching frequency range of 1kHz ~ 300kHz. The TL494IDR is active with high inventory availability (215,300 pcs). This part is the preferred choice for direct replacement when topology flexibility and frequency range are required.

TL494BDR2G (onsemi) This onsemi alternative supports Buck and Push-Pull topologies with dual outputs and 200kHz switching frequency. It includes synchronous rectifier capability and operates at -40°C ~ 125°C (TJ). This part is suitable for applications requiring Buck or Push-Pull topologies at fixed 200kHz frequency with extended temperature range. Inventory availability is 6,466 pcs.

TL494CDR2G (onsemi) This onsemi part provides Buck and Push-Pull topology support with dual outputs and 200kHz switching frequency. It includes synchronous rectifier capability but operates at a narrower temperature range of 0°C ~ 70°C (TA). This part is suitable for commercial-grade applications requiring Buck or Push-Pull topologies at 200kHz. Inventory availability is 17,400 pcs.

TL594CDR2G (onsemi) This onsemi variant supports Buck and Push-Pull topologies with dual outputs and 300kHz switching frequency. It features the highest maximum duty cycle at 96% and includes synchronous rectifier capability. This part is suitable for applications requiring higher switching frequency (300kHz) and higher duty cycle operation. Inventory availability is 17,545 pcs.

NCV494BDR2G (onsemi) This onsemi part supports Buck and Push-Pull topologies with a single output and fixed 40kHz switching frequency. It includes synchronous rectifier capability and operates at -40°C ~ 125°C (TJ). This part is suitable for single-output applications requiring lower switching frequency (40kHz) with extended temperature range. Inventory availability is 1,452 pcs.

Selection Criteria:

• For maximum topology flexibility and frequency range: TL494IDR
• For extended temperature operation (-40°C ~ 125°C): TL494BDR2G or NCV494BDR2G
• For commercial temperature range (0°C ~ 70°C): TL494CDR2G
• For higher switching frequency (300kHz) and duty cycle (96%): TL594CDR2G
• For single-output applications: NCV494BDR2G

All substitutes are ROHS3 compliant, MSL 1, and surface-mount 16-SOIC packages.

Frequently Asked Questions (FAQ)

Q: Can TL494IDR be used as a direct replacement for TL494IDRE4? A: Yes. The TL494IDR is the manufacturer-recommended substitute from Texas Instruments. It maintains identical electrical specifications including supply voltage range (7V ~ 40V), switching frequency range (1kHz ~ 300kHz), maximum duty cycle (45%), and supports all topologies (Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull) with dual outputs. The 16-SOIC package and pinout are identical.

Q: What is the difference between TL494BDR2G and TL494CDR2G? A: Both parts support Buck and Push-Pull topologies with dual outputs and 200kHz switching frequency. The primary difference is operating temperature range: TL494BDR2G operates at -40°C ~ 125°C (TJ), while TL494CDR2G operates at 0°C ~ 70°C (TA). Select TL494BDR2G for extended temperature applications and TL494CDR2G for commercial-grade applications.

Q: Why does TL594CDR2G have a 96% maximum duty cycle while others have 45-48%? A: The TL594CDR2G is a variant with different internal design specifications. The 96% maximum duty cycle allows for different converter topologies and operating modes. This specification is provided in the datasheet and determines which applications are suitable for this part.

Q: Can NCV494BDR2G replace TL494IDRE4 in all applications? A: No. The NCV494BDR2G has a single output compared to the TL494IDRE4's dual outputs, and supports only Buck and Push-Pull topologies compared to the full range supported by TL494IDRE4. It is suitable only for single-output applications using Buck or Push-Pull topologies.

Q: Are all substitute parts in the same 16-SOIC package? A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) package with identical pinout and form factor, enabling direct PCB replacement.

Q: What is the inventory status of these substitute parts? A: All substitute parts are active products with current inventory: TL494IDR (215,300 pcs), TL494BDR2G (6,466 pcs), TL494CDR2G (17,400 pcs), TL594CDR2G (17,545 pcs), and NCV494BDR2G (1,452 pcs).

Q: Do all substitutes meet RoHS3 compliance? A: Yes. All substitute parts listed are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity level, matching the compliance profile of the TL494IDRE4.