TL494CNG4 Equivalent & Substitute Parts

Part Overview

The TL494CNG4 is a PWM controller IC manufactured by Texas Instruments, designed for multiple DC-DC converter topologies including buck, boost, flyback, forward converter, full-bridge, half-bridge, and push-pull configurations. This component provides transistor driver outputs with integrated dead time control and frequency control features, supporting supply voltages from 7V to 40V and switching frequencies up to 300kHz.

The TL494CNG4 is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and production requirements. Alternative controllers with compatible electrical and mechanical specifications are available from multiple manufacturers.

Substiute Parts

TL494CNG4

Texas InstrumentsIn Stock: 977TL494CNG4 Datasheet

Current PartRFQ

TL494CN

onsemiIn Stock: 139122TL494CN 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

Substitute parts for the TL494CNG4 are qualified based on the following critical parameters:

• Package compatibility: 16-DIP (0.300", 7.62mm) form factor for direct pin-compatible replacement
• Mounting type: Through-hole technology for PCB integration
• Output configuration: Positive output transistor driver with 2 outputs
• Supply voltage range: 7V ~ 40V operation
• Control features: Dead time control and frequency control capability
• Topology support: Multi-topology support (buck, boost, flyback, forward converter, full-bridge, half-bridge, push-pull)

The following substitute parts meet these core electrical and mechanical requirements:

1. TL494CN (onsemi) - Pin-compatible controller with buck and push-pull topology support
2. TL594IN (Texas Instruments) - Enhanced controller with extended temperature range and higher duty cycle capability
3. AZ494AP-E1 (Diodes Incorporated) - Fixed-output buck regulator with reduced topology flexibility

Parameter Comparison

Engineering Selection Recommendations

TL594IN is the primary recommended substitute for the TL494CNG4. Both parts are manufactured by Texas Instruments and share identical multi-topology PWM controller architecture. The TL594IN maintains full compatibility with the original design while offering extended operating temperature range (-40°C to 85°C versus 0°C to 70°C) and higher maximum duty cycle (97% versus 45%). The TL594IN is currently active in production and ROHS3 compliant, ensuring long-term availability and regulatory compliance.

TL494CN (onsemi) provides pin-compatible substitution with identical supply voltage range and control features. However, this part is classified as obsolete and RoHS non-compliant, limiting its suitability for new designs or applications with environmental compliance requirements. Topology support is restricted to buck and push-pull configurations.

AZ494AP-E1 (Diodes Incorporated) is not recommended as a general substitute due to its fixed 4.95V output configuration and single buck topology support. This part is suitable only for applications requiring fixed-output buck regulation at 4.95V with 200mA output current and is classified as obsolete.

Frequently Asked Questions (FAQ)

Q: Can TL594IN directly replace TL494CNG4 in existing designs?

A: Yes. Both parts use identical 16-DIP pinout and share the same PWM controller architecture with multi-topology support. The TL594IN is pin-compatible and functionally equivalent for all topologies supported by the original design.

Q: What is the difference between TL494CN and TL594IN?

A: TL494CN is manufactured by onsemi and supports only buck and push-pull topologies, while TL594IN (Texas Instruments) supports all topologies including boost, flyback, forward converter, full-bridge, and half-bridge. TL594IN also offers extended temperature range and higher duty cycle capability. TL494CN is obsolete and RoHS non-compliant.

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

A: No. AZ494AP-E1 is a fixed-output buck regulator with 4.95V output and 200mA current rating. It does not provide the programmable control features or multi-topology flexibility of the TL494CNG4 and is suitable only for dedicated buck regulation applications.

Q: What are the compliance differences between substitute parts?

A: TL594IN and AZ494AP-E1 are ROHS3 compliant. TL494CN is RoHS non-compliant. For applications requiring environmental compliance certification, TL594IN is the appropriate choice.

Q: Does package compatibility guarantee functional substitution?

A: No. While all substitute parts use the 16-DIP package, functional compatibility depends on topology support, control features, and electrical specifications. TL594IN provides full functional equivalence. TL494CN and AZ494AP-E1 have reduced topology support and are not suitable for all applications.

Q: What is the impact of duty cycle differences on substitution?

A: The TL494CNG4 maximum duty cycle is 45%, while TL594IN supports 97%. This difference does not prevent substitution; the higher duty cycle capability of TL594IN provides additional design flexibility. Applications designed for 45% duty cycle operation will function correctly with TL594IN.