TL494CDG Equivalent & Substitute Parts

Part Overview

The TL494CDG is a Buck, Push-Pull Regulator controller IC manufactured by onsemi in 16-SOIC surface mount packaging. This part operates as a positive output step-down and step-up/step-down DC-DC controller with dual outputs and integrated dead time control and frequency control features. The TL494CDG is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain compatibility across core electrical parameters including supply voltage range, switching frequency capability, duty cycle limits, and output topology support.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL494CDG
Manufacturer	onsemi
Category	Power Management (PMIC)
Package / Case	16-SOIC (0.154", 3.90mm Width)
Voltage - Supply (Vcc/Vdd)	7V ~ 40V
Frequency - Switching	200kHz
Duty Cycle (Max)	48%
Output Type	Transistor Driver
Function	Step-Down, Step-Up/Step-Down
Topology	Buck, Push-Pull
Number of Outputs	2
Operating Temperature	0°C ~ 70°C (TA)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TL494CDG is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Package compatibility: 16-SOIC (0.154", 3.90mm Width) surface mount only
Supply voltage range: 7V ~ 40V minimum requirement
Output configuration: Positive output only
Number of outputs: 2 outputs required
Output type: Transistor driver configuration
Control features: Dead time control and frequency control required

Secondary Compatibility Factors:

Switching frequency capability: Must support 200kHz operation
Duty cycle maximum: Must support at least 48% duty cycle
Topology support: Buck and Push-Pull topologies required
Synchronous rectifier: Yes (preferred for efficiency)

Parts that deviate from these core parameters are classified as limited substitutes or non-substitutes based on functional differences.

Parameter Comparison

Parameter	TL494CDG	TL494CDR2G	TL494CD	TL494CDR	TL494ID	TL494IDR	TL594CD	TL594CDR	TL594ID	TL594IDR
Manufacturer	onsemi	onsemi	onsemi	Texas Instruments	Texas Instruments	Texas Instruments	onsemi	Texas Instruments	Texas Instruments	Texas Instruments
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Voltage - Supply (Vcc/Vdd)	7V ~ 40V	7V ~ 40V	7V ~ 40V	7V ~ 40V	7V ~ 40V	7V ~ 40V	7V ~ 40V	7V ~ 40V	7V ~ 40V	7V ~ 40V
Frequency - Switching	200kHz	200kHz	200kHz	1kHz ~ 300kHz	1kHz ~ 300kHz	1kHz ~ 300kHz	300kHz	1kHz ~ 300kHz	1kHz ~ 300kHz	1kHz ~ 300kHz
Duty Cycle (Max)	48%	48%	48%	45%	45%	45%	96%	97%	97%	97%
Output Type	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver
Function	Step-Down, Step-Up/Step-Down	Step-Down, Step-Up/Step-Down	Step-Down, Step-Up/Step-Down	Step-Up, Step-Down, Step-Up/Step-Down	Step-Up, Step-Down, Step-Up/Step-Down	Step-Up, Step-Down, Step-Up/Step-Down	Step-Down, Step-Up/Step-Down	Step-Up, Step-Down, Step-Up/Step-Down	Step-Up, Step-Down, Step-Up/Step-Down	Step-Up, Step-Down, Step-Up/Step-Down
Topology	Buck, Push-Pull	Buck, Push-Pull	Buck, Push-Pull	Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull	Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull	Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull	Buck, Push-Pull	Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull	Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull	Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
Number of Outputs	2	2	2	2	2	2	2	2	2	2
Output Configuration	Positive	Positive	Positive	Positive	Positive	Positive	Positive	Positive	Positive	Positive
Synchronous Rectifier	Yes	Yes	Yes	No	No	No	Yes	No	No	No
Operating Temperature	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	0°C ~ 70°C	-40°C ~ 85°C	-40°C ~ 85°C
Product Status	Obsolete	Active	Obsolete	Active	Active	Active	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (Highest Compatibility):

TL494CDR2G and TL494CD are direct electrical equivalents to TL494CDG. Both maintain identical supply voltage range (7V ~ 40V), switching frequency (200kHz), duty cycle maximum (48%), and topology support (Buck, Push-Pull). TL494CDR2G is preferred as it carries Active product status and ROHS3 compliance, whereas TL494CD is obsolete and RoHS non-compliant.

Primary Substitutes (Full Functional Compatibility):

TL494CDR, TL494ID, and TL494IDR are manufactured by Texas Instruments and provide expanded topology support including Boost, Flyback, Forward Converter, Full-Bridge, and Half-Bridge configurations. These parts maintain the required 7V ~ 40V supply voltage range and 2-output configuration. The switching frequency range extends to 1kHz ~ 300kHz, accommodating the 200kHz requirement. Duty cycle maximum is 45%, which is lower than the TL494CDG specification of 48%. All three carry Active product status and ROHS3 compliance. TL494IDR and TL494ID support extended operating temperature range (-40°C ~ 85°C) compared to the TL494CDG (0°C ~ 70°C).

Secondary Substitutes (Functional Differences):

TL594CD, TL594CDR, TL594ID, and TL594IDR are based on the TL594 controller platform. These parts support higher duty cycle maximums (96% to 97%) and extended switching frequency ranges (1kHz ~ 300kHz). TL594CDR, TL594ID, and TL594IDR carry Active product status and ROHS3 compliance. TL594CD is obsolete and RoHS non-compliant. The TL594 series lacks synchronous rectifier integration present in the TL494CDG, affecting efficiency characteristics in certain topologies.

Limited Substitute (Functional Deviation):

AZ494CMTR-E1 manufactured by Diodes Incorporated is a fixed-output buck regulator with 5V output and 200mA current rating. This part deviates significantly from the TL494CDG controller architecture, as it is a complete regulator rather than a controller IC. Substitution is applicable only in applications where fixed 5V output at 200mA meets system requirements.

Frequently Asked Questions (FAQ)

Q: Can TL494CDR replace TL494CDG directly in existing designs?

A: TL494CDR is electrically compatible with TL494CDG for applications requiring Buck and Push-Pull topologies within the 7V ~ 40V supply range and 200kHz switching frequency. The duty cycle maximum of 45% is lower than TL494CDG's 48%, which may affect designs operating near the upper duty cycle limit. TL494CDR supports extended operating temperature range (-40°C ~ 85°C) and carries Active product status with ROHS3 compliance.

Q: What is the difference between TL494 and TL594 controller series?

A: The TL494 series supports duty cycle maximums of 45% to 48%, while the TL594 series supports 96% to 97% duty cycle maximums. The TL594 series provides extended switching frequency ranges (1kHz ~ 300kHz) compared to fixed 200kHz or 300kHz in specific TL494 variants. Both series maintain identical 16-SOIC packaging and 7V ~ 40V supply voltage range. The TL594 series lacks synchronous rectifier integration.

Q: Is packaging compatibility guaranteed across all substitute parts?

A: All listed substitute parts use 16-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring mechanical and electrical pin compatibility. Pinout compatibility must be verified against specific application schematics, as controller IC pinouts are standardized within each manufacturer's product line.

Q: What is the impact of losing synchronous rectifier functionality?

A: The TL494CDG integrates synchronous rectifier control, while Texas Instruments TL494 variants (TL494CDR, TL494ID, TL494IDR) and all TL594 series parts do not. Synchronous rectifier integration reduces conduction losses in buck converter topologies. Designs relying on this feature must implement external synchronous rectifier control or accept reduced efficiency when substituting with non-synchronous variants.

Q: Can TL594CDR be used in applications designed for TL494CDG?

A: TL594CDR is functionally compatible for applications using Buck and Push-Pull topologies within the 7V ~ 40V supply range. The higher duty cycle maximum (97% vs. 48%) and extended switching frequency range (1kHz ~ 300kHz) provide design flexibility. However, the absence of synchronous rectifier integration and lower duty cycle maximum of 45% in the TL494CDR variant may require circuit modifications. TL594CDR carries Active product status and ROHS3 compliance.

Q: What compliance considerations apply to substitute part selection?

A: TL494CDR2G, TL494CDR, TL494ID, TL494IDR, TL594CDR, TL594ID, and TL594IDR carry ROHS3 compliance and Active product status, making them suitable for new designs and production environments with RoHS requirements. TL494CD and TL594CD are RoHS non-compliant and obsolete, limiting their use to legacy applications or environments without RoHS mandates. All parts maintain REACH Unaffected status and EAR99 export classification.

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