TL494IDRG4 Equivalent & Substitute Parts

Part Overview

The TL494IDRG4 is a Power Management IC (PMIC) functioning as a multi-topology DC-DC controller. This device is classified as discontinued at DiGi Electronics and supports buck, boost, flyback, forward converter, full-bridge, half-bridge, and push-pull topologies with positive output configuration. Due to its discontinued status, equivalent substitute parts with active product status are necessary for new designs and ongoing production requirements.

Key Parameters

Parameter	TL494IDRG4
Manufacturer	Texas Instruments
Package / Case	16-SOIC (0.154", 3.90mm Width)
Voltage - Supply (Vcc/Vdd)	7V ~ 40V
Frequency - Switching	1kHz ~ 300kHz
Duty Cycle (Max)	45%
Output Type	Transistor Driver
Number of Outputs	2
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics

Substitute Part Grouping Explanation

Substitution eligibility for the TL494IDRG4 is determined by the following critical parameters:

Package compatibility: 16-SOIC form factor (0.154", 3.90mm Width)
Supply voltage range: 7V ~ 40V
Output configuration: Positive output, transistor driver type
Mounting type: Surface mount
Environmental compliance: ROHS3 compliant

Substitute parts must maintain identical or superior electrical characteristics within these constraints. Variations in switching frequency range, duty cycle maximum, number of outputs, and operating temperature are permissible when the core topology and package remain compatible.

Parameter Comparison

Parameter	TL494IDRG4	TL494IDR	NCV494BDR2G	TL494BDR2G	TL494CDR2G	TL594CDR2G
Manufacturer	Texas Instruments	Texas Instruments	onsemi	onsemi	onsemi	onsemi
Package / Case	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
Frequency - Switching	1kHz ~ 300kHz	1kHz ~ 300kHz	40kHz	200kHz	200kHz	300kHz
Duty Cycle (Max)	45%	45%	48%	48%	48%	96%
Output Type	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver	Transistor Driver
Number of Outputs	2	2	1	2	2	2
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	0°C ~ 70°C (TA)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued	Active	Active	Active	Active	Active

Engineering Selection Recommendations

TL494IDR is the primary substitute for TL494IDRG4. Both parts are manufactured by Texas Instruments, share identical electrical specifications, and maintain the same 16-SOIC package. TL494IDR carries active product status with significantly higher inventory availability (215,300 units), ensuring supply chain continuity.

For applications requiring extended temperature operation beyond -40°C to 85°C, NCV494BDR2G and TL494BDR2G offer operating ranges to 125°C. Both are manufactured by onsemi under the SWITCHMODE™ series and maintain ROHS3 compliance.

TL594CDR2G provides the highest duty cycle capability (96% maximum) among available substitutes, supporting applications requiring extended on-time operation. This part maintains the full -40°C to 85°C temperature range and active product status.

TL494CDR2G is suitable for applications operating within 0°C to 70°C ambient conditions. This part offers the lowest operating temperature floor among the substitute options.

All substitute parts maintain ROHS3 compliance, REACH unaffected status, and identical EAR99 export classification as the original TL494IDRG4.

Frequently Asked Questions (FAQ)

Q: Can TL494IDR directly replace TL494IDRG4 in existing designs?

A: Yes. TL494IDR is electrically and mechanically identical to TL494IDRG4. Both share the same 16-SOIC package, supply voltage range (7V ~ 40V), switching frequency capability (1kHz ~ 300kHz), and operating temperature range (-40°C ~ 85°C). The primary difference is product status: TL494IDR is active with high inventory availability.

Q: What is the difference between TL494IDR and NCV494BDR2G?

A: Both parts maintain identical supply voltage and package specifications. NCV494BDR2G extends the operating temperature range to 125°C and includes synchronous rectifier capability. NCV494BDR2G supports a fixed switching frequency of 40kHz, whereas TL494IDR supports 1kHz ~ 300kHz. NCV494BDR2G is manufactured by onsemi under the SWITCHMODE™ series.

Q: Why does TL594CDR2G have a 96% maximum duty cycle compared to 45% for TL494IDRG4?

A: TL594CDR2G is a different base product number (TL594 versus TL494) with enhanced duty cycle capability. This specification difference reflects the device's design for applications requiring extended on-time operation. All other core parameters remain compatible for substitution purposes.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts (TL494IDR, NCV494BDR2G, TL494BDR2G, TL494CDR2G, TL594CDR2G) maintain ROHS3 compliance, matching the environmental certification of TL494IDRG4.

Q: Which substitute part should I select for a new design?

A: TL494IDR is the recommended primary choice for new designs. It provides identical specifications to TL494IDRG4 with active product status and maximum inventory availability. Select alternative substitutes only when specific application requirements (extended temperature range, higher duty cycle, or fixed switching frequency) necessitate their use.

Q: What is the packaging difference between TL494IDR and TL494BDR2G?

A: TL494IDR is supplied in Cut Tape (CT) & Digi-Reel® packaging. TL494BDR2G is supplied in Tape & Reel (TR) packaging. Both use the identical 16-SOIC component package. Packaging selection depends on production volume and assembly line requirements.

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