TL594CDR2G Equivalent & Substitute Parts

Part Overview

The TL594CDR2G is an onsemi SWITCHMODE™ buck and push-pull regulator controller IC in 16-SOIC surface mount packaging. This device functions as a positive output step-down and step-up/step-down DC-DC controller with transistor driver output configuration. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the TL594CDR2G becomes unavailable due to supply constraints, when alternative packaging formats are required for manufacturing processes, or when design requirements permit operation within the electrical and thermal parameters of equivalent controllers from the same product family.

Key Parameters

Parameter	TL594CDR2G Specification
Manufacturer	onsemi
Base Product Number	TL594
Package / Case	16-SOIC (0.154", 3.90mm Width)
Voltage - Supply (Vcc/Vdd)	7V ~ 40V
Frequency - Switching	300kHz
Duty Cycle (Max)	96%
Operating Temperature	-40°C ~ 85°C (TA)
Output Type	Transistor Driver
Function	Step-Down, Step-Up/Step-Down
Topology	Buck, Push-Pull
Number of Outputs	2
Synchronous Rectifier	Yes
Control Features	Dead Time Control, Frequency Control
RoHS Status	ROHS3 Compliant
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the TL594CDR2G is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 16-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB footprint compatibility without layout redesign.

Supply Voltage Range: The 7V ~ 40V supply voltage specification must be met or exceeded by substitute parts to maintain circuit operation within the intended power delivery range.

Output Configuration: All substitutes must provide positive output configuration with transistor driver output type to ensure gate drive signal compatibility with downstream power stage components.

Topology Support: Substitute parts must support at minimum the buck and push-pull topologies required by the TL594CDR2G application, though broader topology support does not preclude substitution.

Control Features: Dead time control and frequency control capabilities must be present in substitute parts to maintain design functionality.

Operating Temperature Range: Substitutes with operating temperature ranges that encompass or exceed the -40°C ~ 85°C specification are acceptable for applications operating within this thermal envelope.

Compliance Requirements: For new designs and production environments requiring regulatory compliance, RoHS3 compliance status is a determining factor for part selection.

Parameter Comparison

Part Number	Manufacturer	Packaging	Vcc/Vdd (V)	Switching Freq (kHz)	Duty Cycle Max (%)	Temp Range (°C)	Synchronous Rectifier	RoHS Status	Product Status
TL594CDR2G	onsemi	Tape & Reel (TR)	7 ~ 40	300	96	-40 ~ 85	Yes	ROHS3 Compliant	Active
TL594CDR	Texas Instruments	Cut Tape (CT) & Digi-Reel®	7 ~ 40	1 ~ 300	97	0 ~ 70	No	ROHS3 Compliant	Active
TL594ID	Texas Instruments	Tube	7 ~ 40	1 ~ 300	97	-40 ~ 85	No	ROHS3 Compliant	Active
TL594IDR	Texas Instruments	Cut Tape (CT) & Digi-Reel®	7 ~ 40	1 ~ 300	97	-40 ~ 85	No	ROHS3 Compliant	Active
TL494CDR	Texas Instruments	Cut Tape (CT) & Digi-Reel®	7 ~ 40	1 ~ 300	45	0 ~ 70	No	ROHS3 Compliant	Active
TL494ID	Texas Instruments	Tube	7 ~ 40	1 ~ 300	45	-40 ~ 85	No	ROHS3 Compliant	Active
TL494IDR	Texas Instruments	Cut Tape (CT) & Digi-Reel®	7 ~ 40	1 ~ 300	45	-40 ~ 85	No	ROHS3 Compliant	Active
TL594CD	onsemi	Plastic Dip	7 ~ 40	300	96	-40 ~ 85	Yes	RoHS non-compliant	Obsolete
TL494CD	onsemi	Plastic Dip	7 ~ 40	200	48	0 ~ 70	Yes	RoHS non-compliant	Obsolete

Engineering Selection Recommendations

Primary Substitutes (Active, Full Compliance):

TL594IDR and TL594ID from Texas Instruments are the most direct functional equivalents. Both maintain the 7V ~ 40V supply voltage range, support the required topologies, and carry ROHS3 compliance certification. TL594IDR in Cut Tape & Digi-Reel® packaging matches the tape and reel format of the original part. TL594ID in Tube packaging provides an alternative for applications where tube format is acceptable. Both support the full -40°C ~ 85°C operating temperature range.

Secondary Substitutes (Active, Broader Topology Support):

TL494CDR, TL494ID, and TL494IDR from Texas Instruments are functionally compatible controllers with broader topology support (buck, boost, flyback, forward converter, full-bridge, half-bridge, push-pull). These parts maintain the 7V ~ 40V supply voltage specification and ROHS3 compliance. The primary design consideration is the reduced maximum duty cycle (45% versus 96%), which may limit application in certain buck converter configurations requiring higher duty cycles. TL494IDR and TL494ID support the full -40°C ~ 85°C temperature range, while TL494CDR operates within 0°C ~ 70°C.

Obsolete Parts (Not Recommended for New Designs):

TL594CD and TL494CD from onsemi are obsolete and carry RoHS non-compliance status. These parts should not be selected for new production designs or long-term supply planning.

Frequently Asked Questions (FAQ)

Q: Can TL594IDR replace TL594CDR2G directly?

A: Yes. Both parts share the 16-SOIC package, 7V ~ 40V supply voltage range, and support buck and push-pull topologies. TL594IDR is manufactured by Texas Instruments and carries ROHS3 compliance. The primary difference is packaging format (Cut Tape & Digi-Reel® versus Tape & Reel), which does not affect electrical compatibility on the PCB.

Q: What is the impact of using TL494CDR instead of TL594CDR2G?

A: TL494CDR supports a broader range of topologies but has a maximum duty cycle of 45% compared to the TL594CDR2G specification of 96%. Applications requiring duty cycles above 45% cannot use TL494CDR. Additionally, TL494CDR operates within 0°C ~ 70°C, which excludes operation below 0°C or above 70°C. Verify application requirements before substitution.

Q: Are obsolete parts acceptable for replacement?

A: No. TL594CD and TL494CD are obsolete and RoHS non-compliant. These parts should not be used in new designs or production environments requiring regulatory compliance. Active alternatives with current product status and full compliance certification are available.

Q: Does the absence of synchronous rectifier support in TL494 variants affect substitution?

A: The TL594CDR2G includes synchronous rectifier support, while TL494 variants do not. This difference does not prevent electrical substitution at the controller IC level. However, designs that rely on synchronous rectifier functionality must retain the TL594 family or verify that external rectification meets performance requirements.

Q: What packaging formats are available for TL594 controllers?

A: TL594CDR2G is supplied in Tape & Reel (TR) format. Equivalent parts are available in Cut Tape & Digi-Reel® (TL594IDR) and Tube (TL594ID) formats. Packaging selection depends on manufacturing process requirements and component handling systems. All three formats use the same 16-SOIC footprint.

Q: Is temperature range a limiting factor for substitution?

A: Yes, for applications operating outside 0°C ~ 70°C. TL594CDR2G and TL594ID/TL594IDR support -40°C ~ 85°C operation. TL494CDR and TL494CD are limited to 0°C ~ 70°C. Verify application thermal requirements before selecting a substitute with a narrower temperature range.

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