TL598CD Equivalent & Substitute Parts

Part Overview

The TL598CD is a Power Management IC (PMIC) manufactured by Texas Instruments, functioning as a multi-topology DC-DC controller supporting Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, and Push-Pull topologies. This device provides positive output step-up, step-down, and step-up/step-down regulation through a transistor driver output configuration. The TL598CD is currently in Last Time Buy status with 3,300 units available in inventory. Due to its discontinued product status, identifying functionally equivalent alternatives is essential for design continuity and long-term supply chain planning.

Substiute Parts

TL598CD

Texas InstrumentsIn Stock: 3381TL598CD Datasheet

Current PartRFQ

TL594CDR

Texas InstrumentsIn Stock: 25131TL594CDR Datasheet

MFR RecommendedRFQ

AZ494CMTR-E1

Diodes IncorporatedIn Stock: 4557AZ494CMTR-E1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TL598CD are evaluated based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

• Package compatibility: 16-SOIC form factor (0.154", 3.90mm Width)
• Supply voltage range: 7V ~ 40V input capability
• Output configuration: Positive output
• Control features: Dead Time Control and Frequency Control
• Mounting type: Surface Mount
• Regulatory compliance: ROHS3 Compliant, MSL 1

Substitution Logic: The TL594CDR qualifies as a direct functional equivalent, maintaining identical package, supply voltage range, output configuration, and control features. While the TL594CDR offers extended switching frequency capability (1kHz ~ 300kHz versus 100kHz fixed) and higher maximum duty cycle (97% versus 45%), these represent enhanced specifications that do not preclude substitution in applications designed for the TL598CD.

The AZ494CMTR-E1 represents a topology-limited alternative, supporting only Buck (step-down) conversion with fixed 5V output. This part is suitable only for applications requiring step-down regulation at 5V output with 200mA current capability and does not support the multi-topology functionality of the TL598CD.

Parameter Comparison

Engineering Selection Recommendations

TL594CDR (Primary Substitute): The TL594CDR is the recommended substitute for the TL598CD. Both devices are manufactured by Texas Instruments and share identical package geometry, supply voltage specifications, output configuration, and control feature set. The TL594CDR maintains Active product status with 25,100 units in inventory, ensuring long-term availability. Both parts are ROHS3 Compliant with MSL 1 rating. The TL594CDR's extended switching frequency range and higher duty cycle capability provide design flexibility without compromising compatibility with existing TL598CD circuit implementations.

AZ494CMTR-E1 (Limited Scope Substitute): The AZ494CMTR-E1 is suitable only for applications requiring Buck topology with fixed 5V output regulation. This part is not a general substitute for the TL598CD due to its topology limitation and fixed output configuration. Selection of the AZ494CMTR-E1 is appropriate only when the application design specifically requires step-down regulation at 5V with 200mA output current. The AZ494CMTR-E1 offers extended operating temperature range (-40°C ~ 85°C) compared to the TL598CD (0°C ~ 70°C), which may be advantageous for certain environmental applications.

Frequently Asked Questions (FAQ)

Q: Can the TL594CDR directly replace the TL598CD in existing designs? A: Yes. The TL594CDR maintains identical package form factor (16-SOIC), supply voltage range (7V ~ 40V), output configuration (positive), and control features (dead time control, frequency control). Both devices support multi-topology operation. The TL594CDR's enhanced specifications (wider frequency range and higher duty cycle) do not prevent substitution in applications designed for the TL598CD.

Q: What is the primary difference between the TL598CD and TL594CDR? A: The TL598CD operates at a fixed 100kHz switching frequency with 45% maximum duty cycle, while the TL594CDR provides programmable switching frequency (1kHz ~ 300kHz) with 97% maximum duty cycle. Both support identical topologies and output configurations.

Q: Is the AZ494CMTR-E1 a suitable replacement for the TL598CD? A: The AZ494CMTR-E1 is not a general substitute. It supports only Buck topology with fixed 5V output, whereas the TL598CD supports multiple topologies with programmable output. Use the AZ494CMTR-E1 only if your application requires step-down regulation specifically at 5V output with 200mA current capability.

Q: Are all substitute parts available in the same packaging options? A: All three parts are available in 16-SOIC surface mount package. The TL598CD is supplied in Tube packaging, the TL594CDR in Cut Tape and Digi-Reel packaging, and the AZ494CMTR-E1 in standard packaging. Verify packaging availability with your supplier for production requirements.

Q: Do all substitute parts meet the same compliance standards? A: Yes. The TL598CD, TL594CDR, and AZ494CMTR-E1 are all ROHS3 Compliant with MSL 1 (Unlimited) rating and REACH Unaffected status. All parts carry EAR99 ECCN classification.

Q: What is the operating temperature range difference between substitutes? A: The TL598CD and TL594CDR operate from 0°C ~ 70°C (TA), while the AZ494CMTR-E1 operates from -40°C ~ 85°C (TA). The AZ494CMTR-E1 provides extended low-temperature capability, which may be required for certain industrial or automotive applications.