TPS79433DCQ Equivalent & Substitute Parts

Part Overview

The TPS79433DCQ is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output applications with 250mA current capacity in a SOT-223-6 surface mount package. This device is classified as Last Time Buy, indicating end-of-life status. The TPS79433DCQ provides essential power management functionality with integrated protection features including over-current, over-temperature, reverse polarity, and under-voltage lockout protection.

Due to Last Time Buy status, identifying functionally compatible substitute parts is necessary for design continuity and long-term supply chain planning. The TPS79633DCQR serves as the manufacturer-recommended equivalent, offering enhanced specifications while maintaining package and output voltage compatibility.

Substiute Parts

TPS79433DCQ

Texas InstrumentsIn Stock: 2202TPS79433DCQ Datasheet

Current PartRFQ

TPS79633DCQR

Texas InstrumentsIn Stock: 20248TPS79633DCQR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TPS79433DCQ is determined by the following critical parameters:

Package Compatibility: Both the main part and substitute must use SOT-223-6 surface mount packaging to ensure direct PCB footprint compatibility without layout modifications.

Output Voltage: Fixed 3.3V output is mandatory for circuit voltage rail compatibility.

Input Voltage Range: Maximum input voltage of 5.5V ensures safe operation within the same power supply architecture.

Protection Features: Identical protection mechanisms (Over Current, Over Temperature, Reverse Polarity, UVLO) guarantee equivalent safety and reliability characteristics.

Operating Temperature Range: -40°C ~ 125°C operational window must be maintained for environmental specification compliance.

Regulatory Compliance: ROHS3 compliance and MSL rating of 2 (1 Year) ensure equivalent environmental and handling requirements.

The TPS79633DCQR qualifies as a direct substitute based on these parameters. While the substitute offers higher current output (1A vs 250mA) and improved quiescent current specifications, these represent enhanced capabilities rather than deviations from the core substitution criteria.

Parameter Comparison

Engineering Selection Recommendations

The TPS79633DCQR is the manufacturer-recommended substitute for the TPS79433DCQ. Both devices maintain identical package, output voltage, input voltage range, operating temperature, and protection feature specifications. The TPS79633DCQR carries Active product status, ensuring continued availability and manufacturing support, whereas the TPS79433DCQ is Last Time Buy.

From a compliance perspective, both parts are ROHS3 compliant with equivalent MSL ratings of 2 (1 Year), satisfying identical environmental and handling requirements.

The primary technical difference is output current capacity: the TPS79633DCQR provides 1A output versus 250mA for the TPS79433DCQ. This enhanced capability is backward compatible with applications designed for the lower current specification. The substitute's higher quiescent current (385 µA vs 220 µA) and slightly higher dropout voltage at rated current represent trade-offs inherent to the higher current design.

Selection of the TPS79633DCQR is appropriate for new designs and production transitions from the Last Time Buy TPS79433DCQ.

Frequently Asked Questions (FAQ)

Q: Can the TPS79633DCQR directly replace the TPS79433DCQ on existing PCBs?

A: Yes. Both devices use identical SOT-223-6 packaging, enabling direct PCB footprint compatibility without layout modifications. No board redesign is required.

Q: Are the output voltages identical?

A: Yes. Both regulators provide fixed 3.3V output, ensuring voltage rail compatibility in existing circuits.

Q: What is the significance of the higher current rating on the TPS79633DCQR?

A: The TPS79633DCQR supports 1A output compared to 250mA on the TPS79433DCQ. This enhanced capability is backward compatible with designs requiring lower current. Applications drawing less than 250mA will operate identically on either device.

Q: Do both parts meet the same regulatory requirements?

A: Yes. Both the TPS79433DCQ and TPS79633DCQR are ROHS3 compliant with MSL rating 2 (1 Year), satisfying identical environmental and handling specifications.

Q: Why is the TPS79433DCQ marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing this product line. The TPS79633DCQR represents the active replacement, ensuring long-term supply chain continuity.

Q: Are the protection features equivalent?

A: Yes. Both devices include identical protection mechanisms: Over Current, Over Temperature, Reverse Polarity, and Under Voltage Lockout (UVLO).

Q: What is the operating temperature range for both parts?

A: Both the TPS79433DCQ and TPS79633DCQR operate across -40°C to 125°C, maintaining identical thermal specifications.