IRU1117-33CD Equivalent & Substitute Parts

Part Overview

The IRU1117-33CD is a linear voltage regulator IC from Infineon Technologies designed to deliver a fixed 3.3V output at up to 800mA. This Surface Mount device in TO-252-3 (DPAK) packaging is classified as Obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

IRU1117-33CD

Infineon TechnologiesIn Stock: 10341IRU1117-33CD Datasheet

Current PartRFQ

LD1117DT33TR

STMicroelectronicsIn Stock: 57816LD1117DT33TR Datasheet

MFR RecommendedRFQ

LM1117DT-3.3/NOPB

Texas InstrumentsIn Stock: 2206LM1117DT-3.3/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the IRU1117-33CD is determined by the following critical parameters:

• Fixed output voltage of 3.3V
• Minimum output current capability of 800mA
• Identical package format: TO-252-3 (DPAK)
• Surface Mount configuration
• Over Current and Over Temperature protection
• Operating temperature range compatibility (0°C ~ 125°C)

The identified substitute parts meet these core electrical and mechanical requirements. Differences in maximum input voltage ratings and dropout voltage specifications do not preclude substitution when the application circuit operates within the substitute part's specified limits.

Parameter Comparison

Engineering Selection Recommendations

Both LD1117DT33TR and LM1117DT-3.3/NOPB are Active products suitable for replacing the obsolete IRU1117-33CD. The LD1117DT33TR (STMicroelectronics) offers ROHS3 compliance and improved electrical performance with lower dropout voltage (1.2V vs. 1.3V) and higher PSRR (75dB vs. 70dB). The LM1117DT-3.3/NOPB (Texas Instruments) similarly provides ROHS3 compliance with equivalent electrical performance and lower quiescent current (5mA vs. 10mA for the STMicroelectronics part).

Selection between these two substitutes should be based on supply chain availability, preferred supplier relationships, and specific application requirements regarding quiescent current consumption. Both parts are pin-compatible and functionally equivalent within the specified operating parameters.

Frequently Asked Questions (FAQ)

Q: Can LD1117DT33TR or LM1117DT-3.3/NOPB be used as direct replacements for IRU1117-33CD?

A: Yes. Both substitute parts are pin-compatible in the TO-252-3 (DPAK) package and deliver the same 3.3V fixed output at 800mA. No PCB layout modifications are required.

Q: What is the significance of the higher maximum input voltage (15V) on the substitute parts?

A: The substitute parts accept input voltages up to 15V, compared to 7V for the IRU1117-33CD. This provides greater design flexibility but does not affect substitution compatibility. Applications designed for the IRU1117-33CD will operate identically with the substitute parts.

Q: Are there compliance differences between the original and substitute parts?

A: Yes. The IRU1117-33CD is RoHS non-compliant, while both LD1117DT33TR and LM1117DT-3.3/NOPB are ROHS3 compliant. For new designs or applications requiring RoHS compliance, the substitute parts are preferred.

Q: How do dropout voltage differences affect circuit performance?

A: The substitute parts feature lower dropout voltage (1.2V @ 800mA) compared to the original (1.3V @ 1A). This results in improved efficiency and reduced heat dissipation, representing a performance advantage with no negative impact on compatibility.

Q: Which substitute part should be selected for low-power applications?

A: The LM1117DT-3.3/NOPB offers lower quiescent current (5mA) compared to the LD1117DT33TR (10mA), making it preferable for battery-powered or low-standby-current applications.