IRU1117-33CDTR Equivalent & Substitute Parts

Part Overview

The IRU1117-33CDTR is a linear voltage regulator IC from Infineon Technologies designed to deliver a fixed 3.3V output at 800mA in a TO-252-3 (DPAK) surface mount package. This part is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The IRU1117-33CDTR serves as a positive fixed output regulator with integrated over-current and over-temperature protection, suitable for applications requiring stable 3.3V power delivery from input sources up to 7V.

Key Parameters

Parameter	IRU1117-33CDTR
Output Voltage (Fixed)	3.3V
Output Current	800mA
Input Voltage (Max)	7V
Dropout Voltage (Max)	1.3V @ 1A
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Operating Temperature	0°C ~ 125°C
Protection Features	Over Current, Over Temperature
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution of the IRU1117-33CDTR is determined by the following critical parameters: fixed 3.3V output voltage, 800mA output current capability, TO-252-3 package compatibility, and identical protection features (over-current and over-temperature). All substitute parts listed maintain these core electrical and mechanical specifications. The substitute parts are grouped based on manufacturer and product status, with all active alternatives offering improved input voltage tolerance (15V maximum versus 7V) and enhanced PSRR performance (75dB versus 70dB at 120Hz). Dropout voltage specifications across substitutes remain functionally equivalent at 1.2V @ 800mA.

Parameter Comparison

Parameter	IRU1117-33CDTR (Infineon)	LD1117DT33TR (STMicroelectronics)	LM1117DT-3.3/NOPB (TI)	LM1117DTX-3.3/NOPB (TI)	LM1117IDT-3.3/NOPB (TI)	LM1117IDTX-3.3/NOPB (TI)
Output Voltage	3.3V	3.3V	3.3V	3.3V	3.3V	3.3V
Output Current	800mA	800mA	800mA	800mA	800mA	800mA
Input Voltage (Max)	7V	15V	15V	15V	15V	15V
Dropout Voltage (Max)	1.3V @ 1A	1.2V @ 800mA	1.2V @ 800mA	1.2V @ 800mA	1.2V @ 800mA	1.2V @ 800mA
PSRR	70dB (120Hz)	75dB (120Hz)	75dB (120Hz)	75dB (120Hz)	75dB (120Hz)	75dB (120Hz)
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK	TO-252-3, DPAK
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance, addressing the obsolete status and non-compliance limitations of the IRU1117-33CDTR. The LD1117DT33TR from STMicroelectronics provides direct functional equivalence with improved input voltage tolerance and enhanced PSRR performance. Texas Instruments LM1117 series variants (LM1117DT-3.3/NOPB, LM1117DTX-3.3/NOPB, LM1117IDT-3.3/NOPB, LM1117IDTX-3.3/NOPB) offer extended temperature range options (-40°C ~ 125°C for IDT variants) and multiple packaging formats (Tube and Cut Tape & Digi-Reel). Selection between these alternatives should be based on packaging requirements, temperature range specifications, and supply chain availability. All substitutes maintain identical electrical performance for the core 3.3V 800mA regulation function and are pin-compatible within the TO-252-3 package footprint.

Frequently Asked Questions (FAQ)

Q: Can the LD1117DT33TR directly replace the IRU1117-33CDTR? A: Yes. The LD1117DT33TR maintains identical output voltage (3.3V), output current (800mA), and TO-252-3 package configuration. The higher input voltage rating (15V versus 7V) and improved PSRR (75dB versus 70dB) provide enhanced performance margins without affecting pin compatibility or functional operation.

Q: What is the difference between LM1117DT-3.3/NOPB and LM1117DTX-3.3/NOPB? A: Both parts are electrically identical with 3.3V output and 800mA current capability. The primary difference is packaging format: LM1117DT-3.3/NOPB is supplied in Tube, while LM1117DTX-3.3/NOPB is supplied in Cut Tape & Digi-Reel format. Selection depends on assembly process requirements and supply chain preferences.

Q: Why do some LM1117 variants specify -40°C ~ 125°C operating temperature? A: The LM1117IDT-3.3/NOPB and LM1117IDTX-3.3/NOPB variants feature extended lower temperature operation to -40°C, compared to 0°C for other LM1117 variants. This extended range is suitable for applications requiring operation in cold environments. The IRU1117-33CDTR and other substitutes operate from 0°C minimum.

Q: Are all substitute parts RoHS compliant? A: Yes. All listed substitute parts carry ROHS3 compliance certification, addressing the RoHS non-compliance status of the obsolete IRU1117-33CDTR. This compliance is mandatory for new designs in regulated markets.

Q: What is the significance of the improved dropout voltage in substitute parts? A: Substitute parts specify 1.2V dropout at 800mA, compared to 1.3V @ 1A for the IRU1117-33CDTR. This represents improved efficiency and reduced heat dissipation, particularly beneficial in applications with limited input voltage headroom or thermal constraints.

Q: Can I use these substitutes interchangeably in existing designs? A: Yes, within the constraints of your specific application. All substitutes share identical pin configuration, package footprint, and core electrical specifications (3.3V output, 800mA current, TO-252-3 package). Verify that your application's input voltage range (up to 15V for substitutes versus 7V for the original) and operating temperature requirements are met by your selected substitute.

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