REG1117-5 Equivalent & Substitute Parts

Part Overview

The REG1117-5 is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 5V output at 800mA in a surface-mount SOT-223-4 package. This device is classified as Last Time Buy, indicating end-of-life status. Finding equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term production requirements. The REG1117-5 serves as a positive fixed output regulator suitable for low-noise applications requiring thermal and overcurrent protection.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	800mA
Input Voltage (Max)	15V
Dropout Voltage (Max)	1.2V @ 800mA
Quiescent Current	10 mA
PSRR	62dB (120Hz)
Operating Temperature Range	-40°C ~ 125°C
Package	SOT-223-4
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the REG1117-5 are classified based on strict electrical and mechanical compatibility. The primary substitution criteria are:

Fixed 5V output voltage
Surface-mount SOT-223 package family (TO-261-4 or TO-261AA case)
Output current capability of 800mA or greater
Maximum input voltage of 15V or higher
Operating temperature range of -40°C to 125°C or compatible subset
Over-current and over-temperature protection
ROHS3 compliance

Parts are grouped into three categories: MFR Recommended (direct pin-compatible replacements from Texas Instruments), Parametric Equivalents (functionally equivalent with minor parameter variations), and Direct Alternatives (equivalent parts from other manufacturers).

Parameter Comparison

Part Number	Manufacturer	Output Current	Dropout Voltage	Quiescent Current	PSRR (120Hz)	Operating Temp	Product Status	Inventory
REG1117-5	Texas Instruments	800mA	1.2V @ 800mA	10 mA	62dB	-40°C ~ 125°C	Last Time Buy	16,793 Pcs
TLV76150DCYR	Texas Instruments	1A	0.9V @ 1A	100 µA	60dB ~ 40dB (1kHz ~ 1MHz)	-40°C ~ 125°C	Active	5,100 Pcs
LM1117IMP-5.0/NOPB	Texas Instruments	800mA	1.2V @ 800mA	5 mA	75dB (120Hz)	-40°C ~ 125°C	Active	23,100 Pcs
LM1117IMPX-5.0/NOPB	Texas Instruments	800mA	1.2V @ 800mA	5 mA	75dB (120Hz)	-40°C ~ 125°C	Active	45,477 Pcs
LM1117MP-5.0/NOPB	Texas Instruments	800mA	1.2V @ 800mA	5 mA	75dB (120Hz)	0°C ~ 125°C	Active	15,750 Pcs
LM1117MPX-5.0/NOPB	Texas Instruments	800mA	1.2V @ 800mA	5 mA	75dB (120Hz)	0°C ~ 125°C	Active	19,200 Pcs
TLV1117-50IDCY	Texas Instruments	800mA	1.3V @ 800mA	Not specified	75dB (120Hz)	-40°C ~ 125°C	Active	1,110 Pcs
LD1117S50TR	STMicroelectronics	800mA	1.2V @ 800mA	10 mA	75dB (120Hz)	0°C ~ 125°C	Active	72,811 Pcs
AZ1117H-5.0TRE1	Diodes Incorporated	1A	1.25V @ 1A	10 mA	75dB (120Hz)	-40°C ~ 125°C	Active	165,400 Pcs
AZ1117H-5.0TRG1	Diodes Incorporated	1A	1.25V @ 1A	10 mA	75dB (120Hz)	-40°C ~ 125°C	Active	65,400 Pcs
LD1117S50CTR	STMicroelectronics	800mA	1.3V @ 800mA	10 mA	75dB (120Hz)	-40°C ~ 125°C	Active	27,600 Pcs

Engineering Selection Recommendations

MFR Recommended Substitutes (Texas Instruments):

LM1117IMP-5.0/NOPB, LM1117IMPX-5.0/NOPB, LM1117MP-5.0/NOPB, and LM1117MPX-5.0/NOPB are direct functional replacements from the same manufacturer. These parts maintain identical electrical specifications (800mA output, 1.2V dropout, 5V fixed output) and package compatibility. The LM1117 series offers improved PSRR (75dB vs. 62dB) and lower quiescent current (5mA vs. 10mA). All variants are ROHS3 compliant with unlimited moisture sensitivity rating. Selection between IMP and MP variants depends on operating temperature requirements: IMP variants support -40°C to 125°C, while MP variants are rated 0°C to 125°C. The IMPX and MPX suffixes indicate extended temperature screening.

Parametric Equivalent (Texas Instruments):

TLV1117-50IDCY is an active parametric equivalent offering identical output specifications with improved dropout voltage (1.3V vs. 1.2V). This part maintains full temperature range coverage (-40°C to 125°C) and ROHS3 compliance. Inventory availability is limited (1,110 units).

Direct Alternatives (STMicroelectronics):

LD1117S50TR and LD1117S50CTR from STMicroelectronics provide electrical equivalence with identical 800mA output and 5V fixed voltage. The LD1117S50TR operates 0°C to 125°C, while LD1117S50CTR covers -40°C to 125°C. Both feature 1.2V to 1.3V dropout voltage and 75dB PSRR. STMicroelectronics parts offer superior inventory availability (72,811 and 27,600 units respectively) and ROHS3 compliance.

Higher Current Alternatives (Diodes Incorporated):

AZ1117H-5.0TRE1 and AZ1117H-5.0TRG1 from Diodes Incorporated deliver 1A output current, exceeding the REG1117-5 specification. These parts maintain 5V fixed output, -40°C to 125°C operating range, and ROHS3 compliance. Dropout voltage is 1.25V at 1A. Thermal shutdown protection is specified instead of over-current protection. Exceptional inventory availability (165,400 and 65,400 units) supports high-volume applications.

Enhanced Performance Alternative (Texas Instruments):

TLV76150DCYR offers superior performance with 1A output current, 0.9V dropout voltage, and significantly reduced quiescent current (100µA). This part includes current limit control features and operates -40°C to 125°C. ROHS3 compliance is confirmed. This option is suitable for applications requiring lower power dissipation and higher output current capability.

Frequently Asked Questions (FAQ)

Q: Can I use LM1117IMP-5.0/NOPB as a direct replacement for REG1117-5?

A: Yes. Both parts deliver 5V fixed output at 800mA in SOT-223-4 package with identical dropout voltage (1.2V @ 800mA), maximum input voltage (15V), and operating temperature range (-40°C to 125°C). The LM1117IMP-5.0/NOPB offers improved PSRR (75dB vs. 62dB) and lower quiescent current (5mA vs. 10mA). Pin configuration and thermal characteristics are compatible.

Q: What is the difference between LM1117IMP and LM1117MP variants?

A: The primary difference is operating temperature range. LM1117IMP-5.0/NOPB is rated -40°C to 125°C, while LM1117MP-5.0/NOPB is rated 0°C to 125°C. Both deliver identical electrical performance (800mA, 1.2V dropout, 75dB PSRR). Select IMP for applications requiring full military temperature range; select MP for commercial temperature applications.

Q: Can I use AZ1117H-5.0TRE1 (1A output) instead of REG1117-5 (800mA output)?

A: Yes, with design considerations. The AZ1117H-5.0TRE1 provides higher output current capability (1A vs. 800mA) and maintains 5V fixed output with compatible SOT-223 package. Dropout voltage is slightly higher (1.25V @ 1A vs. 1.2V @ 800mA). This part is suitable for applications where additional current headroom is beneficial. Thermal management and PCB layout remain critical.

Q: What is the difference between LD1117S50TR and LD1117S50CTR?

A: Both parts are STMicroelectronics LD1117 variants with identical electrical specifications (800mA, 5V fixed, 1.2V to 1.3V dropout). The primary difference is operating temperature: LD1117S50TR is rated 0°C to 125°C, while LD1117S50CTR is rated -40°C to 125°C. Select the CTR variant for full military temperature range applications.

Q: Is TLV76150DCYR a suitable replacement if my application requires lower quiescent current?

A: Yes. The TLV76150DCYR features significantly reduced quiescent current (100µA vs. 10mA in REG1117-5), making it ideal for battery-powered or low-power applications. It delivers 1A output (exceeding 800mA requirement) with superior dropout voltage (0.9V @ 1A). Operating temperature range (-40°C to 125°C) and ROHS3 compliance match the original specification. This part is recommended for power-sensitive designs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance certification, matching the REG1117-5 environmental standard. All parts are also REACH unaffected and classified as EAR99 for export control purposes.

Q: What packaging options are available for these substitutes?

A: All substitute parts are available in SOT-223-4 or SOT-223-3 surface-mount packages (TO-261-4 or TO-261AA case designations). Packaging formats include Cut Tape (CT), Digi-Reel, Tape & Reel (TR), and Tube options depending on the specific part number and supplier. Verify packaging format with your distributor to match assembly requirements.

Q: Can I mix different substitute parts in the same production run?

A: Electrical compatibility is confirmed across all listed substitutes for the specified application parameters (5V output, 800mA minimum current, SOT-223 package). However, verify thermal characteristics, quiescent current, and dropout voltage against your specific circuit design. Consult device datasheets for detailed electrical and thermal specifications before implementing multiple part numbers in production.

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