LM1117MPX-3.3 Equivalent & Substitute Parts

Part Overview

The LM1117MPX-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed positive 3.3V output at 800mA in SOT-223-4 surface mount packaging. This device is classified as Last Time Buy, indicating discontinued production. Alternative equivalent and substitute parts are necessary to maintain design continuity and ensure long-term component availability for new production runs and legacy system support.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM1117MPX-3.3
Output Voltage (Fixed)	3.3V
Output Current	800mA
Input Voltage (Max)	15V
Dropout Voltage (Max)	1.2V @ 800mA
Package Type	SOT-223-4
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution eligibility for the LM1117MPX-3.3 is determined by the following critical parameters:

Fixed 3.3V output voltage
Output current capability of 800mA or greater
Maximum input voltage of 15V or higher
SOT-223 or compatible package footprint
Surface mount technology
Over current and over temperature protection
Operating temperature range of 0°C to 125°C or wider
ROHS3 compliance

Substitute parts are grouped into two categories: parametric equivalents (identical electrical specifications and packaging) and manufacturer-recommended alternatives (functionally compatible with minor specification variations).

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Package	Product Status
LM1117MPX-3.3	Texas Instruments	3.3V	800mA	15V	1.2V @ 800mA	SOT-223-4	Last Time Buy
LM1117MP-3.3/NOPB	Texas Instruments	3.3V	800mA	15V	1.2V @ 800mA	SOT-223	Active
LM1117MPX-3.3/NOPB	Texas Instruments	3.3V	800mA	15V	1.2V @ 800mA	SOT-223-4	Active
TLV1117-33CDCYR	Texas Instruments	3.3V	800mA	15V	1.3V @ 800mA	SOT-223-4	Active
TLV1117-33CDCYRG3	Texas Instruments	3.3V	800mA	15V	1.3V @ 800mA	SOT-223-4	Active
AZ1117CH-3.3TRG1	Diodes Incorporated	3.3V	1A	15V	1.3V @ 800mA	SOT-223-3	Active
BA33BC0FP-E2	Rohm Semiconductor	3.3V	1A	16V	Not specified	TO-252	Active
NCP1117LPST33T3G	onsemi	3.3V	1A	18V	1.4V @ 1A	SOT-223	Active
NCP1117ST33T3G	onsemi	3.3V	1A	20V	1.2V @ 800mA	SOT-223	Active
LD1117S33TR	STMicroelectronics	3.3V	800mA	15V	1.2V @ 800mA	SOT-223	Active

Engineering Selection Recommendations

Tier 1 - Direct Parametric Equivalents (Recommended Primary Choices)

LM1117MPX-3.3/NOPB and LM1117MP-3.3/NOPB from Texas Instruments are active production parts with identical electrical specifications to the original LM1117MPX-3.3. Both maintain ROHS3 compliance and are sourced from the original manufacturer, ensuring design continuity with minimal risk. LM1117MPX-3.3/NOPB matches the original SOT-223-4 package exactly.

Tier 2 - Texas Instruments TLV1117 Series

TLV1117-33CDCYR and TLV1117-33CDCYRG3 are active Texas Instruments alternatives with identical output voltage and current ratings. These parts feature a marginally higher dropout voltage (1.3V vs 1.2V) and higher quiescent current (10mA vs 5mA), which may impact thermal performance in power-constrained applications. Both maintain ROHS3 compliance and SOT-223-4 packaging.

Tier 3 - Multi-Manufacturer Alternatives

AZ1117CH-3.3TRG1 (Diodes Incorporated), NCP1117LPST33T3G and NCP1117ST33T3G (onsemi), and LD1117S33TR (STMicroelectronics) are active production parts with 3.3V fixed output and enhanced current ratings (800mA to 1A). These parts are suitable for applications requiring higher output current headroom. All maintain ROHS3 compliance. Package variations (SOT-223-3 vs SOT-223) require PCB layout verification for mechanical compatibility.

Tier 4 - Adjustable Output Alternative

BA1117FP-E2 (Rohm Semiconductor) is an adjustable output regulator requiring external resistor network configuration to achieve 3.3V output. This part is suitable only for designs with existing adjustable regulator topology and is not recommended as a direct drop-in replacement without circuit modification.

Tier 5 - Enhanced Performance Alternative

BA33BC0FP-E2 (Rohm Semiconductor) offers 1A output current in TO-252 packaging with lower quiescent current (0.5mA). This part requires PCB layout redesign due to different package footprint and is suitable for applications prioritizing low standby power consumption.

Frequently Asked Questions (FAQ)

Q: Can LM1117MP-3.3/NOPB replace LM1117MPX-3.3 directly?

A: Yes. Both parts are Texas Instruments products with identical electrical specifications (3.3V output, 800mA current, 1.2V dropout). The primary difference is packaging designation (SOT-223 vs SOT-223-4). Verify PCB footprint compatibility before substitution.

Q: What is the difference between LM1117MPX-3.3 and TLV1117-33CDCYRG3?

A: Both deliver 3.3V at 800mA in SOT-223-4 packaging. The TLV1117 has slightly higher dropout voltage (1.3V vs 1.2V) and quiescent current (10mA vs 5mA). For applications with tight power budgets or high input-to-output voltage differentials, the original LM1117MPX-3.3 or LM1117MPX-3.3/NOPB is preferred.

Q: Are onsemi NCP1117 parts compatible with the original design?

A: NCP1117LPST33T3G and NCP1117ST33T3G are functionally compatible with enhanced specifications (1A output current, higher input voltage ratings). Both are SOT-223 packaged and ROHS3 compliant. Verify thermal performance in your application, as higher quiescent current may increase power dissipation.

Q: Can I use AZ1117CH-3.3TRG1 as a direct replacement?

A: AZ1117CH-3.3TRG1 is mechanically and electrically compatible for most applications. It offers 1A output current (vs 800mA) and is packaged in SOT-223-3. Confirm PCB footprint compatibility, as SOT-223-3 has three leads versus four in SOT-223-4.

Q: Why is BA1117FP-E2 listed as a substitute if it requires circuit modification?

A: BA1117FP-E2 is included as a manufacturer-recommended alternative for designs that can accommodate adjustable regulator topology. It is not suitable for direct drop-in replacement without external resistor network design and PCB layout changes.

Q: Which substitute offers the best thermal performance?

A: LD1117S33TR (STMicroelectronics) and NCP1117ST33T3G (onsemi) both maintain 1.2V dropout voltage at 800mA, matching the original part's thermal efficiency. For applications requiring maximum current headroom with minimal thermal rise, NCP1117ST33T3G supports 1A output at 1.2V dropout.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH Unaffected status, meeting current environmental and regulatory requirements.

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