LM1117MP-1.8 Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LM1117MP-1.8 is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 1.8V output at up to 800mA. This device operates as a positive fixed output regulator in a surface-mount SOT-223 package. The main part number is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. Substitute parts maintain the core electrical specifications while offering improved availability and compliance status.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	800mA
Input Voltage (Max)	15V
Voltage Dropout (Max)	1.2V @ 800mA
Quiescent Current (Iq)	5 mA
PSRR	75dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	0°C ~ 125°C
Package	SOT-223 (TO-261-4, TO-261AA)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitute parts for the LM1117MP-1.8 are classified based on electrical compatibility and product status. The primary substitution criteria are:

Fixed output voltage of 1.8V
Output current capability of 800mA or greater
Maximum input voltage of 15V
SOT-223 package compatibility
Over current and over temperature protection

Parts are grouped into three categories:

Direct Manufacturer Substitutes (Texas Instruments): Parts with identical electrical specifications and active product status, differing only in packaging configuration or RoHS compliance.

Manufacturer Recommended Substitutes: Parts with enhanced specifications (higher output current or extended temperature range) that maintain full backward compatibility while offering improved performance margins.

Parametric Equivalents: Parts with matching electrical performance from the same or alternative manufacturers, suitable for direct replacement in circuit designs.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Voltage Dropout (Max)	Quiescent Current	PSRR	Operating Temp	Product Status	RoHS Status
LM1117MP-1.8	Texas Instruments	1.8V	800mA	1.2V @ 800mA	5 mA	75dB (120Hz)	0°C ~ 125°C	Obsolete	Non-compliant
LM1117MP-1.8/NOPB	Texas Instruments	1.8V	800mA	1.2V @ 800mA	5 mA	75dB (120Hz)	0°C ~ 125°C	Active	ROHS3 Compliant
LM1117MPX-1.8/NOPB	Texas Instruments	1.8V	800mA	1.2V @ 800mA	5 mA	75dB (120Hz)	0°C ~ 125°C	Active	ROHS3 Compliant
TLV1117-18IDCYR	Texas Instruments	1.8V	800mA	1.3V @ 800mA	10 mA	75dB (120Hz)	-40°C ~ 125°C	Active	ROHS3 Compliant
TLV1117-18IDCYRG3	Texas Instruments	1.8V	800mA	1.3V @ 800mA	10 mA	75dB (120Hz)	-40°C ~ 125°C	Active	ROHS3 Compliant
TLV1117-18CDCYR	Texas Instruments	1.8V	800mA	1.3V @ 800mA	10 mA	75dB (120Hz)	0°C ~ 125°C	Active	ROHS3 Compliant
TLV1117-18CDCYRG3	Texas Instruments	1.8V	800mA	1.3V @ 800mA	10 mA	75dB (120Hz)	0°C ~ 125°C	Active	ROHS3 Compliant
REG1117A-1.8/2K5	Texas Instruments	1.8V	1A	1.55V @ 1A	10 mA	62dB (120Hz)	-40°C ~ 125°C	Last Time Buy	ROHS3 Compliant
AZ1117H-1.8TRE1	Diodes Incorporated	1.8V	1A	1.25V @ 1A	10 mA	75dB (120Hz)	-40°C ~ 125°C	Active	ROHS3 Compliant
AZ1117H-1.8TRG1	Diodes Incorporated	1.8V	1A	1.25V @ 1A	10 mA	75dB (120Hz)	-40°C ~ 125°C	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement with Active Status: LM1117MP-1.8/NOPB and LM1117MPX-1.8/NOPB are the primary choices. Both maintain identical electrical specifications to the obsolete LM1117MP-1.8 while offering active product status and ROHS3 compliance. These parts are suitable for designs requiring no circuit modification.

For Extended Temperature Range Applications: TLV1117-18IDCYR and TLV1117-18IDCYRG3 extend the operating temperature range to -40°C ~ 125°C while maintaining 800mA output current and 75dB PSRR. These are appropriate for industrial or automotive environments requiring wider temperature operation.

For Higher Output Current Capability: REG1117A-1.8/2K5 and AZ1117H-1.8TRE1 / AZ1117H-1.8TRG1 provide 1A output current, offering improved current headroom. The Diodes Incorporated AZ1117H series offers superior dropout voltage performance (1.25V @ 1A) compared to the REG1117A variant (1.55V @ 1A).

For Temperature-Matched Designs: TLV1117-18CDCYR and TLV1117-18CDCYRG3 maintain the original 0°C ~ 125°C operating range while providing active product status and ROHS3 compliance.

All recommended substitutes maintain SOT-223 package compatibility and include over current and over temperature protection.

Frequently Asked Questions (FAQ)

Q: Can LM1117MP-1.8/NOPB be used as a direct replacement for LM1117MP-1.8?

A: Yes. Both parts deliver identical electrical performance: 1.8V fixed output, 800mA maximum current, 1.2V dropout voltage at 800mA, and 75dB PSRR. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant). The /NOPB variant is the recommended active equivalent.

Q: What is the difference between TLV1117-18IDCYR and TLV1117-18CDCYR?

A: Both deliver 1.8V output at 800mA with 75dB PSRR. The primary difference is operating temperature range: TLV1117-18IDCYR operates from -40°C to 125°C, while TLV1117-18CDCYR operates from 0°C to 125°C. Select based on your application's minimum operating temperature requirement.

Q: Can I use AZ1117H-1.8TRE1 in place of LM1117MP-1.8?

A: Yes, with design considerations. The AZ1117H-1.8TRE1 provides higher output current (1A vs. 800mA) and superior dropout voltage performance (1.25V @ 1A). It operates across -40°C to 125°C and is ROHS3 compliant. The SOT-223 package is mechanically compatible. This substitution provides improved performance margins.

Q: Why would I choose REG1117A-1.8/2K5 over LM1117MP-1.8/NOPB?

A: REG1117A-1.8/2K5 offers 1A output current versus 800mA, providing 25% additional current capacity. It also extends the operating temperature range to -40°C ~ 125°C. However, it carries Last Time Buy status. Choose this part only if your design requires the higher current capability and extended temperature range.

Q: Are all substitute parts in SOT-223 package?

A: Yes. All listed substitute parts use SOT-223 packaging (TO-261-4 or TO-261AA case designations), ensuring mechanical and pin compatibility with the original LM1117MP-1.8.

Q: What does PSRR 75dB (120Hz) mean for substitution?

A: PSRR (Power Supply Rejection Ratio) measures how effectively the regulator rejects input voltage ripple. A higher PSRR value indicates better noise rejection. The LM1117MP-1.8 and most substitutes deliver 75dB at 120Hz, except REG1117A-1.8/2K5 which delivers 62dB. For noise-sensitive applications, maintain 75dB PSRR by selecting LM1117MP-1.8/NOPB, TLV1117 variants, or AZ1117H series.

Q: What is the significance of RoHS compliance in selecting a substitute?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances standards, eliminating lead and other restricted materials. The original LM1117MP-1.8 is non-compliant. All active substitutes listed are ROHS3 compliant, making them suitable for applications with environmental or regulatory requirements.

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