LM1117IMPX-5.0 Linear Voltage Regulator — Equivalent & Substitute Parts

Part Overview

The LM1117IMPX-5.0 is a linear voltage regulator IC from Texas Instruments, classified as a positive fixed output 5V regulator with 800mA output capacity in SOT-223-4 surface mount packaging. This part is currently listed as obsolete. Due to its obsolete status, equivalent substitute parts with active product status are necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across output voltage, current capacity, dropout voltage, and thermal performance specifications, while meeting modern RoHS compliance standards.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM1117IMPX-5.0
Product Category	Power Management (PMIC)
Output Voltage (Fixed)	5V
Output Current	800mA
Input Voltage (Max)	15V
Dropout Voltage (Max)	1.2V @ 800mA
Quiescent Current (Iq)	5 mA
PSRR	75dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature Range	-40°C ~ 125°C
Package / Case	TO-261-4, TO-261AA (SOT-223-4)
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitute parts for the LM1117IMPX-5.0 are grouped into two categories based on electrical and mechanical compatibility:

Parametric Equivalents (Texas Instruments LM1117 and TLV1117 Series): These parts maintain identical or near-identical electrical specifications including 5V fixed output, 800mA output current, 15V maximum input voltage, 1.2V–1.3V dropout voltage, 75dB PSRR, and SOT-223-4 packaging. All are active products with RoHS3 compliance. Differences are limited to quiescent current (5–10 mA) and moisture sensitivity levels.

Manufacturer Recommended Alternatives (Diodes Incorporated AZ1117 Series, STMicroelectronics LD1117S50TR, Analog Devices LT1117CST-5#PBF): These parts provide functional equivalence with 5V output and SOT-223 packaging but may differ in output current capacity (800mA–1A), dropout voltage (1.2V–1.3V), quiescent current (6–10 mA), and protection features. All are active products with RoHS3 compliance.

Critical Parameters for Substitution:

Output voltage: 5V (fixed)
Output current: 800mA minimum
Input voltage range: up to 15V
Dropout voltage: ≤1.3V @ rated current
Package: SOT-223 or SOT-223-4 (TO-261-4, TO-261AA)
Operating temperature: -40°C ~ 125°C
RoHS compliance: ROHS3 required for new designs

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Iq (mA)	PSRR (dB)	Package	Product Status	RoHS Status
LM1117IMPX-5.0	Texas Instruments	5V	800mA	15V	1.2V @ 800mA	5	75 (120Hz)	SOT-223-4	Obsolete	RoHS non-compliant
LM1117IMP-5.0/NOPB	Texas Instruments	5V	800mA	15V	1.2V @ 800mA	5	75 (120Hz)	SOT-223	Active	ROHS3 Compliant
LM1117IMPX-5.0/NOPB	Texas Instruments	5V	800mA	15V	1.2V @ 800mA	5	75 (120Hz)	SOT-223-4	Active	ROHS3 Compliant
REG1117-5/2K5	Texas Instruments	5V	800mA	15V	1.2V @ 800mA	10	62 (120Hz)	SOT-223-4	Active	ROHS3 Compliant
TLV1117-50IDCYR	Texas Instruments	5V	800mA	15V	1.3V @ 800mA	—	75 (120Hz)	SOT-223-4	Active	ROHS3 Compliant
TLV1117-50IDCYRG3	Texas Instruments	5V	800mA	15V	1.3V @ 800mA	—	75 (120Hz)	SOT-223-4	Active	ROHS3 Compliant
AZ1117H-5.0TRE1	Diodes Incorporated	5V	1A	15V	1.25V @ 1A	10	75 (120Hz)	SOT-223-3	Active	ROHS3 Compliant
AZ1117H-5.0TRG1	Diodes Incorporated	5V	1A	15V	1.25V @ 1A	10	75 (120Hz)	SOT-223-3	Active	ROHS3 Compliant
AZ1117IH-5.0TRG1	Diodes Incorporated	5V	1A	15V	1.3V @ 800mA	6	70 (120Hz)	SOT-223-3	Active	ROHS3 Compliant
LD1117S50TR	STMicroelectronics	5V	800mA	15V	1.2V @ 800mA	10	75 (120Hz)	SOT-223	Active	ROHS3 Compliant
LT1117CST-5#PBF	Analog Devices Inc.	5V	800mA	15V	1.2V @ 800mA	10	75 (120Hz)	SOT-223-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation — Direct Replacement (Highest Compatibility): LM1117IMPX-5.0/NOPB (Texas Instruments) is the direct active equivalent. It maintains identical electrical specifications, SOT-223-4 packaging, and achieves ROHS3 compliance. This part is recommended for designs requiring no layout or schematic modifications.

Secondary Recommendation — Texas Instruments Alternatives: LM1117IMP-5.0/NOPB and TLV1117-50IDCYR/TLV1117-50IDCYRG3 are functionally equivalent with 5V output and 800mA capacity. The TLV1117 series offers slightly higher dropout voltage (1.3V vs. 1.2V) but maintains 75dB PSRR. REG1117-5/2K5 is compatible but exhibits reduced PSRR (62dB) and higher quiescent current (10mA).

Alternative Manufacturers — Functional Equivalents: Diodes Incorporated AZ1117 series (AZ1117H-5.0TRE1, AZ1117H-5.0TRG1, AZ1117IH-5.0TRG1) provide 5V output with increased current capacity (1A) and SOT-223-3 packaging. These are suitable for applications requiring higher current headroom. STMicroelectronics LD1117S50TR and Analog Devices LT1117CST-5#PBF maintain 800mA output with identical dropout voltage and PSRR specifications.

Compliance Consideration: All recommended substitutes are ROHS3 compliant, addressing the non-compliance status of the obsolete LM1117IMPX-5.0. Selection should prioritize active product status and RoHS3 certification for regulatory compliance in new designs.

Frequently Asked Questions (FAQ)

Q: Can LM1117IMP-5.0/NOPB replace LM1117IMPX-5.0 directly? A: Yes. Both parts share identical electrical specifications (5V output, 800mA, 1.2V dropout, 75dB PSRR, -40°C ~ 125°C operating range). The primary difference is packaging designation (SOT-223 vs. SOT-223-4) and product status (Active vs. Obsolete). Electrical performance is equivalent.

Q: What is the difference between SOT-223 and SOT-223-4 packaging? A: SOT-223-4 includes four pins (GND, IN, OUT, GND), while SOT-223-3 includes three pins (GND, IN, OUT). Both fit the same footprint (TO-261-4, TO-261AA). Verify PCB layout compatibility before substitution.

Q: Can I use AZ1117H-5.0TRG1 (1A output) instead of LM1117IMPX-5.0 (800mA)? A: Yes. The AZ1117H-5.0TRG1 provides higher current capacity (1A vs. 800mA) with compatible 5V output, 15V input maximum, and similar dropout voltage (1.25V). It is a suitable upgrade for applications requiring additional current margin. Package is SOT-223-3 (three-pin variant).

Q: Are all substitute parts RoHS3 compliant? A: Yes. All recommended substitute parts carry ROHS3 Compliant certification. The original LM1117IMPX-5.0 is RoHS non-compliant; substitution addresses this regulatory requirement.

Q: What is the impact of higher quiescent current in REG1117-5/2K5 (10mA vs. 5mA)? A: Higher quiescent current increases standby power consumption. For battery-powered or low-power applications, this may be significant. REG1117-5/2K5 also exhibits reduced PSRR (62dB vs. 75dB), affecting noise performance. Use only if application requirements permit these trade-offs.

Q: Can I substitute LT1117CST-5#PBF (Analog Devices) for the Texas Instruments part? A: Yes. LT1117CST-5#PBF maintains 5V output, 800mA capacity, 1.2V dropout voltage, and 75dB PSRR. It is packaged in SOT-223-3 (three-pin) and supplied in Tube packaging. Verify PCB footprint compatibility (three-pin vs. four-pin layout).

Q: What is the operating temperature difference between LD1117S50TR and LM1117IMPX-5.0? A: LD1117S50TR operates from 0°C ~ 125°C, while LM1117IMPX-5.0 operates from -40°C ~ 125°C. For applications requiring full -40°C operation, LD1117S50TR is not suitable. Use Texas Instruments or Diodes Incorporated alternatives for extended low-temperature range.

Q: How do I choose between TLV1117 and LM1117 series? A: Both are Texas Instruments products with 5V output and 800mA capacity. TLV1117 exhibits slightly higher dropout voltage (1.3V vs. 1.2V) but identical PSRR (75dB). Choose LM1117 for applications with tighter voltage margin; TLV1117 for general-purpose applications. Both are active products with ROHS3 compliance.

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