TLV1117-18CDCYG3 Equivalent & Substitute Parts

Part Overview

The TLV1117-18CDCYG3 is a linear voltage regulator IC from Texas Instruments, classified as a Power Management (PMIC) device. It delivers a fixed positive 1.8V output at 800mA in a SOT-223-4 surface mount package. The device is currently marked as obsolete, which necessitates identification of active equivalent and substitute parts for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	TLV1117-18CDCYG3
Output Voltage (Fixed)	1.8V
Output Current	800mA
Input Voltage (Max)	15V
Voltage Dropout (Max)	1.3V @ 800mA
Quiescent Current	10 mA
PSRR	75dB (120Hz)
Package	SOT-223-4
Operating Temperature	0°C ~ 125°C
Protection Features	Over Current, Over Temperature
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the TLV1117-18CDCYG3 is determined by the following critical parameters:

Primary Substitution Criteria:

Fixed output voltage of 1.8V
Output current capability of 800mA or greater
Maximum input voltage of 15V or higher
SOT-223 package family (TO-261-4, TO-261AA)
Surface mount mounting type
Over Current and Over Temperature protection

Substitution Categories:

Category 1: Direct Parametric Equivalents (800mA Output) Parts with identical or superior electrical specifications and active product status. These provide direct replacement capability with no design modifications required.

Category 2: Enhanced Performance Substitutes (1A Output) Parts with increased output current capability (1A) while maintaining all other critical parameters. These offer improved headroom for current-limited applications and are suitable for designs where the original 800mA specification was marginal.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ Rated Current	Quiescent Current	Package	Operating Temp	Product Status
TLV1117-18CDCYG3	Texas Instruments	1.8V	800mA	15V	1.3V @ 800mA	10 mA	SOT-223-4	0°C ~ 125°C	Obsolete
LM1117MP-1.8/NOPB	Texas Instruments	1.8V	800mA	15V	1.2V @ 800mA	5 mA	SOT-223	0°C ~ 125°C	Active
LM1117MPX-1.8/NOPB	Texas Instruments	1.8V	800mA	15V	1.2V @ 800mA	5 mA	SOT-223	0°C ~ 125°C	Active
TLV1117-18CDCY	Texas Instruments	1.8V	800mA	15V	1.3V @ 800mA	10 mA	SOT-223-4	0°C ~ 125°C	Active
LD1117S18CTR	STMicroelectronics	1.8V	800mA	15V	1.3V @ 800mA	10 mA	SOT-223	-40°C ~ 125°C	Active
LD1117S18TR	STMicroelectronics	1.8V	800mA	15V	1.2V @ 800mA	10 mA	SOT-223	0°C ~ 125°C	Active
SPX1117M3-L-1-8/TR	MaxLinear, Inc.	1.8V	800mA	20V	1.3V @ 800mA	10 mA	SOT-223-3	-40°C ~ 125°C	Active
AZ1117H-1.8TRE1	Diodes Incorporated	1.8V	1A	15V	1.25V @ 1A	10 mA	SOT-223-3	-40°C ~ 125°C	Active
AZ1117H-1.8TRG1	Diodes Incorporated	1.8V	1A	15V	1.25V @ 1A	10 mA	SOT-223-3	-40°C ~ 125°C	Active
LD1117AS18TR	STMicroelectronics	1.8V	1A	15V	1.3V @ 1A	10 mA	SOT-223	0°C ~ 125°C	Active
NCP1117ST18T3G	onsemi	1.8V	1A	20V	1.2V @ 800mA	10 mA	SOT-223	0°C ~ 125°C	Active

Engineering Selection Recommendations

Primary Recommendation: TLV1117-18CDCY

The TLV1117-18CDCY is the direct parametric equivalent from Texas Instruments. It maintains identical electrical specifications to the obsolete TLV1117-18CDCYG3, with the only difference being packaging format (Tube versus the original). This part is currently active and ROHS3 compliant, making it the preferred choice for direct replacement in existing designs.

Secondary Recommendations: LM1117MP-1.8/NOPB and LM1117MPX-1.8/NOPB

Both LM1117 variants from Texas Instruments provide improved performance characteristics, including lower quiescent current (5 mA versus 10 mA) and reduced dropout voltage (1.2V versus 1.3V at 800mA). These parts are active, ROHS3 compliant, and offer superior thermal efficiency. High inventory availability supports procurement reliability.

Alternative Recommendations: STMicroelectronics LD1117 Series

The LD1117S18CTR and LD1117S18TR from STMicroelectronics are functionally equivalent 800mA regulators with extended operating temperature ranges (-40°C to 125°C). The LD1117S18TR offers improved dropout voltage (1.2V). These parts are active and ROHS3 compliant.

Enhanced Current Capacity Options: 1A Output Regulators

For applications requiring additional current margin, the AZ1117H-1.8TRE1, AZ1117H-1.8TRG1 (Diodes Incorporated), LD1117AS18TR (STMicroelectronics), and NCP1117ST18T3G (onsemi) provide 1A output capability. These are suitable for designs where the original 800mA specification represents a limiting factor. All are active and ROHS3 compliant.

Extended Input Voltage Option: SPX1117M3-L-1-8/TR

The SPX1117M3-L-1-8/TR from MaxLinear supports a maximum input voltage of 20V (versus 15V for the original), providing additional design flexibility for higher input voltage applications while maintaining 800mA output current.

Frequently Asked Questions (FAQ)

Q: Can I use the LM1117MP-1.8/NOPB as a direct replacement for the TLV1117-18CDCYG3?

A: Yes. Both parts deliver 1.8V at 800mA in SOT-223 packages with identical input voltage ratings and operating temperature ranges. The LM1117MP-1.8/NOPB offers improved performance with lower quiescent current and dropout voltage. Verify PCB layout compatibility with the specific package variant.

Q: What is the difference between the 800mA and 1A output regulators?

A: The 1A variants (AZ1117H, LD1117AS18TR, NCP1117ST18T3G) provide higher current capacity. Select 1A parts only if your application requires current headroom beyond 800mA. For designs operating at or below 800mA, the 800mA variants are appropriate.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended substitute parts listed are ROHS3 compliant. The SPX1117M3-L-1-8/TR is RoHS compliant. Verify compliance documentation for your specific procurement source.

Q: Does package format affect electrical performance?

A: No. Package format (Tube, Cut Tape, Tape & Reel) affects only handling, storage, and procurement logistics. Electrical performance is determined by the part number and manufacturer specifications. SOT-223 package variants (SOT-223, SOT-223-3, SOT-223-4) are mechanically and electrically compatible.

Q: Which substitute offers the lowest dropout voltage?

A: The LM1117MP-1.8/NOPB, LM1117MPX-1.8/NOPB, LD1117S18TR, and NCP1117ST18T3G all provide 1.2V dropout at 800mA, compared to 1.3V for the original part.

Q: Can I use a substitute with extended temperature range (-40°C to 125°C) in a design specified for 0°C to 125°C?

A: Yes. Extended temperature range parts are suitable for applications with narrower temperature requirements. No design modifications are necessary.

Q: What is the difference between LD1117S18CTR and LD1117S18TR?

A: Both are STMicroelectronics 800mA regulators with identical output voltage and current specifications. The LD1117S18TR provides lower dropout voltage (1.2V versus 1.3V at 800mA). Both support extended operating temperature range (-40°C to 125°C for LD1117S18CTR; 0°C to 125°C for LD1117S18TR).

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