LP8345CDTX-2.5/NOPB Equivalent & Substitute Parts

Part Overview

The LP8345CDTX-2.5/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 2.5V output applications with 500mA current capacity in a TO-252-3 surface mount package. This part is classified as obsolete, making identification of active equivalent substitutes necessary for new designs and ongoing production support. The LP38691DT-2.5/NOPB serves as the manufacturer-recommended replacement, offering improved specifications while maintaining functional and package compatibility.

Key Parameters

Parameter	LP8345CDTX-2.5/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Product Status	Obsolete
Output Voltage (Fixed)	2.5V
Output Current	500mA
Input Voltage (Max)	10V
Voltage Dropout (Max)	0.65V @ 500mA
Quiescent Current	50 µA
PSRR	55dB (120Hz)
Operating Temperature Range	0°C ~ 125°C
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant
MSL Rating	3 (168 Hours)

Substitute Part Grouping Explanation

Substitution of the LP8345CDTX-2.5/NOPB is determined by the following critical parameters:

Output voltage specification: 2.5V fixed
Output current capacity: 500mA minimum
Input voltage maximum: 10V or greater
Package compatibility: TO-252-3 (DPAK)
Surface mount configuration
Regulatory compliance: ROHS3 Compliant

The LP38691DT-2.5/NOPB qualifies as a direct substitute based on matching all critical electrical and mechanical parameters. The substitute maintains identical output voltage, current rating, input voltage specification, and package form factor. Both parts are manufactured by Texas Instruments and comply with ROHS3 requirements.

Parameter Comparison

Parameter	LP8345CDTX-2.5/NOPB	LP38691DT-2.5/NOPB	Compatibility
Output Voltage (Fixed)	2.5V	2.5V	Identical
Output Current	500mA	500mA	Identical
Input Voltage (Max)	10V	10V	Identical
Voltage Dropout (Max)	0.65V @ 500mA	0.73V @ 500mA	Compatible (0.08V difference)
Quiescent Current	50 µA	55 µA	Compatible (5 µA difference)
PSRR	55dB (120Hz)	55dB (120Hz)	Identical
Operating Temperature Range	0°C ~ 125°C	-40°C ~ 125°C	Compatible (substitute has wider range)
Package / Case	TO-252-3, DPAK	TO-252-3, DPAK	Identical
Protection Features	Over Current, Over Temperature	Over Temperature	Compatible (substitute has reduced protection set)
Product Status	Obsolete	Active	Substitute is active production
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
MSL Rating	3 (168 Hours)	2 (1 Year)	Compatible (substitute has better moisture rating)

Engineering Selection Recommendations

The LP38691DT-2.5/NOPB is the manufacturer-recommended substitute for the obsolete LP8345CDTX-2.5/NOPB. Selection of the LP38691DT-2.5/NOPB is supported by the following factors:

Active product status ensures long-term availability and supply chain continuity
ROHS3 compliance maintained across both parts
Identical electrical performance for output voltage, current, and PSRR specifications
Improved moisture sensitivity level (MSL 2 versus MSL 3) provides better handling characteristics
Extended operating temperature range (-40°C to 125°C) offers broader application flexibility
Pin-compatible TO-252-3 package enables direct board-level replacement
Manufacturer recommendation from Texas Instruments confirms functional equivalence

Frequently Asked Questions (FAQ)

Q: Can the LP38691DT-2.5/NOPB be used as a direct replacement for the LP8345CDTX-2.5/NOPB?

A: Yes. Both parts share identical output voltage (2.5V), output current (500mA), input voltage maximum (10V), and TO-252-3 package configuration. Pin compatibility and electrical performance are equivalent for standard linear regulator applications.

Q: What are the differences between these two parts?

A: The LP38691DT-2.5/NOPB has a slightly higher voltage dropout specification (0.73V versus 0.65V at 500mA), marginally higher quiescent current (55 µA versus 50 µA), reduced over-current protection (over-temperature protection only), an extended operating temperature range (-40°C to 125°C versus 0°C to 125°C), and an improved moisture sensitivity level (MSL 2 versus MSL 3). The LP38691DT-2.5/NOPB is an active product while the LP8345CDTX-2.5/NOPB is obsolete.

Q: Are there any thermal or power dissipation considerations when substituting?

A: Both parts are rated for 500mA output current in the same TO-252-3 package. Thermal performance is comparable. Applications operating at maximum current and elevated ambient temperatures should account for the slightly higher dropout voltage of the LP38691DT-2.5/NOPB (0.08V additional drop), which may result in marginally increased power dissipation.

Q: Is the packaging identical between these parts?

A: Yes. Both parts use the TO-252-3 package (DPAK with 2 leads plus tab, SC-63 designation). PCB footprints and mounting procedures are identical.

Q: What is the significance of the MSL rating difference?

A: The LP38691DT-2.5/NOPB has MSL 2 (1 year floor life) compared to MSL 3 (168 hours floor life) for the LP8345CDTX-2.5/NOPB. This indicates the substitute part has superior moisture resistance and longer shelf life after moisture exposure, reducing risk of moisture-related failures during storage and assembly.

Q: Are both parts RoHS compliant?

A: Yes. Both the LP8345CDTX-2.5/NOPB and LP38691DT-2.5/NOPB are ROHS3 compliant, meeting lead-free and restricted substance requirements.

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