LP8345CLD-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP8345CLD-3.3/NOPB is a linear voltage regulator IC from Texas Instruments designed to deliver a fixed 3.3V output at 500mA. This device is packaged in a 6-WSON (2.92x3.29mm) surface mount configuration with an exposed pad for thermal management. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Key Parameters

Parameter	LP8345CLD-3.3/NOPB
Output Voltage (Fixed)	3.3V
Output Current	500mA
Input Voltage (Max)	10V
Dropout Voltage (Max)	0.5V @ 500mA
Quiescent Current	50 µA
PSRR	55dB (120Hz)
Operating Temperature Range	0°C ~ 125°C
Package Type	6-WSON Exposed Pad
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution eligibility for the LP8345CLD-3.3/NOPB is determined by the following core parameters:

Fixed output voltage of 3.3V
Minimum output current rating of 500mA
Positive output configuration
Surface mount technology
Over current and over temperature protection
ROHS3 compliance

The three substitute parts listed meet these core functional requirements. However, they differ in packaging format, input voltage ratings, dropout characteristics, and quiescent current specifications. Selection depends on PCB layout constraints, thermal management requirements, and input voltage availability in the target application.

Parameter Comparison

Parameter	LP8345CLD-3.3/NOPB	REG103GA-3.3	BD33KA5FP-E2	LD39050PU33R
Manufacturer	Texas Instruments	Texas Instruments	Rohm Semiconductor	STMicroelectronics
Output Voltage	3.3V	3.3V	3.3V	3.3V
Output Current	500mA	500mA	500mA	500mA
Input Voltage (Max)	10V	15V	5.5V	5.5V
Dropout Voltage (Max)	0.5V @ 500mA	0.28V @ 500mA	0.2V @ 200mA	0.4V @ 500mA
Quiescent Current	50 µA	0.7 mA	550 µA	50 µA
PSRR	55dB (120Hz)	65dB (120Hz)	50dB (120Hz)	65dB ~ 62dB (1kHz ~ 10kHz)
Operating Temperature	0°C ~ 125°C	-40°C ~ 85°C	-40°C ~ 105°C	-40°C ~ 125°C
Package / Case	6-WSON Exposed Pad	SOT-223-6	TO-252-3 (DPAK)	6-VDFN Exposed Pad
Product Status	Obsolete	Last Time Buy	Active	Active
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

REG103GA-3.3 (Texas Instruments, Last Time Buy): This part maintains Texas Instruments lineage and offers superior dropout voltage (0.28V) and PSRR (65dB). The higher input voltage rating (15V) provides greater design flexibility. However, the SOT-223-6 package is larger than the original 6-WSON, and quiescent current is elevated at 0.7mA. Operating temperature range is limited to -40°C ~ 85°C, which is narrower than the original specification.

BD33KA5FP-E2 (Rohm Semiconductor, Active): This part is currently in active production with the highest inventory availability (36,775 pcs). The TO-252 package offers superior thermal dissipation through a larger tab structure. Dropout voltage is lowest at 0.2V @ 200mA. Input voltage is limited to 5.5V maximum. Quiescent current is elevated at 550µA. This option is suitable for applications with constrained input voltage and thermal management requirements.

LD39050PU33R (STMicroelectronics, Active): This part matches the original quiescent current specification (50µA) and operating temperature range (0°C ~ 125°C). The 6-DFN package is compact and similar in footprint to the original 6-WSON. Additional protection features include short circuit protection and power good output. Input voltage is limited to 5.5V. This option provides the closest functional match to the original part.

Frequently Asked Questions (FAQ)

Q: Can REG103GA-3.3 be used as a direct replacement for LP8345CLD-3.3/NOPB?

A: REG103GA-3.3 is functionally equivalent in output voltage and current rating but requires PCB layout modification due to different packaging (SOT-223-6 vs. 6-WSON). The higher input voltage rating (15V) and improved dropout voltage make it suitable for most applications, provided the operating temperature range of -40°C ~ 85°C meets system requirements.

Q: What are the package compatibility constraints?

A: The original LP8345CLD-3.3/NOPB uses a 6-WSON package (2.92x3.29mm). REG103GA-3.3 uses SOT-223-6, which is larger. BD33KA5FP-E2 uses TO-252 (DPAK), which is the largest option. LD39050PU33R uses 6-VDFN (3x3mm), which is comparable in footprint to the original. Package selection depends on available PCB real estate and thermal management strategy.

Q: Which substitute has the lowest power dissipation?

A: LD39050PU33R and the original LP8345CLD-3.3/NOPB both have 50µA quiescent current, the lowest among all options. REG103GA-3.3 has 0.7mA, and BD33KA5FP-E2 has 550µA. For battery-powered or low-power applications, LD39050PU33R is preferred.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All three substitute parts and the original LP8345CLD-3.3/NOPB are ROHS3 compliant and REACH unaffected.

Q: What is the difference in dropout voltage performance?

A: BD33KA5FP-E2 offers the lowest dropout at 0.2V @ 200mA. REG103GA-3.3 provides 0.28V @ 500mA. LD39050PU33R delivers 0.4V @ 500mA. The original part specifies 0.5V @ 500mA. Lower dropout voltage reduces heat dissipation and allows operation with lower input voltages.

Q: Which substitute supports the widest input voltage range?

A: REG103GA-3.3 supports input voltages up to 15V, compared to 10V for the original part. BD33KA5FP-E2 and LD39050PU33R are both limited to 5.5V maximum input voltage.

Q: Does LD39050PU33R offer additional protection features?

A: Yes. LD39050PU33R includes short circuit protection in addition to over current and over temperature protection. It also provides a power good output for system monitoring. The original part and other substitutes include only over current and over temperature protection.

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