LP8345IDTX-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP8345IDTX-3.3/NOPB is a linear voltage regulator IC manufactured by Texas Instruments, designed to deliver a fixed 3.3V output at 500mA in a TO-252-3 surface mount package. This device is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing production, maintenance, and design updates. The regulator provides over-current and over-temperature protection suitable for applications requiring stable 3.3V power delivery from input sources up to 10V.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	500mA
Input Voltage (Max)	10V
Voltage Dropout (Max)	0.5V @ 500mA
Quiescent Current	50 µA
Package Type	TO-252-3 (DPAK)
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitute parts for the LP8345IDTX-3.3/NOPB are selected based on the following critical parameters:

Fixed 3.3V output voltage
Surface mount TO-252-3 package compatibility
Output current capability of 500mA or greater
Over-current and over-temperature protection
RoHS3 compliance and MSL Level 1 rating
Active product status for long-term availability

The two identified substitutes meet these core requirements while maintaining electrical and mechanical compatibility with the original design.

Parameter Comparison

Parameter	LP8345IDTX-3.3/NOPB (TI)	BD33KA5FP-E2 (Rohm)	LD1117ADT33TR (STMicroelectronics)
Output Voltage	3.3V	3.3V	3.3V
Output Current	500mA	500mA	1A
Input Voltage (Max)	10V	5.5V	15V
Voltage Dropout (Max)	0.5V @ 500mA	0.2V @ 200mA	1.3V @ 1A
Quiescent Current	50 µA	550 µA	10 mA
PSRR	55dB (120Hz)	50dB (120Hz)	75dB (120Hz)
Package Type	TO-252-3	TO-252-3	TO-252-3
Operating Temperature	-40°C ~ 125°C	-40°C ~ 105°C	0°C ~ 125°C
Product Status	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

BD33KA5FP-E2 (Rohm Semiconductor): This substitute is recommended for applications where input voltage does not exceed 5.5V and operating temperature remains within -40°C to 105°C. The device offers superior dropout voltage performance at 0.2V @ 200mA and maintains identical 500mA output current capability. Active product status ensures long-term availability and supply chain stability. RoHS3 compliance and MSL Level 1 rating match the original specification.

LD1117ADT33TR (STMicroelectronics): This substitute provides higher output current capability at 1A and extended input voltage tolerance up to 15V, offering greater design margin for applications with variable input sources. Superior PSRR performance at 75dB (120Hz) provides enhanced noise rejection. Active product status and full RoHS3 compliance support production continuity. Operating temperature range extends to 125°C maximum, matching the original device. Higher quiescent current (10 mA) and dropout voltage (1.3V @ 1A) require evaluation against specific application requirements.

Frequently Asked Questions (FAQ)

Q: Can BD33KA5FP-E2 directly replace LP8345IDTX-3.3/NOPB in all applications?

A: BD33KA5FP-E2 is suitable for applications where input voltage remains below 5.5V and operating temperature does not exceed 105°C. The lower maximum input voltage specification requires circuit review to confirm compatibility with your power source.

Q: What are the key differences between the two substitute options?

A: BD33KA5FP-E2 offers lower dropout voltage and lower quiescent current but has a 5.5V maximum input limit and 105°C maximum operating temperature. LD1117ADT33TR provides higher output current (1A), higher input voltage tolerance (15V), and superior PSRR performance, but draws higher quiescent current and exhibits higher dropout voltage.

Q: Are both substitutes available in the same TO-252-3 package?

A: Yes. Both BD33KA5FP-E2 and LD1117ADT33TR are supplied in TO-252-3 (DPAK) packages, ensuring mechanical and thermal compatibility with the original LP8345IDTX-3.3/NOPB footprint.

Q: Do the substitute parts maintain RoHS3 and MSL Level 1 compliance?

A: Yes. Both BD33KA5FP-E2 and LD1117ADT33TR are RoHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original device specifications.

Q: Which substitute should be selected for extended temperature range applications?

A: LD1117ADT33TR supports the full -40°C to 125°C operating range matching the original device. BD33KA5FP-E2 is limited to -40°C to 105°C and is not suitable for applications requiring operation above 105°C.

Q: How do dropout voltage differences affect circuit design?

A: BD33KA5FP-E2 exhibits 0.2V dropout at 200mA, providing superior efficiency in low-voltage input scenarios. LD1117ADT33TR shows 1.3V dropout at 1A, requiring higher input voltage headroom but offering greater output current capacity. Circuit design must account for minimum input voltage requirements based on the selected substitute.

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