LP8340IDT-5.0/NOPB Equivalent & Substitute Parts

Part Overview

The LP8340IDT-5.0/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 5V output at 1A current capacity in a TO-252-3 surface mount package. This part is classified as obsolete, making equivalent and substitute parts necessary for new designs and production continuity. The device provides regulated 5V output with integrated over-current and over-temperature protection, suitable for applications requiring stable low-voltage power distribution.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	5V
Output Current	1A
Input Voltage (Max)	10V
Voltage Dropout (Max)	0.8V @ 1A
Quiescent Current (Iq)	100 µA
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP8340IDT-5.0/NOPB are selected based on the following critical parameters that determine functional equivalence:

Output voltage fixed at 5V
Output current capacity of 1A
Maximum input voltage of 10V or greater
TO-252-3 package compatibility
Operating temperature range of -40°C to 125°C or wider
Surface mount mounting type
Over-temperature protection (mandatory)

The two identified substitute parts meet these core electrical and mechanical requirements while offering active product status and improved availability compared to the obsolete main part.

Parameter Comparison

Parameter	LP8340IDT-5.0/NOPB (Main)	LP38690DT-5.0/NOPB (Substitute)	BA50BC0FP-E2 (Substitute)
Manufacturer	Texas Instruments	National Semiconductor	Rohm Semiconductor
Product Status	Obsolete	Active	Active
Output Voltage (Fixed)	5V	5V	5V
Output Current	1A	1A	1A
Input Voltage (Max)	10V	10V	16V
Voltage Dropout (Max)	0.8V @ 1A	0.8V @ 1A	Not specified
Quiescent Current (Iq)	100 µA	55 µA	0.5 mA
Package / Case	TO-252-3	TO-252-3	TO-252-3
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 105°C
Over-Temperature Protection	Yes	Yes	Yes
Over-Current Protection	Yes	No	Yes
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant
Inventory Status	1121 Pcs	3010 Pcs	121300 Pcs

Engineering Selection Recommendations

Both substitute parts are classified as active products, providing superior long-term availability and supply chain continuity compared to the obsolete LP8340IDT-5.0/NOPB.

The LP38690DT-5.0/NOPB from National Semiconductor provides the closest electrical match to the main part, with identical output voltage, current rating, input voltage maximum, and operating temperature range. This part features lower quiescent current (55 µA versus 100 µA), reducing standby power consumption. However, it lacks over-current protection, which is present in the original design.

The BA50BC0FP-E2 from Rohm Semiconductor offers the highest input voltage tolerance (16V maximum) and maintains both over-current and over-temperature protection. This part has a narrower operating temperature range (-40°C to 105°C versus -125°C) and higher quiescent current (0.5 mA). Both substitute parts are ROHS3 compliant and available in the same TO-252-3 package.

Selection between substitutes depends on application requirements: choose LP38690DT-5.0/NOPB for lowest standby power consumption with identical thermal range, or BA50BC0FP-E2 for higher input voltage tolerance and over-current protection retention.

Frequently Asked Questions (FAQ)

Q: Can LP38690DT-5.0/NOPB replace LP8340IDT-5.0/NOPB directly?

A: Yes, for applications where over-current protection is not critical. Both parts share identical output voltage (5V), output current (1A), input voltage maximum (10V), and operating temperature range (-40°C to 125°C). The LP38690DT-5.0/NOPB features lower quiescent current but lacks over-current protection present in the original part.

Q: Can BA50BC0FP-E2 replace LP8340IDT-5.0/NOPB directly?

A: Yes, with temperature range consideration. The BA50BC0FP-E2 maintains 5V output, 1A current, and both over-current and over-temperature protection. It supports higher input voltage (16V maximum) but operates only to 105°C maximum, compared to 125°C for the original part. Applications requiring full -40°C to 125°C range should verify compatibility.

Q: Are all three parts in the same package?

A: Yes. All three parts use the TO-252-3 package (DPAK with 2 leads plus tab, SC-63 designation), ensuring mechanical and pin compatibility on PCBs designed for the LP8340IDT-5.0/NOPB.

Q: What is the primary reason to substitute the LP8340IDT-5.0/NOPB?

A: The LP8340IDT-5.0/NOPB is classified as obsolete. Both substitute parts are active products with superior availability and long-term supply chain support.

Q: Do the substitute parts have the same protection features?

A: The LP38690DT-5.0/NOPB provides over-temperature protection only. The BA50BC0FP-E2 provides both over-current and over-temperature protection, matching the original part's protection feature set.

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