LP8340CDT-3.3/NOPB Equivalent & Substitute Parts

Part Overview

The LP8340CDT-3.3/NOPB is a linear voltage regulator IC from Texas Instruments designed for positive fixed 3.3V output at 1A current capacity in a TO-252-3 surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The part delivers regulated 3.3V output with integrated over-current and over-temperature protection, suitable for applications requiring stable low-voltage power distribution.

Key Parameters

Parameter	Value
Manufacturer Part Number	LP8340CDT-3.3/NOPB
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Description	IC REG LINEAR 3.3V 1A TO252-3
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Min/Fixed)	3.3V
Current - Output	1A
Voltage - Input (Max)	10V
Voltage Dropout (Max)	1V @ 1A
Package / Case	TO-252-3, DPAK (2 Leads + Tab), SC-63
Mounting Type	Surface Mount
Operating Temperature	0°C ~ 125°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP8340CDT-3.3/NOPB are qualified based on the following critical parameters:

Output voltage: 3.3V fixed
Output current capacity: 1A minimum
Package type: TO-252-3 (DPAK with 2 leads + tab)
Mounting: Surface mount
Output configuration: Positive fixed regulator
Protection features: Over-temperature protection (mandatory); over-current protection (preferred)

The LP38690DT-3.3/NOPB from National Semiconductor and BA33BC0FP-E2 from Rohm Semiconductor meet these core substitution criteria. Both devices maintain identical output voltage and current specifications, identical package configuration, and compatible thermal operating ranges. Both substitute parts carry active product status, ensuring long-term availability and supply chain continuity.

Parameter Comparison

Parameter	LP8340CDT-3.3/NOPB (Main)	LP38690DT-3.3/NOPB (Substitute)	BA33BC0FP-E2 (Substitute)
Manufacturer	Texas Instruments	National Semiconductor	Rohm Semiconductor
Product Status	Obsolete	Active	Active
Output Voltage (Fixed)	3.3V	3.3V	3.3V
Output Current	1A	1A	1A
Voltage - Input (Max)	10V	10V	16V
Voltage Dropout (Max)	1V @ 1A	1V @ 1A	Not specified
Current - Quiescent (Iq)	100 µA	55 µA	0.5 mA
PSRR	55dB (120Hz)	55dB (120Hz)	Not specified
Package / Case	TO-252-3	TO-252-3	TO-252-3
Operating Temperature	0°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 105°C
Protection Features	Over Current, Over Temperature	Over Temperature	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant	Not specified	ROHS3 Compliant

Engineering Selection Recommendations

Both substitute parts are qualified for direct replacement of the obsolete LP8340CDT-3.3/NOPB based on electrical and mechanical compatibility.

The LP38690DT-3.3/NOPB from National Semiconductor offers active product status with extended lower operating temperature range (-40°C vs. 0°C), lower quiescent current (55 µA vs. 100 µA), and identical electrical performance. This part is recommended for applications requiring improved power efficiency and extended cold-temperature operation.

The BA33BC0FP-E2 from Rohm Semiconductor provides active product status with higher maximum input voltage rating (16V vs. 10V), dual protection features (over-current and over-temperature), and ROHS3 compliance certification. This part is recommended for applications with higher input voltage requirements or where dual protection redundancy is specified.

Both substitute parts maintain TO-252-3 package compatibility, identical 3.3V output voltage, and 1A output current capacity. Selection between substitutes depends on specific application requirements regarding input voltage range, quiescent current performance, and operating temperature extremes.

Frequently Asked Questions (FAQ)

Q: Can LP38690DT-3.3/NOPB and BA33BC0FP-E2 be used interchangeably with LP8340CDT-3.3/NOPB?

A: Both parts are electrically and mechanically compatible substitutes. They maintain identical output voltage (3.3V), output current (1A), and TO-252-3 package configuration. Pin-to-pin compatibility is preserved. Selection between them depends on application-specific requirements for input voltage range, quiescent current, and operating temperature.

Q: What is the primary reason for substitution?

A: The LP8340CDT-3.3/NOPB is classified as obsolete. Both substitute parts carry active product status, ensuring continued availability and supply chain reliability for new designs and production.

Q: Are there differences in protection features?

A: The LP8340CDT-3.3/NOPB and BA33BC0FP-E2 both include over-current and over-temperature protection. The LP38690DT-3.3/NOPB includes over-temperature protection only. Applications requiring dual protection should specify BA33BC0FP-E2.

Q: How do quiescent current specifications compare?

A: LP8340CDT-3.3/NOPB: 100 µA; LP38690DT-3.3/NOPB: 55 µA; BA33BC0FP-E2: 0.5 mA. The LP38690DT-3.3/NOPB offers the lowest quiescent current, beneficial for battery-powered or low-power standby applications.

Q: What is the maximum input voltage for each part?

A: LP8340CDT-3.3/NOPB and LP38690DT-3.3/NOPB: 10V maximum. BA33BC0FP-E2: 16V maximum. Applications with input voltages exceeding 10V require BA33BC0FP-E2.

Q: Are all parts RoHS compliant?

A: LP8340CDT-3.3/NOPB and BA33BC0FP-E2 are ROHS3 compliant. RoHS status for LP38690DT-3.3/NOPB is not specified in available documentation.

Q: Do operating temperature ranges differ?

A: LP8340CDT-3.3/NOPB: 0°C ~ 125°C. LP38690DT-3.3/NOPB: -40°C ~ 125°C. BA33BC0FP-E2: -40°C ~ 105°C. Applications requiring extended cold-temperature operation should specify LP38690DT-3.3/NOPB or BA33BC0FP-E2.

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