LP3852ES-3.3 Equivalent & Substitute Parts

Part Overview

The LP3852ES-3.3 is a linear voltage regulator IC from Texas Instruments, delivering a fixed 3.3V output at 1.5A in a TO-263 (DDPAK-5) surface mount package. This device is classified as Last Time Buy, indicating discontinued production. Equivalent and substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability for applications requiring 3.3V regulation in compact thermal packages.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	1.5A
Input Voltage (Max)	7V
Voltage Dropout (Max)	0.38V @ 1.5A
Quiescent Current (Iq)	3 mA
Package Type	TO-263 (DDPAK-5)
Operating Temperature Range	-40°C to 125°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LP3852ES-3.3 are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents (Identical Specifications): Parts that match all critical parameters including output voltage, output current, input voltage rating, package type, and thermal characteristics. These parts are pin-compatible and functionally interchangeable without circuit modification.

Parametric Equivalents (Functional Compatibility with Parameter Variations): Parts that maintain the same output voltage (3.3V), output current (1.5A), package type (TO-263), and operating temperature range, but may differ in voltage dropout, quiescent current, or supply current specifications. These parts are suitable for applications where the specific parameter variation does not impact system performance.

Key Substitution Criteria:

Output voltage: 3.3V (fixed)
Output current capability: 1.5A minimum
Package: TO-263 (DDPAK-5) surface mount
Operating temperature: -40°C to 125°C
Control features: Enable function required
Protection: Over current, over temperature, short circuit protection

Parameter Comparison

Part Number	Manufacturer	Product Status	Output Voltage	Output Current	Input Voltage (Max)	Dropout @ 1.5A	Iq (mA)	Package	RoHS
LP3852ES-3.3	Texas Instruments	Last Time Buy	3.3V	1.5A	7V	0.38V	3	TO-263-5	ROHS3
LP3852ES-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	7V	0.38V	3	TO-263-5	ROHS3
LP3855ES-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	7V	0.38V	3	TO-263-5	ROHS3
LP3872ES-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	7V	0.55V	5	TO-263-5	ROHS3
LP3875ES-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	7V	0.55V	5	TO-263-5	ROHS3
LP3962ES-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	7V	0.55V	9	TO-263-5	ROHS3
LP3965ES-3.3	Texas Instruments	Last Time Buy	3.3V	1.5A	7V	0.55V	9	TO-263-5	ROHS3
LP3965ES-3.3/NOPB	Texas Instruments	Active	3.3V	1.5A	7V	0.55V	9	TO-263-5	ROHS3
MIC29151-3.3WU	Microchip Technology	Active	3.3V	1.5A	26V	0.6V	—	TO-263-5	ROHS3
MIC29151-3.3WU-TR	Microchip Technology	Active	3.3V	1.5A	26V	0.6V	—	TO-263-5	ROHS3

Engineering Selection Recommendations

First Priority - Direct Equivalents: LP3852ES-3.3/NOPB and LP3855ES-3.3/NOPB are direct functional equivalents with Active product status. Both maintain identical electrical specifications to the original LP3852ES-3.3, including 0.38V dropout voltage and 3 mA quiescent current. These parts are recommended for immediate substitution in new designs and production restocking.

Secondary Priority - Texas Instruments Parametric Equivalents: LP3872ES-3.3/NOPB, LP3875ES-3.3/NOPB, LP3962ES-3.3/NOPB, and LP3965ES-3.3/NOPB are Active status alternatives from Texas Instruments. These parts accept the same input voltage range (7V max) and deliver identical output specifications (3.3V, 1.5A). Voltage dropout increases to 0.55V and quiescent current rises to 5-9 mA. These substitutes are suitable for applications where the increased dropout and standby current do not compromise system performance.

Alternative Manufacturer Option: MIC29151-3.3WU and MIC29151-3.3WU-TR from Microchip Technology provide cross-manufacturer compatibility. These parts accept higher input voltage (26V max) and include additional protection features (reverse polarity, transient voltage). The MIC29151-3.3WU-TR variant is supplied in Tape & Reel packaging for high-volume production. Microchip parts are suitable for designs requiring extended input voltage tolerance or enhanced protection.

Compliance and Availability: All substitute parts are ROHS3 compliant and carry REACH Unaffected or REACH Affected status consistent with the original part. Inventory availability ranges from 1,105 to 12,300 units across substitute options, ensuring supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can LP3852ES-3.3/NOPB be used as a direct replacement for LP3852ES-3.3? A: Yes. LP3852ES-3.3/NOPB is a direct equivalent with identical electrical and mechanical specifications. The /NOPB suffix indicates lead-free, RoHS-compliant packaging. This part is Active status and recommended for new designs.

Q: What is the difference between LP3855ES-3.3/NOPB and LP3872ES-3.3/NOPB? A: Both parts deliver 3.3V at 1.5A in TO-263 packaging. LP3855ES-3.3/NOPB maintains 0.38V dropout voltage and 3 mA quiescent current, matching the original LP3852ES-3.3. LP3872ES-3.3/NOPB increases dropout to 0.55V and quiescent current to 5 mA. Select LP3855ES-3.3/NOPB for applications sensitive to dropout voltage or standby power consumption.

Q: Why does MIC29151-3.3WU accept 26V input while LP3852ES-3.3 accepts only 7V? A: The MIC29151-3.3WU is designed for broader input voltage applications. The higher input rating does not affect 3.3V output performance but provides flexibility for systems with variable supply voltages. Both parts are pin-compatible in TO-263 packaging.

Q: What is the difference between MIC29151-3.3WU and MIC29151-3.3WU-TR? A: Both parts are electrically identical. MIC29151-3.3WU is supplied in Tube packaging for lower-volume applications. MIC29151-3.3WU-TR is supplied in Tape & Reel (TR) format for automated assembly and high-volume production.

Q: Are all substitute parts pin-compatible with LP3852ES-3.3? A: Yes. All substitute parts use the TO-263 (DDPAK-5) package with identical pinout. No PCB layout modifications are required for substitution.

Q: Which substitute part has the lowest quiescent current? A: LP3852ES-3.3/NOPB and LP3855ES-3.3/NOPB both maintain 3 mA quiescent current, matching the original LP3852ES-3.3. These parts are optimal for battery-powered or low-standby-power applications.

Q: Can I use LP3965ES-3.3/NOPB in place of LP3852ES-3.3 in a production design? A: Yes, with design verification. LP3965ES-3.3/NOPB is functionally compatible but has higher dropout voltage (0.55V vs. 0.38V) and quiescent current (9 mA vs. 3 mA). Confirm that your power supply headroom and standby power budget accommodate these differences.

Q: What protection features do all substitute parts include? A: All Texas Instruments substitutes (LP3852, LP3855, LP3872, LP3875, LP3962, LP3965 series) include over current, over temperature, and short circuit protection. Microchip MIC29151 parts add reverse polarity and transient voltage protection.

Q: Is LP3852ES-3.3 still available for new orders? A: LP3852ES-3.3 is classified as Last Time Buy, indicating production discontinuation. LP3852ES-3.3/NOPB (Active status) is the recommended replacement with 2,000 units in stock. Alternative Active status parts include LP3855ES-3.3/NOPB, LP3872ES-3.3/NOPB, LP3875ES-3.3/NOPB, LP3962ES-3.3/NOPB, LP3965ES-3.3/NOPB, and Microchip MIC29151 variants.

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