ZXCL280E5TA Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The ZXCL280E5TA is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed 2.8V output at 150mA in a compact SOT-23-5 surface mount package. This device features enable control, over-current protection, and over-temperature protection, operating across the industrial temperature range of -40°C to 85°C.

The ZXCL280E5TA is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this voltage regulation topology.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.8V
Output Current	150mA
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.28V @ 100mA
Quiescent Current	50 µA
Control Features	Enable
Protection Features	Over Current, Over Temperature
Operating Temperature Range	-40°C to 85°C
Package Type	SOT-23-5 (SC-74A)
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the ZXCL280E5TA are selected based on the following critical parameters:

Primary Substitution Criteria:

Fixed output voltage of 2.8V or 2.85V (±1.8% tolerance acceptable for 2.85V variants)
Output current capability of 150mA or greater
Maximum input voltage of 5.5V or higher
Enable control feature
Over-current and over-temperature protection
Surface mount packaging (SOT-23-5, SOT-25, or 5-SSOP)
Operating temperature range of -40°C to 85°C or extended range
ROHS3 compliance

Substitution Categories:

Category 1: Direct Pin-Compatible Replacements (SOT-23-5 Package) Parts maintaining identical pinout and package footprint with equivalent or superior electrical performance.

Category 2: Functional Equivalents (Alternative Packages) Parts with identical electrical specifications but different surface mount packages (SOT-25, 5-SSOP, TSOT-23-5) requiring PCB layout modification.

Category 3: Enhanced Performance Alternatives Parts exceeding minimum specifications in output current, dropout voltage, or quiescent current while maintaining core functionality.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage (Max)	Quiescent Current	Package	Product Status
ZXCL280E5TA	Diodes Incorporated	2.8V	150mA	5.5V	0.28V @ 100mA	50 µA	SOT-23-5	Obsolete
AP7115-28WG-7	Diodes Incorporated	2.8V	150mA	5.5V	0.3V @ 150mA	80 µA	SOT-25	Active
LP5951MF-2.8/NOPB	Texas Instruments	2.8V	150mA	5.5V	0.35V @ 150mA	55 µA	SOT-23-5	Active
LP5907MFX-2.8/NOPB	Texas Instruments	2.8V	250mA	5.5V	0.25V @ 250mA	25 µA	SOT-23-5	Active
MIC5307-2.8YD5-TR	Microchip Technology	2.8V	300mA	5.5V	0.25V @ 300mA	30 µA	TSOT-23-5	Active
BU28SD2MG-MTR	Rohm Semiconductor	2.8V	200mA	6V	0.15V @ 100mA	80 µA	5-SSOP	Active
BU28TD3WG-TR	Rohm Semiconductor	2.8V	200mA	6V	0.5V @ 200mA	60 µA	5-SSOP	Active
MIC5365-2.85YD5-TR	Microchip Technology	2.85V	150mA	5.5V	0.31V @ 150mA	39 µA	TSOT-23-5	Active
LP5907MFX-2.85/NOPB	Texas Instruments	2.85V	250mA	5.5V	0.25V @ 250mA	25 µA	SOT-23-5	Active

Engineering Selection Recommendations

For Direct Replacement (No PCB Modification Required):

LP5951MF-2.8/NOPB is the primary recommendation for direct substitution. This Texas Instruments part maintains identical SOT-23-5 packaging and 2.8V fixed output specification. The part is in active production status with ROHS3 compliance. Electrical parameters remain within acceptable tolerance for the original application, with quiescent current of 55 µA compared to the original 50 µA.

LP5907MFX-2.8/NOPB provides enhanced performance in the same SOT-23-5 package with 250mA output current capability, superior quiescent current of 25 µA, and improved dropout voltage of 0.25V. This part is suitable for applications requiring additional current margin or lower power consumption. Active production status and ROHS3 compliance are confirmed.

For Applications Permitting Package Change:

MIC5307-2.8YD5-TR (Microchip Technology) offers 300mA output current in TSOT-23-5 package with 0.25V dropout voltage and 30 µA quiescent current. This part is active and ROHS3 compliant, suitable for designs requiring higher current capacity with minimal PCB footprint increase.

BU28SD2MG-MTR (Rohm Semiconductor) provides automotive-grade qualification (AEC-Q100) with 200mA output current and superior 0.15V dropout voltage at 100mA. Extended operating temperature to 105°C and higher input voltage rating (6V) are available. This part requires 5-SSOP package accommodation and is active in production.

For 2.85V Output Tolerance Applications:

MIC5365-2.85YD5-TR maintains 150mA output current with improved quiescent current of 39 µA and PSRR of 80dB at 1kHz. TSOT-23-5 package requires PCB layout modification. Active production status and ROHS3 compliance confirmed.

LP5907MFX-2.85/NOPB provides 250mA output current with superior performance metrics in SOT-23-5 package. Suitable for applications where 2.85V output is acceptable and higher current capacity is beneficial.

Frequently Asked Questions (FAQ)

Q: Can LP5951MF-2.8/NOPB be used as a direct drop-in replacement for ZXCL280E5TA?

A: Yes. Both parts feature identical SOT-23-5 packaging, 2.8V fixed output voltage, 150mA output current, and 5.5V maximum input voltage. Pin configuration and functional control features (Enable) are compatible. The quiescent current difference of 5 µA is negligible for most applications.

Q: What is the difference between SOT-23-5 and TSOT-23-5 packages?

A: TSOT-23-5 is a thin variant of SOT-23-5 with reduced height. Both packages have identical pin pitch and footprint dimensions. TSOT-23-5 parts (such as MIC5307-2.8YD5-TR and MIC5365-2.85YD5-TR) are mechanically compatible with SOT-23-5 PCB layouts but offer improved thermal performance due to reduced package height.

Q: Can I use a 2.85V output part in place of the 2.8V specification?

A: A 2.85V output represents a 1.8% increase from the 2.8V specification. Compatibility depends on the application's voltage tolerance. If the design accepts ±2% or greater tolerance on the regulated output, 2.85V variants such as MIC5365-2.85YD5-TR or LP5907MFX-2.85/NOPB are suitable. Verify the downstream circuit's voltage specifications before substitution.

Q: Why do some substitute parts have higher output current ratings?

A: Parts such as LP5907MFX-2.8/NOPB (250mA) and MIC5307-2.8YD5-TR (300mA) provide additional current capacity beyond the original 150mA specification. These parts are backward compatible for 150mA applications and offer design margin for future current requirements or parallel load distribution. Higher current capability does not negatively impact lower-current applications.

Q: What is the significance of dropout voltage differences?

A: Dropout voltage determines the minimum input-to-output voltage differential required for regulation. The ZXCL280E5TA specifies 0.28V at 100mA. Substitute parts with lower dropout voltage (such as BU28SD2MG-MTR at 0.15V) provide improved efficiency and allow operation with lower input voltages. Higher dropout voltage specifications require proportionally higher input voltage headroom.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the original ZXCL280E5TA.

Q: Which substitute part offers the best quiescent current performance?

A: LP5907MFX-2.8/NOPB and LP5907MFX-2.85/NOPB both feature 25 µA quiescent current, representing a 50% reduction compared to the original 50 µA specification. This improvement reduces standby power consumption in battery-powered or low-power applications.

Q: Can BU28SD2MG-MTR be used in non-automotive applications?

A: Yes. Automotive-grade qualification (AEC-Q100) indicates enhanced reliability and extended temperature testing. These parts are suitable for general industrial and commercial applications and provide additional performance margin compared to standard-grade alternatives.

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