ZXCL280H5TA Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The ZXCL280H5TA is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to deliver a fixed positive 2.8V output at 150mA in a compact SC-70-5 surface mount package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and production continuity. The regulator features enable control, over-current protection, and over-temperature protection, operating across the industrial temperature range of -40°C to 85°C.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Output Voltage (Fixed)	2.8V
Output Current	150mA
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.28V @ 100mA
Quiescent Current	50 µA
Package / Case	5-TSSOP, SC-70-5, SOT-353
Operating Temperature	-40°C ~ 85°C
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the ZXCL280H5TA is determined by the following critical parameters:

Output voltage matching at 2.8V fixed
Output current capability of 150mA minimum
Maximum input voltage of 5.5V or greater
Surface mount package compatibility (SC-70-5 / SOT-353)
Enable control feature
Over-current and over-temperature protection
Operating temperature range of -40°C to 85°C minimum

Substitute parts are grouped into two categories: parametric equivalents with identical electrical specifications and manufacturer-recommended alternatives with enhanced or comparable performance characteristics. All listed substitutes maintain functional compatibility within the specified electrical and thermal operating parameters.

Parameter Comparison

Part Number	Manufacturer	Output Voltage	Output Current	Input Voltage (Max)	Dropout Voltage	Quiescent Current	Operating Temp	Product Status	Package
ZXCL280H5TA	Diodes Incorporated	2.8V	150mA	5.5V	0.28V @ 100mA	50 µA	-40°C ~ 85°C	Obsolete	SC-70-5
ZXCL5213V28H5TA	Diodes Incorporated	2.8V	150mA	5.5V	0.28V @ 100mA	50 µA	-40°C ~ 85°C	Obsolete	SC-70-5
AP7115-28SEG-7	Diodes Incorporated	2.8V	150mA	5.5V	0.3V @ 150mA	80 µA	-40°C ~ 85°C	Active	SOT-353
ISL9003AIEJZ-T	Intersil	2.8V	150mA	6.5V	0.4V @ 150mA	40 µA	-40°C ~ 85°C	Active	SC-70-5
LP5951MGX-2.8/NOPB	Texas Instruments	2.8V	150mA	5.5V	0.35V @ 150mA	55 µA	-40°C ~ 125°C	Active	SC-70-5
TLV70028DCKR	Texas Instruments	2.8V	200mA	5.5V	0.25V @ 200mA	55 µA	-40°C ~ 125°C	Active	SC-70-5
TLV70028DCKT	Texas Instruments	2.8V	200mA	5.5V	0.25V @ 200mA	55 µA	-40°C ~ 125°C	Active	SC-70-5

Engineering Selection Recommendations

Primary Recommendation: AP7115-28SEG-7

The AP7115-28SEG-7 from Diodes Incorporated is the preferred parametric equivalent. It maintains identical output voltage and current specifications while offering active product status. This part is available in higher inventory quantities (3760 pcs) and is packaged in SOT-353, which is mechanically and electrically compatible with the SC-70-5 package footprint. The slightly elevated quiescent current (80 µA vs. 50 µA) and dropout voltage (0.3V vs. 0.28V) remain within acceptable design margins for most applications.

Secondary Recommendation: TLV70028DCKR or TLV70028DCKT

Texas Instruments TLV70028 series regulators provide enhanced performance with 200mA output current capability, extended operating temperature range to 125°C, and superior dropout voltage of 0.25V @ 200mA. These parts are actively manufactured with substantial inventory availability (20300 pcs for DCKR). The increased current capacity provides design margin for future requirements. Both DCKR (Tape & Reel) and DCKT (Tape & Reel) variants are functionally identical.

Alternative Recommendation: LP5951MGX-2.8/NOPB

The Texas Instruments LP5951MGX-2.8/NOPB offers active status with extended temperature range (-40°C to 125°C) and includes short-circuit protection. This part is suitable for applications requiring enhanced thermal performance or additional protection features.

Cross-Manufacturer Option: ISL9003AIEJZ-T

The Intersil ISL9003AIEJZ-T provides the highest input voltage tolerance (6.5V) and lowest quiescent current (40 µA), beneficial for battery-powered or low-power applications. This part includes soft-start and under-voltage lockout protection features.

All recommended substitutes maintain ROHS3 compliance and are available in active production status, ensuring long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can I directly replace ZXCL280H5TA with AP7115-28SEG-7 without PCB modifications?

A: Yes. Both parts use the SC-70-5 / SOT-353 package with identical pinout and electrical interface. No PCB layout changes are required. The electrical parameter differences (quiescent current and dropout voltage) are within typical design tolerances.

Q: What is the difference between TLV70028DCKR and TLV70028DCKT?

A: Both parts are functionally identical linear voltage regulators with 2.8V output and 200mA current capability. The primary difference is packaging format: DCKR is supplied in Tape & Reel format, while DCKT is also supplied in Tape & Reel. Selection depends on procurement and assembly requirements.

Q: Why does the RT9198-28GU5R appear in the substitute list but not in the main comparison table?

A: The RT9198-28GU5R is listed as a substitute option due to its 2.8V output and SC-70-5 package compatibility. However, it delivers 300mA output current, which exceeds the ZXCL280H5TA specification. This part is suitable only for applications requiring higher current capacity and should not be used as a direct drop-in replacement without circuit verification.

Q: Are there any temperature range limitations when substituting with TLV70028 series?

A: No. The TLV70028 series extends the operating temperature range to -40°C to 125°C, which encompasses and exceeds the original ZXCL280H5TA range of -40°C to 85°C. This provides additional thermal margin for demanding applications.

Q: What is the significance of the ISL9003AIEJZ-T higher input voltage rating of 6.5V?

A: The ISL9003AIEJZ-T accepts input voltages up to 6.5V compared to 5.5V for the original part. This provides additional design flexibility for applications with variable input supplies or higher tolerance input voltage specifications. The part remains fully functional at the original 5.5V maximum input.

Q: Can I use LP5951MGX-2.5/NOPB as a substitute for the 2.8V output requirement?

A: No. The LP5951MGX-2.5/NOPB is configured for 2.5V fixed output and is not suitable for applications requiring 2.8V regulation. Use only LP5951MGX-2.8/NOPB for 2.8V output applications.

Q: What is the MSL (Moisture Sensitivity Level) consideration for these substitutes?

A: The original ZXCL280H5TA has MSL 1 (unlimited moisture exposure). Most active substitutes (AP7115-28SEG-7, TLV70028 series, LP5951 series) maintain MSL 1 or equivalent ratings. The ISL9003AIEJZ-T does not specify MSL in the provided data. Verify MSL requirements for your specific assembly and storage conditions.

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