AP7361-18D-13 Equivalent & Substitute Parts

Part Overview

The AP7361-18D-13 is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to deliver a fixed 1.8V output at 1A maximum current. This positive fixed output regulator operates across an input voltage range up to 6V with a maximum dropout voltage of 0.7V at full load. The device is housed in a TO-252-3 (DPAK) surface mount package and is actively produced with full RoHS3 compliance.

Substitute parts are identified when equivalent electrical performance can be maintained within the specified parameter tolerances while maintaining mechanical compatibility and regulatory compliance. Alternative sources may be required due to supply availability, lead time considerations, or design optimization for specific application requirements.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	1.8	V
Maximum Output Current	1	A
Maximum Input Voltage	6	V
Maximum Dropout Voltage	0.7	V @ 1A
Quiescent Current	90	µA
Package Type	TO-252-3 (DPAK)	—
Operating Temperature Range	-40 to 85	°C
Protection Features	Over Current, Over Temperature, Short Circuit	—

Substitute Part Grouping Explanation

Substitution eligibility for the AP7361-18D-13 is determined by the following critical parameters:

Output Voltage Match: Fixed 1.8V output is mandatory for direct substitution
Package Compatibility: TO-252-3 (DPAK, SC-63) surface mount package required
Output Current Capability: Minimum 1A output current required to support full load specifications
Input Voltage Range: Maximum input voltage of 5.5V or higher to accommodate 6V input specification
Regulatory Compliance: RoHS3 compliance and REACH unaffected status required
Protection Features: Over current and over temperature protection required as minimum

The BD18KA5FP-E2 from Rohm Semiconductor meets the fixed 1.8V output requirement and shares the identical TO-252-3 package footprint. However, this substitute has a reduced maximum output current rating of 500mA, which is below the 1A requirement of the primary part. This substitution is therefore valid only for applications requiring 500mA or less output current.

Parameter Comparison

Parameter	AP7361-18D-13 (Diodes)	BD18KA5FP-E2 (Rohm)	Compatibility Notes
Manufacturer	Diodes Incorporated	Rohm Semiconductor	Different manufacturers
Output Voltage	1.8V (Fixed)	1.8V (Fixed)	Matched
Maximum Output Current	1A	500mA	Substitute rated lower
Maximum Input Voltage	6V	5.5V	Substitute rated lower
Dropout Voltage (Max)	0.7V @ 1A	0.2V @ 200mA	Different load conditions
Quiescent Current	90µA	550µA	Substitute draws higher standby current
Package	TO-252-3 (DPAK)	TO-252-3 (DPAK)	Footprint compatible
Operating Temperature	-40 to 85°C	-40 to 105°C	Substitute rated higher
Protection Features	OCP, OTP, SCP	OCP, OTP, Soft Start	Both include core protections
RoHS3 Compliance	Yes	Yes	Both compliant
REACH Status	Unaffected	Unaffected	Both unaffected

Engineering Selection Recommendations

Primary Part (AP7361-18D-13): Select this Diodes Incorporated regulator for applications requiring the full 1A output current specification. This part maintains active production status with confirmed inventory availability and meets all RoHS3 and REACH compliance requirements.

Substitute Part (BD18KA5FP-E2): The Rohm Semiconductor BD18KA5FP-E2 is suitable only for applications with output current requirements of 500mA or less. This substitute shares identical package footprint and fixed 1.8V output voltage. The substitute exhibits lower dropout voltage at reduced load conditions and extended operating temperature range to 105°C. However, the reduced maximum input voltage (5.5V vs 6V) and higher quiescent current (550µA vs 90µA) must be evaluated against specific application requirements.

Both parts maintain active product status and full regulatory compliance. Selection between primary and substitute should be based on actual application current requirements and input voltage constraints.

Frequently Asked Questions (FAQ)

Q: Can BD18KA5FP-E2 be used as a direct replacement for AP7361-18D-13?

A: Direct replacement is possible only if the application requires 500mA or less output current. The BD18KA5FP-E2 is rated for maximum 500mA output, while the AP7361-18D-13 is rated for 1A. Both parts share the TO-252-3 package footprint and deliver fixed 1.8V output, making them mechanically and electrically compatible within the substitute's current rating limits.

Q: What is the impact of the lower maximum input voltage on the BD18KA5FP-E2?

A: The BD18KA5FP-E2 has a maximum input voltage rating of 5.5V compared to 6V for the AP7361-18D-13. Applications with input voltages exceeding 5.5V must use the primary part. Applications with input voltages at or below 5.5V can safely use the substitute.

Q: How does the higher quiescent current of BD18KA5FP-E2 affect battery-powered applications?

A: The BD18KA5FP-E2 draws 550µA quiescent current versus 90µA for the AP7361-18D-13. In battery-powered or low-power standby applications, this 460µA difference may result in measurable power consumption increase during idle periods. The primary part is preferred for ultra-low-power designs.

Q: Are both parts suitable for the full -40°C to 85°C operating range?

A: Yes. The AP7361-18D-13 is rated -40°C to 85°C. The BD18KA5FP-E2 is rated -40°C to 105°C, providing extended high-temperature capability. Both parts operate within the standard -40°C to 85°C range.

Q: Do package dimensions differ between these parts?

A: No. Both the AP7361-18D-13 and BD18KA5FP-E2 use the TO-252-3 (DPAK, SC-63) package. PCB footprints are identical, allowing direct physical replacement without layout modifications.

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