PAM3101DAB180 Equivalent & Substitute Parts

Part Overview

The PAM3101DAB180 is a linear voltage regulator IC from Diodes Incorporated designed for positive fixed 1.8V output at 300mA in a SOT-23-5 surface mount package. This device is classified as obsolete, making identification of functionally equivalent active alternatives essential for ongoing design support and production continuity. The part provides integrated over-current, over-temperature, and short-circuit protection with an enable control feature.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	1.8V
Output Current	300mA
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	1.1V @ 300mA
Quiescent Current	90 µA
Package Type	SOT-23-5 (SC-74A)
Operating Temperature Range	-40°C to 85°C
Protection Features	Over Current, Over Temperature, Short Circuit
Control Features	Enable
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the PAM3101DAB180 is based on the following critical parameters that must remain constant or compatible:

Fixed output voltage of 1.8V
Output current capability of 300mA minimum
SOT-23-5 package compatibility
Operating temperature range of -40°C to 85°C
RoHS3 compliance
Protection against over-current and over-temperature conditions

The AP2127K-1.8TRG1 qualifies as a direct substitute based on matching these core electrical and mechanical specifications. Both devices are positive fixed linear regulators with identical output voltage and current ratings in the same package footprint.

Parameter Comparison

Parameter	PAM3101DAB180	AP2127K-1.8TRG1	Notes
Manufacturer	Diodes Incorporated	Diodes Incorporated	Same manufacturer
Output Voltage	1.8V	1.8V	Identical
Output Current	300mA	300mA	Identical
Input Voltage (Max)	5.5V	6V	AP2127K-1.8TRG1 rated higher
Voltage Dropout (Max)	1.1V @ 300mA	0.7V @ 300mA	AP2127K-1.8TRG1 has lower dropout
Quiescent Current	90 µA	90 µA	Identical
PSRR	70dB ~ 65dB (100Hz ~ 1kHz)	68dB ~ 54dB (100Hz ~ 10kHz)	Different frequency ranges
Package	SOT-23-5	SOT-23-5	Identical footprint
Operating Temperature	-40°C to 85°C	-40°C to 85°C	Identical
Protection Features	OCP, OTP, SCP	OCP, OTP	PAM3101DAB180 includes short-circuit protection
Product Status	Obsolete	Active	AP2127K-1.8TRG1 is currently in production
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Both compliant
Packaging Format	Bulk	Tape & Reel (TR)	Different supply format

Engineering Selection Recommendations

The AP2127K-1.8TRG1 is the manufacturer-recommended substitute for the obsolete PAM3101DAB180. Both devices maintain ROHS3 compliance and REACH unaffected status, meeting regulatory requirements for current production environments.

The AP2127K-1.8TRG1 offers improved electrical performance with lower maximum dropout voltage (0.7V versus 1.1V at 300mA) and higher maximum input voltage rating (6V versus 5.5V). These enhancements provide greater design margin and efficiency in power conversion applications.

The primary design consideration is that the PAM3101DAB180 includes integrated short-circuit protection, while the AP2127K-1.8TRG1 provides over-current and over-temperature protection. Circuit designs relying on dedicated short-circuit protection should evaluate external protection requirements when transitioning to the substitute part.

Both devices are surface-mount components in identical SOT-23-5 packages, ensuring direct PCB footprint compatibility without layout modifications.

Frequently Asked Questions (FAQ)

Q: Can the AP2127K-1.8TRG1 replace the PAM3101DAB180 in existing designs?

A: Yes. Both devices provide 1.8V fixed output at 300mA in SOT-23-5 packages with matching operating temperature ranges and quiescent current specifications. The substitute part is electrically and mechanically compatible for direct replacement.

Q: What is the difference in dropout voltage between these parts?

A: The PAM3101DAB180 has a maximum dropout of 1.1V at 300mA, while the AP2127K-1.8TRG1 has a maximum dropout of 0.7V at 300mA. The lower dropout of the substitute part reduces power dissipation and improves efficiency in applications with limited input voltage headroom.

Q: Are there differences in protection features?

A: The PAM3101DAB180 includes over-current, over-temperature, and short-circuit protection. The AP2127K-1.8TRG1 provides over-current and over-temperature protection. Designs requiring short-circuit protection should implement external protection or verify that over-current protection is sufficient for the application.

Q: Do both parts meet current compliance standards?

A: Yes. Both the PAM3101DAB180 and AP2127K-1.8TRG1 are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.

Q: What is the packaging difference between these parts?

A: The PAM3101DAB180 is supplied in bulk packaging, while the AP2127K-1.8TRG1 is supplied in Tape & Reel (TR) format. Both use identical SOT-23-5 component packages suitable for automated assembly processes.

Q: Can the AP2127K-1.8TRG1 handle higher input voltages?

A: Yes. The AP2127K-1.8TRG1 is rated for maximum input voltage of 6V, compared to 5.5V for the PAM3101DAB180. This provides additional design margin in applications with variable input voltage sources.

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