MIC5319-2.5BD5 Equivalent & Substitute Parts

Part Overview

The MIC5319-2.5BD5 is a linear voltage regulator IC from Microchip Technology designed for positive fixed 2.5V output applications with 500mA current capacity in a TSOT-23-5 surface mount package. This part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. Substitute parts must maintain electrical compatibility across output voltage, current rating, dropout characteristics, and thermal performance parameters while accommodating modern component availability and compliance requirements.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.5V
Output Current	500mA
Input Voltage (Max)	5.5V
Dropout Voltage (Max)	0.4V @ 500mA
Quiescent Current	150 µA
PSRR	70dB ~ 60dB (1kHz ~ 10kHz)
Package Type	TSOT-23-5
Operating Temperature Range	-40°C ~ 125°C
Control Features	Enable
Protection Features	Over Current, Over Temperature

Substitute Part Grouping Explanation

Substitution eligibility for the MIC5319-2.5BD5 is determined by the following critical parameters:

Fixed output voltage of 2.5V
Output current capability of 500mA or greater
Maximum input voltage of 5.5V or higher
Surface mount TSOT-23-5 package compatibility
Enable control feature and over current/over temperature protection
Operating temperature range of -40°C to 125°C

The identified substitute parts RT9193-25GB and RT9193-25GJ5 maintain the same output voltage (2.5V), input voltage rating (5.5V), package type (TSOT-23-5), control features, and protection characteristics. However, these substitutes have a reduced output current rating of 300mA compared to the original 500mA specification. This reduction in current capacity represents a functional limitation that must be evaluated against specific application requirements.

Parameter Comparison

Parameter	MIC5319-2.5BD5	RT9193-25GB	RT9193-25GJ5
Manufacturer	Microchip Technology	Richtek USA Inc.	Richtek USA Inc.
Output Voltage (Fixed)	2.5V	2.5V	2.5V
Output Current	500mA	300mA	300mA
Input Voltage (Max)	5.5V	5.5V	5.5V
Quiescent Current	150 µA	130 µA	130 µA
PSRR	70dB ~ 60dB (1kHz ~ 10kHz)	70dB ~ 50dB (100Hz ~ 10kHz)	70dB ~ 50dB (100Hz ~ 10kHz)
Package Type	TSOT-23-5	SOT-23-5	TSOT-23-5
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Control Features	Enable	Enable	Enable
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Over Current, Over Temperature
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

RT9193-25GJ5 is the preferred substitute when TSOT-23-5 package matching is required. This part maintains exact package compatibility with the original MIC5319-2.5BD5, carries active product status ensuring long-term availability, and meets ROHS3 compliance requirements. The MSL-3 rating requires standard moisture control during storage and handling.

RT9193-25GB provides an alternative with SOT-23-5 package configuration. While functionally equivalent in electrical characteristics, this variant requires PCB layout verification to confirm mechanical compatibility with existing footprints designed for TSOT-23-5.

Both RT9193 variants operate at reduced output current (300mA versus 500mA). Selection of either substitute is valid only when application load current does not exceed 300mA. Applications requiring the full 500mA output capacity of the original part cannot use these substitutes without circuit redesign.

Frequently Asked Questions (FAQ)

Q: Can RT9193-25GJ5 directly replace MIC5319-2.5BD5 in existing designs?

A: Direct replacement is possible only if application load current remains below 300mA. The RT9193-25GJ5 maintains identical TSOT-23-5 package geometry, output voltage (2.5V), input voltage rating (5.5V), and control/protection features. If the original design draws more than 300mA, circuit modification is required.

Q: What is the difference between RT9193-25GB and RT9193-25GJ5?

A: Both parts are electrically identical with 2.5V output and 300mA current rating. The primary difference is package type: RT9193-25GB uses SOT-23-5 while RT9193-25GJ5 uses TSOT-23-5. For direct footprint compatibility with MIC5319-2.5BD5, RT9193-25GJ5 is the correct choice.

Q: Why is the output current lower in the substitute parts?

A: The RT9193 series is designed with a 300mA output specification, which is a fundamental characteristic of this regulator family. This is not a derating or limitation but rather the specified maximum output current for these devices.

Q: Are there compliance differences between the original and substitute parts?

A: Yes. The MIC5319-2.5BD5 is RoHS non-compliant, while both RT9193 variants meet ROHS3 compliance. The RT9193 parts also have MSL-3 moisture sensitivity rating (168 hours) compared to MSL-1 (unlimited) for the original part, requiring standard moisture control during storage.

Q: Can I use RT9193-25GB if my PCB is designed for TSOT-23-5?

A: No. RT9193-25GB uses SOT-23-5 package, which has different mechanical dimensions than TSOT-23-5. PCB footprint modification would be required. Use RT9193-25GJ5 for direct TSOT-23-5 compatibility.

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