MIC5319-3.3BML-TR Equivalent & Substitute Parts

Part Overview

The MIC5319-3.3BML-TR is a linear voltage regulator IC from Microchip Technology designed for positive fixed 3.3V output applications with 500mA current capacity. This Surface Mount device in 6-TMLF® (2x2) package integrates enable control and protection features including over-current and over-temperature safeguards. The part is currently discontinued at DiGi Electronics, making identification of equivalent substitute parts essential for ongoing production and maintenance applications.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	3.3V
Output Current	500mA
Input Voltage (Max)	5.5V
Voltage Dropout (Max)	0.4V @ 500mA
Quiescent Current	150 µA
PSRR	70dB ~ 60dB (1kHz ~ 10kHz)
Package Type	6-VDFN Exposed Pad, 6-TMLF® (2x2)
Operating Temperature Range	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature
Control Features	Enable

Substitute Part Grouping Explanation

Substitution for the MIC5319-3.3BML-TR is determined by strict electrical and mechanical parameter matching within the MIC5319 series. The primary substitute, MIC5319-3.3YML-TR, maintains identical electrical specifications across all critical parameters: fixed 3.3V output, 500mA current capacity, 5.5V maximum input voltage, 0.4V dropout voltage, 150 µA quiescent current, and identical PSRR characteristics. Both parts feature the same 6-TMLF® (2x2) package configuration, enable control, and dual protection mechanisms (over-current and over-temperature).

The key differentiator between these parts is packaging format: the MIC5319-3.3BML-TR is supplied in Tape & Reel (TR) format, while the MIC5319-3.3YML-TR is available in Cut Tape (CT) & Digi-Reel® format. This distinction affects supply chain availability and procurement quantities but does not alter electrical or mechanical compatibility.

Parameter Comparison

Parameter	MIC5319-3.3BML-TR	MIC5319-3.3YML-TR
Manufacturer	Microchip Technology	Microchip Technology
Output Voltage (Fixed)	3.3V	3.3V
Output Current	500mA	500mA
Input Voltage (Max)	5.5V	5.5V
Voltage Dropout (Max)	0.4V @ 500mA	0.4V @ 500mA
Quiescent Current	150 µA	150 µA
PSRR	70dB ~ 60dB (1kHz ~ 10kHz)	70dB ~ 60dB (1kHz ~ 10kHz)
Package / Case	6-VDFN Exposed Pad, 6-TMLF® (2x2)	6-VDFN Exposed Pad, 6-TMLF® (2x2)
Operating Temperature Range	-40°C ~ 125°C	-40°C ~ 125°C
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature
Control Features	Enable	Enable
Packaging Format	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®
Product Status	Discontinued at DiGi Electronics	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

The MIC5319-3.3YML-TR serves as the direct substitute for the discontinued MIC5319-3.3BML-TR. Selection of this alternative is supported by three primary factors:

Product Status: The MIC5319-3.3YML-TR maintains Active status, ensuring continued availability and supply chain reliability compared to the discontinued MIC5319-3.3BML-TR.

Regulatory Compliance: The MIC5319-3.3YML-TR is ROHS3 Compliant, meeting current environmental and regulatory requirements. The original part is RoHS non-compliant, making the substitute preferable for new designs and applications subject to RoHS directives.

Electrical Equivalence: Complete parameter matching across output voltage, current capacity, input voltage range, dropout characteristics, quiescent current, PSRR, protection features, and operating temperature range ensures direct functional substitution without circuit redesign.

Packaging Compatibility: Both parts utilize identical 6-TMLF® (2x2) package configuration and pin assignment, enabling direct PCB-level replacement. The packaging format difference (Tape & Reel versus Cut Tape & Digi-Reel®) affects procurement and handling but not electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can MIC5319-3.3YML-TR replace MIC5319-3.3BML-TR in existing designs?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters. The 6-TMLF® (2x2) package pinout and electrical characteristics are equivalent, enabling direct substitution on existing PCBs without circuit modification.

Q: What is the difference between Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel® packaging?

A: These are supply format variations only. Tape & Reel packaging supplies components in continuous tape format for automated pick-and-place assembly. Cut Tape & Digi-Reel® format provides components in cut tape segments on reels. The physical component and its electrical performance remain identical. Selection depends on assembly equipment compatibility and procurement volume requirements.

Q: Are there any compliance differences between these parts?

A: Yes. The MIC5319-3.3YML-TR is ROHS3 Compliant, while the MIC5319-3.3BML-TR is RoHS non-compliant. For applications subject to RoHS directives or environmental regulations, the MIC5319-3.3YML-TR is the required choice.

Q: Do both parts have identical protection features?

A: Yes. Both the MIC5319-3.3BML-TR and MIC5319-3.3YML-TR include over-current and over-temperature protection, plus enable control functionality. Protection performance and thresholds are identical.

Q: What is the PSRR specification and is it identical between parts?

A: PSRR (Power Supply Rejection Ratio) measures the regulator's ability to reject power supply noise. Both parts specify 70dB ~ 60dB across the 1kHz ~ 10kHz frequency range, indicating identical noise rejection performance.

Q: Can these parts be used interchangeably in high-volume production?

A: Yes, with supply chain consideration. The MIC5319-3.3YML-TR is currently Active with higher inventory availability (23,900 Pcs), while the MIC5319-3.3BML-TR is discontinued. For ongoing production, the MIC5319-3.3YML-TR is the appropriate selection.

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