TCR3RM18A,LF Linear Voltage Regulator IC

Part Overview

The TCR3RM18A,LF is a linear voltage regulator IC manufactured by Toshiba Semiconductor and Storage, designed for positive fixed 1.8V output applications with 300mA current capacity in a 4-DFNC surface mount package. This component is classified as obsolete, necessitating identification of active substitute parts for new designs and ongoing production requirements. The part delivers regulated 1.8V output with integrated over-current and over-temperature protection features suitable for low-power digital and analog circuit applications.

Key Parameters

Parameter	Value
Manufacturer	Toshiba Semiconductor and Storage
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Fixed
Voltage - Output (Fixed)	1.8V
Voltage - Input (Max)	5.5V
Current - Output	300mA
Voltage Dropout (Max)	0.13V @ 300mA
Package / Case	4-XDFN Exposed Pad
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C
Protection Features	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the TCR3RM18A,LF is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Output voltage: 1.8V fixed
Output current capacity: 300mA
Maximum input voltage: 5.5V
Package type: 4-XDFN Exposed Pad (4-DFNC)
Mounting type: Surface Mount
Operating temperature range: -40°C ~ 85°C
Protection features: Over Current and Over Temperature protection
RoHS compliance: ROHS3 Compliant

The TCR3RM18A,LF(SE variant meets all mandatory parameters and qualifies as a direct substitute. This variant maintains identical electrical specifications while offering active product status and enhanced control features including current limit and enable functionality.

Parameter Comparison

Parameter	TCR3RM18A,LF (Main Part)	TCR3RM18A,LF(SE (Substitute)
Manufacturer	Toshiba Semiconductor and Storage	Toshiba Semiconductor and Storage
Series	TCR3RM	TCR3RM
Product Status	Obsolete	Active
Output Configuration	Positive	Positive
Output Type	Fixed	Fixed
Voltage - Output (Fixed)	1.8V	1.8V
Voltage - Input (Max)	5.5V	5.5V
Current - Output	300mA	300mA
Voltage Dropout (Max)	0.13V @ 300mA	0.22V @ 300mA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C
Package / Case	4-XDFN Exposed Pad	4-XDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature
RoHS Status	ROHS3 Compliant	ROHS3 Compliant
Packaging Format	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)

Engineering Selection Recommendations

The TCR3RM18A,LF(SE is the qualified substitute for the obsolete TCR3RM18A,LF. Both parts are manufactured by Toshiba Semiconductor and Storage and maintain identical core electrical specifications including 1.8V fixed output, 300mA current capacity, and 5.5V maximum input voltage. Both components are ROHS3 compliant and operate across the -40°C to 85°C temperature range.

The substitute part offers active product status, ensuring long-term availability and supply chain continuity. The TCR3RM18A,LF(SE includes additional control features (current limit and enable functionality) not specified in the original part, providing enhanced design flexibility without compromising backward compatibility.

The voltage dropout specification differs between the two parts (0.13V versus 0.22V at 300mA). This variance must be evaluated within the context of specific circuit design requirements. Applications with tight input-to-output voltage margins require verification that the higher dropout voltage of the substitute part remains within acceptable operating parameters.

Both parts utilize identical 4-XDFN Exposed Pad surface mount packaging. The primary difference lies in packaging format: the original part is supplied in Cut Tape format, while the substitute is supplied in Tape & Reel format. This distinction affects procurement and assembly processes but does not impact electrical or mechanical compatibility.

Frequently Asked Questions (FAQ)

Q: Can the TCR3RM18A,LF(SE directly replace the TCR3RM18A,LF in existing designs?

A: Yes. Both parts deliver identical 1.8V fixed output, 300mA current capacity, and operate across -40°C to 85°C. The package type (4-XDFN Exposed Pad) and mounting configuration are identical. The substitute part includes additional control features that do not interfere with basic regulator operation.

Q: What is the significance of the voltage dropout difference between the two parts?

A: The main part specifies 0.13V dropout at 300mA, while the substitute specifies 0.22V. This 0.09V difference affects the minimum input voltage required to maintain regulated output. Designs operating with input voltages near the 5.5V maximum must confirm that the higher dropout voltage of the substitute part remains compatible with circuit requirements.

Q: Are there packaging compatibility considerations?

A: Both parts use the 4-XDFN Exposed Pad surface mount package with identical pinout and footprint. The difference between Cut Tape and Tape & Reel packaging affects procurement and assembly handling but does not impact PCB layout or soldering procedures.

Q: Why is the original part listed as obsolete?

A: Product obsolescence indicates that Toshiba Semiconductor and Storage has discontinued manufacturing the TCR3RM18A,LF. The TCR3RM18A,LF(SE maintains active status, ensuring continued availability and manufacturing support.

Q: Are both parts RoHS compliant?

A: Yes. Both the TCR3RM18A,LF and TCR3RM18A,LF(SE are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.

Q: What additional features does the substitute part provide?

A: The TCR3RM18A,LF(SE includes current limit and enable control features. These features provide design flexibility for applications requiring dynamic output control or current management, while remaining fully compatible with designs that do not utilize these functions.

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