TCR3RM29A,LF Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The TCR3RM29A,LF is a linear voltage regulator IC manufactured by Toshiba Semiconductor and Storage, classified as a Power Management (PMIC) component. This device functions as a positive fixed output regulator delivering 300mA at 2.9V with a maximum dropout voltage of 0.13V at full load current. The part is currently listed as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and production requirements. The TCR3RM29A,LF is packaged in a 4-DFNC (1x1) surface mount configuration and is ROHS3 compliant with unlimited moisture sensitivity rating.

Key Parameters

Parameter	Value	Unit
Output Voltage (Fixed)	2.9	V
Output Current	300	mA
Input Voltage (Maximum)	5.5	V
Dropout Voltage (Maximum)	0.13	V @ 300mA
Output Configuration	Positive Fixed	—
Number of Regulators	1	—
Operating Temperature Range	-40 to 85	°C
Package Type	4-XDFN Exposed Pad	—
Protection Features	Over Current, Over Temperature	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the TCR3RM29A,LF is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Output voltage: 2.9V fixed
Output current capability: 300mA minimum
Input voltage maximum: 5.5V
Package type: 4-XDFN Exposed Pad (4-DFNC 1x1)
Output configuration: Positive fixed
Number of regulators: Single output
Operating temperature range: -40°C to 85°C minimum
Protection features: Over current and over temperature protection

Acceptable Variation Parameters:

Dropout voltage: Substitute parts may have dropout voltage up to 0.15V at 300mA (compared to 0.13V maximum for the main part)
Quiescent current: Additional specifications in substitute parts do not disqualify equivalence
Control features: Enhanced features such as current limit and enable functions are acceptable additions
Packaging format: Cut Tape (CT) and Digi-Reel® may be substituted with Tape & Reel (TR) format

The TCR3RM29A,LF(SE variant meets all substitution criteria and is classified as an equivalent part.

Parameter Comparison

Parameter	TCR3RM29A,LF (Main Part)	TCR3RM29A,LF(SE (Substitute)	Match Status
Manufacturer	Toshiba Semiconductor and Storage	Toshiba Semiconductor and Storage	Identical
Series	TCR3RM	TCR3RM	Identical
Output Voltage (Fixed)	2.9V	2.9V	Identical
Output Current	300mA	300mA	Identical
Input Voltage (Maximum)	5.5V	5.5V	Identical
Dropout Voltage (Maximum)	0.13V @ 300mA	0.15V @ 300mA	Compatible
Output Configuration	Positive Fixed	Positive Fixed	Identical
Number of Regulators	1	1	Identical
Operating Temperature	-40°C to 85°C	-40°C to 85°C	Identical
Package / Case	4-XDFN Exposed Pad	4-XDFN Exposed Pad	Identical
Supplier Device Package	4-DFNC (1x1)	4-DFNC (1x1)	Identical
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	Identical
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Identical
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	Identical
Product Status	Obsolete	Active	Substitute is Active
Packaging Format	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)	Compatible

Engineering Selection Recommendations

The TCR3RM29A,LF(SE is the direct equivalent substitute for the obsolete TCR3RM29A,LF. Selection of the substitute part is based on the following engineering criteria:

Product Status Consideration: The main part TCR3RM29A,LF carries an obsolete status, while the substitute TCR3RM29A,LF(SE maintains active product status with Toshiba Semiconductor and Storage. This ensures continued availability and manufacturing support for new production runs and design revisions.

Electrical Equivalence: All critical electrical parameters match identically between the main part and substitute, including output voltage (2.9V), output current (300mA), input voltage maximum (5.5V), and operating temperature range (-40°C to 85°C). The dropout voltage specification of the substitute (0.15V @ 300mA) is within acceptable tolerance relative to the main part (0.13V @ 300mA), representing a 0.02V variance that does not impact circuit performance in standard linear regulator applications.

Compliance and Certification: Both parts maintain ROHS3 compliance and identical moisture sensitivity ratings (MSL 1, Unlimited). The substitute part carries REACH Unaffected status, providing additional regulatory assurance for international applications.

Packaging Compatibility: Both parts utilize the identical 4-XDFN Exposed Pad package in 4-DFNC (1x1) configuration, ensuring direct PCB footprint compatibility. The packaging format difference (Cut Tape & Digi-Reel® versus Tape & Reel) does not affect component functionality or board-level integration.

Enhanced Features: The substitute part includes additional control features (Current Limit, Enable) and quiescent current specification (12 µA) that provide design flexibility without requiring circuit modifications. These features are backward compatible with applications designed for the main part.

Frequently Asked Questions (FAQ)

Q: Can the TCR3RM29A,LF(SE be used as a direct replacement for the TCR3RM29A,LF in existing designs?

A: Yes. The TCR3RM29A,LF(SE is a direct equivalent substitute. All critical electrical parameters (output voltage, output current, input voltage, operating temperature range) are identical. The package footprint (4-XDFN Exposed Pad, 4-DFNC 1x1) is identical, enabling direct PCB substitution without layout modifications.

Q: What is the significance of the dropout voltage difference (0.13V versus 0.15V)?

A: The substitute part has a maximum dropout voltage of 0.15V at 300mA, compared to 0.13V for the main part. This 0.02V difference is within acceptable tolerance for linear regulator applications and does not affect circuit performance in standard configurations. Both values ensure proper regulation across the specified input voltage range (up to 5.5V).

Q: Are there any compatibility issues with the packaging format change from Cut Tape to Tape & Reel?

A: No compatibility issues exist. The packaging format difference (Cut Tape & Digi-Reel® versus Tape & Reel) affects only the supply and handling method, not the component itself. The physical package (4-XDFN Exposed Pad) and pin configuration remain identical, ensuring seamless integration into existing assembly processes.

Q: Why is the main part listed as obsolete while the substitute is active?

A: The TCR3RM29A,LF is classified as obsolete by Toshiba Semiconductor and Storage, indicating discontinued production. The TCR3RM29A,LF(SE maintains active status with ongoing manufacturing support. For new designs and production continuity, the active substitute part is the appropriate selection.

Q: Do the additional control features in the substitute part (Current Limit, Enable) require circuit modifications?

A: No. The additional control features in the TCR3RM29A,LF(SE are backward compatible with designs created for the main part. These features are optional enhancements that do not require circuit modifications. Existing designs function identically with the substitute part.

Q: Are both parts ROHS3 compliant?

A: Yes. Both the TCR3RM29A,LF and TCR3RM29A,LF(SE are ROHS3 compliant with identical moisture sensitivity ratings (MSL 1, Unlimited). The substitute part additionally carries REACH Unaffected status.

Q: What is the quiescent current specification for the substitute part?

A: The TCR3RM29A,LF(SE has a quiescent current (Iq) specification of 12 µA. This specification was not provided for the main part but represents the standby current draw of the regulator and is typical for this device class.

Q: Can the substitute part handle the same maximum input voltage (5.5V)?

A: Yes. Both parts have identical maximum input voltage specifications of 5.5V, ensuring equivalent performance across the full input voltage range.

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