S-T111B39MC-OGYTFG Equivalent & Substitute Parts

Part Overview

The S-T111B39MC-OGYTFG is a linear voltage regulator IC from ABLIC Inc. designed for positive fixed output regulation at 3.9V with 150mA output current in SOT-23-5 surface mount packaging. This part is classified as Not For New Designs, making identification of active equivalent alternatives essential for ongoing production and maintenance applications. Substitute parts must maintain identical electrical performance and mechanical compatibility while preferably offering active product status for long-term availability.

Key Parameters

Parameter	Value
Manufacturer	ABLIC Inc.
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.9V
Output Current	150mA
Input Voltage (Max)	6.5V
Voltage Dropout (Max)	0.26V @ 100mA
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-23-5
Operating Temperature	-40°C ~ 85°C (TA)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility is determined by the following critical parameters:

Output voltage fixed at 3.9V
Output current capability of 150mA
Maximum input voltage of 6.5V or greater
Surface mount packaging in SOT-23-5 or compatible footprint
Operating temperature range of -40°C to 85°C
Enable control feature and over current protection
ROHS3 compliance and MSL 1 rating

Substitute parts are grouped into two categories:

Category 1: ABLIC Inc. Series Variants — Parts S-1112B39MC-L6YTFU, S-1122B39MC-L8YTFU, S-T111B39MC-OGYTFU, and S-1167B39-M5T1U maintain identical electrical specifications and packaging. These parts differ only in series designation and product status, with S-1112, S-1122, and S-1167 offering Active status compared to the Not For New Designs status of the main part.

Category 2: Cross-Manufacturer Alternative — Part XC6504A391MR-G from Torex Semiconductor Ltd meets core functional requirements with identical output voltage and current ratings, though with minor variations in maximum input voltage (6V vs 6.5V) and dropout voltage characteristics (0.59V @ 150mA vs 0.26V @ 100mA).

Parameter Comparison

Parameter	S-T111B39MC-OGYTFG	S-1112B39MC-L6YTFU	S-1122B39MC-L8YTFU	S-1167B39-M5T1U	S-T111B39MC-OGYTFU	XC6504A391MR-G
Manufacturer	ABLIC Inc.	ABLIC Inc.	ABLIC Inc.	ABLIC Inc.	ABLIC Inc.	Torex Semiconductor Ltd
Product Status	Not For New Designs	Active	Active	Active	Active	Active
Output Voltage	3.9V	3.9V	3.9V	3.9V	3.9V	3.9V
Output Current	150mA	150mA	150mA	150mA	150mA	150mA
Input Voltage (Max)	6.5V	6.5V	6.5V	6.5V	6.5V	6V
Voltage Dropout (Max)	0.26V @ 100mA	0.26V @ 100mA	0.26V @ 100mA	0.21V @ 100mA	0.26V @ 100mA	0.59V @ 150mA
Quiescent Current (Iq)	1 µA	1 µA	1 µA	900 nA	1 µA	1.5 µA
Supply Current (Max)	90 µA	90 µA	90 µA	16 µA	90 µA	Not specified
PSRR	80dB (1kHz)	80dB (1kHz)	80dB (1kHz)	65dB (1kHz)	80dB (1kHz)	Not specified
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753
Supplier Device Package	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-23-5	SOT-25
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

ABLIC Inc. Series Variants (S-1112B39MC-L6YTFU, S-1122B39MC-L8YTFU, S-T111B39MC-OGYTFU, S-1167B39-M5T1U) are preferred substitutes due to Active product status, ensuring long-term availability and supply chain continuity. All four parts maintain identical electrical specifications to the main part with full parameter compatibility. S-1167B39-M5T1U offers enhanced performance characteristics including lower quiescent current (900 nA vs 1 µA), reduced supply current (16 µA vs 90 µA), and lower dropout voltage (0.21V @ 100mA vs 0.26V @ 100mA), making it suitable for power-sensitive applications. All ABLIC variants carry ROHS3 compliance and MSL 1 rating.

XC6504A391MR-G from Torex Semiconductor Ltd is a functional alternative with Active status and full ROHS3 compliance. This part maintains the 3.9V output voltage and 150mA current rating with identical operating temperature range. However, the maximum input voltage is reduced to 6V (versus 6.5V for ABLIC parts) and dropout voltage is significantly higher at 0.59V @ 150mA. The SOT-25 package differs from the SOT-23-5 footprint of the main part, requiring PCB layout verification. This substitute is suitable only when input voltage does not exceed 6V and higher dropout voltage is acceptable.

Frequently Asked Questions (FAQ)

Q: Can S-1167B39-M5T1U be used as a direct replacement for S-T111B39MC-OGYTFG?

A: Yes. Both parts share identical output voltage (3.9V), output current (150mA), input voltage maximum (6.5V), package type (SOT-23-5), and operating temperature range (-40°C to 85°C). S-1167B39-M5T1U offers superior performance with lower quiescent current and dropout voltage. No circuit modifications are required.

Q: What is the key difference between ABLIC series variants and the Torex XC6504A391MR-G?

A: ABLIC variants maintain all electrical specifications of the original part with identical input voltage maximum (6.5V) and dropout voltage characteristics. The Torex part has a reduced maximum input voltage (6V) and significantly higher dropout voltage (0.59V @ 150mA vs 0.26V @ 100mA). Additionally, the Torex part uses SOT-25 packaging instead of SOT-23-5, requiring PCB footprint verification.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts, including S-1112B39MC-L6YTFU, S-1122B39MC-L8YTFU, S-T111B39MC-OGYTFU, S-1167B39-M5T1U, and XC6504A391MR-G, are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: Why is the main part marked as Not For New Designs?

A: The S-T111B39MC-OGYTFG carries Not For New Designs status, indicating ABLIC Inc. has transitioned this part to end-of-life. Active alternatives within the same ABLIC series (S-1112, S-1122, S-T111 with OGYTFU suffix, and S-1167) provide equivalent functionality with confirmed long-term availability.

Q: Can XC6504A391MR-G be used in applications requiring 6.5V input?

A: No. The XC6504A391MR-G has a maximum input voltage of 6V. Applications requiring input voltages up to 6.5V must use ABLIC series variants (S-1112B39MC-L6YTFU, S-1122B39MC-L8YTFU, S-T111B39MC-OGYTFU, or S-1167B39-M5T1U).

Q: What is the impact of higher dropout voltage in the Torex part?

A: The XC6504A391MR-G exhibits 0.59V dropout at 150mA compared to 0.26V @ 100mA for ABLIC parts. This higher dropout voltage results in greater voltage loss across the regulator at full load, reducing the minimum input voltage required for stable regulation and increasing power dissipation. Applications with tight input voltage margins or thermal constraints should use ABLIC variants.

Q: Are there any package compatibility concerns with substitution?

A: ABLIC variants (S-1112B39MC-L6YTFU, S-1122B39MC-L8YTFU, S-T111B39MC-OGYTFU, S-1167B39-M5T1U) use identical SOT-23-5 packaging and are pin-compatible with the main part. The Torex XC6504A391MR-G uses SOT-25 packaging, which differs in pin count and footprint. PCB layout and schematic verification is required before substituting with the Torex part.

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