XC6221B18AMR-G Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The XC6221B18AMR-G is an active linear voltage regulator manufactured by Torex Semiconductor Ltd, classified as a Power Management Integrated Circuit (PMIC). This device delivers a fixed positive output of 1.85V at 200mA with a maximum input voltage of 6V and is packaged in SOT-25 surface mount configuration. The part is currently in active production status with 893 units in stock inventory.

Linear voltage regulators of this specification are essential in applications requiring low-noise, low-dropout power conversion for microcontroller power supplies, sensor circuits, and auxiliary power rails. Equivalent and substitute parts are identified when component availability is constrained, supply chain disruptions occur, or design flexibility is required for multi-source procurement strategies.

Substiute Parts

XC6221B18AMR-G

Torex Semiconductor LtdIn Stock: 903XC6221B18AMR-G Datasheet

Current PartRFQ

S-1315A1J-M5T1U3

ABLIC Inc.In Stock: 992S-1315A1J-M5T1U3 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the XC6221B18AMR-G is determined by strict alignment of the following critical parameters:

Fixed Output Voltage: 1.85V (non-negotiable)

Output Current Rating: 200mA minimum (substitute must meet or exceed)

Input Voltage Range: Maximum input voltage must accommodate 6V operation

Voltage Dropout: Substitute dropout performance must be compatible with system design margins

Output Configuration: Positive fixed output only

Number of Regulators: Single regulator per package

Control Features: Enable function required

Protection Features: Over-current protection required

Operating Temperature Range: -40°C to 85°C minimum

Package Compatibility: Surface mount, SOT-25 or equivalent pinout-compatible package

Regulatory Compliance: RoHS3 compliant, REACH unaffected status

The S-1315A1J-M5T1U3 manufactured by ABLIC Inc. qualifies as a parametric equivalent based on matching output voltage, output current, temperature range, control features, protection features, and regulatory compliance status. Package differences (SOT-23-5 vs. SOT-25) require physical verification of PCB footprint compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (XC6221B18AMR-G): Use the original Torex part when supply is available. This device offers superior PSRR performance (70dB vs. 60dB) and lower dropout voltage (0.21V @ 100mA vs. 0.486V @ 200mA), providing better noise immunity and wider input voltage margin. Both parts maintain identical RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute Selection (S-1315A1J-M5T1U3): The ABLIC S-1315A1J-M5T1U3 is acceptable as a substitute when the Torex part is unavailable, subject to the following conditions:

1. System input voltage must not exceed 5.5V (vs. 6V maximum for main part)
2. Application must tolerate higher dropout voltage (0.486V @ 200mA)
3. PCB footprint must accommodate SOT-23-5 package geometry
4. Noise-sensitive circuits should be evaluated; PSRR is 10dB lower

Both parts are active production items with full RoHS3 compliance and unlimited moisture sensitivity rating, suitable for industrial and commercial applications across the -40°C to 85°C temperature range.

Frequently Asked Questions (FAQ)

Q: Can the S-1315A1J-M5T1U3 be used as a direct drop-in replacement for the XC6221B18AMR-G?

A: Electrical substitution is valid provided system input voltage remains below 5.5V and the higher dropout voltage (0.486V @ 200mA) is acceptable. Physical substitution requires PCB footprint verification, as SOT-25 and SOT-23-5 packages have different pin configurations despite both using SC-74A designation.

Q: What is the impact of the lower maximum input voltage (5.5V vs. 6V) on the substitute part?

A: The S-1315A1J-M5T1U3 has a 0.5V lower maximum input rating. If your system input voltage is 5.5V or below, there is no impact. If your system input approaches 6V, the substitute part cannot be used without circuit redesign to limit input voltage.

Q: Why does the substitute part have higher dropout voltage?

A: Dropout voltage is determined by the internal pass transistor design and is a characteristic difference between manufacturers. The S-1315A1J-M5T1U3 exhibits 0.486V dropout at full 200mA load versus 0.21V for the XC6221B18AMR-G. This affects the minimum input voltage required to maintain regulated output.

Q: Are there package compatibility issues between SOT-25 and SOT-23-5?

A: Both packages are 5-pin surface mount devices with SC-74A body dimensions, but pin assignments differ. Physical footprint compatibility cannot be assumed. PCB layout must be verified against each manufacturer's datasheet pinout diagram before substitution.

Q: How does the lower quiescent current of the substitute part affect system design?

A: The S-1315A1J-M5T1U3 draws only 1µA quiescent current compared to 50µA for the XC6221B18AMR-G. This 49µA difference is beneficial in battery-powered or ultra-low-power applications, reducing standby power consumption.

Q: What is the significance of the 10dB PSRR difference?

A: PSRR (Power Supply Rejection Ratio) measures noise attenuation from the input supply. The XC6221B18AMR-G provides 70dB rejection versus 60dB for the substitute. In noise-sensitive analog circuits (audio, precision measurement), the main part offers superior performance. For digital logic supply, the difference is typically negligible.

Q: Are both parts suitable for the same temperature range applications?

A: Yes. Both parts operate across -40°C to 85°C, meeting industrial and commercial temperature specifications identically.

Q: Do both parts have identical regulatory compliance?

A: Yes. Both are RoHS3 compliant, REACH unaffected, with MSL rating of 1 (unlimited moisture sensitivity). Both carry EAR99 ECCN classification and identical HTSUS code 8542.39.0001.