XC6221D18AMR-G Equivalent & Substitute Parts

Part Overview

The XC6221D18AMR-G is a linear voltage regulator IC manufactured by Torex Semiconductor Ltd, classified as a Power Management (PMIC) component. This device delivers a fixed positive output of 1.85V at 200mA with a maximum dropout voltage of 0.21V at 100mA. The regulator features an enable control function and over-current protection, operating across the industrial temperature range of -40°C to 85°C. The component is housed in a SOT-25 package (SC-74A, SOT-753) and is mounted as a surface-mount device. The XC6221D18AMR-G maintains active product status and holds ROHS3 compliance with unlimited moisture sensitivity rating (MSL 1). Equivalent substitute parts are identified when they satisfy the core electrical specifications and functional requirements while maintaining compatibility with the application circuit topology.

Substiute Parts

XC6221D18AMR-G

Torex Semiconductor LtdIn Stock: 983XC6221D18AMR-G Datasheet

Current PartRFQ

S-1315A1J-M5T1U3

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the XC6221D18AMR-G is determined by strict equivalence across the following critical parameters:

Fixed Output Voltage: The substitute must deliver 1.85V fixed output to maintain circuit voltage regulation requirements.

Output Current Rating: The substitute must support 200mA continuous output current to satisfy load requirements.

Input Voltage Tolerance: The substitute must accept the maximum input voltage specification of the application. The XC6221D18AMR-G accepts up to 6V input; substitutes with lower maximum input ratings require circuit redesign.

Dropout Voltage: The substitute's dropout voltage directly impacts minimum input voltage headroom. Lower dropout voltage provides operational margin; higher dropout voltage may restrict minimum input voltage operation.

Quiescent Current: Standby power consumption affects battery-powered or low-power applications. Substitutes with significantly different quiescent current values alter system power budget calculations.

PSRR (Power Supply Rejection Ratio): This parameter determines noise attenuation from the input supply. Lower PSRR values indicate reduced noise filtering capability.

Operating Temperature Range: The substitute must support the full -40°C to 85°C operating range to ensure reliability across environmental conditions.

Package and Mounting: The substitute must use compatible surface-mount packaging to ensure PCB layout compatibility and assembly process alignment.

Control and Protection Features: The substitute must include enable control and over-current protection to maintain functional equivalence.

Compliance Status: Both the main part and substitute must maintain active product status and ROHS3 compliance for procurement and regulatory requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection (XC6221D18AMR-G): Retain the XC6221D18AMR-G when the application operates with input voltages up to 6V and requires superior power supply rejection ratio (70dB). This device is preferred for noise-sensitive applications and provides the lowest dropout voltage specification (0.21V @ 100mA), maximizing operational margin with low input voltage supplies.

Substitute Selection (S-1315A1J-M5T1U3): The S-1315A1J-M5T1U3 from ABLIC Inc. serves as a parametric equivalent when the following conditions are satisfied:

1. Application input voltage does not exceed 5.5V maximum
2. Circuit design accommodates the higher dropout voltage of 0.486V @ 200mA
3. Reduced noise rejection (60dB PSRR) is acceptable for the application environment
4. Lower quiescent current (1µA versus 50µA) provides system power budget advantage
5. PCB layout supports SOT-23-5 package pinout compatibility with SC-74A footprint
6. Assembly process accommodates Cut Tape (CT) packaging format

Both devices maintain active product status, ROHS3 compliance, and unlimited moisture sensitivity rating (MSL 1), ensuring regulatory and procurement compatibility. The substitute part is suitable for cost optimization and supply chain diversification when electrical and thermal requirements align with the specified parameter constraints.

Frequently Asked Questions (FAQ)

Q: Can the S-1315A1J-M5T1U3 replace the XC6221D18AMR-G in all applications?

A: No. The substitute is compatible only when the application input voltage remains at or below 5.5V. The XC6221D18AMR-G accepts up to 6V input. Additionally, the substitute's higher dropout voltage (0.486V @ 200mA versus 0.21V @ 100mA) requires verification that the input-to-output voltage differential remains sufficient for proper regulation.

Q: What is the impact of the different dropout voltage specifications?

A: Dropout voltage determines the minimum input voltage required to maintain regulated output. The XC6221D18AMR-G requires a minimum input voltage of approximately 2.06V (1.85V output + 0.21V dropout @ 100mA). The S-1315A1J-M5T1U3 requires approximately 2.336V (1.85V output + 0.486V dropout @ 200mA). Applications with input voltages below 2.3V must use the XC6221D18AMR-G.

Q: How does the quiescent current difference affect system design?

A: The S-1315A1J-M5T1U3 draws only 1µA quiescent current compared to 50µA for the XC6221D18AMR-G. In battery-powered or always-on applications, this 49µA reduction directly decreases standby power consumption. Over extended periods, this difference becomes significant in low-power system designs.

Q: Are the package footprints identical?

A: Both devices use the SC-74A footprint classification, but the XC6221D18AMR-G is specified as SOT-25 while the S-1315A1J-M5T1U3 is SOT-23-5. Although both map to SC-74A, the pin configurations and internal layouts differ. PCB layout and schematic pin assignments must be verified before substitution to ensure correct signal routing and ground connections.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous carrier tape suitable for automated pick-and-place assembly equipment. Cut Tape (CT) packaging provides individual component segments cut from the carrier tape, typically used for manual assembly or lower-volume production. Assembly process compatibility and equipment capability determine which format is acceptable.

Q: Does the PSRR difference impact circuit performance?

A: PSRR (Power Supply Rejection Ratio) measures the regulator's ability to attenuate noise from the input supply. The XC6221D18AMR-G provides 70dB rejection at 1kHz, while the S-1315A1J-M5T1U3 provides 60dB. The 10dB difference represents approximately 3.16× better noise filtering in the main part. Applications with clean power supplies or moderate noise tolerance accept the substitute; noise-sensitive analog circuits may require the superior PSRR of the XC6221D18AMR-G.

Q: Are both devices compliant with current regulatory requirements?

A: Yes. Both the XC6221D18AMR-G and S-1315A1J-M5T1U3 maintain ROHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity rating (MSL 1). Both devices are classified under ECCN EAR99 and HTSUS 8542.39.0001. Regulatory and procurement requirements are satisfied by either device.

Q: What inventory considerations apply to substitution?

A: The XC6221D18AMR-G has 875 pieces in stock (Tape & Reel format), while the S-1315A1J-M5T1U3 has 894 pieces in stock (Cut Tape format). Inventory availability and packaging format compatibility with assembly operations determine practical substitution feasibility.