IXD3221A09AMR Equivalent & Substitute Parts

Part Overview

The IXD3221A09AMR is a buck regulator positive output step-down DC-DC controller IC manufactured by Zilog in SOT-25 packaging. This device functions as a transistor driver for step-down topology applications with a single output phase and 1MHz switching frequency. The part is active and in production with 684 units currently in stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative sourcing reduces lead times, or when design flexibility requires selection from multiple qualified manufacturers. The XC9220 and XC9221 series from Torex Semiconductor Ltd provide parametric equivalence across critical electrical and mechanical specifications.

Key Parameters

Parameter	Value
Manufacturer Part Number	IXD3221A09AMR
Manufacturer	Zilog
Category	Power Management (PMIC)
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-25
Output Type	Transistor Driver
Function	Step-Down
Output Configuration	Positive
Topology	Buck
Number of Outputs	1
Output Phases	1
Voltage - Supply (Vcc/Vdd)	2.8V ~ 16V
Frequency - Switching	1MHz
Duty Cycle (Max)	100%
Synchronous Rectifier	No
Clock Sync	No
Control Features	Enable, Soft Start
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)
REACH Status	REACH Unaffected
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the IXD3221A09AMR is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

Output Type: Transistor Driver
Function: Step-Down
Output Configuration: Positive
Topology: Buck
Number of Outputs: 1
Output Phases: 1
Voltage - Supply (Vcc/Vdd): 2.8V ~ 16V
Duty Cycle (Max): 100%
Synchronous Rectifier: No
Clock Sync: No
Operating Temperature: -40°C ~ 85°C (TA)
Package / Case: SC-74A, SOT-753
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)
REACH Status: REACH Unaffected
Product Status: Active

Variable Parameters (Allowed Differences):

Frequency - Switching: 300kHz, 500kHz, or 1MHz
Control Features: Enable/Soft Start combinations
Manufacturer: Torex Semiconductor Ltd (XC9220/XC9221 series)
Supplier Device Package: SOT-25-5 (equivalent to SOT-25)

All substitute parts listed below meet these criteria and are qualified for direct replacement in applications where the IXD3221A09AMR is specified.

Parameter Comparison

Part Number	Manufacturer	Switching Frequency	Control Features	Inventory (Pcs)	Packaging
IXD3221A09AMR	Zilog	1MHz	Enable, Soft Start	684	SOT-25
XC9220A093MR-G	Torex Semiconductor Ltd	300kHz	Enable, Soft Start	6200	SOT-25-5 (TR)
XC9220A09AMR-G	Torex Semiconductor Ltd	1MHz	Enable, Soft Start	3200	SOT-25-5 (TR)
XC9220B095MR-G	Torex Semiconductor Ltd	500kHz	Enable, Soft Start	1107	SOT-25-5 (TR)
XC9220C095MR-G	Torex Semiconductor Ltd	500kHz	Enable, Soft Start	952	SOT-25-5 (TR)
XC9220C09AMR-G	Torex Semiconductor Ltd	1MHz	Enable, Soft Start	1152	SOT-25-5 (TR)
XC9220D093MR-G	Torex Semiconductor Ltd	300kHz	Enable, Soft Start	757	SOT-25-5 (TR)
XC9220D095MR-G	Torex Semiconductor Ltd	500kHz	Enable, Soft Start	815	SOT-25-5 (TR)
XC9221A093MR-G	Torex Semiconductor Ltd	300kHz	Enable, Soft Start	961	SOT-25-5 (TR)
XC9221A095MR-G	Torex Semiconductor Ltd	500kHz	Enable, Soft Start	19049	SOT-25-5 (TR)
XC9221A09AMR-G	Torex Semiconductor Ltd	1MHz	Enable, Soft Start	809	SOT-25-5 (TR)

Engineering Selection Recommendations

All listed substitute parts are active products with ROHS3 compliance, REACH unaffected status, and MSL 1 rating. Selection among equivalent parts should be based on:

Switching Frequency Alignment: The IXD3221A09AMR operates at 1MHz. Direct frequency-matched substitutes are XC9220A09AMR-G, XC9220C09AMR-G, and XC9221A09AMR-G. These maintain identical switching frequency characteristics for applications where frequency stability is critical.

Inventory Availability: XC9221A095MR-G offers the highest stock level at 19,049 units, followed by XC9220A093MR-G at 6,200 units. These options provide supply chain flexibility for high-volume requirements.

Manufacturer Qualification: Both Zilog (primary) and Torex Semiconductor Ltd (substitute) parts meet identical electrical, thermal, and compliance specifications. Torex XC9220 and XC9221 series parts are fully qualified alternatives across all critical parameters.

Package Compatibility: All parts use SC-74A/SOT-753 physical package with SOT-25 or SOT-25-5 supplier designations. PCB footprints are mechanically compatible.

Frequently Asked Questions (FAQ)

Q: Can XC9220 series parts replace the IXD3221A09AMR in existing designs?

A: Yes. XC9220 series parts (XC9220A09AMR-G, XC9220C09AMR-G, XC9220D095MR-G, and others) meet all mandatory electrical and mechanical parameters. Pin-to-pin compatibility and functional equivalence are confirmed across the buck regulator controller topology, output configuration, voltage range, and control features.

Q: What is the difference between XC9220 and XC9221 series?

A: Both series are parametric equivalents to the IXD3221A09AMR. The primary distinction is manufacturer internal design variation. Both maintain identical supply voltage range (2.8V ~ 16V), output topology (positive buck), duty cycle (100%), and operating temperature (-40°C ~ 85°C). Selection between series is based on inventory availability and switching frequency requirements.

Q: Does switching frequency affect substitution eligibility?

A: Switching frequency is a variable parameter. The IXD3221A09AMR operates at 1MHz. Substitute parts are available at 300kHz, 500kHz, and 1MHz. For applications where switching frequency is non-critical, any frequency variant qualifies. For frequency-sensitive designs, select 1MHz variants (XC9220A09AMR-G, XC9220C09AMR-G, XC9221A09AMR-G).

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and REACH unaffected status, matching the primary part's regulatory qualification.

Q: What is the significance of the SOT-25-5 package designation on Torex parts?

A: SOT-25-5 is the Torex supplier designation for the SC-74A/SOT-753 physical package. This is mechanically and electrically equivalent to the SOT-25 designation used by Zilog. PCB footprints are identical, and no layout modifications are required for substitution.

Q: Can I mix IXD3221A09AMR and XC9220/XC9221 parts in the same production run?

A: Yes. All parts are active products with identical electrical specifications, compliance certifications, and package compatibility. Mixed sourcing is supported for supply chain continuity.

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