AP9101CK-AITRG1 Equivalent & Substitute Parts

Part Overview

The AP9101CK-AITRG1 is a single-cell lithium ion/polymer battery protection IC manufactured by Diodes Incorporated in SOT-25 surface mount packaging. This active product provides over-current and over-voltage fault protection for single-cell battery applications. The part is supplied in Tape & Reel (TR) packaging with ROHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when design flexibility permits selection from functionally identical variants within the same product family.

Key Parameters

Parameter	Value
Manufacturer	Diodes Incorporated
Category	Power Management (PMIC)
Function	Battery Protection
Battery Chemistry	Lithium Ion/Polymer
Number of Cells	1
Fault Protection	Over Current, Over Voltage
Operating Temperature Range	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	SC-74A, SOT-753
Supplier Device Package	SOT-25
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution of the AP9101CK-AITRG1 is determined by the following critical parameters:

Primary Substitution Criteria (Must Match):

Manufacturer: Diodes Incorporated
Function: Battery Protection
Battery Chemistry: Lithium Ion/Polymer
Number of Cells: 1
Fault Protection: Over Current, Over Voltage
Operating Temperature Range: -40°C ~ 85°C (TA)
Mounting Type: Surface Mount
Package / Case: SC-74A, SOT-753
Supplier Device Package: SOT-25
RoHS Status: ROHS3 Compliant
MSL Rating: 1 (Unlimited)

Secondary Variation Parameter (Allowed to Differ):

Packaging Format: Tape & Reel (TR), Cut Tape (CT), or Cut Tape & Digi-Reel® are interchangeable based on manufacturing and assembly requirements
Product Status: Active or Obsolete variants within the AP9101 family maintain electrical and mechanical compatibility

All substitute parts listed below are from the Diodes Incorporated AP9101 product family and share identical electrical specifications, thermal characteristics, and physical form factors.

Parameter Comparison

Part Number	Manufacturer	Packaging	Product Status	Battery Chemistry	Fault Protection	Operating Temperature	Package Type	RoHS Status
AP9101CK-AITRG1	Diodes Incorporated	Tape & Reel (TR)	Active	Lithium Ion/Polymer	Over Current, Over Voltage	-40°C ~ 85°C	SOT-25	ROHS3 Compliant
AP9101CAK-ABTRG1	Diodes Incorporated	Cut Tape (CT) & Digi-Reel®	Obsolete	Lithium Ion/Polymer	Over Current, Over Voltage	-40°C ~ 85°C	SOT-25	ROHS3 Compliant
AP9101CAK-AKTRG1	Diodes Incorporated	Cut Tape (CT) & Digi-Reel®	Obsolete	Lithium Ion/Polymer	Over Current, Over Voltage	-40°C ~ 85°C	SOT-25	ROHS3 Compliant
AP9101CAK-ANTRG1	Diodes Incorporated	Cut Tape (CT)	Obsolete	Lithium Ion/Polymer	Over Current, Over Voltage	-40°C ~ 85°C	SOT-25	ROHS3 Compliant
AP9101CAK-BRTRG1	Diodes Incorporated	Tape & Reel (TR)	Obsolete	Lithium Ion/Polymer	Over Current, Over Voltage	-40°C ~ 85°C	SOT-25	ROHS3 Compliant
AP9101CAK-CPTRG1	Diodes Incorporated	Tape & Reel (TR)	Obsolete	Lithium Ion/Polymer	Over Current, Over Voltage	-40°C ~ 85°C	SOT-25	ROHS3 Compliant
AP9101CK-AHTRG1	Diodes Incorporated	Cut Tape (CT) & Digi-Reel®	Obsolete	Lithium Ion/Polymer	Over Current, Over Voltage	-40°C ~ 85°C	SOT-25	ROHS3 Compliant
AP9101CK-AKTRG1	Diodes Incorporated	Cut Tape (CT)	Obsolete	Lithium Ion/Polymer	Over Current, Over Voltage	-40°C ~ 85°C	SOT-25	ROHS3 Compliant
AP9101CK-ASTRG1	Diodes Incorporated	Cut Tape (CT)	Obsolete	Lithium Ion/Polymer	Over Current, Over Voltage	-40°C ~ 85°C	SOT-25	ROHS3 Compliant
AP9101CK-AUTRG1	Diodes Incorporated	Cut Tape (CT)	Obsolete	Lithium Ion/Polymer	Over Current, Over Voltage	-40°C ~ 85°C	SOT-25	ROHS3 Compliant
BQ29729DSET	Texas Instruments	Tape & Reel (TR)	Active	Lithium Ion/Polymer	Over Current, Over/Under Voltage, Short Circuit	-40°C ~ 85°C	6-WSON (1.5x1.5)	ROHS3 Compliant

Engineering Selection Recommendations

Within AP9101 Family (Diodes Incorporated):

All AP9101 variants listed above are electrically and mechanically equivalent to the AP9101CK-AITRG1. Selection among these parts is determined by packaging format availability and manufacturing process requirements:

Tape & Reel (TR) Format: AP9101CK-AITRG1 (Active), AP9101CAK-BRTRG1 (Obsolete), AP9101CAK-CPTRG1 (Obsolete) are suitable for automated pick-and-place assembly operations.
Cut Tape (CT) Format: AP9101CAK-ANTRG1, AP9101CK-AKTRG1, AP9101CK-ASTRG1, AP9101CK-AUTRG1 are suitable for manual assembly or lower-volume production runs.
Cut Tape & Digi-Reel® Format: AP9101CAK-ABTRG1, AP9101CAK-AKTRG1, AP9101CK-AHTRG1 provide flexibility between automated and manual assembly processes.

The AP9101CK-AITRG1 is the recommended primary selection as it maintains Active product status with full manufacturer support and availability.

Cross-Manufacturer Alternative (Texas Instruments):

The BQ29729DSET from Texas Instruments is a manufacturer-recommended alternative that provides single-cell lithium ion/polymer battery protection with expanded fault protection capabilities (Over Current, Over/Under Voltage, Short Circuit). This part operates within the same temperature range (-40°C ~ 85°C) and maintains ROHS3 compliance. However, the BQ29729DSET uses a different package format (6-WSON 1.5x1.5) and requires PCB layout redesign. This alternative is suitable only when design flexibility permits package change and when the additional short-circuit protection feature is required.

Frequently Asked Questions (FAQ)

Q: Can I substitute AP9101CK-AITRG1 with any other AP9101 variant?

A: Yes. All AP9101 variants listed in the parameter comparison table are electrically and mechanically equivalent. The only difference is packaging format (Tape & Reel, Cut Tape, or Cut Tape & Digi-Reel®). Selection depends on your assembly process requirements, not electrical performance.

Q: What is the difference between Tape & Reel, Cut Tape, and Cut Tape & Digi-Reel® packaging?

A: Tape & Reel (TR) is supplied on continuous carrier tape in reel format, optimized for high-speed automated assembly. Cut Tape (CT) is supplied as individual tape segments, suitable for manual assembly or lower volumes. Cut Tape & Digi-Reel® combines both formats, offering flexibility for mixed assembly processes.

Q: Why are some AP9101 variants marked as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production and support for that specific part number variant. However, these parts remain electrically and mechanically identical to active variants. Obsolete parts may still be available from inventory but lack manufacturer warranty and technical support. The AP9101CK-AITRG1 (Active status) is recommended for new designs.

Q: Can I use the BQ29729DSET as a direct replacement?

A: No. The BQ29729DSET uses a different package format (6-WSON 1.5x1.5 versus SOT-25) and requires PCB redesign. This part is suitable only when design flexibility permits package change. The BQ29729DSET offers additional short-circuit protection, which may be beneficial in some applications but is not required for AP9101CK-AITRG1 compatibility.

Q: Are all listed parts ROHS3 compliant?

A: Yes. All parts listed, including AP9101 variants and the BQ29729DSET, are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Q: What is the operating temperature range for these parts?

A: All listed parts operate within -40°C to 85°C (TA). This range is identical across all AP9101 variants and the BQ29729DSET alternative.

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