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AP9101CAK-BFTRG1 Equivalent & Substitute Parts
Part Overview
The AP9101CAK-BFTRG1 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 format with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).
Substitute parts are necessary when the primary part reaches end-of-life status, when packaging format requirements change, or when alternative sourcing is required to maintain supply chain continuity. The substitute parts listed maintain electrical and mechanical compatibility through identical functional specifications and package footprints.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Function | Battery Protection |
| Battery Chemistry | Lithium Ion/Polymer |
| Number of Cells | 1 |
| Fault Protection | Over Current, Over Voltage |
| Operating Temperature Range | -40°C to 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) |
Substitute Part Grouping Explanation
Substitution eligibility for the AP9101CAK-BFTRG1 is determined by the following criteria:
Electrical Compatibility: All substitute parts must provide identical battery protection function for single-cell lithium ion/polymer applications with over-current and over-voltage fault protection. Operating temperature range must match or exceed -40°C to 85°C.
Mechanical Compatibility: All substitute parts must use the SC-74A/SOT-753 package footprint with SOT-25 supplier device package designation to ensure PCB layout compatibility without redesign.
Compliance & Certification: All substitute parts must maintain RoHS3 compliance and MSL 1 rating to meet regulatory and manufacturing process requirements.
Packaging Format Variations: Diodes Incorporated AP9101 variants are grouped by packaging delivery format (Tape & Reel, Cut Tape, or Cut Tape & Digi-Reel) while maintaining identical electrical and mechanical specifications. Product status (Active or Obsolete) is noted for supply planning purposes.
Cross-Manufacturer Alternative: The Texas Instruments BQ29717DSER provides functional equivalence with expanded fault protection (includes short-circuit detection and under-voltage protection) but uses a different package format (6-WSON) requiring PCB redesign.
Parameter Comparison
| Part Number | Manufacturer | Product Status | Packaging Format | Function | Battery Chemistry | Cells | Fault Protection | Temp Range | Package | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| AP9101CAK-BFTRG1 | Diodes Incorporated | Active | Tape & Reel (TR) | Battery Protection | Lithium Ion/Polymer | 1 | Over Current, Over Voltage | -40°C to 85°C | SC-74A, SOT-753 | RoHS3 Compliant |
| AP9101CAK-ABTRG1 | Diodes Incorporated | Obsolete | Cut Tape (CT) & Digi-Reel® | Battery Protection | Lithium Ion/Polymer | 1 | Over Current, Over Voltage | -40°C to 85°C | SC-74A, SOT-753 | RoHS3 Compliant |
| AP9101CAK-AKTRG1 | Diodes Incorporated | Obsolete | Cut Tape (CT) & Digi-Reel® | Battery Protection | Lithium Ion/Polymer | 1 | Over Current, Over Voltage | -40°C to 85°C | SC-74A, SOT-753 | RoHS3 Compliant |
| AP9101CAK-ANTRG1 | Diodes Incorporated | Obsolete | Cut Tape (CT) | Battery Protection | Lithium Ion/Polymer | 1 | Over Current, Over Voltage | -40°C to 85°C | SC-74A, SOT-753 | RoHS3 Compliant |
| AP9101CAK-BRTRG1 | Diodes Incorporated | Obsolete | Tape & Reel (TR) | Battery Protection | Lithium Ion/Polymer | 1 | Over Current, Over Voltage | -40°C to 85°C | SC-74A, SOT-753 | RoHS3 Compliant |
| AP9101CAK-CPTRG1 | Diodes Incorporated | Obsolete | Tape & Reel (TR) | Battery Protection | Lithium Ion/Polymer | 1 | Over Current, Over Voltage | -40°C to 85°C | SC-74A, SOT-753 | RoHS3 Compliant |
| AP9101CK-AHTRG1 | Diodes Incorporated | Obsolete | Cut Tape (CT) & Digi-Reel® | Battery Protection | Lithium Ion/Polymer | 1 | Over Current, Over Voltage | -40°C to 85°C | SC-74A, SOT-753 | RoHS3 Compliant |
| AP9101CK-AKTRG1 | Diodes Incorporated | Obsolete | Cut Tape (CT) | Battery Protection | Lithium Ion/Polymer | 1 | Over Current, Over Voltage | -40°C to 85°C | SC-74A, SOT-753 | RoHS3 Compliant |
| AP9101CK-ASTRG1 | Diodes Incorporated | Obsolete | Cut Tape (CT) | Battery Protection | Lithium Ion/Polymer | 1 | Over Current, Over Voltage | -40°C to 85°C | SC-74A, SOT-753 | RoHS3 Compliant |
| AP9101CK-AUTRG1 | Diodes Incorporated | Obsolete | Cut Tape (CT) | Battery Protection | Lithium Ion/Polymer | 1 | Over Current, Over Voltage | -40°C to 85°C | SC-74A, SOT-753 | RoHS3 Compliant |
| BQ29717DSER | Texas Instruments | Active | Tape & Reel (TR) | Battery Protection | Lithium Ion/Polymer | 1 | Over Current, Over/Under Voltage, Short Circuit | -40°C to 85°C | 6-WFDFN | RoHS3 Compliant |
Engineering Selection Recommendations
For Direct Footprint Compatibility: Select from the Diodes Incorporated AP9101 family variants (AP9101CAK-ABTRG1, AP9101CAK-AKTRG1, AP9101CAK-ANTRG1, AP9101CAK-BRTRG1, AP9101CAK-CPTRG1, AP9101CK-AHTRG1, AP9101CK-AKTRG1, AP9101CK-ASTRG1, AP9101CK-AUTRG1). All maintain identical SC-74A/SOT-753 package footprints and electrical specifications. The primary distinction is packaging delivery format. The AP9101CAK-BFTRG1 remains the active product; obsolete variants should be used only when existing inventory is available and supply continuity is not a concern.
For Active Product Status with Packaging Flexibility: The AP9101CAK-BFTRG1 (Tape & Reel) is the recommended primary selection as an active product with current manufacturing support. Obsolete variants within the AP9101 family are suitable only for legacy designs or when existing stock is available.
For Cross-Manufacturer Substitution: The Texas Instruments BQ29717DSER is an active product with expanded fault protection capabilities (short-circuit and under-voltage detection in addition to over-current and over-voltage). However, this part uses a 6-WSON package format, requiring PCB layout redesign and is not a direct footprint replacement. Selection of this part is appropriate only when design changes are feasible and enhanced protection features are required.
Compliance Verification: All listed parts maintain RoHS3 compliance and MSL 1 rating, meeting standard manufacturing and regulatory requirements for single-cell lithium ion/polymer battery protection applications.
Frequently Asked Questions (FAQ)
Q: Can AP9101CAK-BFTRG1 be replaced with any AP9101 variant without PCB modification?
A: Yes. All AP9101 variants listed use the identical SC-74A/SOT-753 package footprint. Substitution between variants requires no PCB layout changes. The difference between variants is packaging delivery format (Tape & Reel, Cut Tape, or Cut Tape & Digi-Reel), which affects procurement and assembly processes but not electrical or mechanical compatibility.
Q: What is the difference between Tape & Reel, Cut Tape, and Cut Tape & Digi-Reel packaging?
A: These are delivery and handling formats for surface mount components. Tape & Reel (TR) supplies components on continuous carrier tape wound on reels for automated pick-and-place assembly. Cut Tape (CT) provides the same tape format but cut into smaller lengths. Cut Tape & Digi-Reel® combines cut tape with a reel format for intermediate volume applications. All three formats contain electrically and mechanically identical parts; the format selection depends on assembly equipment and volume requirements.
Q: Why are most AP9101 variants marked as Obsolete?
A: Product status reflects manufacturing lifecycle. Obsolete variants indicate that Diodes Incorporated has transitioned production to newer part numbers or variants. The AP9101CAK-BFTRG1 (Active status) is the current production part. Obsolete variants may still be available from inventory but should not be selected for new designs requiring long-term supply continuity.
Q: Is BQ29717DSER a direct replacement for AP9101CAK-BFTRG1?
A: No. While BQ29717DSER provides single-cell lithium ion/polymer battery protection with the same operating temperature range and RoHS3 compliance, it uses a different package format (6-WSON versus SOT-25). Direct replacement requires PCB redesign. BQ29717DSER is suitable only when design changes are acceptable and the expanded fault protection features (short-circuit and under-voltage detection) are required.
Q: What fault protection does AP9101CAK-BFTRG1 provide?
A: The AP9101CAK-BFTRG1 provides over-current and over-voltage protection for single-cell lithium ion/polymer batteries. It does not include short-circuit or under-voltage detection. If these additional protections are required, cross-manufacturer alternatives such as BQ29717DSER must be evaluated with corresponding PCB redesign.
Q: Are all listed parts RoHS3 compliant?
A: Yes. All parts in this reference list maintain RoHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, meeting standard regulatory and manufacturing requirements for battery protection applications.
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