FAB3103UCX Equivalent & Substitute Parts

Part Overview

The FAB3103UCX is a Class D mono amplifier IC manufactured by onsemi, designed for low-power audio applications with 2.3W output at 8Ohm load. The device integrates advanced protection features including automatic gain control (AGC), depop circuitry, differential inputs, short-circuit protection, and thermal shutdown. The FAB3103UCX is classified as obsolete, necessitating identification of active substitute components that maintain functional and electrical compatibility for new designs and production continuity.

Substiute Parts

FAB3103UCX

onsemiIn Stock: 4389FAB3103UCX Datasheet

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TPA2015D1YZHR

Texas InstrumentsIn Stock: 16141TPA2015D1YZHR Datasheet

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TPA2025D1YZGR

Texas InstrumentsIn Stock: 39297TPA2025D1YZGR Datasheet

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TPA2025D1YZGT

Texas InstrumentsIn Stock: 51220TPA2025D1YZGT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the FAB3103UCX is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Amplifier topology: Class D
• Channel configuration: 1-Channel (Mono)
• Supply voltage range: 2.5V ~ 5.2V (identical range required)
• Operating temperature range: -40°C ~ 85°C (TA)
• Mounting type: Surface Mount
• Protection features: Short-circuit and thermal protection (minimum requirement)
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected

Secondary Compatibility Factors:

• Differential input architecture
• Moisture sensitivity level MSL 1
• ECCN and HTSUS classifications

The three substitute parts (TPA2015D1YZHR, TPA2025D1YZGR, TPA2025D1YZGT) satisfy all primary substitution criteria. Output power specifications vary based on load impedance, and package form factors differ; however, these variations remain within acceptable substitution parameters for Class D mono amplifier applications.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The FAB3103UCX is classified as obsolete. All three substitute parts (TPA2015D1YZHR, TPA2025D1YZGR, TPA2025D1YZGT) maintain active product status with Texas Instruments, ensuring long-term availability and continued manufacturing support.

Regulatory and Compliance Alignment: All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the original FAB3103UCX. Moisture sensitivity level MSL 1 is consistent across all candidates, eliminating moisture-related handling constraints.

Electrical Parameter Alignment: Supply voltage range (2.5V ~ 5.2V) and operating temperature range (-40°C ~ 85°C) are identical across all parts, ensuring direct functional compatibility in existing circuit designs. Differential input architecture is preserved in all substitutes.

Protection Feature Consideration: The FAB3103UCX includes AGC and depop features beyond the minimum short-circuit and thermal protection. The substitute parts provide short-circuit and thermal protection as core features. Circuit designs dependent on AGC or depop functionality require evaluation of alternative implementation methods or confirmation that substitute performance is acceptable.

Package and Form Factor: Package differences exist between candidates. The FAB3103UCX uses 12-WLCSP (1.86x1.44), while TPA2015D1YZHR uses 16-DSBGA (2.24x2.16), and both TPA2025 variants use 12-DSBGA. PCB layout modifications are required for any package transition.

Frequently Asked Questions (FAQ)

Q: Can TPA2025D1YZGR and TPA2025D1YZGT be used interchangeably with FAB3103UCX?

A: Both TPA2025 variants satisfy the core substitution criteria: Class D mono amplifier topology, identical supply voltage range (2.5V ~ 5.2V), matching operating temperature range (-40°C ~ 85°C), differential inputs, and short-circuit/thermal protection. Output power specification is 2.28W at 4Ohm load versus 2.3W at 8Ohm for the FAB3103UCX. Load impedance in the target application determines whether this power differential is acceptable. Package form factor differs (12-DSBGA versus 12-WLCSP), requiring PCB layout modification.

Q: What is the difference between TPA2025D1YZGR and TPA2025D1YZGT?

A: Both parts are identical in electrical specifications, package type (12-DSBGA), and functional features. The difference is packaging format: TPA2025D1YZGR and TPA2025D1YZGT both ship in Tape & Reel (TR) format. Inventory levels differ (39207 Pcs for YZGR versus 51178 Pcs for YZGT), but this does not affect electrical or mechanical compatibility.

Q: Why does TPA2015D1YZHR have different output power specifications?

A: TPA2015D1YZHR specifies 2W at 8Ohm load, compared to FAB3103UCX at 2.3W at 8Ohm. This represents a 13% reduction in maximum output power. The difference is inherent to the TPA2015 device design. Applications requiring the full 2.3W output power at 8Ohm should use TPA2025 variants instead.

Q: Are package differences critical for substitution?

A: Package differences require PCB layout redesign. FAB3103UCX uses 12-WLCSP (1.86x1.44), TPA2015D1YZHR uses 16-DSBGA (2.24x2.16), and TPA2025 variants use 12-DSBGA. Footprint, via placement, and thermal management characteristics differ. Schematic-level substitution is valid; board-level implementation requires layout modification.

Q: Are the AGC and depop features of FAB3103UCX available in substitute parts?

A: TPA2015D1YZHR, TPA2025D1YZGR, and TPA2025D1YZGT provide short-circuit and thermal protection as core features. AGC and depop functionality present in FAB3103UCX are not specified in the substitute parts. Applications relying on these features require alternative implementation or confirmation that substitute performance meets system requirements.

Q: Do all substitute parts maintain identical regulatory compliance?

A: Yes. All substitute parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (unlimited moisture sensitivity level). ECCN and HTSUS classifications are identical across all parts, maintaining regulatory alignment with the original FAB3103UCX.

Q: What is the supply voltage compatibility across all parts?

A: All parts, including FAB3103UCX and all three substitutes, operate within the identical supply voltage range of 2.5V ~ 5.2V. No voltage supply circuit modifications are required for substitution.

Q: Are there inventory considerations for substitute selection?

A: TPA2025D1YZGT maintains the highest inventory level (51178 Pcs), followed by TPA2025D1YZGR (39207 Pcs) and TPA2015D1YZHR (16104 Pcs). For high-volume production, TPA2025D1YZGT offers the greatest supply assurance. All three parts are active products with ongoing manufacturing support.