LM3875TF/NOPB Equivalent & Substitute Parts

Part Overview

The LM3875TF/NOPB is a Class AB mono amplifier IC manufactured by Texas Instruments, part of the Overture™ series. This device delivers 56W output power at 8Ω load in a TO-220-11 isolated package with integrated short-circuit and thermal protection. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts must maintain functional compatibility across supply voltage ranges, output power specifications, and thermal operating conditions while accommodating package and feature variations.

Substiute Parts

LM3875TF/NOPB

Texas InstrumentsIn Stock: 1134LM3875TF/NOPB Datasheet

Current PartRFQ

LM3886TF/NOPB

Texas InstrumentsIn Stock: 4302LM3886TF/NOPB Datasheet

MFR RecommendedRFQ

TDA7296

STMicroelectronicsIn Stock: 17874TDA7296 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM3875TF/NOPB is determined by the following criteria:

Primary Compatibility Factors:

• Amplifier topology: Class AB configuration
• Output stage: Single-channel (mono) operation
• Supply voltage compatibility: Minimum overlap with ±10V ~ 42V range
• Mounting method: Through-hole package types
• Protection capability: Integrated short-circuit and thermal protection
• Regulatory compliance: ROHS3 and REACH status

Substitutes are grouped based on:

1. Voltage supply range overlap with the original part
2. Output power delivery at standard load impedances (4Ω, 8Ω)
3. Package form factor and pin isolation characteristics
4. Operating temperature range coverage
5. Feature set alignment (protection and control functions)

Parameter Comparison

Engineering Selection Recommendations

LM3886TF/NOPB (Manufacturer Recommended Substitute)

The LM3886TF/NOPB is the primary substitute for the obsolete LM3875TF/NOPB. Both devices share identical supply voltage ranges (±10V ~ 42V), matching operating temperature specifications (-20°C ~ 85°C), and the same TO-220-11 isolated package footprint. The LM3886TF/NOPB delivers higher output power (68W @ 4Ω) and maintains the same thermal and short-circuit protection architecture. The LM3886TF/NOPB is currently in active production status with higher inventory availability (4199 units). This substitute requires no circuit redesign for voltage supply or thermal management systems. The addition of mute functionality provides enhanced control capability without compromising existing application requirements.

TDA7296 (Alternative Substitute)

The TDA7296 from STMicroelectronics provides an alternative substitution path with active product status and substantial inventory (17849 units). This device operates within a narrower supply voltage range (±10V ~ 35V), which is compatible with the lower portion of the LM3875TF/NOPB specification. Output power at 8Ω (60W) exceeds the original part specification. The TDA7296 uses a Multiwatt-15 package instead of TO-220-11, requiring PCB layout modification and different thermal management considerations. Operating temperature range is reduced to 0°C ~ 70°C, limiting applicability in extended temperature environments. The TDA7296 includes additional protection features (depop, standby mode) suitable for consumer audio applications. Package change necessitates design review and validation.

Frequently Asked Questions (FAQ)

Q: Can the LM3886TF/NOPB directly replace the LM3875TF/NOPB without circuit modifications?

A: Yes. Both devices share identical supply voltage specifications (±10V ~ 42V), operating temperature range (-20°C ~ 85°C), and TO-220-11 isolated package pinout. No circuit redesign is required. The LM3886TF/NOPB provides higher output power capability, making it a direct functional upgrade.

Q: What are the package differences between LM3886TF/NOPB and TDA7296?

A: The LM3886TF/NOPB uses TO-220-11 isolated package with formed leads, identical to the original LM3875TF/NOPB. The TDA7296 uses Multiwatt-15 package with vertical, bent, and staggered leads. These packages have different footprints, pin spacing, and thermal interface requirements. PCB redesign is necessary for TDA7296 substitution.

Q: Are there supply voltage compatibility issues with the TDA7296?

A: The TDA7296 operates within ±10V ~ 35V range, which is narrower than the LM3875TF/NOPB specification (±10V ~ 42V). Applications requiring supply voltages between 35V and 42V cannot use the TDA7296. Verify your supply voltage specification before selecting this substitute.

Q: What is the operating temperature limitation of the TDA7296?

A: The TDA7296 operates from 0°C ~ 70°C, compared to the LM3875TF/NOPB range of -20°C ~ 85°C. Applications requiring operation below 0°C or above 70°C must use the LM3886TF/NOPB substitute.

Q: Do the substitute parts include the same protection features?

A: The LM3886TF/NOPB includes short-circuit and thermal protection, matching the original part. The TDA7296 adds depop, mute, and standby functions. All three devices provide short-circuit and thermal protection as baseline requirements.

Q: What inventory status should influence my selection?

A: The LM3886TF/NOPB (4199 units) and TDA7296 (17849 units) are both in active production with substantial stock. The LM3875TF/NOPB is obsolete with limited remaining inventory (1085 units). For new designs and production continuity, select from active products.

Q: Is thermal management identical between these devices?

A: The LM3886TF/NOPB uses the same TO-220-11 isolated package as the original, maintaining thermal interface compatibility. The TDA7296 Multiwatt-15 package has different thermal characteristics and may require modified heatsink mounting. Thermal analysis is required when switching to TDA7296.