LM3876T/NOPB Equivalent & Substitute Parts

Part Overview

The LM3876T/NOPB is a Class AB audio amplifier IC manufactured by Texas Instruments, designed for mono audio applications with 56W output power at 8Ω load. The device features integrated mute, short-circuit, and thermal protection in a TO-220-11 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain functional compatibility across key electrical parameters including supply voltage range, output power specifications, protection features, and thermal operating range.

Substiute Parts

LM3876T/NOPB

Texas InstrumentsIn Stock: 938LM3876T/NOPB Datasheet

Current PartRFQ

LM3886T/NOPB

National SemiconductorIn Stock: 2537LM3886T/NOPB Datasheet

MFR RecommendedRFQ

TDA7296

STMicroelectronicsIn Stock: 17874TDA7296 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM3876T/NOPB are selected based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Amplifier Type: Class AB topology
• Channel Configuration: 1-Channel (Mono) output
• Supply Voltage Range: Compatibility with 20V ~ 84V or ±10V ~ 42V operation
• Output Power: Minimum 56W at specified load impedance
• Protection Features: Mute, short-circuit, and thermal protection
• Package Type: TO-220-11 or equivalent through-hole package
• Operating Temperature Range: Support for -20°C ~ 85°C or compatible range
• Compliance: ROHS3 compliance and EAR99 classification

Substitutes are grouped into two categories: MFR Recommended parts that maintain direct functional equivalence with enhanced specifications, and Compatible Alternative parts that meet core substitution criteria while operating within defined parameter boundaries.

Parameter Comparison

Engineering Selection Recommendations

LM3886T/NOPB (MFR Recommended Primary Substitute)

The LM3886T/NOPB is the preferred substitute for the obsolete LM3876T/NOPB. Both devices share identical supply voltage specifications (20V ~ 84V, ±10V ~ 42V), identical operating temperature range (-20°C ~ 85°C), and belong to the same Overture™ series. The LM3886T/NOPB provides enhanced output power (68W @ 4Ω versus 56W @ 8Ω), maintains the same TO-220-11 package configuration, and includes identical protection features. The LM3886T/NOPB holds Active product status with full ROHS3 compliance and EAR99 classification, ensuring long-term availability and regulatory compliance. Pin-compatible design enables direct board-level substitution without circuit modification.

TDA7296 (Compatible Alternative Substitute)

The TDA7296 manufactured by STMicroelectronics provides an alternative substitution path when LM3886T/NOPB availability is constrained. The TDA7296 maintains Class AB topology, mono output configuration, and delivers 60W @ 8Ω output power, meeting or exceeding the original 56W specification. The device includes enhanced protection features (Depop, Mute, Short-Circuit, Thermal Protection, and Standby mode). However, the TDA7296 operates within a narrower supply voltage range (±10V ~ 35V) and reduced operating temperature range (0°C ~ 70°C), and uses a Multiwatt-15 package requiring PCB layout modification. The TDA7296 is Active status with ROHS3 compliance. Selection of TDA7296 requires verification of application-specific supply voltage and temperature requirements.

Frequently Asked Questions (FAQ)

Q1: Can the LM3886T/NOPB directly replace the LM3876T/NOPB without PCB modifications?

A: Yes. The LM3886T/NOPB is pin-compatible with the LM3876T/NOPB, sharing identical TO-220-11 package configuration, supply voltage range (20V ~ 84V, ±10V ~ 42V), operating temperature range (-20°C ~ 85°C), and protection feature set. Direct substitution on existing PCBs is supported without circuit redesign.

Q2: What are the key differences between LM3886T/NOPB and TDA7296 substitution?

A: The LM3886T/NOPB maintains identical electrical specifications and package form factor to the original LM3876T/NOPB. The TDA7296 offers enhanced protection features (Depop and Standby mode) but operates within a narrower supply voltage range (±10V ~ 35V maximum versus ±10V ~ 42V) and reduced temperature range (0°C ~ 70°C versus -20°C ~ 85°C). The TDA7296 uses a Multiwatt-15 package requiring PCB layout changes. Selection depends on application voltage and temperature requirements.

Q3: Are both substitute parts ROHS3 compliant?

A: Yes. Both the LM3886T/NOPB and TDA7296 are ROHS3 compliant and carry EAR99 classification, meeting current regulatory requirements for electronic component procurement and deployment.

Q4: What is the output power difference between the original LM3876T/NOPB and LM3886T/NOPB?

A: The LM3876T/NOPB delivers 56W @ 8Ω load. The LM3886T/NOPB delivers 68W @ 4Ω load. At 8Ω load, the LM3886T/NOPB provides equivalent or superior output power, making it a direct performance upgrade.

Q5: Can the TDA7296 be used in applications requiring -20°C operating temperature?

A: No. The TDA7296 operating temperature range is 0°C ~ 70°C (TA), which does not support the -20°C minimum temperature of the original LM3876T/NOPB. Applications requiring -20°C operation must use the LM3886T/NOPB.

Q6: What supply voltage limitations apply to the TDA7296?

A: The TDA7296 operates within ±10V ~ 35V supply range. Applications requiring supply voltages above ±35V (up to ±42V supported by LM3876T/NOPB and LM3886T/NOPB) cannot use the TDA7296 without external voltage regulation.

Q7: Are there pin-out differences between the three amplifier ICs?

A: The LM3876T/NOPB and LM3886T/NOPB share identical TO-220-11 pin configurations. The TDA7296 uses a Multiwatt-15 package with different pin assignments, requiring PCB layout redesign and schematic verification before substitution.