LM1876T Equivalent & Substitute Parts

Part Overview

The LM1876T is a Class AB stereo audio amplifier IC manufactured by Texas Instruments, designed for 2-channel audio applications with 22W output power per channel at 4Ω load impedance. The device features integrated protection circuits including depop, mute, short-circuit, and thermal protection functions. The LM1876T is classified as obsolete product status, necessitating identification of active equivalent alternatives for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility across supply voltage ranges, output power specifications, and thermal operating conditions while accommodating packaging and compliance variations.

Substiute Parts

LM1876T

Texas InstrumentsIn Stock: 1504LM1876T Datasheet

Current PartRFQ

LM1876TF/NOPB

Texas InstrumentsIn Stock: 52552LM1876TF/NOPB Datasheet

MFR RecommendedRFQ

LM4766T/NOPB

Texas InstrumentsIn Stock: 52588LM4766T/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM1876T is determined by the following critical parameters:

Primary Compatibility Criteria:

• Amplifier topology: Class AB configuration
• Channel count: 2-Channel (Stereo) output
• Package form factor: TO-220-15 or TO-220-15 Isolated variants
• Mounting method: Through Hole
• Operating temperature range: -20°C ~ 85°C (TA)
• Protection feature set: Minimum requirement of depop, mute, and thermal protection

Electrical Performance Parameters:

• Supply voltage operating range must encompass or match the original specification
• Output power per channel must equal or exceed the 22W @ 4Ω requirement
• Load impedance compatibility at rated power output

Two substitute parts are identified based on these criteria:

1. LM1876TF/NOPB: Direct functional equivalent with identical electrical specifications and enhanced package isolation. Active product status with RoHS3 compliance.

2. LM4766T/NOPB: Higher-performance alternative with increased output power (40W @ 8Ω) and modified supply voltage range. Active product status with RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

LM1876TF/NOPB Selection Criteria:

The LM1876TF/NOPB is the direct functional equivalent for applications requiring identical electrical performance to the LM1876T. This substitute maintains 22W per channel output power at 4Ω load impedance and identical supply voltage operating range (20V ~ 64V, ±10V ~ 32V). The primary distinction is the TO-220-15 Isolated Tab package variant, which provides enhanced thermal isolation properties compared to the standard formed leads configuration. The LM1876TF/NOPB carries Active product status and ROHS3 compliance certification, addressing obsolescence and regulatory requirements. This part is suitable for direct replacement in existing designs without circuit modification.

LM4766T/NOPB Selection Criteria:

The LM4766T/NOPB is a higher-performance alternative for applications where increased output power capacity is beneficial. This device delivers 40W per channel at 8Ω load impedance, representing a 1.8x power increase relative to the LM1876T at the 4Ω reference load. The supply voltage range is modified to 20V ~ 60V (±10V ~ 30V), which is narrower than the LM1876T specification. The LM4766T/NOPB omits short-circuit protection while retaining depop, mute, and thermal protection features. This substitute is appropriate for designs with higher power requirements and supply voltage constraints within the specified range. Active product status and ROHS3 compliance are provided.

Compliance and Availability:

Both substitute parts are manufactured by Texas Instruments within the Overture™ series and maintain REACH Unaffected status. The LM1876TF/NOPB demonstrates superior inventory availability (52,488 pcs) and represents the preferred direct replacement. The LM4766T/NOPB is also available in equivalent quantity and is suitable for performance-enhanced applications.

Frequently Asked Questions (FAQ)

Q: Can the LM1876TF/NOPB be used as a direct replacement for the LM1876T?

A: Yes. The LM1876TF/NOPB maintains identical electrical specifications including Class AB topology, 2-channel stereo configuration, 22W per channel output power at 4Ω, and supply voltage range (20V ~ 64V, ±10V ~ 32V). The primary difference is the TO-220-15 Isolated Tab package variant, which provides improved thermal isolation. No circuit modifications are required for substitution.

Q: What is the difference between the TO-220-15 and TO-220-15 Isolated Tab packages?

A: The TO-220-15 Isolated Tab variant (used in LM1876TF/NOPB) provides electrical isolation of the mounting tab from the device substrate, reducing thermal coupling between the tab and internal circuitry. The standard TO-220-15 Formed Leads package (used in LM1876T and LM4766T/NOPB) does not include this isolation feature. Both packages are through-hole mounted and mechanically compatible with standard TO-220-15 footprints.

Q: When should the LM4766T/NOPB be selected instead of the LM1876TF/NOPB?

A: The LM4766T/NOPB is selected for applications requiring higher output power (40W per channel at 8Ω) or when operating at 8Ω load impedance is the primary design constraint. The narrower supply voltage range (20V ~ 60V, ±10V ~ 30V) must be verified as compatible with the application power supply. The absence of short-circuit protection in the LM4766T/NOPB should be evaluated against circuit-level protection requirements.

Q: Are there any thermal management differences between these parts?

A: All three parts operate within the same temperature range (-20°C ~ 85°C TA) and share identical MSL rating (1, Unlimited). The LM1876TF/NOPB Isolated Tab package may provide improved thermal performance in specific mounting configurations due to tab isolation, but thermal management capability is primarily determined by PCB layout, heatsinking, and airflow conditions.

Q: What is the impact of RoHS compliance on part selection?

A: The LM1876T is RoHS non-compliant, while both LM1876TF/NOPB and LM4766T/NOPB are ROHS3 compliant. For applications subject to RoHS regulatory requirements or customer specifications mandating RoHS compliance, either substitute part is required. Both substitutes maintain REACH Unaffected status.

Q: Can the LM1876T be used in new designs?

A: The LM1876T is classified as Obsolete product status. While existing inventory may be available, new designs should utilize LM1876TF/NOPB or LM4766T/NOPB to ensure long-term supply continuity and regulatory compliance.