LM1876TF Equivalent & Substitute Parts

Part Overview

The LM1876TF is a Class AB stereo audio amplifier IC manufactured by Texas Instruments, part of the Overture™ series. This device delivers 22W per channel at 4Ω load in a TO-220-15 isolated package configuration. The LM1876TF is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and production requirements. Substitute parts must maintain functional compatibility across audio amplification applications while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value
Amplifier Type	Class AB
Output Configuration	2-Channel (Stereo)
Max Output Power @ 4Ω	22W x 2
Supply Voltage Range	20V ~ 64V, ±10V ~ 32V
Package Type	TO-220-15 Isolated
Mounting Type	Through Hole
Operating Temperature	-20°C ~ 85°C (TA)
Protection Features	Depop, Mute, Short-Circuit and Thermal Protection

Substitute Part Grouping Explanation

Substitute parts for the LM1876TF are classified based on the following substitution criteria:

Direct Equivalent (Pin-Compatible, Form-Fit-Function):

Identical output power specification (22W x 2 @ 4Ω)
Identical supply voltage range (20V ~ 64V, ±10V ~ 32V)
Identical package configuration (TO-220-15 Isolated)
Identical protection feature set (Depop, Mute, Short-Circuit and Thermal Protection)
Same operating temperature range (-20°C ~ 85°C)

Manufacturer Recommended Upgrade (Higher Performance):

Same amplifier class (Class AB)
Same stereo output configuration (2-Channel)
Same package family (TO-220-15)
Same mounting type (Through Hole)
Same operating temperature range (-20°C ~ 85°C)
Enhanced output power capability (40W x 2 @ 8Ω)
Overlapping supply voltage range with minor differences

Parameter Comparison

Parameter	LM1876TF	LM1876TF/NOPB	LM4766T/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Category	Linear, Amplifiers	Linear, Amplifiers	Linear, Amplifiers
Series	Overture™	Overture™	Overture™
Product Status	Obsolete	Active	Active
Amplifier Type	Class AB	Class AB	Class AB
Output Configuration	2-Channel (Stereo)	2-Channel (Stereo)	2-Channel (Stereo)
Max Output Power @ 4Ω	22W x 2	22W x 2	Not specified at 4Ω
Max Output Power @ 8Ω	Not specified	Not specified	40W x 2
Supply Voltage Range	20V ~ 64V, ±10V ~ 32V	20V ~ 64V, ±10V ~ 32V	20V ~ 60V, ±10V ~ 30V
Package Type	TO-220-15 Isolated	TO-220-15 Isolated	TO-220-15
Mounting Type	Through Hole	Through Hole	Through Hole
Operating Temperature	-20°C ~ 85°C (TA)	-20°C ~ 85°C (TA)	-20°C ~ 85°C (TA)
Protection Features	Depop, Mute, Short-Circuit and Thermal Protection	Depop, Mute, Short-Circuit and Thermal Protection	Depop, Mute, Thermal Protection
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging	Bulk	Tube	Tube

Engineering Selection Recommendations

LM1876TF/NOPB is the direct equivalent substitute for the obsolete LM1876TF. This part maintains identical electrical specifications, package configuration, and protection features. The primary advantage is active product status with current manufacturing availability. LM1876TF/NOPB is ROHS3 compliant, addressing regulatory requirements that the original LM1876TF does not meet. This substitute is appropriate for direct replacement in existing designs without circuit modification.

LM4766T/NOPB is a manufacturer-recommended upgrade option. This part operates within the same amplifier class and stereo configuration but delivers higher output power (40W x 2 @ 8Ω). The supply voltage range is slightly reduced (20V ~ 60V, ±10V ~ 30V) compared to the LM1876TF. The LM4766T/NOPB package is TO-220-15 without isolation specification. This substitute is suitable for applications requiring enhanced power delivery, provided the circuit design accommodates the modified voltage specifications and package configuration. The LM4766T/NOPB is ROHS3 compliant and maintains active product status.

Both substitute parts are manufactured by Texas Instruments and belong to the Overture™ series, ensuring design continuity and technical support consistency.

Frequently Asked Questions (FAQ)

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

A: Yes. LM1876TF/NOPB is electrically and mechanically identical to LM1876TF. Both parts deliver 22W x 2 @ 4Ω, operate across 20V ~ 64V (±10V ~ 32V), and use the TO-220-15 isolated package. The primary difference is product status: LM1876TF/NOPB is active and ROHS3 compliant, while LM1876TF is obsolete and RoHS non-compliant. No circuit modifications are required.

Q: What is the difference between LM1876TF and LM4766T/NOPB?

A: LM4766T/NOPB delivers higher output power (40W x 2 @ 8Ω) compared to LM1876TF (22W x 2 @ 4Ω). The supply voltage range is narrower for LM4766T/NOPB (20V ~ 60V, ±10V ~ 30V versus 20V ~ 64V, ±10V ~ 32V). The LM4766T/NOPB package is TO-220-15 without isolation specification, whereas LM1876TF uses TO-220-15 isolated. Both maintain Class AB operation and stereo configuration.

Q: Are package differences between LM1876TF and LM4766T/NOPB significant?

A: The LM1876TF uses TO-220-15 isolated package, while LM4766T/NOPB uses TO-220-15 without isolation specification. This difference affects thermal and electrical isolation characteristics. Verify circuit board layout and thermal management requirements before substituting LM4766T/NOPB for LM1876TF.

Q: What compliance advantages do substitute parts offer?

A: Both LM1876TF/NOPB and LM4766T/NOPB are ROHS3 compliant, whereas the original LM1876TF is RoHS non-compliant. This compliance status is critical for applications subject to regulatory requirements in electronics manufacturing and distribution.

Q: Which substitute part should be selected for new designs?

A: For applications requiring 22W x 2 @ 4Ω output, select LM1876TF/NOPB. For applications requiring higher power output (40W x 2 @ 8Ω), select LM4766T/NOPB. Verify supply voltage compatibility and package isolation requirements for your specific circuit design.

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