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LM1875 - 20W Audio Power Amplifier

View LM1875T: -20W Audio Power Amplifier

LM1875T: -20W Audio Power Amplifier

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National Semiconductor
Jameco Part no. 23270
Manufacturer no. LM1875T
Catalog 152 , page 9
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1+ $3.15
10+ $2.95
100+ $2.75
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LM1875 - 20W Audio Power Amplifier

The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications. The LM1875 delivers 20 watts into a 4Ω or 8Ω load on ±25V supplies. Using an 8Ω load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown.

The LM1875 design takes advantage of advanced circuit techniques and processing to achieve extremely low distortion levels even at high output power levels. Other outstanding features include high gain, fast slew rate and a wide power bandwidth, large output voltage swing, high current capability, and a very wide supply range. The amplifier is internally compensated and stable for gains of 10 or greater.


  • Up to 30 watts output power
  • AVO typically 90 dB
  • Low distortion: 0.015%, 1 kHz, 20 W
  • Wide power bandwidth: 70 kHz
  • Protection for AC and DC short circuits to ground
  • Thermal protection with parole circuit
  • High current capability: 4A
  • Wide supply range 16V-60V
  • Internal output protection diodes
  • 94 dB ripple rejection
  • Plastic power package TO-220


  • High performance audio systems
  • Bridge amplifiers
  • Stereo phonographs
  • Servo amplifiers
  • Instrument systems

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  • Specification Value
    Power Supply TypeSingle|Dual
    Minimum Single Supply Voltage16V
    Output Signal TypeSingle
    Typical Single Supply Voltage18V|24V|28V
    Maximum Single Supply Voltage60V
    Typical Dual Supply Voltage±9V|±12V|±15V|±18V|±24V|±28V
    Maximum Input Bias Current2uA@±25V
    Maximum Input Offset Voltage15mV@±25V
    Amplifier TypeClass-AB
    Maximum Load Resistance8Ohm
    Maximum Supply Current100mA@±25V
    Typical Output Power x Channels @ Load25Wx1@8Ohm
    Minimum Dual Supply Voltage±8V
    Typical PSRR95dB
    Maximum Dual Supply Voltage±30V
    Rail to RailNo
    Specification Value
    Total Harmonic Distortion Noise0.015%@8Ohm@20W
    Maximum Operating Temperature150°C
    MountingThrough Hole
    Product Height8.89mm(Max)
    Product TypeAudio Amplifier
    Product Width4.7mm(Max)
    Product Length10.16mm
    Typical Gain Bandwidth Product5.5MHz
    Typical Voltage Gain90dB
    Typical Supply Current70mA@±25V
    Input Signal TypeSingle
    Output Type1-Channel Mono

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