LM391N-100 Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
The LM391N-100 is an audio amplifier driver IC from Texas Instruments designed to drive external power transistors in high-power audio amplifier stages. It delivers controlled gain and biasing for output stages handling up to 100W audio power applications. Available in a DIP package with worldwide shipping for consumer and industrial audio equipment.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- LM391N-100 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Audio driver IC designed to drive external NPN/PNP power transistor output stages for amplifiers up to 100W
- Integrated bias and gain control circuitry reduces discrete component count in high-power audio designs
- DIP through-hole package supports easy breadboard prototyping and field-serviceable audio amplifier boards
- Flexible supply voltage range accommodates standard ±25V to ±40V split-rail audio amplifier power supplies
Applications
The LM391N-100 is used as a driver stage in high-power audio amplifier designs where external power transistors handle output currents up to several amperes. It suits hi-fi stereo amplifiers, public address systems, and instrument amplifiers that require a stable, low-distortion driver interface between preamplifier and power output stages. Consumer electronics repair and custom audio equipment builders also use the DIP-packaged LM391N-100 for replacing driver stages in vintage or high-power audio amplifier circuits.
Specifications
| YTEOL | 0 |
| Consumer IC Type | AUDIO AMPLIFIER |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.33.00.01 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for LM391N-100:
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Frequently Asked Questions
What is the intended output power class for amplifier designs using the LM391N-100 driver IC?
The LM391N-100 is specified for audio amplifier systems in the 100W power class, driving external bipolar power transistors in the output stage while itself handling the gain-setting and biasing functions within a ±25V to ±40V split supply system.
How does the LM391N-100 reduce component count versus a discrete driver stage in a power amplifier?
By integrating bias network, voltage gain stage, and short-circuit protection features in a single DIP IC, the LM391N-100 eliminates at least 8 to 12 discrete resistors and transistors from the driver section, simplifying PCB layout and reducing assembly cost in stereo or mono audio amplifier modules.
Which power supply rail voltage does the LM391N-100 require for proper audio amplifier operation?
The LM391N-100 operates from dual (split) supply rails typical of audio amplifiers, such as ±25V, ±35V, or ±40V, which are standard in 50W to 100W hi-fi amplifier designs, allowing the output stage transistors to swing the full audio signal across 4-ohm or 8-ohm speaker loads.
Is the LM391N-100 a suitable driver replacement in vintage hi-fi amplifier repair scenarios?
Yes. Its DIP-8 through-hole footprint and standard audio driver pin configuration make it a practical drop-in for servicing 1970s–1990s hi-fi receivers and power amplifiers, particularly those delivering 50W to 100W per channel into 8-ohm loudspeakers, provided the supply rails match the ±25V to ±40V operating range.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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