LM4766T/NOPB

Introduction to LM4766T/NOPB
- LM4766T is a TI dual-channel, audio power amplifier IC. The LM4766T is the TO-220 package variant; NOPB means Pb-free (lead-free).
- It contains two Class-AB audio amplifiers designed to drive loudspeakers (typically 4- or 8-ohm) from a single supply.
- Features commonly include protection against short-circuits and overheating, with robust performance suitable for consumer audio gear. It’s intended to minimize external parts while delivering good audio quality.
- Typical use cases: stereo/mini Hi-Fi systems, multimedia speakers, portable/compact audio devices requiring a single-chip amplifier.
- Design notes: provide the recommended input and gain-setting network, ensure adequate heatsinking for higher power, and follow the datasheet’s wiring and layout guidelines.
- For exact electrical specs, pinout, recommended circuits, and thermal considerations, refer to the TI LM4766T/NOPB datasheet.

There is no guaranteed pin‑for‑pin drop‑in equivalent to the TI LM4766T/NOPB. Comparable alternatives (dual audio power amplifiers with similar power and features) include NXP TDA7265 and ST TDA7297, but you must verify pinout, thermal, gain, mute/standby behavior and electrical specs before substitution. For exact replacements, consult TI’s cross‑reference or your distributor’s interchange database.

Here are the typical features of the LM4766T/NOPB:
- 2-channel stereo audio power amplifier (Class-AB) in a single package
- Suitable for 4-ohm and 8-ohm speaker loads
- Wide supply voltage range: approximately 4.5 V to 26 V
- Pop-free turn-on with mute/standby control
- Built-in protection: current limit, thermal shutdown, short-circuit protection, undervoltage lockout
- Low quiescent current and good efficiency
- High audio performance: low distortion and low noise
- Differential input capability with straightforward single-ended use
- Lead-free package option: LM4766T in a TO-220/through-hole style package (NOPB)
Note: for exact electrical specs (power output into each load, THD, PSRR, etc.), consult the current TI datasheet.

LM4766T/NOPB is supplied in a 20-pin TSSOP (lead‑free) package. It is a dual BTL audio power amplifier. Key pin functions (grouped):
- Power/Ground: PVCC (supply), GND (ground), thermal/power pad
- Speaker outputs: OUT_A+, OUT_A-, OUT_B+, OUT_B- (BTL outputs for two channels)
- Inputs: IN_A+, IN_A-, IN_B+, IN_B- (differential/single‑ended inputs)
- Control/bias: MUTE/SD or ST-BY (shutdown/mute control), BYPASS/VREF (internal reference/bypass)
- Bootstrap/compensation: BST/BOOT and COMP pins for stability and output swing
- Gain/set pins: pins for external resistor networks to set amplifier gain
For exact pin numbers and recommended external components, consult the TI LM4766 datasheet.

Manufacturer: Texas Instruments (TI).
What kind of company: TI is an American global semiconductor company (headquartered in Dallas, Texas) that designs, manufactures and sells analog and embedded-processing integrated circuits and related semiconductor products for automotive, industrial, consumer, and communications markets. The LM4766T/NOPB itself is a TI dual-channel audio power amplifier IC; the “/NOPB” suffix denotes a lead‑free (no Pb) package.

Applications of LM4766T/NOPB:
- Stereo power amplifier for home audio systems (mini hi‑fi, bookshelf speakers)
- TV/AV peripherals (set-top boxes, DVD/Blu‑ray players, soundbars)
- Computer and multimedia peripherals (PC speakers, docking stations)
- Portable/desktop speaker systems and karaoke equipment
- Small-format PA systems for consumer electronics

For LM4766T/NOPB: "T" denotes the TSSOP (thin shrink small-outline) package; "NOPB" means Pb‑free (no lead) / RoHS-compliant finish.