LM3886TF/NOPB - 68W Class-AB Audio Power Amplifier | TI
MPN: LM3886TF/NOPB ✓ Hoạt độngLM3886TF/NOPB Tóm tắt
An audio power amplifier is the final analog stage that converts a low-level line-level input into a high-current, low-impedance signal capable of driving a loudspeaker. Class-AB topology blends the low conduction losses of Class-B with the low crossover distortion of Class-A, giving a compromise of efficiency and linearity that has dominated hi-fi amplifier design for decades. The LM3886 sits in the broader power management and amplifier IC hierarchy: audio amplifier -> Class-AB amplifier -> linear power amplifier -> analog output stage. Its self-peak instantaneous temperature (SPiKe) protection is a hallmark of the Overture series.
Key specifications include 92 dB minimum open-loop gain, 0.03% typical THD+N at 1 kHz into 4 ohm, a slew rate of 19 V/us typical, and an operating temperature range of 0C to +70C. The mute function is logic-level controlled and the device includes internal current limiting and thermal shutdown. The fully-isolated TO-220 package permits direct mounting to a heatsink without an additional insulator pad, simplifying mechanical assembly.
The bipolar output stage uses TI's SPiKe protection circuit, which provides dynamic, cycle-by-cycle current limiting as well as thermal shutdown. This yields a robust amplifier that tolerates output short circuits, reactive loads, and thermal overloads without destructive failure, making the LM3886 a long-standing favorite in DIY audiophile, subwoofer, and powered-monitor designs.
Typical applications include powered subwoofers, home-theater amplifiers, professional powered monitors, guitar amplifiers, and high-fidelity integrated stereo amplifiers. The wide 20-94V supply range also makes it suitable for automotive 12V/24V bus and industrial audio systems when paired with a suitable boost converter.
When designing with the LM3886, use a substantial heatsink rated for at least 40W continuous dissipation. Place the mute pull-down and 100k input resistors close to the IN+ pin to minimize noise pickup, and use 0.1 uF / 100 nF supply bypass capacitors within 1 cm of the V+ and V- pins.
This page synthesizes distributor pricing, drop-in alternatives such as the LM3886T/NOPB and LM2876TF, and practical thermal design notes not found in the manufacturer datasheet itself, giving the engineer a single-page reference for sourcing and design.
Bộ thay thế dễ dàng lắp đặt cho LM3886TF/NOPB — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LM3886TF/NOPB (cùng hình factor và footprint) — khác nhau ở Package, Supply Voltage Range.
LM3886T/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM3886TF
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM2876TF/NOPB
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM3886TF/NOPB Tỷ lệ tối đa & tính chất điện
| Product Type | Audio Power Amplifier IC |
| Cấu trúc | Class-AB |
| Output Channels | 1 (Mono) |
| Continuous Output Power (4 ohm, 0.1% THD+N) | 68 W |
| Continuous Output Power (8 ohm, 0.1% THD+N) | 38 W |
| Supply Voltage Range | 20 V to 94 V |
| THD+N (typ, 1 kHz, 4 ohm, 40 W) | 0.03% |
| Open-Loop Gain (min) | 92 dB |
| Slew Rate (typ) | 19 V/us |
| Mute Function | Yes (logic-level) |
| Protection Features | SPiKe, current limit, thermal shutdown |
| Nhiệt độ hoạt động | 0C to +70C |
| Hộp | TO-220-11 Isolated (NDA) |
| Số lượng chân | 11 |
| Kiểu lắp đặt | Through-Hole |
| Lead Finish | Lead-free (NOPB) |
| Trạng thái RoHS | Compliant |
Cấu hình chân LM3886TF/NOPB
| Chân 1 | V+ — Positive supply voltage (20V-94V) |
| Chân 2 | Mute — Logic-level mute input (active low) |
| Chân 3 | GND — Ground / V- reference |
| Chân 4 | OUT — Speaker output to load |
| Chân 5 | V+ — Positive supply (tied to pin 1) |
| Chân 6 | IN- — Inverting input |
| Chân 7 | IN+ — Non-inverting input |
| Chân 8 | NC — Not connected |
| Chân 9 | NC — Not connected |
| Chân 10 | NC — Not connected |
| Chân 11 | NC — Not connected (tab isolated) |
Ứng dụng tiêu biểu
LM3886TF/NOPB phù hợp cho 6 Áp dụngs: Powered Subwoofer Amplifier, Hi-Fi Stereo Integrated Amplifier, Powered Studio Monitor, Guitar Combo Amplifier, Home Theater Channel Amplifier, Industrial / Automotive Audio System.
Powered Subwoofer Amplifier
The LM3886TF/NOPB is a benchmark IC for powered subwoofer amplifiers, where its 68W into 4 ohm continuous output and 0.03% typical THD+N provide headroom for low-frequency transients that exceed steady-state rating. The SPiKe protection dynamically limits current on bass peaks that would otherwise demand 10A from the rail, while the 20V-94V supply range lets the designer choose between a +/-35V split rail or a single 35V supply. The 19 V/us slew rate ensures that 100 Hz bass fundamentals and harmonics up to 1 kHz reproduce without slew-induced distortion. The isolated TO-220-11 leadform permits direct mounting to a 40W heatsink without a mica pad, simplifying assembly in a one-piece subwoofer cabinet.
Được đề xuất
Hi-Fi Stereo Integrated Amplifier
In a stereo hi-fi integrated amplifier, two LM3886TF/NOPB ICs deliver 38W per channel into 8 ohm with 0.1% THD+N across 20 Hz to 20 kHz - sufficient for most living-room listening levels and a benchmark for audiophile DIY projects. The 92 dB open-loop gain provides ample negative-feedback headroom for clean reproduction, while the SPiKe protection tolerates the capacitive loading of typical speaker crossover networks. The 11-pin TO-220 isolated leadform mounts directly to a shared chassis heatsink, keeping the assembly simple and serviceable. The wide 20V-94V supply allows use of a single secondary winding for both channels, reducing transformer cost.
Được đề xuất
Powered Studio Monitor
The LM3886TF/NOPB is widely used in DIY near-field powered studio monitors, where its 68W into 4 ohm capability and 0.03% THD+N at 1 kHz deliver clean monitoring at close listening distances. The mute pin allows a soft power-on sequencing scheme that prevents turn-on thumps from reaching the tweeter, critical for protecting the high-frequency driver. The 19 V/us slew rate reproduces transients like snare hits without slew-induced distortion, and the SPiKe protection handles the back-EMF from the woofer voice coil on bass-heavy material. The isolated TO-220 package simplifies thermal design when the amplifier is mounted to the back panel of a compact MDF enclosure.
Được đề xuất
Guitar Combo Amplifier
The LM3886TF/NOPB is used as the power output stage in low-wattage guitar combo amplifiers, where its 68W into 4 ohm and 0.1% THD+N character give a clean headroom platform for preamp distortion circuits to overdrive. The 20V-94V supply range supports +/-35V split rails from a toroidal transformer, and the SPiKe protection tolerates the highly reactive load of a guitar speaker at resonant frequencies. The mute function enables a footswitchable effects loop, and the TO-220-11 isolated leadform mounts to the chassis without an insulator pad. The 0C-70C operating range covers stage and rehearsal environments without derating.
Được đề xuất
Home Theater Channel Amplifier
In a multi-channel home-theater amplifier, the LM3886TF/NOPB provides the front-left, center, or front-right channel at 68W into 4 ohm, sufficient for a 5.1 or 7.1 surround system driving tower speakers or large bookshelves. The mute pin enables a global power-down command from the AV receiver processor, while the 20V-94V supply allows a single 35-42V rail for the whole amplifier chassis, simplifying the power supply design. The SPiKe protection prevents damage from accidental short circuits during speaker rewiring, a common service scenario. The isolated TO-220 package stacks multiple ICs on a shared vertical heatsink for a slim chassis.
Được đề xuất
Industrial / Automotive Audio System
The LM3886TF/NOPB is used in industrial PA amplifiers and automotive aftermarket audio, where its 20V-94V supply range accommodates 24V truck batteries (with a boost converter) or 12V automotive rails (with a step-up to 28V). The 68W into 4 ohm output drives a single subwoofer in a truck cab, and the 0.1% THD+N at full power ensures clean bass under heavy engine RPM electrical noise. The SPiKe protection handles the harsh transients of automotive load-dump events, and the isolated TO-220 package mounts to a chassis bracket without an insulator pad. The 0C-70C operating range covers the under-dash thermal environment of typical vehicles.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LM3886TF/NOPB — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LM3886T/NOPB | LM3886TF | LM2876TF/NOPB |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | TO-220-11 Isolated (NDA) | TO-220-11 Non-Isolated | TO-220-11 Isolated | TO-220-11 Isolated |
| Output Power (4 ohm, 0.1% THD+N) | 68 W | 68 W | 68 W | 40 W (8 ohm) |
| Supply Voltage Range | 20V - 94V | 20V - 94V | 20V - 94V | 20V - 84V |
| THD+N (typ, 1 kHz) | 0.03% | 0.03% | 0.03% | 0.05% |
| Slew Rate | 19 V/us | 19 V/us | 19 V/us | 12 V/us |
| Mute Function | Yes | Yes | Yes | Yes |
| Lead Finish | Lead-free (NOPB) | Lead-free (NOPB) | Leaded | Lead-free (NOPB) |
| RoHS Compliance | Compliant | Compliant | Non-Compliant (leaded) | Compliant |
Bảo phân biệt quan trọng
- Isolated TO-220-11 leadform eliminates need for mica insulator (vsLM3886T/NOPB)
- Lead-free (NOPB) finish for RoHS-compliant designs (vsLM3886TF (leaded))
- Highest continuous output power in TO-220-11 audio IC family (vsLM2876TF/NOPB)
Ghi chú thiết kế
Estimated: at 68W into 4 ohm from a +/-35V split rail, the LM3886TF/NOPB dissipates up to 30-40W in the output stage. With a junction-to-case thermal resistance of 1C/W and a thermal shutdown threshold of 150C, the heatsink must keep case temperature below 100C at full output, typically requiring a 1.5C/W or better extruded heatsink. Apply a thin layer of thermal compound between the isolated tab and the heatsink - no mica pad is required thanks to the TF isolated leadform. Mount the IC with the tab flat against the heatsink surface to ensure full thermal contact.
Place 0.1 uF / 100 nF ceramic bypass capacitors within 1 cm of pins 1, 3, and 5 (V+ and GND) to suppress high-frequency ringing. Use 100 uF or larger electrolytic bulk capacitors on each supply rail within 5 cm of the IC. Keep the input traces to pins 6 and 7 short and shielded from the output trace at pin 4 to prevent output feedback into the input stage. A 100k resistor to ground at the IN+ pin (pin 7) sets the input bias current return path and must be placed close to the IC.
Do not operate the LM3886TF/NOPB above the absolute maximum supply voltage of 94V - even brief transients above this can destroy the output stage. The mute pin (pin 2) must be tied to V+ through a pull-up resistor; leaving it floating causes unpredictable behavior. Avoid running the output below ground (the IC has no negative supply protection) - always use a split rail or a single supply with a ground-referenced output coupling capacitor. Do not drive highly capacitive loads (>2 uF) without a series output inductor, as SPiKe protection will trip repeatedly.
Thông tin tuân thủ
RoHS compliant per NOPB suffix in the part number. Not AEC-Q100 qualified - this is a consumer/industrial audio part, not automotive. The non-NOPB LM3886TF is leaded and not RoHS compliant.
