LM3886TF/NOPB - 68W Class-AB Audio Power Amplifier | TI
부품 번호: LM3886TF/NOPB ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $7.92 | $7.92 |
| 10 | $7.13 | $71.30 |
| 100 | $6.34 | $634.00 |
| 500 | $5.71 | $2,855.00 |
| 1,000 | $5.08 | $5,080.00 |
LM3886TF/NOPB 개요
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.
드롭인 대체품: LM3886TF/NOPB — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: LM3886TF/NOPB (동일 폼 팩터 및 풋프린트) — 차이점: Package, Supply Voltage Range.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
LM3886T/NOPB
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM3886TF
✅ 드롭인✓ 재고 있음
$4.78 / 개
데이터시트 보기 →LM2876TF/NOPB
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LM3886TF/NOPB 최대 정격 & 전기적 특성
| Product Type | Audio Power Amplifier IC |
| 토폴로지 | 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 |
| 동작 온도 | 0C to +70C |
| 패키지 | TO-220-11 Isolated (NDA) |
| 핀 수 | 11 |
| 실장 유형 | Through-Hole |
| Lead Finish | Lead-free (NOPB) |
| RoHS 상태 | Compliant |
LM3886TF/NOPB 핀 구성
| 핀 1 | V+ — Positive supply voltage (20V-94V) |
| 핀 2 | Mute — Logic-level mute input (active low) |
| 핀 3 | GND — Ground / V- reference |
| 핀 4 | OUT — Speaker output to load |
| 핀 5 | V+ — Positive supply (tied to pin 1) |
| 핀 6 | IN- — Inverting input |
| 핀 7 | IN+ — Non-inverting input |
| 핀 8 | NC — Not connected |
| 핀 9 | NC — Not connected |
| 핀 10 | NC — Not connected |
| 핀 11 | NC — Not connected (tab isolated) |
일반적인 애플리케이션
LM3886TF/NOPB 적합 용도: 6 애플리케이션s: 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.
추천
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.
추천
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.
추천
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.
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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.
추천
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.
추천
추천 제품 요약
엔지니어링 참조 데이터: LM3886TF/NOPB — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | 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 |
주요 차별점
- Isolated TO-220-11 leadform eliminates need for mica insulator (vs LM3886T/NOPB)
- Lead-free (NOPB) finish for RoHS-compliant designs (vs LM3886TF (leaded))
- Highest continuous output power in TO-220-11 audio IC family (vs LM2876TF/NOPB)
설계 노트
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.
규정 준수 정보
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.
