LM3886TF - 68W Mono Class-AB Audio Amplifier w/ Mute | Texas Instruments
Référence : LM3886TF ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $7.45 | $7,45 |
| 10 | $6.71 | $67,10 |
| 100 | $5.96 | $596,00 |
| 500 | $5.36 | $2 680,00 |
| 1 000 | $4.78 | $4 780,00 |
LM3886TF Présentation
A Class-AB audio power amplifier is a linear amplifier topology that biases the output stage with a small quiescent current so both transistors conduct at the zero-crossing point, eliminating the crossover distortion of pure Class-B designs while still achieving high efficiency. Within the broader signal-chain taxonomy, the LM3886TF sits as a power-output stage downstream of a pre-amplifier and DAC/ADC, and belongs to the audio amplifier IC family, itself a sub-category of amplifier ICs (signal conditioning > amplifiers > audio amplifiers > power amplifier ICs). The Overture — LM3886 — series is TI's flagship monolithic hi-fi amplifier line.
Key features of the LM3886TF include 0.1% THD+N at full output, 92dB minimum signal-to-noise ratio, 4Ω to 8Ω stable load drive, internal gain of 26dB (user adjustable with two external resistors), and a wide 20V–C to +85C excursion for the mute pin. The TO-220-11 isolated package provides 170°C/W maximum power dissipation. The Overture series signal-to-noise ratio minimum is a key differentiator over competing monolithic audio ICs.
Typical applications include high-power mono subwoofer amplifiers, studio reference monitors, professional PA amplifiers, guitar combo amplifiers, and integrated stereo amplifiers (one LM3886TF per channel). The mute control pin allows use with a microcontroller or DSP interface to enable sequential power-up and standby control.
When designing with the LM3886TF, ensure adequate heat-sinking—the isolated tab simplifies mounting on a chassis-coupled heat sink without requiring an insulating thermal pad (though one is optional). Use a low-impedance ground return, place the input RC network close to the pins, and observe the 94V absolute-maximum supply to avoid SPiKe protection tripping. The mute pin must be either driven high (>90%) or pulled low (<10% static) for proper operation—do not leave it floating or noise above 90 dB SNR will be compromised.
Alternatives de remplacement direct pour LM3886TF — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec LM3886TF (même facteur de forme et même empreinte) — différant par Package, Mounting Type, Operating Temperature, Output Type, Supply Voltage Range.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
LM3886TF/NOPB
✅ Remplacement direct✓ En stock
$5.08 / unité
Voir la fiche technique →LM3886T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM3886T/NOPB
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM3876TF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM2876TF
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
LM3886TF Valeurs maximales et caractéristiques électriques
| Type de sortie | Mono, single channel |
| Topologie | Class-AB |
| Output Power (Continuous Average) | 68 W into 4Ω |
| Output Power (8Ω) | 38 W |
| Supply Voltage Range | 20 V to 94 V (single), ±10 V to ±47 V (split) |
| THD+N | 0.1 % (at full output, 20 Hz–20 kHz) |
| Load Impedance | 4 Ω to 8 Ω |
| Signal-to-Noise Ratio | 92 dB (minimum) |
| Internal Gain | 26 dB (adjustable with external resistors) |
| Mute Pin | Yes (active high) |
| SPiKe Protection | Short-circuit, thermal, over-voltage, under-voltage |
| Plage de température de fonctionnement | 0 °C to +70 °C |
| Boîtier | TO-220-11 Isolated (KC) |
| Type de montage | Through-Hole |
| Nombre de broches | 11 |
Configuration des broches de LM3886TF
| Broche 1 | V+ — Positive supply voltage |
| Broche 2 | GND (Input) — Input ground reference |
| Broche 3 | GND (Tab) — Isolated mounting tab (electrically isolated from die) |
| Broche 4 | Mute — Mute control input (active high) |
| Broche 5 | V+ — Positive supply voltage (must be tied to pin 1) |
| Broche 6 | IN — Audio input |
| Broche 7 | Comp — Compensation node |
| Broche 8 | V- — Negative supply voltage |
| Broche 9 | V- — Negative supply voltage |
| Broche 10 | OUT — Audio output to speaker load |
| Broche 11 | NC — Not connected (per datasheet) |
Applications typiques
LM3886TF convient pour 6 applications: High-Power Mono Subwoofer Amplifier, Studio Reference Monitor, Professional PA / Stage Amplifier, Guitar Combo Amplifier, Integrated Stereo Hi-Fi Amplifier, Home Theater Subwoofer Plate Amplifier.
High-Power Mono Subwoofer Amplifier
The LM3886TF's 68W continuous output into 4Ω at 0.1% THD+N across 20Hz–20kHz makes it an ideal monolithic solution for mono subwoofer amplifier channels. With a single 20V–94V supply (or split ±28V), it can drive an 8Ω subwoofer to 38W clean, or in BTL (bridged) configuration deliver >135W peak into 8Ω. The bipolar output stage's low transient intermodulation (TIM) distortion preserves bass transients. Place the input RC network (typically 1kΩ + 1nF) close to pins 6 and 8, and pair with the TI LM3886 Overture-series reference design.
Recommandé
Studio Reference Monitor
For near-field and main studio reference monitors, the LM3886TF delivers the neutral bipolar sonic signature and 92dB SNR that mastering engineers demand. With ±35V split rails, it cleanly drives 4Ω ribbon tweeters, mid-bass drivers, or full-range studio drivers in the 30W–60W range at <0.05% THD+N. The mute pin enables standby mode for headphone-monitor switching without Overture AIOA oversight. The TO-220-11 Isolated KC package simplifies mounting on the studio monitor's rear-panel heat sink without requiring an insulating thermal washer.
Recommandé
Professional PA / Stage Amplifier
The LM3886TF's 94V absolute-maximum supply rating enables high-power PA amplifier designs for live sound reinforcement. In bridged BTL configuration, two LM3886TF ICs can deliver 135W into 8Ω or 100W into 4Ω with 0.1% THD+N — sufficient for stage monitors, vocal PA cabinets, and instrument amplification. The SPiKe protection (short-circuit, thermal, over-voltage, under-voltage) makes it robust against the inductive kickback of misbehaved venue AC power, while the explicit Overture AIOA protection thresholds are documented.
Recommandé
Guitar Combo Amplifier
The LM3886TF is a popular choice for boutique guitar combo amplifiers, particularly for clean channel power stages. Its bipolar output stage and 92dB SNR preserve the harmonic character of guitar signal pickups without the harshness that DMOS-output amps (TDA7294) can introduce. With a single 48V supply (or ±24V split), 40W+ into 8Ω at 0.05% THD+N is more than adequate for combo amp applications. The dedicated mute pin's channel-select capability is documented at TI's OEM documentation.
Recommandé
Integrated Stereo Hi-Fi Amplifier
Two LM3886TF ICs in a stereo configuration (one per channel) form the output section of integrated hi-fi amplifiers in the 60W–100W per-channel range. With ±35V rails, each channel delivers 60W into 8Ω at 0.05% THD+N — competitive with audiophile-grade Class-AB discrete designs. The Overture series' SPiKe protection enables robust operation with the inductive kickback of misbehaved speaker loads. Use one LM3886TF per channel with the Overture reference design's documented split-supply topology.
Recommandé
Home Theater Subwoofer Plate Amplifier
The LM3886TF is well-suited for active home-theater subwoofer plate amplifiers (the amplifier module mounted on the back of the subwoofer enclosure). With a single 70V supply and a BTL configuration, it delivers 100W+ into 4Ω at 0.5% THD+N — sufficient for 12-inch and 15-inch subwoofer drivers in home theater installations. The TO-220-11 Isolated KC package enables direct mounting on the rear-plate heat sink without thermal isolation hardware, and the mute pin can be driven from the AV receiver's 12V trigger for standby.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM3886TF — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM3886TF/NOPB | LM3886T | LM3886T/NOPB | LM3876TF | LM2876TF |
|---|---|---|---|---|---|---|
| Package | TO-220-11 Isolated (KC) | TO-220-11 Isolated (KC) - same | TO-220-11 (T) Non-Isolated - same pinout | TO-220-11 (T) Non-Isolated - same pinout | TO-220-11 Isolated (KC) - same | TO-220-11 Isolated (KC) - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Power (4Ω, 0.1% THD+N) | 68 W | 68 W | 68 W | 68 W | 56 W (into 8Ω) | 25-40 W range |
| Supply Voltage Range | 20 V to 94 V (single) | 20 V to 94 V | 20 V to 94 V | 20 V to 94 V | 20 V to 94 V (single) | 20 V to 60 V typical |
| Topology | Class-AB | Class-AB | Class-AB | Class-AB | Class-AB | Class-AB |
| Mute Pin | Yes (active high) | Yes | Yes | Yes | Yes | Yes |
| SPiKe Protection | Yes (full) | Yes (full) | Yes (full) | Yes (full) | Yes | Yes (limited) |
| RoHS / Lead-Free | varies (check /NOPB for lead-free) | Yes (lead-free, RoHS) | Varies | Yes (lead-free, RoHS) | Varies | Varies (legacy) |
| Unit Price (qty-1, USD) | 7.45 | 7.45 (DigiKey) | 6.50 typical | 6.50 typical | 5.00 typical | 3.50 typical |
Principaux différenciateurs
- Isolated TO-220-11 KC package eliminates thermal isolation hardware (vs LM3886T (non-isolated TO-220-11))
- Higher output power than LM3876/T LM2876 family in same footprint (vs LM3876TF / LM2876TF)
- Overture-series bipolar output with documented SPiKe protection (vs STMicroelectronics TDA7294 (Multiwatt-15 DMOS))
Notes de conception
Estimated: At ±35V split supply, 8Ω load, 50W output, the LM3886TF dissipates approximately 35W × (1 - 60%) = 14W. The TO-220-11 Isolated KC package has a thermal resistance of approximately 1°C/W junction-to-case; total junction-to-ambient with a properly mounted heat sink (e.g., 2°C/Watt heat sink) is approximately 3°C/W. This results in a 42°C junction temperature rise above 25°C ambient = 67°C junction — below the 150°C thermal shutdown. Designers must use a heat sink with thermal resistance ≤2°C/W for continuous 50W operation. The Overture 5201 reference design provides a documented heat sink baseline.
Place the input RC network (typically 1kΩ resistor + 1µF film capacitor in parallel with a 1kΩ ground-referenced resistor) within 1 inch of pins 6 (IN) and 8 (V-) for optimal noise rejection. The compensation capacitor (pin 7) must be a low-leakage ceramic or film type rated for the supply voltage. Place bypass capacitors (0.1µF + 100µF electrolytic) close to pins 1/5 (V+) and 8/9 (V-). The mute pin (pin 4) requires either a logic drive or a pull-up/pull-down resistor to a defined logic state — floating it above 70% will leave it in undefined state and degrade SNR.
Critical pitfalls to avoid: (1) Do not exceed 94V total supply — SPiKe protection will trip and cause output shutdown; (2) Do not leave the mute pin floating — drive it high (>2.5V) for normal operation or low (<0.5V) for muted; (3) For LM3886TF, tie V+ to BOTH pin 1 and pin 5 (LM3876 only requires pin 1) — omitting the pin 5 V+ connection will cause high distortion; (4) Do not use an inductive speaker load below 4Ω without SPiKe protection analysis; (5) Observe the 0°C to +70°C commercial temperature range — for industrial applications, ensure adequate heat sinking. The TI E2E community threads document these as the most common LM3886 application issues.
Use a star-ground topology with the input ground (pin 2) returning to a single point near the input RC network, separate from the power ground (pin 8/9). Keep the output trace (pin 10) short and direct to the speaker terminal — long output traces pick up EMI and degrade damping factor. Route the supply traces (pins 1/5, 8/9) with wide copper pours to minimize voltage drop and improve SPiKe protection response. Place the heat sink mounting tab connection to a chassis ground via a low-inductance path (short wire or screw terminal) to avoid ground loops.
Informations de conformité
RoHS and REACH compliance per TI product page (LM3886TF/NOPB is lead-free RoHS; older non-NOPB variants may be leaded). Halogen-free per TI's LM3886 product family datasheet. Not AEC-Q100 qualified — LM3886 is commercial/industrial grade only. For automotive audio amplifier applications, consider the TAS5421-Q1 or TPA3116-Q1 instead.
