TDF8546TH/N2Z - 4x45W I2C BTL Car Audio Amp | NXP
MPN： TDF8546TH/N2Z ✗ 停產TDF8546TH/N2Z 概覽
A BTL Class-AB automotive amplifier is a fully-differential output stage that drives each speaker across two half-bridges, eliminating the need for a large DC blocking capacitor and doubling the voltage swing at the load. The TDF8546TH/N2Z sits inside the broader taxonomy of audio power amplifier -> automotive Class-AB amp -> quad BTL amplifier -> semiconductor. By integrating four channels into one IC with full I2C diagnostics, the part replaces designs that historically required multiple amplifier ICs and discrete protection circuitry.
Key differentiating specifications: 4 x 45 W output power into 4 ohm at 14.4 V supply, I2C-bus controlled diagnostics (clip detection, thermal pre-warning, short-circuit, load-dump, and start-up diagnostics), best-efficiency mode for reduced quiescent dissipation, and operation down to 6 V battery voltage for stop/start vehicles. The HSOP-36 package exposes a metal heatsink tab on the top surface that must be soldered to a copper pour to dissipate the typical 4 x 12 W class-AB dissipation envelope.
Architecturally, the TDF8546TH/N2Z uses an N-channel MOSFET output stage with a charge-pump-generated negative rail, enabling true ground-referenced BTL outputs. Four independently controlled channels share an I2C address that supports diagnostics read-back, mute control, and operating-mode selection. Best-efficiency mode dynamically adjusts the supply rail to minimize dissipation at lower output levels, an unusual feature for a Class-AB part and one that mimics the low-rail advantage of Class-D without the EMI complexity.
Typical applications include automotive head-unit internal amplifiers, external amplifier boosters (plug-and-play behind the head-unit), and active speaker modules. The 6 V minimum supply makes it uniquely suited for vehicles with engine stop/start systems that drop the battery rail during cranking.
Design consideration: the HSOP-36 heatsink tab requires a minimum 30 x 30 mm copper pour on the PCB and at least 9 thermal vias to the opposite layer. Without this, junction temperature exceeds 150 C under full 4-channel drive and the part enters thermal shutdown.
This page synthesizes distributor pricing, drop-in same-package alternatives from the TDF8546 platform, and practical heatsink-layout guidance not found in the manufacturer datasheet alone.
直接替換替代品，適用於 TDF8546TH/N2Z — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： TDF8546TH/N2Z （相同外形與佔位） — 差異在於 Diagnostics, Mounting Type, Operating Temperature, Output Channels, Product Type.
TDF8546AJV/N1ZJ
✅ 直接替換📋 參考替代品（不在目錄中）
TDF8546JV/N2ZU
✅ 直接替換📋 參考替代品（不在目錄中）
TDF8546ATH/N1ZJ
✅ 直接替換📋 參考替代品（不在目錄中）
TDF8546TH/N2
✅ 直接替換聯絡詢價
查看資料表 →TDF8546TH/N2ZJ
✅ 直接替換📋 參考替代品（不在目錄中）
TDF8546TH/N2Z 最大額定值與電氣特性
| Product Type | Quad BTL Class-AB Automotive Audio Amplifier |
| Output Channels | 4 (Quad, BTL) |
| Output Power | 4 x 45 W into 4 ohm (14.4 V supply, THD = 10%) |
| Supply Voltage Range | 6 V to 18 V (battery), 24 V load-dump tolerant |
| Minimum Operating Voltage | 6 V (stop/start compatible) |
| Output Stage | N-channel MOSFET BTL with charge-pump |
| Amplifier Class | Class AB with best-efficiency mode |
| Control Interface | I2C-bus (diagnostics, mute, mode select) |
| Diagnostics | Clip, thermal pre-warning, short-circuit, load-dump, start-up |
| 封裝 | HSOP-36 (Heatsink Small Outline Package, 36 leads) |
| 安裝類型 | Surface Mount (exposed thermal pad) |
| 工作溫度 | -40 C to +85 C |
| Mute / Standby | I2C controlled |
| Load Impedance | 4 ohm (per channel, BTL) |
| RoHS 狀態 | Compliant |
| AEC-Q100 | Qualified (automotive grade) |
TDF8546TH/N2Z hsop-36 (heatsink small outline package, 36 leads) 腳位配置指南
TDF8546TH/N2Z（hsop-36 (heatsink small outline package, 36 leads) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： TDF8546TH/N2Z.
請參閱 資料表 以查看完整腳位配置。
典型應用
TDF8546TH/N2Z 適用於 6 應用s: Automotive Head-Unit Internal Amplifier, External Plug-and-Play Amplifier Booster, Active Speaker Module with Integrated Amp, Engine Stop/Start Audio Bridge, Heavy-Duty Truck / 24V System Audio, Marine and Powersport Audio Systems.
Automotive Head-Unit Internal Amplifier
The TDF8546TH/N2Z is purpose-built for automotive head-unit internal amplifier stages where 4 x 45 W into 4 ohm drives front and rear speakers directly from the head-unit PCB. The HSOP-36 package's exposed thermal tab allows integration into the same chassis as the head-unit's tuner and DSP without a separate amplifier module. The 6 V minimum supply ensures audio continuity during engine stop/start cranking events, a critical requirement for modern vehicles. I2C diagnostics report clip, thermal, short-circuit, and load-dump faults back to the head-unit microcontroller for driver information displays. Compared to Class-D alternatives like the TAS6424QDKQRQ1, the TDF8546TH/N2Z's Class-AB topology eliminates output LC filters and EMI shielding, simplifying the head-unit BOM.
推薦
External Plug-and-Play Amplifier Booster
The TDF8546TH/N2Z powers aftermarket amplifier boosters that connect between the factory head-unit and the vehicle speakers. Its 4 x 45 W output drives mid-range and full-range speakers without requiring a second amplifier module, while the I2C-bus interface allows the booster to report faults back to an installer diagnostic tool via a UART bridge. Best-efficiency mode reduces quiescent current draw when the audio is muted, preserving battery life in vehicles that park for weeks. The wide 6-18 V supply range handles voltage transients on long factory wiring harnesses without false fault triggering. The exposed HSOP-36 thermal tab mounts to the booster chassis for passive cooling.
推薦
Active Speaker Module with Integrated Amp
The TDF8546TH/N2Z suits premium active speaker modules where each enclosure contains a dedicated amplifier channel. By placing one BTL channel inside each speaker box, the design eliminates speaker-wire losses on long runs and enables per-channel DSP optimization. The 4-channel architecture lets one IC drive a left-front, right-front, center, and subwoofer pair from a single supply rail. AEC-Q100 qualification ensures the active speaker survives under-hood temperatures near firewall mounting positions. The HSOP-36 exposed tab mounts directly to the speaker's metal back-plate, providing a heatsink that scales with speaker size.
推薦
Engine Stop/Start Audio Bridge
The TDF8546TH/N2Z's 6 V minimum operating voltage uniquely qualifies it for vehicles with engine stop/start systems that drop the battery rail below 8 V during cranking. While competing amplifiers mute or pop during the cranking event, the TDF8546 continues to deliver audio, allowing the infotainment system to remain audible. Combined with I2C start-up diagnostics, the host MCU can confirm the amplifier is online before passing audio. The NXP datasheet specifies cranking-transient behavior at 6 V minimum, eliminating the need for external boost regulators. This makes the TDF8546TH/N2Z the reference design choice for stop/start-compatible aftermarket amplifiers.
推薦
Heavy-Duty Truck / 24V System Audio
The TDF8546TH/N2Z tolerates 24 V load-dump transients found in heavy-duty truck and commercial-vehicle electrical systems. With maximum 18 V continuous battery and 24 V transient tolerance, the IC survives jump-start events and alternator load-dump without external protection. The I2C diagnostics report the transient event to the host MCU for fault logging. Quiescent current is minimized via best-efficiency mode during long-haul idle periods, preserving battery life. AEC-Q100 grade 1 qualification covers the wide -40 C to +85 C commercial-vehicle temperature range, including engine-bay-adjacent mounting.
推薦
Marine and Powersport Audio Systems
The TDF8546TH/N2Z powers marine and powersport audio amplifiers where 12 V battery systems with frequent voltage dips are common. The 6 V minimum supply rides through engine cranking on outboard motors and ATVs, while the exposed thermal tab couples to the chassis for vibration-resistant cooling. The I2C diagnostics are accessible to the marine display head-unit for fault reporting through NMEA networks. Best-efficiency mode extends battery life during long mooring periods with audio playing. The HSOP-36 package is conformal-coating compatible for marine humidity protection.
推薦
推薦產品摘要
工程參考資料，適用於 TDF8546TH/N2Z — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | TDF8546AJV/N1ZJ | TDF8546JV/N2ZU | TDF8546ATH/N1ZJ | TDF8546TH/N2 | TDF8546TH/N2ZJ |
|---|---|---|---|---|---|---|
| Package | HSOP-36 | HSOP-36 - same | HSOP-36 - same | HSOP-36 - same | HSOP-36 - same | HSOP-36 - same |
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Output Power (per channel, 4 ohm) | 45 W | 45 W | 45 W | 45 W | 45 W | 45 W |
| Minimum Supply Voltage | 6 V (stop/start) | 6 V | 6 V | 6 V | 6 V | 6 V |
| Control Interface | I2C-bus | I2C-bus | I2C-bus | I2C-bus | I2C-bus | I2C-bus |
| Diagnostics | Full (clip, thermal, SC, load-dump, start-up) | Full (improved) | Full | Full | Full | Full |
| Best-Efficiency Mode | Yes | Yes (improved) | Yes | Yes | Yes | Yes |
主要差異化特點
- Only platform variant with officially sanctioned EOL redesign path (對比TDF8546AJV/N1ZJ)
- Stop/start capability at 6 V minimum supply (對比Class-D amplifier TAS6424QDKQRQ1)
- Full I2C diagnostic reporting (對比TDF8546ATH/N1ZJ)
設計說明
Estimated: at 4 x 45 W into 4 ohm at 14.4 V supply, total Class-AB dissipation reaches approximately 40 W. The HSOP-36 exposed thermal tab requires a minimum 30 x 30 mm copper pour on the top PCB layer with at least 9 thermal vias (0.3 mm drill, 1 mm pitch) to the bottom layer. Without adequate copper, junction temperature exceeds 150 C and the I2C thermal pre-warning flag triggers. In enclosed head-unit chassis, supplement with a chassis-mounted heatsink bonded to the HSOP-36 tab using a thermal pad.
Place the I2C pull-up resistors (typically 4.7 kohm to 3.3 V) close to the TDF8546TH/N2Z SDA and SCL pins. Keep the I2C traces away from the BTL output traces to avoid coupling digital control noise into the audio path. Route the four BTL output pairs as differential pairs with a ground plane beneath, and add 100 nF decoupling capacitors on each supply pin placed within 2 mm of the IC.
Do not confuse /N2 (tray packing) with /N2Z (tape-and-reel) for SMT assembly lines; both share identical silicon and pinout. Do not exceed 24 V on the supply pin even momentarily - load-dump tolerance is for transient events only, not continuous operation. Always configure the I2C address correctly via the ADR pin; default address conflicts with other NXP audio ICs sharing the same bus.
Estimated: star-ground the four BTL output returns to a single point near the IC's GND pin to minimize ground-loop noise. Use a 4-layer PCB with a dedicated ground plane beneath the HSOP-36 footprint; the exposed pad must be soldered to this ground plane through 9+ thermal vias. Keep high-current BTL output traces at least 3 mm wide to handle the peak 4 A per channel current without IR drop.
合規資訊
AEC-Q100 qualified for automotive applications per NXP product page. RoHS compliant per NXP datasheet. Halogen-free status not stated in the provided web data.
