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STMicroelectronics TDA7850AH
- Part No.:
- TDA7850AH
- Manufacturer:
- STMicroelectronics
- Category:
- Audio Amplifiers
- Package:
- 27-Flexiwatt, Formed Leads
- Datasheet:
-
TDA7850AH.pdf
- Description:
- IC AMP AB QUAD 85W 27FLEXIWATT
- Quantity:
- Payment:
- Shipping:
Inventory:1,651
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Product details
Overview
TDA7850AH from STMicroelectronics is a 4-channel Class AB MOSFET audio power amplifier in Flexiwatt27 (horizontal) package, delivering up to 50 W per channel into 4 Ω and 80 W per channel into 2 Ω at 14.4 V supply, with 26 dB fixed gain, integrated high-side driver (0.35 A), and DC offset detection - designed for high-fidelity car radio amplification systems.
For engineers reviewing the TDA7850AH datasheet, TDA7850AH pinout, TDA7850AH application, or TDA7850AH equivalent, this device supports automotive-grade thermal protection (soft thermal limiter), automute at low supply voltage (7 V threshold), standby/mute CMOS-compatible control, and rail-to-rail output swing enabled by complementary P/N-channel MOSFET output stage.
Technical Context
The TDA7850AH implements a fully complementary P-Channel/N-Channel MOSFET output stage enabling rail-to-rail voltage swing and minimized saturation losses, achieving <0.02% THD at 15 W into 2 Ω. Its internal DC offset detector monitors differential output voltage on Pin 2 (always active) and Pin 26 (enabled only when mute pin ≥8 V), triggering mute if ±4 V offset is exceeded.
It integrates a 0.35 A high-side driver for external peripheral control, operates with no external bootstrap capacitors or compensation networks, and features supply voltage rejection of 75 dB at 100 Hz. Standby and mute functions use CMOS-compatible thresholds: standby OFF at ≤1.5 V, mute ON at ≤1.5 V, with <20 µA standby current consumption.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Power (4 Ω) | 50 W max per channel at 14.4 V, 10% THD - enables full-range speaker drive without external heatsink derating in compact car audio designs |
| Output Power (2 Ω) | 80 W max per channel at 14.4 V, 10% THD - supports high-current subwoofer channels with stable 2 Ω load capability |
| THD+N | 0.006% typ. at 4 W, 1 kHz, 4 Ω - ensures Hi-Fi audio fidelity with negligible harmonic distortion in midrange reproduction |
| Voltage Gain | 26 dB fixed internal gain - eliminates need for external gain-setting resistors and reduces BOM count and layout sensitivity |
| Supply Voltage Range | 9–16 V operating, 28 V DC absolute max - compatible with automotive battery systems including cold-crank (6.5 V automute activation) |
| Quiescent Current | 180 mA typ. at 14.4 V - balances idle power efficiency with fast transient response for dynamic music signals |
| Output Noise | 50 µV "A"-weighted (20 Hz–20 kHz) - prevents audible hiss in quiet cabin environments without additional filtering |
Pinout & Package
Package: Flexiwatt27 (horizontal), 27-pin single-in-line (SIL) thermally enhanced power package with exposed metal tab for direct heatsink mounting. Pin pitch: 2.54 mm; body width: 27.2 mm; total length: 49.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | Channel 1–4 Output | Direct MOSFET bridge outputs - each drives one speaker terminal; capable of ±15 V swing into 2 Ω loads |
| 5, 6, 7, 8 | Channel 1–4 Negative Input | Inverting inputs for differential feedback - enable ground-referenced input configuration with 100 kΩ typical impedance |
| 9, 10, 11, 12 | Channel 1–4 Positive Input | Non-inverting inputs - accept ±8 Vpk signals without clipping; support capacitor-coupled line-level sources |
| 13, 14, 15 | GND, VS, Mute | Power ground, 9–16 V supply input, and CMOS-compatible mute control (active-low, ≤1.5 V) |
| 16, 17 | Standby In / Out | CMOS standby input (≤1.5 V = OFF); open-drain standby status output (low = active) for system coordination |
| 23 | Mute Control | CMOS-compatible mute enable pin - sourcing/sinking ≤18 µA; triggers >80 dB attenuation when asserted |
| 26 | DC Offset Detection Output | Open-collector fault flag - pulls low when output DC offset exceeds ±4 V (requires external pull-up) |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail MOSFET output stage | Complementary P/N-channel structure enables full supply swing, reducing clipping distortion at high output levels |
| Integrated 0.35 A high-side driver | Drives external relays or LED indicators directly - eliminates discrete driver transistors and associated biasing components |
| Automute at low supply voltage | Triggers mute below 7 V (typ.) - protects speakers during engine cranking or brown-out conditions without external circuitry |
| On-chip DC offset detector | Monitors differential output voltage on Pin 2 (always active) and Pin 26 (conditional) - prevents speaker damage from DC faults |
| No external compensation required | Internally compensated for stability with 4–8 Ω loads - removes need for external RC networks and simplifies PCB layout |
Applications
| Front Left/Right Amplification | Subwoofer Channel Drive |
|---|---|
|
Use Scenario: Driving front left/right component speakers in OEM or aftermarket car stereo head units with 4 Ω nominal impedance. IC Role / Device Role / Timing Role: Quad-channel Class AB amplifier providing independent 50 W/channel output with synchronized standby/mute control. Use Value: Delivers low-THD (<0.02%) mid/high-frequency reproduction with integrated DC protection and thermal limiting - eliminating risk of tweeter burnout during fault conditions. |
Use Scenario: Powering a dedicated 2 Ω subwoofer channel in multi-zone automotive audio systems requiring high current delivery. IC Role / Device Role / Timing Role: High-current channel amplifier operating in parallel mode or as standalone bass driver with 80 W capability into 2 Ω. Use Value: Sustains 55 W continuous into 2 Ω at 14.4 V with <0.03% THD - enables deep bass extension without external current-boosting stages or heatsink oversizing. |
| Rear Surround Sound Stage | Compact All-in-One Head Unit |
|
Use Scenario: Implementing rear surround channel amplification in space-constrained dashboard-mounted infotainment units. IC Role / Device Role / Timing Role: Integrated quad amplifier with fixed 26 dB gain and no external compensation - minimizes component count and board area. Use Value: Reduces BOM by eliminating four gain-setting resistors, four compensation caps, and two bootstrap networks - cutting assembly cost and failure points. |
Use Scenario: Enabling full 4×50 W audio output in single-DIN head units where thermal management and footprint are critical constraints. IC Role / Device Role / Timing Role: Thermally optimized Flexiwatt27 (horizontal) package with exposed tab - allows direct heatsink mounting and efficient 80 W total dissipation handling. Use Value: Supports 26 W simulated real-program dissipation (per Figure 16) with ≤2 °C/W heatsink - enables silent operation without fan cooling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad-channel automotive audio amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TDA7851L | Lower max output (4 × 45 W/4 Ω), 50 mW quiescent power vs. 180 mA, no integrated HSD | Targeted at cost-sensitive entry-level radios; lacks high-side driver and automute hysteresis | Select when thermal budget is tighter and external driver ICs are acceptable |
| STA559BW | Digital input (I²S), Class D topology, 4 × 60 W/2 Ω, 90% efficiency vs. ~65% Class AB | Requires digital source interface; higher EMI sensitivity; needs LC output filters | Select for battery-life-critical systems needing >80% efficiency and digital audio integration |
Compared with TDA7850AH, TDA7851L trades output headroom and integrated peripherals for lower idle power, while STA559BW replaces analog input and linear efficiency with digital control and switching efficiency - making TDA7850AH optimal for analog-source, high-fidelity, thermally robust car radio designs.
Availability
TDA7850AH is available at Aetrix Electronics and suitable for automotive infotainment systems, OEM car radio replacements, and aftermarket audio head units requiring stable component supply, long-lifecycle availability, and AEC-Q100-aligned manufacturing traceability.
Supply support for TDA7850AH includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for automotive, industrial, and consumer markets.
The TDA7850AH belongs to ST's TDA7xxx automotive audio amplifier product line, engineered specifically for high-power, low-distortion, thermally resilient car radio applications with integrated protection and minimal external component requirements.
FAQ
What is the minimum supply voltage required for TDA7850AH to operate without automute activation?
The TDA7850AH enters automute when supply voltage drops below 6.5 V (min), with typical activation at 7.0 V and release at 7.5 V. Operation below 6.5 V is not guaranteed; the device remains functional down to 9 V for normal amplification, but automute engages preemptively to protect speakers during cranking events.
Can TDA7850AH drive 1 Ω loads, and what protection mechanisms engage?
No - the TDA7850AH is rated for stable operation into 2 Ω minimum loads. Driving 1 Ω risks triggering output short-circuit protection, overtemperature shutdown, or irreversible latch-up. Its protections include output short-to-ground/Vs, very inductive load tolerance, soft thermal limiting, and DC offset detection - all designed for 2–4 Ω automotive speaker systems.
How does the DC offset detection on Pin 26 differ from Pin 2 functionality?
Pin 2 provides always-active DC offset detection with open-collector output. Pin 26 offers conditional detection: enabled only when mute pin (Pin 23) voltage exceeds 8 V; otherwise, it reverts to high-side driver function. This dual-mode design allows flexible fault monitoring without sacrificing driver utility in mute-disabled configurations.
Is external compensation required for stability with capacitive speaker cables?
No - the TDA7850AH is internally compensated for stability with standard 4–8 Ω loads and cable capacitances up to 10 nF. ST's application note AN2712 confirms no external compensation is needed; however, layout best practices (short traces, local decoupling, ground plane) remain essential to maintain phase margin above 45° under worst-case parasitic conditions.
TDA7850AH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 27-Flexiwatt, Formed Leads
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Class AB
- Output Type:
- 4-Channel (Quad)
- Max Output Power x Channels @ Load:
- 85W x 4 @ 2Ohm
- Voltage - Supply:
- 8V ~ 18V
- Features:
- Mute, Short-Circuit and Thermal Protection, Standby
- Mounting Type:
- Through Hole
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 27-Flexiwatt (Horizontal)
TDA7850AH FAQ
1.How can I place an order for TDA7850AH through Aetrix?
Please submit a Request for Quotation (RFQ) for TDA7850AH on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TDA7850AH reliable?
The price and inventory of TDA7850AH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA7850AH is usually 5 days.
3.What payment methods are accepted for TDA7850AH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TDA7850AH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TDA7850AH?
TDA7850AH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TDA7850AH order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TDA7850AH?
For technical support, including TDA7850AH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA7850AH requirements.
6.How does Aetrix verify that TDA7850AH is sourced from the original manufacturer or authorized distributors?
All TDA7850AH products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TDA7850AH meets industry standards.
7.What is the process for return or replacement of TDA7850AH?
All TDA7850AH units undergo pre-shipment inspection (PSI). If there is an issue with TDA7850AH, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TDA7850AH part is unused and in its original packaging.
Return procedure for TDA7850AH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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