ST TDA7851F 4x48W MOSFET quad bridge power amplifier Data Sheet User Manual

Summary

The TDA7851F is an advanced quad bridge MOSFET power amplifier specifically engineered for high-performance automotive and car radio applications. Designed for maximum durability, it provides robust audio power output coupled with low distortion and comprehensive integrated protections. This datasheet serves as a comprehensive guide for engineers, offering detailed technical specifications, application circuit examples, performance curves (power vs. voltage), and thermal data necessary for seamless system integration into professional car audio equipment.

1 Block diagram and application circuit
- 1.1 Block diagram
  - Figure 1. Block diagram
- 1.2 Application circuit
  - Figure 2. Application circuit
2 Pin description
- 2.1 Pin connection
  - Figure 3. Pin connection (top view)
- 2.2 Thermal data
  - Table 2. Thermal data
3 Electrical specifications
- 3.1 Absolute maximum ratings
  - Table 3. Absolute maximum ratings
- 3.2 Electrical characteristics
  - Table 4. Electrical characteristics (continued)
- 3.3 Electrical characteristics curves
  - Figure 4. Quiescent current vs. supply voltage
  - Figure 5. Output power vs. supply voltage (RL = 4 W)
  - Figure 6. Output power vs. supply voltage (RL = 2 W)
  - Figure 7. Distortion vs. output power (RL = 4 W)
  - Figure 8. Distortion vs. output power (RL = 2 W)
  - Figure 9. Distortion vs. frequency (RL = 4 W)
  - Figure 10. Distortion vs. frequency (RL = 2 W)
  - Figure 11. Crosstalk vs. frequency
  - Figure 12. Supply voltage rejection vs. frequency
  - Figure 13. Output attenuation vs. supply voltage
  - Figure 14. Power dissipation and efficiency vs. output power (RL = 4 W, SINE)
  - Figure 15. Power dissipation and efficiency vs. output power (RL = 2 W, SINE)
  - Figure 16. Power dissipation vs. output power (RL = 4 W, audio program simulation)
  - Figure 17. Power dissipation vs. output power (RL = 2 W, audio program simulation)
  - Figure 18. ITU R-ARM frequency response, weighting filter for transient pop
4 Application hints
- 4.1 SVR
- 4.2 Input stage
- 4.3 Standby and muting
- 4.4 Heatsink definition
5 Package information
- Figure 19. Flexiwatt25 mechanical data and package dimensions
6 Revision history
- Table 5. Document revision history

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Page 1 Text Content

TDA7851F

4 x 48 W MOSFET quad bridge power amplifier

Datasheet − production data

Features Multipower BCD technology High output power capability: 4 x 48 W/4 Ω max. 4 x 28 W/4 Ω @ 14.4 V, 1 k Hz, 10 % 4 x 72 W/2 Ω max. MOSFET output power stage

Excellent 2 Ω driving capability Flexiwatt25

Hi-Fi class distortion Low output noise Standby function Mute function

Fortuitous open GND

Automute at min. supply voltage detection

Reversed battery

Low external component count:

Internally fixed gain (26 d B) No external compensation

Description

No bootstrap capacitors

The TDA7851F is a breakthrough MOSFET

Output DC offset detector

technology class AB audio power amplifier,

Protections:

designed for high-power car radio.

Output short circuit to GND, to Vs, across

The fully complementary P-Channel/N-Channel

the load

output structure allows a rail-to-rail output voltage

Very inductive loads

swing. This, combined with high output current

Overrating chip temperature with soft

and minimized saturation losses, sets new power

thermal limiter

references in the car-radio field, with unparalleled

Load dump voltage distortion performance.

Table 1. Device summary

Order code Package Packing

TDA7851F Flexiwatt25 Tube

June 2012 Doc ID 17714 Rev 2 1/15 This is information on a product in full production. www.st.com

Page Summary Contents For ST TDA7851F 4x48W MOSFET quad bridge power amplifier Data Sheet User Manual

Page 1 TDA7851F 4 x 48 W MOSFET quad bridge power amplifier Datasheet − production data Features Multipower BCD technology High output power capability: 4 x 48 W/4 Ω max. 4 x 28 W/4 Ω @ 14.4 V, 1 k Hz, 10 % ...

Page 2 List of tables TDA7851F List of tables Table 2. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 3. Absolut...

Page 3 TDA7851F List of figures List of figures Figure 1. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 2. App...

Page 4 Contents TDA7851F Contents Block diagram and application circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Page 5 TDA7851F Block diagram and application circuit 1 Block diagram and application circuit 1.1 Block diagram Figure 1. Block diagram 1.2 Application circuit Figure 2. Application circuit Doc ID 17714 Rev ...

Page 6 Pin description TDA7851F 2 Pin description 2.1 Pin connection Figure 3. Pin connection (top view) 2.2 Thermal data Table 2. Thermal data Symbol Parameter Value Unit Rth j-case Thermal resistance junct...

Page 7 TDA7851F Electrical specifications 3 Electrical specifications 3.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit VS Operating supply voltage VS (DC) DC supply ...

Page 8 Electrical specifications TDA7851F Table 4. Electrical characteristics (continued) Symbol Parameter Test condition Min. Typ. Max. Unit THD Distortion Po = 4 W 0.01 0.05 "A" Weighted μV e No ...

Page 9 TDA7851F Electrical specifications 3.3 Electrical characteristics curves Figure 4. Quiescent current vs. supply Figure 5. Output power vs. supply voltage voltage (RL = 4 Ω) Figure 6. Output power vs. ...

Page 10 Electrical specifications TDA7851F Figure 10. Distortion vs. frequency Figure 11. Crosstalk vs. frequency (RL = 2 Ω) Figure 12. Supply voltage rejection vs. Figure 13. Output attenuation vs. supply fr...

Page 11 TDA7851F Electrical specifications Figure 16. Power dissipation vs. output power Figure 17. Power dissipation vs. output power (RL = 4 Ω, audio program simulation) (RL = 2 Ω, audio program simulation)...

Page 12 Application hints TDA7851F 4 Application hints 4.1 SVR Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF time sequence and, consequently, plays an essential r...

Page 13 TDA7851F Package information 5 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmen...

Page 14 Revision history TDA7851F 6 Revision history Table 5. Document revision history Date Revision Changes 09-Jul-2010 Initial release. Updated Features on page 1; 13-Jun-2012 Updated Section 3.2: Electric...

Page 15 TDA7851F Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, cor...

Manual Details

Brand	QUAD
Pages	15
File Size	297.10 KB
Published	June 04, 2026

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Frequently Asked Questions

What is the maximum output power?

The amplifier offers high output power capabilities, including –4 x 48 W/4 Ω max or –4 x 72 W/2 Ω max.

Does it have built-in protections for car use?

Yes, it has several protections including output short circuit detection (to GND, to V, and across load) and an automatic low external component count description.

What voltage levels are supported during startup?

It features auto-mute at minimum supply voltage detection and addresses reversed battery conditions.

Can this amplifier handle low impedance loads?

Yes, it offers excellent 2 Ω driving capability and performs well with very inductive loads due to its high output current.

ST TDA7851F 4x48W MOSFET quad bridge power amplifier Data Sheet User Manual

Summary

Figure 1. Block diagram

Figure 2. Application circuit

Figure 3. Pin connection (top view)

Table 2. Thermal data

Table 3. Absolute maximum ratings

Table 4. Electrical characteristics (continued)

Figure 4. Quiescent current vs. supply voltage

Figure 5. Output power vs. supply voltage (RL = 4 W)

Figure 6. Output power vs. supply voltage (RL = 2 W)

Figure 7. Distortion vs. output power (RL = 4 W)

Figure 8. Distortion vs. output power (RL = 2 W)

Figure 9. Distortion vs. frequency (RL = 4 W)

Figure 10. Distortion vs. frequency (RL = 2 W)

Figure 11. Crosstalk vs. frequency

Figure 12. Supply voltage rejection vs. frequency

Figure 13. Output attenuation vs. supply voltage

Figure 14. Power dissipation and efficiency vs. output power (RL = 4 W, SINE)

Figure 15. Power dissipation and efficiency vs. output power (RL = 2 W, SINE)

Figure 16. Power dissipation vs. output power (RL = 4 W, audio program simulation)

Figure 17. Power dissipation vs. output power (RL = 2 W, audio program simulation)

Figure 18. ITU R-ARM frequency response, weighting filter for transient pop

1 Block diagram and application circuit

1.1 Block diagram

Figure 1. Block diagram

1.2 Application circuit

Figure 2. Application circuit

2 Pin description

2.1 Pin connection

Figure 3. Pin connection (top view)

2.2 Thermal data

Table 2. Thermal data

3 Electrical specifications

3.1 Absolute maximum ratings

Table 3. Absolute maximum ratings

3.2 Electrical characteristics

Table 4. Electrical characteristics (continued)

3.3 Electrical characteristics curves

Figure 4. Quiescent current vs. supply voltage

Figure 5. Output power vs. supply voltage (RL = 4 W)

Figure 6. Output power vs. supply voltage (RL = 2 W)

Figure 7. Distortion vs. output power (RL = 4 W)

Figure 8. Distortion vs. output power (RL = 2 W)

Figure 9. Distortion vs. frequency (RL = 4 W)

Figure 10. Distortion vs. frequency (RL = 2 W)

Figure 11. Crosstalk vs. frequency

Figure 12. Supply voltage rejection vs. frequency

Figure 13. Output attenuation vs. supply voltage

Figure 14. Power dissipation and efficiency vs. output power (RL = 4 W, SINE)

Figure 15. Power dissipation and efficiency vs. output power (RL = 2 W, SINE)

Figure 16. Power dissipation vs. output power (RL = 4 W, audio program simulation)

Figure 17. Power dissipation vs. output power (RL = 2 W, audio program simulation)

Figure 18. ITU R-ARM frequency response, weighting filter for transient pop

4 Application hints

4.1 SVR

4.2 Input stage

4.3 Standby and muting

4.4 Heatsink definition

5 Package information

Figure 19. Flexiwatt25 mechanical data and package dimensions

6 Revision history

Table 5. Document revision history