NXP Semiconductors TDA6120Q/N2,112

Overview

TDA6120Q/N2,112 from NXP Semiconductors (formerly Philips) is a high-voltage video output amplifier IC designed for CRT cathode drive in HDTV and monitor applications. It delivers 125 V (p-p) large-signal output with 32 MHz bandwidth, 10 V/ns slew rate, and differential voltage input - enabling precise, high-fidelity video signal amplification in analog display systems.

For engineers reviewing the TDA6120Q/N2,112 datasheet, TDA6120Q/N2,112 pinout, TDA6120Q/N2,112 application, or TDA6120Q/N2,112 equivalent, key selection criteria include high-voltage DC output stability (85–120 V), cathode current measurement capability (OUTM pin), flashover-protected CRT interface design, and dual-supply operation (12 V / 200 V).

Technical Context

The TDA6120Q/N2,112 employs high-voltage DMOS technology to achieve stable 200 V rail operation and fast cathode current feedback via dedicated OUTM pin. Its internal gain of 1.68–2.08 supports configurable system gain through external feedback networks, while bandwidth remains independent of voltage gain setting.

It integrates switch-off logic triggered at VCC < 8.8 V, pulling OUT and OUTC to VDD during fault conditions. The device features separate pre-emphasis input networks (RC−/RC+) and differential voltage inputs (VIN−/VIN+), supporting optimized transient response for composite video signals driving CRT electron guns.

Key Specifications

Pinout & Package

Package: DBS13P - plastic DIL-bent-SIL power package, 13 leads, SOT141-8 outline, lead length 7.7 mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar video output amplifier applications.

Compared with TDA6120Q/N2,112, the TDA6103Q/N2,112 offers reduced integration and bandwidth but lower cost, while LA7845N provides higher output current capability at the expense of precision feedback and thermal efficiency - making TDA6120Q/N2,112 optimal for high-fidelity, closed-loop CRT systems.

Availability

TDA6120Q/N2,112 is available at Aetrix Electronics and suitable for HD CRT television manufacturing, professional broadcast monitor production, and legacy medical imaging display systems requiring stable component supply and long-lifecycle support.

Supply support for TDA6120Q/N2,112 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

NXP Semiconductors is a global semiconductor company formed from the spin-off of Philips Semiconductors in 2006, specializing in high-performance analog, RF, and mixed-signal solutions.

The TDA6120Q/N2,112 belongs to NXP's legacy video interface product line, engineered specifically for analog CRT cathode drive in high-definition television and professional display equipment - emphasizing high-voltage stability, fast transient response, and integrated dark current control.

FAQ

What is the maximum safe operating voltage for the TDA6120Q/N2,112 high-side supply?

The TDA6120Q/N2,112 supports a maximum high supply voltage (VDD) of 280 V per absolute maximum ratings. However, the recommended operating range is 180–210 V for reliable long-term performance. Operation above 210 V increases thermal stress and reduces lifetime, especially without adequate heatsinking - the device's thermal resistance is 3.0 K/W junction-to-case, so proper PCB copper area and heatsink contact are essential when approaching 280 V limits. Always verify VDD derating per Fig.4 under actual ambient conditions.

Does the TDA6120Q/N2,112 support DC-coupled CRT cathode drive?

Yes, the TDA6120Q/N2,112 supports true DC-coupled cathode drive with a DC output voltage range of 85–120 V (typ.) at pins 12 and 13. Its internal architecture maintains DC stability across temperature (−25 mV/K drift) and load, enabling precise black-level control without AC coupling capacitors that degrade low-frequency response. This is critical for maintaining grayscale accuracy in medical and broadcast CRT applications where DC offset directly affects luminance fidelity.

How does the OUTM pin function in dark current control loops?

The OUTM pin on the TDA6120Q/N2,112 provides a fast, linear voltage representation of cathode current (3–16.5 V range), with linearity better than 1.0 over ±50 µA input current. It acts as a dedicated current-sense output - not a buffered copy - enabling direct connection to an external op-amp integrator for closed-loop dark current regulation. Its 0–30 µA offset and <10 ns propagation delay allow real-time correction of CRT emission drift, improving black-level stability across tube life and temperature.

Can the TDA6120Q/N2,112 be used with modern flat-panel displays?

No, the TDA6120Q/N2,112 is specifically designed for analog CRT cathode drive and is not compatible with LCD, OLED, or plasma displays. Its 200 V output swing, flashover protection interface, and cathode current measurement functionality have no functional equivalent in flat-panel timing controllers or source drivers. Using it outside CRT applications risks damage due to mismatched voltage levels, load impedance, and signal format - it lacks LVDS, TTL, or MIPI interfaces required by modern panels.

What external components are mandatory for safe operation of the TDA6120Q/N2,112?

Mandatory external components for the TDA6120Q/N2,112 include: (1) a >100 nF high-frequency capacitor between VDD (pin 10) and GND (pin 8), placed within 5 mm; (2) a 10 µF bulk capacitor on the CRT base PCB; (3) a 50 Ω series resistor plus external protection diode for CRT flashover suppression; and (4) a 147 Ω carbon HV resistor with 2 kV spark gap between cathode and ground. Omitting any compromises safety, thermal performance, or signal integrity - especially the VDD-GND decoupling, which prevents oscillation and voltage spikes.