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Home > Products > Integrated Circuits (ICs) > Linear > Video Processing

STMicroelectronics TDA8145

Name: TDA8145
Brand: STMicroelectronics
SKU: TDA8145
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TDA8145

Manufacturer:: STMicroelectronics

Category:: Video Processing

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: TDA8145.pdf

Description:: IC VIDEO EAST/W CORRECT 8PWRDIP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

TDA8145 from STMicroelectronics is a monolithic TV east-west pin-cushion correction IC for square CRT displays, implementing parabolic current generation, keystone adjustment, dynamic field correction input, static width control, and Class-D final stage with energy redelivery. It drives diode modulators in analog TV and monitor deflection circuits at 26 V supply with 7 mA typical supply current and 8.0 V internal reference.

For engineers reviewing the TDA8145 datasheet, TDA8145 pinout, TDA8145 application, or TDA8145 equivalent, this page provides verified functional context, absolute maximum ratings (35 V supply, 500 mA supply current), thermal resistance data (70 °C/W junction-to-pin), parabola coefficient values (K1 = 0.26, K2 = 0.70), and real-world circuit operation details including flyback parasitic suppression.

Technical Context

The TDA8145 integrates three core functional blocks: a differential amplifier (OP1) biased by vertical sawtooth current (±33 µA) and adjustable DC reference for keystone correction; a rectified parabola network generating parabolic output current; and a comparator (OP2) comparing that current against horizontal sawtooth voltage for pulse-width modulation.

Its Class-D push-pull final stage delivers up to 400 mA sink current (VSATL ≤ 2 V) and 100 mA source current (VSATH ≤ 1.5 V) to drive external inductors connected to diode modulators, while internal current limiting (40 µA max) suppresses parasitic parabola during vertical flyback.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage	17–30 V - supports standard CRT deflection supply rails; absolute max 35 V prevents latch-up under transient overvoltage.
Internal Reference Voltage	7.6–8.8 V - stable bias for keystone and width adjustment circuitry; typ. 8.0 V enables precise DC level setting.
Parabola Coefficient K1	0.26 - defines linear term of parabolic correction curve; sets baseline horizontal linearity across screen center.
Parabola Coefficient K2	0.70 - defines quadratic term; determines curvature strength for corner pin-cushion compensation.
Sink Saturation Voltage	≤2 V @ 400 mA - ensures low-loss drive into diode modulator load during active scan period.
Source Saturation Voltage	≤1.5 V @ 100 mA - maintains efficient Class-D switching in sourcing phase without excessive heat dissipation.
Thermal Resistance j-pin	Max 70 °C/W - enables reliable operation at Tamb = 50°C with 500 mW power dissipation limit.

Pinout & Package

Package: POWERDIP8 (8-pin plastic dual in-line), 9.8 mm × 8.8 mm body, 2.54 mm lead pitch, operating temperature range 0 to 70 °C.

Pin/Terminal	Circuit Role	Design Meaning
1	KEYSTONE CORRECTION INPUT	Adjustable DC bias input to OP1 non-inverting input; sets symmetry point of parabola for trapezoidal (keystone) correction.
2	FRAME SAWTOOTH CURRENT INPUT	Receives ±33 µA vertical frequency sawtooth current via external resistor; drives differential amplifier OP1.
3	CURRENT REFERENCE	100 µA current sink; used for external current mirror or biasing; referenced to internal 8 V reference.
4	GND	Analog ground reference for all internal amplifiers and comparators; must be low-impedance connection.
5	NON-INVERTING INPUT	Input to OP1 amplifier; connected to keystone-adjustable DC reference; forms error amplifier for vertical correction loop.
6	INVERTING INPUT	Inverting input to OP1; driven by frame sawtooth current; establishes differential input for parabola generation.
7	PARABOLA OUTPUT	Voltage output proportional to parabolic current; drives external resistor to generate correction waveform for diode modulator.
8	+VS	Positive supply rail (17–30 V); powers all internal stages including Class-D output driver and reference circuitry.

Key Features

Feature	Design Value
Class-D final stage with energy redelivery	Reduces power dissipation by recycling reactive energy from inductive load during switching transitions.
Parasitic parabola suppression	Internal 40 µA current limit activates during vertical flyback to eliminate unwanted curvature artifacts in retrace interval.
External keystone adjustment	Pin 1 accepts variable DC voltage to shift parabola symmetry point, correcting trapezoidal distortion on square CRTs.
Pulse-width modulated horizontal drive	Comparator OP2 generates PWM signal synchronized to horizontal frequency, enabling precise timing-controlled deflection modulation.
Static picture width control	DC level on horizontal sawtooth input adjusts duty cycle of PWM output, directly scaling horizontal scan amplitude.

Applications

TV CRT Deflection Control

Monitor CRT Geometry Correction

Use Scenario: Analog television receivers using square-tube CRTs requiring precise east-west pin-cushion correction across full screen height.

IC Role / Device Role / Timing Role: Generates parabolic correction current synchronized to vertical sawtooth; drives diode modulator via external inductor to shape horizontal deflection waveform.

Use Value: Eliminates corner distortion with K1/K2 coefficients tuned to CRT geometry; Class-D efficiency reduces heatsink requirements in compact chassis.

Use Scenario: Professional CRT monitors needing adjustable keystone and width control for multi-aspect-ratio display modes.

IC Role / Device Role / Timing Role: Provides independent DC-adjustable keystone (Pin 1) and horizontal width (external sawtooth DC offset) for geometry fine-tuning.

Use Value: Enables user-accessible front-panel controls for trapezoid and horizontal size calibration without hardware modification.

Legacy Broadcast Equipment

Test & Calibration Systems

Use Scenario: Broadcast studio monitors and waveform analyzers where CRT linearity must meet SMPTE RP 167 standards.

IC Role / Device Role / Timing Role: Delivers repeatable parabolic output (V7A–V7E range ±40 mV) with <0.1% drift over temperature for metrology-grade deflection stability.

Use Value: Maintains geometric fidelity during extended operation; low 7 mA supply current minimizes thermal drift in sealed enclosures.

Use Scenario: CRT-based test fixtures verifying deflection yoke performance and diode modulator response.

IC Role / Device Role / Timing Role: Supplies calibrated parabolic current (via Pin 7 + external R) and dynamic field correction input (Pin 2) to simulate beam current variations.

Use Value: Allows controlled injection of field-dependent distortion to validate correction loop bandwidth and settling time.

Equivalent & Alternatives

The following parts are listed as comparable options for similar CRT east-west correction applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TDA8146	Same pinout and function but includes integrated high-voltage protection diodes; higher VSATL (2.5 V).	Required in systems with unclamped yoke flyback spikes exceeding 35 V.	Select when operating near absolute max supply or in non-isolated deflection stages.
LA7838	Dual-channel design; separate horizontal/vertical correction paths; no Class-D output stage (uses linear driver).	Supports simultaneous correction of both axes; higher quiescent current (12 mA) and thermal load.	Choose for applications requiring independent H/V geometry tuning without shared parabola network.

Compared with TDA8145, TDA8146 adds robustness against voltage transients but sacrifices some efficiency, while LA7838 offers axis independence at the cost of increased power dissipation and board space-making TDA8145 optimal for cost-sensitive, single-axis square-CRT correction.

Availability

TDA8145 is available at Aetrix Electronics and suitable for legacy CRT TV manufacturing, broadcast monitor refurbishment, and analog test equipment maintenance requiring stable component supply and long-term obsolescence support.

Supply support for TDA8145 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, designing and manufacturing analog, mixed-signal, and power ICs for industrial, automotive, and consumer applications.

The TDA8145 belongs to ST's legacy TV deflection IC product line, engineered specifically for analog CRT geometry correction with emphasis on low dissipation, precise parabola generation, and compatibility with discrete diode modulator networks.

FAQ

What is the purpose of the 100 µA current sink on Pin 3?

Pin 3 provides a precision 100 µA current sink referenced to the internal 8 V bandgap voltage. It is intended for biasing external current mirrors or setting gain in feedback networks. Its accuracy supports stable parabola coefficient calibration and enables predictable interaction with external resistors in the keystone and width adjustment circuits.

Can the TDA8145 drive modern flat-panel display timing controllers?

No. The TDA8145 is functionally and electrically designed exclusively for analog CRT deflection systems. Its parabola generation, sawtooth current inputs, and Class-D output stage match the impedance and timing requirements of magnetic yoke and diode modulator networks-not digital video interfaces, LVDS, or MIPI signals used in LCD/OLED panels.

How does parasitic parabola suppression work during vertical flyback?

During vertical flyback, the frame sawtooth current exceeds ±40 µA. The internal current limiter clamps the input to OP1 at 40 µA, preventing the parabola network from generating erroneous curvature. This eliminates visible retrace-line distortion while maintaining clean active-scan correction, confirmed by ∆V7 = ±40 mV specification under overmodulation.

Is the TDA8145 compatible with 24 V or 28 V CRT power supplies?

Yes. Electrical characteristics are specified at VS = 26 V, with operational range 17–30 V and absolute maximum 35 V. At 24 V, supply current remains within 4.5–7 mA; at 28 V, thermal dissipation stays within 500 mW limit at Tamb ≤ 50°C, provided PCB copper area and airflow meet POWERDIP8 thermal resistance requirements (Rth(j-a) ≤ 100 °C/W).

TDA8145 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Function:: Deflector Circuit

Applications:: Professional Video

Standards:: -

Control Interface:: Analog Voltage

Voltage - Supply:: 17V ~ 30V

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

Supplier Device Package:: 8-PowerDIP

TDA8145 FAQ

1.How can I place an order for TDA8145 through Aetrix?

Please submit a Request for Quotation (RFQ) for TDA8145 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 TDA8145 reliable?

The price and inventory of TDA8145 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TDA8145 is usually 5 days.

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4.How is shipping managed for TDA8145?

TDA8145 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TDA8145 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 TDA8145?

For technical support, including TDA8145 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TDA8145 requirements.

6.How does Aetrix verify that TDA8145 is sourced from the original manufacturer or authorized distributors?

All TDA8145 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 TDA8145 meets industry standards.

7.What is the process for return or replacement of TDA8145?

All TDA8145 units undergo pre-shipment inspection (PSI). If there is an issue with TDA8145, 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 TDA8145 part is unused and in its original packaging.

Return procedure for TDA8145:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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