Texas Instruments THS4303RGTR

Overview

THS4303RGTR from Texas Instruments is a wideband fixed-gain voltage-feedback operational amplifier with +10 V/V (20 dB) closed-loop gain, 1.8 GHz small-signal bandwidth, 5500 V/µs slew rate, 2.5 nV/√Hz input-referred noise, and ±180 mA output drive capability. It operates from single 3–5 V or dual ±1.5–±2.5 V supplies and targets high-speed signal conditioning in IF amplification, ADC preamplification, and wireless transceiver chains.

For engineers reviewing the THS4303RGTR datasheet, THS4303RGTR pinout, THS4303RGTR application, or THS4303RGTR equivalent, key selection criteria include its fixed +10 gain architecture, PowerPAD™ thermally enhanced RGT-16 package, power-down functionality (42 ns turn-on), and verified performance at 70–300 MHz for HD2/HD3 and IMD3 critical to RF receiver front-ends.

Technical Context

The THS4303RGTR implements a voltage-feedback topology with internal 450 Ω Rf and 50 Ω Rg resistors setting a precise +10 V/V noninverting gain. Its architecture delivers low distortion via optimized differential input stage and high-current output stage, enabling operation up to 1.5 GHz full-power bandwidth with 2 Vpp output swing into 100 Ω.

Power-down is controlled by a dedicated PD pin that reduces quiescent current from 34 mA to 1.4 mA, with defined 1.1–1.5 V turn-on and 0.9–1.1 V turn-off thresholds referenced to supply rails. The device requires external 50 Ω source/load matching and PCB-level thermal management via the exposed PowerPAD.

Key Specifications

Pinout & Package

The THS4303RGTR is housed in a 16-pin QFN-style RGT-16 package with exposed PowerPAD™ thermal pad on the underside, requiring solder connection to a PCB copper plane for thermal dissipation and electrical grounding.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar wideband fixed-gain amplifier applications.

Compared with LMH6401IRGET and ADA4870ARQZ, the THS4303RGTR uniquely combines factory-trimmed +10 gain, industry-leading 1.8 GHz bandwidth, and verified –76 dBc HD3 at 70 MHz in a thermally optimized 3 mm × 3 mm package-making it the optimal choice for compact, high-linearity IF and ADC driver designs.

Availability

THS4303RGTR is available at Aetrix Electronics and suitable for wireless infrastructure, high-speed data acquisition, and medical imaging systems requiring stable component supply, guaranteed long-term availability, and traceable sourcing from authorized channels.

Supply support for THS4303RGTR 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies with over 50 years of innovation in high-performance amplifiers and data converters.

The THS4303RGTR belongs to TI's high-speed operational amplifier product line, engineered specifically for RF and IF signal chain applications demanding wide bandwidth, low distortion, and robust thermal performance in compact form factors.

FAQ

What is the recommended power supply decoupling scheme for THS4303RGTR?

TI specifies three-tier decoupling per supply rail: 22 µF tantalum, 47 pF NP0 ceramic, and 0.1 µF X7R ceramic, placed as close as possible to pins 1–4 (VS−) and 12–15 (VS+). The PowerPAD must be soldered to a solid ground plane to achieve θJA = 39.5 °C/W and prevent thermal shutdown during sustained 1.01 W operation at 85°C ambient. Failure to implement this scheme risks increased distortion and instability above 100 MHz.

Does THS4303RGTR support true 3-state output during power-down mode?

No, THS4303RGTR does not provide high-impedance output in power-down mode. When PD is pulled low, quiescent current drops to ≤1.4 mA but the output remains active and capable of sourcing/sinking current. It is not designed as a bus driver or multiplexer; external analog switches are required for signal isolation in shared-bus architectures. The power-down function solely reduces static power consumption.

Can THS4303RGTR drive a 50 Ω load directly without external series resistance?

Yes, THS4303RGTR is characterized driving 50 Ω loads directly, as confirmed by S-parameter measurements (S22 < –20 dB up to 1 GHz) and large-signal frequency response plots with 50 Ω termination. However, for loads exceeding 2 pF capacitance-including PCB traces longer than 5 mm or unterminated cables-a series isolation resistor (10–25 Ω) must be added adjacent to the VOUT pin to maintain stability and flat frequency response per Figure 47 in the datasheet.

What is the maximum junction temperature limit for continuous operation of THS4303RGTR?

The absolute maximum junction temperature for continuous reliable operation is 125°C, as defined by long-term reliability constraints-not the 150°C absolute maximum rating. Exceeding 125°C causes measurable distortion increase and accelerated parametric drift. With θJC = 2.4 °C/W and θJA = 39.5 °C/W, maintaining TJ ≤ 125°C requires PCB thermal design ensuring ≤1.01 W power dissipation at TA = 85°C, verified using TI's SLMA002 PowerPAD guidelines.

How does the internal fixed resistor network affect gain accuracy across temperature for THS4303RGTR?

The THS4303RGTR integrates laser-trimmed 450 Ω Rf and 50 Ω Rg resistors, achieving ±0.2% gain accuracy at 25°C and maintaining ±0.25% over –40°C to +85°C. Electrical characteristics table shows voltage gain remains 9.8–10.0 V/V across temperature, with minimal drift due to matched TC of internal thin-film resistors. This eliminates external resistor tolerance and thermal tracking errors common in discrete gain networks.