Texas Instruments TL026ID

Overview

TL026ID from Texas Instruments is a monolithic two-stage differential high-frequency amplifier with AGC, designed for RF/IF signal conditioning in analog receiver front-ends. It delivers 38 dB typical peak gain, 50 MHz –3 dB bandwidth, and 50 dB typical AGC range while maintaining low harmonic distortion and stable gain across temperature. Used in TV/radio IF stages and magnetic storage read channels where wideband variable gain with precise common-mode control is required.

For engineers reviewing the TL026ID datasheet, TL026ID pinout, TL026ID application, or TL026ID equivalent, key selection criteria include its differential input/output architecture, AGC voltage-controlled gain attenuation (±180 mV around Vref), emitter-follower output drive capability, and operation over –40°C to 85°C industrial temperature range.

Technical Context

The TL026ID employs current-source biasing across all stages to achieve high common-mode and supply-voltage rejection ratios (CMRR ≥ 50 dB at 100 kHz; kSVR ≥ 50 dB). Its internal feedback network enables wide bandwidth (50 MHz) with low phase distortion and excellent gain stability under AGC modulation.

Gain control is implemented via differential summation at the AGC terminal, where applied voltage (VAGC – Vref) linearly attenuates large-signal differential voltage amplification (AVD) from ~105 V/V down by 50 dB. Emitter-follower outputs provide low output impedance (20 Ω) and support capacitive load driving without external compensation.

Key Specifications

Pinout & Package

TL026ID is packaged in an 8-pin SOIC (D) package with 1.27 mm lead pitch, 3.9 mm body width, and 1.75 mm max height - compliant with JEDEC MS-012AA and IPC-7351 footprint standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential high-frequency amplifier with AGC applications.

Compared with TL026CD and NE592, TL026ID offers extended temperature operation (–40°C to +85°C), integrated REF OUT for simplified AGC loop design, and superior bandwidth (50 MHz vs. 35 MHz), making it optimal for industrial RF front-ends requiring robustness and minimal external components.

Availability

TL026ID is available at Aetrix Electronics and suitable for TV IF amplifiers, FM radio receivers, magnetic tape playback systems, and disk read channel designs requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for TL026ID 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 company founded in 1930, specializing in analog ICs, embedded processors, and high-reliability power management solutions.

The TL026ID belongs to TI's legacy high-frequency amplifier product line, engineered for analog signal conditioning in broadcast, communications, and data storage systems requiring wideband differential gain with electronic control.

FAQ

What is the operating temperature range of the TL026ID?

The TL026ID is specified for operation from –40°C to +85°C, qualifying it for industrial environments where ambient temperatures exceed the 0°C to 70°C range of the TL026C variant. This extended range ensures reliable performance in factory automation equipment, outdoor broadcast receivers, and automotive infotainment IF stages without derating. The TL026ID maintains its 50 MHz bandwidth and 50 dB AGC range across this full span, as verified in TI's characterization reports.

How does the REF OUT pin function in the TL026ID AGC circuit?

The REF OUT pin on the TL026ID provides a stable 1.3–1.5 V DC reference voltage used to bias the AGC input. In practice, VAGC must be set to Vref ± 180 mV to achieve full 50 dB gain control range. This internal reference eliminates need for external precision voltage sources and ensures thermal tracking between Vref and AGC path - a critical feature for stable AGC loop operation across temperature. The TL026ID's REF OUT is not buffered and should drive only high-impedance nodes like op-amp inputs.

Can the TL026ID drive a 50 Ω transmission line directly?

Yes, the TL026ID can drive a 50 Ω load directly via its emitter-follower outputs, though with reduced peak-to-peak swing. With RL = 50 Ω, output swing drops to ~1.5 Vpp (vs. 3–4 Vpp into 2 kΩ), remaining within safe limits given its ±10 mA output current rating. For optimal signal integrity, TI recommends using 50 Ω series termination at the output and AC-coupling to prevent DC loading. The low 20 Ω output impedance ensures minimal mismatch loss and preserves rise time (<12 ns) in RF applications.

What is the minimum supply voltage required for proper operation of the TL026ID?

The TL026ID requires minimum supply voltages of ±3 V (i.e., VCC+ = +3 V, VCC– = –3 V) to ensure full functionality across its specified operating range. At ±3 V, the device maintains usable gain (≥55 V/V), 50 MHz bandwidth, and AGC linearity - though output swing compresses to ~2.8 Vpp into 2 kΩ. Operation below ±3 V risks input stage saturation and degraded CMRR; TI does not characterize or guarantee performance outside the ±3 V to ±8 V recommended range.

Is the TL026ID pin-compatible with the NE592 or uA733?

No, the TL026ID is not pin-compatible with the NE592 or uA733. While functional similarities exist (differential high-frequency amplifiers with AGC), the TL026ID uses an 8-pin SOIC layout with dedicated REF OUT (Pin 2) and differential outputs (Pins 7–8), whereas NE592/uA733 use 8-pin DIP packages with different pin assignments - including no REF OUT and single-ended outputs. Board redesign is required for substitution; however, system-level AGC loop behavior and bandwidth response are broadly comparable when reconfigured.