Texas Instruments TL7726QDR

Overview

TL7726QDR from Texas Instruments is a hex clamping circuit IC designed to protect CMOS analog-to-digital converters and microprocessors against large positive/negative transients in automotive and industrial environments. It features six independent clamping channels, ±25 mA sink capability per channel, <10 µA standby input current, 4.5–5.5 V reference voltage range, and operates across –40°C to 125°C.

For engineers reviewing the TL7726QDR datasheet, TL7726QDR pinout, TL7726QDR application, or TL7726QDR equivalent, this device is selected for transient overvoltage protection where latch-up prevention, low standby power (<1 mW), stable capacitive load handling, and no output overshoot are critical design requirements.

Technical Context

The TL7726QDR implements six identical voltage-clamping circuits that activate when input voltage (VI) falls below GND or exceeds the internal reference (REF). Each channel presents high impedance (<10 µA leakage) during normal operation (GND ≤ VI < REF) and switches to low-impedance active state with ±25 mA sink capacity under fault conditions.

Clamping thresholds are defined as VIK+ = REF + 200 mV (positive clamp) and VIK– = –200 mV (negative clamp), both tested at 20 mA. Settling time is 30 µs with 600 Ω source impedance and sub-1 µs transient rise time, ensuring fast response to ESD and surge events without oscillation or overshoot.

Key Specifications

Pinout & Package

TL7726QDR is housed in an 8-pin SOIC (D) package with 1.27 mm lead pitch, 3.91 mm body width, and 4.90 mm body length. The package is RoHS-compliant, tape-and-reel packaged (2500 units/reel), and rated MSL Level-1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage clamping applications.

Compared with TL7726CDR and TL7726IDR, the TL7726QDR provides guaranteed operation up to 125°C junction temperature - essential for under-hood automotive placements and high-power industrial enclosures where thermal derating of alternatives would compromise clamping performance or lifetime reliability.

Availability

TL7726QDR is available at Aetrix Electronics and suitable for automotive engine control units, industrial programmable logic controllers, and medical patient monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL7726QDR 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and digital signal processing technologies since 1930.

The TL7726QDR belongs to TI's legacy analog protection product line, engineered specifically for robust transient voltage suppression in safety-critical analog signal chains where latch-up immunity and predictable clamping behavior are mandatory.

FAQ

What is the maximum clamping current per channel for TL7726QDR?

The TL7726QDR supports ±25 mA clamping current per channel under fault conditions - verified at VI ≥ VREF (25 mA sink) and VI ≤ GND (–25 mA sink). This rating is specified across the full –40°C to 125°C operating range and ensures reliable protection against common-mode transients without thermal runaway.

Does TL7726QDR require an external reference voltage source?

No - the TL7726QDR uses an internal reference generator tied to the REF pin, which must be externally biased between 4.5 V and 5.5 V. The device draws only 25–60 µA reference current (IZ) at VREF = 5 V, enabling direct connection to a stable 5 V rail or precision reference without loading concerns.

Can TL7726QDR replace discrete TVS diodes in ADC protection circuits?

Yes - the TL7726QDR provides controlled clamping with precise thresholds (VIK+ = REF + 200 mV, VIK– = –200 mV), no overshoot, and stable behavior into capacitive loads, making it a superior alternative to generic TVS diodes in precision analog signal paths where leakage, capacitance, and clamping accuracy matter.

What is the settling time specification for TL7726QDR and how is it measured?

The TL7726QDR has a 30 µs settling time, measured from 10% to 90% of final clamped voltage under test conditions: VI(system) = ±13 V, RI = 600 Ω, and transient rise time tt < 1 µs. This value reflects total response latency including internal switching and output stabilization - critical for protecting fast-sampling ADCs.

Is TL7726QDR pin-compatible with other variants in the TL7726 family?

Yes - all TL7726 variants (C/I/Q suffixes) share identical 8-pin SOIC (D) package pinout and electrical interface. The TL7726QDR can directly replace TL7726CDR or TL7726IDR on existing PCBs without layout changes, provided thermal and reliability requirements align with the –40°C to 125°C qualification.