Texas Instruments TL7726CDR

Overview

TL7726CDR from Texas Instruments is a hex clamping circuit IC designed to protect CMOS inputs against latch-up and transient overvoltage in automotive and industrial analog-to-digital converter interfaces. It features six independent clamping channels, 25-mA sink capability per channel, <1-mW standby dissipation, and operates across 0°C to 70°C with a 4.5–5.5-V reference voltage range.

For engineers reviewing the TL7726CDR datasheet, TL7726CDR pinout, TL7726CDR application, or TL7726CDR equivalent, this device serves as a precision rail-to-rail input protection solution for systems exposed to ±13-V transients, requiring stable clamping thresholds, no output overshoot, and compatibility with capacitive loads up to unspecified values.

Technical Context

The TL7726CDR implements six identical voltage-clamp circuits that activate when input voltage (VI) falls below GND or exceeds the internal reference (REF), sinking up to ±25 mA. Each clamp presents <10 µA leakage when VI is within GND to REF–50 mV, ensuring minimal loading on protected signal paths.

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 under 13-V step input with 600-Ω source impedance, and operation remains stable across full capacitive load ranges without oscillation or overshoot.

Key Specifications

Pinout & Package

TL7726CDR is housed in an 8-pin SOIC (D) package with 1.75-mm maximum height, tape-and-reel packaging (2500 units/reel), and RoHS-compliant NiPdAu lead finish. Pin 1 orientation follows quadrant Q1 per JEDEC standard tape configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7726CDR, TL7726IDR adds industrial-grade thermal margin without layout changes, while TL7726QDR delivers automotive qualification and higher junction temperature tolerance - both retain identical clamping thresholds, sink current, and pin compatibility.

Availability

TL7726CDR is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial PLC analog inputs, motor drive feedback protection, and medical instrument signal conditioning requiring stable component supply and long-term manufacturability.

Supply support for TL7726CDR 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 90 years of innovation in industrial, automotive, and communications markets.

The TL7726 family was developed specifically for high-reliability input protection in 5-V CMOS systems vulnerable to latch-up, targeting automotive and industrial data acquisition where transient immunity and zero-output-overshoot are critical design requirements.

FAQ

What is the reference voltage requirement for TL7726CDR?

The TL7726CDR requires an externally supplied reference voltage (VREF) between 4.5 V and 5.5 V applied to Pin 8. This reference sets both the upper clamping threshold (VREF + 200 mV) and lower threshold (–200 mV). The device draws only 25–60 µA from the reference source, making it compatible with low-power voltage references or regulated 5-V rails.

Does TL7726CDR require external components to function?

No, TL7726CDR operates autonomously with only VREF applied to Pin 8 and GND on Pin 1. Its six CLAMP outputs (Pins 2–7) connect directly to protected signal lines. No external resistors, capacitors, or bias networks are needed - the device's internal architecture ensures stable clamping across all capacitive loads without compensation.

How does TL7726CDR prevent latch-up in CMOS devices?

TL7726CDR prevents latch-up by limiting input voltage excursions to –200 mV to VREF + 200 mV before the protected device's input ESD diodes conduct significantly. By sinking up to ±25 mA during overvoltage events, it diverts transient energy away from the CMOS input structure, keeping junction voltages below the parasitic SCR trigger threshold and eliminating the root cause of latch-up.

What is the settling time specification for TL7726CDR?

The TL7726CDR has a specified settling time of 30 µs, measured from 10% to 90% of final clamped voltage under test conditions of ±13-V input step, 600-Ω source impedance, and <1-µs rise time. This value reflects the device's ability to rapidly stabilize after large transients, ensuring protected circuits recover before the next sampling or control cycle.

Is TL7726CDR pin-compatible with other variants in the TL7726 family?

Yes, TL7726CDR shares identical SOIC-8 pinout and electrical behavior with TL7726IDR and TL7726QDR. All three use Pins 1 (GND), 2–7 (CLAMP), and 8 (REF) with identical spacing, thermal pad absence, and mechanical footprint - enabling drop-in replacement across commercial, industrial, and automotive temperature grades without PCB redesign.