Texas Instruments TL7726CDE4

Overview

TL7726CDE4 from Texas Instruments is a hex clamping circuit IC designed for transient voltage protection at analog inputs of CMOS devices, featuring six independent clamp channels, ±25 mA sink capability per channel, <1 µA standby input current, and operation across 0°C to 70°C. It safeguards ADCs and microprocessors in automotive and industrial signal conditioning paths against latch-up from large positive/negative transients.

For engineers reviewing the TL7726CDE4 datasheet, TL7726CDE4 pinout, TL7726CDE4 application, or TL7726CDE4 equivalent, key selection criteria include clamping voltage tolerance (±200 mV), reference voltage range (4.5–5.5 V), SOIC-8 thermal performance (θ_JA = 97°C/W), and compatibility with 5-V systems requiring low-power, no-overshoot transient suppression.

Technical Context

The TL7726CDE4 implements six identical voltage-clamp circuits that activate when input voltage falls below GND or exceeds the internal reference (REF), switching from high-impedance (<10 µA) to low-impedance active state capable of sinking ±25 mA. Each clamp operates independently without interaction between channels.

It delivers stable clamping across all capacitive loads with zero output overshoot and settling time ≤30 µs under ±13 V transient conditions with 600 Ω source impedance. The device draws less than 1 mW in standby and maintains functional integrity up to 150°C junction temperature.

Key Specifications

Pinout & Package

TL7726CDE4 is housed in an 8-pin SOIC (D) package with 1.27 mm lead pitch, 3.9 mm width, and 1.75 mm max height. Pin 1 is located at the top-left corner adjacent to the notch or dot marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7726CDR, TL7726CDE4 offers identical performance in a tube format ideal for lab evaluation and small-batch builds; versus SN74LVC1G125DBVR, it provides integrated, matched, six-channel analog clamping with guaranteed ±200-mV tolerance-eliminating external component count and calibration uncertainty in precision signal paths.

Availability

TL7726CDE4 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial ADC protection, microprocessor I/O safeguarding, and medical data acquisition systems requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for TL7726CDE4 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 connectivity technologies, with decades of heritage in high-reliability industrial and automotive components.

The TL7726CDE4 belongs to TI's legacy analog protection portfolio, engineered specifically for robust transient suppression in 5-V CMOS signal chains where latch-up immunity and minimal signal distortion are mandatory design requirements.

FAQ

What is the reference voltage requirement for TL7726CDE4?

The TL7726CDE4 requires an external reference voltage applied to its REF pin within 4.5 V to 5.5 V. This sets the upper clamping threshold (VIK⁺ = V_REF + 200 mV); the lower threshold remains fixed at –200 mV relative to GND. For standard 5-V systems, tie REF directly to V_CC. The TL7726CDE4 draws only 25–60 µA from the reference source, enabling use with low-current LDOs or filtered MCU V_DD.

Does TL7726CDE4 require external components to function?

No, the TL7726CDE4 operates autonomously with only power (GND) and reference (REF) connections. Each of its six CLAMP pins interfaces directly with a protected signal line-no series resistors, diodes, or capacitors are needed. Its internal architecture ensures stable clamping across all capacitive loads and eliminates output overshoot, making it a true plug-in protection solution for TL7726CDE4 signal paths.

How does TL7726CDE4 prevent latch-up in CMOS devices?

The TL7726CDE4 prevents latch-up by actively clamping input voltages to within ±200 mV of the supply rails before parasitic SCR structures in downstream CMOS ICs can trigger. When VI exceeds V_REF or drops below GND, the TL7726CDE4 sinks up to ±25 mA per channel-diverting transient current away from sensitive input protection diodes and holding node voltage within the safe linear region of the CMOS process.

What is the maximum transient voltage TL7726CDE4 can handle?

The TL7726CDE4 is characterized for transient suppression up to ±13 V with 600 Ω source impedance (t_s ≤ 30 µs), but its absolute maximum ratings allow ±50 mA clamp current and 6 V REF voltage. In practice, with appropriate series current-limiting (e.g., 10 kΩ per channel as shown in TI's Figure 3), the TL7726CDE4 protects against system-level transients exceeding 250 V-provided the external resistor absorbs the bulk energy while TL7726CDE4 maintains precise voltage clamping.

Is TL7726CDE4 pin-compatible with other variants like TL7726ID or TL7726QD?

Yes, TL7726CDE4 shares identical SOIC-8 pinout and electrical behavior with TL7726ID (–40°C to 85°C) and TL7726QD (–40°C to 125°C). The only differences are temperature grade and associated reliability testing-no changes to pin function, timing, or clamping thresholds. Engineers may substitute TL7726CDE4 with TL7726ID or TL7726QD in existing layouts when extended temperature operation is required, provided thermal design margins accommodate the higher θ_JA of alternate packages.