Texas Instruments TL7726QDRG4

Overview

TL7726QDRG4 from Texas Instruments is a hex clamping circuit IC designed for transient overvoltage protection of CMOS inputs in automotive and industrial systems. It features six independent clamp channels, ±25 mA sink capability per channel, <10 µA standby current, 0°C to 125°C operating temperature range, and stable operation with any capacitive load - used to safeguard ADCs, microprocessors, and analog front-ends against latch-up.

For engineers reviewing the TL7726QDRG4 datasheet, TL7726QDRG4 pinout, TL7726QDRG4 application, or TL7726QDRG4 equivalent, key selection considerations include its –40°C to 125°C extended temperature rating, SOIC-8 package compatibility, low-power clamping behavior (≤1 mW standby), and precise ±200 mV clamp voltage tolerance relative to REF.

Technical Context

The TL7726QDRG4 implements six identical voltage-clamping circuits that activate when input voltage VI falls below GND or exceeds the reference voltage REF (4.5 V to 5.5 V). Each channel presents high impedance (<10 µA leakage) during normal operation and switches to low-impedance mode to sink up to ±25 mA during transients.

It operates without output overshoot and supports stable settling within 30 µs under 13 V transient conditions with 600 Ω source impedance. The device requires no external components beyond the REF bias network and is characterized for full functionality across –40°C to 125°C ambient temperature.

Key Specifications

Pinout & Package

TL7726QDRG4 is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, 3.91 mm body width, and 1.75 mm max height - compatible with standard surface-mount assembly processes and IPC-7351 land patterns.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7726IDR and TPD2E001DRYR, the TL7726QDRG4 uniquely delivers six synchronized, REF-referenced clamps with extended 125°C operation - enabling single-component protection for multi-signal automotive sensor hubs without thermal derating or layout compromise.

Availability

TL7726QDRG4 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial ADC protection, motor drive feedback conditioning, and microcontroller GPIO hardening requiring stable component supply across extended temperature ranges.

Supply support for TL7726QDRG4 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 power management technologies with over 50 years of automotive and industrial qualification experience.

The TL7726QDRG4 belongs to TI's legacy analog protection portfolio, engineered specifically for robust transient suppression in high-reliability signal conditioning paths - emphasizing latch-up immunity, low standby power, and wide-temperature operability.

FAQ

What is the maximum reference voltage that can be applied to the TL7726QDRG4 REF pin?

The TL7726QDRG4 REF pin supports a maximum reference voltage of 6 V, as specified in its absolute maximum ratings. However, for reliable clamping operation, TI recommends using 4.5 V to 5.5 V per the recommended operating conditions. Exceeding 5.5 V may cause VIK+ to exceed system-safe thresholds and reduce margin against latch-up in downstream CMOS devices. Always verify REF stability under load when sourcing from LDOs or resistive dividers.

Does the TL7726QDRG4 require external pull-up or pull-down resistors on its CLAMP pins?

No, the TL7726QDRG4 does not require external pull-up or pull-down resistors on its CLAMP pins. Each CLAMP terminal functions as a bidirectional clamp: it presents high impedance (leakage <10 µA) when VI is within GND to VREF–50 mV, and actively sinks current only when VI violates those bounds. Adding external bias resistors would interfere with its defined clamping thresholds and increase standby current - contrary to the device's low-power design intent.

Can the TL7726QDRG4 be used to protect RS-485 or CAN bus lines?

The TL7726QDRG4 is not intended for RS-485 or CAN bus line protection. Its clamping architecture assumes a single-ended, ground-referenced signal with a fixed 5 V REF - incompatible with differential bus voltages, common-mode ranges, or fail-safe biasing requirements of those protocols. For RS-485/CAN, TI recommends dedicated bus protectors like THVD1550 or TCAN1042, which provide symmetric differential clamping and bus-fault protection not offered by the TL7726QDRG4.

How does the TL7726QDRG4 differ from standard TVS diode arrays in terms of response time and accuracy?

The TL7726QDRG4 offers tighter clamping voltage accuracy (±200 mV around REF) and faster settling (30 µs) than typical multilayer TVS arrays, which often exhibit ±500 mV tolerance and slower recovery due to junction capacitance. Unlike passive TVS devices, the TL7726QDRG4 uses active clamping circuitry referenced to an external voltage - enabling precise, adjustable thresholds without sacrificing speed. This makes it preferable for protecting precision analog inputs where voltage excursion must stay within strict ADC input limits.

Is the TL7726QDRG4 RoHS compliant and lead-free?

Yes, the TL7726QDRG4 is RoHS compliant and features NiPdAu (NIPDAU) lead finish, as confirmed in TI's official packaging addendum. It meets JEDEC Level-1 moisture sensitivity standards and supports peak reflow temperatures up to 260°C. The "G4" suffix explicitly denotes green (halogen-free) and lead-free packaging - verified for use in modern SMT assembly lines without exemption waivers or special handling requirements.