Texas Instruments TL7726QD

Overview

TL7726QD from Texas Instruments is a hex clamping circuit IC designed for transient overvoltage protection of CMOS inputs in harsh environments. It features six independent clamping channels, ±25 mA sink capability per channel, <1 mW standby power dissipation, –40°C to 125°C operating temperature range, and stable operation with any capacitive load - used to safeguard analog-to-digital converters and microprocessors in automotive and industrial systems.

For engineers reviewing the TL7726QD datasheet, TL7726QD pinout, TL7726QD application, or TL7726QD equivalent, this device delivers precise rail-to-rail clamping with no output overshoot, latch-up immunity, and validated performance across extended temperature extremes - critical when selecting protection devices for high-reliability signal conditioning paths.

Technical Context

The TL7726QD implements six identical voltage-clamp circuits referenced to an internal REF pin, each activating only when input voltage falls below GND or exceeds REF by ≥200 mV. Each clamp presents <10 µA leakage in standby (GND ≤ VI ≤ REF – 50 mV) and transitions to low-impedance state capable of sinking up to 25 mA during overvoltage events.

Clamping thresholds are defined as VIK+ = VREF + 200 mV (positive clamp) and VIK– = –200 mV (negative clamp), both tested at 20 mA clamp current. Settling time is 30 µs under 13 V transient excitation with 600 Ω source impedance, and the device remains stable with unlimited capacitive loading without oscillation or overshoot.

Key Specifications

Pinout & Package

TL7726QD is housed in an 8-pin SOIC (D) package with 1.75 mm maximum height, JEDEC MS-012 variation AA compliant, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7726ID and TL7726CD, the TL7726QD uniquely supports sustained operation up to +125°C while retaining identical electrical behavior, pin compatibility, and layout footprint - making it the sole option for AEC-Q100-aligned designs requiring full engine bay or high-ambient thermal resilience.

Availability

TL7726QD 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 TL7726QD 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, delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TL7726QD belongs to TI's legacy analog protection portfolio, engineered specifically for robust, low-power, rail-to-rail clamping in safety-critical signal acquisition paths - emphasizing latch-up immunity and thermal resilience over feature-rich programmability.

FAQ

What is the maximum allowable reference voltage for TL7726QD?

The TL7726QD specifies a recommended operating range of 4.5 V to 5.5 V for the REF pin. Absolute maximum rating is 6 V. Exceeding 5.5 V may shift the positive clamp threshold beyond design intent and reduce margin against latch-up; operation above 6 V risks permanent damage. Always decouple REF with a 0.1 µF ceramic capacitor to GND near the TL7726QD package.

Does TL7726QD require external biasing or pull-up resistors?

No, the TL7726QD operates autonomously with only REF and GND connections. Its clamps activate passively based on input voltage relative to REF - no enable signals, control pins, or external biasing components are needed. The REF pin draws only 25–60 µA, so standard 5 V LDOs or microcontroller VCC rails can drive it directly without additional buffering.

Can TL7726QD be used to protect bidirectional data lines like I²C?

The TL7726QD is not suitable for bidirectional bus protection such as I²C because its clamps sink current only - they do not source. Applying it to open-drain lines would disrupt pull-up functionality and cause logic level violations. It is intended exclusively for unidirectional analog or digital input protection where the signal source drives into the clamp, not for shared-bus signaling.

What is the thermal resistance (θJA) of TL7726QD in SOIC-8 package?

The TL7726QD in SOIC-8 (D) package has a specified junction-to-ambient thermal resistance (θJA) of 97°C/W under standard JEDEC test conditions. This value assumes a 1-inch² copper pad with two vias; actual board-level θJA will vary based on PCB copper area, layer count, and airflow. For 125°C operation, ensure power dissipation stays below ~260 mW to maintain safe junction temperature.

Is TL7726QD pin-compatible with other variants like TL7726CD or TL7726ID?

Yes, TL7726QD shares identical SOIC-8 pinout, terminal functions, and electrical behavior with TL7726CD and TL7726ID - differing only in temperature qualification. All three use pins 1 (GND), 2–7 (CLAMP), and 8 (REF) identically. No PCB redesign is required when upgrading from CD or ID to QD for extended temperature deployment.