Texas Instruments TL7726QP

Overview

TL7726QP 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 µA standby current, 0°C to 70°C reference voltage range (4.5–5.5 V), and operates across –40°C to 125°C ambient temperature.

For engineers reviewing the TL7726QP datasheet, TL7726QP pinout, TL7726QP application, or TL7726QP equivalent, this device serves as a precision rail-to-rail input clamp for high-reliability signal conditioning paths where transient immunity, low power standby, and stable capacitive load drive are critical selection criteria.

Technical Context

The TL7726QP implements six identical voltage-reference-based clamping circuits that activate when input voltage falls below GND or exceeds REF, sinking up to ±25 mA with clamping thresholds of VREF +200 mV (positive) and –200 mV (negative). Each channel draws <10 µA when VI is within GND to VREF –50 mV.

It delivers stable operation with no output overshoot and supports all capacitive loads without oscillation. Its settling time is ≤30 µs under 13 V transient step with 600 Ω source impedance, making it suitable for fast-responding protection in ADC front-ends and microprocessor I/O buffers.

Key Specifications

Pinout & Package

TL7726QP is housed in an 8-pin plastic DIP (P) package with 0.300-inch body width and through-hole mounting. Pin 1 is located at the left end of the top row (viewed from top), with standard DIP lead spacing (0.100 inch).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7726ID and SN74LVC1G125DBVR, TL7726QP uniquely combines six-channel rail-clamping, internal reference tracking, and full AEC-Q100–compatible temperature range in a single DIP package - delivering verified transient immunity without external components or layout compromises.

Availability

TL7726QP 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 with guaranteed long-term availability and full traceability.

Supply support for TL7726QP 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 power management technologies with over 50 years of industrial and automotive product leadership.

The TL7726QP belongs to TI's legacy analog protection portfolio, engineered specifically for robust input conditioning in safety-critical signal chains where latch-up prevention and transient resilience are non-negotiable design requirements.

FAQ

What is the primary function of the TL7726QP in a circuit?

The TL7726QP functions as a six-channel voltage-clamping protection device that limits input signals to safe levels relative to a reference voltage (REF). It sinks up to ±25 mA per channel when input voltage exceeds VREF +200 mV or falls below –200 mV, preventing latch-up and damage to downstream CMOS components. The TL7726QP achieves this with minimal leakage (<10 µA) and zero output overshoot during clamping events.

Does the TL7726QP require external components to operate correctly?

No, the TL7726QP operates autonomously with only two external connections required: a stable reference voltage applied to pin 8 (REF) and a solid ground connection to pin 1 (GND). All six clamp outputs (pins 2–7) connect directly to protected nodes. No external resistors, capacitors, or bias networks are needed - the TL7726QP integrates internal reference tracking and clamping thresholds.

Can the TL7726QP be used with a 3.3 V system reference?

The TL7726QP is specified for REF voltages between 4.5 V and 5.5 V per datasheet Section "Recommended Operating Conditions". Using 3.3 V on the REF pin violates the minimum specification and results in undefined clamping thresholds and reduced current-sinking capability. For 3.3 V systems, TI recommends evaluating the TL7705 or discrete clamp solutions - the TL7726QP must be used with a 5 V reference to ensure guaranteed performance.

How does the TL7726QP differ from standard TVS diodes in transient protection?

Unlike passive TVS diodes, the TL7726QP provides active, reference-controlled clamping with precise voltage thresholds (VREF ±200 mV), low leakage (<10 µA), and no capacitance-induced signal distortion. TVS devices exhibit higher dynamic impedance and less predictable turn-on behavior. The TL7726QP also offers six independent channels in one package, whereas discrete TVS arrays lack integrated reference alignment - making the TL7726QP superior for precision analog input protection.

Is the TL7726QP pin-compatible with other variants like TL7726CD or TL7726ID?

Yes, all TL7726 variants - including TL7726QP, TL7726CD, and TL7726ID - share identical 8-pin DIP (P) or SOIC (D) footprints and pin assignments. The only differences are temperature rating (TL7726QP: –40°C to +125°C), packaging (P = PDIP), and screening level. A TL7726QP can directly replace TL7726CP or TL7726IP on the same PCB without layout changes, provided mechanical and thermal constraints allow the P-package form factor.