Texas Instruments TL7726IPG4

Overview

TL7726IPG4 from Texas Instruments is a hex clamping circuit IC designed for transient overvoltage protection of CMOS inputs in industrial and automotive systems. It features six independent clamp channels, ±25 mA clamping current capability, <1 µA standby input current, 0°C to 70°C operating range (per TL7726C), and SOIC-8 package - used to safeguard ADCs and microprocessors against latch-up during large positive/negative transients.

For engineers reviewing the TL7726IPG4 datasheet, TL7726IPG4 pinout, TL7726IPG4 application, or TL7726IPG4 equivalent, key selection criteria include clamping voltage tolerance (±200 mV), low-power standby dissipation (<1 mW), stable capacitive load handling, absence of output overshoot, and compatibility with 5-V reference-based protection schemes.

Technical Context

The TL7726IPG4 implements six identical voltage-referenced clamping circuits that activate only when input voltage falls below GND or exceeds REF by ≥200 mV. Each channel presents high impedance (<10 µA leakage) within the safe band (GND to REF–50 mV) and switches to low-impedance sink mode (≤25 mA) outside that band.

It operates with a fixed internal reference structure requiring external VREF connection at Pin 5, supports all capacitive loads without oscillation, and achieves 30 µs settling time under ±13 V transient conditions with 600 Ω source impedance - confirming robustness in noisy analog front-end environments.

Key Specifications

Pinout & Package

TL7726IPG4 uses an 8-pin SOIC (D) package with 1.27 mm pitch, 3.91 mm body width, and 1.75 mm max height per JEDEC MS-012AA. Pin 1 identifier located at top-left corner with notch marking.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL7726IDR and TL7726QD, TL7726IPG4 delivers identical clamping functionality and SOIC-8 compatibility but targets mid-range industrial and automotive applications with verified –40°C to +85°C operation and tube packaging - balancing reliability, cost, and ease of evaluation.

Availability

TL7726IPG4 is available at Aetrix Electronics and suitable for automotive sensor interfaces, industrial analog input modules, medical patient monitoring systems, and test & measurement equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL7726IPG4 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 TL7726IPG4 belongs to TI's legacy protection IC product line, engineered specifically for robust, low-power transient suppression in safety-critical analog signal paths - emphasizing latch-up immunity, predictable clamping thresholds, and zero-output-overshoot behavior.

FAQ

What is the reference voltage requirement for TL7726IPG4 operation?

The TL7726IPG4 requires an externally supplied reference voltage (VREF) at Pin 5, specified between 4.5 V and 5.5 V per datasheet. This reference sets the upper clamping threshold (VIK⁺ = VREF + 200 mV); deviation outside this range risks inaccurate clamping behavior. TL7726IPG4 does not generate its own reference and relies on a stable, low-noise 5 V source - commonly derived from the same rail powering the protected ADC or microcontroller.

Can TL7726IPG4 be used with 3.3 V systems?

Yes, TL7726IPG4 can protect 3.3 V logic interfaces, but VREF must still be set to 4.5–5.5 V as specified. The clamping action remains effective because VI < GND or VI > VREF triggers conduction - so a 3.3 V signal stays within the safe band (GND to VREF–50 mV) and draws <10 µA. TL7726IPG4 does not interface directly with 3.3 V logic levels; it safeguards them by shunting transients to the 5 V reference rail or ground.

Does TL7726IPG4 require external pull-up or pull-down resistors on CLAMP pins?

No, TL7726IPG4 does not require external biasing resistors on its CLAMP pins (1,2,3,6,7,8). Each channel is internally configured as a bidirectional clamp - sinking current to GND for negative excursions and to REF for positive excursions. Adding external resistors would alter the clamping threshold and degrade transient response; the device is designed for direct connection between signal line and protected IC input.

What is the maximum transient voltage TL7726IPG4 can safely clamp?

TL7726IPG4 is characterized for 30 µs settling time with ±13 V transients (RI = 600 Ω, tt < 1 µs), and absolute maximum ratings allow ±50 mA clamping current. While higher voltages may be tolerated briefly depending on source impedance, sustained clamping above ±13 V risks exceeding 25 mA per channel or violating the ±50 mA absolute max - potentially causing thermal stress. For >13 V threats, external series resistance must limit peak current to ≤25 mA, calculated as R ≥ (V_transient – V_clamp) / 25 mA.

Is TL7726IPG4 RoHS compliant and lead-free?

Yes, TL7726IPG4 is RoHS compliant and features NiPdAu (NIPDAU) lead finish per TI's packaging addendum. It meets JEDEC Level-1 moisture sensitivity classification with unlimited floor life at ≤30°C/60% RH, and is qualified for Pb-free reflow up to 260°C peak temperature - fully compatible with standard lead-free soldering processes used in modern electronics manufacturing.