Texas Instruments TL7733BCDG4

Overview

TL7733BCDG4 from Texas Instruments is a precision supply-voltage supervisor IC designed as a reset controller for microprocessor and microcontroller systems. It monitors the SENSE input for undervoltage conditions, provides true/complement RESET outputs, features an externally adjustable reset pulse duration via CT pin, and delivers a 3.08 V ±0.05 V threshold with 10 mV hysteresis over 0°C to 70°C. It operates across 3.6 V to 18 V supply range and supports stable reset assertion down to VCC ≥ 1 V.

For engineers reviewing the TL7733BCDG4 datasheet, TL7733BCDG4 pinout, TL7733BCDG4 application, or TL7733BCDG4 equivalent, this page delivers verified functional identity, confirmed SOIC-8 package mapping, validated 8-pin terminal roles, exact voltage threshold and hysteresis values, timing capacitor dependency (td ≈ 2.6×10⁴ × CT), and two rigorously cross-checked alternative parts for system-level reset design.

Technical Context

The TL7733BCDG4 implements a precision bandgap-based voltage reference and comparator architecture to detect SENSE input drops below 3.08 V (typ) with 10 mV hysteresis, ensuring noise-immune undervoltage detection. Its internal current source charges the external CT capacitor to generate a user-defined reset pulse width, with timing governed by td ≈ 2.6×10⁴ × CT (CT in farads).

It supports dual active outputs: open-collector RESET (active-high) and active-low RESET, both defined from VCC ≥ 1 V. The RESIN pin enables external reset override, forcing RESET high and RESET low when pulled low-providing manual or system-initiated reset control independent of SENSE monitoring.

Key Specifications

Pinout & Package

TL7733BCDG4 is housed in an SOIC-8 (D) package, 4.90 mm × 3.91 mm body size, with standard 1.27 mm lead pitch and gull-wing leads suitable for surface-mount reflow assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor applications.

Compared with TL7733BCDG4, TPS3808G33DBVR offers plug-and-play simplicity but sacrifices timing adjustability and RESIN override, while MAX6326LT33D3+T extends temperature range at the cost of dual-output capability and reference stability-making TL7733BCDG4 optimal for designs needing field-tunable reset hold time and hardware/software reset coordination.

Availability

TL7733BCDG4 is available at Aetrix Electronics and suitable for industrial automation, network infrastructure, and medical electronics requiring stable component supply, long-term manufacturability, and guaranteed traceable sourcing.

Supply support for TL7733BCDG4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in power management, signal chain, and control technologies.

The TL77xxB family was engineered specifically for robust, precision reset control in microprocessor-based systems-emphasizing voltage accuracy, hysteresis stability, and flexible timing to prevent erratic startup and runtime failures.

FAQ

What is the exact undervoltage threshold voltage for TL7733BCDG4?

The TL7733BCDG4 has a nominal negative-going input threshold voltage (V_IT–) of 3.08 V at 25°C, with a guaranteed range of 3.03 V to 3.13 V across temperature and process variation. This value is specified for the TL7733B variant and applies directly to TL7733BCDG4, which uses the BC suffix indicating 0°C to 70°C operation and SOIC-8 packaging.

Does TL7733BCDG4 provide both active-high and active-low reset outputs?

Yes, TL7733BCDG4 provides true and complement reset outputs: pin 6 (RESET) is active-high open-collector, and pin 5 (RESET) is active-low open-collector. Both require external pull-up or pull-down resistors per application requirements, and their simultaneous assertion ensures compatibility with diverse microcontroller reset input architectures.

How is the reset pulse duration set on TL7733BCDG4?

The reset pulse duration on TL7733BCDG4 is set externally via capacitor CT connected to pin 3. The relationship is td ≈ 2.6 × 10⁴ × CT, where CT is in farads and td is in seconds-for example, a 0.1 µF capacitor yields approximately 2.6 ms. This timing begins after the SENSE voltage exceeds V_IT+ and ensures sufficient reset hold time for system stabilization.

What is the function of the REF pin on TL7733BCDG4?

The REF pin (pin 1) on TL7733BCDG4 outputs a precision 2.53 V (typ) reference voltage, derived from an internal temperature-compensated bandgap. A 0.1 µF capacitor must be placed between REF and GND to suppress noise and prevent false triggering-this decoupling is mandatory per TI's layout guidelines and directly impacts reset reliability.

Can TL7733BCDG4 operate with supply voltages below 3.3 V?

No-TL7733BCDG4 requires a minimum supply voltage of 3.6 V per its Recommended Operating Conditions. Although RESET outputs are defined from VCC ≥ 1 V, the device does not function correctly below 3.6 V. For sub-3.3-V supervision, alternate supervisors such as TLV803 or TPS3801 series should be evaluated instead of TL7733BCDG4.