STMicroelectronics TL7702ACD1013TRA

Overview

TL7702ACD1013TRA from STMicroelectronics is a precision supply voltage supervisor IC designed for power-on reset generation and brown-out detection in microcontroller systems. It features a 2.5 V ±2% threshold voltage, true/complement RESET outputs (active-high and active-low), externally adjustable reset pulse width via CT pin (0.65–2.6 ms with 0.1 µF), and operates across 3.6–18 V supply range with 1.8–3.3 mA quiescent current.

For engineers reviewing the TL7702ACD1013TRA datasheet, TL7702ACD1013TRA pinout, TL7702ACD1013TRA application, or TL7702ACD1013TRA equivalent, key selection considerations include its fixed 2.5 V sensing threshold, SO-8 package compatibility, temperature range (0°C to 70°C), and dual-output reset architecture for reliable microprocessor initialization and fault recovery.

Technical Context

The TL7702ACD1013TRA implements a precision bandgap-based voltage reference (2.48–2.58 V at 25°C) with temperature compensation, enabling stable threshold detection across its operating range. Its SENSE input monitors supply voltage relative to this reference, triggering reset outputs when VS drops below VT (2.45–2.58 V) or during power-up until VS exceeds VT + hysteresis (10–15 mV).

Reset timing is controlled by an external capacitor on the CT pin, yielding programmable pulse width t_po = 1.3×10⁴ × C_T (e.g., 1.3 ms with 0.1 µF). The REF pin provides a buffered 2.5 V reference requiring a 0.1 µF bypass capacitor to suppress transients, while RESIN allows manual reset assertion independent of supply monitoring.

Key Specifications

Pinout & Package

TL7702ACD1013TRA is housed in an SO-8 (Small Outline, 8-pin) surface-mount package per JEDEC MS-012, with standard 1.27 mm pitch, 4.8–5.0 mm body width, and 5.8–6.2 mm body length.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3808G01DBVR and MAX6816EUT+T, TL7702ACD1013TRA uniquely delivers dual complementary outputs, a usable 2.5 V reference, and wide-supply flexibility-making it optimal for legacy microcontroller systems requiring robust, self-contained reset supervision without added passive components.

Availability

TL7702ACD1013TRA is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical infusion pump controllers requiring stable component supply and long-term lifecycle support.

Supply support for TL7702ACD1013TRA 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering silicon solutions for smart driving, power management, and microcontroller ecosystems.

The TL7700A series belongs to ST's legacy analog power-supervision product line, engineered specifically for deterministic reset generation in 8-bit and 16-bit microcomputer systems where predictable power-up sequencing and brown-out recovery are critical.

FAQ

What is the function of the REF pin on TL7702ACD1013TRA?

The REF pin provides a buffered, temperature-compensated 2.48–2.58 V reference output derived from the internal bandgap. It is intended for use as a stable voltage source for external circuits such as ADC references or bias networks. A 0.1 µF capacitor must be placed between REF and GND to ensure stability and reduce sensitivity to supply transients.

Can TL7702ACD1013TRA monitor a 3.3 V supply directly?

Yes-its 2.5 V sense threshold is ideal for supervising 3.3 V systems. The SENSE pin connects directly to the 3.3 V rail, and the device asserts reset when voltage falls below 2.45–2.58 V. Per datasheet Note 3, the SENSE voltage must not exceed VS − 1 V or 6 V, whichever is lower, ensuring safe operation at 3.3 V.

How is the reset pulse width adjusted on TL7702ACD1013TRA?

Reset pulse width is set by an external capacitor connected between the CT pin (Pin 3) and GND. The relationship is t_po = 1.3 × 10⁴ × C_T, where C_T is in farads and t_po in seconds. For example, a 0.1 µF capacitor yields ~1.3 ms pulse width. This allows precise tailoring to match the target microcontroller's minimum reset hold time requirement.

Is TL7702ACD1013TRA pin-compatible with other TL7700A variants?

No-TL7702ACD1013TRA has a fixed 2.5 V threshold and uses internal resistor configuration R1 = 0 Ω, R2 = open. Other variants (e.g., TL7705A, TL7709A) have different internal dividers and distinct threshold voltages. While all share the same SO-8 pinout, they are not functionally interchangeable without circuit redesign.