Diodes Incorporated ZSM560GTC

Overview

ZSM560GTC from Zetex Semiconductors is a three-terminal under-voltage monitor IC designed for power-on reset and brown-out detection in 5 V microprocessor systems. It features a fixed 4.6 V threshold, 20 mV hysteresis, open-collector output capable of sinking ≥10 mA, and guaranteed operation from 1.0 V to 6.5 V supply. Used in embedded controllers where reliable reset assertion during power ramp-up or sag is critical.

For engineers reviewing the ZSM560GTC datasheet, ZSM560GTC pinout, ZSM560GTC application, or ZSM560GTC equivalent, key selection factors include its precise 4.6 V trip point, low quiescent current (200 µA max), TO-92/SOT223 package options, built-in clamp diode for RC delay networks, and hysteresis-enabled noise immunity in noisy supply rails.

Technical Context

The ZSM560GTC integrates a precision bandgap voltage reference and comparator with internal hysteresis to eliminate oscillation near the threshold. Its output remains low from power-up (1.0 V) until V_CC exceeds 4.61 V (typ), then asserts high-providing clean POR. If V_CC later falls below 4.59 V (typ), output pulls low again for brown-out reset.

Operation is specified across –40°C to +85°C with propagation delay ≤1.5 µs (R_L = 10 kΩ). The open-collector output supports flexible pull-up configurations and interfaces directly to TTL/CMOS logic or reset inputs requiring active-low assertion.

Key Specifications

Pinout & Package

Available in TO-92 (suffix C) and SOT-223 (suffix G) packages. ZSM560GTC uses TO-92 with standard pinout: Pin 1 = V_CC, Pin 2 = GND, Pin 3 = Output (open-collector).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar under-voltage monitor applications.

Compared with MAX809TRD3 and TLV803EB26DBZR, the ZSM560GTC uniquely combines TO-92 compatibility, integrated clamp diode for RC delay, and 4.6 V threshold optimized for legacy 5 V logic-making it irreplaceable in cost-sensitive, through-hole, or capacitor-timed reset designs.

Availability

ZSM560GTC is available at Aetrix Electronics and suitable for microprocessor power-on reset, battery-powered instrumentation, automotive body control modules, and computer peripheral power management requiring stable component supply across extended temperature ranges and long-lifecycle programs.

Supply support for ZSM560GTC 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

Zetex Semiconductors (now part of Diodes Incorporated) was a UK-based analog and power semiconductor specialist focused on high-reliability, application-optimized discrete and monitoring ICs.

The ZSM series was developed specifically for robust, low-cost supply monitoring in industrial and automotive microprocessor systems-emphasizing precision thresholds, hysteresis, and ease of integration without external components.

FAQ

What is the function of the internal clamp diode in the ZSM560GTC?

The internal clamp diode provides a controlled discharge path for an external timing capacitor used in RC-based reset delay circuits. When the supply voltage drops below threshold, the diode conducts to rapidly discharge the capacitor, ensuring consistent reset pulse width and eliminating reliance on slow natural leakage. This feature removes the need for an external diode in most POR implementations.

Can the ZSM560GTC operate reliably at –40°C?

Yes. The ZSM560GTC is fully specified from –40°C to +85°C. All key parameters-including threshold voltage (4.5–4.7 V), hysteresis (10–50 mV), and output sink current (10–60 mA)-are tested and guaranteed across this range. Its bandgap reference and comparator design ensure stable trip points without calibration across the full industrial temperature span.

Is the ZSM560GTC pin-compatible with the SOT-223 version (ZSM560G)?

No. ZSM560GTC uses TO-92 packaging (Pin 1 = V_CC, Pin 2 = GND, Pin 3 = Output), while ZSM560G uses SOT-223 (Pin 1 = Output, Pin 2 = GND, Pin 3 = V_CC, Pin 4 = thermal pad/floating). Pin assignments differ, and PCB layouts are not interchangeable. Electrical behavior is identical, but mechanical and routing design must match the specific package variant.

Does the ZSM560GTC require an external pull-up resistor on its output?

Yes. The ZSM560GTC has an open-collector output and must be pulled up to a logic-compatible voltage (e.g., 3.3 V or 5 V) using an external resistor. Typical values range from 4.7 kΩ to 10 kΩ. This configuration allows level-shifting, wired-OR logic, and compatibility with diverse reset input architectures found in microcontrollers and FPGAs.