Diodes Incorporated ZRT100GC1TC

Overview

ZRT100GC1TC from Zetex Semiconductors is a precision 9.8 V monolithic voltage reference IC with 1% initial tolerance, 15 ppm/°C temperature coefficient, and trimmable output via external resistor. It operates from 150 µA to 30 mA, delivers low 50 µV_P-P noise (0.1–10 Hz), and requires no external capacitor in most applications. Used in high-accuracy ADC/DAC biasing, sensor signal conditioning, and programmable power supply setpoints.

For engineers reviewing the ZRT100GC1TC datasheet, ZRT100GC1TC pinout, ZRT100GC1TC application, or ZRT100GC1TC equivalent, key selection criteria include its SOT223 package, ±5% trim range, 1.8 Ω slope resistance, -40°C to +85°C C-grade operation, and absence of mandatory stabilization capacitance.

Technical Context

The ZRT100GC1TC implements a bandgap-derived reference core with on-chip trimming capability, enabling post-assembly calibration of output voltage across a ±5% range using a single external resistor. Its low 15 ppm/°C TCVR and 27 mV total ∆V_R over -40°C to +85°C ensure stability in industrial instrumentation and data acquisition systems.

Designed for low-power operation, it maintains regulation down to 150 µA knee current and supports up to 30 mA load while sustaining <4 Ω slope resistance. The SOT223 package integrates thermal mass for improved power dissipation handling (2 W at 25°C ambient) without heatsinking in typical PCB layouts.

Key Specifications

Pinout & Package

SOT223 package (4-pin, pin 4 internally floating or tied to pin 2 per datasheet top view). Thermal pad on underside enhances PCB heat transfer. Standard JEDEC MO-178 footprint with 6.3–6.7 mm body length and 3.3–3.7 mm E1 width.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF02CP and LM4040CIM3-10, the ZRT100GC1TC offers unique trimmability in SOT223, lower noise, and lower knee current-making it optimal for calibrated, low-power, surface-mount precision systems requiring post-assembly voltage tuning.

Availability

ZRT100GC1TC is available at Aetrix Electronics and suitable for industrial sensor transmitters, portable data loggers, and programmable power supplies requiring stable component supply, long-term calibration retention, and SMT manufacturability.

Supply support for ZRT100GC1TC 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) specialized in high-performance analog and discrete semiconductors, emphasizing precision, low-noise, and thermal robustness for industrial and instrumentation markets.

The ZRT100 series was developed specifically for applications demanding stable, trimmable voltage references in compact surface-mount packages-targeting data acquisition, sensor signal chains, and programmable power control where calibration flexibility and thermal stability are critical.

FAQ

What is the maximum input voltage the ZRT100GC1TC can tolerate?

The absolute maximum input voltage is not explicitly specified, but the device's power dissipation limit of 2 W at 25°C and 30 mA maximum operating current imply a safe upper bound of ~67 V (2 W ÷ 30 mA). In practice, input should remain ≤15 V to avoid excessive self-heating and maintain specified TCVR performance.

Can the TRIM pin be left unconnected without affecting stability?

Yes - the TRIM pin must be left open-circuit when not in use. Internal circuitry isolates this node, and leaving it floating introduces no leakage path or instability. No pull-up, pull-down, or capacitor is required, preserving reference accuracy and noise performance.

How does the ZRT100GC1TC behave below its 150 µA knee current?

Below 150 µA, output voltage drops nonlinearly and regulation is lost. At 100 µA, typical output falls to ~9.2 V; at 50 µA, it drops further to ~8.1 V. For reliable operation, design must ensure minimum cathode current ≥150 µA under all conditions, including lowest-temperature, highest-resistance scenarios.

Is the thermal pad (Pin 4) electrically isolated from other pins?

No - Pin 4 is internally connected to Pin 2 (cathode/output). It must be soldered to the same net as Pin 2, typically a large copper pour tied to the reference ground plane. This connection provides both thermal conduction and low-inductance return path, reducing noise coupling into the reference output.