Diodes Incorporated ZRT100GC1TA

Overview

ZRT100GC1TA 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 industrial power supply feedback loops.

For engineers reviewing the ZRT100GC1TA datasheet, ZRT100GC1TA pinout, ZRT100GC1TA application, or ZRT100GC1TA 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 ZRT100GC1TA implements a bandgap-derived reference core with integrated trim node enabling precise post-manufacture adjustment of output voltage across ±5% of nominal 9.8 V. Its low 15 ppm/°C TCVR and 27 mV total ∆V_R over -40°C to +85°C ensure stability in unregulated environments.

Designed for low-power systems, it maintains regulation down to 150 µA knee current and supports up to 30 mA load while maintaining <4.0 Ω slope resistance. The SOT223 package provides 2 W power dissipation at 25°C ambient, with linear derating to 6 mA at 125°C.

Key Specifications

Pinout & Package

SOT223 package: 4-pin surface-mount outline with thermal pad (pin 4 floating or connected to pin 2 per datasheet top view). Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Trim, Pin 4 = Thermal tab / Anode tie.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF5098IDR and ADR439BRZ, the ZRT100GC1TA trades absolute accuracy for SOT223 compactness, zero-capacitor operation, and ultra-low knee current - making it optimal for cost-sensitive, space-constrained industrial sensors and battery-powered instrumentation.

Availability

ZRT100GC1TA is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, high-resolution data acquisition, and programmable power supply feedback requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for ZRT100GC1TA 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, with emphasis on precision, efficiency, and ruggedness for industrial and automotive markets.

The ZRT100 series was designed specifically for applications demanding stable, trimmable voltage references in compact surface-mount packages - targeting sensor interfaces, measurement equipment, and regulated power systems where board space and thermal constraints limit alternative solutions.

FAQ

What is the recommended external trim resistor value for ±5% adjustment?

The datasheet specifies a 100 kΩ potentiometer for full ±5% output adjustment. Use a 10-turn precision pot for production calibration; fixed resistor networks may be substituted if system-level error mapping confirms exact correction values. Do not short or leave the trim pin floating - connect to ground through the resistor network or leave open only if unused.

Can ZRT100GC1TA operate without an output capacitor?

Yes - the ZRT100GC1TA is internally compensated and stable without an external capacitor in most applications, as confirmed by Figure 2 in the original datasheet. Capacitors may be added for additional noise filtering in high-EMI environments, but they are not required for loop stability or regulation integrity.

How does the SOT223 thermal pad affect PCB layout requirements?

The SOT223 thermal pad (pin 4) must be soldered to a minimum 100 mm² copper pour with ≥4 thermal vias to internal ground planes. Failure to do so reduces power handling from 2 W to ≤0.8 W at 25°C ambient and increases thermal resistance by >25°C/W, risking output drift or premature failure under sustained 20 mA loads.

Is ZRT100GC1TA compatible with lead-free reflow profiles?

Yes - the SOT223 package is rated for JEDEC J-STD-020D-compliant lead-free reflow, with peak temperature tolerance up to 260°C for 30 seconds. Ensure preheat ramp rate stays within 3°C/s and avoid exceeding 220°C for more than 120 seconds to prevent die stress or bond wire degradation.