Diodes Incorporated ZRT040GC1TA

Overview

ZRT040GC1TA from Diodes Incorporated is a monolithic 4.01V precision voltage reference IC with ±1% initial tolerance, 150μA knee current, and operation from –40°C to +85°C. It delivers stable output at 500μA, features trimmable output via external resistor, and is housed in SOT223 for surface-mount power-sensitive analog systems including data acquisition and sensor signal conditioning.

For engineers reviewing the ZRT040GC1TA datasheet, ZRT040GC1TA pinout, ZRT040GC1TA application, or ZRT040GC1TA equivalent, key selection criteria include temperature coefficient (15–50 ppm/°C), slope resistance (1.1–3.0 Ω), low-noise performance (50 µV_p-p, 0.1–10 Hz), trim range (±5%), and absence of required external stabilization capacitor.

Technical Context

The ZRT040GC1TA implements a bandgap-derived reference core with integrated trim node, enabling post-assembly calibration of output voltage across ±5% using an external potentiometer or fixed resistor. Its low 150μA knee current supports ultra-low-power biasing in battery-operated instrumentation.

Temperature stability is achieved through curvature-compensated bandgap design, yielding 7.5 mV max ΔV_R over –40°C to +85°C and 15–50 ppm/°C TC_VR. Slope resistance remains under 3.0 Ω across 0.5–5 mA operating current, ensuring minimal load regulation error.

Key Specifications

Pinout & Package

SOT223 package: 4-pin thermally enhanced surface-mount outline with exposed thermal pad (pin 4 floating or tied to GND/pin 2 per application). Pin 1 = TRIM, Pin 2 = GND, Pin 3 = V_R, Pin 4 = thermal tab / optional GND connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3040AIDBZR and ADR3440ARJZ-R7, the ZRT040GC1TA uniquely provides ±5% analog trim capability at 4.01V while maintaining sub-50 ppm/°C tempco and 150 μA knee current-making it optimal for cost-sensitive, field-calibratable industrial sensors where 4.01V aligns with legacy 4V-based scaling.

Availability

ZRT040GC1TA is available at Aetrix Electronics and suitable for industrial data acquisition, medical sensor interfaces, and automotive cabin electronics requiring stable component supply with guaranteed long-term continuity.

Supply support for ZRT040GC1TA 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, cost-optimized components for industrial, computing, and consumer markets.

The ZRT series targets precision analog applications demanding low-cost, trimmable references with robust thermal performance-designed specifically for sensor signal conditioning, data converter biasing, and closed-loop calibration in resource-constrained systems.

FAQ

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

The datasheet specifies a 100 kΩ ±5% resistor between TRIM and GND to achieve the full ±5% output range. Using a 10-turn potentiometer in this configuration allows fine-grained calibration during production test. Resistor tolerance directly impacts final accuracy-tighter tolerance (e.g., 1%) improves repeatability but adds cost.

Can the TRIM pin be left unconnected without affecting stability?

Yes-the TRIM pin is internally biased and functions correctly when left open-circuit. No leakage or instability occurs. This configuration delivers the nominal 4.01V output with ±1% initial tolerance and full specified temperature performance. Open-circuit use eliminates external components and simplifies layout for non-calibrated applications.

Is a bypass capacitor required on the V_R output?

No external capacitor is required for stability per the datasheet. The ZRT040GC1TA is internally compensated and remains stable driving capacitive loads up to 1 nF. A 100 nF ceramic capacitor may be added locally if driving high-speed switching loads (e.g., SAR ADC sample capacitors) to suppress transient current spikes and reduce noise coupling.

How does the SOT223 thermal pad affect long-term reliability?

The exposed thermal pad (pin 4) significantly improves thermal resistance-reducing junction-to-ambient by ~25°C/W when soldered to a 1-in² 2-oz copper pour. This lowers steady-state junction temperature, extending MTTF and reducing parametric drift over time. Diodes Incorporated recommends connecting the pad to GND for both thermal and EMI performance.