Diodes Incorporated ZRT025GC1TA

Overview

ZRT025GC1TA from Diodes Incorporated is a 2.5V monolithic precision voltage reference IC with 1% initial tolerance, 15–50 ppm/°C temperature coefficient, and trimmable output via external resistor (±5% range). It operates from 150μA to 75mA, delivers 2.475–2.525V at 500μA, and targets high-accuracy analog signal conditioning in industrial sensor interfaces.

For engineers reviewing the ZRT025GC1TA datasheet, ZRT025GC1TA pinout, ZRT025GC1TA application, or ZRT025GC1TA equivalent, key selection criteria include its ±5% trim capability, low 50µV_P-P (0.1–10Hz) noise, SOT223 package compatibility, and absence of required external stabilization capacitors in most designs.

Technical Context

The ZRT025GC1TA implements a bandgap-based reference core with integrated trim node, enabling post-assembly calibration of system-level offset errors. Its slope resistance (0.85–2.0Ω) and line regulation performance support stable operation across wide input current (0.15–75mA) and temperature (−40°C to +85°C) ranges.

Unlike shunt references requiring external cathode resistors, this device functions as a two-terminal series reference with dedicated TRIM pin (Pin 1), allowing precise adjustment without altering basic biasing. The trim circuitry maintains TCVR shift ≤2.5 ppm/°C across the full ±5% output span.

Key Specifications

Pinout & Package

Package: SOT223 (4-pin, Pin 4 internally floating or tied to Pin 2 per datasheet).

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3025AIDBZR and ADR3425ARJZ-R7, the ZRT025GC1TA uniquely provides ±5% output adjustability in an SOT223 package-enabling post-PCB calibration of gain/offset errors without redesign, while maintaining competitive tempco and noise performance at lower cost.

Availability

ZRT025GC1TA is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable data loggers, PLC analog I/O modules, and medical diagnostic equipment requiring stable component supply across multi-year production cycles.

Supply support for ZRT025GC1TA 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 power management, signal integrity, and precision analog solutions.

The ZRT025 product line delivers low-power, trimmable voltage references optimized for industrial automation, test equipment, and medical instrumentation where system-level calibration and long-term stability are critical.

FAQ

What is the recommended external trim resistor value for ZRT025GC1TA?

The datasheet specifies a 100kΩ ±5% potentiometer for full ±5% output adjustment. Use a low-tempco (≤100 ppm/°C) cermet or metal-film potentiometer mounted close to the device to minimize parasitic pickup. Avoid carbon composition types due to instability and noise.

Can Pin 4 (NC) be connected to ground or left floating?

Per the official datasheet, Pin 4 is internally unconnected or tied to Pin 2 (GND). It may be left floating or connected to Pin 2 with no functional impact. Do not connect it to any other potential, as this could compromise thermal performance or reliability.

Does ZRT025GC1TA require an output capacitor for stability?

No. The ZRT025GC1TA is designed for unconditional stability without an external output capacitor in most applications. Only add a 100nF ceramic capacitor if operating near the 75mA upper current limit or in high-EMI environments where additional noise suppression is empirically verified necessary.

How does the trim function affect temperature coefficient?

Trimming shifts the output voltage but introduces only ≤2.5 ppm/°C additional temperature coefficient variation across the full ±5% range. This is specified as TCVTRIM in the datasheet and remains negligible compared to the base TCVR (15–50 ppm/°C), preserving overall thermal stability.