Diodes Incorporated ZR40401R25

Overview

ZR40401R25 from Diodes Incorporated is a precision 2.5 V micropower shunt voltage reference in TO-92 package, featuring 1% initial tolerance, 30 ppm/°C typical temperature coefficient, and stable operation from 60 µA to 15 mA without external capacitor. It serves as a low-power, high-stability reference in battery-powered instrumentation and data acquisition systems.

For engineers reviewing the ZR40401R25 datasheet, ZR40401R25 pinout, ZR40401R25 application, or ZR40401R25 equivalent, key selection criteria include reverse breakdown voltage accuracy, slope resistance (0.4 Ω typ), transient response (<10 µs), TC performance across –40°C to +85°C, and compatibility with capacitive loads in space-constrained designs.

Technical Context

The ZR40401R25 employs a bandgap-based shunt topology that regulates voltage by sinking adjustable current through its cathode–anode path. Its internal design eliminates need for external stabilization capacitance while maintaining stability under varying load capacitance and supply transients.

It operates as a two-terminal device with defined reverse breakdown behavior: VR = 2.5 V at IR = 150 µA, with slope resistance of 0.4 Ω (typ) ensuring minimal output voltage shift over operating current range (60 µA–15 mA). Absolute maximum reverse current is 25 mA, with transient survivability up to 200 mA.

Key Specifications

Pinout & Package

Package: E-Line (TO-92), 3-pin through-hole, suffix R. Pin 3 is floating or internally connected to Pin 1 per datasheet revision notes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDBZR and REF43GM, ZR40401R25 offers optimal balance of 1% accuracy, ultra-low quiescent current (60 µA), capacitor-free operation, and TO-92 manufacturability-making it ideal for cost-sensitive, space-constrained, battery-operated instrumentation where <10 µs transient response is critical.

Availability

ZR40401R25 is available at Aetrix Electronics and suitable for battery-powered portable equipment, metering and measurement systems, and precision power supplies requiring stable component supply with consistent parametric performance across production lots.

Supply support for ZR40401R25 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, headquartered in Plano, Texas, serving industrial, computing, consumer, and communications markets with high-reliability components.

The ZR4040 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, high-accuracy applications in portable and measurement equipment where size, stability, and ease of use are prioritized over programmability.

FAQ

What is the recommended operating current range for ZR40401R25?

The ZR40401R25 is specified for reliable operation between 60 µA and 15 mA. At 60 µA, it achieves full accuracy and stability; above 15 mA, power dissipation exceeds the TO-92 package's 500 mW rating at 25°C ambient. Operation up to 25 mA is permitted only for short-duration transients, not continuous use.

Does ZR40401R25 require an external capacitor for stability?

No. The ZR40401R25 is internally compensated and remains stable without any external capacitor-even when driving capacitive loads such as ADC input stages or op-amp feedback networks. This simplifies layout and reduces BOM count in space-constrained designs.

How does the ZR40401R25 perform under temperature variation?

Over –40°C to +85°C, the ZR40401R25 maintains 1% initial tolerance with a typical temperature coefficient of 30 ppm/°C. Measured deviation is ≤±0.75 mV across the full range, verified per the TC formula in the datasheet using VR(max)–VR(min) at extreme temperatures.

Can ZR40401R25 replace ZR40402R25 in existing designs?

Yes-ZR40401R25 is a direct functional replacement for ZR40402R25 with identical TO-92 package, pinout, and electrical characteristics except for tighter 1% initial tolerance (vs. 2%). No layout or schematic changes are needed; improved accuracy may reduce or eliminate system-level calibration steps.