Diodes Incorporated ZR40401R50STOA

Overview

ZR40401R50STOA from Diodes Incorporated is a precision 5.0 V micropower shunt voltage reference using bandgap circuitry, operating stably from 60 µA to 15 mA with no external capacitor required. It delivers 1% initial tolerance, 20 ppm/°C typical temperature coefficient, and 0.33 Ω typical slope resistance in an E-Line (TO-92 compatible) package, used for calibration and regulation in portable instrumentation and battery-powered data acquisition systems.

For engineers reviewing the ZR40401R50STOA datasheet, ZR40401R50STOA pinout, ZR40401R50STOA application, or ZR40401R50STOA equivalent, key selection criteria include low-quiescent-current stability, capacitive-load immunity, transient response under 10 µs, and automotive-grade temperature range (–55°C to +125°C) without external compensation.

Technical Context

The ZR40401R50STOA functions as a two-terminal shunt reference, sinking current to maintain a precise 5.0 V reverse breakdown voltage across its cathode-anode terminals. Its bandgap core ensures stable output under varying load and temperature, with slope resistance of 0.33 Ω (typ) enabling tight regulation even with dynamic current changes.

It operates without external stabilization capacitance and remains stable with capacitive loads up to 10 µF. Transient recovery settles within 10 µs, and absolute maximum reverse current is rated at 25 mA - with ruggedized processing allowing survival of 200 mA transients.

Key Specifications

Pinout & Package

E-Line (3-pin TO-92 compatible) package with reversed pinout: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = floating or internally connected to Pin 1 per datasheet revision.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL431ACDBZR and ADR3450ARJZ-R7, the ZR40401R50STOA uniquely balances micropower operation (60 µA), capacitor-free stability, TO-92 compatibility, and 1% tolerance - making it optimal for cost-sensitive, space-constrained, battery-operated systems where simplicity and ruggedness outweigh ultra-high precision.

Availability

ZR40401R50STOA is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor transmitters, and automotive cabin air quality monitoring requiring stable component supply with long-term lifecycle visibility.

Supply support for ZR40401R50STOA 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 protection solutions.

The ZR4040 series belongs to Diodes' precision voltage reference product line, engineered for low-power, high-stability applications in portable, industrial, and automotive environments where minimal external components and robust thermal performance are critical.

FAQ

What is the minimum operating current for reliable regulation?

The ZR40401R50STOA maintains regulation down to 60 µA at 25°C, with a guaranteed minimum of 30 µA across –55°C to +125°C. Below this threshold, output voltage deviates nonlinearly and should be avoided in production designs.

Can this device drive a 10 nF capacitive load directly?

Yes - the ZR40401R50STOA is explicitly characterized as stable with capacitive loads up to 10 µF. A 10 nF load falls well within this specification and introduces no phase margin degradation or ringing in typical PCB layouts.

Is the E-Line package thermally equivalent to standard TO-92?

The E-Line package uses TO-92 pin geometry but features reversed pin 1/3 connectivity and slightly improved thermal resistance (150°C/W vs. 200°C/W for standard TO-92). It is mechanically compatible but electrically distinct in pin mapping.

Does the 1% tolerance include temperature drift effects?

No - the 1% tolerance refers only to initial accuracy at 25°C and 150 µA. Total error over temperature includes both initial tolerance and tempco-induced drift; worst-case deviation across –55°C to +125°C is ±(1% + 0.0125%) = ±1.0125% for the 40 ppm/°C max spec.