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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Reference

Diodes Incorporated ZR40401R50STOB

Name: ZR40401R50STOB
Brand: Diodes Incorporated
SKU: ZR40401R50STOB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR40401R50STOB

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: E-Line-3

Datasheet:: ZR40401R50STOB.pdf

Description:: IC VREF SHUNT 1% E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:3,927

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Product details

Overview

ZR40401R50STOB from Diodes Incorporated is a precision 5.0 V micropower shunt voltage reference using bandgap circuitry, designed for low-current regulation in battery-powered systems. It delivers 1% initial tolerance, 20 ppm/°C typical temperature coefficient, 0.33 Ω typical slope resistance, and stable operation from 60 µA to 15 mA - enabling use in portable instrumentation and data acquisition front-ends.

For engineers reviewing the ZR40401R50STOB datasheet, ZR40401R50STOB pinout, ZR40401R50STOB application, or ZR40401R50STOB equivalent, key selection criteria include micropower operating current range, TC performance across –55°C to +125°C, capacitive load stability without external compensation, and rugged 200 mA transient surge capability.

Technical Context

The ZR40401R50STOB operates 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 monotonic TC behavior and low dynamic impedance (0.4 Ω typical at 1 mA, 100 Hz).

It achieves sub-10 µs transient settling time and remains stable with capacitive loads up to 10 nF - eliminating need for external stabilization capacitors. The device supports automotive-grade temperature operation (–55°C to +125°C) and withstands 200 mA surge currents due to 20 V process hardening.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	5.00 V ±1% at 150 µA, ensuring accurate ADC/DAC biasing in precision analog signal chains
Temp. Coefficient	20 ppm/°C typical (–40°C to +85°C), minimizing drift in metering and sensor conditioning circuits
Slope Resistance	0.33 Ω typical, enabling tight regulation under varying load current (60 µA–15 mA)
Dynamic Impedance	0.4 Ω at 1 mA / 100 Hz, reducing AC error in feedback loops and reference buffers
Wideband Noise	105 µV_rms (10 Hz–10 kHz), suitable for high-resolution 16-bit+ data acquisition systems
Min Operating Current	60 µA, allowing direct use with ultra-low-power microcontrollers and RTCs

Pinout & Package

E-Line (TO-92 reversed) 3-pin through-hole package with pin 3 floating or connected to pin 1 per datasheet diagram 4-184; no thermal pad or exposed metal.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Reference return path	Connected to system ground; sinks current to regulate cathode voltage at 5.0 V
Cathode (Pin 2)	Regulated output node	Provides stable 5.0 V reference voltage; connects to ADC REF+, op-amp non-inverting input, or DAC bias
Pin 3	No-connect or tied to Pin 1	Internally unconnected; may be bonded to anode for mechanical stability but carries no electrical function

Key Features

Feature	Design Value
No external capacitor required	Enables compact PCB layout in space-constrained portable designs without stability trade-offs
Sub-10 µs transient response	Supports fast power-up sequencing and dynamic load switching in battery management ICs
Rugged 200 mA surge rating	Survives ESD events and inrush transients without derating or external protection
Automotive temperature range	Validated operation from –55°C to +125°C for engine control and industrial monitoring

Applications

Battery-Powered Portable Meters

Precision Data Acquisition Front-Ends

Use Scenario: Handheld multimeters and clamp meters powered by single-cell Li-ion or alkaline batteries.

IC Role / Device Role / Timing Role: Shunt reference providing stable 5.0 V for 24-bit sigma-delta ADC excitation and internal LDO biasing.

Use Value: 60 µA minimum operating current extends battery life beyond 12 months; 1% tolerance eliminates factory calibration steps.

Use Scenario: Industrial PLC analog input modules measuring 4–20 mA sensor signals.

IC Role / Device Role / Timing Role: Precision voltage reference for programmable gain instrumentation amplifiers and ADC reference buffers.

Use Value: 20 ppm/°C TC ensures <±0.02% full-scale error over –25°C to +70°C ambient, meeting IEC 61000-6-2 immunity requirements.

Portable Medical Sensors

Low-Power RTU Reference Subsystem

Use Scenario: Wearable pulse oximeters requiring ultra-low quiescent current and medical-grade accuracy.

IC Role / Device Role / Timing Role: Primary voltage reference for LED driver current control and photodiode transimpedance amplifier biasing.

Use Value: 105 µV_rms noise floor prevents SNR degradation in sub-100 nA photocurrent measurements.

Use Scenario: Remote telemetry units deployed in unheated outdoor cabinets with wide ambient swings.

IC Role / Device Role / Timing Role: Stable 5.0 V source for microcontroller VREF, RTC backup, and isolated CAN transceiver bias.

Use Value: Operation down to –55°C and up to +125°C enables reliable long-term deployment without thermal derating.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDBVR	2.5 V nominal output, adjustable via resistive divider; 2% initial tolerance; higher 600 µA min current	Requires external resistors to set 5 V; unsuitable for space-constrained layouts where fixed 5 V is needed	Select when adjustable reference or higher output current (>100 mA) is required
LM4040C50IDBZR	5.0 V fixed, 0.5% tolerance, 50 ppm/°C max TC, SOT23-3 package	Lower TC drift but requires 75 µA min current and external 1 nF capacitor for stability	Select when tighter initial accuracy is critical and board area allows SOT23 footprint

Compared with TL431ACDBVR and LM4040C50IDBZR, ZR40401R50STOB offers superior micropower operation (60 µA min), no external capacitor dependency, and TO-92 compatibility for legacy through-hole manufacturing - making it optimal for cost-sensitive, high-volume portable instrumentation.

Availability

ZR40401R50STOB is available at Aetrix Electronics and suitable for battery-powered portable meters, precision data acquisition front-ends, and low-power RTU reference subsystems requiring stable component supply and long-lifecycle availability.

Supply support for ZR40401R50STOB 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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal devices for industrial, computing, consumer, and communications markets.

ZR4040 is part of Diodes' precision voltage reference product line, engineered for high-accuracy, low-power regulation in portable, automotive, and industrial measurement systems.

FAQ

What is the maximum reverse current ZR40401R50STOB can safely handle?

The absolute maximum reverse current is 25 mA continuous, but the device is rated for transient surges up to 200 mA due to its 20 V process hardening. Sustained operation above 15 mA increases self-heating and may exceed 330 mW power dissipation limit in SOT23 packages; the E-Line TO-92 variant supports 500 mW at 25°C ambient.

Does ZR40401R50STOB require an external capacitor for stability?

No - the ZR40401R50STOB is internally compensated and remains stable with capacitive loads up to 10 nF without any external capacitor. This eliminates layout complexity and component count in space-constrained applications such as handheld test equipment and wearable sensors.

How does the temperature coefficient behave across the full –55°C to +125°C range?

Over –55°C to +125°C, the average temperature coefficient is 40 ppm/°C max (125 ppm/°C worst-case), measured between IR(min) and IR(max). At the narrower –40°C to +85°C range, typical TC is 20 ppm/°C, supporting high-accuracy applications like portable calibrators and field-deployed sensors.

Can ZR40401R50STOB be used in series with other references or regulators?

No - ZR40401R50STOB is a two-terminal shunt reference and must be connected in parallel with the load. It cannot be placed in series with another reference or regulator. For series (three-terminal) operation, consider the ZR431 family or discrete op-amp-based reference designs.

ZR40401R50STOB Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: E-Line-3

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 5V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±1%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 105µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 60 µA

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: E-Line (TO-92 compatible)

ZR40401R50STOB FAQ

1.How can I place an order for ZR40401R50STOB through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR40401R50STOB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for ZR40401R50STOB reliable?

The price and inventory of ZR40401R50STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR40401R50STOB is usually 5 days.

3.What payment methods are accepted for ZR40401R50STOB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR40401R50STOB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR40401R50STOB?

ZR40401R50STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR40401R50STOB order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for ZR40401R50STOB?

For technical support, including ZR40401R50STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR40401R50STOB requirements.

6.How does Aetrix verify that ZR40401R50STOB is sourced from the original manufacturer or authorized distributors?

All ZR40401R50STOB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ZR40401R50STOB meets industry standards.

7.What is the process for return or replacement of ZR40401R50STOB?

All ZR40401R50STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZR40401R50STOB, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The ZR40401R50STOB part is unused and in its original packaging.

Return procedure for ZR40401R50STOB:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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