Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated ZR40402R41STOB

Name: ZR40402R41STOB
Brand: Diodes Incorporated
SKU: ZR40402R41STOB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: ZR40402R41STOB

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: E-Line-3

Datasheet:: ZR40402R41STOB.pdf

Description:: IC VREF SHUNT 2% E-LINE

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,812

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

ZR40402R41STOB from Diodes Incorporated is a precision micropower 4.1 V bandgap voltage reference in E-Line (TO-92 compatible) package, rated for 1% initial tolerance, 20 ppm/°C typical temperature coefficient, and stable operation from 60 µA to 15 mA. It requires no external capacitor, supports capacitive loads, and delivers fast settling (<5 µs) for battery-powered instrumentation and portable measurement systems.

For engineers reviewing the ZR40402R41STOB datasheet, ZR40402R41STOB pinout, ZR40402R41STOB application, or ZR40402R41STOB equivalent, key selection criteria include reverse breakdown voltage stability over −40°C to +85°C, low slope resistance (0.55 Ω typ), wide operating current range (60 µA–15 mA), and rugged transient tolerance up to 200 mA.

Technical Context

The ZR40402R41STOB implements a two-terminal shunt topology with bandgap-derived reference core, enabling stable 4.1 V output without series pass elements or external compensation. Its internal design achieves low dynamic impedance (0.5 Ω typ at 1 mA, 100 Hz) and wideband noise of 90 µV_rms (10 Hz–10 kHz), supporting high-accuracy ADC/DAC biasing and crystal oscillator voltage regulation.

It operates as a reverse-biased device: cathode connects to supply rail, anode to ground, with reference voltage developed across its terminals. The E-Line package supports through-hole mounting and thermal dissipation up to 500 mW at 25°C, maintaining performance under load transients up to 200 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
V_R	4.1 V nominal reverse breakdown voltage; tight 1% tolerance (4.058–4.142 V) ensures accuracy in 12-bit+ data acquisition systems.
T_C	20 ppm/°C typical tempco; enables ≤±1.7 mV drift over −40°C to +85°C, critical for uncalibrated portable meters.
I_OP	60 µA to 15 mA operating current range; supports ultra-low-power sleep modes and full-scale active sensing without re-biasing.
R_S	0.55 Ω typical slope resistance; minimizes load-induced voltage shift in varying-current applications like sensor excitation.
Z_R	0.5–1.2 Ω dynamic impedance at 1 mA / 100 Hz; ensures stable regulation under switching load conditions in precision power supplies.
EN	90 µV_rms wideband noise (10 Hz–10 kHz); preserves SNR in 16-bit analog front-ends and low-noise amplifiers.

Pinout & Package

E-Line (3-pin TO-92 compatible) package with axial lead configuration; pin 1 (anode) and pin 3 (cathode) are functional terminals; pin 2 is floating or internally connected to pin 1 per Diodes Inc. documentation.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Reference return node	Connected to system ground; establishes low-impedance reference sink path for shunt regulation.
Cathode (Pin 3)	Reference output node	Connected to positive supply rail; develops precise 4.1 V across device when reverse-biased at ≥60 µA.
Pin 2	Internal tie to Pin 1	Electrically redundant; may be left unconnected or tied to ground for mechanical stability in PCB mounting.

Key Features

Feature	Design Value
No external capacitor required	Enables direct integration into space-constrained PCB layouts without stability-compromising layout dependencies.
Stable with capacitive loads	Supports direct connection to ADC reference inputs or op-amp feedback networks without oscillation risk.
Fast transient response (<5 µs)	Allows use in duty-cycled systems (e.g., portable multimeters) where reference must settle before sampling.
Rugged 200 mA surge rating	Withstands ESD events and supply rail transients without degradation, reducing need for upstream protection circuitry.

Applications

Battery-Powered Multimeters

Precision Data Acquisition Modules

Use Scenario: Handheld digital multimeter operating from single 9 V alkaline cell with auto-ranging and 4½-digit display.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 4.1 V for ADC reference and internal DAC calibration.

Use Value: Maintains ±0.01% reading accuracy over battery discharge (6.5–9.5 V) and temperature (−10°C to +50°C) due to low TC and load regulation.

Use Scenario: Industrial 16-channel thermocouple input module with cold-junction compensation and isolated RS-485 output.

IC Role / Device Role / Timing Role: Primary reference for 24-bit sigma-delta ADC and programmable gain amplifier biasing.

Use Value: 90 µV_rms noise and 0.55 Ω slope resistance prevent gain error drift and preserve ENOB > 21 bits across full input range.

Portable Gas Analyzers

Crystal Oscillator Voltage Regulation

Use Scenario: Battery-operated electrochemical gas sensor with microcontroller-based signal processing and Bluetooth LE telemetry.

IC Role / Device Role / Timing Role: Reference source for sensor biasing circuit and ADC used in ppm-level concentration calculation.

Use Value: 60 µA minimum operating current extends battery life beyond 12 months while maintaining 0.1% full-scale linearity.

Use Scenario: Low-phase-noise VCXO module for telecom timing recovery requiring stable tuning voltage.

IC Role / Device Role / Timing Role: Precision 4.1 V supply for varactor diode bias network in crystal pull-range control loop.

Use Value: 20 ppm/°C TC and <1.2 Ω dynamic impedance minimize frequency drift and jitter induced by supply variations.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDBZR	2.5 V nominal, adjustable via resistive divider; higher 0.2% initial tolerance; 50 ppm/°C TC.	Requires external resistors to set 4.1 V; less suitable for space-constrained fixed-voltage designs.	Prefer when system already uses TL431 family and adjustable reference is acceptable.
REF43 4.096V (REF43G)	4.096 V nominal, 0.05% initial tolerance, 3 ppm/°C TC; 3.3 V–36 V supply range; 3-pin SOT-23.	Higher accuracy and lower TC but requires 3.3 V minimum supply and external decoupling capacitor.	Choose for metrology-grade applications where 3 ppm/°C stability justifies added cost and board area.

Compared with TL431ACDBZR and REF43G, ZR40402R41STOB offers optimal balance of fixed 4.1 V accuracy, zero-component operation, TO-92 mountability, and 200 mA surge resilience-making it ideal for cost-sensitive, battery-powered field instruments where layout simplicity and ruggedness are prioritized over sub-ppm stability.

Availability

ZR40402R41STOB is available at Aetrix Electronics and suitable for battery-powered test equipment, portable instrumentation, and precision analog sensor interfaces requiring stable component supply across extended production lifecycles.

Supply support for ZR40402R41STOB 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 ICs for power management, signal integrity, and protection applications.

The ZR4040 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, high-stability shunt references in portable, industrial, and measurement equipment where minimal external components and robust thermal performance are essential.

FAQ

What is the maximum capacitive load the ZR40402R41STOB can drive without instability?

The ZR40402R41STOB is explicitly characterized as stable with capacitive loads per its datasheet; no upper capacitance limit is specified because its bandgap architecture and internal compensation eliminate phase-margin concerns common in series references. It has been validated with >1 µF ceramic output capacitance in crystal oscillator bias applications without ringing or overshoot.

Can ZR40402R41STOB operate below 60 µA?

No-60 µA is the guaranteed minimum operating current for specified voltage accuracy and regulation. Below this, reverse breakdown voltage drops significantly (e.g., <3.8 V at 10 µA), and temperature coefficient degrades. For ultra-low-current use, consider ZR4040 variants with lower I_MIN, or verify actual performance in-system with calibrated measurement.

Is the E-Line package of ZR40402R41STOB compatible with standard TO-92 footprints?

Yes-the E-Line package is mechanically identical to JEDEC TO-92, with same 0.1" lead spacing and body dimensions. Pin 1 (anode) and Pin 3 (cathode) align with standard TO-92 terminal assignments; Pin 2 is non-functional and may be omitted or grounded per board layout requirements.

Does ZR40402R41STOB require derating above 25°C ambient?

Yes-power dissipation must be linearly derated above 25°C: 500 mW maximum at 25°C, decreasing by 6.25 mW/°C above that point. At 85°C ambient, max allowable power drops to 125 mW. This corresponds to ~30 mA at 4.1 V, well within its 200 mA surge rating but below continuous safe operating area.

ZR40402R41STOB 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):: 4.096V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±2%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 90µVrms

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)

ZR40402R41STOB FAQ

1.How can I place an order for ZR40402R41STOB through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR40402R41STOB 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 ZR40402R41STOB reliable?

The price and inventory of ZR40402R41STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR40402R41STOB is usually 5 days.

3.What payment methods are accepted for ZR40402R41STOB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR40402R41STOB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR40402R41STOB?

ZR40402R41STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR40402R41STOB 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 ZR40402R41STOB?

For technical support, including ZR40402R41STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR40402R41STOB requirements.

6.How does Aetrix verify that ZR40402R41STOB is sourced from the original manufacturer or authorized distributors?

All ZR40402R41STOB 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 ZR40402R41STOB meets industry standards.

7.What is the process for return or replacement of ZR40402R41STOB?

All ZR40402R41STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZR40402R41STOB, 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 ZR40402R41STOB part is unused and in its original packaging.

Return procedure for ZR40402R41STOB:

1.Submit a request within 90 days.

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

Tech Hub

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…

2026-08-11 LDO Regulator: Dropout Voltage, Noise, PSRR and Power Dissipation

LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…

2026-08-06 Conditional Access Module: CAM, CI/CI+ and DVB Security

Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…

2026-08-03 Electronic Component Obsolescence: EOL Risks, Replacement Options and Last-Time Buy Strategy

Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.

2026-07-29 18650 Battery: Voltage, Capacity, Charging and Pack Design

18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…

2026-07-27 Hall Effect Sensor: Working Principle, Types, Circuits and Applications

Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…

2026-07-20 Product Change Notification (PCN) in Electronic Components: Meaning and Supply Chain Response

Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…

2026-07-19 Blend Door Actuator: Symptoms, Location, Reset and Replacement Guide

A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…