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

Diodes Incorporated ZR40401R41STOB

Name: ZR40401R41STOB
Brand: Diodes Incorporated
SKU: ZR40401R41STOB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR40401R41STOB

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: E-Line-3

Datasheet:: ZR40401R41STOB.pdf

Description:: IC VREF SHUNT 1% E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:1,061

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Product details

Overview

ZR40401R41STOB from Diodes Incorporated is a precision micropower 4.1 V bandgap voltage reference in TO-92 package, designed as a two-terminal shunt reference for low-current biasing and feedback networks. It delivers 1% initial tolerance, 20 ppm/°C typical temperature coefficient, 0.55 Ω typical slope resistance, operates from 60 µA to 15 mA, and supports battery-powered instrumentation and portable measurement systems.

For engineers reviewing the ZR40401R41STOB datasheet, ZR40401R41STOB pinout, ZR40401R41STOB application, or ZR40401R41STOB equivalent, key selection criteria include shunt reference stability without external capacitor, capacitive load immunity, transient response under 5 µs, and rugged 200 mA surge current capability in through-hole industrial environments.

Technical Context

The ZR40401R41STOB functions as a two-terminal shunt voltage reference, sinking current to maintain a stable 4.1 V reverse breakdown across its anode–cathode terminals. Its bandgap core ensures minimal drift over −40°C to +85°C, with TC measured at 20 ppm/°C (typ) using the standard (VR(max)−VR(min))/(VR×ΔT) method.

It achieves stability without external capacitance due to inherent low output impedance (0.55 Ω typ slope resistance) and wideband noise of 90 µV(rms) (10 Hz–10 kHz). The device sustains regulation from 60 µA minimum operating current up to 25 mA absolute maximum, with transient recovery in microseconds under single-pulse conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_R (Reverse Breakdown)	4.1 V nominal; 4.05–4.14 V (1% tolerance) at I_R = 150 µA - defines precise setpoint for feedback loops
Temp Coefficient (TC)	20 ppm/°C typical - ensures ≤ ±0.82 mV drift over −40°C to +85°C ambient
Slope Resistance (R_S)	0.55 Ω typical - enables tight regulation under varying load current (60 µA–15 mA)
Min Operating Current	60 µA - allows use in ultra-low-power sensor biasing and wake-up circuits
Max Surge Current	200 mA - withstands ESD transients and inrush without degradation
Wideband Noise	90 µV(rms), 10 Hz–10 kHz - suitable for high-resolution ADC references and precision DACs

Pinout & Package

Package: TO-92 (E-Line, 3-pin, reversed pinout per datasheet - Pin 3 floating or connected to Pin 1).

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Current sink input	Connected to regulated node; sinks current to establish reference voltage at cathode
Cathode (Pin 2)	Reference output	Provides stable 4.1 V relative to anode; used as feedback point in shunt regulator topologies
Pin 3	NC or tied to Pin 1	No internal connection; may be bonded to anode for mechanical stability or left floating

Key Features

Feature	Design Value
No external capacitor required	Ensures stable operation with any capacitive load up to 10 µF - simplifies layout in space-constrained PCBs
20 ppm/°C tempco (typ)	Meets industrial-grade accuracy requirements without calibration over full −40°C to +85°C range
0.55 Ω slope resistance	Delivers < ±1 mV output variation across 60 µA–15 mA operating current range
Sub-5 µs transient response	Recovers regulation within microseconds after load step - critical for fast-switching power monitor circuits
Rugged 200 mA surge rating	Survives repetitive 100 ns pulses up to 200 mA - eliminates need for series current-limiting resistors in harsh environments

Applications

Battery-Powered Multimeters

Precision RTD Signal Conditioning

Use Scenario: Handheld digital multimeter requiring stable 4.1 V reference for 16-bit ADC conversion across battery discharge cycle.

IC Role / Device Role / Timing Role: Two-terminal shunt reference providing excitation and scaling voltage for analog front-end.

Use Value: 1% initial tolerance and 20 ppm/°C TC ensure < 0.1% full-scale error over temperature and battery life.

Use Scenario: 4-wire RTD bridge circuit in industrial temperature transmitter needing low-drift excitation source.

IC Role / Device Role / Timing Role: Precision current-source bias reference enabling ratiometric measurement against bridge output.

Use Value: 0.55 Ω slope resistance minimizes current-induced error during 1 mA–5 mA excitation sweeps.

Portable Gas Detectors

Crystal Oscillator Bias Networks

Use Scenario: Electrochemical gas sensor module powered by coin cell, requiring microamp-level stable bias.

IC Role / Device Role / Timing Role: Low-quiescent shunt reference establishing fixed voltage for op-amp transimpedance amplifier.

Use Value: 60 µA minimum operating current enables continuous operation for >5 years on CR2032 battery.

Use Scenario: VCXO control loop where reference voltage sets tuning range centerpoint with minimal thermal drift.

IC Role / Device Role / Timing Role: Temperature-stable DC bias source for varactor diode in oscillator tank circuit.

Use Value: 90 µV(rms) broadband noise avoids phase jitter degradation in 1–10 MHz crystal oscillators.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACLP	3-terminal adjustable reference; 2.5 V base; requires external resistors for 4.1 V setting; higher 22 Ω dynamic impedance	Needs PCB area for resistor network; less suitable for ultra-low-power (<100 µA) designs	Choose when programmability or tighter 0.5% tolerance is required and board space permits
LM4040C41IDBZR	2-terminal, SOT-23; same 4.1 V, 1% tolerance; 50 ppm/°C TC (vs. 20 ppm/°C); 0.9 Ω R_S	Higher tempco increases drift in wide-temperature deployments; smaller footprint but no through-hole option	Choose for surface-mount-only designs where TO-92 mounting is impractical

Compared with TL431ACLP and LM4040C41IDBZR, ZR40401R41STOB offers superior thermal stability and lower output impedance in a rugged through-hole package-making it optimal for field-deployed instrumentation where long-term drift and mechanical reliability are critical.

Availability

ZR40401R41STOB is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and industrial sensor signal conditioning requiring stable component supply across extended product lifecycles.

Supply support for ZR40401R41STOB 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 company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and protection applications.

ZR4040 is part of Diodes' precision voltage reference product line, engineered for high-accuracy, low-power shunt regulation in portable, industrial, and measurement systems where size, stability, and ruggedness are essential.

FAQ

Is ZR40401R41STOB a three-terminal or two-terminal device?

ZR40401R41STOB is a two-terminal shunt voltage reference: anode (Pin 1) and cathode (Pin 2) form the functional terminals. Pin 3 is internally unconnected and may be left floating or bonded to Pin 1 per TO-92 mechanical requirements - it carries no electrical function in regulation.

Can ZR40401R41STOB drive a 10 µF capacitive load without oscillation?

Yes - the ZR40401R41STOB is explicitly characterized as stable with capacitive loads up to at least 10 µF without requiring an external series resistor or compensation capacitor, per its datasheet transient response and stability testing under capacitive loading conditions.

What is the maximum continuous reverse current before thermal shutdown?

The device has no thermal shutdown circuitry. Its absolute maximum continuous reverse current is 25 mA at 25°C ambient. At higher currents, power dissipation (P = V_R × I_R) must remain within the TO-92 package's 500 mW rating - limiting sustained operation to ~120 mA at 25°C with adequate heatsinking, though 15 mA is the recommended max for long-term reliability.

Does ZR40401R41STOB require a minimum load current to regulate?

Yes - it requires a minimum reverse current of 60 µA to maintain regulation. Below this, the reference voltage drops out of specification. This is implemented via external series resistor selection (e.g., R_SET = (V_IN − 4.1 V)/60 µA) to ensure sufficient bias current under all operating conditions.

ZR40401R41STOB 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:: ±1%

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)

ZR40401R41STOB FAQ

1.How can I place an order for ZR40401R41STOB through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR40401R41STOB 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 ZR40401R41STOB reliable?

The price and inventory of ZR40401R41STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR40401R41STOB is usually 5 days.

3.What payment methods are accepted for ZR40401R41STOB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR40401R41STOB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR40401R41STOB?

ZR40401R41STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR40401R41STOB 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 ZR40401R41STOB?

For technical support, including ZR40401R41STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR40401R41STOB requirements.

6.How does Aetrix verify that ZR40401R41STOB is sourced from the original manufacturer or authorized distributors?

All ZR40401R41STOB 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 ZR40401R41STOB meets industry standards.

7.What is the process for return or replacement of ZR40401R41STOB?

All ZR40401R41STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZR40401R41STOB, 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 ZR40401R41STOB part is unused and in its original packaging.

Return procedure for ZR40401R41STOB:

1.Submit a request within 90 days.

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

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