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

Diodes Incorporated ZR40402R25

Name: ZR40402R25
Brand: Diodes Incorporated
SKU: ZR40402R25
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR40402R25

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: TO-226-3, TO-92-3 (TO-226AA)

Datasheet:: ZR40402R25.pdf

Description:: IC VREF SHUNT 2% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:2,405

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Product details

Overview

ZR40402R25 from Diodes Incorporated is a precision 2.5 V micropower shunt voltage reference in E-Line (TO-92) package, featuring 2% 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, space-constrained reference in portable instrumentation and battery-powered data acquisition systems.

For engineers reviewing the ZR40402R25 datasheet, ZR40402R25 pinout, ZR40402R25 application, or ZR40402R25 equivalent, key selection criteria include reverse breakdown voltage stability over −40°C to +85°C, slope resistance ≤0.4 Ω, transient response <10 µs, and compatibility with capacitive loads up to 25 mA.

Technical Context

The ZR40402R25 employs a bandgap-based shunt topology, operating in reverse breakdown mode with no series pass element. Its internal design ensures regulation without requiring an external stabilization capacitor and maintains stability under varying capacitive load conditions.

It delivers 2.5 V reference voltage with ±2% initial accuracy at 150 µA test current, exhibits 30 ppm/°C typical TC over −40°C to +85°C, and supports dynamic load currents up to 25 mA while surviving transient surges up to 200 mA due to rugged 20 V process technology.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.5 V nominal; ±2% tolerance at 150 µA ensures predictable biasing in precision ADC references.
Temp. Coefficient	30 ppm/°C typical; enables ≤±1.25 mV drift over −40°C to +85°C for stable calibration.
Slope Resistance	0.4 Ω typical; minimizes output voltage shift under load current variation (e.g., <1 mV shift per 2.5 mA load change).
Operating Current	60 µA to 15 mA; supports ultra-low-power sensor nodes and high-current analog front-ends.
Transient Response	Stable in <10 µs; suitable for fast-switching power supply monitoring and dynamic reference switching.
Reverse Dynamic Impedance	0.3 Ω at 1 mA / 100 Hz; ensures low noise coupling into sensitive measurement circuits.
Wideband Noise	45 µV_rms (10 Hz–10 kHz); compatible with 16-bit+ data acquisition systems.

Pinout & Package

E-Line (TO-92) 3-pin through-hole package with pin 3 floating or connected to pin 1 per datasheet revision; standard lead form supports wave/solder reflow and manual prototyping.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode (input)	Connected to system ground or low-impedance return path; reverse-biased input node.
Pin 2	Cathode (output)	Provides regulated 2.5 V reference voltage; connects to load and feedback network.
Pin 3	NC or Anode tie	Not internally connected; may be tied to Pin 1 for mechanical stability per package variant.

Key Features

Feature	Design Value
No external capacitor required	Enables compact PCB layout in space-constrained handheld meters and sensor modules.
Stable with capacitive loads	Supports direct connection to ADC input capacitors or op-amp compensation networks without oscillation.
Sub-10 µs transient recovery	Allows use in fast-cycling battery management systems where reference must settle before sampling.
Rugged 200 mA surge rating	Withstands ESD events and inrush transients in industrial field instruments without derating.
Industrial temperature range	Validated operation from −40°C to +85°C ensures reliability in outdoor metering and factory-floor equipment.

Applications

Battery-Powered Portable Meters

Precision Data Acquisition Systems

Use Scenario: Handheld multimeters and clamp meters powered by AA/AAA cells requiring stable reference over full battery discharge curve.

IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and ADC reference for 12–16 bit SAR converters.

Use Value: 60 µA minimum operating current extends battery life >200 hours; 2% tolerance eliminates need for factory calibration trim.

Use Scenario: Modular DAQ units acquiring thermocouple, RTD, and strain gauge signals in lab and field environments.

IC Role / Device Role / Timing Role: Primary reference source for multi-channel simultaneous-sampling ADCs and programmable gain instrumentation amplifiers.

Use Value: 30 ppm/°C TC and 45 µV_rms noise enable <±0.02% total unadjusted error across temperature and bandwidth.

Industrial Process Instrumentation

Low-Power Sensor Transmitters

Use Scenario: 4–20 mA loop-powered pressure and flow transmitters operating in harsh plant environments.

IC Role / Device Role / Timing Role: Precision reference for DAC-based current loop control and sensor signal conditioning.

Use Value: Stable 2.5 V output under 15 mA load ensures consistent loop compliance voltage; TO-92 package withstands vibration and thermal cycling.

Use Scenario: Wireless IoT sensors (e.g., environmental monitors) using coin-cell batteries and intermittent wake-up cycles.

IC Role / Device Role / Timing Role: Micropower reference enabling sub-µA sleep current and rapid wake-up reference stabilization.

Use Value: <10 µs settling time allows immediate ADC conversion upon wake-up; 60 µA min current enables operation down to 1.8 V supply.

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	2.5 V adjustable via resistors; 2% tolerance; higher 0.22 Ω typical slope resistance; requires external resistor divider.	Used where programmability or higher current drive (>100 mA) is needed; less suited for fixed-voltage, ultra-low-power roles.	Select TL431ACLP only if adjustable reference or higher sink current capability is required.
REF3025AIDBZR	2.5 V fixed; 0.2% max tolerance; 50 ppm/°C max TC; 1.8 µA quiescent current; SOT23-3 package.	Preferred for high-accuracy, ultra-low-power applications (e.g., medical sensors); not rated for >10 mA continuous load.	Choose REF3025AIDBZR when <0.2% initial accuracy and sub-2 µA IQ outweigh cost and TO-92 mounting preference.

Compared with TL431ACLP and REF3025AIDBZR, ZR40402R25 offers optimal balance of fixed 2.5 V accuracy, TO-92 through-hole robustness, 60 µA–15 mA operational range, and sub-10 µs transient response-making it ideal for industrial portable instrumentation where reliability, ease of assembly, and dynamic performance are prioritized over ultra-fine tolerance.

Availability

ZR40402R25 is available at Aetrix Electronics and suitable for battery-powered portable meters, industrial process instrumentation, and precision data acquisition systems requiring stable component supply with long-term manufacturability.

Supply support for ZR40402R25 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 devices for power management, signal integrity, and protection applications.

ZR40402R25 belongs to the ZR4040 precision shunt reference product line, designed specifically for low-power, high-stability voltage referencing in portable, industrial, and test equipment where TO-92 mounting and capacitor-free operation are critical.

FAQ

Is ZR40402R25 stable without an external capacitor?

Yes. The ZR40402R25 uses an internal bandgap design that achieves inherent stability without requiring an external capacitor, even under capacitive loads up to 1 µF. This is confirmed in the datasheet's "No stabilising capacitor required" feature and transient response curves showing stable settling within 10 µs.

What is the maximum continuous reverse current rating?

The absolute maximum continuous reverse current is 25 mA, with recommended operation between 60 µA and 15 mA. The device can survive transient surges up to 200 mA due to its rugged 20 V process, but sustained operation above 25 mA exceeds absolute maximum ratings and risks permanent damage.

Can ZR40402R25 be used in place of a Zener diode?

Yes - it functions as a precision, low-drift replacement for general-purpose Zener diodes. Unlike standard Zeners, it provides guaranteed 2% tolerance, 30 ppm/°C TC, and stable regulation from 60 µA, making it suitable for applications where Zener voltage drift and poor TC would degrade accuracy.

Does the E-Line (TO-92) package have a defined pin 1 marking?

No. Per the datasheet ordering table, the ZR40402R25 uses the E-Line 3-pin package with "*" indicating no partmark on the body; pin identification relies on mechanical orientation (flat side facing viewer, leads down): left = Pin 1 (Anode), center = Pin 2 (Cathode), right = Pin 3 (NC or tied to Pin 1).

ZR40402R25 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: TO-226-3, TO-92-3 (TO-226AA)

Series:: -

Packaging:: Bulk

Product Status:: Obsolete

Reference Type:: Shunt

Output Type:: Fixed

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: -

Current - Output:: 15 mA

Tolerance:: ±2%

Temperature Coefficient:: 100ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 45µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 60 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-92

ZR40402R25 FAQ

1.How can I place an order for ZR40402R25 through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR40402R25 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 ZR40402R25 reliable?

The price and inventory of ZR40402R25 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR40402R25 is usually 5 days.

3.What payment methods are accepted for ZR40402R25?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR40402R25 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR40402R25?

ZR40402R25 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR40402R25 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 ZR40402R25?

For technical support, including ZR40402R25 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR40402R25 requirements.

6.How does Aetrix verify that ZR40402R25 is sourced from the original manufacturer or authorized distributors?

All ZR40402R25 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 ZR40402R25 meets industry standards.

7.What is the process for return or replacement of ZR40402R25?

All ZR40402R25 units undergo pre-shipment inspection (PSI). If there is an issue with ZR40402R25, 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 ZR40402R25 part is unused and in its original packaging.

Return procedure for ZR40402R25:

1.Submit a request within 90 days.

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

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