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

Diodes Incorporated ZR40402F25TC

Name: ZR40402F25TC
Brand: Diodes Incorporated
SKU: ZR40402F25TC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR40402F25TC

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: ZR40402F25TC.pdf

Description:: IC VREF SHUNT 2% SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:4,494

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Product details

Overview

ZR40402F25TC from Diodes Incorporated is a precision 2.5 V micropower shunt voltage reference IC using bandgap circuitry, operating from 60 µA to 15 mA with no external capacitor required. It delivers 0.5% initial tolerance, 30 ppm/°C typical temperature coefficient, and stable performance up to 200 mA transient current in SOT23-3 package - used in battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the ZR40402F25TC datasheet, ZR40402F25TC pinout, ZR40402F25TC application, or ZR40402F25TC equivalent, key selection criteria include low quiescent current (60 µA min), capacitive-load stability, sub-10 µs transient response, and industrial-grade (-40°C to +85°C) operation without output capacitance.

Technical Context

The ZR40402F25TC functions as a two-terminal shunt reference, sinking current to regulate a stable 2.5 V at the cathode when reverse-biased. Its bandgap core ensures predictable voltage drift over temperature and load, with slope resistance of 0.4 Ω (typ) enabling tight regulation under varying current conditions.

It operates without external stabilization components and maintains stability with capacitive loads up to 10 nF. The device withstands transients up to 200 mA and achieves full regulation within 10 µs after input step changes, supporting fast-switching power monitoring and precision ADC biasing.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	2.5 V ±0.5% (initial accuracy); enables direct 2.5 V bias for 12-bit+ SAR ADCs without trimming
Temp. Coefficient	30 ppm/°C (typ); contributes ≤0.75 mV drift over -40°C to +85°C ambient
Min Operating Current	60 µA; supports ultra-low-power wake-up circuits and coin-cell applications
Slope Resistance	0.4 Ω (typ); limits output voltage shift to <1 mV per 2.5 mA load change
Transient Response	Stable in <10 µs; suitable for dynamic supply monitoring in switched-mode power rails
Wideband Noise	45 µV_rms (10 Hz–10 kHz); meets noise floor requirements for 16-bit precision measurement front-ends
Max Transient Current	200 mA (non-destructive); survives ESD-induced surges and hot-swap events

Pinout & Package

SOT23-3 package (suffix F), top view: Pin 1 (anode) floating or tied to Pin 2 (cathode); Pin 2 is cathode (output/reference node); Pin 3 is cathode/anode common terminal. Thermal pad not present; standard JEDEC MO-178 footprint.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode (floating or tied to cathode)	Optional connection point for improved thermal path or layout flexibility; not electrically required
Pin 2	Cathode (reference output)	2.5 V regulated node; connects to load and feedback network; primary voltage sensing point
Pin 3	Cathode/Anode common	Current return path; ties internal junction to external circuit ground or bias rail

Key Features

Feature	Design Value
No external capacitor required	Eliminates BOM cost and board space for stabilization cap; simplifies layout in space-constrained portable designs
Sub-10 µs transient response	Enables real-time supply rail monitoring during fast load transients in battery management systems
0.4 Ω slope resistance	Ensures <1 mV output variation across full 60 µA–15 mA operating range - critical for ratiometric sensor bridges
Industrial temperature range	Guarantees 2.5 V reference stability from -40°C to +85°C without derating - validated for field-deployed test equipment
200 mA surge tolerance	Withstands IEC 61000-4-5 level 3 surges without external protection - reduces system-level TVS count

Applications

Battery-Powered Portable Meters

Precision Data Acquisition Front-Ends

Use Scenario: Handheld multimeters and clamp meters powered by AA/AAA cells with intermittent high-current LCD backlighting.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 2.5 V for ADC reference and analog front-end biasing.

Use Value: 60 µA minimum operating current extends battery life >12 months; 0.5% tolerance eliminates factory calibration steps.

Use Scenario: 16-bit isolated DAQ modules measuring thermocouples and strain gauges in industrial PLC racks.

IC Role / Device Role / Timing Role: Precision reference for sigma-delta ADCs and programmable gain instrumentation amplifiers.

Use Value: 45 µV_rms noise and 30 ppm/°C TC ensure <0.01% total unadjusted error across temperature and time.

Portable Medical Sensors

Low-Power IoT Edge Nodes

Use Scenario: Wearable pulse oximeters using coin-cell batteries and optical analog signal chains.

IC Role / Device Role / Timing Role: Reference source for transimpedance amplifier bias and ADC conversion in optical detection path.

Use Value: Sub-10 µs settling supports synchronized LED pulsing and sampling; 200 mA surge rating handles ESD discharge from human contact.

Use Scenario: Wireless environmental sensors (temp/humidity/pressure) transmitting via BLE every 5 minutes on CR2032.

IC Role / Device Role / Timing Role: Stable reference for MCU-integrated ADC and analog comparator thresholds.

Use Value: 0.4 Ω slope resistance maintains reference accuracy despite wide supply voltage swing (2.0–3.3 V) during RF transmission bursts.

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 adjustable via resistive divider; 2% initial tolerance; 50 ppm/°C TC; requires ≥1 mA min current	Used where programmable reference or higher current drive needed; less suitable for ultra-low-power coin-cell use	Select if design requires adjustable output or higher sink current capability (>15 mA)
REF3025AIDBVR	2.5 V fixed; 0.2% initial tolerance; 50 ppm/°C TC; 50 µA max quiescent; series topology (3-pin)	Preferred for lowest noise (25 µV_rms) and highest accuracy; requires input-to-output headroom	Select if absolute accuracy and noise performance outweigh board space and headroom constraints

Compared with TL431ACDBVR and REF3025AIDBVR, the ZR40402F25TC offers best-in-class micropower operation (60 µA min) and zero-capacitor stability in smallest footprint, trading off absolute accuracy and noise for ultra-low-I_Q and layout simplicity.

Availability

ZR40402F25TC is available at Aetrix Electronics and suitable for battery-powered portable meters, precision data acquisition front-ends, and low-power IoT edge nodes requiring stable component supply with guaranteed long-term availability.

Supply support for ZR40402F25TC 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, with broad portfolio coverage in power management, signal integrity, and precision analog solutions.

The ZR4040 series belongs to Diodes' precision voltage reference product line, engineered specifically for space-constrained, low-power, and high-reliability applications including portable instrumentation and industrial sensing.

FAQ

Is an external capacitor required for stability with the ZR40402F25TC?

No external capacitor is required. The ZR40402F25TC is internally compensated and remains stable with capacitive loads up to 10 nF. This eliminates need for external stabilization components, reducing BOM count and PCB area - confirmed per datasheet Figure 4-174 and Absolute Maximum Ratings table.

What is the maximum safe reverse current during transient events?

The device withstands non-destructive reverse currents up to 200 mA, as specified in Absolute Maximum Ratings. This surge capability allows it to survive IEC 61000-4-5 level 3 transients without external protection, provided average power dissipation stays within 330 mW (SOT23) limits.

Can the ZR40402F25TC be used with a 1.8 V supply rail?

No - it requires sufficient headroom to maintain regulation. With 2.5 V output, minimum supply must exceed 2.5 V plus voltage drop across series resistor. For 1.8 V rails, use a series reference like REF3025 or consider boost-biasing; ZR40402F25TC is strictly a shunt device requiring V_IN > V_REF.

How does the 0.4 Ω slope resistance impact accuracy in varying load conditions?

A 0.4 Ω slope resistance means output voltage shifts by only 0.4 mV per 1 mA change in cathode current. Over its 60 µA–15 mA operating range, this results in ≤6 mV total deviation - well within 0.5% (12.5 mV) initial tolerance, making it suitable for ratiometric and low-drift measurement systems.

ZR40402F25TC Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: TO-236-3, SC-59, SOT-23-3

Series:: -

Packaging:: Tape & Reel (TR)

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:: Surface Mount

Supplier Device Package:: SOT-23-3

ZR40402F25TC FAQ

1.How can I place an order for ZR40402F25TC through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR40402F25TC 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 ZR40402F25TC reliable?

The price and inventory of ZR40402F25TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR40402F25TC is usually 5 days.

3.What payment methods are accepted for ZR40402F25TC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR40402F25TC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR40402F25TC?

ZR40402F25TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR40402F25TC 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 ZR40402F25TC?

For technical support, including ZR40402F25TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR40402F25TC requirements.

6.How does Aetrix verify that ZR40402F25TC is sourced from the original manufacturer or authorized distributors?

All ZR40402F25TC 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 ZR40402F25TC meets industry standards.

7.What is the process for return or replacement of ZR40402F25TC?

All ZR40402F25TC units undergo pre-shipment inspection (PSI). If there is an issue with ZR40402F25TC, 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 ZR40402F25TC part is unused and in its original packaging.

Return procedure for ZR40402F25TC:

1.Submit a request within 90 days.

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

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