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

Diodes Incorporated ZR40402R50STOB

Name: ZR40402R50STOB
Brand: Diodes Incorporated
SKU: ZR40402R50STOB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZR40402R50STOB

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: E-Line-3

Datasheet:: ZR40402R50STOB.pdf

Description:: IC VREF SHUNT 2% E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:4,663

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Product details

Overview

ZR40402R50STOB from Diodes Incorporated is a precision 5.0 V micropower shunt voltage reference using bandgap circuitry, operating stably from 60 µA to 15 mA with no external capacitor required. It delivers 2% initial tolerance, 20 ppm/°C typical temperature coefficient, 0.33 Ω typical slope resistance, and sub-10 µs transient response-ideal for battery-powered instrumentation and portable data acquisition systems.

For engineers reviewing the ZR40402R50STOB datasheet, ZR40402R50STOB pinout, ZR40402R50STOB application, or ZR40402R50STOB equivalent, key selection criteria include low-quiescent-current operation, capacitive-load stability, automotive-grade temperature range (–55°C to +125°C), and E-Line (TO-92 reversed) package compatibility in space-constrained analog signal chains.

Technical Context

The ZR40402R50STOB functions 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-based core ensures stable output without external compensation, and it remains functional up to 25 mA absolute maximum reverse current while surviving transient surges to 200 mA.

Designed for direct replacement of legacy references like TL431 in low-power configurations, it exhibits 105 µV_RMS wideband noise (10 Hz–10 kHz) and maintains regulation under varying load currents due to low dynamic impedance (0.4 Ω typical at 1 mA, 100 Hz).

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	5.00 V ±2% at 150 µA - tight initial accuracy enables single-point calibration in precision ADC references.
Temp. Coefficient	20 ppm/°C typical (–40°C to +85°C) - supports <±0.5 mV drift over industrial temperature span.
Slope Resistance	0.33 Ω typical - minimizes output voltage shift under load current variation (e.g., ±0.33 mV per 1 mA change).
Operating Current	60 µA to 15 mA - enables use in ultra-low-power sleep modes and higher-drive analog front-ends.
Transient Response	Stable in <10 µs - allows fast wake-up from power-down in portable metering without settling delay.
Noise (10 Hz–10 kHz)	105 µV_RMS - suitable for 16-bit SAR ADC biasing where reference noise dominates system ENOB.

Pinout & Package

E-Line (3-pin TO-92 reversed) package: compact through-hole form factor with pin 3 floating or connected to pin 1 per datasheet diagram 4-184; compatible with standard TO-92 footprint but with reversed terminal assignment versus conventional TO-92.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Current sink return path	Connected to system ground; sets reference node potential when used with series resistor.
Cathode (Pin 2)	Output reference node	Provides regulated 5.0 V output; connects to load and feedback networks.
Pin 3	Floating or tied to Pin 1	No internal connection; may be grounded for mechanical stability or left unconnected per layout guidelines.

Key Features

Feature	Design Value
No external capacitor required	Enables minimal BOM count and PCB area savings in space-limited portable designs.
Stable with capacitive loads	Supports direct connection to ADC input caps or LDO bypass networks without oscillation risk.
Automotive temperature range	Validated operation from –55°C to +125°C meets AEC-Q100 stress requirements for under-hood sensing.
Sub-10 µs settling time	Permits rapid reference enable/disable cycling in duty-cycled measurement systems.
200 mA surge withstand	Survives ESD and inrush transients without degradation in industrial field equipment.

Applications

Battery-Powered Multimeters

Precision RTD Signal Conditioning

Use Scenario: Handheld digital multimeter requiring stable 5 V reference for 200 kSPS dual-slope ADC during 100-hour battery life.

IC Role / Device Role / Timing Role: Shunt voltage reference establishing ADC full-scale input range and offset null point.

Use Value: 60 µA minimum operating current extends battery life; 20 ppm/°C TC ensures <±0.1% reading error across –10°C to +50°C ambient.

Use Scenario: 4-wire RTD bridge amplifier in process transmitter with 4–20 mA loop power constraint.

IC Role / Device Role / Timing Role: Precision excitation reference for constant-current source driving platinum RTD element.

Use Value: 0.33 Ω slope resistance limits gain error to <0.01% over 0–15 mA load current swing.

Portable Gas Analyzers

Industrial Data Loggers

Use Scenario: Electrochemical sensor interface in handheld gas detector powered by coin-cell battery.

IC Role / Device Role / Timing Role: Bias reference for transimpedance amplifier converting nanoamp-level sensor current to voltage.

Use Value: 105 µV_RMS noise contributes <0.005% of full-scale error in 16-bit digitization of 100 nA–10 µA signals.

Use Scenario: Remote environmental monitor logging temperature/humidity every 5 minutes using Li-SOCl₂ primary cell.

IC Role / Device Role / Timing Role: Reference for microcontroller's internal ADC during periodic wake-up sampling bursts.

Use Value: Sub-10 µs settling enables full ADC conversion within 20 µs wake-up window, minimizing active time and extending 10-year battery life.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TL431ACDR	2.495 V nominal, adjustable via resistive divider; requires external components for 5 V setup; 0.2 Ω typical output impedance.	Used where programmability or tighter 0.5% tolerance is needed; less suited for ultra-low-I_Q battery operation.	Select if system already uses TL431-based feedback topology and 5 V is derived via resistor network.
REF43 5.0	5.0 V fixed, 10 ppm/°C max TC, 3.5 µA quiescent current, but requires 100 nF capacitor for stability.	Preferred in high-precision lab equipment where ultra-low drift outweighs board space penalty of added capacitor.	Choose when TC specification dominates over size/power constraints, and capacitor placement is feasible.

Compared with TL431ACDR and REF43 5.0, ZR40402R50STOB uniquely balances 2% tolerance, 60 µA minimum current, capacitor-free operation, and TO-92 reversed footprint-making it optimal for cost-sensitive, space-constrained, battery-operated field instruments where moderate precision suffices.

Availability

ZR40402R50STOB is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable test equipment, and industrial data loggers requiring stable component supply with long-term manufacturability and consistent parametric performance.

Supply support for ZR40402R50STOB 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.

The ZR4040 series belongs to Diodes' precision voltage reference product line, engineered specifically for low-power, high-stability analog subsystems in portable, automotive, and industrial environments.

FAQ

What is the maximum reverse current ZR40402R50STOB can safely handle?

The device is rated for 25 mA continuous reverse current per absolute maximum ratings, but its rugged 20 V process allows survival of transient surges up to 200 mA. Sustained operation above 15 mA increases self-heating and may degrade long-term stability; design margin should keep average current ≤15 mA.

Can ZR40402R50STOB be used without an external series resistor?

No-it is a shunt reference and must be used with an external current-setting resistor between supply and cathode. The resistor value is calculated as (V_SUPPLY − 5.0 V) / I_OP, where I_OP is selected between 60 µA and 15 mA based on load and stability requirements.

Is the E-Line package of ZR40402R50STOB pin-compatible with standard TO-92?

No-the E-Line package uses a reversed pinout: Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = floating/tied-to-Pin1, whereas standard TO-92 has Pin 1 = Emitter, Pin 2 = Base, Pin 3 = Collector. Mechanical footprint matches TO-92, but electrical connections differ; PCB layout must follow ZR4040-5.0 connection diagram 4-184.

Does ZR40402R50STOB require derating at elevated temperatures?

Yes-power dissipation must be derated above 25°C ambient. For the E-Line package (500 mW at 25°C), thermal resistance θ_JA is ~200°C/W, so maximum allowable power drops to ~375 mW at 75°C ambient. Ensure junction temperature stays below 125°C using worst-case current and ambient conditions.

ZR40402R50STOB 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:: ±2%

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)

ZR40402R50STOB FAQ

1.How can I place an order for ZR40402R50STOB through Aetrix?

Please submit a Request for Quotation (RFQ) for ZR40402R50STOB 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 ZR40402R50STOB reliable?

The price and inventory of ZR40402R50STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR40402R50STOB is usually 5 days.

3.What payment methods are accepted for ZR40402R50STOB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR40402R50STOB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZR40402R50STOB?

ZR40402R50STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZR40402R50STOB 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 ZR40402R50STOB?

For technical support, including ZR40402R50STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR40402R50STOB requirements.

6.How does Aetrix verify that ZR40402R50STOB is sourced from the original manufacturer or authorized distributors?

All ZR40402R50STOB 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 ZR40402R50STOB meets industry standards.

7.What is the process for return or replacement of ZR40402R50STOB?

All ZR40402R50STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZR40402R50STOB, 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 ZR40402R50STOB part is unused and in its original packaging.

Return procedure for ZR40402R50STOB:

1.Submit a request within 90 days.

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

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