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 ZXRE125FRSTOA

Name: ZXRE125FRSTOA
Brand: Diodes Incorporated
SKU: ZXRE125FRSTOA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: ZXRE125FRSTOA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: E-Line-3

Datasheet:: ZXRE125FRSTOA.pdf

Description:: IC VREF SHUNT 3% E-LINE

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:3,964

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

Product details

Overview

ZXRE125FRSTOA from Zetex Semiconductors is a micropower bandgap voltage reference delivering a precise 1.220 V output with ±3% initial tolerance, 20 ppm/°C typical temperature coefficient, and stable operation from 8 µA to 20 mA supply current. It is housed in an E-line (TO-92 compatible) package and targets low-power, space-constrained systems such as portable instrumentation and battery-powered data acquisition.

For engineers reviewing the ZXRE125FRSTOA datasheet, ZXRE125FRSTOA pinout, ZXRE125FRSTOA application, or ZXRE125FRSTOA equivalent, key selection criteria include its 3% tolerance grade, unconditionally stable performance with capacitive loads, 4 µA knee current, and compatibility with legacy ZRA124/ZRA125 references in E-line form factor.

Technical Context

The ZXRE125FRSTOA implements a two-terminal bandgap reference topology optimized for ultra-low quiescent current and load insensitivity. Its internal circuitry achieves thermal stability via curvature-compensated bandgap core and maintains regulation down to 4 µA minimum operating current.

Unlike shunt references requiring external resistors, it operates as a two-terminal device with reverse-biased configuration-pin 1 and pin 2 are functionally interchangeable (both anode/cathode configurable), and pin 3 is internally floating or tied to pin 1 per E-line mechanical layout. Absolute max reverse current is 30 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.220 V nominal; ±3% initial tolerance ensures predictable biasing in precision ADC references and sensor excitation circuits.
Tempco	20 ppm/°C typical; enables <±2.5 mV drift over −40°C to +85°C ambient, critical for portable equipment calibration stability.
Knee Current	4 µA minimum; allows reliable startup and regulation in energy-harvesting or coin-cell–powered systems with ultra-low standby current.
Operating Current Range	8 µA to 20 mA; supports wide dynamic range from microamp-level sensing front-ends to higher-current analog signal chains.
Dynamic Impedance	0.2 Ω typical at 1 mA; ensures minimal output perturbation under fast transient load changes in mixed-signal SoCs.
Noise (10 Hz–10 kHz)	60 µV_rms; low enough for 12-bit+ data acquisition without additional filtering in portable measurement tools.

Pinout & Package

E-line (TO-92 style) three-terminal package with axial lead configuration; pin 1 and pin 2 are electrically identical (anode/cathode configurable), pin 3 is internally floating or connected to pin 1 per mechanical drawing.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode or Cathode	Interchangeable terminal; configured as cathode when used in standard shunt reference mode with external resistor to V_CC.
Pin 2	Anode or Cathode	Electrically identical to Pin 1; enables flexible PCB layout and dual-side mounting in constrained enclosures.
Pin 3	Internal Tie / NC	Floating or internally bonded to Pin 1; no external connection required-simplifies routing and eliminates stub effects.

Key Features

Feature	Design Value
Unconditional Stability	Maintains regulation with any capacitive load up to 10 µF-eliminates need for external compensation in battery-monitoring circuits.
Low Knee Current	4 µA start-up threshold enables use in wake-on-event systems where supply current must remain sub-µA until activation.
Wide Operating Current Range	8 µA–20 mA span supports both ultra-low-power sleep modes and active high-accuracy conversion phases in single-supply designs.
Thermal Performance	20 ppm/°C tempco and −40°C to +85°C operational range ensure consistent reference accuracy across industrial handheld environments.

Applications

Battery Voltage Monitoring

Precision Sensor Excitation

Use Scenario: Monitoring Li-ion cell voltage during charge/discharge cycles in portable medical devices.

IC Role / Device Role / Timing Role: Two-terminal shunt reference providing stable 1.22 V reference for ADC input scaling and comparator thresholds.

Use Value: Enables accurate state-of-charge estimation within ±1% error over full temperature range and battery life.

Use Scenario: Supplying excitation voltage to bridge-based pressure sensors in handheld diagnostic tools.

IC Role / Device Role / Timing Role: Low-drift, low-noise reference source for ratiometric sensor signal conditioning.

Use Value: Reduces offset drift contribution to <0.05% FS, improving repeatability in field-deployed instruments.

Portable Data Loggers

Low-Power RTD Interfaces

Use Scenario: Providing reference for successive-approximation ADCs sampling environmental parameters over multi-day deployments.

IC Role / Device Role / Timing Role: Micropower voltage reference enabling extended battery life while maintaining 12-bit effective resolution.

Use Value: Extends coin-cell lifetime beyond 3 years by limiting reference current to <10 µA during sampling intervals.

Use Scenario: Biasing 3-wire RTD bridges in wearable health monitors with tight thermal constraints.

IC Role / Device Role / Timing Role: Stable excitation source minimizing self-heating and common-mode error in delta-sigma ADC front-ends.

Use Value: Limits RTD measurement error to <0.1°C over −10°C to +50°C ambient without active thermal management.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
ZXRE125DRSTOA	±1% initial tolerance, same E-line package and pinout	Better accuracy for mid-tier portable test equipment requiring tighter ADC linearity	Select when system calibration budget allows tighter initial error but retains same thermal and current specs.
ZXRE125ERSTOA	±2% tolerance, identical tempco and knee current	Cost-optimized alternative for consumer-grade wearables where 2% reference error is acceptable	Choose for BOM cost reduction where 1.22 V ±2% meets end-product specification limits.

Compared with ZXRE125FRSTOA, the DRSTOA offers higher accuracy at same power and thermal behavior, while the ERSTOA trades 1% tolerance for lower unit cost-enabling tiered product variants without redesigning PCB layout or firmware.

Availability

ZXRE125FRSTOA is available at Aetrix Electronics and suitable for battery-powered equipment, portable instrumentation, and data acquisition systems requiring stable component supply with long-term manufacturability and consistent parametric performance.

Supply support for ZXRE125FRSTOA 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

Zetex Semiconductors (now part of Diodes Incorporated) specialized in high-performance analog and discrete semiconductors, emphasizing precision, low power, and robustness for portable and industrial applications.

The ZXRE125 series belongs to Zetex's micropower voltage reference product line, engineered specifically for ultra-low-current, high-stability reference needs in space- and energy-constrained systems.

FAQ

What is the maximum reverse current rating for ZXRE125FRSTOA?

The absolute maximum reverse current is 30 mA, as specified in the Absolute Maximum Ratings table. Exceeding this value risks permanent degradation of the bandgap core. Operation above 20 mA is not recommended for continuous use due to thermal dissipation limits of the E-line package (500 mW at 25°C ambient).

Can ZXRE125FRSTOA be used in series with other references to generate higher voltages?

No-ZXRE125FRSTOA is a two-terminal shunt reference designed for parallel (not series) connection with a current-setting resistor. Cascading multiple units violates its reverse-bias operating mode and will cause unpredictable regulation or failure. For higher reference voltages, use dedicated series references or resistor-divider networks with buffered outputs.

Is pin 3 of the E-line package required to be connected externally?

No-pin 3 is internally floating or bonded to pin 1 per the mechanical drawing and does not require external connection. Leaving it unconnected has no electrical impact; connecting it to pin 1 adds no functional benefit and may introduce parasitic inductance in high-frequency layouts.

How does the 4 µA knee current affect circuit design?

The 4 µA knee current defines the minimum current needed to initiate stable regulation. Designers must ensure the external current-setting resistor delivers ≥4 µA across the full input voltage range and temperature extremes. Below this, output voltage collapses unpredictably-critical for wake-up circuits relying on guaranteed reference turn-on.

ZXRE125FRSTOA 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):: 1.22V

Voltage - Output (Max):: -

Current - Output:: 20 mA

Tolerance:: ±3%

Temperature Coefficient:: 75ppm/°C

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: 60µVrms

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 8 µA

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

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: E-Line (TO-92 compatible)

ZXRE125FRSTOA FAQ

1.How can I place an order for ZXRE125FRSTOA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXRE125FRSTOA 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 ZXRE125FRSTOA reliable?

The price and inventory of ZXRE125FRSTOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125FRSTOA is usually 5 days.

3.What payment methods are accepted for ZXRE125FRSTOA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125FRSTOA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXRE125FRSTOA?

ZXRE125FRSTOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXRE125FRSTOA 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 ZXRE125FRSTOA?

For technical support, including ZXRE125FRSTOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125FRSTOA requirements.

6.How does Aetrix verify that ZXRE125FRSTOA is sourced from the original manufacturer or authorized distributors?

All ZXRE125FRSTOA 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 ZXRE125FRSTOA meets industry standards.

7.What is the process for return or replacement of ZXRE125FRSTOA?

All ZXRE125FRSTOA units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125FRSTOA, 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 ZXRE125FRSTOA part is unused and in its original packaging.

Return procedure for ZXRE125FRSTOA:

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…