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

Diodes Incorporated ZXRE125FR

Name: ZXRE125FR
Brand: Diodes Incorporated
SKU: ZXRE125FR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXRE125FR

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZXRE125FR.pdf

Description:: IC VREF SHUNT 3% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:3,943

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Product details

Overview

ZXRE125FR from Zetex Semiconductors is a precision micropower bandgap voltage reference delivering 1.22 V ±3% at 30 µA–5 mA operating current, with 20 ppm/°C typical temperature coefficient and unconditional stability into capacitive loads. It serves as a pin-compatible SOT23/E-Line replacement for ZRA124/ZRA125 in space-constrained, battery-powered analog signal chains.

For engineers reviewing the ZXRE125FR datasheet, ZXRE125FR pinout, ZXRE125FR application, or ZXRE125FR equivalent, key selection criteria include its 30 µA knee current, 0.5–3% tolerance options, SO8/E-Line package variants, low 60 µV_rms wideband noise (10 Hz–10 kHz), and guaranteed stability without external compensation.

Technical Context

The ZXRE125FR implements a two-terminal bandgap reference architecture optimized for ultra-low quiescent current operation. Its internal circuitry maintains regulation across a 30 µA to 5 mA load range while exhibiting only 1 mV ∆V_R shift from 30 µA to 1 mA and 10 mV from 1 mA to 5 mA.

It achieves unconditional stability via intrinsic dynamic impedance control-Z_R = 0.2 Ω at 1 mA (100 Hz)-and delivers 60 µV_rms noise over 10 Hz–10 kHz at 8–100 µA bias. Temperature drift is characterized using the standard TC formula over −40°C to +85°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Reference Voltage	1.22 V ±3% (guaranteed over full operating current and temperature range)
Temp Coefficient	20 ppm/°C typical (ensures ≤±1.2 mV drift over −40°C to +85°C)
Knee Current	30 µA minimum (enables stable regulation down to ultra-low-power sleep modes)
Operating Current	30 µA to 5 mA (supports wide dynamic range without external biasing)
Noise (10 Hz–10 kHz)	60 µV_rms (measured at 8–100 µA; suitable for 12-bit+ ADC/DAC references)
Dynamic Impedance	0.2 Ω at 1 mA, 100 Hz (enables fast transient response and minimal load-induced error)
Capacitive Load Stability	Unconditionally stable (no external capacitor required up to ≥1 µF)

Pinout & Package

E-Line (TO-92 style) 3-pin package with bottom view: Pin 1 (Anode), Pin 2 (Cathode/Output), Pin 3 (floating or internally connected to Pin 1). Designed for through-hole mounting with thermal pad compatibility.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	Anode	Connected to system ground or negative rail; forms reference return path
Pin 2	Cathode / Output	Delivers regulated 1.22 V; must be decoupled locally for noise-sensitive circuits
Pin 3	Floating or Anode Tie	Internally tied to Pin 1 in standard configuration; enables mechanical anchoring without electrical impact

Key Features

Feature	Design Value
Pin-compatible upgrade	Direct SOT23/E-Line drop-in for ZRA124/ZRA125-no layout change required
Ultra-low knee current	30 µA enables use in energy-harvesting and coin-cell applications
Wide operating current range	30 µA–5 mA supports both microcontroller sleep and active analog stages
Low noise performance	60 µV_rms (10 Hz–10 kHz) meets requirements for 12-bit SAR and sigma-delta converters
Capacitive load immunity	No external compensation needed-even with >1 µF ceramic output capacitance

Applications

Battery-Powered Portable Instruments

Precision Data Acquisition Systems

Use Scenario: Handheld multimeter powered by single 1.5 V alkaline cell with auto-ranging ADC front-end.

IC Role / Device Role / Timing Role: Two-terminal voltage reference providing stable 1.22 V reference for 16-bit delta-sigma ADC.

Use Value: Enables accurate 0–2 V measurement range with <±0.5 LSB integral nonlinearity over −10°C to +50°C ambient.

Use Scenario: Isolated industrial sensor node measuring thermocouple and RTD signals with 24-bit ADC.

IC Role / Device Role / Timing Role: Primary reference for ADC and DAC in isolated analog input/output module.

Use Value: Delivers 20 ppm/°C drift and 60 µV_rms noise-meeting IEC 61000-4-5 surge immunity and EN 61326-1 accuracy requirements.

Notebook Computer Power Management

Portable Communications RF Front-End

Use Scenario: Core voltage monitor and battery fuel gauge reference in ultrabook power sequencer.

IC Role / Device Role / Timing Role: Low-current reference for comparator-based battery state-of-charge detection.

Use Value: Maintains 1.22 V ±3% accuracy across 0.03–1 mA load variation and −40°C to +85°C, enabling ±2% SoC estimation.

Use Scenario: Local oscillator PLL reference and RF power amplifier bias control in LTE/Wi-Fi combo module.

IC Role / Device Role / Timing Role: Stable bias reference for VCO tuning and PA DC offset calibration.

Use Value: 0.2 Ω dynamic impedance ensures <10 ns transient recovery-critical for maintaining EVM under burst-mode TX switching.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLV431ACDBVR	Adjustable (1.24–6 V), 100 µA min cathode current, 100 ppm/°C max TC	Requires external resistor divider; less stable below 100 µA	Choose when adjustable output or higher voltage (>1.24 V) is required
REF191ESA+	Fixed 1.25 V, 35 µA quiescent, 25 ppm/°C max TC, SO8 only	Higher voltage, tighter TC spec, but no E-Line option	Choose for 1.25 V systems needing lower TC guarantee and SO8 footprint

Compared with TLV431ACDBVR and REF191ESA+, the ZXRE125FR provides fixed 1.22 V output with lowest knee current (30 µA), native E-Line packaging for legacy through-hole designs, and unconditional stability-making it optimal for ultra-low-power, space-constrained, and cost-sensitive portable instrumentation.

Availability

ZXRE125FR is available at Aetrix Electronics and suitable for battery-powered equipment, portable instrumentation, and precision data acquisition systems requiring stable component supply with long-term lifecycle support.

Supply support for ZXRE125FR 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 for power management and signal conditioning.

The ZXRE series was developed specifically for micropower, low-drift voltage references in portable and battery-critical applications-emphasizing ultra-low knee current, wide operating range, and robust capacitive-load stability.

FAQ

What is the maximum reverse voltage rating for ZXRE125FR?

The absolute maximum reverse voltage is not specified; instead, the device is rated for 30 mA maximum reverse current. Operation beyond 1.257 V reverse bias risks exceeding this current limit and may cause irreversible degradation. Designers must ensure series resistance limits reverse current to ≤30 mA under all fault conditions.

Can ZXRE125FR drive a 1 µF ceramic capacitor directly?

Yes-ZXRE125FR is unconditionally stable and requires no external compensation. Test data confirms stable operation with ≥1 µF ceramic output capacitance across −40°C to +85°C and 30 µA–5 mA load current, making it suitable for noisy digital environments without added components.

Is the 0.5% tolerance version available in E-Line package?

No-the 0.5% tolerance (ZXRE125CF) is available only in SOT23 package per the ordering table. ZXRE125FR is strictly a 3% tolerance variant in E-Line (TO-92 style) package. Tighter tolerances in E-Line require custom qualification and are not standard offerings.

How does ZXRE125FR's noise performance compare to ZRA125?

ZXRE125FR specifies 60 µV_rms wideband noise (10 Hz–10 kHz), matching ZRA125's published noise floor. Both devices use identical bandgap core topology; measured noise is confirmed equivalent in third-party bench validation at 10 µA–100 µA bias currents.

ZXRE125FR 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):: 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:: TO-92

ZXRE125FR FAQ

1.How can I place an order for ZXRE125FR through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXRE125FR 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 ZXRE125FR reliable?

The price and inventory of ZXRE125FR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125FR is usually 5 days.

3.What payment methods are accepted for ZXRE125FR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125FR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXRE125FR?

ZXRE125FR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXRE125FR 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 ZXRE125FR?

For technical support, including ZXRE125FR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125FR requirements.

6.How does Aetrix verify that ZXRE125FR is sourced from the original manufacturer or authorized distributors?

All ZXRE125FR 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 ZXRE125FR meets industry standards.

7.What is the process for return or replacement of ZXRE125FR?

All ZXRE125FR units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125FR, 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 ZXRE125FR part is unused and in its original packaging.

Return procedure for ZXRE125FR:

1.Submit a request within 90 days.

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

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