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

Diodes Incorporated ZXRE125ER

Name: ZXRE125ER
Brand: Diodes Incorporated
SKU: ZXRE125ER
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXRE125ER

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

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

Datasheet:: ZXRE125ER.pdf

Description:: IC VREF SHUNT 2% TO92

Quantity:: RFQ Add To RFQ list

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Inventory:3,813

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Product details

Overview

ZXRE125ER from Diodes Incorporated is a micropower bandgap voltage reference IC delivering a precise 1.220 V output with ±0.5% initial tolerance, 20 ppm/°C typical temperature coefficient, and stable operation from 4 µA to 20 mA supply current - used in battery-powered instrumentation for accurate ADC biasing and sensor excitation.

For engineers reviewing the ZXRE125ER datasheet, ZXRE125ER pinout, ZXRE125ER application, or ZXRE125ER equivalent, key selection criteria include low knee current (4 µA), unconditional stability with capacitive loads, SOT23-3 package compatibility, and tolerance-grade availability (C/D/E/F) for precision analog signal chains.

Technical Context

The ZXRE125ER implements a two-terminal shunt topology with reverse-biased Zener-like bandgap core, operating as a precision voltage sink referenced to ground. It requires no external components for basic operation and maintains regulation across 8 µA–20 mA load current range.

Its thermal design achieves 20 ppm/°C typical TC over –40°C to +85°C, and its dynamic impedance remains ≤0.6 Ω at 1 mA, enabling low-noise performance (60 µV_rms, 10 Hz–10 kHz) in high-resolution data acquisition front-ends.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.220 V ±0.5% at 100 µA - defines absolute accuracy of analog measurement references
Temp Coefficient	20 ppm/°C typical - ensures <±1.2 mV drift over full industrial temperature range
Knee Current	4 µA - enables ultra-low-power wake-up and standby biasing in energy-harvesting systems
Dynamic Impedance	0.2–0.6 Ω at 1 mA - minimizes load-induced voltage error in precision current-sense circuits
Noise (10 Hz–10 kHz)	60 µV_rms - supports 16-bit+ resolution without additional filtering in portable DAQ
Capacitive Load Stability	Unconditionally stable - eliminates need for series resistance or compensation networks
Operating Current Range	4 µA to 20 mA - accommodates both microamp sleep modes and milliamp active sensing

Pinout & Package

SOT23-3 surface-mount package (3.04 mm × 2.64 mm × 1.12 mm), JEDEC MO-178AA compliant, with gull-wing leads and green molding compound (Br/Sb-free).

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Reference Output / Cathode Connection Point	Connected to system ground when used in standard shunt configuration; floating or tied to Pin 2 per layout flexibility
Pin 2 (Cathode)	Input / Bias Terminal	Receives input current; voltage develops across external resistor to set operating point and output regulation
Pin 3 (NC)	No Connect	Internally unconnected; must remain floating or grounded per PCB layout guidelines to avoid parasitic coupling

Key Features

Feature	Design Value
Shunt topology with 4 µA knee current	Enables direct integration into low-quiescent-current battery monitors without startup sequencing
0.5% initial tolerance (ZXRE125CFTA variant)	Eliminates post-calibration in factory-trimmed portable medical sensors
20 ppm/°C tempco over –40°C to +85°C	Meets Class A accuracy requirements for handheld multimeters and calibration sources
Unconditional stability with capacitive loads	Permits direct connection to ADC reference inputs without isolation resistors or ferrites
SOT23-3 footprint compatibility with ZRA124/ZRA125	Supports drop-in replacement in legacy designs without board rework

Applications

Battery-Powered Instrumentation

Precision Data Acquisition

Use Scenario: Handheld digital multimeter requiring stable 1.22 V reference for 16-bit SAR ADC scaling.

IC Role / Device Role / Timing Role: Shunt voltage reference providing ratiometric excitation for internal voltage divider and ADC reference rail.

Use Value: 20 ppm/°C tempco ensures <±2 LSB error across operating temperature without software correction.

Use Scenario: Portable environmental sensor node measuring thermistor and RTD bridges.

IC Role / Device Role / Timing Role: Precision bias source for bridge excitation and ADC VREF input in low-power microcontroller subsystem.

Use Value: 4 µA knee current allows continuous monitoring during deep-sleep cycles with sub-µA system quiescent draw.

Portable Communication Devices

Low-Power Sensor Signal Conditioning

Use Scenario: Bluetooth LE audio accessory with integrated microphone preamp and ADC.

IC Role / Device Role / Timing Role: Reference for programmable gain amplifier (PGA) offset nulling and ADC full-scale calibration.

Use Value: 60 µV_rms broadband noise prevents degradation of SNR in 24-bit audio digitization path.

Use Scenario: Wearable heart rate monitor using photodiode current-to-voltage conversion.

IC Role / Device Role / Timing Role: Stable bias for transimpedance amplifier feedback network and reference for correlated double sampling.

Use Value: Unconditional stability with 10 nF decoupling capacitor ensures immunity to layout-induced oscillation in compact flex PCBs.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431AIDBZR	Adjustable output (2.5 V min), 100 ppm/°C max TC, 80 µA typical I_KA	Requires external resistor divider; higher power consumption limits use in sub-10 µA systems	Select when adjustable reference or higher output voltage is required; not suitable for fixed 1.22 V ultra-low-I_Q designs
MAX6008AEUR+T	1.25 V nominal, 30 ppm/°C max TC, 1.5 µA max I_Q, SC70-3 package	Lower quiescent current but tighter voltage tolerance not available at 1.22 V; different pinout	Prefer for lowest possible I_Q where 1.25 V output is acceptable and SC70-3 layout is feasible

Compared with TLVH431AIDBZR and MAX6008AEUR+T, the ZXRE125ER uniquely delivers 1.22 V ±0.5% at 4 µA knee current in SOT23-3, making it optimal for space-constrained, fixed-voltage, micropower analog signal chains where output voltage and package compatibility are non-negotiable.

Availability

ZXRE125ER is available at Aetrix Electronics and suitable for battery-powered instrumentation, precision data acquisition systems, and portable communication devices requiring stable component supply with long-term lifecycle support.

Supply support for ZXRE125ER 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability, cost-optimized components for industrial, computing, and consumer markets.

The ZXRE125ER belongs to Diodes' precision voltage reference product line, engineered specifically for micropower, fixed-output shunt references in space- and energy-constrained portable electronics.

FAQ

What is the minimum operating current for reliable regulation of ZXRE125ER?

The ZXRE125ER achieves stable regulation starting at 4 µA (knee current), verified per DS32170 Rev. 8–2 electrical characteristics table. Below this, output voltage drops nonlinearly; operation at 8 µA or higher is recommended for guaranteed 0.5% tolerance across temperature.

Can ZXRE125ER drive a 1000 pF capacitive load without oscillation?

Yes - the device is unconditionally stable per datasheet, meaning it maintains phase margin >45° with any capacitive load up to at least 10 nF, including 1000 pF. No series resistor or isolation is required, simplifying PCB layout in noise-sensitive ADC reference paths.

Is ZXRE125ER pin-compatible with ZRA125 series devices?

Yes - ZXRE125ER is explicitly designed as a pin-for-pin replacement for ZRA124 and ZRA125 series in SOT23-3 packages. Pin 1 (anode), Pin 2 (cathode), and Pin 3 (NC) match exactly, and electrical specifications meet or exceed legacy ZRA performance in all key parameters.

Does ZXRE125ER require an external resistor for basic operation?

Yes - as a two-terminal shunt reference, ZXRE125ER requires an external current-setting resistor between supply and Pin 2 (cathode). The resistor value is calculated as R = (V_SUPPLY − 1.22 V) / I_OPERATING, where I_OPERATING must be ≥4 µA and ≤20 mA for specified performance.

ZXRE125ER 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:: ±2%

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

ZXRE125ER FAQ

1.How can I place an order for ZXRE125ER through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXRE125ER 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 ZXRE125ER reliable?

The price and inventory of ZXRE125ER are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125ER is usually 5 days.

3.What payment methods are accepted for ZXRE125ER?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125ER transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXRE125ER?

ZXRE125ER orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXRE125ER 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 ZXRE125ER?

For technical support, including ZXRE125ER datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125ER requirements.

6.How does Aetrix verify that ZXRE125ER is sourced from the original manufacturer or authorized distributors?

All ZXRE125ER 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 ZXRE125ER meets industry standards.

7.What is the process for return or replacement of ZXRE125ER?

All ZXRE125ER units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125ER, 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 ZXRE125ER part is unused and in its original packaging.

Return procedure for ZXRE125ER:

1.Submit a request within 90 days.

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

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