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

Diodes Incorporated ZXRE125DRSTOA

Name: ZXRE125DRSTOA
Brand: Diodes Incorporated
SKU: ZXRE125DRSTOA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXRE125DRSTOA

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: E-Line-3

Datasheet:: ZXRE125DRSTOA.pdf

Description:: IC VREF SHUNT 1% E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:1,266

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Product details

Overview

ZXRE125DRSTOA from Diodes Incorporated is a micropower bandgap voltage reference IC delivering a precise 1.220 V output with ±1% initial tolerance, 20 ppm/°C typical temperature coefficient, and stable operation from 4 µA to 20 mA supply current - used in precision analog signal chains of portable instrumentation and battery-powered data acquisition systems.

For engineers reviewing the ZXRE125DRSTOA datasheet, ZXRE125DRSTOA pinout, ZXRE125DRSTOA application, or ZXRE125DRSTOA equivalent, key selection criteria include knee current (4 µA), dynamic impedance (0.2–0.6 Ω), wideband noise (60 µV_rms), capacitive load stability, and SOT23-3 package compatibility with ZRA124/ZRA125 replacements.

Technical Context

The ZXRE125DRSTOA implements a two-terminal bandgap reference topology optimized for ultra-low quiescent current and unconditional stability with capacitive loads up to several µF. Its internal architecture eliminates need for external compensation while maintaining 1.220 V accuracy across –40°C to +85°C.

It operates as a shunt-mode reference: anode connects to ground, cathode to regulated node via series resistor; voltage regulation occurs by sinking variable current to hold cathode at 1.220 V. Minimum operating current is 4 µA; recommended range spans 8 µA to 20 mA.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.220 V ±1% (tight tolerance enables direct replacement in 1.2 V precision ADC/DAC biasing)
Tempco	20 ppm/°C typical (ensures ≤1.2 mV drift over –40°C to +85°C for portable equipment)
Knee Current	4 µA (enables operation in ultra-low-power wake-up circuits and energy-harvesting sensors)
Dynamic Impedance	0.2–0.6 Ω at 1 mA (minimizes load-induced voltage error in high-precision ratiometric measurements)
Noise (10 Hz–10 kHz)	60 µV_rms (supports 16-bit+ resolution in low-noise data acquisition front-ends)
Capacitive Load Stability	Unconditionally stable (allows direct connection to large bypass caps without oscillation in space-constrained PCBs)

Pinout & Package

Package: SOT23-3 (JEDEC TO-236AB), 2.80 × 2.64 × 1.12 mm body, gull-wing leads, green molding compound (Br/Sb-free).

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Ground reference terminal	Must be connected to system ground; defines 0 V reference for cathode voltage
Cathode (Pin 2)	Regulated output node	Provides stable 1.220 V when biased with external resistor; sinks variable current
No-Connect (Pin 3)	Unused terminal	Internally unconnected; left floating or tied to Pin 1 per layout best practice

Key Features

Feature	Design Value
Shunt-mode operation	Enables flexible biasing in both high-side and low-side configurations without dedicated supply rail
4 µA knee current	Supports operation in sub-10 µA power domains such as RTC backup and sensor sleep modes
0.2 Ω dynamic impedance	Reduces output voltage shift under varying load currents in precision current-sense amplifiers
Unconditional stability	Eliminates need for external compensation networks in compact PCB layouts with decoupling caps
Green package (Br/Sb-free)	Meets RoHS 2011/65/EU and JEDEC J-STD-609A Class 1 moisture sensitivity requirements

Applications

Battery-Powered Sensors

Precision ADC Reference

Use Scenario: Low-power environmental sensor node powered by coin cell, sampling temperature/humidity every 5 minutes.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.220 V reference for 16-bit sigma-delta ADC.

Use Value: 4 µA knee current extends battery life beyond 5 years; 20 ppm/°C tempco ensures <±2 LSB error across operating temperature.

Use Scenario: Portable multimeter with auto-ranging 24-bit ADC measuring DC voltage from 100 mV to 10 V.

IC Role / Device Role / Timing Role: Primary reference source for ADC internal gain calibration and offset nulling.

Use Value: 60 µV_rms noise and 0.6 Ω dynamic impedance enable true 22-bit ENOB performance at 10 sps.

Portable Medical Monitors

Industrial Data Loggers

Use Scenario: Wearable ECG patch acquiring biopotential signals with 3.3 V single-supply op-amps and SAR ADC.

IC Role / Device Role / Timing Role: Bias reference for op-amp common-mode level shifting and ADC reference rail.

Use Value: Unconditional stability prevents oscillation when paired with 10 µF ceramic decoupling cap near ADC input stage.

Use Scenario: Ruggedized field logger recording vibration, pressure, and temperature using 12-bit SAR ADCs and microcontroller.

IC Role / Device Role / Timing Role: Shared reference for multiple ADC channels and analog comparator thresholds.

Use Value: ±1% tolerance and 75 ppm/°C max tempco ensure channel-to-channel matching within 0.25% over full industrial temperature range.

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), higher 80 µA quiescent current, 50 ppm/°C max tempco	Requires external resistors for 1.22 V setting; less suitable for ultra-low-power designs	Select when adjustable reference or higher output voltage is needed; not drop-in for fixed 1.22 V use
MAX6008AEUR+T	Fixed 1.25 V output, 1.5 µA max quiescent, 25 ppm/°C max tempco, SC70-3 package	0.03 V higher nominal voltage; requires circuit recalibration if replacing 1.22 V reference	Choose for lowest power consumption where 1.25 V is acceptable and SC70 footprint fits layout

Compared with TLVH431AIDBZR and MAX6008AEUR+T, ZXRE125DRSTOA uniquely delivers 1.220 V ±1% at 4 µA knee current in SOT23-3 - making it optimal for legacy ZRA124/ZRA125-replacement designs requiring exact voltage and footprint compatibility.

Availability

ZXRE125DRSTOA is available at Aetrix Electronics and suitable for battery-powered sensors, precision ADC reference circuits, and portable medical monitors requiring stable component supply with long-term manufacturability assurance.

Supply support for ZXRE125DRSTOA 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, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and Malaysia.

The ZXRE125 belongs to Diodes' precision voltage reference product line, engineered specifically for space-constrained, low-power analog systems where accuracy, stability, and SOT23 compatibility are critical - including portable instrumentation and energy-efficient sensing nodes.

FAQ

What is the minimum operating current for ZXRE125DRSTOA?

The ZXRE125DRSTOA has a specified knee current of 4 µA - the lowest current at which it maintains regulation within tolerance. Below this, output voltage drops nonlinearly. For reliable operation across temperature and load, Diodes recommends ≥8 µA, verified in DS32170 Rev. 8–2 Section 5.

Can ZXRE125DRSTOA replace ZRA125 in existing designs?

Yes - ZXRE125DRSTOA is explicitly designed as a pin-for-pin, functionally compatible replacement for ZRA125 series devices in SOT23-3 packages. It matches the 1.22 V nominal output, same pinout (Anode–Cathode–NC), and shares identical thermal and stability characteristics per Diodes' application note AN-2012-03.

Is ZXRE125DRSTOA stable with large capacitive loads?

Yes - the device is unconditionally stable with capacitive loads up to at least 10 µF, as confirmed by transient response testing in DS32170 Figure 12. No series resistance or isolation capacitor is required, simplifying layout in noise-sensitive data acquisition systems.

What does the 'D' in ZXRE125DRSTOA indicate?

The 'D' denotes ±1% initial output voltage tolerance at 25°C, per Diodes' ordering information table in DS32170 Rev. 8–2 page 4. The full part number breakdown is: ZXRE125 (base), D (1% tol), R (tape & reel), ST (SOT23), OA (standard grade, –40°C to +85°C).

ZXRE125DRSTOA 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:: ±1%

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)

ZXRE125DRSTOA FAQ

1.How can I place an order for ZXRE125DRSTOA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXRE125DRSTOA 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 ZXRE125DRSTOA reliable?

The price and inventory of ZXRE125DRSTOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125DRSTOA is usually 5 days.

3.What payment methods are accepted for ZXRE125DRSTOA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125DRSTOA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXRE125DRSTOA?

ZXRE125DRSTOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXRE125DRSTOA 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 ZXRE125DRSTOA?

For technical support, including ZXRE125DRSTOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125DRSTOA requirements.

6.How does Aetrix verify that ZXRE125DRSTOA is sourced from the original manufacturer or authorized distributors?

All ZXRE125DRSTOA 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 ZXRE125DRSTOA meets industry standards.

7.What is the process for return or replacement of ZXRE125DRSTOA?

All ZXRE125DRSTOA units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125DRSTOA, 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 ZXRE125DRSTOA part is unused and in its original packaging.

Return procedure for ZXRE125DRSTOA:

1.Submit a request within 90 days.

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

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