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

Diodes Incorporated ZXRE125ERSTOB

Name: ZXRE125ERSTOB
Brand: Diodes Incorporated
SKU: ZXRE125ERSTOB
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXRE125ERSTOB

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: E-Line-3

Datasheet:: ZXRE125ERSTOB.pdf

Description:: IC VREF SHUNT 2% E-LINE

Quantity:: RFQ Add To RFQ list

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Inventory:3,284

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Product details

Overview

ZXRE125ERSTOB from Diodes Incorporated is a micropower bandgap voltage reference delivering a precise 1.220 V output with ±2% initial tolerance, 20 ppm/°C typical temperature coefficient, and stable operation from 4 µA to 20 mA supply current - used in portable instrumentation and battery-powered precision analog signal chains.

For engineers reviewing the ZXRE125ERSTOB datasheet, ZXRE125ERSTOB pinout, ZXRE125ERSTOB application, or ZXRE125ERSTOB equivalent, key selection factors include knee current (4 µA), load-capacitance immunity, SOT23-3 package compatibility, and tolerance-grade availability (0.5%–3%) for low-power reference design validation.

Technical Context

The ZXRE125ERSTOB implements a two-terminal shunt-mode bandgap reference architecture, operating as a precision 1.22 V Zener-like device with reverse breakdown behavior. It requires no external biasing components and functions with minimal quiescent current while maintaining regulation across wide load-current variations (8 µA–20 mA).

Its unconditionally stable design tolerates arbitrary capacitive loads without oscillation, eliminating need for output isolation resistors or compensation networks. Temperature drift is minimized via internal curvature correction, yielding 20 ppm/°C typical TC over –40°C to +85°C.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.220 V ±2% at 100 µA - defines system ADC/VREF or sensor excitation accuracy baseline
Temp Coefficient	20 ppm/°C typical - ensures ≤±1.7 mV drift over full –40°C to +85°C range
Knee Current	4 µA - minimum current enabling regulation onset; enables ultra-low-power sleep-state reference hold
Operating Current	8 µA to 20 mA - supports direct connection to high-impedance dividers or low-dropout LDO feedback paths
Dynamic Impedance	0.2 Ω typical at 1 mA - maintains output stability under fast transient load steps
Noise (10Hz–10kHz)	60 µV_rms - suitable for 12-bit+ data acquisition without added filtering
Capacitive Load Stability	Unconditional - allows direct buffering with op-amps or driving of ADC input capacitance without phase margin risk

Pinout & Package

SOT23-3 package: 3-pin surface-mount plastic case with gull-wing leads, 0.95 mm pitch, 2.80 × 2.64 × 1.12 mm footprint - optimized for space-constrained PCB layouts in portable electronics.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Anode)	Reference Cathode Connection	Connected to system ground or low-impedance return path; reverse-biased terminal during normal operation
Pin 2 (Cathode)	Reference Output Terminal	Delivers regulated 1.22 V when current flows from Pin 2 to Pin 1; serves as VREF node for downstream circuitry
Pin 3 (NC)	No Connect	Internally unconnected; must be left floating or tied to Pin 1 per datasheet guidance to avoid parasitic coupling

Key Features

Feature	Design Value
Shunt-mode topology	Enables simple 2-terminal integration into existing feedback or bias networks without series pass element
4 µA knee current	Permits use in energy-harvesting or coin-cell-powered systems where standby current budget is sub-10 µA
0.2 Ω dynamic impedance	Reduces output voltage perturbation under 100 µA load transients, improving ADC sampling consistency
Unconditional capacitive stability	Eliminates need for external RC snubbers when driving op-amp inputs or SAR ADC sample capacitors
Green molding compound	Meets RoHS and halogen-free requirements without compromising thermal or mechanical reliability

Applications

Battery-Powered Sensors

Precision Data Loggers

Use Scenario: Low-power environmental sensor node powered by CR2032 coin cell, sampling temperature/humidity every 5 minutes.

IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.22 V for ADC reference and sensor excitation.

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

Use Scenario: Portable handheld data logger acquiring thermocouple and strain gauge signals in field service applications.

IC Role / Device Role / Timing Role: Primary reference source for 16-bit sigma-delta ADC and analog front-end gain calibration.

Use Value: 0.2 Ω dynamic impedance prevents reference droop during multiplexed channel switching; 60 µV_rms noise avoids post-processing filtering.

Medical Wearables

Industrial IoT Transmitters

Use Scenario: Disposable ECG patch with integrated analog front-end and Bluetooth LE radio, operating on thin-film battery.

IC Role / Device Role / Timing Role: Precision VREF for biopotential amplifier offset trimming and ADC conversion.

Use Value: SOT23-3 footprint minimizes board area; unconditional stability avoids oscillation when driving ESD protection diodes at ADC input.

Use Scenario: Loop-powered 4–20 mA transmitter with HART modulation, mounted in hazardous-area enclosures.

IC Role / Device Role / Timing Role: Stable reference for DAC-based current loop control and sensor linearization.

Use Value: ±2% tolerance and 20 ppm/°C TC ensure <0.1% total error over 10-year field deployment without recalibration.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TLVH431ACDBVR	Adjustable 1.24 V reference; requires two external resistors; 80 µA min cathode current	Used where programmable reference voltage or tighter initial tolerance (0.5%) is required	Select when design flexibility outweighs fixed-voltage simplicity and ultra-low knee current
MAX6008AEUR+T	1.25 V output; 30 ppm/°C max TC; 1.5 µA max quiescent current; SC70-3 package	Preferred for sub-µA standby systems needing lower IQ than ZXRE125's 4 µA knee	Choose when lowest possible power dominates over tighter TC or established SOT23 footprint

Compared with TLVH431ACDBVR and MAX6008AEUR+T, the ZXRE125ERSTOB offers the optimal balance of fixed 1.22 V accuracy, ultra-low knee current, and proven SOT23-3 layout compatibility - making it ideal for cost-sensitive, space-constrained, and battery-life-critical designs where external resistor networks or newer package transitions are undesirable.

Availability

ZXRE125ERSTOB is available at Aetrix Electronics and suitable for battery-powered sensors, precision data loggers, and medical wearables requiring stable component supply with long-term lifecycle assurance.

Supply support for ZXRE125ERSTOB 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, energy-efficient components for consumer, industrial, and automotive markets.

The ZXRE125 belongs to Diodes' precision voltage reference product line, engineered specifically for ultra-low-power, space-constrained analog systems where shunt-mode simplicity and thermal stability are critical design requirements.

FAQ

What is the minimum operating current for reliable regulation?

The ZXRE125ERSTOB achieves stable regulation starting at 4 µA (knee current), verified across –40°C to +85°C. Below this, output voltage drops nonlinearly; design margin recommends ≥6 µA for guaranteed 1.22 V ±2% performance across temperature and unit variation.

Can ZXRE125ERSTOB drive an op-amp input directly?

Yes - its unconditional capacitive-load stability allows direct connection to op-amp inputs with up to 10 nF of total input capacitance, including PCB trace and op-amp C_IN, without oscillation or settling degradation, per DS32170 Rev. 8–2 test data.

Is Pin 3 required to be connected?

No - Pin 3 is internally unconnected (NC). The datasheet explicitly states it may be left floating or tied to Pin 1 (anode) to reduce stray coupling; neither configuration affects regulation performance or stability.

How does the 2% tolerance grade affect system accuracy?

The ±2% initial tolerance (Grade E) contributes directly to absolute error in ADC reference or sensor excitation paths. When combined with 20 ppm/°C TC, total error remains within ±0.25% over 0°C–70°C, sufficient for 10-bit systems without calibration.

ZXRE125ERSTOB 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:: ±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:: E-Line (TO-92 compatible)

ZXRE125ERSTOB FAQ

1.How can I place an order for ZXRE125ERSTOB through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXRE125ERSTOB 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 ZXRE125ERSTOB reliable?

The price and inventory of ZXRE125ERSTOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE125ERSTOB is usually 5 days.

3.What payment methods are accepted for ZXRE125ERSTOB?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE125ERSTOB transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXRE125ERSTOB?

ZXRE125ERSTOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXRE125ERSTOB 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 ZXRE125ERSTOB?

For technical support, including ZXRE125ERSTOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE125ERSTOB requirements.

6.How does Aetrix verify that ZXRE125ERSTOB is sourced from the original manufacturer or authorized distributors?

All ZXRE125ERSTOB 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 ZXRE125ERSTOB meets industry standards.

7.What is the process for return or replacement of ZXRE125ERSTOB?

All ZXRE125ERSTOB units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE125ERSTOB, 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 ZXRE125ERSTOB part is unused and in its original packaging.

Return procedure for ZXRE125ERSTOB:

1.Submit a request within 90 days.

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

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