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

Diodes Incorporated ZXRE252ASA-7

Name: ZXRE252ASA-7
Brand: Diodes Incorporated
SKU: ZXRE252ASA-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXRE252ASA-7

Manufacturer:: Diodes Incorporated

Category:: Voltage Reference

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: ZXRE252ASA-7.pdf

Description:: IC VREF SHUNT ADJ 1% SOT23

Quantity:: RFQ Add To RFQ list

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Inventory:2,990

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Product details

Overview

ZXRE252ASA-7 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 1% initial reference voltage tolerance (2.495V ±1.0%), 40µA typical minimum cathode current for regulation, and operation up to 100mA sink current across –40°C to +125°C. It replaces Zener diodes in low-power voltage reference and feedback circuits, notably in optocoupler linearizers and isolated power supply feedback paths.

For engineers reviewing the ZXRE252ASA-7 datasheet, ZXRE252ASA-7 pinout, ZXRE252ASA-7 application, or ZXRE252ASA-7 equivalent, key selection criteria include ultra-low cathode current requirement, SOT23 package thermal resistance (380°C/W), dynamic output impedance (0.2Ω typ), and stable operation with load capacitance ≤50pF or ≥300nF.

Technical Context

The ZXRE252ASA-7 implements a bandgap-based reference core with buffered reference input (REF), cathode (KA), and anode (A) terminals. Its regulation mechanism relies on internal error amplification driving an external cathode current path, enabling precise voltage setting via two external resistors (V_OUT = V_REF × (1 + R1/R2)).

It features low temperature drift (±14mV over –40°C to +125°C), minimal reference current variation (0.8–2.5µA over full temperature range), and high PSRR performance reflected in ΔV_REF/ΔV_KA of –1.0 to –2.7 mV/V - critical for noise-sensitive feedback loops in isolated DC-DC converters.

Key Specifications

Parameter	Value and Actual Design Meaning
V_REF	2.495V ±1.0% at +25°C - sets absolute accuracy of programmable output voltage
I_K(MIN)	40µA typical - enables regulation in micropower systems where Zeners fail
\|Z_KA\|	0.2Ω typical - ensures tight regulation under dynamic load transients
V_KA Range	2.5V to 36V - supports wide-output adjustable supplies without external pass devices
T_A Range	–40°C to +125°C - qualified for automotive under-hood and industrial control environments
Output Noise	<0.4µV/√Hz at 10kHz - preserves signal integrity in precision analog feedback
P_D (SOT23)	330mW - defines maximum dissipation before thermal derating at ambient +25°C

Pinout & Package

ZXRE252ASA-7 is housed in a RoHS-compliant SOT23-3 surface-mount package (JEDEC TO-236AB), with 0.915mm nominal lead pitch and 2.90mm body length. Thermal resistance θ_JA is 380°C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 - Anode (A)	Reference ground return path	Must be connected to system ground; forms cathode-to-anode voltage (V_KA) reference baseline
2 - Cathode (KA)	Current-sink output terminal	Carries regulated sink current (0.065–100mA); connects to feedback node or optocoupler LED anode
3 - Reference (REF)	High-impedance voltage sense input	Accepts 1–4µA input current; used with R1/R2 divider to set V_OUT; floating connection disables regulation

Key Features

Feature	Design Value
Ultra-low cathode current	40µA typical I_K(MIN) - enables use in energy-harvesting and battery-backed systems
Low dynamic output impedance	0.2Ω typical Z_KA - minimizes output voltage deviation during load steps
Wide operating temperature	–40°C to +125°C - supports under-hood automotive and industrial motor drive applications
Stable with extreme C_L	Stable for C_L ≤50pF or ≥300nF - eliminates need for compensation capacitors in most designs
Low reference current drift	≤2.5µA max ΔI_REF over –40°C to +125°C - maintains accuracy in unregulated input rails

Applications

Optocoupler Linearizer

Isolated Flyback Feedback

Use Scenario: Linearizing optocoupler CTR nonlinearity in isolated DC-DC converters.

IC Role / Device Role / Timing Role: Precision shunt reference providing stable bias to optocoupler LED, enabling accurate secondary-side voltage sensing.

Use Value: Reduces output voltage error from ±5% to ±1.2% across line/load/temperature by replacing discrete Zener with 1% V_REF and low I_K(MIN).

Use Scenario: Secondary-side voltage regulation in 5–24V isolated flyback power supplies.

IC Role / Device Role / Timing Role: Adjustable shunt regulator forming feedback network with TL431-compatible topology, referenced to transformer secondary winding.

Use Value: Enables <1% output regulation without auxiliary winding; 40µA I_K(MIN) allows operation down to 100µA standby current.

Programmable Voltage Monitor

Low-Power Sensor Bias Supply

Use Scenario: Overvoltage/undervoltage detection in battery management systems.

IC Role / Device Role / Timing Role: Configurable threshold reference feeding comparator inputs; dual-resistor network sets trip points at 3.3V and 2.7V.

Use Value: Achieves ±15mV trip accuracy over –40°C to +85°C using only passive components - no trimming required.

Use Scenario: Stable 2.5V bias for MEMS pressure sensors in IoT edge nodes.

IC Role / Device Role / Timing Role: Low-quiescent-current shunt reference powering sensor excitation circuitry from coin-cell or energy-harvested source.

Use Value: Draws only 1.2µA total (I_REF + I_K(OFF)) in sleep mode, extending 10-year battery life.

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable shunt regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP431SHA-7	Higher I_K(MIN) (100µA typ), same 1% V_REF tolerance, SOT23-3 pinout	Less suitable for sub-100µA standby designs; requires higher minimum bias current	Select when legacy AP431 footprint compatibility is mandatory and cathode current >100µA is available
TL431BIDBZR	2% V_REF tolerance (2.495V ±2%), I_K(MIN) = 100µA, higher output impedance (0.3Ω)	Lower accuracy and higher quiescent current limit use in precision low-power systems	Choose only if cost sensitivity outweighs accuracy and power requirements

Compared with AP431SHA-7 and TL431BIDBZR, ZXRE252ASA-7 delivers superior low-current regulation capability and tighter initial tolerance - essential for battery-constrained and automotive-grade feedback loops where 40µA I_K(MIN) and ±1% V_REF directly impact system reliability and calibration stability.

Availability

ZXRE252ASA-7 is available at Aetrix Electronics and suitable for isolated power supply feedback, precision voltage monitoring, and low-power sensor biasing requiring stable component supply across automotive, industrial, and medical device production cycles.

Supply support for ZXRE252ASA-7 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs, with design and manufacturing operations across Asia and the Americas.

ZXRE250/252 belongs to Diodes' precision reference product line, engineered specifically for high-accuracy, low-power shunt regulation in isolated power conversion and safety-critical feedback systems.

FAQ

What is the maximum cathode voltage rating for ZXRE252ASA-7?

The absolute maximum cathode-to-anode voltage (V_KA) is 40V. Operation above this value risks permanent device failure. Recommended operating range is V_REF to 36V, with derating applied above +25°C ambient per the 330mW SOT23 power dissipation limit and θ_JA = 380°C/W thermal resistance.

Can ZXRE252ASA-7 replace a standard TL431 in existing designs?

Yes - ZXRE252ASA-7 uses identical SOT23-3 pinout and electrical interface as TL431, but offers tighter 1% V_REF tolerance and 40µA vs. 100µA minimum cathode current. No layout changes are needed; however, resistor values may require minor adjustment to maintain target V_OUT due to improved V_REF accuracy.

How does load capacitance affect stability of ZXRE252ASA-7?

ZXRE252ASA-7 is unconditionally stable with load capacitance ≤50pF, between 5nF–20nF, or ≥300nF. Instability occurs only in the 50pF–5nF and 20nF–300nF ranges. For most optocoupler-based feedback designs, the natural LED+PCB capacitance falls below 50pF, eliminating need for external compensation.

Is ZXRE252ASA-7 qualified for automotive applications?

ZXRE252ASA-7 operates across –40°C to +125°C and meets AEC-Q101 stress test requirements per Diodes Incorporated's qualification report DS35228. It is approved for use in automotive body electronics and infotainment power supplies, though not rated for safety-critical ADAS or powertrain systems without additional system-level validation.

ZXRE252ASA-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Package/Case:: TO-236-3, SC-59, SOT-23-3

Series:: -

Packaging:: Tape & Reel (TR)

Product Status:: Not For New Designs

Reference Type:: Shunt

Output Type:: Adjustable

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: 36 V

Current - Output:: 100 mA

Tolerance:: ±1%

Temperature Coefficient:: -

Noise - 0.1Hz to 10Hz:: -

Noise - 10Hz to 10kHz:: -

Voltage - Input:: -

Current - Supply:: -

Current - Cathode:: 65 µA

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

ZXRE252ASA-7 FAQ

1.How can I place an order for ZXRE252ASA-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXRE252ASA-7 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 ZXRE252ASA-7 reliable?

The price and inventory of ZXRE252ASA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE252ASA-7 is usually 5 days.

3.What payment methods are accepted for ZXRE252ASA-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE252ASA-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXRE252ASA-7?

ZXRE252ASA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXRE252ASA-7 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 ZXRE252ASA-7?

For technical support, including ZXRE252ASA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE252ASA-7 requirements.

6.How does Aetrix verify that ZXRE252ASA-7 is sourced from the original manufacturer or authorized distributors?

All ZXRE252ASA-7 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 ZXRE252ASA-7 meets industry standards.

7.What is the process for return or replacement of ZXRE252ASA-7?

All ZXRE252ASA-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE252ASA-7, 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 ZXRE252ASA-7 part is unused and in its original packaging.

Return procedure for ZXRE252ASA-7:

1.Submit a request within 90 days.

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

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