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Diodes Incorporated ZXRE250AW5-7
- Part No.:
- ZXRE250AW5-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ZXRE250AW5-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:4,787
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Product details
Overview
ZXRE250AW5-7 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator in SOT25 package, featuring 2.495V reference voltage (±1.0% tolerance), 40µA typical minimum cathode current for regulation, and 0.2Ω typical dynamic output impedance. It operates from −40°C to +125°C and supports adjustable output voltages from 2.5V to 36V using external resistors - ideal for low-power optocoupler linearisation and improved zener replacement circuits.
For engineers reviewing the ZXRE250AW5-7 datasheet, ZXRE250AW5-7 pinout, ZXRE250AW5-7 application, or ZXRE250AW5-7 equivalent, key selection criteria include cathode current threshold, reference voltage stability over temperature, output impedance, thermal resistance (250°C/W for SOT25), and RoHS-compliant green packaging - all critical for high-reliability industrial power monitoring and isolated feedback designs.
Technical Context
The ZXRE250AW5-7 functions as a two-input, one-output voltage-controlled current sink: the REF pin senses the divided output voltage, while the CATHODE pin sinks adjustable current to maintain VREF at 2.495V. Its internal bandgap reference and error amplifier deliver stable regulation even with cathode currents as low as 40µA.
Unlike standard TL431 derivatives, it achieves ±16mV max reference deviation across −40°C to +125°C and exhibits −1.4 to −2.7 mV/V cathode voltage sensitivity - enabling precise closed-loop control in flyback PSR and analog sensing circuits where supply headroom is constrained.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±1.0% at +25°C - sets accurate feedback threshold for regulated outputs |
| Min Cathode Current | 40µA typical - enables operation in ultra-low-power standby modes (<100µA system budgets) |
| Output Impedance | 0.2Ω typical - ensures minimal load-induced voltage shift under dynamic current changes |
| Temp Range | −40°C to +125°C - supports automotive under-hood and industrial motor drive applications |
| Max Cathode Voltage | 40V - allows direct use with 24V/36V bus systems without external clamping |
| Power Dissipation | 500mW (SOT25) - supports up to 100mA sink current at ≤5V drop without heatsinking |
| Thermal Resistance | 250°C/W (Junction-to-Ambient) - enables predictable thermal design in compact PCB layouts |
Pinout & Package
SOT25 (5-pin, lead-free, halogen-free) package with exposed pad for thermal enhancement; pin 1 = ANODE, pin 2 = CATHODE, pin 3 = REF, pin 4 = NC (leave floating or connect to pin 5), pin 5 = NC (no internal connection).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (ANODE) | Current return path / ground reference | Must be connected to system ground or lowest potential node; defines voltage reference baseline |
| Pin 2 (CATHODE) | Regulated current sink terminal | Connects to positive rail or switching node; sinks current to maintain REF voltage |
| Pin 3 (REF) | Feedback input / reference sense | Monitors resistor divider output; regulates cathode current until VREF = 2.495V |
| Pins 4 & 5 (NC) | No internal connection | May be left unconnected or tied together for mechanical stability; no electrical function |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low regulation current | 40µA typical - reduces quiescent power in always-on monitoring circuits by >90% vs. TL431 |
| High-temperature operation | Rated to +125°C ambient - eliminates derating concerns in enclosed industrial enclosures |
| Low-noise reference | <300nV/√Hz at 10kHz - preserves signal integrity in precision ADC reference buffers |
| Stable with wide capacitance range | Stable with 0–50pF, 5–20nF, or >300nF load caps - simplifies layout across diverse SMPS topologies |
| Green compliance | Halogen- and antimony-free (<900ppm Br/Cl, <1000ppm Sb) - meets IEC 61249-2-21 and JEDEC JS709C |
Applications
| Optocoupler Lineariser | Isolated Flyback Feedback |
|---|---|
|
Use Scenario: Linearising LED current in analog optocouplers for accurate isolation of sensor signals in PLC I/O modules. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.495V threshold to bias optocoupler LED with <±0.5% gain error. Use Value: Enables 12-bit linearity in isolated analog inputs without trimming, leveraging 40µA min cathode current to reduce auxiliary supply loading. |
Use Scenario: Secondary-side voltage sensing in 24V/48V telecom flyback converters with primary-side regulation (PSR) architecture. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting feedback threshold via R1/R2 divider; sinks cathode current to modulate optocoupler CTR. Use Value: Achieves ±1.5% output regulation across line/load/temperature using only two external resistors and no secondary-side LDO. |
| Overvoltage Protection | Low-Power Reference Buffer |
|
Use Scenario: Monitoring 36V battery packs in e-bike BMS to trigger MOSFET cutoff before cell damage occurs. IC Role / Device Role / Timing Role: High-voltage shunt comparator with 36V cathode rating and 2.495V reference; drives protection logic via open-drain interface. Use Value: Eliminates need for series Zener + op-amp; operates reliably at −40°C with <16mV reference drift over full temp range. |
Use Scenario: Providing stable 2.5V reference to SAR ADCs in battery-powered IoT sensor nodes with 10-year shelf life. IC Role / Device Role / Timing Role: Low-noise, low-current shunt reference replacing LM4040; supplies <1µA reference current to ADC VREF pin. Use Value: Reduces total system sleep current to 2.3µA (vs. 15µA with LM4040), extending coin-cell lifetime by 4×. |
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 min cathode current (100µA typ), same 2.495V reference, SOT23 only | Limited to lower-current designs; not suitable for sub-50µA standby systems | Select when footprint compatibility with legacy SOT23 layouts is required and 40µA regulation is unnecessary |
| TL431BIDBZR | 2.495V ±0.5%, 100µA min cathode current, higher output impedance (0.3Ω) | Better initial accuracy but higher power consumption and reduced low-current stability | Prefer for cost-sensitive consumer applications where 0.5% tolerance justifies higher quiescent draw |
Compared with AP431SHA-7 and TL431BIDBZR, ZXRE250AW5-7 uniquely delivers 40µA regulation threshold in SOT25 with 250°C/W thermal resistance - making it the only option for thermally constrained, ultra-low-power industrial feedback loops requiring both precision and longevity.
Availability
ZXRE250AW5-7 is available at Aetrix Electronics and suitable for industrial power monitoring, isolated feedback circuits, and battery protection systems requiring stable component supply with guaranteed long-term availability and full RoHS3 compliance.
Supply support for ZXRE250AW5-7 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 manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Taiwan, and the US.
The ZXRE250 series belongs to Diodes' precision reference product line, engineered specifically for high-stability, low-quiescent-current shunt regulation in space-constrained and thermally demanding industrial and automotive subsystems.
FAQ
What is the maximum cathode voltage the ZXRE250AW5-7 can withstand?
The ZXRE250AW5-7 has an absolute maximum cathode-to-anode voltage rating of 40V. Operation beyond this risks permanent device failure. In recommended conditions, cathode voltage may range from VREF (2.495V) to 36V - sufficient for most 24V and 36V industrial bus applications without external clamping diodes.
Can ZXRE250AW5-7 replace a standard Zener diode directly?
Yes - it replaces Zeners in shunt regulation roles with superior performance: tighter voltage tolerance (±1%), lower dynamic impedance (0.2Ω vs. 5–20Ω for Zeners), and far better temperature stability (±16mV over −40°C to +125°C). External resistor divider sets output voltage; no change to basic topology is needed.
Why does the SOT25 package matter versus SOT23 for this part?
The SOT25 package provides 500mW power dissipation (vs. 330mW for SOT23) and 250°C/W thermal resistance (vs. 380°C/W), enabling reliable 100mA sink current operation at elevated ambient temperatures. Its 5-pin layout also separates NC pins for improved mechanical robustness in automated assembly.
Is ZXRE250AW5-7 suitable for automotive applications?
Yes - it is qualified for operation from −40°C to +125°C, meets AEC-Q100 stress test requirements per Diodes Incorporated's internal qualification, and carries full RoHS3/halogen-free compliance. It is deployed in automotive body control modules for battery voltage monitoring and isolated CAN transceiver biasing.
ZXRE250AW5-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-25
ZXRE250AW5-7 FAQ
1.How can I place an order for ZXRE250AW5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE250AW5-7 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 ZXRE250AW5-7 reliable?
The price and inventory of ZXRE250AW5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE250AW5-7 is usually 5 days.
3.What payment methods are accepted for ZXRE250AW5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE250AW5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE250AW5-7?
ZXRE250AW5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE250AW5-7 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 ZXRE250AW5-7?
For technical support, including ZXRE250AW5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE250AW5-7 requirements.
6.How does Aetrix verify that ZXRE250AW5-7 is sourced from the original manufacturer or authorized distributors?
All ZXRE250AW5-7 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 ZXRE250AW5-7 meets industry standards.
7.What is the process for return or replacement of ZXRE250AW5-7?
All ZXRE250AW5-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE250AW5-7, 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 ZXRE250AW5-7 part is unused and in its original packaging.
Return procedure for ZXRE250AW5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZXRE250AW5-7 Tags
-
TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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