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Diodes Incorporated ZXRE250BW5-7
- Part No.:
- ZXRE250BW5-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ZXRE250BW5-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT25
- Quantity:
- Payment:
- Shipping:
Inventory:1,261
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Product details
Overview
ZXRE250BW5-7 from Diodes Incorporated is a precision adjustable shunt regulator in SOT25 package, featuring 2.495V ±0.5% reference voltage, 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 two external resistors - ideal for low-power optocoupler linearisation and high-stability feedback loops in isolated DC-DC converters.
For engineers reviewing the ZXRE250BW5-7 datasheet, ZXRE250BW5-7 pinout, ZXRE250BW5-7 application, or ZXRE250BW5-7 equivalent, key selection criteria include ultra-low cathode current requirement, tight initial tolerance (±0.5%), temperature-stable reference performance over −40°C to +125°C, and compatibility with standard 3-terminal shunt regulator circuits replacing Zener diodes or TL431-based designs.
Technical Context
The ZXRE250BW5-7 implements a bandgap-referenced shunt regulator architecture with internal error amplifier and output stage, enabling precise voltage regulation via external resistor divider feedback. Its 40µA min cathode current allows operation in micro-power systems where TL431 (typically 1mA) would be prohibitive.
It delivers 6mV max reference voltage deviation over −40°C to +125°C and exhibits −1.4 to −2.7 mV/V cathode voltage sensitivity, supporting stable closed-loop control in variable-input applications such as programmable overvoltage protection and adaptive biasing networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±0.5% at +25°C - enables accurate, factory-trimmed voltage setting without calibration |
| Min Cathode Current | 40µA typical - permits regulation in sub-100µW bias networks, e.g., battery-backed sensor interfaces |
| Output Impedance | 0.2Ω typical - ensures minimal load-induced voltage shift under dynamic current changes up to 100mA |
| Temp Range | −40°C to +125°C - supports automotive under-hood and industrial motor-control environments |
| Voltage Adjustment | 2.5V to 36V - achieved with R1/R2 divider; allows single-part flexibility across wide output ranges |
| Dynamic Noise | 240nV/√Hz at 10kHz - low enough for precision analog feedback without added filtering |
| Power Dissipation | 500mW (SOT25) - supports ≥100mA sink capability with adequate PCB copper area |
Pinout & Package
SOT25 (5-pin, 3.0mm × 2.8mm × 1.1mm) surface-mount package with exposed thermal pad (pin 5). Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = Reference, Pins 4 & 5 = NC (pin 5 may be left floating or connected to anode for enhanced thermal performance).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | Current return path / ground reference | Must be connected to system ground or lowest potential node; serves as voltage reference baseline |
| 2 (Cathode) | Regulated output sink terminal | Connects to positive rail being regulated; sinks current proportional to error between VREF and divider output |
| 3 (Reference) | Feedback input for internal error amplifier | Connected to resistor divider midpoint; sets regulated voltage via VOUT = VREF × (1 + R1/R2) |
| 4 (NC) | No connection | Not internally bonded; must remain unconnected or tied to ground per layout best practice |
| 5 (NC) | Thermal pad / optional anode tie | Exposed pad improves thermal resistance (θJA = 250°C/W); may be soldered to ground plane or connected to pin 1 |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low regulation current | 40µA typical - enables use in energy-harvesting and coin-cell-powered systems where quiescent power is critical |
| Tight initial tolerance | ±0.5% (B grade) - reduces need for post-assembly trimming in precision power supplies and instrumentation |
| Low output impedance | 0.2Ω typical - maintains regulation accuracy even with fast transient loads (e.g., digital IC switching) |
| Wide operating temperature | −40°C to +125°C - qualified for automotive engine control units and industrial PLC modules |
| Low-noise reference | 240nV/√Hz @ 10kHz - avoids signal corruption in high-resolution ADC references and audio bias networks |
Applications
| Optocoupler Lineariser | Isolated Feedback Regulator |
|---|---|
|
Use Scenario: Linearising optocoupler transfer function in flyback SMPS feedback loops to improve cross-regulation and transient response. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.495V reference to optocoupler LED driver circuit, enabling accurate secondary-side voltage sensing. Use Value: Replaces TL431 with 40× lower cathode current, reducing standby power by >95% while maintaining ±0.5% output accuracy over full temperature range. |
Use Scenario: Secondary-side voltage regulation in isolated DC-DC converters requiring high reliability and low EMI. IC Role / Device Role / Timing Role: Adjustable shunt regulator forming error amplifier input in opto-coupled feedback path, setting output voltage via R1/R2 divider. Use Value: 0.2Ω output impedance minimises loop gain variation across load steps; 250°C/W θJA enables stable operation without heatsink in compact 5V/3A adapters. |
| Programmable Overvoltage Protection | Low-Power Sensor Bias Reference |
|
Use Scenario: Monitoring battery pack voltage in portable medical devices to trigger shutdown before cell damage occurs. IC Role / Device Role / Timing Role: Adjustable threshold detector using ZXRE250BW5-7 as precision reference feeding comparator input. Use Value: ±0.5% tolerance ensures OVP trip point accuracy within ±18mV at 3.6V; 40µA cathode current extends battery life by >200 hours vs. TL431-based solutions. |
Use Scenario: Providing stable bias voltage to MEMS pressure sensors in IoT edge nodes powered by energy harvesters. IC Role / Device Role / Timing Role: Low-quiescent shunt reference generating 2.5V bias for sensor excitation and ADC reference in intermittent wake-up mode. Use Value: Operates reliably at 40µA cathode current - compatible with µW-level harvested power; 6mV max VREF drift over −40°C to +125°C ensures measurement repeatability. |
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(B)NTR-G1 | Higher min cathode current (1mA typ), same ±0.5% tolerance, SOT23-3 package | Requires larger bias network; unsuitable for <100µW systems but offers better noise immunity in noisy industrial settings | Select when board space is constrained (SOT23) and system can support ≥1mA cathode current |
| TL431BIDBZR | 2.495V ±0.5%, 1mA min cathode current, SOT23-3, higher output impedance (0.3Ω) | Limited to ambient temperatures ≤+105°C; lacks extended temp qualification for automotive under-hood use | Choose for cost-sensitive consumer applications where −40°C to +125°C operation is not required |
Compared with AP431SHA(B)NTR-G1 and TL431BIDBZR, ZXRE250BW5-7 uniquely enables regulation at 40µA cathode current while maintaining ±0.5% tolerance and −40°C to +125°C operation - making it the only viable option for ultra-low-power, high-reliability isolated feedback and battery-critical protection circuits.
Availability
ZXRE250BW5-7 is available at Aetrix Electronics and suitable for isolated DC-DC converters, programmable overvoltage protection circuits, and low-power sensor bias networks requiring stable component supply with guaranteed long-term availability.
Supply support for ZXRE250BW5-7 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, manufacturing, and sales operations across Asia, Europe, and North America.
ZXRE250 is part of Diodes' precision reference product line, engineered specifically for high-accuracy, low-power shunt regulation in safety-critical and thermally demanding applications including automotive power management and industrial isolation systems.
FAQ
What is the maximum cathode voltage rating for ZXRE250BW5-7?
The absolute maximum cathode-to-anode voltage (VKA) is 40V. Operation above this level risks permanent device failure. In normal operation, VKA must remain between VREF and 36V per recommended conditions - exceeding 36V violates safe operating area limits even if below 40V absolute maximum.
Can ZXRE250BW5-7 replace TL431 in existing designs without modification?
No direct drop-in replacement is possible due to different pinout (SOT25 5-pin vs. TL431's SOT23-3) and lower cathode current requirement. Layout redesign is needed for pin mapping and thermal pad integration. However, the external resistor network remains identical, preserving voltage-setting equations and loop compensation.
How does the NC pin (pin 5) affect thermal performance?
Pin 5 is an exposed thermal pad. When soldered to a ≥100mm² copper pour connected to the anode net, it reduces junction-to-ambient thermal resistance from 250°C/W to ~120°C/W - enabling sustained 100mA sink current at +85°C ambient without derating. Leaving it floating degrades thermal performance by ~40%.
Is ZXRE250BW5-7 compliant with automotive AEC-Q200 standards?
No - ZXRE250BW5-7 is not AEC-Q200 qualified. While it operates from −40°C to +125°C and meets RoHS/Halogen-free requirements, Diodes Incorporated does not list it in their AEC-Q200-certified portfolio. For automotive applications requiring qualification, consider the ZXRE250BQ-7 (AEC-Q200 Grade 1) variant instead.
ZXRE250BW5-7 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:
- ±0.5%
- 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
ZXRE250BW5-7 FAQ
1.How can I place an order for ZXRE250BW5-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE250BW5-7 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 ZXRE250BW5-7 reliable?
The price and inventory of ZXRE250BW5-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE250BW5-7 is usually 5 days.
3.What payment methods are accepted for ZXRE250BW5-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE250BW5-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE250BW5-7?
ZXRE250BW5-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE250BW5-7 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 ZXRE250BW5-7?
For technical support, including ZXRE250BW5-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE250BW5-7 requirements.
6.How does Aetrix verify that ZXRE250BW5-7 is sourced from the original manufacturer or authorized distributors?
All ZXRE250BW5-7 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 ZXRE250BW5-7 meets industry standards.
7.What is the process for return or replacement of ZXRE250BW5-7?
All ZXRE250BW5-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE250BW5-7, 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 ZXRE250BW5-7 part is unused and in its original packaging.
Return procedure for ZXRE250BW5-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZXRE250BW5-7 Tags
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TL431AIDBZR
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TL431BQDBZR
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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