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Diodes Incorporated ZXRE250BSA-7
- Part No.:
- ZXRE250BSA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXRE250BSA-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,550
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Product details
Overview
ZXRE250BSA-7 from Diodes Incorporated is a precision adjustable shunt regulator in SOT23 package, functioning as a 2.495V ±0.5% voltage reference with 40µA typical minimum cathode current for regulation, 0.2Ω dynamic output impedance, and operation from –40°C to +125°C - used in optocoupler linearisation and low-power feedback loops.
For engineers reviewing the ZXRE250BSA-7 datasheet, ZXRE250BSA-7 pinout, ZXRE250BSA-7 application, or ZXRE250BSA-7 equivalent, key selection criteria include ultra-low cathode current requirement, tight initial reference tolerance, thermal stability over industrial temperature range, and compatibility with standard TL431-based circuits requiring improved efficiency.
Technical Context
The ZXRE250BSA-7 implements a bandgap-referenced shunt regulator architecture with internal error amplifier and NPN pass transistor, enabling precise two-resistor programmable output from 2.5V to 36V. Its 40µA min cathode current allows regulation at orders-of-magnitude lower power than standard TL431 devices.
It features low 6–34mV reference voltage deviation across –40°C to +125°C, 1µA typical reference input current, and stable operation with load capacitance <50pF or >300nF - eliminating need for external compensation in most feedback configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±0.5% at +25°C - enables high-accuracy feedback setpoint with minimal calibration overhead |
| Min Cathode Current | 40µA typical - supports regulation in micropower systems where TL431 (typically 100µA) fails |
| Output Impedance | 0.2Ω typical - ensures stable regulation under fast load transients without external bypass |
| Temp Range | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Sink Current Range | 65µA to 100mA - accommodates both standby biasing and active regulation in multi-mode power supplies |
| Dynamic VREF Drift | ≤34mV over full temperature range - maintains <0.014% output variation in closed-loop systems |
| Noise Density | 240nV/√Hz at 10kHz - minimizes noise injection into sensitive analog feedback paths |
Pinout & Package
Package: SOT23 - surface-mount, 3-pin, lead-free, RoHS-compliant plastic package with 2.4mm × 1.3mm footprint and 1.0mm height; thermal resistance θJA = 380°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Current return path / ground reference | Connected to system ground or negative rail; defines reference potential for VREF measurement |
| 2 - Cathode | Regulated sink node / output terminal | Accepts variable current up to 100mA; voltage at this pin is controlled relative to Anode |
| 3 - Reference | Feedback input / precision voltage sense | Internally biased at 2.495V; external resistor divider connects here to set regulated output voltage |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low regulation current | 40µA typical - enables use in energy-harvesting and battery-backed systems where quiescent current is critical |
| Tight initial tolerance | ±0.5% (B grade) - reduces or eliminates need for post-production trimming in precision power supplies |
| Low-output-impedance regulation | 0.2Ω typical - delivers stable voltage despite cathode current variations up to 100mA |
| Wide operating temperature | –40°C to +125°C - supports deployment in automotive engine control units and industrial motor drives |
| Low-noise reference | 240nV/√Hz at 10kHz - preserves signal integrity in isolated feedback paths using optocouplers |
Applications
| Optocoupler Lineariser | Low-Power Shunt Regulator |
|---|---|
|
Use Scenario: Linearising optocoupler transfer function in isolated DC-DC feedback loops. IC Role / Device Role / Timing Role: Precision shunt reference providing stable 2.495V threshold to drive optocoupler LED with predictable current. Use Value: Enables <±1% output voltage regulation across line/load/temperature by replacing nonlinear zener diodes with temperature-stable reference. |
Use Scenario: Providing regulated bias voltage for microcontrollers in battery-powered IoT sensors. IC Role / Device Role / Timing Role: Adjustable shunt regulator sinking only 40µA minimum current to maintain 3.3V rail during deep sleep mode. Use Value: Extends battery life by 3× compared to TL431-based solutions due to sub-100µA regulation threshold. |
| Improved Zener Replacement | Overvoltage Protection Threshold |
|
Use Scenario: Replacing 2.5V zener diodes in analog front-end voltage clamping circuits. IC Role / Device Role / Timing Role: Programmable shunt reference with 0.5% tolerance and <34mV drift, replacing ±5% zeners with poor tempco. Use Value: Reduces calibration effort and improves long-term accuracy of sensor signal conditioning stages. |
Use Scenario: Setting precise overvoltage trip point in 12V automotive power supply monitoring. IC Role / Device Role / Timing Role: Reference input to comparator detecting >13.2V condition via resistor divider on cathode node. Use Value: Achieves ±0.06V trip accuracy over –40°C to +125°C, meeting ISO 16750-2 transient immunity requirements. |
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)N1TR-G1 | Same 2.495V ±0.5% reference, but 100µA min cathode current; higher 0.35Ω output impedance | Not suitable for <65µA cathode current designs; requires larger bias resistor in low-power modes | Select when legacy AP431 footprint compatibility is required and cathode current ≥100µA is guaranteed |
| TL431BIDBZR | 2.495V ±0.5%, but 100µA min cathode current; 0.22Ω output impedance; wider -40°C to +125°C rating | Lacks ultra-low-current capability; exhibits higher noise (350nV/√Hz) and greater tempco drift | Choose only if existing TL431 layout must be reused and system can guarantee ≥100µA cathode current |
Compared with AP431SHA(B)N1TR-G1 and TL431BIDBZR, ZXRE250BSA-7 uniquely enables regulation below 65µA cathode current while maintaining 0.5% tolerance and low noise - making it the sole option for micropower isolated feedback and energy-harvesting applications.
Availability
ZXRE250BSA-7 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body electronics, and medical sensor modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for ZXRE250BSA-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 ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial, automotive, and consumer markets.
ZXRE250 is part of Diodes' precision reference product line, designed specifically for applications demanding ultra-low quiescent current, tight initial tolerance, and robust thermal performance in space-constrained shunt regulator roles.
FAQ
What is the minimum cathode current required for regulation in ZXRE250BSA-7?
The ZXRE250BSA-7 requires only 40µA typical minimum cathode current to maintain regulation - significantly lower than standard TL431 (100µA) or AP431 (100µA). This value is confirmed in the Electrical Characteristics table under IKA(MIN), with a maximum of 65µA across temperature and process variation.
Can ZXRE250BSA-7 replace TL431 in existing designs without layout changes?
Yes - ZXRE250BSA-7 uses the same SOT23 package and identical pinout (Anode–Cathode–Reference) as TL431, enabling direct PCB-level replacement. However, the reduced cathode current requirement may necessitate re-evaluation of bias resistor values to ensure proper startup and regulation margin.
What is the maximum cathode voltage rating for ZXRE250BSA-7?
The absolute maximum cathode-to-anode voltage (VKA) is 40V, per the Absolute Maximum Ratings table. For reliable long-term operation, the recommended maximum is 36V, as specified in the Recommended Operating Conditions section - consistent with its use in 24V and 36V industrial systems.
Does ZXRE250BSA-7 require external compensation capacitors?
No - the device is inherently stable with load capacitances below 50pF or above 300nF, as documented in the Stability Boundary Conditions chart. Unlike many shunt regulators, it does not require external compensation for typical optocoupler or resistor-divider feedback configurations.
ZXRE250BSA-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:
- 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-23-3
ZXRE250BSA-7 FAQ
1.How can I place an order for ZXRE250BSA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE250BSA-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 ZXRE250BSA-7 reliable?
The price and inventory of ZXRE250BSA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE250BSA-7 is usually 5 days.
3.What payment methods are accepted for ZXRE250BSA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE250BSA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE250BSA-7?
ZXRE250BSA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE250BSA-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 ZXRE250BSA-7?
For technical support, including ZXRE250BSA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE250BSA-7 requirements.
6.How does Aetrix verify that ZXRE250BSA-7 is sourced from the original manufacturer or authorized distributors?
All ZXRE250BSA-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 ZXRE250BSA-7 meets industry standards.
7.What is the process for return or replacement of ZXRE250BSA-7?
All ZXRE250BSA-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE250BSA-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 ZXRE250BSA-7 part is unused and in its original packaging.
Return procedure for ZXRE250BSA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZXRE250BSA-7 Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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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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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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