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Diodes Incorporated ZXRE252BSA-7
- Part No.:
- ZXRE252BSA-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZXRE252BSA-7.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,439
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Product details
Overview
ZXRE252BSA-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 typical dynamic output impedance, and operation from –40°C to +125°C. It replaces Zener diodes in low-power linear optocoupler feedback paths and programmable voltage monitoring circuits.
For engineers reviewing the ZXRE252BSA-7 datasheet, ZXRE252BSA-7 pinout, ZXRE252BSA-7 application, or ZXRE252BSA-7 equivalent, key selection criteria include ultra-low cathode current requirement, tight initial reference tolerance, temperature-stable VREF deviation (≤34mV over –40°C to +125°C), and compatibility with external resistor programming from 2.5V to 36V.
Technical Context
The ZXRE252BSA-7 implements a bandgap-referenced shunt regulator architecture with internal error amplifier and NPN pass transistor. Its reference node (REF) senses voltage via external resistive divider, enabling precise output voltage setting independent of cathode-anode voltage up to 36V.
It delivers stable regulation with <1.4mV/V cathode voltage sensitivity, ≤2.5µA reference input current variation over full temperature range, and maintains stability with load capacitance ≥50pF or ≥5nF depending on cathode current-no external compensation required in standard configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495V ±0.5% at +25°C - enables high-accuracy voltage threshold setting in sensing and protection circuits |
| Min Cathode Current | 40µA typical - allows regulation in micropower systems where supply current is constrained below 100µA |
| Output Impedance | 0.2Ω typical - ensures minimal output voltage shift under dynamic load changes up to 100mA sink current |
| Temp Range | –40°C to +125°C - supports automotive under-hood and industrial control environments without derating |
| Voltage Range | 2.5V to 36V adjustable - permits single-part design across multiple output rails using only two external resistors |
| Ref Input Current | 1–4µA at +25°C - reduces power loss in high-impedance feedback networks and improves noise immunity |
| Thermal Resistance | 380°C/W (SOT23) - defines maximum power dissipation limit (330mW at +25°C ambient) for thermal design |
Pinout & Package
Package: SOT23 - surface-mount, 3-pin plastic package with 0.915mm nominal lead pitch, 2.40mm × 1.30mm body size, and 0.40mm typical thickness. Optimized for automated placement and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Anode | Current return path / ground reference | Connected to system ground; forms common reference for REF and cathode current return |
| 2 - Cathode | Regulated output sink terminal | Carries total load current (up to 100mA); voltage at this pin is set by REF divider network |
| 3 - Ref | Internal reference voltage sense input | High-impedance node (1–4µA input) that compares external divider voltage to 2.495V bandgap reference |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low regulation current | 40µA typical minimum cathode current enables operation in energy-harvesting and battery-backed systems |
| Tight initial tolerance | ±0.5% (B grade) eliminates need for post-production trimming in precision voltage monitor designs |
| Low dynamic impedance | 0.2Ω typical output impedance minimizes output voltage droop during transient load steps |
| Wide operating temperature | –40°C to +125°C junction range supports deployment in automotive engine control and industrial motor drives |
| Low-noise reference | 200nV/√Hz input noise at 10kHz enables use in high-resolution ADC reference buffers and analog signal chains |
Applications
| Optocoupler Lineariser | Overvoltage Protection |
|---|---|
|
Use Scenario: Linear feedback loop in isolated DC-DC converters using PC817 or similar optocouplers. IC Role / Device Role / Timing Role: Shunt regulator providing stable 2.5V reference to optocoupler LED anode, enabling accurate secondary-side voltage sensing. Use Value: 40µA min cathode current allows operation with <100µA LED current, reducing isolation barrier power loss and improving efficiency at light loads. |
Use Scenario: Threshold detection in 12V/24V automotive power rails to trigger shutdown during load dump events. IC Role / Device Role / Timing Role: Adjustable shunt element in comparator-based overvoltage latch circuit, set to trip at 15.2V via R1/R2 divider. Use Value: ±0.5% VREF tolerance ensures trip point accuracy within ±76mV, meeting ISO 7637-2 pulse 5a compliance margins. |
| Programmable Reference | Improved Zener Replacement |
|
Use Scenario: Configurable voltage reference for microcontroller ADC calibration in portable test equipment. IC Role / Device Role / Timing Role: Precision 3.3V reference generator using external 10kΩ/10.2kΩ divider, replacing fixed-voltage ICs. Use Value: 34mV VREF drift over –40°C to +125°C yields <0.1% full-scale error contribution to 12-bit ADC measurements. |
Use Scenario: Low-power voltage clamp in IoT sensor node power management, replacing 3.3V Zener diode. IC Role / Device Role / Timing Role: Active shunt regulator maintaining stable 3.3V rail during sleep mode with <1µA quiescent current. Use Value: 0.2Ω output impedance provides 10× lower effective knee resistance than 3.3V Zener, improving regulation under varying leakage currents. |
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 | Same 2.495V reference, but 100µA min cathode current (2.5× higher than ZXRE252BSA-7) | Not suitable for sub-100µA cathode current designs; requires higher bias current in feedback networks | Select when higher sink current headroom is needed and ultra-low IK(MIN) is not critical |
| TL431BIDBZR | 2.495V reference, ±0.5%, but 100µA min cathode current and 0.5Ω typical ZKA | Higher output impedance increases voltage error under load transients; wider VKA max (37V vs 40V) | Prefer for cost-sensitive industrial supplies where 40µA regulation current is unnecessary |
Compared with AP431SHA(B)NTR-G1 and TL431BIDBZR, the ZXRE252BSA-7 uniquely enables regulation in micropower systems (<100µA cathode current) while delivering lower output impedance (0.2Ω) and tighter thermal drift performance (≤34mV over –40°C to +125°C), making it optimal for battery-constrained and high-precision feedback applications.
Availability
ZXRE252BSA-7 is available at Aetrix Electronics and suitable for optocoupler linearisation, overvoltage protection, programmable reference generation, and improved Zener replacement requiring stable component supply across automotive, industrial, and IoT design cycles.
Supply support for ZXRE252BSA-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 integrated circuits, specializing in high-performance, high-reliability components for power management, signal integrity, and protection applications.
The ZXRE250/252 product line targets precision voltage regulation in space-constrained, low-power systems-designed specifically to replace Zener diodes with superior temperature stability, lower cathode current, and tighter initial tolerance.
FAQ
What is the absolute maximum cathode voltage rating for ZXRE252BSA-7?
The absolute maximum cathode-to-anode voltage is 40V per the DS35228 datasheet. Exceeding this rating may cause permanent device failure. Operation at 36V is permitted under recommended conditions, and the device maintains regulation stability up to that level with proper thermal management in the SOT23 package.
Can ZXRE252BSA-7 be used without external resistors?
No-it is an adjustable shunt regulator requiring two external resistors to set output voltage. With REF pin unconnected or floating, the device cannot regulate; the minimum functional configuration connects REF to a resistive divider between cathode and anode to establish the desired VOUT = VREF(1 + R1/R2).
How does the 40µA minimum cathode current affect PCB layout?
The 40µA specification means the cathode must receive ≥40µA at all times to maintain regulation. Layout must ensure no unintended current paths (e.g., PCB leakage, moisture, or ESD protection diodes) divert cathode current below this threshold-especially critical in high-impedance feedback networks and humid environments.
Is ZXRE252BSA-7 compatible with lead-free reflow profiles?
Yes-ZXRE252BSA-7 is fully RoHS 3 compliant (2015/863/EU), halogen- and antimony-free, and rated for standard lead-free reflow profiles with peak temperature up to 260°C. The SOT23 package meets JEDEC J-STD-020D moisture sensitivity level 1, requiring no bake prior to assembly.
ZXRE252BSA-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
ZXRE252BSA-7 FAQ
1.How can I place an order for ZXRE252BSA-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXRE252BSA-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 ZXRE252BSA-7 reliable?
The price and inventory of ZXRE252BSA-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXRE252BSA-7 is usually 5 days.
3.What payment methods are accepted for ZXRE252BSA-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXRE252BSA-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXRE252BSA-7?
ZXRE252BSA-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXRE252BSA-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 ZXRE252BSA-7?
For technical support, including ZXRE252BSA-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXRE252BSA-7 requirements.
6.How does Aetrix verify that ZXRE252BSA-7 is sourced from the original manufacturer or authorized distributors?
All ZXRE252BSA-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 ZXRE252BSA-7 meets industry standards.
7.What is the process for return or replacement of ZXRE252BSA-7?
All ZXRE252BSA-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZXRE252BSA-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 ZXRE252BSA-7 part is unused and in its original packaging.
Return procedure for ZXRE252BSA-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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