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Nexperia USA Inc. BZX8450-B1V8-QR
- Part No.:
- BZX8450-B1V8-QR
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B1V8-QR.pdf
- Description:
- DIODE ZENER 1.8V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:5,444
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Product details
Overview
BZX8450-B1V8-QR from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 1.8 V regulation at 50 µA test current, with ±2 % tolerance, 0.9 V forward voltage at 10 mA, and 250 mW total power dissipation - optimized for battery-powered sensor nodes and automotive microcontroller reset circuits.
For engineers reviewing the BZX8450-B1V8-QR datasheet, BZX8450-B1V8-QR pinout, BZX8450-B1V8-QR application, or BZX8450-B1V8-QR equivalent, this page provides verified electrical characteristics, AEC-Q101 qualification status, thermal resistance data (Rth(j-a) = 500 K/W), and validated automotive-grade replacement options - all critical for low-leakage, low-voltage rail stabilization in space-constrained designs.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable 1.8 V output across load variations by conducting reverse current above its breakdown threshold. Its specified 50 µA test current enables accurate low-bias operation without excessive quiescent draw.
The BZX8450-B1V8-QR features intentional minor leakage current optimization per AN90031 for fast switching transients and reduced noise coupling - distinct from standard Zeners - and is qualified to AEC-Q101 for under-hood automotive environments up to +150 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 1.8 V at IZ = 50 µA - defines precise low-voltage reference point for MCU brown-out detection or analog sensor biasing |
| Tolerance | ±2 % - ensures tight regulation window (1.76 V to 1.84 V) critical for 1.8 V logic rail monitoring |
| Forward Voltage | 0.9 V at IF = 10 mA - limits conduction loss during power-up or fault conditions |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 PCB |
| Junction Temperature | 150 °C max - supports operation in high-temperature automotive compartments |
| Reverse Current | 1.0 µA max at VR = 1.0 V - confirms low leakage essential for battery longevity in always-on systems |
| Differential Resistance | 600 Ω max at IZ = 50 µA - quantifies regulation stiffness under light-load conditions |
| Thermal Resistance | 500 K/W junction-to-ambient - determines temperature rise under steady-state bias (e.g., +125 K at 250 mW) |
Pinout & Package
Package: SOT23 plastic surface-mount package (2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm lead pitch), rated for reflow and wave soldering per IPC-J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; reverse-biased during regulation; must be routed with minimal trace inductance for transient stability |
| 2 | Not Connected (n.c.) | Internally unconnected; no PCB pad required; must remain floating to avoid parasitic coupling or ESD path disruption |
| 3 | Cathode (K) | Connects to regulated voltage rail; serves as reference output node; cathode tab provides primary thermal path to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in nanoamp-level standby circuits without compromising regulation accuracy |
| AEC-Q101 qualification | Qualified for automotive applications - guarantees reliability under temperature cycling, humidity, and mechanical shock per discrete semiconductor stress test standard |
| Optimized leakage profile | Intentional minor leakage per AN90031 - reduces switching noise and improves transient response vs. conventional Zeners |
| Tight voltage tolerance | ±2 % (B-series) - eliminates need for post-production trimming in 1.8 V reference paths for ADCs or comparators |
| Small footprint | SOT23 package - allows placement adjacent to ICs in dense layouts while maintaining thermal isolation from heat sources |
Applications
| Microcontroller Reset Circuit | Automotive Sensor Biasing |
|---|---|
Use Scenario: Providing clean, stable 1.8 V reference to enable reset assertion when main supply drops below operational threshold. IC Role / Device Role / Timing Role: Shunt voltage reference that sinks current only when VCC falls below 1.8 V × (1 ± tolerance), triggering POR circuitry. Use Value: Enables deterministic reset behavior at ultra-low quiescent current (<1 µA standby leakage), extending battery life in telematics modules. |
Use Scenario: Supplying regulated bias voltage to MEMS pressure sensor front-end amplifiers in engine control units. IC Role / Device Role / Timing Role: Low-noise voltage reference stabilizing amplifier operating point against supply ripple and thermal drift. Use Value: Maintains sensor offset stability within ±1.5 mV over −40 °C to +125 °C due to matched temperature coefficient (−3.5 mV/K). |
| Portable IoT Node Reference | Low-Power ADC Reference |
Use Scenario: Generating stable 1.8 V reference for RF transceiver LDO feedback or crystal oscillator bias in BLE/Wi-Fi edge devices. IC Role / Device Role / Timing Role: Precision shunt regulator establishing reference potential for internal bandgap circuits and clock buffers. Use Value: Delivers <0.5 % regulation error at 50 µA load, eliminating need for external op-amp buffer in space-constrained wearables. |
Use Scenario: Serving as input reference for 12-bit SAR ADC in battery-powered data loggers measuring thermistor or strain gauge signals. IC Role / Device Role / Timing Role: Low-drift voltage reference defining full-scale ADC range independent of supply variation. Use Value: Achieves <±0.2 LSB integral nonlinearity contribution via 600 Ω differential resistance and <1 µA IR at 1.0 V reverse bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5221BS-7-F | 1.8 V, ±5 % tolerance, 200 mW rating, SOT23 package - looser tolerance and lower power limit than BZX8450-B1V8-QR | Acceptable for non-critical biasing but unsuitable for automotive reset circuits requiring AEC-Q101 and ±2 % stability | Select only for cost-sensitive consumer applications where 1.71–1.89 V range is acceptable and qualification is not mandated |
| BZX84-C1V8 | 1.8 V, ±5 % tolerance, same SOT23 package, no AEC-Q101 qualification - lacks intentional leakage optimization and automotive stress testing | Functional in lab prototypes but not approved for production automotive ECUs or safety-relevant subsystems | Use only for pre-compliance evaluation; replace with BZX8450-B1V8-QR before DVT/PVT stages in automotive programs |
Compared with MMBZ5221BS-7-F and BZX84-C1V8, the BZX8450-B1V8-QR offers tighter ±2 % regulation, AEC-Q101 certification, and engineered leakage behavior - making it the sole choice for production automotive voltage monitoring and battery-constrained industrial sensing where long-term parametric stability is mandatory.
Availability
BZX8450-B1V8-QR is available at Aetrix Electronics and suitable for automotive ECU design, portable medical sensor calibration, and industrial IoT node power management requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for BZX8450-B1V8-QR 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
Nexperia is a global semiconductor expert focused on high-volume, high-reliability discrete and logic devices, with leadership in automotive-qualified components and energy-efficient solutions.
The BZX8450-Q series belongs to Nexperia's AEC-Q101-qualified Zener regulator portfolio, engineered specifically for low-current, low-voltage stabilization in automotive and portable electronics where precision, noise immunity, and long-term reliability are non-negotiable.
FAQ
What is the maximum reverse voltage the BZX8450-B1V8-QR can withstand before breakdown?
The BZX8450-B1V8-QR has a nominal Zener voltage of 1.8 V at 50 µA, with a guaranteed breakdown range of 1.76 V to 1.84 V (±2 %). It is not rated for sustained reverse voltage above this range - operation beyond 1.84 V will cause increasing reverse current and thermal stress. Absolute maximum reverse voltage is not defined; safe operation requires limiting current via series resistance to stay within 250 mW power dissipation.
Does the 'QR' suffix indicate tape-and-reel packaging or a specific revision?
The 'QR' suffix denotes Nexperia's standard tape-and-reel packaging for SOT23 devices: 3,000 units per reel, compliant with EIA-481-D standards. It does not indicate a revision level - the underlying die and electrical specifications match Rev. 3 (July 2024) of the BZX8450-Q series datasheet, and 'QR' is a packaging code, not a version identifier.
Can BZX8450-B1V8-QR replace BZX84-C1V8 in an existing design?
Yes, electrically and physically - both are SOT23-packaged 1.8 V Zeners with identical pinout (anode/cathode/n.c.). However, BZX8450-B1V8-QR adds ±2 % tolerance, AEC-Q101 qualification, and optimized leakage per AN90031. Replacement improves accuracy and automotive compliance but requires validation of thermal margin due to identical 250 mW rating.
Why does the datasheet specify parameters at 50 µA instead of higher currents like 5 mA?
Specifying at 50 µA reflects the device's design purpose: ultra-low-power voltage reference. At this current, dynamic impedance is minimized for stable regulation in battery-critical applications. Higher currents (e.g., 5 mA) increase power dissipation and self-heating, degrading accuracy - the 50 µA test point ensures optimal performance where quiescent current matters most, such as in always-on sensor bias rails.
BZX8450-B1V8-QR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450-Q
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 1.8 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-B1V8-QR FAQ
1.How can I place an order for BZX8450-B1V8-QR through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B1V8-QR 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 BZX8450-B1V8-QR reliable?
The price and inventory of BZX8450-B1V8-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B1V8-QR is usually 5 days.
3.What payment methods are accepted for BZX8450-B1V8-QR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B1V8-QR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B1V8-QR?
BZX8450-B1V8-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B1V8-QR 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 BZX8450-B1V8-QR?
For technical support, including BZX8450-B1V8-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B1V8-QR requirements.
6.How does Aetrix verify that BZX8450-B1V8-QR is sourced from the original manufacturer or authorized distributors?
All BZX8450-B1V8-QR 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 BZX8450-B1V8-QR meets industry standards.
7.What is the process for return or replacement of BZX8450-B1V8-QR?
All BZX8450-B1V8-QR units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B1V8-QR, 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 BZX8450-B1V8-QR part is unused and in its original packaging.
Return procedure for BZX8450-B1V8-QR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B1V8-QR Tags
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MMBZ5240B-7-F
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
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BZT52C15S-7-F
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MM5Z5V1ST1G
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SMAJ4744A-TP
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