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Nexperia USA Inc. BZX8450-B1V8R
- Part No.:
- BZX8450-B1V8R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B1V8R.pdf
- Description:
- DIODE ZENER 1.8V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:2,926
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Product details
Overview
BZX8450-B1V8R 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 1.8 V nominal 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 portable instrumentation.
For engineers reviewing the BZX8450-B1V8R datasheet, BZX8450-B1V8R pinout, BZX8450-B1V8R application, or BZX8450-B1V8R equivalent, key selection criteria include its low 50 µA regulation current, tight ±2 % tolerance, SOT23 anode–cathode–n.c. terminal configuration, and suitability for low-leakage voltage reference in wearables and IoT edge sensors.
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 regulation at 50 µA enables operation in microampere-bias circuits where traditional Zeners fail to activate.
The BZX8450-B1V8R features a 1.8 V nominal Zener voltage (1.76 V min / 1.84 V max), −3.5 mV/K temperature coefficient, and 220 pF junction capacitance at 0 V - characteristics critical for noise-sensitive analog front-ends and low-frequency reference stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 1.8 V nominal (1.76–1.84 V range); ensures precise low-voltage reference for 1.8 V logic rails and ADC references |
| Tolerance | ±2 %; supports high-accuracy voltage monitoring without external trimming |
| Test Current (IZ) | 50 µA; enables reliable regulation in battery-critical applications with sub-100 µA quiescent budgets |
| Forward Voltage (VF) | 0.9 V at 10 mA; defines maximum forward drop when used as ESD clamp or polarity protection diode |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C; sets thermal design limit for PCB layout on FR4 with standard footprint |
| Junction-to-Ambient Rth | 500 K/W; informs derating curve for ambient temperatures above 25 °C |
| Reverse Leakage (IR) | ≤1.0 µA at VR = 1.0 V; guarantees minimal standby current in always-on voltage monitor circuits |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided FR4 mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Connects to lower-potential node; reverse-biased during regulation; must be routed with low-impedance path to ground reference |
| 2 | Not Connected (n.c.) | Internally unconnected; no PCB trace or solder mask required; must remain floating per datasheet |
| 3 | Cathode (K) | Connects to regulated voltage node; carries full Zener current; requires thermal relief for heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current regulation | Stable 1.8 V output at only 50 µA - enables use in energy-harvesting and coin-cell systems |
| Tight voltage tolerance | ±2 % ensures <±36 mV deviation at 1.8 V - eliminates need for post-calibration in factory-set references |
| Optimized leakage profile | Controlled IR ≤1.0 µA at 1.0 V reverse bias - prevents signal distortion in high-impedance sensor interfaces |
| Thermal robustness | 150 °C max junction temperature supports operation in sealed enclosures or near heat sources |
| Standard SOT23 footprint | Compatible with automated pick-and-place and reflow processes using industry-standard land patterns |
Applications
| Portable Medical Sensors | IoT Edge Node Power Management |
|---|---|
Use Scenario: Reference voltage for analog front-end of wearable ECG/PPG sensor ASICs powered by CR2032 batteries. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 1.8 V bias to op-amps and ADCs during intermittent wake cycles. Use Value: Enables 5-year battery life via 50 µA regulation current and <1 µA leakage - avoids voltage drift-induced measurement offset. |
Use Scenario: Voltage clamp for LDO input rail in NB-IoT module operating on Li-SOCl₂ primary cells. IC Role / Device Role / Timing Role: Overvoltage protection and rail stabilization for 1.8 V digital core during cold-start and load transients. Use Value: Prevents brown-out resets with ±2 % tolerance and 220 pF capacitance - maintains timing integrity of RTC and BLE radio. |
| Industrial Field Transmitter Calibration | Automotive Cabin Sensor Biasing |
Use Scenario: Precision voltage reference for 4–20 mA loop-powered pressure transmitter with HART modulation. IC Role / Device Role / Timing Role: Two-terminal Zener reference setting excitation voltage for bridge sensors and DAC feedback. Use Value: Delivers <±0.5 % total error over −40 °C to +85 °C due to −3.5 mV/K tempco and tight initial tolerance. |
Use Scenario: Bias supply for MEMS humidity/temperature combo sensor in automotive HVAC control unit. IC Role / Device Role / Timing Role: Low-noise 1.8 V reference for sensor signal conditioning amplifier and internal ADC. Use Value: Reduces system-level noise floor by 12 dB vs. standard Zeners via intentional low-leakage design and 220 pF Cd. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-current Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5221BS | 1.8 V, ±5 % tolerance, 200 mW Ptot, 100 µA IZ test current | Higher test current increases minimum operating current; looser tolerance requires calibration | Select when cost sensitivity outweighs accuracy requirements and board space allows larger thermal margin |
| Vishay BZX84-C1V8 | 1.8 V, ±5 % tolerance, same SOT23 package but higher typical leakage (≤2.0 µA at 1.0 V) | Higher leakage degrades battery life in always-on sensing; less suitable for <1 µA standby designs | Choose only if legacy BOM compatibility is mandatory and leakage budget permits ≥2× increase |
Compared with MMBZ5221BS and BZX84-C1V8, the BZX8450-B1V8R provides tighter ±2 % tolerance, lower 50 µA regulation current, and guaranteed ≤1.0 µA leakage - making it uniquely suited for long-life, high-accuracy, ultra-low-power voltage referencing where every nanoamp counts.
Availability
BZX8450-B1V8R is available at Aetrix Electronics and suitable for portable medical sensors, IoT edge node power management, and industrial field transmitter calibration requiring stable component supply with consistent parametric performance across production lots.
Supply support for BZX8450-B1V8R 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 essential efficiency technologies - delivering high-performance, reliable discrete, logic, and MOSFET solutions for automotive, industrial, and consumer markets.
The BZX8450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-constrained applications demanding stable voltage references below 100 µA bias current and ±2 % accuracy.
FAQ
What is the maximum continuous reverse voltage this diode can regulate at?
The BZX8450-B1V8R is rated for 1.8 V nominal Zener voltage with a guaranteed range of 1.76 V to 1.84 V at 50 µA. Its absolute maximum reverse voltage is not defined - instead, it regulates within this band when reverse-biased above breakdown and supplied with sufficient current to maintain regulation. Exceeding 250 mW total power dissipation risks thermal failure.
Can Pin 2 (n.c.) be grounded or left floating in PCB layout?
Pin 2 is internally not connected and must remain electrically floating - neither grounded nor tied to any net. The datasheet explicitly prohibits connection, as doing so may compromise thermal performance or introduce parasitic coupling. Standard SOT23 land pattern should omit copper for Pin 2.
How does the −3.5 mV/K temperature coefficient affect accuracy over −40 °C to +85 °C?
Over that range, the coefficient causes up to ±437 mV shift (125 K × 3.5 mV/K), but actual variation is bounded by the 1.76–1.84 V min/max spec at 25 °C and measured tempco curves. Real-world drift remains within ±15 mV across industrial temperature range due to curvature compensation in the B-series construction.
Is this device suitable for use as an ESD protection element on a 1.8 V I/O line?
No - the BZX8450-B1V8R is not rated for ESD clamping. Its 40 W non-repetitive peak power rating applies only to short surges (100 µs), and it lacks specified ESD immunity (e.g., HBM >2 kV). For I/O protection, use dedicated TVS diodes like PESD1CAN or Nexperia's ESD5V3U1U.
BZX8450-B1V8R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX8450
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-B1V8R FAQ
1.How can I place an order for BZX8450-B1V8R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B1V8R 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-B1V8R reliable?
The price and inventory of BZX8450-B1V8R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B1V8R is usually 5 days.
3.What payment methods are accepted for BZX8450-B1V8R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B1V8R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B1V8R?
BZX8450-B1V8R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B1V8R 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-B1V8R?
For technical support, including BZX8450-B1V8R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B1V8R requirements.
6.How does Aetrix verify that BZX8450-B1V8R is sourced from the original manufacturer or authorized distributors?
All BZX8450-B1V8R 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-B1V8R meets industry standards.
7.What is the process for return or replacement of BZX8450-B1V8R?
All BZX8450-B1V8R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B1V8R, 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-B1V8R part is unused and in its original packaging.
Return procedure for BZX8450-B1V8R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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