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Nexperia USA Inc. BZX8450-B3V9R
- Part No.:
- BZX8450-B3V9R
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-B3V9R.pdf
- Description:
- DIODE ZENER 3.9V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:3,995
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Product details
Overview
BZX8450-B3V9R 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 3.9 V regulation at 50 µA test current, with ±2 % tolerance, 250 mW total power dissipation, and 150 °C maximum junction temperature-ideal for battery-powered sensor nodes and portable IoT endpoints.
For engineers reviewing the BZX8450-B3V9R datasheet, BZX8450-B3V9R pinout, BZX8450-B3V9R application, or BZX8450-B3V9R equivalent, key selection criteria include its low 50 µA regulation current, 150 Ω typical differential resistance at 5 mA, -2.7 mV/K temperature coefficient, and intentional cathode-anode asymmetry for noise-sensitive analog front-ends.
Technical Context
This Zener diode operates in reverse breakdown mode with specified regulation at IZ = 50 µA, enabling stable reference generation under microampere-level bias conditions. Its thermal resistance from junction to ambient is 500 K/W on FR4 PCB, supporting operation up to +150 °C ambient.
The device features a non-connected (n.c.) terminal (Pin 2), anode (Pin 1), and cathode (Pin 3), with optimized leakage behavior per AN90031 for fast switching transients and reduced noise coupling in signal conditioning paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V at IZ = 50 µA - defines precise low-current reference point for analog sensing and LDO feedback |
| Tolerance | ±2 % - ensures tight voltage accuracy without trimming in space-constrained portable designs |
| Differential Resistance | 150 Ω max at IZ = 5 mA - limits output impedance drift under small-signal load variations |
| Temperature Coefficient | -2.7 mV/K - enables predictable, linear VZ drift over industrial temperature range (-55 °C to +150 °C) |
| Forward Voltage | 0.9 V max at IF = 10 mA - supports bidirectional clamping or dual-purpose use in protection circuits |
| Total Power Dissipation | 250 mW at Tamb ≤ 25 °C - sets thermal design boundary for SOT23 footprint on standard FR4 PCB |
| Reverse Current | 2.0 µA max at VR = 3.0 V - guarantees minimal quiescent drain in always-on battery monitoring rails |
Pinout & Package
SOT23 plastic surface-mount package: 2.9 mm × 1.3 mm × 1.0 mm body, 1.9 mm pin pitch, single-sided copper FR4 mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode | Connected to lower-potential node; reverse-biased during regulation; carries full Zener current |
| 2 | Not Connected | No internal bond; electrically isolated; must remain unconnected in layout to avoid parasitic coupling |
| 3 | Cathode | Connected to higher-potential node; serves as regulated output reference point; solder point defines Rth(j-sp) = 330 K/W |
Key Features
| Feature | Design Value |
|---|---|
| Low test current regulation | Specified at 50 µA - enables direct use in nanoampere-bias op-amp references and energy-harvesting circuits |
| Optimized leakage profile | Intentional minor rise per AN90031 - reduces switching noise in ADC reference buffers and PLL charge pumps |
| Two-tolerance series | ±2 % (B-series) and ~±5 % (C-series) - allows cost-performance trade-off without redesigning PCB layout |
| High-temperature operation | 150 °C max junction temperature - supports deployment in automotive cabin modules and industrial motor drives |
Applications
| Portable Sensor Biasing | Low-Power ADC Reference |
|---|---|
Use Scenario: Providing stable excitation voltage to MEMS pressure sensors in wearable health monitors. IC Role / Device Role / Timing Role: Zener voltage reference source for ratiometric sensor bridge biasing. Use Value: ±2 % tolerance and -2.7 mV/K TC ensure <0.5 % full-scale error across -20 °C to +70 °C operating range. |
Use Scenario: Generating precision reference for 12-bit SAR ADCs in battery-operated data loggers. IC Role / Device Role / Timing Role: Low-noise analog voltage reference replacing larger shunt regulators. Use Value: 150 Ω differential resistance and 50 µA regulation current minimize reference droop during conversion sampling. |
| IoT Node Power Sequencing | USB-C Port Protection Clamp |
Use Scenario: Enabling controlled wake-up sequencing of BLE SoC and PMIC in coin-cell-powered trackers. IC Role / Device Role / Timing Role: Voltage threshold detector for brown-out reset and supply enable logic. Use Value: 2.0 µA max reverse current at 3.0 V ensures <10 nA standby leakage in always-on supervisor circuits. |
Use Scenario: Clamping transient overvoltage on USB-C CC lines during hot-plug events. IC Role / Device Role / Timing Role: Fast-response shunt clamp protecting Type-C controller GPIOs. Use Value: SOT23 footprint and 40 W non-repetitive peak power rating absorb ESD pulses without board-level TVS. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V9 | ±5 % tolerance, higher 200 Ω rdiff, same 3.9 V nominal, no intentional leakage optimization | Acceptable where cost sensitivity outweighs precision; unsuitable for noise-critical analog front-ends | Select when budget constraints dominate and ±5 % regulation accuracy suffices for digital I/O clamping |
| MMSZ4684T1G | ±5 % tolerance, 300 mW Ptot, 100 Ω rdiff, +2.5 mV/K TC, different SOD-123 footprint | Higher power handling but incompatible SMT land pattern; positive TC causes opposite drift direction | Choose only if board redesign accommodates SOD-123 and system requires higher surge margin over thermal stability |
Compared with BZX8450-B3V9R, the BZX84-C3V9 trades accuracy and noise performance for cost, while MMSZ4684T1G offers higher power but introduces mechanical incompatibility and opposing temperature drift-neither provides the combined low-current precision, SOT23 fit, and noise-optimized leakage of the original.
Availability
BZX8450-B3V9R is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference, IoT node power sequencing, and USB-C port protection requiring stable component supply across high-mix, low-volume production runs.
Supply support for BZX8450-B3V9R 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 advanced packaging and automotive-qualified components.
The BZX8450 series belongs to Nexperia's low-current Zener regulator product line, engineered specifically for ultra-low-power analog reference and biasing in battery-constrained systems-not general-purpose regulation.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX8450-B3V9R is rated for nominal 3.9 V Zener voltage at 50 µA, with a guaranteed breakdown range of 3.82 V to 3.98 V. Its absolute maximum reverse voltage is not defined independently-it enters controlled breakdown above 3.82 V and remains within specification up to its limiting reverse power dissipation of 40 W for 100 µs pulses. Continuous operation must stay within the 250 mW total power limit.
Can Pin 2 be used as a thermal pad or grounded for improved heat dissipation?
No-Pin 2 is explicitly marked "not connected" in the datasheet and has no internal bond wire or die connection. Using it as a thermal pad or grounding it introduces risk of shorting adjacent traces or creating unintended parasitic capacitance. Thermal performance relies solely on the cathode (Pin 3) solder joint, which defines the 330 K/W junction-to-solder-point resistance.
How does the -2.7 mV/K temperature coefficient affect long-term reference stability?
The -2.7 mV/K coefficient means VZ decreases by 2.7 mV per degree Celsius rise in junction temperature. Over a -40 °C to +85 °C ambient range (assuming 25 °C self-heating), total drift is approximately ±135 mV-or ±3.5 % of 3.9 V. This is fully characterized and repeatable, enabling software calibration in closed-loop systems where absolute accuracy is secondary to monotonicity.
Is this device suitable for use in automotive infotainment power supplies?
No-BZX8450-B3V9R is not automotive-qualified. The datasheet explicitly states "Non-automotive qualified products" and excludes qualification per AEC-Q101. While its 150 °C junction rating exceeds typical under-hood temperatures, it lacks the required stress testing, failure analysis, and traceability documentation for automotive safety-critical or infotainment subsystems.
BZX8450-B3V9R 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):
- 3.9 V
- Tolerance:
- ±2%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 2 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-B3V9R FAQ
1.How can I place an order for BZX8450-B3V9R through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-B3V9R 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-B3V9R reliable?
The price and inventory of BZX8450-B3V9R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-B3V9R is usually 5 days.
3.What payment methods are accepted for BZX8450-B3V9R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-B3V9R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-B3V9R?
BZX8450-B3V9R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-B3V9R 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-B3V9R?
For technical support, including BZX8450-B3V9R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-B3V9R requirements.
6.How does Aetrix verify that BZX8450-B3V9R is sourced from the original manufacturer or authorized distributors?
All BZX8450-B3V9R 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-B3V9R meets industry standards.
7.What is the process for return or replacement of BZX8450-B3V9R?
All BZX8450-B3V9R units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-B3V9R, 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-B3V9R part is unused and in its original packaging.
Return procedure for BZX8450-B3V9R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-B3V9R Tags
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