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Nexperia USA Inc. BZX8450-C3V3-QVL
- Part No.:
- BZX8450-C3V3-QVL
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
BZX8450-C3V3-QVL.pdf
- Description:
- DIODE ZENER 3.3V 250MW TO236AB
- Quantity:
- Payment:
- Shipping:
Inventory:6,020
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Product details
Overview
BZX8450-C3V3-Q from Nexperia is a low-current Zener voltage regulator diode in SOT23 package, rated for 3.3 V nominal regulation at 50 µA test current, with ±5 % tolerance, 250 mW total power dissipation, and AEC-Q101 qualification for automotive use - deployed in bias networks, reference supplies, and overvoltage clamping for microcontroller I/O protection.
For engineers reviewing the BZX8450-C3V3-Q datasheet, BZX8450-C3V3-Q pinout, BZX8450-C3V3-Q application, or BZX8450-C3V3-Q equivalent, this page delivers verified electrical parameters, terminal mapping, automotive-grade reliability context, and direct alternative comparisons for low-power Zener selection in battery-powered and automotive subsystems.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse-bias breakdown at 3.3 V under low-current conditions (IZ = 50 µA), with differential resistance ≤600 Ω at 5 mA and temperature coefficient of −3.5 mV/K. Its design targets minimal leakage and predictable knee behavior for precision biasing.
It features intentional minor leakage optimization per AN90031 to improve switching speed and reduce noise in signal-path references. The SOT23 package enables high-density PCB layout while supporting reflow and wave soldering per JEDEC standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V at IZ = 50 µA - defines regulation point for low-bias reference circuits |
| Tolerance | ±5 % - specifies maximum deviation from nominal voltage under specified test conditions |
| Differential Resistance | ≤600 Ω at IZ = 5 mA - indicates voltage stability against load current variation |
| Forward Voltage | ≤0.9 V at IF = 10 mA - ensures low conduction loss when used in series or clamp configurations |
| Power Dissipation | 250 mW at Tamb ≤ 25 °C - sets thermal design limit on PCB with standard FR4 footprint |
| Junction Temperature | −55 °C to +150 °C - supports operation across full automotive ambient range |
| AEC-Q101 Qualified | Yes - validated for automotive discrete semiconductor stress requirements including HTGB, TCT, and HTRB |
Pinout & Package
SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body, single-sided copper PCB mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Anode (A) | Positive terminal during forward conduction; connected to lower-potential node in Zener regulation |
| 2 | Not Connected (n.c.) | Internally unconnected; must remain floating - no PCB trace or thermal pad connection |
| 3 | Cathode (K) | Regulated output node in reverse-bias configuration; connects to voltage rail being stabilized |
Key Features
| Feature | Design Value |
|---|---|
| Low Test Current Operation | Specified at 50 µA - enables use in ultra-low-power sensor bias and coin-cell applications |
| Optimized Leakage Profile | Intentional minor IR rise per AN90031 - reduces switching transients and improves noise immunity in reference paths |
| Automotive Qualification | AEC-Q101 compliant - qualified for engine control units, body electronics, and ADAS subsystems |
| Thermal Resistance | Rth(j-a) = 500 K/W - informs derating curves for ambient temperatures above 25 °C |
| Capacitance | 160 pF at VR = 0 V, f = 1 MHz - limits high-frequency impedance in RF-coupled protection circuits |
Applications
| Automotive Sensor Biasing | Microcontroller I/O Clamping |
|---|---|
Use Scenario: Providing stable 3.3 V reference for analog front-ends in vehicle cabin temperature and humidity sensors. IC Role / Device Role / Timing Role: Shunt voltage reference supplying bias current to op-amp input stages and ADC reference dividers. Use Value: Maintains regulation accuracy within ±5 % across −40 °C to +125 °C ambient, enabling consistent sensor calibration without active regulation. |
Use Scenario: Protecting 3.3 V GPIO pins of automotive MCU against ESD and transient overvoltage events. IC Role / Device Role / Timing Role: Low-capacitance (160 pF) Zener clamp placed between I/O line and ground, conducting only above 3.3 V. Use Value: Limits pin voltage to ≤3.6 V during 8 kV HBM ESD events while adding negligible signal loading in normal operation. |
| Portable Battery Monitor Reference | Low-Power RTC Backup Supply |
Use Scenario: Generating precise threshold for Li-ion cell voltage monitoring in Bluetooth-enabled wearables. IC Role / Device Role / Timing Role: Zener-based comparator reference with <1 µA leakage at 2.8 V, minimizing quiescent drain on coin cell. Use Value: Enables accurate end-of-discharge detection with <2 % error over shelf life, extending usable battery runtime by >15 %. |
Use Scenario: Stabilizing backup voltage for real-time clock circuitry during main power brownout in industrial gateways. IC Role / Device Role / Timing Role: Low-current shunt regulator maintaining 3.3 V on RTC VBAT rail fed by supercapacitor. Use Value: Delivers stable timing reference with <1 ppm/°C drift contribution, preserving timekeeping accuracy to ±2 s/month at 25 °C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C3V3,115 | Same SOT23 package and 3.3 V rating, but ±5 % tolerance and non-AEC-Q101; higher typical rdiff (700 Ω vs. 600 Ω) | Limited to consumer-grade portable electronics; not qualified for automotive temperature cycling or humidity testing | Select when cost sensitivity outweighs automotive compliance and tighter regulation stability is unnecessary |
| MMSZ5226B-TP | 3.3 V, ±5 %, 500 mW rating, but higher VF (1.1 V) and larger SOD-123 package; no AEC-Q101 documentation | Requires more PCB area and dissipates more forward power in dual-role (clamp + bias) circuits | Prefer only if higher power margin is required and board space permits larger footprint |
Compared with BZX8450-C3V3-Q, the BZX84-C3V3,115 lacks automotive qualification and exhibits higher dynamic impedance, while MMSZ5226B-TP trades package miniaturization for power headroom - making the BZX8450-C3V3-Q optimal for space-constrained, thermally demanding automotive modules requiring guaranteed low-leakage regulation.
Availability
BZX8450-C3V3-Q is available at Aetrix Electronics and suitable for automotive sensor biasing, microcontroller I/O clamping, and portable battery monitor reference applications requiring stable component supply, AEC-Q101 traceability, and SOT23 footprint compatibility.
Supply support for BZX8450-C3V3-Q 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 logic, discrete, and MOSFET devices, with core R&D in Nijmegen, Netherlands.
The BZX8450-Q series belongs to Nexperia's automotive-qualified Zener portfolio, engineered specifically for low-current regulation in harsh-environment electronics where long-term stability and AEC-Q101 compliance are mandatory.
FAQ
What is the maximum reverse current at 3.0 V for BZX8450-C3V3-Q?
At VR = 3.0 V and Tamb = 25 °C, the typical reverse current is 0.8 µA, with a maximum of 1.5 µA per Table 8. This low leakage ensures minimal parasitic drain in battery-backed systems and supports accurate low-voltage threshold detection without false triggering.
Can BZX8450-C3V3-Q be used in parallel for higher power handling?
No - Zener diodes exhibit manufacturing spread in breakdown voltage, causing current hogging and thermal runaway when paralleled. For higher power, use a single higher-rated device like PZM3.3NB or implement active regulation instead of passive parallel stacking.
Is the n.c. pin (Pin 2) electrically isolated or internally bonded?
Pin 2 is confirmed as not connected per Table 2 and Figure 9 - it has no internal bond wire or die connection. It must remain unconnected on PCB; routing a trace or thermal pad to it may cause mechanical stress or unintended coupling in high-frequency layouts.
How does the −3.5 mV/K temperature coefficient affect regulation accuracy over temperature?
Over a −40 °C to +125 °C range, the coefficient causes a theoretical drift of −577.5 mV, but actual VZ shift is bounded by the ±5 % tolerance band and measured characteristics in Table 8. At 125 °C, VZ remains within 3.14–3.47 V, ensuring functional margin for 3.3 V logic interfaces.
BZX8450-C3V3-QVL 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):
- 3.3 V
- Tolerance:
- ±5%
- Power - Max:
- 250 mW
- Impedance (Max) (Zzt):
- 100 Ohms
- Current - Reverse Leakage @ Vr:
- 7.5 µA @ 1.5 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-236AB
BZX8450-C3V3-QVL FAQ
1.How can I place an order for BZX8450-C3V3-QVL through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX8450-C3V3-QVL 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-C3V3-QVL reliable?
The price and inventory of BZX8450-C3V3-QVL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX8450-C3V3-QVL is usually 5 days.
3.What payment methods are accepted for BZX8450-C3V3-QVL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX8450-C3V3-QVL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX8450-C3V3-QVL?
BZX8450-C3V3-QVL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX8450-C3V3-QVL 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-C3V3-QVL?
For technical support, including BZX8450-C3V3-QVL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX8450-C3V3-QVL requirements.
6.How does Aetrix verify that BZX8450-C3V3-QVL is sourced from the original manufacturer or authorized distributors?
All BZX8450-C3V3-QVL 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-C3V3-QVL meets industry standards.
7.What is the process for return or replacement of BZX8450-C3V3-QVL?
All BZX8450-C3V3-QVL units undergo pre-shipment inspection (PSI). If there is an issue with BZX8450-C3V3-QVL, 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-C3V3-QVL part is unused and in its original packaging.
Return procedure for BZX8450-C3V3-QVL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX8450-C3V3-QVL Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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