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Nexperia USA Inc. BZX38450-B3V3-QX
- Part No.:
- BZX38450-B3V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B3V3-QX.pdf
- Description:
- DIODE ZENER 3.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,907
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Product details
Overview
BZX38450-B3V3-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 3.3 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-B3V3-QX datasheet, BZX38450-B3V3-QX pinout, BZX38450-B3V3-QX application, or BZX38450-B3V3-QX equivalent, key selection factors include its low-bias operation at 50 µA, 3.3 V stabilization accuracy, thermal resistance of 110 K/W to solder point, and suitability for battery-powered sensor nodes and automotive body electronics.
Technical Context
This device operates as a two-terminal shunt voltage reference, maintaining stable 3.3 V output across load variations by conducting reverse current above its breakdown threshold. Its differential resistance is ≤600 Ω at IZ = 50 µA and ≤100 Ω at IZ = 1 mA, enabling tight regulation under light-load conditions.
Designed for low-power biasing, it features a temperature coefficient of −3.5 mV/K and diode capacitance of 160 pF at 0 V, supporting noise-sensitive analog front-ends. The intentional minor leakage rise in B-series variants optimizes switching speed and reduces noise per AN90031.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.3 V at IZ = 50 µA - precise low-current regulation point for micro-power circuits |
| Tolerance | ±2 % - ensures tight voltage accuracy without trimming in production |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - supports continuous operation on standard FR4 PCBs |
| Differential Resistance | ≤600 Ω at 50 µA / ≤100 Ω at 1 mA - maintains regulation stability across varying load currents |
| Forward Voltage | ≤0.9 V at IF = 10 mA - enables use as low-drop rectifier or clamp in dual-role designs |
| Junction Temperature | −55 °C to +150 °C - meets extended automotive ambient requirements |
| AEC-Q101 Qualified | Yes - validated for automotive body control modules and infotainment power rails |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package, 1.7 mm × 1.25 mm × 0.95 mm body, 1.3 mm lead pitch, cathode marked by bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables direct regulation from high-impedance sources like microcontroller GPIO or sensor bias networks |
| Automotive qualification | AEC-Q101 compliant - qualified for under-hood and cabin applications requiring long-term reliability |
| Optimized noise performance | B-series intentional leakage rise per AN90031 - reduces switching transients in feedback paths of LDOs and ADC references |
| Thermal efficiency | Rth(j-sp) = 110 K/W - enables effective heat transfer to PCB copper via cathode pad, critical for compact automotive layouts |
Applications
| Automotive Body Control Module | Portable Gas Sensor Biasing |
|---|---|
Use Scenario: Providing stable 3.3 V reference for MCU ADC inputs and CAN transceiver bias in door module ECUs. IC Role / Device Role / Timing Role: Shunt voltage regulator maintaining precision supply for analog sensing and communication interfaces. Use Value: ±2 % tolerance and −3.5 mV/K TC ensure consistent measurement accuracy across −40 °C to +125 °C operating range. |
Use Scenario: Biasing electrochemical gas sensors in handheld air quality monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Low-current Zener reference establishing fixed sensor excitation voltage with minimal quiescent drain. Use Value: 50 µA test current enables regulation directly from 3.6 V LiMnO₂ cells without additional current-limiting resistors. |
| Industrial IoT Edge Node | Medical Wearable Power Rail Clamp |
Use Scenario: Stabilizing 3.3 V rail for ultra-low-power BLE SoC and MEMS accelerometer in predictive maintenance sensor nodes. IC Role / Device Role / Timing Role: Passive voltage clamp protecting sensitive digital logic against transient overvoltage during wake-up events. Use Value: 160 pF capacitance and fast turn-on reduce ESD-induced timing jitter on clock inputs and reset lines. |
Use Scenario: Clamping auxiliary 3.3 V supply in ECG patch devices to prevent overvoltage damage to analog front-end amplifiers. IC Role / Device Role / Timing Role: Fail-safe shunt regulator ensuring rail stays within absolute maximum ratings during battery swap or charger insertion. Use Value: 300 mW power rating and 150 °C junction limit support continuous operation during clinical-grade thermal cycling tests. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C3V3-Q | ±5 % tolerance, higher leakage at low voltage, same SOD323 package | Acceptable where cost sensitivity outweighs precision; not recommended for ADC reference use | Select when tighter tolerance is unnecessary and BOM simplification is prioritized |
| MMSZ5226B-7-F | 3.3 V ±5 %, 500 mW rating, SOD-123 package, non-AEC-Q101 | Larger footprint and no automotive qualification; suitable only for commercial-grade portable devices | Choose only for non-automotive, space-tolerant designs requiring higher power margin |
Compared with BZX38450-B3V3-QX, the BZX384-C3V3-Q sacrifices accuracy for cost and the MMSZ5226B-7-F trades qualification and size for higher power headroom-making the B-series part optimal for precision automotive and battery-constrained applications.
Availability
BZX38450-B3V3-QX is available at Aetrix Electronics and suitable for automotive body electronics, portable sensor biasing, and industrial IoT edge nodes requiring stable component supply with AEC-Q101 assurance and tight voltage tolerance.
Supply support for BZX38450-B3V3-QX 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 BZX38450-Q series belongs to Nexperia's automotive-grade Zener regulator portfolio, engineered specifically for low-current, high-stability voltage reference in harsh-environment electronics such as vehicle lighting, ADAS subsystems, and battery management interfaces.
FAQ
What is the maximum reverse current at 3.3 V before regulation onset?
At 3.3 V reverse bias and Tj = 25 °C, the typical reverse current is 1.5 µA. This value remains below 7.5 µA across the full operating temperature range, confirming sharp knee behavior essential for reliable low-current regulation.
Can BZX38450-B3V3-QX be used in series with another Zener for higher voltage reference?
No-this device is not characterized or guaranteed for series operation. Its differential resistance and temperature coefficient are specified only for single-device shunt regulation. Cascading introduces unpredictable voltage drift and thermal coupling effects not covered in the datasheet.
Is the SOD323 package compatible with standard reflow profiles for lead-free assembly?
Yes-the device is qualified for JEDEC J-STD-020D reflow profiles. The recommended footprint (Fig. 10) uses 0.5 mm solder lands and 0.6 mm solder paste openings, supporting peak temperatures up to 260 °C with controlled ramp rates.
How does the B-series leakage optimization affect long-term stability?
The intentional minor leakage rise in BZX38450-B variants improves dynamic response and reduces noise but does not degrade long-term parametric stability. Life test data shows <0.1 % VZ shift after 1000 hours at 85 °C/85 % RH, meeting AEC-Q101 reliability requirements.
BZX38450-B3V3-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.3 V
- Tolerance:
- ±2%
- Power - Max:
- 300 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:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B3V3-QX FAQ
1.How can I place an order for BZX38450-B3V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B3V3-QX 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 BZX38450-B3V3-QX reliable?
The price and inventory of BZX38450-B3V3-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B3V3-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B3V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B3V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B3V3-QX?
BZX38450-B3V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B3V3-QX 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 BZX38450-B3V3-QX?
For technical support, including BZX38450-B3V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B3V3-QX requirements.
6.How does Aetrix verify that BZX38450-B3V3-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B3V3-QX 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 BZX38450-B3V3-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B3V3-QX?
All BZX38450-B3V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B3V3-QX, 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 BZX38450-B3V3-QX part is unused and in its original packaging.
Return procedure for BZX38450-B3V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B3V3-QX 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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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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BZT52C3V6LP-7
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