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Nexperia USA Inc. BZX38450-B11-QX
- Part No.:
- BZX38450-B11-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B11-QX.pdf
- Description:
- DIODE ZENER 11V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,948
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Product details
Overview
BZX38450-B11-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 11 V nominal regulation at 50 µA test current, with ±2 % tolerance, 300 mW power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-B11-QX datasheet, BZX38450-B11-QX pinout, BZX38450-B11-QX application, or BZX38450-B11-QX equivalent, this part supports precision low-bias voltage reference, ESD-tolerant signal clamping, and battery-powered sensor biasing where leakage and thermal stability are critical selection factors.
Technical Context
This device operates as a two-terminal reverse-biased Zener diode with a specified 11 V working voltage (VZ) at IZ = 50 µA, exhibiting 150 Ω typical differential resistance (rdiff) at IZ = 5 mA and a temperature coefficient of +5.4 mV/K. Its intentional minor leakage rise improves switching speed and noise performance per AN90031.
Designed for low-power regulation, it delivers stable reference behavior under ambient temperatures from −55 °C to +150 °C, with junction-to-ambient thermal resistance of 415 K/W on FR4 PCB and maximum non-repetitive surge power of 40 W for 100 µs pulses.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (nominal) | 11 V at IZ = 50 µA - defines primary regulation point for low-current bias networks |
| Tolerance | ±2 % (B-series) - enables tight reference accuracy without trimming in portable systems |
| Ptot | 300 mW at Tamb ≤ 25 °C - sets maximum continuous power handling on standard FR4 PCB |
| rdiff | 150 Ω max at IZ = 5 mA - determines output impedance and load regulation sensitivity |
| SZ | +5.4 mV/K - quantifies voltage drift over temperature; positive coefficient aids compensation in mixed-sign circuits |
| IR @ VR = 8.8 V | ≤ 0.05 µA - ensures minimal quiescent current draw in always-on battery monitoring paths |
| VF | 0.9 V max at IF = 10 mA - defines forward conduction threshold for bidirectional clamping configurations |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic case measuring 1.7 mm × 1.25 mm × 0.95 mm, with 1.3 mm lead pitch and cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-bias polarity required for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in nanoamp-level bias chains without compromising regulation accuracy |
| AEC-Q101 qualification | Qualified for automotive applications - guarantees reliability under temperature cycling, humidity, and mechanical stress per discrete semiconductor standard |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients and high-frequency noise in feedback paths |
| Thermal robustness | 150 °C max junction temperature - supports operation in engine bay or under-hood modules without derating |
| Small footprint | SOD323 package - saves board space in dense sensor nodes and infotainment subsystems while maintaining solder joint reliability |
Applications
| Automotive Sensor Biasing | Portable Gas Detector Reference |
|---|---|
Use Scenario: Providing stable 11 V bias to MEMS pressure transducers in engine control units. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing fixed reference potential for analog front-end amplification. Use Value: ±2 % tolerance and +5.4 mV/K TC enable <1 % total error across −40 °C to +125 °C operating range without calibration. |
Use Scenario: Supplying regulated excitation voltage to electrochemical CO sensors in handheld safety monitors. IC Role / Device Role / Timing Role: Low-current voltage regulator maintaining constant sensor drive level during battery discharge from 3.6 V to 2.8 V. Use Value: 50 µA test current and 0.05 µA leakage at 8.8 V minimize standby power, extending 2-year battery life. |
| Industrial PLC Input Protection | Medical Wearable Signal Clamping |
Use Scenario: Clamping 0–10 V analog input channels against ESD and overvoltage in programmable logic controllers. IC Role / Device Role / Timing Role: Bidirectional transient suppressor using forward conduction (0.9 V) and reverse Zener action (11 V). Use Value: 40 W non-repetitive surge rating handles IEC 61000-4-2 Level 4 contact discharge without degradation. |
Use Scenario: Protecting ADC inputs of ECG front-ends from electrode pop transients and RF coupling. IC Role / Device Role / Timing Role: Fast-switching Zener clamp limiting signal swing to ±11 V while minimizing added capacitance (85 pF). Use Value: Optimized leakage profile reduces noise floor in sub-μV biopotential measurements without sacrificing response time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C11-Q | ±5 % tolerance, higher leakage at low VR, same VZ and package | Acceptable where cost sensitivity outweighs precision; not recommended for closed-loop biasing | Select when budget constraints dominate and ±5 % regulation error is acceptable in open-loop sensing |
| MMSZ5240B-7-F | 10 V nominal, ±5 %, SOD-123 package, 500 mW Ptot, no AEC-Q101 qualification | Larger footprint, higher power, unqualified for automotive; suitable for industrial mains-powered systems | Choose only for non-automotive designs requiring higher power margin and where 1 V lower VZ is functionally acceptable |
Compared with BZX38450-B11-QX, the BZX384-C11-Q trades accuracy for cost in identical automotive-qualified packaging, while MMSZ5240B-7-F offers higher power but lacks AEC-Q101 validation and uses a less space-efficient package-making the BZX38450-B11-QX optimal for compact, precision, automotive-grade regulation.
Availability
BZX38450-B11-QX is available at Aetrix Electronics and suitable for automotive sensor modules, portable gas detection systems, industrial PLC input stages, and medical wearable signal conditioning requiring stable component supply with AEC-Q101 assurance.
Supply support for BZX38450-B11-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 essential semiconductors, with leadership in logic, discrete, and MOSFET technologies.
The BZX38450-Q series belongs to Nexperia's automotive-qualified Zener diode product line, engineered specifically for low-current, high-stability voltage reference and protection in harsh-environment electronic control units.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-B11-QX?
The device exhibits a nominal 11 V Zener voltage (VZ) at 50 µA test current, with guaranteed minimum and maximum values of 10.80 V and 11.20 V respectively. Breakdown is gradual; full regulation is established above 10.8 V, and the absolute maximum non-repetitive reverse voltage is limited by the 40 W surge rating at 100 µs pulse width-not a fixed DC clamping threshold.
Can BZX38450-B11-QX be used in forward conduction mode?
Yes-it functions as a standard silicon diode in forward bias, with a maximum forward voltage of 0.9 V at 10 mA. This allows dual-use configurations such as bidirectional clamping (e.g., ±11 V protection), though its primary design intent and characterization are for reverse-biased Zener regulation at low currents.
How does the "intentional minor rise of leakage current" affect circuit performance?
Per AN90031, this controlled increase in reverse leakage (e.g., 0.05 µA at 8.8 V) reduces minority-carrier storage time, enabling faster turn-off during transient suppression and lowering high-frequency noise in feedback loops-particularly beneficial in precision analog circuits where conventional Zeners exhibit ringing or overshoot.
Is thermal derating required for operation above 25 °C ambient?
Yes-total power dissipation must be linearly reduced above 25 °C using the junction-to-ambient thermal resistance of 415 K/W. For example, at 85 °C ambient, maximum allowable Ptot drops to approximately 145 mW to maintain Tj ≤ 150 °C, calculated as (150 − 85) °C ÷ 415 K/W = 0.157 W.
BZX38450-B11-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):
- 11 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 20 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 8.4 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-B11-QX FAQ
1.How can I place an order for BZX38450-B11-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B11-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-B11-QX reliable?
The price and inventory of BZX38450-B11-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-B11-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B11-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B11-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B11-QX?
BZX38450-B11-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B11-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-B11-QX?
For technical support, including BZX38450-B11-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B11-QX requirements.
6.How does Aetrix verify that BZX38450-B11-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B11-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-B11-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B11-QX?
All BZX38450-B11-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B11-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-B11-QX part is unused and in its original packaging.
Return procedure for BZX38450-B11-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B11-QX 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
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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