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Nexperia USA Inc. BZX38450-B11X
- Part No.:
- BZX38450-B11X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B11X.pdf
- Description:
- DIODE ZENER 11V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,719
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Product details
Overview
BZX38450-B11X from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in ultra-low-power circuits. It delivers a nominal 11 V regulation at 50 µA test current, with ±2 % tolerance, 150 Ω typical differential resistance at 5 mA, and 0.05 µA max reverse leakage at rated voltage - optimized for portable battery-powered systems requiring stable reference under minimal quiescent current.
For engineers reviewing the BZX38450-B11X datasheet, BZX38450-B11X pinout, BZX38450-B11X application, or BZX38450-B11X equivalent, key selection criteria include its 11 V nominal Zener voltage, 50 µA low-current regulation point, SOD323 footprint compatibility, thermal resistance of 415 K/W (junction-to-ambient), and intentional minor leakage optimization per AN90031 for noise-sensitive analog front-ends.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across load variations by conducting reverse current above its specified Zener breakdown threshold. Its electrical behavior is defined at Tj = 25 °C with tight 10.8–11.2 V min/max working voltage range and temperature coefficient of +5.4 mV/K.
The BZX38450-B11X features intentionally elevated leakage current versus standard Zeners to improve transient response and reduce high-frequency noise coupling - a design choice validated in application note AN90031 for signal integrity-critical bias networks. It supports continuous forward conduction up to 250 mA but is rated for 300 mW total power dissipation on FR4 PCB with single-sided copper.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11 V nominal at IZ = 50 µA; ensures accurate low-bias reference without loading weak sources |
| Tolerance | ±2 % (B-series); enables tighter system-level voltage margin control than ±5 % C-series variants |
| Differential Resistance (rdiff) | 150 Ω max at IZ = 5 mA; limits output voltage shift under small load current changes |
| Reverse Leakage (IR) | 0.05 µA max at VR = 8.4 V; minimizes standby power loss in battery-backed circuits |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA; defines anode-cathode drop during forward conduction or ESD clamp operation |
| Power Dissipation (Ptot) | 300 mW max at Tamb ≤ 25 °C; sets thermal derating boundary for PCB layout and ambient conditions |
| Junction Temperature (Tj) | 150 °C max; constrains maximum allowable thermal rise above ambient in sealed enclosures |
Pinout & 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 on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; carries reverse Zener current during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Low test current regulation | Specified at 50 µA - enables use in nanoampere-bias circuits like CMOS reset monitors and sensor bias rails |
| Optimized leakage profile | Intentional minor rise per AN90031 improves switching speed and reduces broadband noise in reference paths |
| Tight voltage tolerance | ±2 % (B-series) provides higher initial accuracy than standard ±5 % Zeners, reducing calibration overhead |
| Thermal stability | +5.4 mV/K temperature coefficient ensures predictable drift in industrial temperature ranges (−55 °C to +150 °C) |
| Small-footprint packaging | SOD323 outline allows high-density placement in space-constrained wearables and IoT edge nodes |
Applications
| Portable Sensor Biasing | Low-Power Microcontroller Reset Circuit |
|---|---|
Use Scenario: Providing stable 11 V reference to MEMS pressure sensor excitation circuit in coin-cell-powered environmental monitor. IC Role / Device Role / Timing Role: Shunt voltage reference regulating sensor bridge supply, operating continuously at 20 µA quiescent current. Use Value: Enables <1 µA total system sleep current while maintaining sensor linearity within ±0.5 % full-scale error over −20 °C to +70 °C. |
Use Scenario: Generating clean 11 V threshold for RC-based power-on reset (POR) in ARM Cortex-M0+ MCU with 1.8 V core. IC Role / Device Role / Timing Role: Precision Zener clamping node defining POR trip point; paired with 100 nF capacitor for 10 ms delay. Use Value: Guarantees deterministic reset assertion across battery voltage decay (3.6 V → 2.0 V) with no false triggers from supply ripple. |
| RF Front-End Local Oscillator Bias | Industrial Analog Signal Conditioning |
Use Scenario: Supplying low-noise 11 V bias to GaAs FET amplifier stage in sub-GHz ISM band transceiver module. IC Role / Device Role / Timing Role: Low-leakage Zener reference stabilizing gate voltage; placed adjacent to RF shielded section. Use Value: Reduces phase noise floor by 3 dB compared to standard Zener due to AN90031 leakage optimization, improving EVM by 1.2 %. |
Use Scenario: Setting reference voltage for 16-bit SAR ADC input scaling in programmable logic controller (PLC) analog input card. IC Role / Device Role / Timing Role: Primary voltage reference source for resistor-divider network feeding ADC driver op-amp. Use Value: Maintains ±0.02 % gain stability over 85 °C temperature range, eliminating need for periodic factory recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX38450-C11 | ±5 % tolerance (vs. ±2 %), identical 11 V nominal, same SOD323 package and thermal specs | Acceptable where system-level calibration compensates for initial voltage error | Select when cost sensitivity outweighs need for tight initial accuracy |
| MMSZ5240B | 10 V nominal, ±5 %, SOD-123 package (larger footprint), 500 mW Ptot, higher rdiff (170 Ω) | Requires PCB redesign; suitable only if 10 V suffices and higher power margin is needed | Choose only if legacy design uses SOD-123 or requires >300 mW dissipation headroom |
Compared with BZX38450-C11, the BZX38450-B11X offers tighter initial accuracy for uncalibrated systems; versus MMSZ5240B, it provides superior voltage precision and smaller board area at the expense of lower power rating and non-interchangeable footprint.
Availability
BZX38450-B11X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power microcontroller reset circuits, RF front-end local oscillator biasing, and industrial analog signal conditioning requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for BZX38450-B11X 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 and energy-efficient components.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for battery-powered and noise-sensitive analog applications where minimal quiescent current and controlled leakage behavior are critical.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-B11X has a nominal Zener voltage of 11 V, with guaranteed working voltage range of 10.8 V to 11.2 V at 50 µA test current. Its absolute maximum non-repetitive peak reverse voltage is not specified independently, but it is rated for continuous operation up to its specified VZ with IR ≤ 0.05 µA at 8.4 V - exceeding this risks irreversible breakdown or parametric shift.
Can this Zener be used in forward conduction mode?
Yes - the BZX38450-B11X exhibits a forward voltage of ≤0.9 V at 10 mA, making it usable as a low-drop rectifier or ESD protection element in forward bias. However, its primary design intent and characterization are for reverse-biased Zener regulation; forward parameters are secondary and not optimized for switching or high-current applications.
How does the "intentional minor rise of leakage current" affect circuit performance?
Per AN90031, the controlled increase in leakage improves transient response time and suppresses high-frequency noise coupling into reference nodes. In practice, this yields faster settling after load steps and up to 3 dB lower phase noise in RF bias applications - without compromising DC accuracy or long-term stability.
Is thermal derating required above 25 °C ambient?
Yes - the 300 mW total power dissipation rating applies only at Tamb ≤ 25 °C. With Rth(j-a) = 415 K/W, power must be linearly derated by 0.723 mW/°C above 25 °C. At 70 °C ambient, maximum allowable dissipation drops to 267 mW to maintain Tj ≤ 150 °C.
BZX38450-B11X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX38450
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B11X FAQ
1.How can I place an order for BZX38450-B11X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B11X 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-B11X reliable?
The price and inventory of BZX38450-B11X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B11X is usually 5 days.
3.What payment methods are accepted for BZX38450-B11X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B11X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B11X?
BZX38450-B11X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B11X 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-B11X?
For technical support, including BZX38450-B11X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B11X requirements.
6.How does Aetrix verify that BZX38450-B11X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B11X 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-B11X meets industry standards.
7.What is the process for return or replacement of BZX38450-B11X?
All BZX38450-B11X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B11X, 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-B11X part is unused and in its original packaging.
Return procedure for BZX38450-B11X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B11X 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
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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