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Nexperia USA Inc. BZX38450-B15X
- Part No.:
- BZX38450-B15X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B15X.pdf
- Description:
- DIODE ZENER 15V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,112
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Product details
Overview
BZX38450-B15X 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 15 V regulation at 50 µA test current, with ±2 % tolerance, 300 mW total power dissipation, and 11.4 Ω differential resistance at 5 mA - ideal for battery-powered sensor nodes and portable instrumentation.
For engineers reviewing the BZX38450-B15X datasheet, BZX38450-B15X pinout, BZX38450-B15X application, or BZX38450-B15X equivalent, key selection criteria include its low 50 µA regulation test current, tight ±2 % tolerance, SOD323 footprint compatibility, and specified 11.4 Ω dynamic impedance at 5 mA - critical for stable reference generation under light-load conditions.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining a stable reverse-biased breakdown voltage across its cathode-anode terminals. Its regulation is characterized at IZ = 50 µA (not 5 mA), enabling accurate reference establishment in micro-power designs where quiescent current must remain below 100 µA.
The BZX38450-B15X exhibits a temperature coefficient of +5.4 mV/K and reverse capacitance of 75 pF at 0 V, supporting stable performance in ambient temperatures from −55 °C to +150 °C. Its thermal resistance from junction to ambient is 415 K/W on standard FR4 PCB, limiting continuous power handling to 300 mW at Tamb ≤ 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 15 V at IZ = 50 µA - defines primary regulation point for low-bias reference circuits |
| Tolerance | ±2 % - ensures tight voltage accuracy without post-production trimming |
| Differential Resistance | 11.4 Ω at IZ = 5 mA - determines load regulation error under moderate current variation |
| Forward Voltage | ≤ 0.9 V at IF = 10 mA - enables use as low-drop rectifier or clamp in dual-polarity bias networks |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - sets maximum steady-state power budget on standard FR4 PCB |
| Reverse Capacitance | 75 pF at VR = 0 V, f = 1 MHz - impacts high-frequency noise filtering and stability in RF-adjacent references |
| Junction Temperature Limit | +150 °C - defines maximum operating temperature for reliability in sealed enclosures |
Pinout & Package
Package: SOD323 (SC-76), surface-mounted plastic package; 2 leads; 1.3 mm pitch; 1.7 mm × 1.25 mm × 0.95 mm body. Cathode identified by marking bar.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (K) | Cathode | Connected to regulated output node; reverse-biased terminal during Zener operation |
| 2 (A) | Anode | 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 stable reference generation in sub-100 µA supply rails |
| Tight voltage tolerance | ±2 % - reduces need for external calibration in precision analog front-ends |
| Optimized leakage behavior | Intentional minor rise in IR supports fast switching and reduced noise per AN90031 |
| Thermal robustness | 150 °C max junction temperature - suitable for industrial environments with limited airflow |
| Small-footprint packaging | SOD323 outline - saves board space in dense portable electronics layouts |
Applications
| Portable Sensor Biasing | Low-Power ADC Reference |
|---|---|
|
Use Scenario: Providing stable excitation voltage to MEMS pressure sensors in wireless IoT nodes powered by coin-cell batteries. IC Role / Device Role / Timing Role: Shunt voltage reference establishing fixed 15 V bias for sensor bridge, operating continuously at <100 µA total system current. Use Value: Enables >1-year battery life while maintaining sensor linearity within ±0.5 % full-scale due to ±2 % Zener tolerance and low 50 µA regulation point. |
Use Scenario: Supplying reference voltage to 12-bit SAR ADCs in handheld multimeters with auto-ranging functionality. IC Role / Device Role / Timing Role: Precision shunt regulator generating clean 15 V reference for ADC internal scaling, rejecting supply ripple via low dynamic impedance. Use Value: Achieves effective number of bits (ENOB) ≥11.3 by limiting reference drift to <1.5 mV/°C using +5.4 mV/K temperature coefficient compensation. |
| Microcontroller Reset Circuitry | USB-C Power Negotiation Clamp |
|
Use Scenario: Generating threshold voltage for supervisor IC reset assertion in ultra-low-power MCU sleep modes. IC Role / Device Role / Timing Role: Zener clamping element defining precise 15 V trip point for voltage-monitoring reset generator. Use Value: Guarantees deterministic reset activation across −40 °C to +85 °C with <±30 mV total drift, leveraging known temperature coefficient. |
Use Scenario: Protecting CC line ESD protection diodes in USB-C receptacles from overvoltage during power role swaps. IC Role / Device Role / Timing Role: Low-capacitance (75 pF) shunt clamp limiting CC line voltage to 15 V during transient surges. Use Value: Prevents false PD contract negotiation while maintaining signal integrity up to 3 MHz due to minimal parasitic capacitance. |
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-C15 | ±5 % tolerance vs. ±2 %; identical 15 V nominal, same SOD323 package and 50 µA test current | Acceptable where cost sensitivity outweighs voltage accuracy requirements | Select when reference stability <±75 mV suffices and BOM cost reduction is prioritized |
| MMSZ5245B | 15 V nominal, ±5 % tolerance, 500 mW Ptot, DO-213AC package (SOD-123), higher 17 Ω rdiff | Higher power handling but larger footprint and looser tolerance; not drop-in compatible | Choose only if board redesign allows SOD-123 and system requires >300 mW dissipation margin |
Compared with BZX38450-C15, the BZX38450-B15X offers tighter regulation accuracy essential for precision analog stages; versus MMSZ5245B, it provides superior space efficiency and lower dynamic impedance at the expense of absolute power rating - making it optimal for miniaturized, battery-constrained systems.
Availability
BZX38450-B15X is available at Aetrix Electronics and suitable for portable sensor biasing, low-power ADC reference, microcontroller reset circuitry, and USB-C power negotiation clamp applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for BZX38450-B15X 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 delivering high-performance, reliable discrete, logic, and MOSFET devices optimized for efficiency-critical applications.
The BZX38450 series belongs to Nexperia's precision low-current Zener portfolio, engineered specifically for voltage reference and biasing functions in battery-powered and space-constrained electronics where ultra-low test current and tight tolerance are mandatory.
FAQ
What is the recommended minimum and maximum reverse current for stable regulation of BZX38450-B15X?
The device is specified at IZ = 50 µA for nominal voltage, with stable regulation maintained between 5 µA and 10 mA. Below 5 µA, voltage deviation exceeds ±5 %; above 10 mA, self-heating raises junction temperature beyond safe limits given its 415 K/W thermal resistance.
Can BZX38450-B15X be used in series or parallel configurations for higher voltage or current capability?
No - Zener diodes are not designed for parallel operation due to mismatched breakdown characteristics causing current hogging. Series connection is possible for higher voltage, but requires individual current limiting resistors and derating for cumulative power dissipation and thermal coupling effects.
How does the +5.4 mV/K temperature coefficient affect long-term reference stability in automotive cabin environments?
Over a −40 °C to +105 °C range, the coefficient causes ~780 mV total drift. For applications requiring <±50 mV stability, external compensation (e.g., thermistor network or op-amp correction) is necessary - the diode itself is not automotive-qualified per Nexperia's legal disclaimer.
Is the SOD323 package of BZX38450-B15X compatible with standard reflow profiles for lead-free soldering?
Yes - Nexperia specifies compatibility with IPC/JEDEC J-STD-020D reflow profiles. Peak temperature must not exceed 260 °C for ≤ 30 seconds, with ramp rates ≤ 3 °C/s pre-peak. Figure 10 in the datasheet provides exact solder land dimensions and paste volume guidance.
BZX38450-B15X 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):
- 15 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 30 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 11.4 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-B15X FAQ
1.How can I place an order for BZX38450-B15X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B15X 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-B15X reliable?
The price and inventory of BZX38450-B15X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-B15X is usually 5 days.
3.What payment methods are accepted for BZX38450-B15X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B15X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B15X?
BZX38450-B15X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B15X 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-B15X?
For technical support, including BZX38450-B15X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B15X requirements.
6.How does Aetrix verify that BZX38450-B15X is sourced from the original manufacturer or authorized distributors?
All BZX38450-B15X 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-B15X meets industry standards.
7.What is the process for return or replacement of BZX38450-B15X?
All BZX38450-B15X units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B15X, 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-B15X part is unused and in its original packaging.
Return procedure for BZX38450-B15X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B15X 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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MMSZ5245BS-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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