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Nexperia USA Inc. BZX38450-B15-QX
- Part No.:
- BZX38450-B15-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B15-QX.pdf
- Description:
- DIODE ZENER 15V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:3,910
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Product details
Overview
BZX38450-B15-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 15 V nominal working voltage at 50 µA test current, ±2 % tolerance, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive use.
For engineers reviewing the BZX38450-B15-QX datasheet, BZX38450-B15-QX pinout, BZX38450-B15-QX application, or BZX38450-B15-QX equivalent, this device is selected for precision low-bias regulation in battery-powered sensors, ECU reference rails, and portable instrumentation where leakage control and thermal stability under ambient extremes are critical.
Technical Context
This Zener diode operates in reverse breakdown with a specified VZ of 14.7 V to 15.3 V at IZ = 50 µA, exhibiting a temperature coefficient of +9.2 mV/K and differential resistance of 200 Ω at IZ = 5 mA. Its intentional minor leakage rise improves switching speed and noise reduction per AN90031.
Designed for operation up to 150 °C junction temperature and −55 °C to +150 °C ambient range, it delivers stable regulation under low-current bias while maintaining <1 µA reverse current at VR = 12 V - enabling reliable performance in always-on automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 15 V at IZ = 50 µA - defines precise regulation point for low-power reference circuits |
| Voltage Tolerance | ±2 % - ensures tight output voltage consistency across production lots |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - supports continuous operation on standard FR4 PCB without heatsinking |
| Differential Resistance | 200 Ω at IZ = 5 mA - determines load regulation error under small current variations |
| Temperature Coefficient | +9.2 mV/K - quantifies VZ drift per degree Celsius for thermal design margining |
| Reverse Current | ≤ 0.05 µA at VR = 12 V - enables ultra-low standby power in battery-critical systems |
| Forward Voltage | ≤ 0.9 V at IF = 10 mA - defines conduction loss when used in forward-biased protection paths |
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; marking bar identifies this terminal for correct PCB orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; forms reverse-biased junction for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including high-temp operating life and HBM ESD robustness |
| Low test current specification | Rated at 50 µA - enables stable regulation in micro-power sensor nodes and wake-up circuits |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching transients and broadband noise in feedback paths |
| Thermal resistance | Rth(j-a) = 415 K/W - allows direct thermal modeling on standard single-sided FR4 layouts |
Applications
| Automotive Body Control Module (BCM) | Portable Gas Sensor Interface |
|---|---|
Use Scenario: Stable 15 V reference for LIN bus transceiver bias and microcontroller ADC reference in door module electronics. IC Role / Device Role / Timing Role: Zener voltage regulator providing precision DC reference independent of battery voltage fluctuations (9–16 V). Use Value: Maintains <±0.3 V regulation over −40 °C to +125 °C ambient, ensuring consistent analog measurement accuracy across vehicle lifetime. |
Use Scenario: Low-power voltage clamp for electrochemical gas sensor signal conditioning circuit powered by coin cell. IC Role / Device Role / Timing Role: Reverse-biased Zener regulating bias rail to 15 V while drawing <0.1 µA at 12 V reverse bias. Use Value: Extends battery life beyond 5 years by limiting quiescent current to sub-nanoampere levels during sleep mode. |
| Industrial PLC Input Protection | Medical Wearable Reference Rail |
Use Scenario: Overvoltage clamp protecting 16-bit SAR ADC input against transient surges on 24 V field wiring. IC Role / Device Role / Timing Role: Fast-response Zener shunt limiting input voltage to 15.3 V peak during 1 kV/µs transients. Use Value: Limits clamping energy to <40 W non-repetitive peak, preventing damage to downstream precision op-amps. |
Use Scenario: Precision voltage reference for photoplethysmography (PPG) LED driver in FDA-cleared wearable. IC Role / Device Role / Timing Role: Low-noise Zener supplying stable 15 V to current-source DAC controlling LED intensity. Use Value: Reduces optical output ripple to <0.5 % via optimized leakage profile, meeting IEC 60601-2-57 EMI requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-C15-Q | ±5 % tolerance, higher leakage at low VR, same SOD323 package | Accepts wider output variation; suited for non-critical biasing where cost sensitivity outweighs precision | Select when ±5 % VZ tolerance is acceptable and unit cost reduction is prioritized over thermal stability |
| MMSZ5245B-TP | ±5 % tolerance, 500 mW Ptot, SOD-123 package (larger footprint), no AEC-Q101 qualification | Lacks automotive qualification; higher power rating enables higher current regulation but requires larger PCB area | Choose only for non-automotive industrial designs needing >300 mW dissipation and where AEC compliance is not required |
Compared with BZX38450-B15-QX, the BZX384-C15-Q trades voltage precision for cost efficiency in non-automotive roles, while MMSZ5245B-TP offers higher power handling at the expense of qualification and board space - making the BZX38450-B15-QX optimal for space-constrained, thermally demanding automotive reference designs.
Availability
BZX38450-B15-QX is available at Aetrix Electronics and suitable for automotive electronics, portable medical devices, and industrial sensor modules requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX38450-B15-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 AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, high-stability voltage regulation in automotive ECUs, ADAS subsystems, and battery-constrained IoT endpoints.
FAQ
What is the maximum reverse voltage the BZX38450-B15-QX can withstand before breakdown?
The device exhibits a nominal Zener voltage of 15 V with a guaranteed range of 14.7 V to 15.3 V at 50 µA test current. Its absolute maximum non-repetitive peak reverse voltage is determined by the 40 W surge rating at 100 µs pulse width - corresponding to ~250 V for a 100 µs event, but sustained reverse bias must remain below VZ + 10 % to avoid thermal runaway.
Does the BZX38450-B15-QX require external current limiting in series?
Yes - a series current-limiting resistor is mandatory to restrict Zener current within safe operating limits. For example, at 24 V supply and 15 V regulation, a minimum 4.5 kΩ resistor limits IZ to 2 mA, staying well below the 250 mA absolute maximum forward current and ensuring power dissipation remains ≤300 mW under worst-case ambient conditions.
How does the ±2 % tolerance affect regulation accuracy in a 125 °C environment?
At 125 °C, the temperature coefficient of +9.2 mV/K adds +0.92 V to the nominal 15 V Zener voltage, resulting in ~15.92 V. Combined with ±2 % initial tolerance (±0.3 V), total regulation uncertainty becomes ±0.3 V +0.92 V = +1.22 V / −0.3 V - meaning the actual voltage will fall between 14.7 V and 16.92 V across full temperature and unit-to-unit variation.
Can the BZX38450-B15-QX be used in forward conduction mode?
Yes - its forward voltage is specified ≤0.9 V at 10 mA, making it suitable as a low-drop rectifier or ESD clamp in forward bias. However, its primary design intent and characterization are for reverse-biased Zener operation; forward conduction should only be used in secondary protection roles where current is strictly limited to <100 mA to avoid exceeding Ptot and thermal limits.
BZX38450-B15-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):
- 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:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B15-QX FAQ
1.How can I place an order for BZX38450-B15-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B15-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-B15-QX reliable?
The price and inventory of BZX38450-B15-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-B15-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B15-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B15-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B15-QX?
BZX38450-B15-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B15-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-B15-QX?
For technical support, including BZX38450-B15-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B15-QX requirements.
6.How does Aetrix verify that BZX38450-B15-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B15-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-B15-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B15-QX?
All BZX38450-B15-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B15-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-B15-QX part is unused and in its original packaging.
Return procedure for BZX38450-B15-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B15-QX Tags
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MMBZ5240B-7-F
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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
onsemi
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