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Nexperia USA Inc. BZX38450-C5V1-QX
- Part No.:
- BZX38450-C5V1-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C5V1-QX.pdf
- Description:
- DIODE ZENER 5.1V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:61
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Product details
Overview
BZX38450-C5V1-Q from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 5.1 V nominal regulation at 50 µA test current, with ±5 % tolerance, 300 mW power dissipation, and AEC-Q101 qualification for automotive use.
For engineers reviewing the BZX38450-C5V1-Q datasheet, BZX38450-C5V1-Q pinout, BZX38450-C5V1-Q application, or BZX38450-C5V1-Q equivalent, this device is selected for precision low-bias voltage reference, battery-powered sensor biasing, and ECU-level signal conditioning where leakage-controlled regulation and thermal stability are critical.
Technical Context
This Zener diode operates in reverse breakdown with a specified 5.1 V nominal working voltage at IZ = 50 µA, exhibiting a temperature coefficient of −2.0 mV/K and differential resistance of 500 Ω at 5 mA. Its intentional minor leakage rise improves switching speed and noise performance per AN90031.
Designed for ambient temperatures from −55 °C to +150 °C and junction temperatures up to 150 °C, it delivers stable regulation under low-current conditions while maintaining 130 pF capacitance at 0 V and <3.7 µA reverse current at 5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 5.1 V at IZ = 50 µA - defines precise regulation point for low-power reference circuits |
| Tolerance | ±5 % - supports cost-optimized designs where tighter tolerance is not required |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - enables operation on standard FR4 PCB without heatsinking |
| Differential Resistance | 500 Ω at IZ = 5 mA - indicates moderate regulation stiffness suitable for signal-level biasing |
| Temperature Coefficient | −2.0 mV/K - ensures predictable, slightly negative drift over temperature for stable DC offsets |
| Reverse Current | ≤3.7 µA at VR = 5 V - enables ultra-low standby power in always-on automotive subsystems |
| Forward Voltage | ≤0.9 V at IF = 10 mA - allows safe forward conduction during transient clamping or polarity protection |
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 |
|---|---|
| Low test current operation | Specified at 50 µA - minimizes quiescent current draw in battery-critical applications like key fobs and tire pressure sensors |
| AEC-Q101 qualification | Qualified for automotive use - meets stress-test requirements for vibration, temperature cycling, and humidity resistance |
| Optimized leakage profile | Intentional minor leakage rise (BZX38450-C series) - reduces switching noise and improves transient response in feedback paths |
| Thermal resistance | Rth(j-a) = 415 K/W - enables reliable operation on single-sided FR4 without thermal vias in space-constrained modules |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 5.1 V reference for LIN transceiver bias and microcontroller I/O level-shifting in door module ECUs. IC Role / Device Role / Timing Role: Zener voltage reference diode establishing fixed DC bias point for analog front-end circuitry. Use Value: Maintains regulation accuracy within ±5 % across −40 °C to +125 °C ambient, ensuring consistent LIN bus voltage margins and ADC reference stability. |
Use Scenario: Biasing thermistor networks and op-amp input stages in smart temperature transmitters deployed in factory automation. IC Role / Device Role / Timing Role: Low-current voltage regulator supplying precision reference to ratiometric sensor interfaces. Use Value: Delivers <3.7 µA reverse leakage at 5 V, minimizing self-heating error in high-impedance bridge configurations and extending battery life in wireless nodes. |
| Portable Medical Wearable Power Management | Automotive Infotainment System ESD Protection |
Use Scenario: Generating clean 5.1 V supply for optical heart-rate sensor ASICs in battery-powered wrist-worn devices. IC Role / Device Role / Timing Role: Low-quiescent Zener regulator enabling ultra-low standby current in always-on physiological monitoring circuits. Use Value: Operates reliably at 50 µA test current with 130 pF capacitance, avoiding signal distortion in high-frequency photodiode amplification paths. |
Use Scenario: Clamping transient voltages on 5 V I²C lines between head unit and display modules during load-dump events. IC Role / Device Role / Timing Role: Fast-switching Zener diode used as secondary overvoltage clamp alongside TVS diodes. Use Value: Leverages optimized leakage profile to reduce ringing and overshoot during fast transients, improving EMC robustness without adding RC filtering. |
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-B5V1-Q | ±2 % tolerance, higher differential resistance (600 Ω), no intentional leakage optimization | Better voltage accuracy but slower transient response and higher noise in sensitive analog paths | Select when absolute regulation precision outweighs switching noise sensitivity |
| MMSZ5231B-TP | Same 5.1 V rating, ±5 % tolerance, 500 mW rating, but not AEC-Q101 qualified | Limited to industrial/commercial use; lacks automotive reliability validation and thermal cycling data | Acceptable for non-automotive prototypes or cost-sensitive consumer designs where qualification is not mandated |
Compared with BZX38450-C5V1-Q, the BZX384-B5V1-Q offers tighter voltage tolerance at the expense of higher impedance and unoptimized leakage, while MMSZ5231B-TP provides identical electrical specs but omits automotive qualification-making the C-series optimal for production-grade automotive signal conditioning where noise, reliability, and thermal stability are jointly critical.
Availability
BZX38450-C5V1-Q is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor transmitters, and portable medical wearables requiring stable component supply with guaranteed AEC-Q101 compliance and long-term lifecycle support.
Supply support for BZX38450-C5V1-Q 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 essential efficiency technologies, delivering high-performance logic, discrete, and MOSFET solutions with emphasis on automotive and industrial reliability.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current, low-noise voltage regulation in harsh-environment automotive electronics and precision sensor interfaces.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The BZX38450-C5V1-Q has a nominal Zener voltage of 5.1 V at 50 µA, with a guaranteed minimum breakdown voltage of 4.85 V and maximum of 5.36 V. It is not rated for sustained reverse voltage above its specified VZ range; operation beyond 5.36 V risks exceeding its 300 mW power limit or triggering uncontrolled avalanche behavior.
Can this diode be used in forward-biased configuration?
Yes - the BZX38450-C5V1-Q exhibits a forward voltage ≤0.9 V at 10 mA, making it suitable for polarity protection or low-drop rectification in auxiliary paths. However, its primary design intent and characterization are for reverse-biased Zener operation; forward conduction capability is secondary and not optimized for continuous high-current use.
How does the "C" suffix differ from "B" in the BZX38450-Q series?
The "C" suffix denotes the ±5 % tolerance variant with intentionally elevated leakage current to improve switching speed and reduce noise, per application note AN90031. In contrast, "B" parts offer ±2 % tolerance and lower leakage but lack the optimized transient response - making "C" variants preferred for dynamic biasing and feedback loops in automotive ECUs.
Is thermal derating required above 25 °C ambient?
Yes - the 300 mW power rating applies only at Tamb ≤ 25 °C on standard FR4 PCB. Above that, power must be linearly derated at 2.4 mW/°C based on Rth(j-a) = 415 K/W. At 85 °C ambient, maximum allowable dissipation drops to approximately 156 mW to maintain Tj ≤ 150 °C.
BZX38450-C5V1-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):
- 5.1 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 60 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 3 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -55°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-C5V1-QX FAQ
1.How can I place an order for BZX38450-C5V1-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C5V1-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-C5V1-QX reliable?
The price and inventory of BZX38450-C5V1-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-C5V1-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-C5V1-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C5V1-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C5V1-QX?
BZX38450-C5V1-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C5V1-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-C5V1-QX?
For technical support, including BZX38450-C5V1-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C5V1-QX requirements.
6.How does Aetrix verify that BZX38450-C5V1-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-C5V1-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-C5V1-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-C5V1-QX?
All BZX38450-C5V1-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C5V1-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-C5V1-QX part is unused and in its original packaging.
Return procedure for BZX38450-C5V1-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C5V1-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
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