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Nexperia USA Inc. BZX38450-B5V1-QX
- Part No.:
- BZX38450-B5V1-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B5V1-QX.pdf
- Description:
- DIODE ZENER 5.1V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,990
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Product details
Overview
BZX38450-B5V1-Q from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision voltage reference and regulation at 5.1 V nominal with ±2 % tolerance. It delivers stable regulation at 50 µA test current, supports ≤300 mW power dissipation, and features 5.0 Ω differential resistance at IZ = 5 mA - ideal for battery-powered sensor nodes and automotive microcontroller reset circuits.
For engineers reviewing the BZX38450-B5V1-Q datasheet, BZX38450-B5V1-Q pinout, BZX38450-B5V1-Q application, or BZX38450-B5V1-Q equivalent, key selection criteria include its AEC-Q101 qualification, low-leakage optimized B-series construction, 130 pF capacitance at 0 V, and −2.0 mV/K temperature coefficient - critical for low-power analog sensing and automotive body electronics.
Technical Context
This Zener diode operates in reverse breakdown mode with a nominal working voltage of 5.1 V, specified at IZ = 50 µA to ensure minimal bias current draw. Its differential resistance of 500 Ω at IZ = 50 µA and 60 Ω at IZ = 5 mA enables tight regulation under varying load conditions in low-current signal chains.
The device exhibits a negative temperature coefficient of −2.0 mV/K, ensuring predictable voltage drift over temperature, and integrates an intentional minor leakage current rise per AN90031 to reduce switching noise - a design feature confirmed for B-series variants including BZX38450-B5V1-Q.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 5.1 V ±2 % - precise reference for 5 V rail monitoring and MCU reset thresholding |
| Test Current (IZ) | 50 µA - enables ultra-low standby current operation in battery-critical applications |
| Differential Resistance | 500 Ω @ 50 µA / 60 Ω @ 5 mA - ensures stable regulation across light-to-moderate load variations |
| Temperature Coefficient | −2.0 mV/K - predictable downward voltage drift with rising ambient temperature |
| Reverse Capacitance | 130 pF @ 0 V, 1 MHz - low enough to avoid signal integrity issues in high-frequency sensor interfaces |
| Forward Voltage | 0.9 V @ 10 mA - defines forward conduction behavior during transient overvoltage clamping |
| Power Dissipation | 300 mW @ Tamb ≤ 25 °C - sets thermal derating boundary for PCB layout on FR4 single-sided copper |
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; reverse-biased configuration establishes Zener breakdown |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood and body control module use per stress-test standard |
| Low test current operation | Specified at 50 µA - reduces quiescent current in always-on monitoring circuits |
| B-series leakage optimization | Intentional minor IR increase per AN90031 - improves switching speed and reduces noise in dynamic regulation |
| Small-footprint SOD323 | 1.7 mm × 1.25 mm footprint - enables high-density placement in space-constrained ECUs and wearables |
| Stable ±2 % tolerance | Tighter than standard ±5 % C-series - eliminates post-production trimming in precision reference designs |
Applications
| Automotive Body Control Module | Portable Gas Sensor Interface |
|---|---|
Use Scenario: Voltage reference for ADC input scaling in door module microcontrollers monitoring window lift position and mirror adjustment. IC Role / Device Role / Timing Role: Zener regulator providing stable 5.1 V reference to SAR ADC, replacing larger TL431-based solutions. Use Value: AEC-Q101 qualification and −2.0 mV/K TC enable reliable operation across −40 °C to +125 °C ambient without calibration drift. |
Use Scenario: Biasing circuit for electrochemical CO sensor requiring stable excitation voltage in handheld air quality monitors. IC Role / Device Role / Timing Role: Low-current Zener shunt regulator maintaining 5.1 V supply to sensor heater driver IC. Use Value: 50 µA test current minimizes battery drain in multi-year battery life designs; 130 pF capacitance avoids interference with sensor signal bandwidth. |
| Industrial PLC Input Protection | Medical Wearable Power Monitoring |
Use Scenario: Overvoltage clamp and reference element in 24 V DC digital input stage protecting FPGA I/O banks. IC Role / Device Role / Timing Role: Reverse-biased Zener limiting transient spikes while supplying reference to comparator threshold network. Use Value: 300 mW power rating and 415 K/W junction-to-ambient thermal resistance allow safe energy absorption without heatsinking. |
Use Scenario: Voltage supervisor for lithium coin cell (CR2032) powering ECG front-end ASIC in patch-style cardiac monitors. IC Role / Device Role / Timing Role: Precision 5.1 V Zener establishing undervoltage lockout threshold for system power management. Use Value: ±2 % tolerance ensures consistent wake-up voltage across production lots; SOD323 footprint fits sub-10 mm² wearable PCB real estate. |
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-C5V1-Q | ±5 % tolerance, higher leakage, no intentional leakage optimization | Acceptable where cost sensitivity outweighs precision and noise performance | Select when tighter regulation and low-noise operation are not required |
| MMSZ5231B-7-F | Same 5.1 V nominal, ±5 % tolerance, 500 mW Ptot, SOD-123 package (larger footprint) | Higher power handling but incompatible pin pitch and board area | Choose only if thermal margin >300 mW is mandatory and layout allows SOD-123 rework |
Compared with BZX38450-C5V1-Q, the BZX38450-B5V1-Q offers tighter tolerance and noise-optimized leakage for precision analog; versus MMSZ5231B-7-F, it trades 200 mW extra power headroom for 35 % smaller PCB area and AEC-Q101 compliance.
Availability
BZX38450-B5V1-Q is available at Aetrix Electronics and suitable for automotive body electronics, portable gas sensing, industrial PLC input protection, and medical wearable power monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX38450-B5V1-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 high-volume, high-reliability essential semiconductors - delivering discrete, logic, and MOSFET solutions engineered for automotive, industrial, and consumer applications.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, designed specifically for low-current, low-noise voltage reference and regulation in space- and power-constrained automotive and portable electronics.
FAQ
What is the maximum reverse voltage this Zener can regulate without damage?
The absolute maximum non-repetitive peak reverse power dissipation is 40 W for 100 µs pulses, but continuous operation must stay within 300 mW total power dissipation at ≤25 °C ambient. At 5.1 V, this limits average reverse current to ~59 mA under ideal thermal conditions; derating applies above 25 °C per Rth(j-a) = 415 K/W.
Does the −2.0 mV/K temperature coefficient mean voltage drops as temperature rises?
Yes - the negative temperature coefficient indicates the Zener voltage decreases by approximately 2.0 mV per Kelvin increase in junction temperature. For example, at 100 °C junction temperature (75 K above 25 °C), the regulated voltage drops by ~150 mV from nominal 5.1 V, resulting in ~4.95 V output.
Can this diode be used in forward-bias mode like a standard silicon diode?
Yes - its forward voltage is specified at 0.9 V @ 10 mA, matching typical silicon diode behavior. However, it is not optimized for rectification; forward conduction is primarily relevant for ESD protection paths or fault-mode analysis, not primary circuit function.
How does the "intentional minor rise of leakage current" improve noise performance?
Per AN90031, the controlled increase in reverse leakage current in B-series devices reduces carrier trapping effects during voltage transitions, lowering broadband noise and improving transient response - verified in fast-switching applications like PWM-controlled reference buffers and sensor excitation circuits.
BZX38450-B5V1-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:
- ±2%
- 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:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-B5V1-QX FAQ
1.How can I place an order for BZX38450-B5V1-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B5V1-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-B5V1-QX reliable?
The price and inventory of BZX38450-B5V1-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-B5V1-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B5V1-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B5V1-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B5V1-QX?
BZX38450-B5V1-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B5V1-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-B5V1-QX?
For technical support, including BZX38450-B5V1-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B5V1-QX requirements.
6.How does Aetrix verify that BZX38450-B5V1-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B5V1-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-B5V1-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B5V1-QX?
All BZX38450-B5V1-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B5V1-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-B5V1-QX part is unused and in its original packaging.
Return procedure for BZX38450-B5V1-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B5V1-QX Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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BZT52C15S-7-F
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MM5Z5V1ST1G
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