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Nexperia USA Inc. BZX38450-B4V3-QX
- Part No.:
- BZX38450-B4V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-B4V3-QX.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,553
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Product details
Overview
BZX38450-B4V3-Q from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in low-power circuits. It delivers a nominal 4.3 V regulation at 50 µA test current, with ±2 % tolerance, 95 Ω differential resistance at 5 mA, and −2.7 mV/K temperature coefficient - optimized for portable battery-powered systems requiring stable low-current references.
For engineers reviewing the BZX38450-B4V3-Q datasheet, BZX38450-B4V3-Q pinout, BZX38450-B4V3-Q application, or BZX38450-B4V3-Q equivalent, key selection criteria include its AEC-Q101 qualification, 300 mW power rating, cathode-anode polarity marking, and low-leakage performance at sub-10 µA reverse bias - critical for automotive sensor interfaces and ultra-low-power IoT node regulation.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 4.21 V to 4.39 V at IZ = 50 µA, exhibiting tight ±2 % tolerance (B-series). Its differential resistance remains ≤95 Ω at 5 mA, ensuring minimal voltage shift under load variation, while the negative temperature coefficient (−2.7 mV/K) enables predictable thermal drift compensation in reference designs.
Designed for low-bias operation, it features intentional leakage control per AN90031, enabling fast switching transients and reduced noise in feedback paths. The device is qualified to AEC-Q101 and rated for ambient temperatures from −55 °C to +150 °C, supporting under-hood automotive applications where thermal stability and reliability are mandatory.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 4.3 V at IZ = 50 µA - defines primary regulation point for low-current reference circuits |
| Voltage Tolerance | ±2 % - ensures tight output consistency across production lots without trimming |
| Differential Resistance | ≤95 Ω at IZ = 5 mA - limits regulation error under small load changes |
| Temperature Coefficient | −2.7 mV/K - enables predictable thermal drift for compensated reference designs |
| Forward Voltage | ≤0.9 V at IF = 10 mA - supports reliable forward conduction in protection or clamping roles |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - sets maximum continuous dissipation on standard FR4 PCB |
| Junction Temperature | 150 °C max - defines upper thermal operating limit for automotive under-hood use |
Pinout & Package
Package: SOD323 (SC-76), surface-mounted 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 |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current operation | Specified at 50 µA - enables use in µA-level bias networks without loading error |
| AEC-Q101 qualification | Qualified for automotive applications - guarantees reliability in harsh thermal/vibration environments |
| Optimized leakage profile | Intentional minor rise per AN90031 - improves switching speed and reduces noise in feedback loops |
| Thermal resistance | Rth(j-a) = 415 K/W - informs derating requirements on standard FR4 PCB |
Applications
| Automotive Cabin Sensors | IoT Node Voltage Reference |
|---|---|
Use Scenario: Supplying stable bias to MEMS pressure/temperature sensors in HVAC control modules. IC Role / Device Role / Timing Role: Zener reference providing 4.3 V reference for ADC input scaling and analog front-end biasing. Use Value: ±2 % tolerance and −2.7 mV/K TC ensure <±10 mV total error over −40 °C to +105 °C, meeting ASIL-B sensor accuracy targets. |
Use Scenario: Generating precise low-power reference for nanopower microcontrollers in battery-operated asset trackers. IC Role / Device Role / Timing Role: Low-current Zener regulating supply to internal LDO or directly biasing bandgap circuitry. Use Value: 50 µA test current enables regulation with <1 µA quiescent draw, extending 10-year battery life in BLE/Wi-SUN nodes. |
| Industrial Signal Conditioning | Consumer Audio Biasing |
Use Scenario: Providing reference voltage for 4–20 mA transmitter loop-powered signal conditioning ICs. IC Role / Device Role / Timing Role: Shunt regulator stabilizing internal 4.3 V rail for op-amp and DAC biasing in isolated analog front ends. Use Value: 95 Ω dynamic impedance minimizes output shift under 100 µA load variation, maintaining 0.1 % linearity in current loop output. |
Use Scenario: Setting DC bias point for Class-AB headphone amplifier input stages in portable media players. IC Role / Device Role / Timing Role: Low-noise shunt reference establishing virtual ground and input offset nulling voltage. Use Value: Optimized leakage profile per AN90031 suppresses 1/f noise, reducing audible hiss below −110 dBu in audio signal path. |
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-C4V3-Q | ±5 % tolerance, higher leakage at low VR, identical package and thermal specs | Suitable for non-critical biasing where cost sensitivity outweighs precision | Select when ±5 % regulation accuracy suffices and tighter tolerance adds no system benefit |
| MMSZ4V3T1G | ±5 % tolerance, 500 mW Ptot, SOD-123 package, Rth(j-a) = 350 K/W | Higher power handling but larger footprint and looser tolerance | Choose only if >300 mW dissipation or different board layout constraints require SOD-123 |
Compared with BZX38450-C4V3-Q, the BZX38450-B4V3-Q offers tighter regulation and lower thermal resistance for space-constrained automotive modules; versus MMSZ4V3T1G, it trades power margin for smaller size and AEC-Q101 compliance - making it optimal for high-reliability, miniaturized 4.3 V references.
Availability
BZX38450-B4V3-Q is available at Aetrix Electronics and suitable for automotive cabin sensors, IoT node voltage references, and industrial signal conditioning requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for BZX38450-B4V3-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 specializing in high-performance, 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 voltage regulation in battery-powered and automotive electronics where precision, thermal stability, and long-term reliability are essential.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-B4V3-Q?
The device exhibits a nominal Zener voltage of 4.3 V at 50 µA test current, with guaranteed minimum and maximum values of 4.21 V and 4.39 V respectively. Breakdown occurs within this range under specified conditions; operation above 4.39 V at IZ ≥ 50 µA is not characterized and may exceed limiting values.
Can BZX38450-B4V3-Q be used in series for higher voltage references?
No - the BZX38450-B4V3-Q is not characterized for series operation. Its differential resistance (≤95 Ω) and thermal coupling limitations make stacked configurations prone to current imbalance and thermal runaway. For higher voltages, select a single-device solution like BZX38450-B10-Q or BZX38450-C10-Q.
Is the cathode marking consistent across all BZX38450-Q variants?
Yes - all BZX38450-Q series devices use identical SOD323 packaging with a cathode bar marking on the top surface aligned to Pin 1. The marking code '83' identifies BZX38450-B4V3-Q specifically, but physical polarity orientation remains uniform across the family.
Does the −2.7 mV/K temperature coefficient apply across the full operating range?
Yes - the temperature coefficient of −2.7 mV/K is specified over the full junction temperature range (−55 °C to +150 °C) and is measured at IZ = 5 mA. This value enables accurate prediction of voltage drift in automotive and industrial environments where ambient extremes are encountered.
BZX38450-B4V3-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):
- 4.3 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 4 µA @ 2 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-B4V3-QX FAQ
1.How can I place an order for BZX38450-B4V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-B4V3-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-B4V3-QX reliable?
The price and inventory of BZX38450-B4V3-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-B4V3-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-B4V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-B4V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-B4V3-QX?
BZX38450-B4V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-B4V3-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-B4V3-QX?
For technical support, including BZX38450-B4V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-B4V3-QX requirements.
6.How does Aetrix verify that BZX38450-B4V3-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-B4V3-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-B4V3-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-B4V3-QX?
All BZX38450-B4V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-B4V3-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-B4V3-QX part is unused and in its original packaging.
Return procedure for BZX38450-B4V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-B4V3-QX Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MMSZ4682T1G
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BZT52C15S-7-F
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MM5Z5V1ST1G
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