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Nexperia USA Inc. BZX38450-C4V3-QF
- Part No.:
- BZX38450-C4V3-QF
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C4V3-QF.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,473
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Product details
Overview
BZX38450-C4V3-QF from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 4.3 V nominal Zener voltage at 50 µA test current, ±5 % tolerance, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive use - deployed in precision biasing and low-power voltage reference circuits.
For engineers reviewing the BZX38450-C4V3-QF datasheet, BZX38450-C4V3-QF pinout, BZX38450-C4V3-QF application, or BZX38450-C4V3-QF equivalent, key selection criteria include low-test-current regulation stability, thermal resistance (Rth(j-a) = 415 K/W), cathode-anode polarity marking, and automotive-grade reliability under −55 °C to +150 °C ambient operation.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable reverse-biased breakdown at 4.3 V with differential resistance ≤95 Ω at IZ = 5 mA and temperature coefficient of −2.7 mV/K. It exhibits low leakage (≤4.0 µA at VR = 4.3 V) and capacitance of 150 pF at 0 V.
Designed for low-bias applications, it delivers specified regulation at just 50 µA test current - enabling ultra-low quiescent current operation in battery-powered sensor nodes and automotive microcontroller reset circuits where standby power budget is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 4.09 V to 4.52 V at IZ = 50 µA - ensures tight regulation window for 3.3 V/5 V rail monitoring without external amplification |
| Tolerance | ±5 % - supports cost-optimized designs where moderate voltage accuracy suffices, e.g., non-critical bias references |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - enables operation on standard FR4 PCB without heatsinking in space-constrained modules |
| Differential Resistance (rdiff) | ≤95 Ω at IZ = 5 mA - limits output voltage shift under load variation, critical for stable analog sensor excitation |
| Reverse Leakage (IR) | ≤4.0 µA at VR = 4.3 V - minimizes standby current drain in always-on automotive subsystems |
| Thermal Resistance (Rth(j-a)) | 415 K/W - defines junction-to-ambient rise per watt; constrains max continuous power in sealed enclosures |
| Operating Temperature | −55 °C to +150 °C - validated for under-hood automotive environments per AEC-Q101 stress testing |
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 - reverse-biased during regulation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt path for excess current during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| Low test current specification | Regulation defined at 50 µA - enables use in nanoampere-bias circuits like CMOS oscillator references and low-leakage comparators |
| AEC-Q101 qualification | Stress-tested per automotive discrete semiconductor standard - supports deployment in engine control units and ADAS power domains |
| Optimized leakage profile | Intentional minor leakage rise per AN90031 - improves switching speed and reduces noise in transient-sensitive signal conditioning paths |
| Small-footprint SMD package | SOD323 footprint compatible with high-density PCB layouts - reduces board area vs. DO-35 or SOD123 alternatives |
Applications
| Automotive Microcontroller Reset Circuit | Portable Gas Sensor Bias Supply |
|---|---|
|
Use Scenario: Providing stable 4.3 V reference to monitor 5 V system rail and assert reset when voltage drops below threshold. IC Role / Device Role / Timing Role: Shunt regulator acting as precision voltage threshold detector in conjunction with comparator or supervisor IC. Use Value: Enables reliable cold-cranking detection down to −40 °C with <4 µA leakage, preserving battery life in parked vehicles. |
Use Scenario: Supplying calibrated bias voltage to electrochemical gas sensing elements in handheld air quality monitors. IC Role / Device Role / Timing Role: Low-drift Zener reference establishing fixed excitation potential for sensor electrode polarization. Use Value: Maintains ±5 % regulation across 0–60 °C with <150 pF capacitance, minimizing sensor response time distortion. |
| Industrial PLC Input Protection Clamp | USB-C Power Negotiation Reference |
|
Use Scenario: Clamping transient overvoltages on 4–20 mA analog input channels in programmable logic controllers. IC Role / Device Role / Timing Role: Fast-response shunt limiter absorbing ESD and surge energy before reaching downstream ADC front-end. Use Value: With 40 W non-repetitive peak power rating (tp = 100 µs), absorbs IEC 61000-4-2 Level 4 surges without degradation. |
Use Scenario: Generating accurate 4.3 V reference for USB PD sink-side voltage negotiation logic in portable chargers. IC Role / Device Role / Timing Role: Stable voltage source feeding ADC input of PD controller to verify VBUS presence and negotiate PDO selection. Use Value: Delivers <95 Ω dynamic impedance at 5 mA, ensuring <10 mV error in 12-bit ADC measurement under varying load conditions. |
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-B4V3 | Same Zener voltage (4.3 V), ±2 % tolerance, higher rdiff (120 Ω), no AEC-Q101 qualification | Targeted at commercial-grade consumer electronics, not automotive systems | Select when tighter voltage tolerance is required and automotive qualification is unnecessary |
| MMSZ4V3T1G | 4.3 V nominal, ±5 %, 500 mW Ptot, SOD-123 package (larger footprint), Rth(j-a) = 350 K/W | Higher power handling but less suitable for ultra-dense layouts; lacks intentional leakage optimization | Choose when >300 mW derating margin is needed or legacy SOD-123 footprint compatibility is mandatory |
Compared with BZX38450-C4V3-QF, BZX384-B4V3 offers tighter tolerance but sacrifices automotive qualification and low-leakage performance, while MMSZ4V3T1G trades package size and thermal efficiency for higher absolute power rating - making the QF variant optimal for AEC-Q101-compliant, space-constrained, low-quiescent designs.
Availability
BZX38450-C4V3-QF is available at Aetrix Electronics and suitable for automotive ECUs, portable medical sensors, industrial analog I/O modules, and USB-C power delivery subsystems requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX38450-C4V3-QF 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 optimized for automotive, industrial, and mobile markets.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode portfolio, engineered specifically for low-current, low-noise voltage reference and clamping in harsh-environment automotive electronics.
FAQ
What is the maximum reverse voltage this diode can withstand continuously?
The BZX38450-C4V3-QF has a nominal Zener voltage of 4.3 V and is not rated for continuous reverse voltage beyond its breakdown specification. Its absolute maximum reverse voltage is limited by the 300 mW power dissipation ceiling - at 4.3 V, this corresponds to a maximum continuous reverse current of approximately 70 mA. Exceeding this causes thermal runaway.
Does the "QF" suffix indicate a specific packaging or testing variant?
Yes - the "QF" suffix denotes Nexperia's automotive-grade qualification variant: devices are 100 % tested per AEC-Q101 requirements, including HTGB, AC/DC life test, and temperature cycling, and are supplied in dry-packed moisture-sensitive packaging compliant with J-STD-020 Level 1.
Can this Zener be used in forward-bias mode as a regular diode?
Yes - its forward voltage is specified at 0.9 V @ 10 mA, matching typical silicon diode behavior. However, it is not optimized for forward conduction: no guaranteed IF surge rating or soft recovery characteristics are provided, so dedicated rectifier or switching diodes are preferred for that role.
How does the "C" in BZX38450-C4V3-QF differ from "B" variants?
The "C" denotes the ±5 % tolerance grade and incorporates an intentional minor rise in leakage current per AN90031 - optimizing switching speed and reducing noise in dynamic regulation scenarios. "B" variants offer ±2 % tolerance but lack this leakage tuning and are not recommended for fast-transient applications.
BZX38450-C4V3-QF 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:
- ±5%
- 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:
- -55°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-C4V3-QF FAQ
1.How can I place an order for BZX38450-C4V3-QF through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C4V3-QF 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-C4V3-QF reliable?
The price and inventory of BZX38450-C4V3-QF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX38450-C4V3-QF is usually 5 days.
3.What payment methods are accepted for BZX38450-C4V3-QF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C4V3-QF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C4V3-QF?
BZX38450-C4V3-QF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C4V3-QF 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-C4V3-QF?
For technical support, including BZX38450-C4V3-QF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C4V3-QF requirements.
6.How does Aetrix verify that BZX38450-C4V3-QF is sourced from the original manufacturer or authorized distributors?
All BZX38450-C4V3-QF 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-C4V3-QF meets industry standards.
7.What is the process for return or replacement of BZX38450-C4V3-QF?
All BZX38450-C4V3-QF units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C4V3-QF, 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-C4V3-QF part is unused and in its original packaging.
Return procedure for BZX38450-C4V3-QF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C4V3-QF 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
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SMAZ12-13-F
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