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Nexperia USA Inc. BZX38450-C3V9-QX
- Part No.:
- BZX38450-C3V9-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C3V9-QX.pdf
- Description:
- DIODE ZENER 3.9V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:4,050
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Product details
Overview
BZX38450-C3V9-Q from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 3.9 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-C3V9-Q datasheet, BZX38450-C3V9-Q pinout, BZX38450-C3V9-Q application, or BZX38450-C3V9-Q equivalent, this device serves as a precision low-bias voltage reference in battery-powered sensor nodes, automotive body control modules, and portable instrumentation requiring stable 3.9 V clamping under microampere-level operating currents.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 3.70 V to 4.10 V at IZ = 50 µA, exhibiting a temperature coefficient of −2.7 mV/K and differential resistance of ≤95 Ω at IZ = 5 mA. Its low leakage current and intentional minor rise in IR support fast switching and noise reduction per AN90031.
Designed for surface-mount assembly on FR4 PCBs with single-sided copper, it delivers thermal resistance of 415 K/W (junction-to-ambient) and 110 K/W (junction-to-solder point), enabling reliable operation across −55 °C to +150 °C ambient range while maintaining 150 °C maximum junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 3.9 V at IZ = 50 µA - defines precise regulation point for low-power biasing |
| Voltage Tolerance | ±5 % - ensures consistent clamping across production lots without trimming |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - supports continuous operation in compact SOD323 footprint |
| Differential Resistance | ≤95 Ω at IZ = 5 mA - maintains tight voltage regulation under moderate load variation |
| Forward Voltage | ≤0.9 V at IF = 10 mA - enables predictable forward conduction during transient overvoltage events |
| Reverse Leakage | ≤2.0 µA at VR = 3.0 V - minimizes quiescent current in always-on monitoring circuits |
| Capacitance | 150 pF at VR = 0 V, f = 1 MHz - limits high-frequency signal coupling in noise-sensitive analog paths |
Pinout & Package
Package: SOD323 (SC-76), plastic surface-mounted device, 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; completes reverse-bias path for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| Low test current specification | Rated at 50 µA - enables accurate regulation in ultra-low-power systems such as coin-cell IoT sensors |
| AEC-Q101 qualification | Qualified for automotive applications - meets stress-test requirements for under-hood and chassis-mounted electronics |
| Optimized leakage profile | Intentional minor IR rise per AN90031 - reduces switching noise and improves transient response in feedback loops |
| Thermal performance | Rth(j-a) = 415 K/W - allows direct mounting on standard FR4 without thermal pads in space-constrained layouts |
Applications
| Automotive Body Control Unit | Portable Gas Sensor Interface |
|---|---|
Use Scenario: Voltage reference for ADC input scaling in door module microcontrollers. IC Role / Device Role / Timing Role: Zener regulator providing stable 3.9 V reference to 12-bit SAR ADC during sleep/wake transitions. Use Value: Maintains <±0.2% reference accuracy across −40 °C to +105 °C, ensuring consistent gas concentration readings without calibration drift. |
Use Scenario: Bias supply for electrochemical gas sensor electrodes in handheld air quality monitors. IC Role / Device Role / Timing Role: Low-current Zener clamp establishing precise 3.9 V bias on working electrode. Use Value: Delivers <2 µA leakage at 3.0 V reverse bias, extending CR2032 battery life beyond 18 months in intermittent-read mode. |
| Industrial Temperature Transmitter | Medical Wearable Power Monitor |
Use Scenario: Reference source for 4–20 mA loop transmitter IC in HVAC field devices. IC Role / Device Role / Timing Role: Precision shunt regulator stabilizing internal bandgap reference against supply ripple. Use Value: Achieves <95 Ω dynamic impedance at 5 mA, suppressing 50/60 Hz line-induced error in analog output stage. |
Use Scenario: Overvoltage protection and voltage level setting for LiPo battery fuel gauge IC. IC Role / Device Role / Timing Role: Clamping diode limiting VREF input to 3.9 V during charging transients. Use Value: Withstands 40 W non-repetitive surge (100 µs), preventing latch-up in fuel gauge during hot-plug events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B3V9 | Same 3.9 V nominal, ±2 % tolerance, higher rdiff (≤100 Ω), no AEC-Q101 qualification | Lacks automotive qualification; suitable only for industrial/commercial grade designs | Select when tighter voltage tolerance is required and automotive compliance is not mandated |
| MMSZ4685T1G | 3.9 V nominal, ±5 %, 500 mW Ptot, SOD-123 package, higher thermal resistance (500 K/W) | Higher power handling but larger footprint and inferior thermal performance on FR4 | Choose when board layout allows larger package and >300 mW dissipation is needed |
Compared with BZX38450-C3V9-Q, BZX384-B3V9 offers tighter tolerance but lacks automotive qualification, while MMSZ4685T1G provides higher power rating at the cost of thermal efficiency and board area - making the C-series optimal for space-constrained, AEC-Q101-compliant low-bias applications.
Availability
BZX38450-C3V9-Q is available at Aetrix Electronics and suitable for automotive body control units, portable gas sensor interfaces, and industrial temperature transmitters requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX38450-C3V9-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 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 automotive and portable electronics where precision, low leakage, and thermal robustness are critical.
FAQ
What is the maximum reverse voltage before breakdown for BZX38450-C3V9-Q?
The device exhibits a nominal Zener voltage of 3.9 V at 50 µA test current, with guaranteed minimum and maximum values of 3.70 V and 4.10 V respectively. Breakdown occurs within this range under specified conditions; operation above 4.10 V risks exceeding absolute maximum ratings and is not recommended.
Can BZX38450-C3V9-Q be used in forward conduction mode?
Yes - its forward voltage is specified at ≤0.9 V at 10 mA, making it usable as a low-drop rectifier or ESD clamp in forward bias. However, its primary design intent and characterization are for reverse-bias Zener regulation; forward-mode applications should verify thermal limits using Rth(j-a) = 415 K/W.
How does the "C" suffix differ from "B" in the BZX38450-Q series?
The "C" suffix denotes ±5 % voltage tolerance and incorporates an intentional minor rise in reverse leakage current optimized for fast switching and noise reduction per application note AN90031. The "B" suffix indicates ±2 % tolerance and standard leakage behavior, with no intentional IR enhancement.
Is the SOD323 package compatible with standard reflow soldering profiles?
Yes - Nexperia provides validated reflow soldering footprints for SOD323 in Figure 10, specifying 0.5 mm solder land width, 0.6 mm solder resist opening, and 1.5 mm transport direction clearance. Peak temperatures up to 260 °C are supported per JEDEC J-STD-020.
BZX38450-C3V9-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):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 95 Ohms
- Current - Reverse Leakage @ Vr:
- 5 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-C3V9-QX FAQ
1.How can I place an order for BZX38450-C3V9-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C3V9-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-C3V9-QX reliable?
The price and inventory of BZX38450-C3V9-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-C3V9-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-C3V9-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C3V9-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C3V9-QX?
BZX38450-C3V9-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C3V9-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-C3V9-QX?
For technical support, including BZX38450-C3V9-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C3V9-QX requirements.
6.How does Aetrix verify that BZX38450-C3V9-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-C3V9-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-C3V9-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-C3V9-QX?
All BZX38450-C3V9-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C3V9-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-C3V9-QX part is unused and in its original packaging.
Return procedure for BZX38450-C3V9-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C3V9-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
Diodes Incorporated
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