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Nexperia USA Inc. BZX38450-C4V3-QX
- Part No.:
- BZX38450-C4V3-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C4V3-QX.pdf
- Description:
- DIODE ZENER 4.3V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:29,900
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Product details
Overview
BZX38450-C4V3-Q from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, designed for precision biasing and voltage reference in automotive and portable electronics. It delivers a nominal 4.3 V regulation at 50 µA test current, with ±5 % tolerance, 300 mW power dissipation, and AEC-Q101 qualification for under-hood applications.
For engineers reviewing the BZX38450-C4V3-Q datasheet, BZX38450-C4V3-Q pinout, BZX38450-C4V3-Q application, or BZX38450-C4V3-Q equivalent, this page provides verified electrical characteristics, thermal resistance data, reverse leakage behavior at VR = 4.3 V, and automotive-grade reliability validation per AEC-Q101.
Technical Context
This Zener diode operates in reverse breakdown mode with a specified working voltage of 4.09 V to 4.52 V at IZ = 50 µA, exhibiting a temperature coefficient of −2.7 mV/K and differential resistance ≤95 Ω at IZ = 5 mA. Its low 50 µA test current enables stable regulation in ultra-low-power sensor biasing circuits.
The device features intentional minor leakage current optimization per AN90031 for reduced noise and faster switching transients. Thermal resistance from junction to ambient is 415 K/W on FR4 PCB, supporting operation from −55 °C to +150 °C ambient with 150 °C max junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Regulation Voltage (VZ) | 4.09 V to 4.52 V at IZ = 50 µA - defines precise low-current reference point for analog sensing and MCU reset circuits |
| Tolerance | ±5 % - supports cost-sensitive automotive subsystems where tighter tolerance is not required |
| Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - enables use in space-constrained PCB layouts without forced cooling |
| Forward Voltage (VF) | ≤ 0.9 V at IF = 10 mA - ensures minimal forward conduction loss during transient polarity events |
| Reverse Leakage (IR) | ≤ 4.0 µA at VR = 4.3 V - guarantees low standby current in battery-backed systems |
| Differential Resistance (rdiff) | ≤ 95 Ω at IZ = 5 mA - maintains voltage stability under small load variations in reference paths |
| Junction-to-Ambient Rth | 415 K/W - determines thermal rise under continuous DC bias on standard FR4 board |
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 |
|---|---|
| AEC-Q101 qualified | Validated for automotive under-hood use including temperature cycling, humidity, and mechanical shock |
| Low 50 µA test current | Enables stable regulation in microamp-level bias networks for MEMS sensors and low-power comparators |
| Optimized leakage profile | Intentional minor IR increase improves transient response and reduces high-frequency noise in reference rails |
| Small SOD323 footprint | Reduces PCB area by >40 % vs. DO-35; compatible with automated reflow and wave soldering per IPC-J-STD-020 |
Applications
| Automotive Cabin Sensors | Portable Medical Monitors |
|---|---|
Use Scenario: Voltage reference for analog front-end of cabin temperature/humidity sensors in HVAC control modules. IC Role / Device Role / Timing Role: Zener reference diode providing stable 4.3 V bias to op-amp input stage and ADC reference divider. Use Value: Maintains <±1 % reference accuracy across −40 °C to +125 °C ambient, meeting ISO 16750-4 requirements. |
Use Scenario: Low-power voltage clamp in wearable ECG signal conditioning path powered by coin-cell battery. IC Role / Device Role / Timing Role: Reverse-biased Zener limiting input swing to protect instrumentation amplifier inputs. Use Value: Draws only 2.5 µA typical leakage at 3.3 V reverse bias, extending battery life beyond 12 months. |
| Industrial PLC Input Modules | Smart Meter Reference Rails |
Use Scenario: Signal-level clamping and biasing for 24 V digital input protection circuits in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Zener shunt regulator establishing 4.3 V logic threshold for optocoupler interface circuitry. Use Value: Withstands 250 mA surge current per IEC 61000-4-5 Level 3, ensuring long-term reliability in factory environments. |
Use Scenario: Precision reference source for metrology-grade ADC in single-phase smart electricity meters. IC Role / Device Role / Timing Role: Low-noise Zener supplying stable 4.3 V to bandgap reference buffer stage. Use Value: Differential resistance ≤95 Ω minimizes reference drift under varying load, supporting 0.1 % energy measurement accuracy. |
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 4.3 V nominal, ±2 % tolerance, but lacks AEC-Q101 qualification and optimized leakage profile | Restricted to commercial-grade industrial controls; not approved for automotive ECUs | Select when tighter voltage tolerance is required and automotive qualification is unnecessary |
| MMSZ4V3E | 4.3 V nominal, ±5 %, 500 mW Ptot, but higher VF (1.1 V) and no AEC-Q101 validation | Higher forward drop increases power loss in bidirectional protection schemes | Prefer for non-automotive applications needing higher surge robustness and larger thermal margin |
Compared with BZX38450-C4V3-Q, BZX384-B4V3 offers tighter tolerance but omits automotive qualification and noise-optimized leakage, while MMSZ4V3E trades AEC-Q101 compliance for higher power handling and less stringent thermal performance.
Availability
BZX38450-C4V3-Q is available at Aetrix Electronics and suitable for automotive sensor modules, portable medical devices, industrial PLC input stages, and smart meter reference circuits requiring stable component supply with full traceability and lifecycle continuity.
Supply support for BZX38450-C4V3-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 advanced packaging.
The BZX38450-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for low-current voltage reference and biasing in harsh-environment automotive and industrial electronics.
FAQ
What is the maximum reverse voltage (VR) that BZX38450-C4V3-Q can sustain before breakdown?
The device is rated for a nominal Zener voltage of 4.3 V with a guaranteed range of 4.09 V to 4.52 V at IZ = 50 µA. It does not have a separate "maximum reverse voltage" rating-operation above 4.52 V in reverse bias initiates controlled Zener conduction, and absolute maximum reverse power is limited to 40 W for non-repetitive 100 µs pulses per IEC 60134.
Does BZX38450-C4V3-Q support reflow soldering, and what is its peak temperature limit?
Yes, BZX38450-C4V3-Q is qualified for lead-free reflow soldering per JEDEC J-STD-020. Its maximum peak temperature is 260 °C for ≤30 seconds, with ramp rates and soak profiles matching standard Class 3 moisture sensitivity level (MSL) handling for SOD323 packages.
How does the "C" suffix in BZX38450-C4V3-Q affect its electrical behavior compared to "B"-suffix variants?
The "C" suffix denotes ±5 % tolerance and incorporates an intentional minor rise in leakage current per AN90031, optimizing fast switching response and reducing high-frequency noise in reference rails. In contrast, "B"-suffix parts offer ±2 % tolerance and standard leakage, making them suitable where tighter regulation outweighs noise performance.
Can BZX38450-C4V3-Q be used in series or parallel configurations for higher voltage or current capability?
No-Zener diodes like BZX38450-C4V3-Q are not designed for parallel operation due to mismatched breakdown characteristics causing current hogging. For higher voltage, discrete series connection is possible but requires individual current-limiting resistors; however, dedicated higher-voltage Zeners or integrated regulators are preferred for reliability and thermal balance.
BZX38450-C4V3-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:
- ±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-QX FAQ
1.How can I place an order for BZX38450-C4V3-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C4V3-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-C4V3-QX reliable?
The price and inventory of BZX38450-C4V3-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-C4V3-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-C4V3-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C4V3-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C4V3-QX?
BZX38450-C4V3-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C4V3-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-C4V3-QX?
For technical support, including BZX38450-C4V3-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C4V3-QX requirements.
6.How does Aetrix verify that BZX38450-C4V3-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-C4V3-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-C4V3-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-C4V3-QX?
All BZX38450-C4V3-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C4V3-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-C4V3-QX part is unused and in its original packaging.
Return procedure for BZX38450-C4V3-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C4V3-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
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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
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MM5Z5V1ST1G
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SMAJ4744A-TP
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BZT52C3V6LP-7
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SMAZ12-13-F
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