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Nexperia USA Inc. BZX38450-C43-QX
- Part No.:
- BZX38450-C43-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX38450-C43-QX.pdf
- Description:
- DIODE ZENER 43V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:7,406
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Product details
Overview
BZX38450-C43-QX from Nexperia is a low-current Zener voltage regulator diode in SOD323 (SC-76) package, rated for 43 V nominal working voltage at 50 µA test current, ±5 % tolerance, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive use.
For engineers reviewing the BZX38450-C43-QX datasheet, BZX38450-C43-QX pinout, BZX38450-C43-QX application, or BZX38450-C43-QX equivalent, this part serves as a precision low-bias voltage reference in battery-powered sensor nodes, ECU voltage monitoring circuits, and automotive infotainment power rail clamping where leakage current optimization and thermal stability are critical.
Technical Context
This device operates as a two-terminal shunt voltage regulator with cathode-anode polarity, specified at IZ = 50 µA for stable low-current regulation. Its differential resistance is 375 Ω at IZ = 0.5 mA and 150 Ω at IZ = 2 mA, supporting predictable clamping behavior across varying load conditions.
The temperature coefficient is +0.05 mV/K, indicating minimal drift over ambient range (−55 °C to +150 °C), and reverse capacitance is 40 pF at f = 1 MHz and VR = 0 V - enabling effective high-frequency noise suppression in signal conditioning paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Zener Voltage | 43 V at IZ = 50 µA - defines precise regulation point for low-power bias networks |
| Tolerance | ±5 % - supports cost-optimized designs where tighter tolerance is not required |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C - enables operation on standard FR4 PCB without heatsinking |
| Differential Resistance | 375 Ω at IZ = 0.5 mA - ensures stable output under light-load transients |
| Reverse Capacitance | 40 pF at 1 MHz - minimizes signal coupling in RF-adjacent analog circuits |
| Forward Voltage | 0.9 V at IF = 10 mA - defines conduction threshold for protection mode in bidirectional clamp configurations |
| Junction Temperature | 150 °C max - allows deployment in under-hood automotive environments |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic package; 2 leads; 1.3 mm pitch; 1.7 mm × 1.25 mm × 0.95 mm body; cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated voltage node; marking bar identifies this terminal |
| 2 | Anode (A) | Connected to ground or lower-potential reference; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD robustness |
| Optimized leakage profile | Intentional minor rise in IR supports faster switching response and reduced broadband noise in sensing front-ends |
| Low test current specification | Rated at 50 µA - enables use in µA-level standby circuits without compromising regulation accuracy |
| Thermal resistance | Rth(j-sp) = 110 K/W - facilitates direct thermal coupling to PCB copper for passive cooling |
Applications
| Automotive ECU Voltage Monitoring | Portable Gas Sensor Biasing |
|---|---|
Use Scenario: Real-time monitoring of 12 V battery rail in engine control units during cold cranking and load dump events. IC Role / Device Role / Timing Role: Shunt regulator providing stable 43 V reference for ADC input scaling and overvoltage detection circuitry. Use Value: Maintains regulation accuracy despite <100 µA quiescent current draw, preserving microcontroller sleep-mode battery life. |
Use Scenario: Biasing electrochemical gas sensors in handheld air quality monitors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Precision voltage reference for sensor excitation circuit, replacing higher-power LDOs. Use Value: Enables 43 V headroom for sensor signal swing while consuming only 50 µA - extending operational life beyond 2 years on CR2032. |
| Infotainment Power Rail Clamping | Industrial CAN Transceiver Protection |
Use Scenario: Clamping transient spikes on 5 V USB-powered infotainment display logic rails in vehicle dashboards. IC Role / Device Role / Timing Role: Fast-response shunt clamp absorbing ESD and load-dump energy before it reaches downstream logic ICs. Use Value: 40 pF capacitance avoids signal integrity degradation on 24 MHz pixel clock lines while limiting clamped voltage to 43 V ±5 %. |
Use Scenario: Overvoltage protection for CANH/CANL bus lines in industrial gateways exposed to 24 V field wiring faults. IC Role / Device Role / Timing Role: Secondary clamp stage after TVS, fine-tuning clamping level to match transceiver absolute maximum ratings. Use Value: Matches ISO 11898-2 common-mode tolerance (−27 V to +40 V) with 43 V Zener voltage and AEC-Q101 reliability assurance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX38450-B43-Q | ±2 % tolerance (vs. ±5 %); 375 Ω rdiff at IZ = 0.5 mA (same) | Higher precision required in feedback loops of isolated DC-DC converters | Select when regulation accuracy <±2 % is mandatory and cost premium is acceptable |
| MMSZ5257ET1G | 43 V nominal, ±5 %, but rated at IZ = 20 mA; 150 mW Ptot; no AEC-Q101 qualification | Suitable for consumer-grade power supplies, not automotive or high-reliability systems | Choose only for non-automotive, cost-sensitive applications with higher bias current availability |
Compared with BZX38450-B43-Q, this C43-QX offers relaxed tolerance for cost-sensitive automotive modules; versus MMSZ5257ET1G, it delivers AEC-Q101 compliance and low-µA operation essential for modern vehicle electronics with strict power budgets.
Availability
BZX38450-C43-QX is available at Aetrix Electronics and suitable for automotive ECU design, portable sensor systems, and industrial CAN infrastructure requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX38450-C43-QX 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 efficiency-driven, high-volume 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 portfolio, engineered specifically for low-current, high-stability voltage reference and clamping in automotive and portable electronics.
FAQ
What is the maximum reverse voltage this diode can withstand before breakdown?
The nominal Zener voltage is 43 V, with a guaranteed range of 40.85 V to 45.15 V at IZ = 0.5 mA. The absolute maximum non-repetitive peak reverse voltage is limited by PZSM = 40 W for 100 µs pulses, corresponding to ~630 V transient clamping capability under surge conditions.
Does this part require a series resistor in typical regulation applications?
Yes - a current-limiting resistor is mandatory to set IZ within 50 µA to 2 mA range. For 43 V regulation from a 48 V source, a 10 kΩ resistor delivers 500 µA, balancing power dissipation (21.5 mW) and differential resistance (150 Ω) for optimal stability.
How does the "C" suffix differ from "B" in the BZX38450-Q series?
The "C" suffix denotes ±5 % tolerance and an intentional minor rise in leakage current optimized for fast switching and noise reduction per AN90031, whereas "B" indicates ±2 % tolerance and standard leakage characteristics - both share identical package, thermal specs, and AEC-Q101 qualification.
Can this diode be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances; paralleling causes current hogging and thermal runaway. For >300 mW requirements, use a single higher-rated device or active regulation instead.
BZX38450-C43-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- -
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±5%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 32.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX38450-C43-QX FAQ
1.How can I place an order for BZX38450-C43-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX38450-C43-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-C43-QX reliable?
The price and inventory of BZX38450-C43-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-C43-QX is usually 5 days.
3.What payment methods are accepted for BZX38450-C43-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX38450-C43-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX38450-C43-QX?
BZX38450-C43-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX38450-C43-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-C43-QX?
For technical support, including BZX38450-C43-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX38450-C43-QX requirements.
6.How does Aetrix verify that BZX38450-C43-QX is sourced from the original manufacturer or authorized distributors?
All BZX38450-C43-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-C43-QX meets industry standards.
7.What is the process for return or replacement of BZX38450-C43-QX?
All BZX38450-C43-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX38450-C43-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-C43-QX part is unused and in its original packaging.
Return procedure for BZX38450-C43-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX38450-C43-QX Tags
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BZT52C5V6T-7
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MMSZ5231B-7-F
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MMSZ4682T1G
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MM5Z5V1ST1G
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