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Nexperia USA Inc. BZX384-B43-QX
- Part No.:
- BZX384-B43-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B43-QX.pdf
- Description:
- DIODE ZENER 43V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:6,715
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Product details
Overview
BZX384-B43-Q from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 43 V nominal breakdown voltage at 2 mA, 300 mW total power dissipation, and qualified to AEC-Q101 for automotive voltage reference and overvoltage protection circuits.
For engineers reviewing the BZX384-B43-Q datasheet, BZX384-B43-Q pinout, BZX384-B43-Q application, or BZX384-B43-Q equivalent, this part serves as a precision low-power shunt regulator in ECU power rails, sensor biasing networks, and analog front-end clamping where stable 43 V reference and automotive-grade reliability are required.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a specified 43 V working voltage at IZ = 2 mA, differential resistance of 375 Ω max, and temperature coefficient of +0.05 mV/K - indicating near-zero thermal drift across its operating range. It maintains regulation under transient surges up to 40 W (100 μs pulse) and supports continuous operation up to 150 °C junction temperature.
The device uses planar epitaxial silicon construction, features cathode-marked SOD323 packaging optimized for reflow/wave soldering per JEDEC standards, and delivers reverse leakage <150 μA at VR = 34.4 V - enabling accurate clamping in low-current feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage | 43 V nominal at IZ = 2 mA; ±2 % tolerance ensures tight regulation in 43 V reference designs |
| Power Dissipation | 300 mW at Tamb ≤ 25 °C; limits thermal rise in compact PCB layouts without heatsinking |
| Differential Resistance | ≤375 Ω at IZ = 2 mA; defines output impedance and load regulation sensitivity |
| Reverse Leakage | ≤150 μA at VR = 34.4 V; enables low-error biasing in high-impedance analog circuits |
| Peak Pulse Power | 40 W for 100 μs; sustains short-duration transients in automotive load-dump scenarios |
| Junction Temperature | −65 °C to +150 °C; supports under-hood deployment in engine control modules |
| AEC-Q101 Qualified | Validated for automotive discrete semiconductor stress testing; meets qualification requirements for passenger vehicle use |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package: 2-terminal, cathode-bar marked, 2.7 mm × 1.6 mm footprint, 0.9 mm height, optimized for automated assembly on FR4 PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct orientation during placement |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant for use in engine control units, body electronics, and ADAS power domains |
| Tolerance grade | ±2 % (B-series) enables tighter voltage margining than ±5 % C-series in safety-critical references |
| Thermal stability | +0.05 mV/K temperature coefficient minimizes drift over −40 °C to +125 °C ambient range |
| Pulse survivability | Withstands 40 W non-repetitive reverse surges - sufficient for ISO 7637-2 Load Dump waveform clipping |
| Low-leakage design | IR ≤ 150 μA at 80 % VZ allows integration into microamp-level sensor bias networks without error injection |
Applications
| Engine Control Unit (ECU) Reference | Automotive Sensor Biasing |
|---|---|
|
Use Scenario: Providing stable 43 V reference for analog-to-digital converter (ADC) input scaling in diesel ECU power management ICs. IC Role / Device Role / Timing Role: Shunt voltage regulator establishing precise upper rail for ADC full-scale calibration. Use Value: ±2 % tolerance and +0.05 mV/K TC ensure <±0.5 % total error over temperature, meeting ASIL-B functional safety margin requirements. |
Use Scenario: Biasing piezoresistive pressure sensors in brake master cylinder assemblies. IC Role / Device Role / Timing Role: Reverse-biased Zener supplying constant current source via series resistor to sensor bridge. Use Value: Low 150 μA leakage at 34.4 V prevents loading of high-impedance sensor outputs, preserving signal integrity and SNR. |
| Infotainment System Clamping | Body Control Module (BCM) Overvoltage Protection |
|
Use Scenario: Clamping USB-C power delivery negotiation lines against 48 V transients in head unit power sequencing. IC Role / Device Role / Timing Role: Fast-response shunt clamp limiting voltage spikes on communication bus rails. Use Value: 40 W peak pulse rating absorbs ISO 16750-2 Category 5a transients without degradation, maintaining data link integrity. |
Use Scenario: Protecting LIN transceiver supply pins from battery feed overvoltage events in door module PCBs. IC Role / Device Role / Timing Role: Primary overvoltage suppression element diverting excess energy to ground during load dump. Use Value: SOD323 footprint enables placement directly at connector entry point, minimizing trace inductance and improving surge response. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX384-B43 | Same electrical specs but non-AEC-Q101; lacks automotive qualification documentation and stress test records | Restricted to industrial or consumer systems without automotive reliability mandates | Select only if AEC-Q101 compliance is not required and cost sensitivity outweighs long-term field reliability needs |
| MMSZ43ET1G | 43 V, ±5 % tolerance, 500 mW Ptot, SOD-123 package; higher power but looser tolerance and larger footprint | Acceptable in non-space-constrained boards where 5 % tolerance is acceptable and higher surge margin is needed | Choose when board layout allows larger SOD-123 and system tolerances permit ±5 % regulation error |
Compared with BZX384-B43-Q, the BZX384-B43 omits automotive qualification evidence while matching all electrical parameters, whereas MMSZ43ET1G trades tighter tolerance and smaller size for higher power and relaxed accuracy - making the Q-series optimal for space-limited, safety-aware automotive nodes.
Availability
BZX384-B43-Q is available at Aetrix Electronics and suitable for automotive ECU reference design, sensor biasing networks, infotainment clamping circuits, and body control module overvoltage protection requiring stable component supply with full AEC-Q101 traceability.
Supply support for BZX384-B43-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 logic, analog, and discrete components, with leadership in automotive-qualified parts and advanced packaging technologies.
The BZX384-Q series targets automotive voltage regulation applications, delivering AEC-Q101-compliant Zener diodes with tight tolerances, low leakage, and robust surge handling for next-generation vehicle electronics.
FAQ
What is the maximum reverse current the BZX384-B43-Q can sustain continuously?
The device is rated for continuous operation at IZ = 2 mA under normal conditions. Its absolute maximum forward current is 250 mA, but sustained reverse conduction beyond datasheet-specified test conditions risks thermal runaway. For stable regulation, maintain IZ between 0.5 mA and 10 mA per Table 9 characteristics.
Can BZX384-B43-Q be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and manufacturing variations that cause current hogging when paralleled. Even matched units will thermally diverge, leading to premature failure of one device. Use a single higher-power Zener or active regulation instead.
How does the SOD323 package affect thermal performance in high-density layouts?
Rth(j-a) is 415 K/W in free air, but drops to 110 K/W to solder point - meaning thermal relief via copper pour under the cathode pad significantly improves power handling. Without thermal vias or extended copper, derating below 300 mW is required above 70 °C ambient.
Is the 43 V breakdown voltage measured at DC or pulsed conditions?
VZ = 43 V is specified at DC IZ = 2 mA per Table 9. Pulse testing (tp ≤ 100 μs) shows minimal deviation (<0.1 V shift), confirming stable regulation under both steady-state and transient conditions typical in automotive power domains.
BZX384-B43-QX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384-Q
- Package/Case:
- SC-76, SOD-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 43 V
- Tolerance:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 150 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 30.1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-B43-QX FAQ
1.How can I place an order for BZX384-B43-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B43-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 BZX384-B43-QX reliable?
The price and inventory of BZX384-B43-QX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-B43-QX is usually 5 days.
3.What payment methods are accepted for BZX384-B43-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B43-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B43-QX?
BZX384-B43-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B43-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 BZX384-B43-QX?
For technical support, including BZX384-B43-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B43-QX requirements.
6.How does Aetrix verify that BZX384-B43-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-B43-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 BZX384-B43-QX meets industry standards.
7.What is the process for return or replacement of BZX384-B43-QX?
All BZX384-B43-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B43-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 BZX384-B43-QX part is unused and in its original packaging.
Return procedure for BZX384-B43-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B43-QX Tags
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