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Nexperia USA Inc. BZX384-C43-QX
- Part No.:
- BZX384-C43-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-C43-QX.pdf
- Description:
- DIODE ZENER 43V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,238
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Product details
Overview
BZX384-C43-Q from Nexperia is a ±5 % 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-C43-Q datasheet, BZX384-C43-Q pinout, BZX384-C43-Q application, or BZX384-C43-Q equivalent, this device serves as a precision low-power shunt regulator in ECU power rails, sensor biasing networks, and ADC reference stabilization where ±5 % tolerance and 40 W surge capability are acceptable trade-offs for compact size and automotive qualification.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a specified 43 V working voltage at IZ = 2 mA, exhibiting a temperature coefficient of +0.05 mV/K and differential resistance ≤375 Ω. Its non-repetitive peak reverse current is 0.6 A under 100 μs pulses.
The device features a cathode-anode two-terminal structure, marked with "DR" on the SOD323 body, and is designed for surface-mount reflow soldering on FR4 PCBs with single-sided copper. Junction-to-ambient thermal resistance is 415 K/W in free air.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 40.0 V to 46.0 V at IZ = 2 mA - defines regulation window for 12 V–48 V automotive subsystems |
| Tolerance | ±5 % - supports cost-sensitive designs where tighter regulation is not required |
| Total Power Dissipation | 300 mW at Tamb ≤ 25 °C - limits continuous DC current to ~7 mA at 43 V |
| Non-repetitive Peak Power | 40 W - enables transient overvoltage clamping up to 0.6 A for 100 μs surges |
| Reverse Current IR | ≤150 μA at VR = 34.4 V - ensures low leakage in standby bias networks |
| Junction Temperature | −65 °C to +150 °C - meets under-hood automotive thermal requirements |
| AEC-Q101 Qualified | Yes - validated for automotive electronics per stress test standard for discrete semiconductors |
Pinout & Package
SOD323 (SC-76) plastic surface-mounted package: 2.3 mm × 1.35 mm footprint, 0.95 mm height, cathode marked by bar on top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-bias anode reference point |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes shunt regulation path |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q101 compliant - enables use in engine control units, body controllers, and ADAS sensors without additional reliability validation |
| Low-profile packaging | SOD323 outline - fits high-density PCB layouts with 1.15 mm pad pitch and <1 mm height clearance |
| Surge robustness | 40 W non-repetitive peak power - clamps load-dump transients in 12 V systems without failure |
| Stable temperature behavior | +0.05 mV/K tempco at IZ = 2 mA - minimizes drift across −40 °C to +125 °C operating range |
| Low leakage performance | ≤150 μA at 80 % VZ - preserves battery life in always-on vehicle modules |
Applications
| Engine Control Unit (ECU) Reference | Automotive Sensor Biasing |
|---|---|
Use Scenario: Stabilizing 5 V or 3.3 V analog supply rails for microcontroller ADC references in engine management systems. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable bias point for precision analog front-ends. Use Value: ±5 % tolerance and AEC-Q101 qualification ensure functional safety compliance without external trimming components. |
Use Scenario: Supplying calibrated bias current to NTC/PTC temperature sensors in HVAC and battery monitoring modules. IC Role / Device Role / Timing Role: Constant-current source via series resistor + Zener clamp configuration. Use Value: 43 V rating allows operation across wide input ranges (e.g., 9–16 V battery), while 300 mW rating supports sustained bias without thermal derating. |
| Infotainment System Protection | Body Control Module (BCM) Regulation |
Use Scenario: Clamping transients on USB or CAN power lines exposed to load dump or jump-start events. IC Role / Device Role / Timing Role: Overvoltage protector absorbing 100 μs surges up to 40 W. Use Value: 0.6 A IZSM and 415 K/W Rth(j-a) enable reliable single-device transient suppression without TVS arrays. |
Use Scenario: Regulating 5 V logic supply for door module microcontrollers powered from switched 12 V battery rail. IC Role / Device Role / Timing Role: Low-power shunt regulator maintaining stable voltage during cranking dips. Use Value: 150 °C max junction temperature and −65 °C min storage rating support under-dash mounting with no heatsink. |
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-Q | ±2 % tolerance, 300 mW Ptot, same SOD323 package | Higher precision needed for feedback loops in DC-DC converters | Select when tighter voltage stability outweighs cost sensitivity |
| MMSZ43ET1G | ±5 % tolerance, 500 mW Ptot, SOD-123 package (larger footprint) | Higher continuous power handling for industrial 24 V systems | Select when thermal margin >300 mW is required and board space permits larger package |
Compared with BZX384-B43-Q, this part trades precision for cost and automotive qualification; compared with MMSZ43ET1G, it sacrifices power headroom for smaller size and guaranteed AEC-Q101 compliance in constrained automotive layouts.
Availability
BZX384-C43-Q is available at Aetrix Electronics and suitable for automotive ECU design, sensor interface development, and infotainment system protection requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for BZX384-C43-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, discrete, and MOSFET devices, with leadership in automotive-qualified components.
The BZX384-Q series belongs to Nexperia's automotive-grade Zener diode product line, engineered specifically for voltage reference, biasing, and transient protection in harsh-temperature vehicle subsystems.
FAQ
What is the maximum continuous reverse current for BZX384-C43-Q at 25 °C?
The maximum continuous reverse current is derived from its 300 mW power rating and 43 V nominal Zener voltage, yielding approximately 7 mA (300 mW ÷ 43 V). This assumes ambient temperature ≤25 °C and no thermal derating; actual usable current decreases above 25 °C due to Rth(j-a) = 415 K/W.
How is the "DR" marking interpreted on the BZX384-C43-Q package?
"DR" is the manufacturer-specific marking code for BZX384-C43-Q per Nexperia's ordering table, indicating the 43 V ±5 % variant in the C-tolerance series. The cathode is identified by the bar adjacent to pin 1, consistent with all SOD323 Zeners in this family.
Can BZX384-C43-Q replace BZX384-A43-Q in an existing design?
Yes, but only if ±5 % tolerance is acceptable in the target application. BZX384-A43-Q offers ±1 % tolerance (2.43 V spread vs. 3.0 V spread), so substitution may affect regulation accuracy in precision feedback paths. Electrical and mechanical compatibility (same SOD323 package, pinout, and thermal specs) is maintained.
Is BZX384-C43-Q suitable for use in a 48 V mild-hybrid vehicle system?
No - its 43 V nominal breakdown voltage and 46 V maximum VZ are insufficient for reliable clamping or regulation in 48 V nominal systems, where transients exceed 60 V. For such applications, higher-voltage variants like BZX384-C68-Q (64–72 V) or dedicated 48 V TVS devices are required.
BZX384-C43-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:
- ±5%
- 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-C43-QX FAQ
1.How can I place an order for BZX384-C43-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-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 BZX384-C43-QX reliable?
The price and inventory of BZX384-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 BZX384-C43-QX is usually 5 days.
3.What payment methods are accepted for BZX384-C43-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-C43-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-C43-QX?
BZX384-C43-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-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 BZX384-C43-QX?
For technical support, including BZX384-C43-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-C43-QX requirements.
6.How does Aetrix verify that BZX384-C43-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-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 BZX384-C43-QX meets industry standards.
7.What is the process for return or replacement of BZX384-C43-QX?
All BZX384-C43-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-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 BZX384-C43-QX part is unused and in its original packaging.
Return procedure for BZX384-C43-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-C43-QX Tags
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