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Nexperia USA Inc. BZX384-A43-QX
- Part No.:
- BZX384-A43-QX
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A43-QX.pdf
- Description:
- DIODE ZENER 43V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,975
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Product details
Overview
BZX384-A43-Q from Nexperia is a ±1 % 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-A43-Q datasheet, BZX384-A43-Q pinout, BZX384-A43-Q application, or BZX384-A43-Q equivalent, this part serves as a precision low-power shunt regulator with 0.05 mV/K temperature coefficient, 375 Ω max differential resistance, and 150 μA reverse current at 34.4 V, supporting stable biasing and clamping in space-constrained automotive ECUs and sensor interfaces.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable reference voltage across its terminals under varying load and temperature conditions. It delivers 43 V regulation with ±1 % initial tolerance and exhibits a low temperature coefficient of ±0.05 mV/K at IZ = 2 mA, ensuring minimal drift over -65 °C to +150 °C ambient range.
Designed for surface-mount use on FR4 PCBs, it supports non-repetitive peak reverse power dissipation up to 40 W (100 μs pulse), has thermal resistance Rth(j-a) = 415 K/W, and features cathode-anode polarity clearly marked by a bar on the SOD323 body.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 42.57 V to 43.43 V at IZ = 2 mA - tight ±1 % tolerance enables accurate voltage referencing in feedback loops |
| Differential Resistance rdif | 375 Ω max at IZ = 2 mA - low dynamic impedance ensures stable regulation under small-signal load variations |
| Reverse Current IR | 150 μA max at VR = 34.4 V - low leakage preserves efficiency in standby and low-power modes |
| Temperature Coefficient SZ | ±0.05 mV/K at IZ = 2 mA - minimal drift supports reliable operation across automotive temperature extremes |
| Total Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C - sufficient for low-current biasing and clamping without heatsinking |
| Non-repetitive Peak Power | 40 W (100 μs pulse) - enables transient overvoltage suppression in CAN/LIN bus protection |
| Junction Temperature Range | -65 °C to +150 °C - meets AEC-Q101 requirements for under-hood automotive electronics |
Pinout & Package
The BZX384-A43-Q is housed in a SOD323 (SC-76) plastic surface-mount package measuring 1.8 mm × 1.35 mm × 0.95 mm, with gull-wing leads and cathode identified by a marking bar on the device body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where breakdown occurs; marked by bar on package |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD per JESD22 standards |
| ±1 % voltage tolerance | Enables direct replacement in high-accuracy feedback networks without calibration adjustment |
| SOD323 footprint compatibility | Matches industry-standard 0805-equivalent land pattern (2.2 mm × 1.35 mm), enabling drop-in PCB reuse |
| Low thermal resistance to solder point | Rth(j-sp) = 110 K/W - improves power handling during pulsed transients when mounted on copper pour |
| Stable 43 V reference at 2 mA | Optimized operating point balances regulation accuracy, noise, and power consumption in sensor supply rails |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Providing stable 43 V reference for LIN bus transceiver biasing and microcontroller reset circuitry. IC Role / Device Role / Timing Role: Shunt voltage regulator maintaining precise threshold for brown-out detection and communication line clamping. Use Value: Ensures consistent LIN physical layer behavior across battery voltage fluctuations (9–16 V) and load dump transients. |
Use Scenario: Regulating excitation voltage for 4–20 mA current-loop pressure sensors in factory automation systems. IC Role / Device Role / Timing Role: Precision Zener reference establishing fixed headroom above loop supply for op-amp biasing. Use Value: Maintains sensor linearity and zero-point stability despite ambient temperature shifts from −40 °C to +85 °C. |
| Automotive Infotainment Power Sequencing | Medical Diagnostic Equipment Biasing |
Use Scenario: Clamping auxiliary 43 V rail in display backlight driver ICs during cold-crank events. IC Role / Device Role / Timing Role: Transient voltage suppressor absorbing 40 W surges (100 μs) without degradation. Use Value: Prevents latch-up in TFT-LCD timing controllers during ISO 7637-2 Pulse 4 load-dump conditions. |
Use Scenario: Generating calibrated reference for analog front-end ADCs in portable ultrasound probe signal chains. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference source for 16-bit SAR ADC reference buffers. Use Value: Limits gain error to <0.1 % over full medical operating temperature range due to ±0.05 mV/K coefficient. |
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 (42.1 V–43.9 V), higher rdif (400 Ω), identical package and AEC-Q101 rating | Acceptable where system-level calibration compensates for wider voltage spread | Select for cost-sensitive automotive modules where post-assembly trimming is available |
| MMSZ43T1G | ±5 % tolerance (40.9 V–45.1 V), 500 mW Ptot, SOD-123 package, AEC-Q101 qualified | Higher power handling but larger footprint and looser tolerance limit use in compact, high-accuracy designs | Choose only when board layout allows SOD-123 and system tolerances exceed ±2.5 % |
Compared with BZX384-B43-Q and MMSZ43T1G, the BZX384-A43-Q provides the narrowest voltage tolerance and smallest footprint among AEC-Q101-qualified 43 V Zeners, making it optimal for space-constrained, uncalibrated automotive voltage references requiring <±0.5 % system-level accuracy.
Availability
BZX384-A43-Q is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor signal conditioning, infotainment power sequencing, and medical diagnostic equipment biasing requiring stable component supply with guaranteed long-term continuity.
Supply support for BZX384-A43-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 BZX384-Q series belongs to Nexperia's AEC-Q101-qualified Zener diode product line, engineered specifically for precision voltage regulation and transient suppression in harsh-environment automotive and industrial electronics.
FAQ
What is the maximum continuous reverse current the BZX384-A43-Q can sustain at 25 °C?
The BZX384-A43-Q is not rated for continuous reverse current beyond its specified test condition of IZ = 2 mA. Its absolute maximum forward current is 250 mA, but sustained reverse conduction must remain within the 300 mW power limit - at 43 V, this corresponds to ~7 mA average current. Exceeding this risks thermal runaway and permanent degradation.
Can the BZX384-A43-Q be used in parallel for higher power dissipation?
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. For higher power, use a single higher-rated Zener or an active regulator topology.
How does the 0.05 mV/K temperature coefficient impact performance at 125 °C ambient?
At 125 °C junction temperature, the voltage shift from 25 °C is approximately (125 − 25) × 0.05 mV/K = 5 mV - resulting in a VZ of 43.005 V ±1 %. This 0.012 % drift is negligible for most automotive reference applications and falls well within the ±1 % initial tolerance band.
Is the SOD323 package compatible with standard reflow profiles for lead-free assembly?
Yes - Nexperia specifies compatibility with IPC/JEDEC J-STD-020D reflow profiles. The SOD323 package withstands peak temperatures up to 260 °C for 30 seconds. Recommended solder paste stencil aperture is 0.5 mm × 0.6 mm per pad, with 1.5 mm pitch and 2.2 mm overall length per the official footprint in Figure 12.
BZX384-A43-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:
- ±1%
- 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-A43-QX FAQ
1.How can I place an order for BZX384-A43-QX through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A43-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-A43-QX reliable?
The price and inventory of BZX384-A43-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-A43-QX is usually 5 days.
3.What payment methods are accepted for BZX384-A43-QX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A43-QX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A43-QX?
BZX384-A43-QX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A43-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-A43-QX?
For technical support, including BZX384-A43-QX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A43-QX requirements.
6.How does Aetrix verify that BZX384-A43-QX is sourced from the original manufacturer or authorized distributors?
All BZX384-A43-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-A43-QX meets industry standards.
7.What is the process for return or replacement of BZX384-A43-QX?
All BZX384-A43-QX units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A43-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-A43-QX part is unused and in its original packaging.
Return procedure for BZX384-A43-QX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A43-QX Tags
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