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Nexperia USA Inc. BZX384-A43X
- Part No.:
- BZX384-A43X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A43X.pdf
- Description:
- DIODE ZENER 43V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:2,438
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Product details
Overview
BZX384-A43X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, providing precise 43 V nominal breakdown voltage at 2 mA test current, with differential resistance ≤375 Ω and reverse current ≤150 μA at 34.4 V, used for low-power voltage reference and overvoltage clamping in power supply feedback loops and sensor signal conditioning circuits.
For engineers reviewing the BZX384-A43X datasheet, BZX384-A43X pinout, BZX384-A43X application, or BZX384-A43X equivalent, this page delivers verified electrical parameters, thermal behavior under PCB mounting conditions, cathode/anode terminal mapping, and direct-fit alternatives for stable 43 V regulation in space-constrained designs.
Technical Context
This device operates as a two-terminal shunt regulator, maintaining stable output voltage by conducting reverse current above its specified Zener voltage (VZ = 42.57–43.43 V at IZ = 2 mA). Its low 300 mW total power dissipation and 415 K/W junction-to-ambient thermal resistance require careful PCB copper area planning for continuous operation.
It exhibits a temperature coefficient of +0.05 mV/K at IZ = 2 mA, indicating minimal drift over temperature, and supports non-repetitive surge handling up to 40 W for 100 μs pulses-critical for transient suppression in DC rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 42.57 V to 43.43 V at IZ = 2 mA - defines tight ±1 % regulation window for precision reference use |
| Differential Resistance (rdif) | ≤375 Ω - limits output voltage variation under load current changes |
| Reverse Current (IR) | ≤150 μA at VR = 34.4 V - ensures low leakage in standby or high-impedance bias networks |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB - sets maximum continuous DC power handling without heatsinking |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - enables short-duration surge clamping without failure |
| Junction Temperature (Tj) | −65 °C to +150 °C - supports industrial ambient operation with derating above 25 °C |
| Package | SOD323 (SC-76) - 1.35 mm × 0.8 mm footprint ideal for high-density PCB layouts |
Pinout & Package
SOD323 (SC-76) surface-mount plastic package with 2 leads; marking bar denotes cathode end; standard footprint per Nexperia Fig. 12 (reflow) and Fig. 13 (wave).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; reverse-biased terminal where Zener breakdown occurs |
| 2 | Anode (A) | Connected to circuit ground or lower-potential rail; completes current path during regulation |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % VZ tolerance | Enables accurate voltage setting without post-production trimming in feedback networks |
| 300 mW power rating | Supports regulation in low-current applications (<10 mA) without external heat sinking |
| Low 150 μA max reverse leakage | Minimizes quiescent current draw in battery-powered or ultra-low-power systems |
| 40 W surge capability | Provides robust ESD and transient immunity when placed across sensitive IC inputs or supply rails |
| SOD323 footprint compatibility | Allows drop-in replacement with other SC-76 diodes and simplifies automated assembly |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp for Microcontroller I/O |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or buck converter feedback loop using optocoupler-coupled TL431 alternative. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise 43 V threshold for error amplifier comparison. Use Value: Tight ±1 % VZ reduces output voltage drift to <±0.43 V, improving system accuracy without calibration. |
Use Scenario: Protecting 3.3 V or 5 V GPIO pins from accidental 48 V field wiring faults in industrial sensors. IC Role / Device Role / Timing Role: Passive clamp limiting input voltage to safe level before reaching MCU protection diodes. Use Value: 40 W non-repetitive surge rating absorbs 100 μs transients without degradation, extending pin lifetime. |
| Temperature-Stable Sensor Biasing | Low-Power Analog Front-End Reference |
Use Scenario: Providing excitation voltage to RTD or bridge sensor in battery-operated environmental monitor. IC Role / Device Role / Timing Role: Low-drift voltage source delivering constant current through sensing element. Use Value: +0.05 mV/K tempco minimizes measurement offset shift over −40 °C to +85 °C operating range. |
Use Scenario: Setting reference point for 12-bit ADC in portable medical device with strict power budget. IC Role / Device Role / Timing Role: Precision DC reference replacing larger SOIC regulators in compact analog section. Use Value: SOD323 size saves >70 % board area vs. DO-35; 150 μA leakage avoids loading weak bias sources. |
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-B43 | ±2 % VZ tolerance (42.1–43.9 V), same SOD323 package and 300 mW rating | Acceptable where 0.8 V wider regulation band is permissible, e.g., non-critical supply monitoring | Select for cost-sensitive designs where ±1 % precision is unnecessary |
| MMSZ43ET1G | ±5 % VZ (40.9–45.1 V), higher 500 mW Ptot, same SOD-123 footprint (not pin-compatible) | Requires PCB redesign; suited for higher-power clamping where thermal margin is critical | Choose only if board layout allows SOD-123 and 500 mW dissipation is required |
Compared with BZX384-A43X, the BZX384-B43 offers identical form factor and power rating but trades precision for cost, while MMSZ43ET1G provides higher power headroom at the expense of footprint change and reduced voltage accuracy-making the A43X optimal for space-constrained, precision-regulated 43 V nodes.
Availability
BZX384-A43X is available at Aetrix Electronics and suitable for industrial power supplies, sensor interface modules, and battery management systems requiring stable component supply with guaranteed long-term sourcing.
Supply support for BZX384-A43X 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 leading semiconductor manufacturer specializing in high-volume logic, analog, and discrete components, with global manufacturing and logistics infrastructure supporting automotive, industrial, and consumer markets.
The BZX384 series belongs to Nexperia's precision Zener diode product line, engineered for reliable voltage regulation in compact, cost-sensitive applications where ±1 % to ±5 % tolerance and SOD323 scalability are essential.
FAQ
What is the maximum continuous reverse current the BZX384-A43X can handle at 43 V?
The device is rated for 300 mW total power dissipation at 25 °C ambient on FR4 PCB. At 43 V, this corresponds to a maximum continuous reverse current of approximately 6.98 mA (300 mW ÷ 43 V). Derating applies above 25 °C per the 415 K/W thermal resistance specification.
Does the BZX384-A43X have automotive qualification?
No. Per Nexperia's Rev. 4 datasheet (January 2023), the BZX384-A43X is explicitly marked as non-automotive qualified. Automotive-grade alternatives are designated with "-Q" suffixes and require separate qualification documentation from Nexperia.
How is the cathode identified on the BZX384-A43X package?
The cathode is marked by a visible bar on the top surface of the SOD323 package, aligned with Pin 1 per Table 2 pinning diagram. This matches the standard SOD323 outline in Figure 11 and reflow footprint in Figure 12.
Can BZX384-A43X replace a 1N4749A in existing designs?
No. The 1N4749A is a 43 V, 1 W through-hole Zener in DO-41 package. While VZ matches, BZX384-A43X has only 300 mW rating and SOD323 footprint-requiring PCB redesign and significant derating. It is not a drop-in replacement for high-power applications.
BZX384-A43X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- BZX384
- 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):
- 80 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-A43X FAQ
1.How can I place an order for BZX384-A43X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A43X 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-A43X reliable?
The price and inventory of BZX384-A43X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-A43X is usually 5 days.
3.What payment methods are accepted for BZX384-A43X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A43X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A43X?
BZX384-A43X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A43X 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-A43X?
For technical support, including BZX384-A43X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A43X requirements.
6.How does Aetrix verify that BZX384-A43X is sourced from the original manufacturer or authorized distributors?
All BZX384-A43X 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-A43X meets industry standards.
7.What is the process for return or replacement of BZX384-A43X?
All BZX384-A43X units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A43X, 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-A43X part is unused and in its original packaging.
Return procedure for BZX384-A43X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A43X Tags
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