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Nexperia USA Inc. BZX384-A68X
- Part No.:
- BZX384-A68X
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-A68X.pdf
- Description:
- DIODE ZENER 68V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:5,292
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Product details
Overview
BZX384-A68X from Nexperia is a ±1 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 68 V nominal breakdown voltage at 2 mA, 80 Ω maximum differential resistance, and 300 mW total power dissipation. It provides precision voltage reference and overvoltage protection in low-power analog signal conditioning and power rail stabilization circuits.
For engineers reviewing the BZX384-A68X datasheet, BZX384-A68X pinout, BZX384-A68X application, or BZX384-A68X equivalent, this page delivers verified electrical parameters, thermal behavior, cathode/anode terminal mapping, real-world use cases, and validated alternative parts for design-in flexibility and supply continuity.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse-breakdown characteristics at 68 V, optimized for stable DC voltage regulation under low-current conditions (IZ = 2 mA). Its ±1 % tolerance ensures tight output voltage control in feedback networks and reference circuits.
Designed for surface-mount assembly on FR4 PCBs, it exhibits 110 K/W junction-to-solder-point thermal resistance and supports non-repetitive peak reverse power dissipation up to 40 W for transient suppression. The cathode-marked SOD323 package enables high-density layout while maintaining reliable thermal performance at ambient temperatures from –65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VZ) | 67.32 V to 68.68 V at IZ = 2 mA - defines precise clamping threshold for 68 V nominal regulation |
| Differential Resistance (rdif) | ≤80 Ω at IZ = 2 mA - ensures minimal voltage shift under load current variation |
| Reverse Current (IR) | ≤0.2 μA at VR = 54.4 V - guarantees low leakage in standby or high-impedance bias networks |
| Temperature Coefficient (SZ) | +0.05 mV/K at IZ = 2 mA - indicates near-zero drift across operating temperature range |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C - sets continuous DC power limit for thermal design on standard PCB |
| Non-repetitive Peak Power (PZSM) | 40 W for tp = 100 μs - enables robust surge handling in ESD or inductive kick protection |
| Junction Temperature (Tj) | –65 °C to +150 °C - supports operation in extended industrial environments |
Pinout & Package
SOD323 (SC-76) plastic surface-mounted package with 2 leads; compact 1.35 mm × 0.85 mm footprint and 0.45 mm profile ideal for space-constrained PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; marking bar identifies this terminal for correct polarity orientation |
| 2 | Anode (A) | Connected to ground or lower-potential rail; reverse-biased configuration enables Zener conduction |
Key Features
| Feature | Design Value |
|---|---|
| ±1 % voltage tolerance | Enables accurate 68 V reference without post-production trimming in precision analog circuits |
| Low differential resistance (≤80 Ω) | Maintains regulation stability under ±1 mA load current changes in feedback loops |
| Non-repetitive 40 W surge rating | Protects downstream circuitry from short-duration transients without derating requirements |
| SOD323 package thermal resistance | 110 K/W junction-to-solder-point allows direct thermal coupling to copper pour for passive cooling |
| –65 °C to +150 °C operating range | Supports deployment in unheated outdoor enclosures and high-temperature industrial control modules |
Applications
| Industrial Sensor Signal Conditioning | USB-C Power Delivery Reference |
|---|---|
|
Use Scenario: Stabilizing reference voltage for 16-bit ADC front-end in pressure transducer module. IC Role / Device Role / Timing Role: Zener diode provides fixed 68 V reference for op-amp gain-setting network and ADC input clamp. Use Value: ±1 % tolerance ensures <0.1 LSB error contribution at full-scale; 80 Ω rdif prevents gain drift during sensor excitation current modulation. |
Use Scenario: Overvoltage clamp in USB-C PD sink controller auxiliary power rail (VCONN). IC Role / Device Role / Timing Role: Reverse-biased Zener limits VCONN to 68 V during hot-plug transients or adapter fault conditions. Use Value: 40 W non-repetitive surge rating absorbs 100 μs inductive spikes without degradation; SOD323 footprint fits tight routing near connector. |
| Programmable Logic Controller Input Protection | Automotive Body Control Module Reference |
|
Use Scenario: Protecting 24 V digital input channel against load-dump surges in PLC backplane. IC Role / Device Role / Timing Role: Zener shunts excess energy to ground when input exceeds 68 V, safeguarding optocoupler input stage. Use Value: 150 °C max junction temperature permits operation adjacent to power relays; 0.2 μA IR minimizes quiescent current draw in always-on monitoring circuits. |
Use Scenario: Providing stable 68 V reference for LIN bus transceiver biasing in BCM subassembly. IC Role / Device Role / Timing Role: Regulator diode establishes clean bias point for LIN driver amplifier stage under battery voltage fluctuations. Use Value: +0.05 mV/K temperature coefficient ensures <±0.5 V drift from –40 °C to +125 °C; SOD323 reflow compatibility aligns with automotive PCB assembly standards. |
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-B68 | ±2 % tolerance (66.6 V–69.4 V), higher 150 Ω rdif at IZ = 2 mA | Acceptable where 68 V accuracy <±2 % suffices; less stable under dynamic load | Select for cost-sensitive designs where tighter regulation is not required |
| MMBZ5263BS | 68 V nominal, ±5 % tolerance, SOT-23 package, 500 mW Ptot | Larger footprint and higher power rating; less suitable for ultra-compact layouts | Choose when higher continuous power margin or legacy SOT-23 compatibility is needed |
Compared with BZX384-A68X, BZX384-B68 trades regulation precision for lower unit cost, while MMBZ5263BS offers greater thermal headroom at the expense of board area-making the A68X optimal for space-constrained, high-accuracy 68 V reference needs.
Availability
BZX384-A68X is available at Aetrix Electronics and suitable for industrial sensor interfaces, USB-C power delivery systems, programmable logic controller inputs, and automotive body control modules requiring stable component supply and long-term production continuity.
Supply support for BZX384-A68X 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 delivering high-performance, reliable discrete, logic, and MOSFET devices with focus on efficiency, reliability, and miniaturization.
The BZX384 series belongs to Nexperia's precision Zener regulator portfolio, engineered specifically for low-power voltage reference and overvoltage protection in space-constrained, thermally demanding applications.
FAQ
What is the maximum reverse current (IR) specification for BZX384-A68X at 54.4 V?
The maximum reverse current is 0.2 μA at VR = 54.4 V and Tj = 25 °C, measured per Table 9 of the datasheet. This ultra-low leakage ensures minimal power loss in high-impedance bias networks and preserves accuracy in precision reference applications where current draw must remain below 1 μA.
Can BZX384-A68X be used in place of a 68 V Zener with ±5 % tolerance?
Yes, but only if the system design requires tighter regulation: BZX384-A68X offers ±1 % tolerance (67.32–68.68 V) versus ±5 % (64.6–71.4 V) for C-series parts. Its lower differential resistance (80 Ω vs. ≥475 Ω) also improves load regulation-critical in feedback paths where voltage stability directly impacts loop accuracy.
How does the SOD323 package affect thermal performance compared to larger Zener packages?
The SOD323 package delivers Rth(j-sp) = 110 K/W, enabling efficient heat transfer to the PCB solder joint-superior to TO-236 (SOT-23) at similar power levels. However, its 300 mW Ptot rating assumes FR4 with single-sided copper; doubling copper area reduces Rth(j-a) significantly, making it viable for moderate-duty regulation where board-level thermal design is controlled.
Is BZX384-A68X qualified for automotive applications?
No-this part is non-automotive qualified per Revision History section 13, which explicitly states "Products changed to non-automotive qualification" in Rev. 4. For automotive use, Nexperia offers separate –Q qualified variants (e.g., BZX384-A68-Q); BZX384-A68X is intended for industrial, computing, and consumer applications meeting standard JEDEC reliability requirements.
BZX384-A68X 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):
- 68 V
- Tolerance:
- ±1%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 160 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 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-A68X FAQ
1.How can I place an order for BZX384-A68X through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-A68X 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-A68X reliable?
The price and inventory of BZX384-A68X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-A68X is usually 5 days.
3.What payment methods are accepted for BZX384-A68X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-A68X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-A68X?
BZX384-A68X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-A68X 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-A68X?
For technical support, including BZX384-A68X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-A68X requirements.
6.How does Aetrix verify that BZX384-A68X is sourced from the original manufacturer or authorized distributors?
All BZX384-A68X 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-A68X meets industry standards.
7.What is the process for return or replacement of BZX384-A68X?
All BZX384-A68X units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-A68X, 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-A68X part is unused and in its original packaging.
Return procedure for BZX384-A68X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-A68X Tags
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