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Nexperia USA Inc. BZX384-B68Z
- Part No.:
- BZX384-B68Z
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B68Z.pdf
- Description:
- DIODE ZENER 68V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:29,132
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Product details
Overview
BZX384-B68Z from Nexperia is a ±2 % tolerance Zener voltage regulator diode in SOD323 (SC-76) package, rated for 68 V nominal breakdown voltage at 5 mA, 300 mW total power dissipation, and 40 W non-repetitive peak reverse power. It serves as a precision reference or overvoltage clamp in low-power analog supply rails and sensor interface circuits.
For engineers reviewing the BZX384-B68Z datasheet, BZX384-B68Z pinout, BZX384-B68Z application, or BZX384-B68Z equivalent, this page delivers verified electrical parameters, thermal resistance values, differential resistance (≤475 Ω), temperature coefficient (+47.6 mV/K), and real-world use context for stable 68 V regulation in space-constrained PCB designs.
Technical Context
This Zener diode operates in reverse-biased breakdown mode with a specified 68 V working voltage at IZ = 5 mA, exhibiting a positive temperature coefficient of +47.6 mV/K - indicating voltage increases with junction temperature. Its differential resistance is ≤475 Ω, ensuring stable regulation under small-signal load variations.
Designed for surface-mount operation on FR4 PCBs with single-sided copper, it delivers 300 mW continuous dissipation at Tamb ≤ 25 °C and withstands 40 W non-repetitive surges (tp = 100 μs). Thermal resistance from junction to solder point is 110 K/W, enabling reliable thermal coupling to the PCB.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage VZ | 66.6 V to 69.4 V at IZ = 5 mA - defines tight ±2 % tolerance band for accurate voltage reference |
| Total Power Dissipation Ptot | 300 mW at Tamb ≤ 25 °C - sets maximum continuous DC power handling on standard FR4 layout |
| Differential Resistance rdif | ≤475 Ω at IZ = 5 mA - determines output impedance and regulation sensitivity to current changes |
| Temperature Coefficient SZ | +47.6 mV/K at IZ = 5 mA - quantifies voltage drift per degree rise, critical for temperature-stable references |
| Non-repetitive Peak Reverse Power | 40 W for tp = 100 μs - supports transient overvoltage suppression without failure |
| Junction-to-Solder-Point Rth(j-sp) | 110 K/W - enables effective heat transfer from die to PCB copper via cathode tab |
| Reverse Current IR | ≤0.2 μA at VR = 54.4 V - ensures minimal leakage below breakdown threshold |
Pinout & Package
SOD323 (SC-76) plastic surface-mounted package with 2 leads; cathode marked by bar on top surface.
| 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; reverse-bias polarity must be maintained for Zener operation |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % voltage tolerance | Enables tighter regulation than ±5 % variants, reducing need for post-regulation trimming in precision supplies |
| Low-profile SOD323 package | 0.9 mm height and 2.7 × 1.8 mm footprint support high-density layouts in portable and IoT devices |
| 40 W surge capability | Withstands ESD and line transients without degradation, eliminating need for external TVS in many 68 V rail applications |
| 110 K/W junction-to-solder-point Rth | Allows direct thermal path to PCB copper, improving long-term reliability under sustained 300 mW loading |
| Positive temperature coefficient | +47.6 mV/K enables predictable, monotonic voltage shift - useful for temperature-compensated reference designs |
Applications
| Industrial Sensor Signal Conditioning | USB-C PD Auxiliary Voltage Reference |
|---|---|
|
Use Scenario: Stabilizing bias voltage for 4–20 mA transmitter front-end op-amps operating from unregulated 72 V loop supply. IC Role / Device Role / Timing Role: Zener clamping element providing fixed 68 V reference to derive lower internal rails via LDOs. Use Value: Maintains <1 % output variation across –40 °C to +85 °C ambient due to known +47.6 mV/K drift and low rdif. |
Use Scenario: Generating precise 68 V auxiliary supply for USB-C PD controller monitoring circuitry in multi-port chargers. IC Role / Device Role / Timing Role: Primary voltage reference for feedback divider network controlling secondary-side synchronous rectifier gate drive. Use Value: ±2 % tolerance eliminates calibration step during production; 475 Ω rdif ensures <0.5 % load regulation error at 1 mA sink current. |
| Automotive Body Control Module (Non-Automotive Qualified) | Programmable Logic Controller (PLC) Input Protection |
|
Use Scenario: Overvoltage protection for LIN bus transceiver VCC input in aftermarket modules powered from 12 V/24 V battery with load-dump spikes. IC Role / Device Role / Timing Role: Clamp device limiting rail voltage to 68 V during ISO 7637-2 pulse 5a events. Use Value: 40 W non-repetitive surge rating absorbs 100 μs transients without degradation; SOD323 allows placement near connector entry point. |
Use Scenario: Protecting 24 V digital input channels against field-wiring faults and induced surges in industrial control cabinets. IC Role / Device Role / Timing Role: Standoff diode shunting excess energy to ground when input exceeds 68 V threshold. Use Value: 0.2 μA reverse leakage at 54.4 V prevents false triggering; 300 mW Ptot supports continuous fault hold without thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor MMBZ5263B | 68 V nominal, ±5 % tolerance, 350 mW Ptot, SOT-23 package | Higher power but looser tolerance; larger footprint requires more board area | Select when higher surge margin is needed and ±5 % regulation accuracy is acceptable |
| Vishay BZX384-C68 | 68 V nominal, ±5 % tolerance, same SOD323 package and 300 mW rating | Wider voltage spread (64–72 V) reduces precision in reference applications | Choose only for cost-sensitive, non-critical clamping where 68 V ±5 % suffices |
Compared with MMBZ5263B and BZX384-C68, BZX384-B68Z offers superior voltage accuracy (±2 % vs. ±5 %) in the same compact SOD323 footprint, making it optimal for space-constrained designs requiring stable 68 V references without sacrificing precision.
Availability
BZX384-B68Z is available at Aetrix Electronics and suitable for industrial sensor signal conditioning, USB-C PD auxiliary voltage reference, automotive body control module (non-automotive qualified), and PLC input protection requiring stable component supply and consistent parametric performance.
Supply support for BZX384-B68Z 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, headquartered in Nijmegen, Netherlands.
The BZX384 series belongs to Nexperia's precision Zener regulator portfolio, engineered for low-power voltage reference and overvoltage protection in consumer, industrial, and computing applications where SMD miniaturization and parametric consistency are essential.
FAQ
What is the maximum continuous reverse current for BZX384-B68Z?
The maximum continuous forward current is 250 mA, but for Zener operation, the recommended test current is 5 mA. At this current, the device maintains its specified 66.6–69.4 V breakdown range. Continuous operation above 5 mA increases self-heating and shifts VZ per its +47.6 mV/K coefficient; derating is required above 25 °C ambient.
Can BZX384-B68Z be used in automotive applications?
No - BZX384-B68Z is explicitly non-automotive qualified per Nexperia's revision history (Rev. 4, Jan 2023). It lacks AEC-Q200 qualification, automotive-grade screening, and extended temperature validation. For automotive use, Nexperia offers separate -Q qualified variants; this part is intended for industrial, computing, and consumer systems only.
How does the SOD323 package affect thermal performance?
The SOD323 package provides a junction-to-solder-point thermal resistance of 110 K/W, significantly lower than junction-to-ambient (415 K/W). This means effective cooling depends on robust cathode pad copper area and thermal vias. Mounting on 1 oz. FR4 with ≥10 mm² exposed copper reduces steady-state Tj rise by ~50 % compared to minimal footprint layouts.
What is the significance of the 'N8' marking code on BZX384-B68Z?
The 'N8' marking code uniquely identifies BZX384-B68Z per Nexperia's Table 4 - it distinguishes this ±2 %, 68 V variant from A-series (2B–4Z) and C-series (DW–DX) versions. This code is laser-marked on the cathode side and must be verified during incoming inspection to ensure correct tolerance and voltage binning.
BZX384-B68Z 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:
- ±2%
- Power - Max:
- 300 mW
- Impedance (Max) (Zzt):
- 240 Ohms
- Current - Reverse Leakage @ Vr:
- 50 nA @ 47.6 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.1 V @ 100 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOD-323
BZX384-B68Z FAQ
1.How can I place an order for BZX384-B68Z through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B68Z 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-B68Z reliable?
The price and inventory of BZX384-B68Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-B68Z is usually 5 days.
3.What payment methods are accepted for BZX384-B68Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B68Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B68Z?
BZX384-B68Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B68Z 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-B68Z?
For technical support, including BZX384-B68Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B68Z requirements.
6.How does Aetrix verify that BZX384-B68Z is sourced from the original manufacturer or authorized distributors?
All BZX384-B68Z 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-B68Z meets industry standards.
7.What is the process for return or replacement of BZX384-B68Z?
All BZX384-B68Z units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B68Z, 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-B68Z part is unused and in its original packaging.
Return procedure for BZX384-B68Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BZX384-B68Z Tags
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