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Nexperia USA Inc. BZX384-B68F
- Part No.:
- BZX384-B68F
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Single Zener Diodes
- Package:
- SC-76, SOD-323
- Datasheet:
-
BZX384-B68F.pdf
- Description:
- DIODE ZENER 68V 300MW SOD323
- Quantity:
- Payment:
- Shipping:
Inventory:9,955
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Product details
Overview
BZX384-B68F 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 and power supply feedback circuits.
For engineers reviewing the BZX384-B68F datasheet, BZX384-B68F pinout, BZX384-B68F application, or BZX384-B68F equivalent, key selection criteria include its 68 V Zener voltage with ±2 % tolerance, 80 Ω typical differential resistance at 5 mA, 0.9 V forward voltage at 10 mA, and thermal resistance of 415 K/W junction-to-ambient - critical for stable regulation under varying load and ambient conditions.
Technical Context
This Zener diode operates in reverse-biased breakdown mode to maintain a stable reference voltage across its terminals. Its regulation accuracy relies on tight process control for ±2 % VZ tolerance and low temperature coefficient (±0.05 mV/K) above 6.2 V.
The device uses silicon planar epitaxial construction with cathode-anode polarity defined by a marking bar. It supports pulsed operation up to 40 W (100 μs, square wave) while maintaining 150 °C maximum junction temperature and 64–72 V reverse voltage range at IZ = 5 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 68 V nominal at IZ = 5 mA; actual range 66.6 V to 69.4 V per ±2 % tolerance - defines precise clamping threshold in feedback loops. |
| Differential Resistance (rdif) | 80 Ω max at IZ = 5 mA - determines output impedance and regulation sensitivity to current variation. |
| Forward Voltage (VF) | 0.9 V max at IF = 10 mA - enables predictable forward conduction during transient overvoltage events. |
| Total Power Dissipation (Ptot) | 300 mW at Tamb ≤ 25 °C on FR4 PCB - sets continuous DC power handling limit for thermal design. |
| Non-repetitive Peak Reverse Power | 40 W at tp = 100 μs - supports surge suppression without failure in transient protection applications. |
| Junction-to-Ambient Thermal Resistance | 415 K/W - quantifies self-heating under steady-state bias; requires derating above 25 °C ambient. |
| Reverse Current (IR) | 0.2 μA max at VR = 54.4 V - ensures minimal leakage below breakdown, preserving signal integrity in high-impedance nodes. |
Pinout & Package
Package: SOD323 (SC-76), surface-mount plastic case with 2 leads, 1.35 mm × 0.85 mm footprint, 0.45 mm height, and cathode marked by a bar on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Cathode (K) | Connected to regulated output node; accepts reverse bias for Zener conduction; marking bar identifies this terminal. |
| 2 | Anode (A) | Connected to ground or lower-potential rail; completes reverse-bias path for regulation or clamping function. |
Key Features
| Feature | Design Value |
|---|---|
| ±2 % Zener voltage tolerance | Enables tighter regulation than ±5 % variants, reducing need for post-regulation trimming in precision references. |
| Low differential resistance (80 Ω) | Minimizes output voltage shift under load changes, improving stability in feedback networks. |
| 40 W non-repetitive peak power rating | Allows robust transient suppression without thermal runaway during short-duration surges. |
| SOD323 package (1.35 × 0.85 mm) | Supports high-density PCB layouts in space-constrained consumer and industrial modules. |
| 150 °C maximum junction temperature | Permits reliable operation in elevated ambient environments such as enclosed power supplies or automotive under-hood zones. |
Applications
| Power Supply Feedback Reference | Overvoltage Clamp Circuit |
|---|---|
Use Scenario: Stabilizing output voltage in isolated flyback or buck-boost converters via optocoupler-coupled feedback loop. IC Role / Device Role: Provides fixed 68 V reference to TL431 or similar shunt regulator IC, setting primary-side regulation threshold. Use Value: Tight ±2 % tolerance ensures consistent output voltage across production units without manual calibration. |
Use Scenario: Protecting microcontroller I/O pins or ADC inputs from ESD-induced transients exceeding 60 V. IC Role / Device Role: Acts as passive crowbar element, conducting when reverse voltage exceeds 68 V to divert surge energy. Use Value: 40 W peak power rating absorbs 100 μs surges without degradation, extending system-level ESD immunity. |
| Low-Power Voltage Reference | Current Source Biasing |
Use Scenario: Generating stable bias for op-amp input stages or sensor excitation circuits in battery-powered IoT sensors. IC Role / Device Role: Supplies 68 V reference to resistor-divider network, enabling accurate gain scaling or offset adjustment. Use Value: 0.2 μA reverse leakage at 54.4 V preserves battery life in always-on monitoring systems. |
Use Scenario: Setting constant current for LED driver bias or photodiode transimpedance amplifier compensation. IC Role / Device Role: Forms stable voltage drop across series resistor to establish precise current magnitude. Use Value: 80 Ω differential resistance limits current drift to <±1% over 10 mA load variation, ensuring optical output consistency. |
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, 200 mW Ptot, SOT-23 package | Higher tolerance and lower power rating reduce precision and surge margin in feedback paths | Select when cost sensitivity outweighs regulation accuracy and thermal headroom requirements |
| Vishay BZX384-C68 | 68 V nominal, ±5 % tolerance, same SOD323 package and 300 mW rating | Looser tolerance increases output voltage spread in production, requiring additional system-level calibration | Choose only for non-critical clamping where ±5 % VZ variation is acceptable |
Compared with MMBZ5263B and BZX384-C68, BZX384-B68F delivers superior regulation stability due to its ±2 % tolerance and identical 300 mW power rating - making it optimal for closed-loop feedback and precision reference designs where voltage accuracy directly impacts system performance.
Availability
BZX384-B68F is available at Aetrix Electronics and suitable for power supply feedback reference, overvoltage clamp circuit, and low-power voltage reference applications requiring stable component supply, consistent parametric performance, and long-term manufacturing continuity.
Supply support for BZX384-B68F 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 small-signal diodes, MOSFETs, and ESD protection components.
The BZX384 series belongs to Nexperia's precision Zener regulator portfolio, engineered specifically for compact, low-power voltage reference and clamping functions in consumer, industrial, and communications equipment.
FAQ
What is the maximum continuous reverse current for BZX384-B68F at 25 °C ambient?
The device does not specify a maximum continuous reverse current; instead, it defines maximum power dissipation of 300 mW at Tamb ≤ 25 °C. At 68 V Zener voltage, this corresponds to approximately 4.4 mA average reverse current (IZ = Ptot/VZ). Operation beyond this requires thermal derating per the 415 K/W Rth(j-a) value.
Can BZX384-B68F be used in place of a 68 V Zener with ±1 % tolerance?
No - BZX384-B68F has ±2 % tolerance (66.6 V to 69.4 V), whereas ±1 % variants (e.g., BZX384-A68) offer tighter 67.3 V to 68.7 V range. Substituting BZX384-B68F in ±1 % designs introduces up to 1.4 V additional voltage uncertainty, potentially violating regulation margins in precision feedback systems.
How does the SOD323 package affect soldering process compatibility?
The SOD323 footprint matches standard reflow profiles for lead-free soldering, with recommended land pattern dimensions of 0.5 mm × 1.15 mm pads spaced 1.65 mm center-to-center. Its low thermal mass allows rapid heating but demands precise temperature ramp rates (≤3 °C/s) to avoid tombstoning or voiding during reflow.
Is BZX384-B68F qualified for automotive applications?
No - per Nexperia's revision history (Rev. 4, January 2023), the BZX384 series is explicitly designated as non-automotive qualified. Automotive-grade alternatives (e.g., BZX384-Q series) undergo extended AEC-Q200 testing and are required for under-hood or safety-critical vehicle systems.
BZX384-B68F 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-B68F FAQ
1.How can I place an order for BZX384-B68F through Aetrix?
Please submit a Request for Quotation (RFQ) for BZX384-B68F 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-B68F reliable?
The price and inventory of BZX384-B68F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BZX384-B68F is usually 5 days.
3.What payment methods are accepted for BZX384-B68F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BZX384-B68F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BZX384-B68F?
BZX384-B68F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BZX384-B68F 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-B68F?
For technical support, including BZX384-B68F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BZX384-B68F requirements.
6.How does Aetrix verify that BZX384-B68F is sourced from the original manufacturer or authorized distributors?
All BZX384-B68F 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-B68F meets industry standards.
7.What is the process for return or replacement of BZX384-B68F?
All BZX384-B68F units undergo pre-shipment inspection (PSI). If there is an issue with BZX384-B68F, 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-B68F part is unused and in its original packaging.
Return procedure for BZX384-B68F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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